chore(release): v0.1.7

include_str! embeds google-credentials.json at compile time, but the
file is gitignored, so CI checkouts had no file and the Rust crate
failed to compile on all three platforms. Write it from the
GOOGLE_CREDENTIALS secret, falling back to the committed example
placeholders so the build always succeeds.

.github/workflows/release.yml

@@ -19,7 +19,7 @@ jobs:
       tag: ${{ steps.version.outputs.tag }}
       release_id: ${{ steps.release.outputs.release_id }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
 
       - name: Determine version
         id: version
@@ -53,8 +53,20 @@ jobs:
           git config user.email "github-actions[bot]@users.noreply.github.com"
           git add src-tauri/tauri.conf.json package.json src-tauri/Cargo.toml
           git commit -m "chore(release): $TAG"
+          for attempt in 1 2 3 4 5; do
+            git fetch origin main
+            git rebase origin/main
+            if git push origin HEAD; then
+              break
+            fi
+            if [ "$attempt" = "5" ]; then
+              echo "::error::main kept advancing; could not push release bump after 5 attempts."
+              exit 1
+            fi
+            echo "main advanced during release; rebasing and retrying ($attempt)…"
+            sleep 3
+          done
           git tag "$TAG"
-          git push origin HEAD
           git push origin "$TAG"
 
       - name: Create draft release
@@ -71,7 +83,6 @@ jobs:
     needs: prepare
     strategy:
       fail-fast: false
-      max-parallel: 1
       matrix:
         include:
           - os: macos-latest
@@ -85,7 +96,7 @@ jobs:
             rust-targets: ""
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
         with:
           ref: ${{ needs.prepare.outputs.tag }}
 
@@ -106,11 +117,11 @@ jobs:
             file \
             rpm
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
-          node-version: 20
+          node-version: 26
 
-      - uses: pnpm/action-setup@v4
+      - uses: pnpm/action-setup@v6
         with:
           version: 10
 
@@ -126,6 +137,19 @@ jobs:
       - name: Install frontend dependencies
         run: pnpm install --frozen-lockfile
 
+      - name: Provision Google credentials
+        shell: bash
+        env:
+          GOOGLE_CREDENTIALS: ${{ secrets.GOOGLE_CREDENTIALS }}
+        run: |
+          if [ -n "$GOOGLE_CREDENTIALS" ]; then
+            printf '%s' "$GOOGLE_CREDENTIALS" > google-credentials.json
+            echo "Wrote google-credentials.json from GOOGLE_CREDENTIALS secret."
+          else
+            cp google-credentials.example.json google-credentials.json
+            echo "::warning::GOOGLE_CREDENTIALS secret not set — embedding placeholder credentials; Google Drive backup will be disabled in this release."
+          fi
+
       - name: Build and upload
         uses: tauri-apps/tauri-action@v0
         env:
@@ -140,9 +164,19 @@ jobs:
     needs: [prepare, build]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - name: Verify manifest is complete, then publish
-      - name: Publish release
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          REPO: ${{ github.repository }}
           TAG: ${{ needs.prepare.outputs.tag }}
-        run: gh release edit "$TAG" --draft=false --latest
+        run: |
+          gh release download "$TAG" --repo "$REPO" --pattern latest.json --output latest.json --clobber
+          echo "Platforms in latest.json:"
+          jq '.platforms | keys' latest.json
+          for key in darwin-aarch64 darwin-x86_64 linux-x86_64 windows-x86_64; do
+            if ! jq -e ".platforms[\"$key\"].url" latest.json > /dev/null; then
+              echo "::error::latest.json is missing platform '$key' — refusing to publish a partial update manifest. Re-run the release."
+              exit 1
+            fi
+          done
+          gh release edit "$TAG" --repo "$REPO" --draft=false --latest

.gitignore

@@ -26,6 +26,10 @@ dist-ssr
 # Tauri build output
 src-tauri/target/
 
+# Google OAuth desktop client (real values, never commit)
+/google-credentials.json
+/client_secret_*.json
+
 # Screenshots & Playwright MCP artifacts
 .playwright-mcp/
 /*.png

CLAUDE.md

@@ -10,7 +10,7 @@
 
 ## Git Commit Rules
 
+  - Do not make branches, commit in main only
   - Use conventional commit format: `feat|fix|refactor|docs|test|chore|ci(scope): message`
   - Never use `git add .` or `git add -A`. Always stage specific files by name.
   - Don't batch multiple unrelated changes into one commit.
-  - Commit early and often. A working 5-line change is better than a pending 200-line change.

README.md

@@ -1,37 +1,3 @@
 # margin
 
-An offline desktop app for writing books and exporting them to print-ready PDF and reflowable EPUB — a focused, free alternative to InDesign for text-first books (novels, non-fiction).
+Write your book. Own every word. A calm, offline studio to write, format, and publish your book to every store and to print.
-
-## Stack
-
-- **Tauri 2** (Rust shell) — offline by construction; the entire export pipeline runs locally, nothing hits the network.
-- **React + TipTap** — the semantic writing surface.
-- **Typst** (embedded as a Rust crate) — print-ready PDF with real book typography.
-- **Built-in EPUB3** generator + zip packager.
-
-One semantic document feeds three renderers — the editor, the PDF, and the EPUB — from a single design-token theme (**Quiet Press**: Literata for the page, Hanken Grotesk for the chrome). Both fonts are bundled.
-
-## Develop
-
-```sh
-pnpm install
-pnpm tauri dev     # the real desktop app: live PDF dock, file dialogs, PDF/EPUB export
-pnpm dev           # browser-only UI preview (Tauri APIs are inert)
-```
-
-The first `tauri dev` build is slow because it compiles Typst.
-
-## Using it
-
-- A book saves as a single `.margin` file (JSON). Open / Save with ⌘O / ⌘S.
-- Click the title in the top bar for **Book setup** (title, author, ISBN, trim size, language).
-- Insert images from the toolbar and choose a placement (inline / full-width / full-page / float).
-- Export to **PDF** or **EPUB** from the titlebar menu.
-
-## Layout
-
-- `src/editor/` — TipTap editor, extensions, figure block, floating toolbar.
-- `src/components/` — app shell, preview dock, book-setup panel, pdf.js renderer.
-- `src/export/` — `typst.ts` (book → Typst source), `epub.ts` (book → EPUB3 files), `exporters.ts`.
-- `src/store/`, `src/model/` — document model and state.
-- `src-tauri/src/` — `pdf.rs` (Typst compile), `epub.rs` (zip packager), `project.rs` (file IO).

google-credentials.example.json

@@ -0,0 +1,11 @@
+{
+  "installed": {
+    "client_id": "YOUR_CLIENT_ID.apps.googleusercontent.com",
+    "project_id": "your-project-id",
+    "auth_uri": "https://accounts.google.com/o/oauth2/auth",
+    "token_uri": "https://oauth2.googleapis.com/token",
+    "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
+    "client_secret": "YOUR_CLIENT_SECRET",
+    "redirect_uris": ["http://127.0.0.1"]
+  }
+}

package.json

@@ -1,7 +1,7 @@
 {
   "name": "margin-app",
   "private": true,
-  "version": "0.1.1",
+  "version": "0.1.7",
   "type": "module",
   "scripts": {
     "dev": "vite",

public/fonts/EBGaramond-OFL.txt

@@ -0,0 +1,93 @@
+Copyright 2017 The EB Garamond Project Authors (https://github.com/octaviopardo/EBGaramond12)
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+https://openfontlicense.org
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

public/fonts/Fraunces-OFL.txt

@@ -0,0 +1,93 @@
+Copyright 2018 The Fraunces Project Authors (https://github.com/undercasetype/Fraunces)
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+http://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

public/fonts/Lora-OFL.txt

@@ -0,0 +1,93 @@
+Copyright 2011 The Lora Project Authors (https://github.com/cyrealtype/Lora-Cyrillic), with Reserved Font Name "Lora".
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+https://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

public/fonts/SourceSerif4-OFL.txt

@@ -0,0 +1,93 @@
+Copyright 2014 The Source Serif 4 Project Authors (https://github.com/adobe-fonts/source-serif)
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+https://openfontlicense.org
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

src-tauri/Cargo.lock

@@ -3089,8 +3089,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ff2abc00be7fca6ebc474524697ae276ad847ad0a6b3faa4bcb027e9a4614ad0"
 dependencies = [
  "cfg-if",
+ "js-sys",
  "libc",
  "wasi",
+ "wasm-bindgen",
 ]
 
 [[package]]
@@ -3754,6 +3756,7 @@ dependencies = [
  "tokio",
  "tokio-rustls",
  "tower-service",
+ "webpki-roots",
 ]
 
 [[package]]
@@ -4632,6 +4635,12 @@ dependencies = [
  "hashbrown 0.17.1",
 ]
 
+[[package]]
+name = "lru-slab"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "112b39cec0b298b6c1999fee3e31427f74f676e4cb9879ed1a121b43661a4154"
+
 [[package]]
 name = "lzma-rs"
 version = "0.3.0"
@@ -4704,12 +4713,16 @@ checksum = "3e2e65a1a2e43cfcb47a895c4c8b10d1f4a61097f9f254f183aee60cad9c651d"
 
 [[package]]
 name = "margin-app"
-version = "0.1.0"
+version = "0.1.5"
 dependencies = [
  "base64 0.22.1",
+ "fontdb",
  "harper-core",
+ "rand 0.8.6",
+ "reqwest 0.12.28",
  "serde",
  "serde_json",
+ "sha2",
  "spellbook",
  "tauri",
  "tauri-build",
@@ -4720,6 +4733,7 @@ dependencies = [
  "typst",
  "typst-as-lib",
  "typst-pdf",
+ "url",
  "zip 2.4.2",
 ]
 
@@ -5966,6 +5980,61 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "quinn"
+version = "0.11.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c1a41e437b6bbd489372cd4971de128e85c855f56c57f283d20ff016cf7c0a8"
+dependencies = [
+ "bytes",
+ "cfg_aliases",
+ "pin-project-lite",
+ "quinn-proto",
+ "quinn-udp",
+ "rustc-hash 2.1.2",
+ "rustls",
+ "socket2",
+ "thiserror 2.0.18",
+ "tokio",
+ "tracing",
+ "web-time",
+]
+
+[[package]]
+name = "quinn-proto"
+version = "0.11.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4fcb935c5bec503c2f0e306bdd3e58bb9029dcb14fa8d9ac76e3a5256ac0763e"
+dependencies = [
+ "bytes",
+ "getrandom 0.3.4",
+ "lru-slab",
+ "rand 0.9.4",
+ "ring",
+ "rustc-hash 2.1.2",
+ "rustls",
+ "rustls-pki-types",
+ "slab",
+ "thiserror 2.0.18",
+ "tinyvec",
+ "tracing",
+ "web-time",
+]
+
+[[package]]
+name = "quinn-udp"
+version = "0.5.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "addec6a0dcad8a8d96a771f815f0eaf55f9d1805756410b39f5fa81332574cbd"
+dependencies = [
+ "cfg_aliases",
+ "libc",
+ "once_cell",
+ "socket2",
+ "tracing",
+ "windows-sys 0.60.2",
+]
+
 [[package]]
 name = "quote"
 version = "1.0.45"
@@ -5993,6 +6062,8 @@ version = "0.8.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5ca0ecfa931c29007047d1bc58e623ab12e5590e8c7cc53200d5202b69266d8a"
 dependencies = [
+ "libc",
+ "rand_chacha 0.3.1",
  "rand_core 0.6.4",
  "serde",
 ]
@@ -6033,6 +6104,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
+ "getrandom 0.2.17",
  "serde",
 ]
 
@@ -6203,6 +6275,44 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "19b30a45b0cd0bcca8037f3d0dc3421eaf95327a17cad11964fb8179b4fc4832"
 
+[[package]]
+name = "reqwest"
+version = "0.12.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eddd3ca559203180a307f12d114c268abf583f59b03cb906fd0b3ff8646c1147"
+dependencies = [
+ "base64 0.22.1",
+ "bytes",
+ "futures-core",
+ "http",
+ "http-body",
+ "http-body-util",
+ "hyper",
+ "hyper-rustls",
+ "hyper-util",
+ "js-sys",
+ "log",
+ "percent-encoding",
+ "pin-project-lite",
+ "quinn",
+ "rustls",
+ "rustls-pki-types",
+ "serde",
+ "serde_json",
+ "serde_urlencoded",
+ "sync_wrapper",
+ "tokio",
+ "tokio-rustls",
+ "tower",
+ "tower-http",
+ "tower-service",
+ "url",
+ "wasm-bindgen",
+ "wasm-bindgen-futures",
+ "web-sys",
+ "webpki-roots",
+]
+
 [[package]]
 name = "reqwest"
 version = "0.13.4"
@@ -6425,6 +6535,7 @@ version = "1.14.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "30a7197ae7eb376e574fe940d068c30fe0462554a3ddbe4eca7838e049c937a9"
 dependencies = [
+ "web-time",
  "zeroize",
 ]
 
@@ -6773,6 +6884,18 @@ dependencies = [
  "serde_core",
 ]
 
+[[package]]
+name = "serde_urlencoded"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3491c14715ca2294c4d6a88f15e84739788c1d030eed8c110436aafdaa2f3fd"
+dependencies = [
+ "form_urlencoded",
+ "itoa",
+ "ryu",
+ "serde",
+]
+
 [[package]]
 name = "serde_with"
 version = "3.21.0"
@@ -7421,7 +7544,7 @@ dependencies = [
  "percent-encoding",
  "plist",
  "raw-window-handle",
- "reqwest",
+ "reqwest 0.13.4",
  "serde",
  "serde_json",
  "serde_repr",
@@ -7610,7 +7733,7 @@ dependencies = [
  "minisign-verify",
  "osakit",
  "percent-encoding",
- "reqwest",
+ "reqwest 0.13.4",
  "rustls",
  "semver",
  "serde",
@@ -9149,6 +9272,15 @@ dependencies = [
  "rustls-pki-types",
 ]
 
+[[package]]
+name = "webpki-roots"
+version = "1.0.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bf85cb06032201fa7c6f829d7db5a7e5aa45bcc0655327713065f6f0576731bf"
+dependencies = [
+ "rustls-pki-types",
+]
+
 [[package]]
 name = "webview2-com"
 version = "0.38.2"

src-tauri/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "margin-app"
-version = "0.1.1"
+version = "0.1.7"
 description = "A Tauri App"
 authors = ["you"]
 edition = "2021"
@@ -27,6 +27,7 @@ serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 base64 = "0.22"
 zip = "2"
+fontdb = "0.23"
 typst = "0.14.2"
 typst-pdf = "0.14.2"
 typst-as-lib = "0.15.5"
@@ -35,6 +36,10 @@ spellbook = "0.4"
 # bump could silently invalidate the patch ("unused") and pull the broken CUDA subtree back in,
 # so bump deliberately and re-audit the stubs. (see [patch.crates-io])
 harper-core = { version = "=2.5.0", features = ["concurrent"] }
+reqwest = { version = "0.12", default-features = false, features = ["rustls-tls", "json"] }
+sha2 = "0.10"
+rand = "0.8"
+url = "2"
 
 # harper-core transitively declares an optional, disabled `burn-cuda` (CUDA backend).
 # Cargo still version-resolves that dead subtree, which currently fails (broken tracel-llvm

src-tauri/capabilities/default.json

@@ -5,6 +5,7 @@
   "windows": ["main"],
   "permissions": [
     "core:default",
+    "core:window:allow-destroy",
     "opener:default",
     "dialog:default",
     "updater:default",

src-tauri/src/epub.rs

@@ -5,9 +5,6 @@ use std::io::{Read, Write};
 use zip::write::SimpleFileOptions;
 use zip::{CompressionMethod, ZipArchive, ZipWriter};
 
-static LITERATA: &[u8] = include_bytes!("../../public/fonts/Literata-VF.ttf");
-static LITERATA_ITALIC: &[u8] = include_bytes!("../../public/fonts/Literata-Italic-VF.ttf");
-
 #[derive(Deserialize, Serialize)]
 pub struct EpubFile {
     path: String,
@@ -48,14 +45,6 @@ fn build(files: &[EpubFile]) -> Result<Vec<u8>, String> {
         zip.write_all(&bytes).map_err(|e| e.to_string())?;
     }
 
-    for (path, bytes) in [
-        ("OEBPS/fonts/Literata-VF.ttf", LITERATA),
-        ("OEBPS/fonts/Literata-Italic-VF.ttf", LITERATA_ITALIC),
-    ] {
-        zip.start_file(path, deflated).map_err(|e| e.to_string())?;
-        zip.write_all(bytes).map_err(|e| e.to_string())?;
-    }
-
     Ok(zip.finish().map_err(|e| e.to_string())?.into_inner())
 }
 

src-tauri/src/fonts.rs

@@ -0,0 +1,47 @@
+use fontdb::{Database, Family, Query};
+
+fn system_db() -> Database {
+    let mut db = Database::new();
+    db.load_system_fonts();
+    db
+}
+
+#[tauri::command(async)]
+pub fn list_system_fonts() -> Vec<String> {
+    let db = system_db();
+    let mut names: Vec<String> = db
+        .faces()
+        .filter_map(|face| face.families.first().map(|(name, _)| name.clone()))
+        .collect();
+    names.sort();
+    names.dedup();
+    names
+}
+
+pub fn system_font_bytes(family: &str) -> Vec<Vec<u8>> {
+    let db = system_db();
+    let mut out = Vec::new();
+    let styles = [
+        (fontdb::Weight::NORMAL, fontdb::Style::Normal),
+        (fontdb::Weight::NORMAL, fontdb::Style::Italic),
+        (fontdb::Weight::BOLD, fontdb::Style::Normal),
+        (fontdb::Weight::BOLD, fontdb::Style::Italic),
+    ];
+    let mut seen = std::collections::HashSet::new();
+    for (weight, style) in styles {
+        let query = Query {
+            families: &[Family::Name(family)],
+            weight,
+            style,
+            ..Query::default()
+        };
+        if let Some(id) = db.query(&query) {
+            if seen.insert(id) {
+                if let Some(bytes) = db.with_face_data(id, |data, _index| data.to_vec()) {
+                    out.push(bytes);
+                }
+            }
+        }
+    }
+    out
+}

src-tauri/src/gdrive.rs

@@ -0,0 +1,806 @@
+use base64::Engine;
+use base64::engine::general_purpose::URL_SAFE_NO_PAD;
+use rand::RngCore;
+use serde::de::DeserializeOwned;
+use serde::{Deserialize, Serialize};
+use sha2::{Digest, Sha256};
+use std::collections::HashMap;
+use std::fs;
+use std::io::{Read, Write};
+use std::net::{TcpListener, TcpStream};
+use std::path::PathBuf;
+use std::sync::{LazyLock, Mutex};
+use std::time::{Duration, Instant, SystemTime, UNIX_EPOCH};
+use tauri::{Emitter, Manager};
+
+const FOLDER_NAME: &str = "margin";
+const DICTIONARY_NAME: &str = "custom-dictionary.txt";
+const SCOPES: &str = "openid email https://www.googleapis.com/auth/drive.file";
+const AUTH_TIMEOUT_SECS: u64 = 120;
+
+const CREDENTIALS_JSON: &str =
+    include_str!(concat!(env!("CARGO_MANIFEST_DIR"), "/../google-credentials.json"));
+
+static HTTP: LazyLock<reqwest::Client> = LazyLock::new(reqwest::Client::new);
+
+#[derive(Deserialize)]
+struct CredentialsFile {
+    installed: Credentials,
+}
+
+#[derive(Deserialize)]
+struct Credentials {
+    client_id: String,
+    client_secret: String,
+    auth_uri: String,
+    token_uri: String,
+}
+
+fn load_credentials() -> Result<Credentials, String> {
+    let runtime_path = concat!(env!("CARGO_MANIFEST_DIR"), "/../google-credentials.json");
+    let raw = fs::read_to_string(runtime_path).unwrap_or_else(|_| CREDENTIALS_JSON.to_string());
+    let parsed: CredentialsFile = serde_json::from_str(&raw)
+        .map_err(|e| format!("invalid google-credentials.json: {e}"))?;
+    let creds = parsed.installed;
+    if creds.client_id.starts_with("YOUR_CLIENT_ID") || creds.client_secret.starts_with("YOUR_CLIENT_SECRET") {
+        return Err("Google Drive is not set up yet. Add a real OAuth desktop client to google-credentials.json.".to_string());
+    }
+    Ok(creds)
+}
+
+#[derive(Default)]
+pub struct GDriveState(pub Mutex<Session>);
+
+#[derive(Default)]
+pub struct Session {
+    refresh_token: Option<String>,
+    access_token: Option<String>,
+    access_expiry: u64,
+    email: Option<String>,
+    folder_id: Option<String>,
+}
+
+#[derive(Serialize, Deserialize, Default)]
+struct BackupState {
+    #[serde(default)]
+    refresh_token: Option<String>,
+    email: Option<String>,
+    folder_id: Option<String>,
+    last_backup: Option<u64>,
+    #[serde(default)]
+    files: HashMap<String, FileRecord>,
+}
+
+#[derive(Serialize, Deserialize, Clone)]
+struct FileRecord {
+    hash: String,
+    drive_id: String,
+}
+
+#[derive(Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct Status {
+    connected: bool,
+    email: Option<String>,
+    last_backup: Option<u64>,
+    pending: bool,
+}
+
+#[derive(Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct RestoreResult {
+    restored: usize,
+}
+
+#[derive(Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct BackupOutcome {
+    uploaded: usize,
+    #[serde(flatten)]
+    status: Status,
+}
+
+#[derive(Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct RemoteBackup {
+    name: String,
+}
+
+#[derive(Clone, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct AuthEvent {
+    ok: bool,
+    error: Option<String>,
+}
+
+fn now() -> u64 {
+    SystemTime::now().duration_since(UNIX_EPOCH).unwrap_or_default().as_secs()
+}
+
+fn dictionary_path(app: &tauri::AppHandle) -> Result<PathBuf, String> {
+    Ok(crate::library::app_data_dir(app)?.join(DICTIONARY_NAME))
+}
+
+fn state_path(app: &tauri::AppHandle) -> Result<PathBuf, String> {
+    Ok(crate::library::app_data_dir(app)?.join("backup.json"))
+}
+
+fn load_state(app: &tauri::AppHandle) -> BackupState {
+    let path = match state_path(app) {
+        Ok(p) => p,
+        Err(_) => return BackupState::default(),
+    };
+    match fs::read_to_string(&path) {
+        Ok(contents) => serde_json::from_str(&contents).unwrap_or_default(),
+        Err(_) => BackupState::default(),
+    }
+}
+
+fn save_state(app: &tauri::AppHandle, state: &BackupState) -> Result<(), String> {
+    let path = state_path(app)?;
+    let contents = serde_json::to_string_pretty(state).map_err(|e| e.to_string())?;
+    crate::project::atomic_write(&path, contents.as_bytes(), false)
+}
+
+fn random_b64(bytes: usize) -> String {
+    let mut buf = vec![0u8; bytes];
+    rand::thread_rng().fill_bytes(&mut buf);
+    URL_SAFE_NO_PAD.encode(buf)
+}
+
+fn pkce_challenge(verifier: &str) -> String {
+    let mut hasher = Sha256::new();
+    hasher.update(verifier.as_bytes());
+    URL_SAFE_NO_PAD.encode(hasher.finalize())
+}
+
+fn hash_bytes(bytes: &[u8]) -> String {
+    let mut hasher = Sha256::new();
+    hasher.update(bytes);
+    format!("{:x}", hasher.finalize())
+}
+
+fn urlencode(s: &str) -> String {
+    url::form_urlencoded::byte_serialize(s.as_bytes()).collect()
+}
+
+fn drive_escape(s: &str) -> String {
+    s.replace('\\', "\\\\").replace('\'', "\\'")
+}
+
+fn safe_book_name(name: &str) -> bool {
+    match name.strip_suffix(".margin") {
+        Some(stem) => !stem.is_empty() && stem.chars().all(|c| c.is_ascii_alphanumeric() || c == '-' || c == '_'),
+        None => false,
+    }
+}
+
+fn write_http_message(stream: &mut TcpStream, message: &str) {
+    let body = format!(
+        "<!doctype html><html><head><meta charset=\"utf-8\"><title>margin</title></head>\
+         <body style=\"font-family:system-ui,sans-serif;text-align:center;padding-top:80px;color:#222\">\
+         <h2>{message}</h2></body></html>"
+    );
+    let response = format!(
+        "HTTP/1.1 200 OK\r\nContent-Type: text/html; charset=utf-8\r\nContent-Length: {}\r\nConnection: close\r\n\r\n{}",
+        body.len(),
+        body
+    );
+    let _ = stream.write_all(response.as_bytes());
+    let _ = stream.flush();
+}
+
+fn await_code(listener: TcpListener, expected_state: &str, deadline: Instant) -> Result<String, String> {
+    listener.set_nonblocking(true).map_err(|e| e.to_string())?;
+    loop {
+        if Instant::now() > deadline {
+            return Err("Timed out waiting for Google authorization.".to_string());
+        }
+        match listener.accept() {
+            Ok((mut stream, _)) => {
+                stream.set_nonblocking(false).ok();
+                stream.set_read_timeout(Some(Duration::from_secs(5))).ok();
+                let mut buf = [0u8; 8192];
+                let n = stream.read(&mut buf).unwrap_or(0);
+                let request = String::from_utf8_lossy(&buf[..n]);
+                let path = request.lines().next().and_then(|line| line.split_whitespace().nth(1)).unwrap_or("");
+                if path == "/favicon.ico" {
+                    write_http_message(&mut stream, "margin");
+                    continue;
+                }
+                let full = format!("http://127.0.0.1{path}");
+                let parsed = match url::Url::parse(&full) {
+                    Ok(p) => p,
+                    Err(_) => {
+                        write_http_message(&mut stream, "Waiting for Google…");
+                        continue;
+                    }
+                };
+                let mut code = None;
+                let mut state = None;
+                let mut error = None;
+                for (key, value) in parsed.query_pairs() {
+                    match key.as_ref() {
+                        "code" => code = Some(value.into_owned()),
+                        "state" => state = Some(value.into_owned()),
+                        "error" => error = Some(value.into_owned()),
+                        _ => {}
+                    }
+                }
+                if let Some(error) = error {
+                    write_http_message(&mut stream, "Authorization was cancelled. You can close this tab.");
+                    return Err(format!("Google authorization failed: {error}"));
+                }
+                match (code, state) {
+                    (Some(code), Some(state)) if state == expected_state => {
+                        write_http_message(&mut stream, "Connected to margin. You can close this tab.");
+                        return Ok(code);
+                    }
+                    (Some(_), _) => {
+                        write_http_message(&mut stream, "Could not verify the request. You can close this tab.");
+                        return Err("State mismatch during Google authorization.".to_string());
+                    }
+                    _ => {
+                        write_http_message(&mut stream, "Waiting for Google…");
+                    }
+                }
+            }
+            Err(ref e) if e.kind() == std::io::ErrorKind::WouldBlock => {
+                std::thread::sleep(Duration::from_millis(150));
+            }
+            Err(e) => return Err(e.to_string()),
+        }
+    }
+}
+
+#[derive(Deserialize)]
+struct TokenResponse {
+    access_token: String,
+    #[serde(default)]
+    refresh_token: Option<String>,
+    #[serde(default)]
+    expires_in: u64,
+}
+
+#[derive(Deserialize)]
+struct UserInfo {
+    #[serde(default)]
+    email: Option<String>,
+}
+
+#[derive(Deserialize)]
+struct DriveFile {
+    id: String,
+    #[serde(default)]
+    name: String,
+}
+
+#[derive(Deserialize)]
+struct FileList {
+    #[serde(default)]
+    files: Vec<DriveFile>,
+    #[serde(default, rename = "nextPageToken")]
+    next_page_token: Option<String>,
+}
+
+async fn read_json<T: DeserializeOwned>(resp: reqwest::Response, context: &str) -> Result<T, String> {
+    let status = resp.status();
+    let text = resp.text().await.map_err(|e| e.to_string())?;
+    if !status.is_success() {
+        return Err(format!("{context} failed ({status}): {text}"));
+    }
+    serde_json::from_str(&text).map_err(|e| format!("{context}: could not parse response: {e}"))
+}
+
+async fn exchange_code(creds: &Credentials, code: &str, redirect: &str, verifier: &str) -> Result<TokenResponse, String> {
+    let resp = HTTP
+        .post(&creds.token_uri)
+        .form(&[
+            ("client_id", creds.client_id.as_str()),
+            ("client_secret", creds.client_secret.as_str()),
+            ("code", code),
+            ("code_verifier", verifier),
+            ("grant_type", "authorization_code"),
+            ("redirect_uri", redirect),
+        ])
+        .send()
+        .await
+        .map_err(|e| e.to_string())?;
+    read_json(resp, "Google token exchange").await
+}
+
+async fn refresh_access_token(creds: &Credentials, refresh_token: &str) -> Result<TokenResponse, String> {
+    let resp = HTTP
+        .post(&creds.token_uri)
+        .form(&[
+            ("client_id", creds.client_id.as_str()),
+            ("client_secret", creds.client_secret.as_str()),
+            ("refresh_token", refresh_token),
+            ("grant_type", "refresh_token"),
+        ])
+        .send()
+        .await
+        .map_err(|e| e.to_string())?;
+    read_json(resp, "Google token refresh").await
+}
+
+async fn fetch_email(access_token: &str) -> Result<String, String> {
+    let resp = HTTP
+        .get("https://www.googleapis.com/oauth2/v2/userinfo")
+        .bearer_auth(access_token)
+        .send()
+        .await
+        .map_err(|e| e.to_string())?;
+    let info: UserInfo = read_json(resp, "Google account lookup").await?;
+    Ok(info.email.unwrap_or_default())
+}
+
+async fn ensure_folder(access_token: &str) -> Result<String, String> {
+    let query = format!(
+        "name = '{}' and mimeType = 'application/vnd.google-apps.folder' and trashed = false",
+        drive_escape(FOLDER_NAME)
+    );
+    let resp = HTTP
+        .get("https://www.googleapis.com/drive/v3/files")
+        .bearer_auth(access_token)
+        .query(&[
+            ("q", query.as_str()),
+            ("fields", "files(id,name)"),
+            ("spaces", "drive"),
+            ("pageSize", "1"),
+        ])
+        .send()
+        .await
+        .map_err(|e| e.to_string())?;
+    let list: FileList = read_json(resp, "Drive folder lookup").await?;
+    if let Some(folder) = list.files.into_iter().next() {
+        return Ok(folder.id);
+    }
+    let body = serde_json::json!({
+        "name": FOLDER_NAME,
+        "mimeType": "application/vnd.google-apps.folder",
+    });
+    let resp = HTTP
+        .post("https://www.googleapis.com/drive/v3/files")
+        .bearer_auth(access_token)
+        .query(&[("fields", "id")])
+        .json(&body)
+        .send()
+        .await
+        .map_err(|e| e.to_string())?;
+    let created: DriveFile = read_json(resp, "Drive folder creation").await?;
+    Ok(created.id)
+}
+
+async fn find_file(access_token: &str, folder_id: &str, name: &str) -> Result<Option<DriveFile>, String> {
+    let query = format!(
+        "'{}' in parents and name = '{}' and trashed = false",
+        drive_escape(folder_id),
+        drive_escape(name)
+    );
+    let resp = HTTP
+        .get("https://www.googleapis.com/drive/v3/files")
+        .bearer_auth(access_token)
+        .query(&[
+            ("q", query.as_str()),
+            ("fields", "files(id,name)"),
+            ("spaces", "drive"),
+            ("pageSize", "1"),
+        ])
+        .send()
+        .await
+        .map_err(|e| e.to_string())?;
+    let list: FileList = read_json(resp, "Drive file lookup").await?;
+    Ok(list.files.into_iter().next())
+}
+
+async fn list_in_folder(access_token: &str, folder_id: &str) -> Result<Vec<DriveFile>, String> {
+    let query = format!("'{}' in parents and trashed = false", drive_escape(folder_id));
+    let mut files = Vec::new();
+    let mut page_token: Option<String> = None;
+    loop {
+        let mut request = HTTP
+            .get("https://www.googleapis.com/drive/v3/files")
+            .bearer_auth(access_token)
+            .query(&[
+                ("q", query.as_str()),
+                ("fields", "nextPageToken,files(id,name)"),
+                ("spaces", "drive"),
+                ("pageSize", "100"),
+            ]);
+        if let Some(token) = &page_token {
+            request = request.query(&[("pageToken", token.as_str())]);
+        }
+        let resp = request.send().await.map_err(|e| e.to_string())?;
+        let FileList { files: page, next_page_token } = read_json(resp, "Drive file list").await?;
+        files.extend(page);
+        match next_page_token {
+            Some(token) => page_token = Some(token),
+            None => break,
+        }
+    }
+    Ok(files)
+}
+
+async fn upload_file(
+    access_token: &str,
+    folder_id: &str,
+    name: &str,
+    bytes: &[u8],
+    existing_id: Option<String>,
+) -> Result<DriveFile, String> {
+    let boundary = "margin7f3e2a1b9c8d";
+    let metadata = match &existing_id {
+        Some(_) => serde_json::json!({ "name": name }),
+        None => serde_json::json!({ "name": name, "parents": [folder_id] }),
+    };
+    let mut body: Vec<u8> = Vec::new();
+    body.extend_from_slice(format!("--{boundary}\r\nContent-Type: application/json; charset=UTF-8\r\n\r\n").as_bytes());
+    body.extend_from_slice(serde_json::to_string(&metadata).unwrap_or_default().as_bytes());
+    body.extend_from_slice(format!("\r\n--{boundary}\r\nContent-Type: application/octet-stream\r\n\r\n").as_bytes());
+    body.extend_from_slice(bytes);
+    body.extend_from_slice(format!("\r\n--{boundary}--\r\n").as_bytes());
+
+    let request = match &existing_id {
+        Some(id) => HTTP.patch(format!("https://www.googleapis.com/upload/drive/v3/files/{id}")),
+        None => HTTP.post("https://www.googleapis.com/upload/drive/v3/files"),
+    };
+    let resp = request
+        .bearer_auth(access_token)
+        .query(&[("uploadType", "multipart"), ("fields", "id")])
+        .header(reqwest::header::CONTENT_TYPE, format!("multipart/related; boundary={boundary}"))
+        .body(body)
+        .send()
+        .await
+        .map_err(|e| e.to_string())?;
+    read_json(resp, &format!("Drive upload of {name}")).await
+}
+
+async fn download_file(access_token: &str, id: &str) -> Result<Vec<u8>, String> {
+    let resp = HTTP
+        .get(format!("https://www.googleapis.com/drive/v3/files/{id}"))
+        .bearer_auth(access_token)
+        .query(&[("alt", "media")])
+        .send()
+        .await
+        .map_err(|e| e.to_string())?;
+    let status = resp.status();
+    if !status.is_success() {
+        let text = resp.text().await.unwrap_or_default();
+        return Err(format!("Drive download failed ({status}): {text}"));
+    }
+    Ok(resp.bytes().await.map_err(|e| e.to_string())?.to_vec())
+}
+
+async fn valid_access_token(app: &tauri::AppHandle, state: &GDriveState) -> Result<String, String> {
+    let (access, expiry, refresh) = {
+        let session = state.0.lock().unwrap();
+        (session.access_token.clone(), session.access_expiry, session.refresh_token.clone())
+    };
+    if let Some(token) = access {
+        if now() < expiry {
+            return Ok(token);
+        }
+    }
+    let refresh = refresh.ok_or("Not connected to Google Drive.")?;
+    let creds = load_credentials()?;
+    let tokens = refresh_access_token(&creds, &refresh).await?;
+    let access_token = tokens.access_token.clone();
+    {
+        let mut session = state.0.lock().unwrap();
+        session.access_token = Some(tokens.access_token);
+        session.access_expiry = now() + tokens.expires_in.saturating_sub(60);
+        if let Some(rotated) = &tokens.refresh_token {
+            session.refresh_token = Some(rotated.clone());
+        }
+    }
+    if let Some(rotated) = &tokens.refresh_token {
+        let mut stored = load_state(app);
+        stored.refresh_token = Some(rotated.clone());
+        let _ = save_state(app, &stored);
+    }
+    Ok(access_token)
+}
+
+async fn ensure_folder_id(app: &tauri::AppHandle, state: &GDriveState, access_token: &str) -> Result<String, String> {
+    {
+        let session = state.0.lock().unwrap();
+        if let Some(folder) = &session.folder_id {
+            return Ok(folder.clone());
+        }
+    }
+    let folder_id = ensure_folder(access_token).await?;
+    {
+        let mut session = state.0.lock().unwrap();
+        session.folder_id = Some(folder_id.clone());
+    }
+    let mut stored = load_state(app);
+    stored.folder_id = Some(folder_id.clone());
+    save_state(app, &stored)?;
+    Ok(folder_id)
+}
+
+fn collect_local_files(app: &tauri::AppHandle) -> Result<Vec<(String, Vec<u8>)>, String> {
+    let mut files = Vec::new();
+    let library = crate::library::library_dir(app)?;
+    for entry in fs::read_dir(&library).map_err(|e| e.to_string())? {
+        let path = match entry {
+            Ok(entry) => entry.path(),
+            Err(_) => continue,
+        };
+        if path.extension().and_then(|e| e.to_str()) != Some("margin") {
+            continue;
+        }
+        let name = match path.file_name().and_then(|n| n.to_str()) {
+            Some(name) if safe_book_name(name) => name.to_string(),
+            _ => continue,
+        };
+        let bytes = fs::read(&path).map_err(|e| e.to_string())?;
+        files.push((name, bytes));
+    }
+    let dictionary = dictionary_path(app)?;
+    if dictionary.exists() {
+        let bytes = fs::read(&dictionary).map_err(|e| e.to_string())?;
+        files.push((DICTIONARY_NAME.to_string(), bytes));
+    }
+    Ok(files)
+}
+
+fn file_pending(path: &std::path::Path, name: &str, stored: &BackupState, last_backup: u64) -> bool {
+    let record = match stored.files.get(name) {
+        Some(record) => record,
+        None => return true,
+    };
+    let touched = fs::metadata(path)
+        .and_then(|meta| meta.modified())
+        .ok()
+        .and_then(|time| time.duration_since(UNIX_EPOCH).ok())
+        .map(|since| since.as_secs() > last_backup)
+        .unwrap_or(true);
+    if !touched {
+        return false;
+    }
+    match fs::read(path) {
+        Ok(bytes) => record.hash != hash_bytes(&bytes),
+        Err(_) => false,
+    }
+}
+
+fn compute_pending(app: &tauri::AppHandle, stored: &BackupState) -> bool {
+    let last_backup = stored.last_backup.unwrap_or(0);
+    let library = match crate::library::library_dir(app) {
+        Ok(dir) => dir,
+        Err(_) => return false,
+    };
+    if let Ok(entries) = fs::read_dir(&library) {
+        for entry in entries.flatten() {
+            let path = entry.path();
+            if path.extension().and_then(|e| e.to_str()) != Some("margin") {
+                continue;
+            }
+            if let Some(name) = path.file_name().and_then(|n| n.to_str()) {
+                if safe_book_name(name) && file_pending(&path, name, stored, last_backup) {
+                    return true;
+                }
+            }
+        }
+    }
+    match dictionary_path(app) {
+        Ok(dict) if dict.exists() => file_pending(&dict, DICTIONARY_NAME, stored, last_backup),
+        _ => false,
+    }
+}
+
+fn status_inner(app: &tauri::AppHandle, state: &GDriveState) -> Status {
+    let (connected, email) = {
+        let session = state.0.lock().unwrap();
+        (session.refresh_token.is_some(), session.email.clone())
+    };
+    let stored = load_state(app);
+    let pending = connected && compute_pending(app, &stored);
+    Status {
+        connected,
+        email: email.or(stored.email),
+        last_backup: stored.last_backup,
+        pending,
+    }
+}
+
+pub fn init_session(app: &tauri::AppHandle) {
+    let state = app.state::<GDriveState>();
+    let stored = load_state(app);
+    let mut session = state.0.lock().unwrap();
+    session.refresh_token = stored.refresh_token;
+    session.email = stored.email;
+    session.folder_id = stored.folder_id;
+}
+
+async fn complete_auth(
+    app: &tauri::AppHandle,
+    listener: TcpListener,
+    csrf: String,
+    verifier: String,
+    redirect: String,
+    creds: Credentials,
+) -> Result<(), String> {
+    let code = tauri::async_runtime::spawn_blocking(move || {
+        let deadline = Instant::now() + Duration::from_secs(AUTH_TIMEOUT_SECS);
+        await_code(listener, &csrf, deadline)
+    })
+    .await
+    .map_err(|e| e.to_string())??;
+
+    let tokens = exchange_code(&creds, &code, &redirect, &verifier).await?;
+    let email = fetch_email(&tokens.access_token).await?;
+    let folder_id = ensure_folder(&tokens.access_token).await?;
+
+    {
+        let state = app.state::<GDriveState>();
+        let mut session = state.0.lock().unwrap();
+        if let Some(refresh) = &tokens.refresh_token {
+            session.refresh_token = Some(refresh.clone());
+        }
+        session.access_token = Some(tokens.access_token.clone());
+        session.access_expiry = now() + tokens.expires_in.saturating_sub(60);
+        session.email = Some(email.clone());
+        session.folder_id = Some(folder_id.clone());
+    }
+
+    let mut stored = load_state(app);
+    if let Some(refresh) = &tokens.refresh_token {
+        stored.refresh_token = Some(refresh.clone());
+    }
+    stored.email = Some(email);
+    stored.folder_id = Some(folder_id);
+    save_state(app, &stored)?;
+    Ok(())
+}
+
+#[tauri::command]
+pub async fn gdrive_connect(app: tauri::AppHandle) -> Result<String, String> {
+    let creds = load_credentials()?;
+    let verifier = random_b64(64);
+    let challenge = pkce_challenge(&verifier);
+    let csrf = random_b64(24);
+
+    let listener = TcpListener::bind("127.0.0.1:0").map_err(|e| e.to_string())?;
+    let port = listener.local_addr().map_err(|e| e.to_string())?.port();
+    let redirect = format!("http://127.0.0.1:{port}");
+
+    let auth_url = format!(
+        "{}?client_id={}&redirect_uri={}&response_type=code&scope={}&code_challenge={}&code_challenge_method=S256&state={}&access_type=offline&prompt=consent",
+        creds.auth_uri,
+        urlencode(&creds.client_id),
+        urlencode(&redirect),
+        urlencode(SCOPES),
+        challenge,
+        urlencode(&csrf),
+    );
+
+    use tauri_plugin_opener::OpenerExt;
+    let _ = app.opener().open_url(auth_url.clone(), None::<&str>);
+
+    let app_bg = app.clone();
+    tauri::async_runtime::spawn(async move {
+        let event = match complete_auth(&app_bg, listener, csrf, verifier, redirect, creds).await {
+            Ok(()) => AuthEvent { ok: true, error: None },
+            Err(error) => AuthEvent { ok: false, error: Some(error) },
+        };
+        let _ = app_bg.emit("gdrive-auth", event);
+    });
+
+    Ok(auth_url)
+}
+
+#[tauri::command]
+pub async fn gdrive_disconnect(app: tauri::AppHandle, state: tauri::State<'_, GDriveState>) -> Result<Status, String> {
+    let refresh = {
+        let session = state.0.lock().unwrap();
+        session.refresh_token.clone()
+    };
+    if let Some(refresh) = refresh {
+        let _ = HTTP
+            .post("https://oauth2.googleapis.com/revoke")
+            .form(&[("token", refresh.as_str())])
+            .send()
+            .await;
+    }
+    {
+        let mut session = state.0.lock().unwrap();
+        session.refresh_token = None;
+        session.access_token = None;
+        session.access_expiry = 0;
+        session.email = None;
+    }
+    let mut stored = load_state(&app);
+    stored.refresh_token = None;
+    stored.email = None;
+    save_state(&app, &stored)?;
+    Ok(status_inner(&app, &state))
+}
+
+#[tauri::command]
+pub async fn gdrive_status(app: tauri::AppHandle, state: tauri::State<'_, GDriveState>) -> Result<Status, String> {
+    Ok(status_inner(&app, &state))
+}
+
+#[tauri::command]
+pub async fn gdrive_backup(app: tauri::AppHandle, state: tauri::State<'_, GDriveState>) -> Result<BackupOutcome, String> {
+    let access_token = valid_access_token(&app, &state).await?;
+    let folder_id = ensure_folder_id(&app, &state, &access_token).await?;
+    let files = collect_local_files(&app)?;
+    let mut stored = load_state(&app);
+    let mut uploaded = 0;
+    for (name, bytes) in &files {
+        let hash = hash_bytes(bytes);
+        let existing = stored.files.get(name).cloned();
+        if let Some(record) = &existing {
+            if record.hash == hash {
+                continue;
+            }
+        }
+        let drive_id = match &existing {
+            Some(record) => Some(record.drive_id.clone()),
+            None => find_file(&access_token, &folder_id, name).await?.map(|file| file.id),
+        };
+        let result = upload_file(&access_token, &folder_id, name, bytes, drive_id).await?;
+        stored.files.insert(name.clone(), FileRecord { hash, drive_id: result.id });
+        uploaded += 1;
+    }
+    if uploaded > 0 {
+        stored.last_backup = Some(now());
+        save_state(&app, &stored)?;
+    }
+    Ok(BackupOutcome {
+        uploaded,
+        status: Status {
+            connected: true,
+            email: stored.email.clone(),
+            last_backup: stored.last_backup,
+            pending: false,
+        },
+    })
+}
+
+#[tauri::command]
+pub async fn gdrive_restore(app: tauri::AppHandle, state: tauri::State<'_, GDriveState>) -> Result<RestoreResult, String> {
+    let access_token = valid_access_token(&app, &state).await?;
+    let folder_id = ensure_folder_id(&app, &state, &access_token).await?;
+    let remote = list_in_folder(&access_token, &folder_id).await?;
+    let mut stored = load_state(&app);
+    let mut restored = 0;
+    for file in &remote {
+        let is_dictionary = file.name == DICTIONARY_NAME;
+        let is_book = safe_book_name(&file.name);
+        if !is_dictionary && !is_book {
+            continue;
+        }
+        let bytes = download_file(&access_token, &file.id).await?;
+        let destination = if is_dictionary {
+            dictionary_path(&app)?
+        } else {
+            crate::library::library_dir(&app)?.join(&file.name)
+        };
+        crate::project::atomic_write(&destination, &bytes, false)?;
+        stored.files.insert(
+            file.name.clone(),
+            FileRecord { hash: hash_bytes(&bytes), drive_id: file.id.clone() },
+        );
+        restored += 1;
+    }
+    stored.last_backup = Some(now());
+    save_state(&app, &stored)?;
+    Ok(RestoreResult { restored })
+}
+
+#[tauri::command]
+pub async fn gdrive_list_backups(app: tauri::AppHandle, state: tauri::State<'_, GDriveState>) -> Result<Vec<RemoteBackup>, String> {
+    let access_token = valid_access_token(&app, &state).await?;
+    let folder_id = ensure_folder_id(&app, &state, &access_token).await?;
+    let remote = list_in_folder(&access_token, &folder_id).await?;
+    Ok(remote
+        .into_iter()
+        .filter(|file| safe_book_name(&file.name))
+        .map(|file| RemoteBackup { name: file.name })
+        .collect())
+}

src-tauri/src/lib.rs

@@ -1,4 +1,6 @@
 mod epub;
+mod fonts;
+mod gdrive;
 mod library;
 mod pdf;
 mod project;
@@ -58,12 +60,24 @@ fn build_menu<R: Runtime>(handle: &tauri::AppHandle<R>) -> tauri::Result<Menu<R>
 
 #[cfg_attr(mobile, tauri::mobile_entry_point)]
 pub fn run() {
-    tauri::Builder::default()
+    let context = tauri::generate_context!();
+
+    let mut builder = tauri::Builder::default()
         .plugin(tauri_plugin_opener::init())
         .plugin(tauri_plugin_dialog::init())
-        .plugin(tauri_plugin_updater::Builder::new().build())
+        .plugin(tauri_plugin_process::init());
-        .plugin(tauri_plugin_process::init())
+
+    if context.config().plugins.0.contains_key("updater") {
+        builder = builder.plugin(tauri_plugin_updater::Builder::new().build());
+    }
+
+    builder
         .manage(proofing::new_state())
+        .manage(gdrive::GDriveState::default())
+        .setup(|app| {
+            gdrive::init_session(app.handle());
+            Ok(())
+        })
         .menu(|handle| build_menu(handle))
         .on_menu_event(|app, event| {
             if matches!(
@@ -76,6 +90,7 @@ pub fn run() {
         .invoke_handler(tauri::generate_handler![
             epub::package_epub,
             epub::unzip_epub,
+            fonts::list_system_fonts,
             pdf::compile_pdf,
             project::read_file,
             project::write_file,
@@ -85,8 +100,14 @@ pub fn run() {
             library::save_book,
             library::delete_book,
             proofing::proof_text,
-            proofing::remember_word
+            proofing::remember_word,
+            gdrive::gdrive_connect,
+            gdrive::gdrive_disconnect,
+            gdrive::gdrive_status,
+            gdrive::gdrive_backup,
+            gdrive::gdrive_restore,
+            gdrive::gdrive_list_backups
         ])
-        .run(tauri::generate_context!())
+        .run(context)
         .expect("error while running margin");
 }

src-tauri/src/library.rs

@@ -7,18 +7,37 @@ pub struct BookSummary {
     id: String,
     title: String,
     author: String,
+    corrupt: bool,
 }
 
-fn library_dir(app: &tauri::AppHandle) -> Result<PathBuf, String> {
+fn corrupt_summary(stem: &str) -> BookSummary {
-    let dir = app
+    BookSummary {
-        .path()
+        id: stem.to_string(),
-        .app_data_dir()
+        title: "Unreadable book".to_string(),
-        .map_err(|e| e.to_string())?
+        author: String::new(),
-        .join("library");
+        corrupt: true,
+    }
+}
+
+pub(crate) fn app_data_dir(app: &tauri::AppHandle) -> Result<PathBuf, String> {
+    let dir = app.path().app_data_dir().map_err(|e| e.to_string())?;
     fs::create_dir_all(&dir).map_err(|e| e.to_string())?;
     Ok(dir)
 }
 
+pub(crate) fn library_dir(app: &tauri::AppHandle) -> Result<PathBuf, String> {
+    let dir = app_data_dir(app)?.join("library");
+    fs::create_dir_all(&dir).map_err(|e| e.to_string())?;
+    Ok(dir)
+}
+
+fn book_path(app: &tauri::AppHandle, id: &str) -> Result<PathBuf, String> {
+    if id.is_empty() || !id.chars().all(|c| c.is_ascii_alphanumeric() || c == '-' || c == '_') {
+        return Err("invalid book id".to_string());
+    }
+    Ok(library_dir(app)?.join(format!("{id}.margin")))
+}
+
 #[tauri::command]
 pub fn list_books(app: tauri::AppHandle) -> Result<Vec<BookSummary>, String> {
     let dir = library_dir(&app)?;
@@ -31,16 +50,24 @@ pub fn list_books(app: tauri::AppHandle) -> Result<Vec<BookSummary>, String> {
         if path.extension().and_then(|e| e.to_str()) != Some("margin") {
             continue;
         }
+        let stem = path.file_stem().and_then(|s| s.to_str()).unwrap_or("");
         let contents = match fs::read_to_string(&path) {
             Ok(contents) => contents,
-            Err(_) => continue,
+            Err(_) => {
+                books.push(corrupt_summary(stem));
+                continue;
+            }
         };
         let value: serde_json::Value = match serde_json::from_str(&contents) {
             Ok(value) => value,
-            Err(_) => continue,
+            Err(_) => {
+                books.push(corrupt_summary(stem));
+                continue;
+            }
         };
         let id = value.get("id").and_then(|v| v.as_str()).unwrap_or("");
         if id.is_empty() {
+            books.push(corrupt_summary(stem));
             continue;
         }
         let metadata = value.get("metadata");
@@ -58,6 +85,7 @@ pub fn list_books(app: tauri::AppHandle) -> Result<Vec<BookSummary>, String> {
             id: id.to_string(),
             title,
             author,
+            corrupt: false,
         });
     }
     Ok(books)
@@ -65,19 +93,19 @@ pub fn list_books(app: tauri::AppHandle) -> Result<Vec<BookSummary>, String> {
 
 #[tauri::command]
 pub fn load_book(app: tauri::AppHandle, id: String) -> Result<String, String> {
-    let path = library_dir(&app)?.join(format!("{id}.margin"));
+    let path = book_path(&app, &id)?;
     fs::read_to_string(&path).map_err(|e| e.to_string())
 }
 
 #[tauri::command]
 pub fn save_book(app: tauri::AppHandle, id: String, contents: String) -> Result<(), String> {
-    let path = library_dir(&app)?.join(format!("{id}.margin"));
+    let path = book_path(&app, &id)?;
-    fs::write(&path, contents).map_err(|e| e.to_string())
+    crate::project::atomic_write(&path, contents.as_bytes(), true)
 }
 
 #[tauri::command]
 pub fn delete_book(app: tauri::AppHandle, id: String) -> Result<(), String> {
-    let path = library_dir(&app)?.join(format!("{id}.margin"));
+    let path = book_path(&app, &id)?;
     if path.exists() {
         fs::remove_file(&path).map_err(|e| e.to_string())?;
     }

src-tauri/src/pdf.rs

@@ -1,7 +1,8 @@
 use base64::Engine;
 use base64::engine::general_purpose::STANDARD;
 use serde::Deserialize;
-use typst::diag::{Severity, SourceDiagnostic};
+use tauri::Emitter;
+use typst::diag::{Severity, SourceDiagnostic, Warned};
 use typst::layout::PagedDocument;
 use typst_as_lib::TypstEngine;
 
@@ -9,6 +10,29 @@ static LITERATA: &[u8] = include_bytes!("../../public/fonts/Literata-VF.ttf");
 static LITERATA_ITALIC: &[u8] = include_bytes!("../../public/fonts/Literata-Italic-VF.ttf");
 static HANKEN: &[u8] = include_bytes!("../../public/fonts/HankenGrotesk-VF.ttf");
 static HANKEN_ITALIC: &[u8] = include_bytes!("../../public/fonts/HankenGrotesk-Italic-VF.ttf");
+static EB_GARAMOND: &[u8] = include_bytes!("../../public/fonts/EBGaramond-VF.ttf");
+static EB_GARAMOND_ITALIC: &[u8] = include_bytes!("../../public/fonts/EBGaramond-Italic-VF.ttf");
+static LORA: &[u8] = include_bytes!("../../public/fonts/Lora-VF.ttf");
+static LORA_ITALIC: &[u8] = include_bytes!("../../public/fonts/Lora-Italic-VF.ttf");
+static SOURCE_SERIF: &[u8] = include_bytes!("../../public/fonts/SourceSerif4-VF.ttf");
+static SOURCE_SERIF_ITALIC: &[u8] = include_bytes!("../../public/fonts/SourceSerif4-Italic-VF.ttf");
+static FRAUNCES: &[u8] = include_bytes!("../../public/fonts/Fraunces-VF.ttf");
+static FRAUNCES_ITALIC: &[u8] = include_bytes!("../../public/fonts/Fraunces-Italic-VF.ttf");
+
+static EB_GARAMOND_FONTS: [&[u8]; 2] = [EB_GARAMOND, EB_GARAMOND_ITALIC];
+static LORA_FONTS: [&[u8]; 2] = [LORA, LORA_ITALIC];
+static SOURCE_SERIF_FONTS: [&[u8]; 2] = [SOURCE_SERIF, SOURCE_SERIF_ITALIC];
+static FRAUNCES_FONTS: [&[u8]; 2] = [FRAUNCES, FRAUNCES_ITALIC];
+
+fn bundled_font_bytes(id: &str) -> &'static [&'static [u8]] {
+    match id {
+        "eb-garamond" => &EB_GARAMOND_FONTS,
+        "lora" => &LORA_FONTS,
+        "source-serif" => &SOURCE_SERIF_FONTS,
+        "fraunces" => &FRAUNCES_FONTS,
+        _ => &[],
+    }
+}
 
 #[derive(Deserialize)]
 pub struct ImageInput {
@@ -16,7 +40,12 @@ pub struct ImageInput {
     data: String,
 }
 
-fn compile(source: String, images: &[ImageInput]) -> Result<Vec<u8>, String> {
+fn compile(
+    source: String,
+    images: &[ImageInput],
+    bundled_fonts: &[String],
+    system_fonts: &[String],
+) -> Result<(Vec<u8>, String), String> {
     let mut binaries: Vec<(&str, Vec<u8>)> = Vec::with_capacity(images.len());
     for image in images {
         let bytes = STANDARD
@@ -25,20 +54,53 @@ fn compile(source: String, images: &[ImageInput]) -> Result<Vec<u8>, String> {
         binaries.push((image.path.as_str(), bytes));
     }
 
+    let mut fonts: Vec<Vec<u8>> = vec![
+        LITERATA.to_vec(),
+        LITERATA_ITALIC.to_vec(),
+        HANKEN.to_vec(),
+        HANKEN_ITALIC.to_vec(),
+    ];
+    for id in bundled_fonts {
+        for bytes in bundled_font_bytes(id) {
+            fonts.push(bytes.to_vec());
+        }
+    }
+    for family in system_fonts {
+        fonts.extend(crate::fonts::system_font_bytes(family));
+    }
+
     let engine = TypstEngine::builder()
         .main_file(source)
-        .fonts([LITERATA, LITERATA_ITALIC, HANKEN, HANKEN_ITALIC])
+        .fonts(fonts)
         .with_static_file_resolver(binaries)
         .build();
 
-    let document: PagedDocument = engine.compile().output.map_err(|e| format_diagnostics(&e))?;
+    let Warned { output, warnings } = engine.compile();
-
+    let document: PagedDocument = output.map_err(|e| format_diagnostics(&e))?;
-    typst_pdf::pdf(&document, &Default::default()).map_err(|d| format_source_diagnostics(&d))
+    let bytes =
+        typst_pdf::pdf(&document, &Default::default()).map_err(|d| format_source_diagnostics(&d))?;
+    let warning_text = if warnings.is_empty() {
+        String::new()
+    } else {
+        format_source_diagnostics(&warnings)
+    };
+    Ok((bytes, warning_text))
 }
 
 #[tauri::command(async)]
-pub fn compile_pdf(source: String, images: Vec<ImageInput>) -> Result<tauri::ipc::Response, String> {
+pub fn compile_pdf(
-    compile(source, &images).map(tauri::ipc::Response::new)
+    app: tauri::AppHandle,
+    source: String,
+    images: Vec<ImageInput>,
+    emit_warnings: bool,
+    bundled_fonts: Vec<String>,
+    system_fonts: Vec<String>,
+) -> Result<tauri::ipc::Response, String> {
+    let (bytes, warnings) = compile(source, &images, &bundled_fonts, &system_fonts)?;
+    if emit_warnings && !warnings.is_empty() {
+        app.emit("pdf-warnings", warnings).ok();
+    }
+    Ok(tauri::ipc::Response::new(bytes))
 }
 
 fn format_diagnostics(error: &typst_as_lib::TypstAsLibError) -> String {

src-tauri/src/project.rs

@@ -1,6 +1,33 @@
 use base64::Engine;
 use base64::engine::general_purpose::STANDARD;
-use std::fs;
+use std::fs::{self, File};
+use std::io::Write;
+use std::path::{Path, PathBuf};
+
+fn with_suffix(path: &Path, suffix: &str) -> PathBuf {
+    let mut name = path.as_os_str().to_owned();
+    name.push(suffix);
+    PathBuf::from(name)
+}
+
+pub fn atomic_write(path: &Path, bytes: &[u8], backup: bool) -> Result<(), String> {
+    let tmp = with_suffix(path, ".tmp");
+    {
+        let mut f = File::create(&tmp).map_err(|e| e.to_string())?;
+        f.write_all(bytes).map_err(|e| e.to_string())?;
+        f.sync_all().map_err(|e| e.to_string())?;
+    }
+    if path.exists() {
+        if backup {
+            let bak = with_suffix(path, ".bak");
+            let _ = fs::remove_file(&bak);
+            fs::rename(path, &bak).map_err(|e| e.to_string())?;
+        } else {
+            fs::remove_file(path).map_err(|e| e.to_string())?;
+        }
+    }
+    fs::rename(&tmp, path).map_err(|e| e.to_string())
+}
 
 #[tauri::command]
 pub fn read_file(path: String) -> Result<String, String> {
@@ -9,11 +36,11 @@ pub fn read_file(path: String) -> Result<String, String> {
 
 #[tauri::command]
 pub fn write_file(path: String, contents: String) -> Result<(), String> {
-    fs::write(&path, contents).map_err(|e| e.to_string())
+    atomic_write(Path::new(&path), contents.as_bytes(), true)
 }
 
 #[tauri::command]
 pub fn write_bytes(path: String, data: String) -> Result<(), String> {
     let bytes = STANDARD.decode(data.as_bytes()).map_err(|e| e.to_string())?;
-    fs::write(&path, bytes).map_err(|e| e.to_string())
+    atomic_write(Path::new(&path), &bytes, false)
 }

src-tauri/src/proofing.rs

@@ -176,12 +176,13 @@ fn collect_grammar(harper: &mut Harper, text: &str, chars: &[char], issues: &mut
 #[tauri::command]
 pub async fn proof_text(
     app: tauri::AppHandle,
-    state: tauri::State<'_, ProofState>,
     text: String,
     spelling: bool,
     grammar: bool,
 ) -> Result<Vec<Issue>, String> {
-    let mut guard = state.inner().lock().map_err(|e| e.to_string())?;
+    tauri::async_runtime::spawn_blocking(move || -> Result<Vec<Issue>, String> {
+        let state = app.state::<ProofState>();
+        let mut guard = state.lock().map_err(|e| e.to_string())?;
         if guard.is_none() {
             *guard = Some(Engine {
                 speller: None,
@@ -206,6 +207,9 @@ pub async fn proof_text(
             collect_grammar(engine.harper.as_mut().unwrap(), &text, &chars, &mut issues);
         }
         Ok(issues)
+    })
+    .await
+    .map_err(|e| e.to_string())?
 }
 
 #[tauri::command]

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
-  "productName": "margin",
+  "productName": "Margin",
-  "version": "0.1.1",
+  "version": "0.1.7",
   "identifier": "studio.margin.app",
   "build": {
     "beforeDevCommand": "pnpm dev",
@@ -21,7 +21,7 @@
       }
     ],
     "security": {
-      "csp": null
+      "csp": "default-src 'self'; img-src 'self' data: blob:; font-src 'self'; style-src 'self' 'unsafe-inline'; script-src 'self'; worker-src 'self' blob:; connect-src 'self' ipc: http://ipc.localhost"
     }
   },
   "bundle": {

src/App.tsx

@@ -1,10 +1,13 @@
 import { useEffect } from "react";
 import { listen } from "@tauri-apps/api/event";
+import { getCurrentWindow } from "@tauri-apps/api/window";
 import { Library } from "./components/Library";
 import { EditorView } from "./components/EditorView";
+import { BackupSettings } from "./components/BackupSettings";
 import { useBook } from "./store/useBook";
+import { useBackup } from "./store/useBackup";
 import { isDesktop } from "./ipc";
-import { newBook } from "./library";
+import { createAndOpenBook, saveBook } from "./library";
 import { runExport } from "./export/run";
 import { checkForUpdates } from "./updater";
 
@@ -17,17 +20,70 @@ function App() {
     checkForUpdates(true);
     const unlisten = listen<string>("menu-action", (event) => {
       const state = useBook.getState();
-      if (event.payload === "new-book") state.openBook(newBook());
+      if (event.payload === "new-book") createAndOpenBook(state.openBook, state.setNotice);
       else if (event.payload === "export-pdf") runExport("pdf");
       else if (event.payload === "export-epub") runExport("epub");
       else if (event.payload === "check-updates") checkForUpdates(false);
     });
+    const unlistenWarn = listen<string>("pdf-warnings", (event) => {
+      useBook.getState().setNotice(`PDF exported with warnings:\n${event.payload}`);
+    });
+    return () => {
+      unlisten.then((stop) => stop());
+      unlistenWarn.then((stop) => stop());
+    };
+  }, []);
+
+  useEffect(() => {
+    if (!isDesktop) return;
+    const win = getCurrentWindow();
+    const unlisten = win.onCloseRequested(async (event) => {
+      const { book, dirty } = useBook.getState();
+      const { connected } = useBackup.getState();
+      if ((!book || !dirty) && !connected) return;
+      event.preventDefault();
+      if (book && dirty) await saveBook(book).catch(() => {});
+      if (connected) {
+        await Promise.race([
+          useBackup.getState().backup(true),
+          new Promise((resolve) => setTimeout(resolve, 8000)),
+        ]);
+      }
+      win.destroy();
+    });
     return () => {
       unlisten.then((stop) => stop());
     };
   }, []);
 
-  return book ? <EditorView /> : <Library onOpen={openBook} />;
+  useEffect(() => {
+    if (!isDesktop) return;
+    const unlisten = listen<{ ok: boolean; error: string | null }>("gdrive-auth", (event) => {
+      useBackup.getState().handleAuthEvent(event.payload.ok, event.payload.error);
+    });
+    return () => {
+      unlisten.then((stop) => stop());
+    };
+  }, []);
+
+  useEffect(() => {
+    if (!isDesktop) return;
+    const tick = async () => {
+      await useBackup.getState().refresh();
+      const state = useBackup.getState();
+      if (state.connected && state.pending) state.backup(true);
+    };
+    tick();
+    const id = setInterval(tick, 15 * 60 * 1000);
+    return () => clearInterval(id);
+  }, []);
+
+  return (
+    <>
+      {book ? <EditorView /> : <Library onOpen={openBook} />}
+      {isDesktop && <BackupSettings />}
+    </>
+  );
 }
 
 export default App;

src/backup.ts

@@ -0,0 +1,63 @@
+import { invoke } from "@tauri-apps/api/core";
+import { isDesktop } from "./ipc";
+
+export interface BackupStatus {
+  connected: boolean;
+  email: string | null;
+  lastBackup: number | null;
+  pending: boolean;
+}
+
+export interface RestoreResult {
+  restored: number;
+}
+
+export interface BackupOutcome extends BackupStatus {
+  uploaded: number;
+}
+
+export interface RemoteBackup {
+  name: string;
+}
+
+const OFFLINE: BackupStatus = { connected: false, email: null, lastBackup: null, pending: false };
+
+export async function gdriveStatus(): Promise<BackupStatus> {
+  if (!isDesktop) return OFFLINE;
+  return invoke<BackupStatus>("gdrive_status");
+}
+
+export async function gdriveConnect(): Promise<string> {
+  return invoke<string>("gdrive_connect");
+}
+
+export async function gdriveDisconnect(): Promise<BackupStatus> {
+  return invoke<BackupStatus>("gdrive_disconnect");
+}
+
+export async function gdriveBackup(): Promise<BackupOutcome> {
+  return invoke<BackupOutcome>("gdrive_backup");
+}
+
+export async function gdriveRestore(): Promise<RestoreResult> {
+  return invoke<RestoreResult>("gdrive_restore");
+}
+
+export async function gdriveListBackups(): Promise<RemoteBackup[]> {
+  if (!isDesktop) return [];
+  return invoke<RemoteBackup[]>("gdrive_list_backups");
+}
+
+export function formatBackupTime(ts: number | null): string {
+  if (!ts) return "Not backed up yet";
+  const diff = Date.now() - ts * 1000;
+  const min = Math.floor(diff / 60000);
+  if (min < 1) return "Backed up just now";
+  if (min < 60) return `Backed up ${min}m ago`;
+  const hr = Math.floor(min / 60);
+  if (hr < 24) return `Backed up ${hr}h ago`;
+  const day = Math.floor(hr / 24);
+  if (day === 1) return "Backed up yesterday";
+  if (day < 7) return `Backed up ${day}d ago`;
+  return `Backed up ${new Date(ts * 1000).toLocaleDateString()}`;
+}

src/book-style.ts

@@ -0,0 +1,13 @@
+import { type BookFonts, fontStack } from "./model/fonts";
+
+export function applyBookFonts(fonts: BookFonts): void {
+  const root = document.documentElement;
+  root.style.setProperty("--font-book", fontStack(fonts.body));
+  root.style.setProperty("--font-heading", fontStack(fonts.heading));
+}
+
+export function resetBookFonts(): void {
+  const root = document.documentElement;
+  root.style.removeProperty("--font-book");
+  root.style.removeProperty("--font-heading");
+}

src/components/BackupButton.tsx

@@ -0,0 +1,48 @@
+import { Icon } from "./Icon";
+import { useBackup } from "../store/useBackup";
+import { formatBackupTime } from "../backup";
+
+export function BackupButton() {
+  const connected = useBackup((s) => s.connected);
+  const pending = useBackup((s) => s.pending);
+  const phase = useBackup((s) => s.phase);
+  const lastBackup = useBackup((s) => s.lastBackup);
+  const openSettings = useBackup((s) => s.openSettings);
+
+  const busy = phase === "working" || phase === "connecting";
+  const error = phase === "error";
+
+  const state = busy ? "working" : error ? "error" : !connected ? "off" : pending ? "pending" : "synced";
+
+  const title =
+    phase === "connecting"
+      ? "Waiting for Google authorization…"
+      : state === "working"
+        ? "Backing up…"
+        : state === "error"
+          ? "Backup needs attention"
+          : state === "off"
+            ? "Connect Google Drive"
+            : state === "pending"
+              ? "Changes not backed up"
+              : formatBackupTime(lastBackup);
+
+  const onClick = () => {
+    openSettings();
+  };
+
+  return (
+    <button className="icon-btn backup-btn" data-state={state} onClick={onClick} title={title}>
+      {busy ? (
+        <Icon size={18}>
+          <path d="M21 12a9 9 0 1 1-2.6-6.4M21 4v5h-5" />
+        </Icon>
+      ) : (
+        <Icon size={18}>
+          <path d="M7 18a4 4 0 0 1 0-8 5 5 0 0 1 9.6-1.3A3.5 3.5 0 0 1 18 18H7z" />
+          {connected ? <path d="M12 16.5v-5M9.7 12.8l2.3-2.3 2.3 2.3" /> : null}
+        </Icon>
+      )}
+    </button>
+  );
+}

src/components/BackupSettings.tsx

@@ -0,0 +1,146 @@
+import { useEffect, useState } from "react";
+import { Icon } from "./Icon";
+import { ConfirmDialog } from "./ConfirmDialog";
+import { useBackup } from "../store/useBackup";
+import { formatBackupTime, gdriveListBackups } from "../backup";
+
+export function BackupSettings() {
+  const open = useBackup((s) => s.settingsOpen);
+  const close = useBackup((s) => s.closeSettings);
+  const connected = useBackup((s) => s.connected);
+  const email = useBackup((s) => s.email);
+  const lastBackup = useBackup((s) => s.lastBackup);
+  const pending = useBackup((s) => s.pending);
+  const phase = useBackup((s) => s.phase);
+  const connect = useBackup((s) => s.connect);
+  const disconnect = useBackup((s) => s.disconnect);
+  const backup = useBackup((s) => s.backup);
+  const restore = useBackup((s) => s.restore);
+  const cancelConnect = useBackup((s) => s.cancelConnect);
+  const openAuthUrl = useBackup((s) => s.openAuthUrl);
+  const copyAuthUrl = useBackup((s) => s.copyAuthUrl);
+
+  const [remoteCount, setRemoteCount] = useState<number | null>(null);
+  const [confirmRestore, setConfirmRestore] = useState(false);
+  const working = phase === "working";
+
+  useEffect(() => {
+    if (!open || !connected) {
+      setRemoteCount(null);
+      return;
+    }
+    let active = true;
+    gdriveListBackups()
+      .then((list) => active && setRemoteCount(list.length))
+      .catch(() => active && setRemoteCount(null));
+    return () => {
+      active = false;
+    };
+  }, [open, connected, lastBackup]);
+
+  if (!open) return null;
+
+  return (
+    <>
+      <div className="overlay" onClick={close}>
+        <div className="panel" onClick={(e) => e.stopPropagation()}>
+          <div className="panel-head">
+            <h2>Backup &amp; Sync</h2>
+            <button className="icon-btn" onClick={close} title="Close">
+              <Icon d="M6 6l12 12M18 6L6 18" />
+            </button>
+          </div>
+          <div className="panel-body">
+            {phase === "connecting" ? (
+              <div className="backup-connecting">
+                <div className="backup-waiting">
+                  <Icon size={16}>
+                    <path d="M21 12a9 9 0 1 1-2.6-6.4M21 4v5h-5" />
+                  </Icon>
+                  <span>Waiting for Google authorization…</span>
+                </div>
+                <p>Finish in the browser tab that opened. If it didn't open, reopen the link or copy it into a browser.</p>
+                <div className="backup-link-row">
+                  <button className="backup-text-btn" onClick={cancelConnect}>
+                    Stop linking
+                  </button>
+                  <div className="backup-links">
+                    <button className="backup-text-btn" onClick={openAuthUrl}>
+                      Open link again
+                    </button>
+                    <span className="backup-link-sep">·</span>
+                    <button className="backup-text-btn" onClick={copyAuthUrl}>
+                      Copy link
+                    </button>
+                  </div>
+                </div>
+              </div>
+            ) : !connected ? (
+              <div className="backup-intro">
+                <p>
+                  Connect Google Drive to keep a private backup of every book. margin only ever sees the files it
+                  creates in a <strong>margin</strong> folder, never the rest of your Drive.
+                </p>
+                <button className="btn-primary" disabled={working} onClick={connect}>
+                  {working ? "Connecting…" : "Connect Google Drive"}
+                </button>
+              </div>
+            ) : (
+              <>
+                <div className="backup-account">
+                  <div className="backup-account-info">
+                    <span className="field-label">Connected account</span>
+                    <span className="backup-email">{email || "Google Drive"}</span>
+                  </div>
+                  <button className="btn-ghost" disabled={working} onClick={disconnect}>
+                    Disconnect
+                  </button>
+                </div>
+
+                <div className="backup-status-row">
+                  <span className={`backup-dot ${pending ? "is-pending" : "is-synced"}`} />
+                  <span>{pending ? "Changes not backed up" : formatBackupTime(lastBackup)}</span>
+                </div>
+
+                <div className="backup-actions">
+                  <button className="btn-primary" disabled={working} onClick={() => backup()}>
+                    {working ? "Working…" : "Back up now"}
+                  </button>
+                  <button
+                    className="btn-ghost"
+                    disabled={working || remoteCount === 0}
+                    onClick={() => setConfirmRestore(true)}
+                  >
+                    {remoteCount === null ? "Restore from Drive" : `Restore ${remoteCount} book${remoteCount === 1 ? "" : "s"}`}
+                  </button>
+                </div>
+
+                <p className="backup-note">
+                  Backs up automatically when you close margin, and every 15 minutes while there are changes.
+                </p>
+              </>
+            )}
+          </div>
+        </div>
+      </div>
+
+      {confirmRestore && (
+        <ConfirmDialog
+          title="Restore from Google Drive"
+          message={
+            <>
+              This replaces your local books with the copies in Google Drive. Any local changes that haven't been backed
+              up will be lost.
+            </>
+          }
+          confirmLabel="Restore"
+          onConfirm={() => {
+            setConfirmRestore(false);
+            restore();
+          }}
+          onClose={() => setConfirmRestore(false)}
+        />
+      )}
+    </>
+  );
+}

src/components/DeviceFrame.tsx

@@ -0,0 +1,67 @@
+import type { CSSProperties, ReactNode } from "react";
+import type { Device } from "../devices";
+import type { Book } from "../model/book";
+import { CoverArt } from "./CoverArt";
+
+interface DeviceFrameProps {
+  device: Device;
+  eyebrow?: ReactNode;
+  title?: ReactNode;
+  html?: string;
+  cover?: Book;
+}
+
+function frameVars(device: Device): CSSProperties {
+  return {
+    "--dv-bg": device.bg,
+    "--dv-ink": device.ink,
+    "--dv-fs": device.fontSize,
+    "--dv-lh": device.lineHeight,
+    "--dv-mx": device.marginX,
+    "--dv-my": device.marginY,
+    "--dv-bezel": device.bezel,
+    "--dv-bezel-w": device.bezelWidth,
+    "--dv-radius": device.radius,
+    "--dv-aspect": device.aspect,
+  } as CSSProperties;
+}
+
+function StatusBar() {
+  return (
+    <div className="device-statusbar">
+      <span className="device-clock">9:41</span>
+      <span className="device-batt" />
+    </div>
+  );
+}
+
+export function DeviceFrame({ device, eyebrow, title, html, cover }: DeviceFrameProps) {
+  return (
+    <div className="device-stage">
+      <div className="device-frame" data-kind={device.kind} style={frameVars(device)}>
+        <div className="device-screen">
+          {device.kind === "tablet" && <StatusBar />}
+          <div className="device-content">
+            {cover ? (
+              <CoverArt book={cover} />
+            ) : (
+              <>
+                <div className="device-opener">
+                  {eyebrow && <div className="device-eyebrow">{eyebrow}</div>}
+                  {title && <div className="device-title">{title}</div>}
+                </div>
+                <div className="device-body" dangerouslySetInnerHTML={{ __html: html ?? "" }} />
+              </>
+            )}
+          </div>
+          {device.kind === "eink" && (
+            <div className="device-footer">
+              <span className="device-foot-title">{cover ? device.label : title}</span>
+              <span className="device-batt" />
+            </div>
+          )}
+        </div>
+      </div>
+    </div>
+  );
+}

src/components/Dock.tsx

@@ -1,12 +1,15 @@
-import { useEffect, useMemo, useRef, useState } from "react";
+import { type ReactNode, useEffect, useMemo, useRef, useState } from "react";
 import { generateHTML } from "@tiptap/core";
 import { COVER_ID, useBook } from "../store/useBook";
-import { type TrimSize, bodyNumber, chapterKind } from "../model/book";
+import { type Chapter, type TrimSize, bodyNumber, chapterKind } from "../model/book";
 import { editorExtensions } from "../editor/extensions";
 import { chapterToPdfInputs, coverToPdfInputs } from "../export/typst";
 import { compilePdf, isDesktop } from "../ipc";
+import { DEVICES, type Device, findDevice } from "../devices";
+import { usePreviewMode } from "../store/usePreviewMode";
 import { PdfPreview } from "./PdfPreview";
 import { CoverArt } from "./CoverArt";
+import { DeviceFrame } from "./DeviceFrame";
 
 const TRIMS: { value: TrimSize; label: string }[] = [
   { value: "6x9", label: "6 × 9 in" },
@@ -15,26 +18,77 @@ const TRIMS: { value: TrimSize; label: string }[] = [
   { value: "a5", label: "A5" },
 ];
 
-function TrimSelect() {
+function PreviewSelect() {
   const trim = useBook((s) => s.book?.settings.trim ?? "6x9");
   const setSettings = useBook((s) => s.setSettings);
+  const mode = usePreviewMode((s) => s.mode);
+  const setMode = usePreviewMode((s) => s.setMode);
+  const value = mode === "print" ? trim : mode;
   return (
     <select
       className="trim-select"
-      value={trim}
+      value={value}
-      onChange={(e) => setSettings({ trim: e.target.value as TrimSize })}
+      onChange={(e) => {
-      title="Trim size"
+        const v = e.target.value;
+        if (findDevice(v)) {
+          setMode(v as Device["id"]);
+        } else {
+          setSettings({ trim: v as TrimSize });
+          setMode("print");
+        }
+      }}
+      title="Preview format"
     >
+      <optgroup label="Print">
         {TRIMS.map((t) => (
           <option key={t.value} value={t.value}>
             {t.label}
           </option>
         ))}
+      </optgroup>
+      <optgroup label="Devices">
+        {DEVICES.map((d) => (
+          <option key={d.id} value={d.id}>
+            {d.label}
+          </option>
+        ))}
+      </optgroup>
     </select>
   );
 }
 
+function DockHead({ meta }: { meta?: ReactNode }) {
+  return (
+    <div className="dock-head">
+      <span className="label">Preview</span>
+      <div className="dock-tools">
+        {meta}
+        <PreviewSelect />
+      </div>
+    </div>
+  );
+}
+
+function chapterEyebrow(chapter: Chapter, chapters: Chapter[], idx: number): string {
+  const kind = chapterKind(chapter);
+  return kind === "body" ? `Chapter ${bodyNumber(chapters, idx) ?? ""}` : kind === "front" ? "Front matter" : "Back matter";
+}
+
+function useActiveChapter() {
+  const book = useBook((s) => s.book);
+  const activeChapterId = useBook((s) => s.activeChapterId);
+  const chapters = book?.chapters ?? [];
+  const idx = chapters.findIndex((c) => c.id === activeChapterId);
+  const chapter = chapters[idx] ?? chapters[0];
+  const html = useMemo(() => (chapter ? generateHTML(chapter.content, editorExtensions) : ""), [chapter]);
+  const eyebrow = chapter ? chapterEyebrow(chapter, chapters, idx) : "";
+  return { book, coverActive: activeChapterId === COVER_ID, chapters, idx, chapter, html, eyebrow };
+}
+
 export function Dock() {
+  const mode = usePreviewMode((s) => s.mode);
+  const device = findDevice(mode);
+  if (device) return <DeviceDock device={device} />;
   return isDesktop ? <PdfDock /> : <HtmlDock />;
 }
 
@@ -53,8 +107,8 @@ function PdfDock() {
     clearTimeout(timer.current);
     setBusy(true);
     timer.current = setTimeout(() => {
-      const { source, images } = coverActive ? coverToPdfInputs(book) : chapterToPdfInputs(book, idx);
+      const { source, images, fonts } = coverActive ? coverToPdfInputs(book) : chapterToPdfInputs(book, idx);
-      compilePdf(source, images)
+      compilePdf(source, images, false, fonts)
         .then((bytes) => {
           setPdf(bytes);
           setError(null);
@@ -67,13 +121,7 @@ function PdfDock() {
 
   return (
     <section className="dock">
-      <div className="dock-head">
+      <DockHead meta={busy ? <span className="meta">updating…</span> : null} />
-        <span className="label">Preview</span>
-        <div className="dock-tools">
-          {busy && <span className="meta">updating…</span>}
-          <TrimSelect />
-        </div>
-      </div>
       {error ? (
         <pre className="dock-error">{error}</pre>
       ) : pdf ? (
@@ -86,26 +134,14 @@ function PdfDock() {
 }
 
 function HtmlDock() {
-  const book = useBook((s) => s.book);
+  const { book, coverActive, chapters, idx, chapter, html, eyebrow } = useActiveChapter();
-  const activeChapterId = useBook((s) => s.activeChapterId);
-  const coverActive = activeChapterId === COVER_ID;
-  const chapters = book?.chapters ?? [];
-  const idx = chapters.findIndex((c) => c.id === activeChapterId);
-  const chapter = chapters[idx] ?? chapters[0];
-  const html = useMemo(() => (chapter ? generateHTML(chapter.content, editorExtensions) : ""), [chapter]);
 
   if (!book) return null;
 
   if (coverActive) {
     return (
       <section className="dock">
-        <div className="dock-head">
+        <DockHead meta={<span className="meta">Cover</span>} />
-          <span className="label">Preview</span>
-          <div className="dock-tools">
-            <span className="meta">Cover</span>
-            <TrimSelect />
-          </div>
-        </div>
         <div className="cover-stage">
           <CoverArt book={book} />
         </div>
@@ -115,21 +151,15 @@ function HtmlDock() {
 
   if (!chapter) return null;
 
-  const kind = chapterKind(chapter);
-  const eyebrow =
-    kind === "body" ? `Chapter ${bodyNumber(chapters, idx) ?? ""}` : kind === "front" ? "Front matter" : "Back matter";
-
   return (
     <section className="dock">
-      <div className="dock-head">
+      <DockHead
-        <span className="label">Preview</span>
+        meta={
-        <div className="dock-tools">
           <span className="meta">
             {idx + 1} of {chapters.length}
           </span>
-          <TrimSelect />
+        }
-        </div>
+      />
-      </div>
       <div className="page">
         <div className="p-opener">
           <div className="p-num">{eyebrow}</div>
@@ -141,3 +171,45 @@ function HtmlDock() {
     </section>
   );
 }
+
+function DeviceDock({ device }: { device: Device }) {
+  const { book, coverActive, chapters, idx, chapter, html, eyebrow } = useActiveChapter();
+
+  if (!book) return null;
+
+  if (coverActive) {
+    return (
+      <section className="dock">
+        <DockHead meta={<span className="meta">Cover</span>} />
+        <DeviceFrame device={device} cover={book} />
+      </section>
+    );
+  }
+
+  if (!chapter) {
+    return (
+      <section className="dock">
+        <DockHead />
+        <div className="dock-empty">No chapter selected.</div>
+      </section>
+    );
+  }
+
+  return (
+    <section className="dock">
+      <DockHead
+        meta={
+          <span className="meta">
+            {idx + 1} of {chapters.length}
+          </span>
+        }
+      />
+      <DeviceFrame
+        device={device}
+        eyebrow={eyebrow}
+        title={chapter.noTitle ? undefined : chapter.title || "Untitled"}
+        html={html}
+      />
+    </section>
+  );
+}

src/components/EditorView.tsx

@@ -5,6 +5,7 @@ import { Dock } from "./Dock";
 import { ResizeHandle } from "./ResizeHandle";
 import { Icon } from "./Icon";
 import { Settings } from "./Settings";
+import { BackupButton } from "./BackupButton";
 import { CoverView } from "./CoverView";
 import { FindBar } from "./FindBar";
 import { ProofPopover } from "./ProofPopover";
@@ -12,6 +13,7 @@ import { Editor } from "../editor/Editor";
 import { FloatingToolbar } from "../editor/FloatingToolbar";
 import type { ProofCoords, ProofIssue, ProofingStorage } from "../editor/proofing";
 import { COVER_ID, useBook } from "../store/useBook";
+import { useBackup } from "../store/useBackup";
 import { useProofing } from "../store/useProofing";
 import { useTheme } from "../store/useTheme";
 import { useWidth } from "../store/useWidth";
@@ -75,8 +77,14 @@ export function EditorView() {
 
   const saveNow = useCallback(() => {
     const current = useBook.getState().book;
-    if (current) saveBook(current).then(markSaved).catch((e) => setNotice(`Save failed: ${e}`));
+    if (!current) return;
-  }, [markSaved]);
+    saveBook(current)
+      .then(() => {
+        if (useBook.getState().book === current) markSaved();
+        useBackup.getState().refresh();
+      })
+      .catch((e) => setNotice(`Save failed: ${e}`));
+  }, [markSaved, setNotice]);
 
   useEffect(() => {
     if (!book || !dirty || !isDesktop) return;
@@ -158,6 +166,7 @@ export function EditorView() {
           {dirty && <span className="dirty-dot" />}
         </button>
         <div className="actions">
+          {isDesktop && <BackupButton />}
           <button className="icon-btn" data-on={findOpen} onClick={() => (findOpen ? setFindOpen(false) : openFind(false))} title="Find (⌘F)">
             <Icon d="M11 4a7 7 0 1 0 0 14 7 7 0 0 0 0-14zM20 20l-4-4" />
           </button>
@@ -263,10 +272,15 @@ export function EditorView() {
                   )}
                 </header>
                 <Editor
+                  key={chapter.id}
+                  bookId={book.id}
                   chapterId={chapter.id}
                   content={chapter.content}
                   onChange={(content) => setChapterContent(chapter.id, content)}
                   onReady={setEditor}
+                  onContentError={() =>
+                    setNotice("This chapter contains content Margin couldn't fully read; editing may drop the unrecognized parts.")
+                  }
                 />
               </article>
               <FloatingToolbar editor={editor} />

src/components/Library.tsx

@@ -1,18 +1,26 @@
 import { useEffect, useState } from "react";
-import { type BookSummary, deleteBook, exampleBook, listBooks, loadBook, newBook, saveBook } from "../library";
+import { type BookSummary, createAndOpenBook, deleteBook, exampleBook, listBooks, loadBook, saveBook } from "../library";
 import type { Book } from "../model/book";
 import { importEpub } from "../import/epub";
+import { clearPositions } from "../editor/positions";
 import { isDesktop } from "../ipc";
 import { ConfirmDialog } from "./ConfirmDialog";
 import { Icon } from "./Icon";
 import { RowMenu } from "./RowMenu";
+import { BackupButton } from "./BackupButton";
+import { useBackup } from "../store/useBackup";
+import { useBook } from "../store/useBook";
 
 export function Library({ onOpen }: { onOpen: (book: Book) => void }) {
   const [books, setBooks] = useState<BookSummary[]>([]);
   const [loaded, setLoaded] = useState(false);
   const [busy, setBusy] = useState(false);
-  const [notice, setNotice] = useState<string | null>(null);
   const [pendingDelete, setPendingDelete] = useState<BookSummary | null>(null);
+  const notice = useBook((s) => s.notice);
+  const setNotice = useBook((s) => s.setNotice);
+  const restoreNonce = useBackup((s) => s.restoreNonce);
+  const restoreWorking = useBackup((s) => s.phase === "working");
+  const restoreFromDrive = useBackup((s) => s.restoreFromDrive);
 
   const refresh = () =>
     listBooks()
@@ -22,6 +30,14 @@ export function Library({ onOpen }: { onOpen: (book: Book) => void }) {
   useEffect(() => {
     refresh();
   }, []);
+  useEffect(() => {
+    if (restoreNonce) refresh();
+  }, [restoreNonce]);
+  useEffect(() => {
+    if (!notice) return;
+    const timer = setTimeout(() => setNotice(null), 4000);
+    return () => clearTimeout(timer);
+  }, [notice]);
 
   const handleExample = async () => {
     const copy = exampleBook();
@@ -38,6 +54,7 @@ export function Library({ onOpen }: { onOpen: (book: Book) => void }) {
   const removeBook = async () => {
     if (!pendingDelete) return;
     await deleteBook(pendingDelete.id);
+    clearPositions(pendingDelete.id);
     setPendingDelete(null);
     refresh();
   };
@@ -62,9 +79,11 @@ export function Library({ onOpen }: { onOpen: (book: Book) => void }) {
 
   return (
     <div className="library">
-      <header className="library-head" data-tauri-drag-region />
+      <header className="library-head" data-tauri-drag-region>
+        {isDesktop && <BackupButton />}
+      </header>
       <div className="shelf">
-        <button className="card card-action" onClick={() => onOpen(newBook())}>
+        <button className="card card-action" onClick={() => createAndOpenBook(onOpen, setNotice)}>
           <Icon d="M12 5v14M5 12h14" size={20} />
           <span>New book</span>
         </button>
@@ -78,14 +97,34 @@ export function Library({ onOpen }: { onOpen: (book: Book) => void }) {
             <span className="card-badge">Example</span>
           </button>
         )}
-        {books.map((b) => (
+        {books.map((b) =>
-          <div key={b.id} className="card card-book" onClick={() => loadBook(b.id).then(onOpen)}>
+          b.corrupt ? (
+            <div key={b.id} className="card card-book card-corrupt">
+              <span className="card-title">{b.title}</span>
+              <span className="card-author">Couldn't be read; a .bak backup may sit beside it.</span>
+              <RowMenu label="Book options" className="card-menu" onDelete={() => setPendingDelete(b)} />
+            </div>
+          ) : (
+            <div
+              key={b.id}
+              className="card card-book"
+              onClick={() => loadBook(b.id).then(onOpen).catch((e) => setNotice(`Could not open book: ${e}`))}
+            >
               <span className="card-title">{b.title || "Untitled"}</span>
               {b.author && <span className="card-author">{b.author}</span>}
               <RowMenu label="Book options" className="card-menu" onDelete={() => setPendingDelete(b)} />
             </div>
-        ))}
+          ),
+        )}
       </div>
+      {loaded && books.length === 0 && isDesktop && (
+        <div className="library-restore">
+          <button className="restore-link" onClick={restoreFromDrive} disabled={restoreWorking}>
+            <Icon d="M21 12a9 9 0 1 1-2.6-6.4M21 4v5h-5" size={15} />
+            {restoreWorking ? "Restoring…" : "Restore from Google Drive"}
+          </button>
+        </div>
+      )}
       {notice && (
         <div className="toast" onClick={() => setNotice(null)}>
           {notice}

src/components/PdfPreview.tsx

@@ -1,4 +1,4 @@
-import { useEffect, useRef } from "react";
+import { useEffect, useRef, useState } from "react";
 import * as pdfjs from "pdfjs-dist";
 import workerUrl from "pdfjs-dist/build/pdf.worker.min.mjs?url";
 
@@ -6,14 +6,17 @@ pdfjs.GlobalWorkerOptions.workerSrc = workerUrl;
 
 export function PdfPreview({ data }: { data: Uint8Array }) {
   const ref = useRef<HTMLDivElement>(null);
+  const [error, setError] = useState<string | null>(null);
 
   useEffect(() => {
     const container = ref.current;
     if (!container) return;
     let cancelled = false;
+    const loadingTask = pdfjs.getDocument({ data: data.slice() });
 
     (async () => {
-      const doc = await pdfjs.getDocument({ data: data.slice() }).promise;
+      try {
+        const doc = await loadingTask.promise;
         if (cancelled) return;
         const width = container.clientWidth;
         const dpr = window.devicePixelRatio || 1;
@@ -30,18 +33,29 @@ export function PdfPreview({ data }: { data: Uint8Array }) {
           canvas.width = viewport.width;
           canvas.height = viewport.height;
           canvas.style.width = "100%";
-        const context = canvas.getContext("2d")!;
+          await page.render({ canvas, viewport }).promise;
-        await page.render({ canvas, canvasContext: context, viewport }).promise;
           if (cancelled) return;
           canvases.push(canvas);
         }
         container.replaceChildren(...canvases);
+        setError(null);
+      } catch (e) {
+        if (cancelled) return;
+        container.replaceChildren();
+        setError(String(e));
+      }
     })();
 
     return () => {
       cancelled = true;
+      loadingTask.destroy();
     };
   }, [data]);
 
-  return <div className="pdf-pages" ref={ref} />;
+  return (
+    <>
+      {error && <pre className="dock-error">{error}</pre>}
+      <div className="pdf-pages" ref={ref} />
+    </>
+  );
 }

src/components/Settings.tsx

@@ -1,6 +1,18 @@
-import { useState } from "react";
+import { useEffect, useState } from "react";
 import type { ReactNode } from "react";
 import { useBook } from "../store/useBook";
+import { listSystemFonts } from "../ipc";
+import {
+  type BookFonts,
+  type FontRef,
+  BUNDLED_FONTS,
+  DEFAULT_FONTS,
+  FONT_PAIRINGS,
+  decodeRef,
+  encodeRef,
+  fontStack,
+  pairingFor,
+} from "../model/fonts";
 import { Icon } from "./Icon";
 
 const LANGUAGES = [
@@ -12,6 +24,8 @@ const LANGUAGES = [
   { value: "pt", label: "Portuguese" },
 ];
 
+let systemFontCache: string[] | null = null;
+
 interface Draft {
   title: string;
   subtitle: string;
@@ -19,6 +33,7 @@ interface Draft {
   isbn: string;
   language: string;
   bleed: boolean;
+  fonts: BookFonts;
 }
 
 function Field({ label, children }: { label: string; children: ReactNode }) {
@@ -30,6 +45,30 @@ function Field({ label, children }: { label: string; children: ReactNode }) {
   );
 }
 
+function FontSelect({ value, system, onChange }: { value: FontRef; system: string[]; onChange: (ref: FontRef) => void }) {
+  const extra = value.kind === "system" && !system.includes(value.family) ? [value.family] : [];
+  return (
+    <select value={encodeRef(value)} style={{ fontFamily: fontStack(value) }} onChange={(e) => onChange(decodeRef(e.target.value))}>
+      <optgroup label="Bundled">
+        {BUNDLED_FONTS.map((f) => (
+          <option key={f.id} value={`b:${f.id}`}>
+            {f.label}
+          </option>
+        ))}
+      </optgroup>
+      {(system.length > 0 || extra.length > 0) && (
+        <optgroup label="System">
+          {[...extra, ...system].map((name) => (
+            <option key={name} value={`s:${name}`}>
+              {name}
+            </option>
+          ))}
+        </optgroup>
+      )}
+    </select>
+  );
+}
+
 export function Settings({ onClose, onSave }: { onClose: () => void; onSave: () => void }) {
   const book = useBook((s) => s.book);
   const setMetadata = useBook((s) => s.setMetadata);
@@ -42,16 +81,31 @@ export function Settings({ onClose, onSave }: { onClose: () => void; onSave: ()
     isbn: book?.metadata.isbn ?? "",
     language: book?.metadata.language ?? "en",
     bleed: book?.settings.bleed ?? true,
+    fonts: book?.settings.fonts ?? DEFAULT_FONTS,
   }));
+  const [system, setSystem] = useState<string[]>(() => systemFontCache ?? []);
+  const [advanced, setAdvanced] = useState(() => pairingFor(draft.fonts) === null);
+
+  useEffect(() => {
+    if (systemFontCache) return;
+    listSystemFonts().then((fonts) => {
+      systemFontCache = fonts;
+      setSystem(fonts);
+    });
+  }, []);
 
   if (!book) return null;
 
   const set = (patch: Partial<Draft>) => setDraft((d) => ({ ...d, ...patch }));
+  const setFont = (slot: "body" | "heading", ref: FontRef) => set({ fonts: { ...draft.fonts, [slot]: ref } });
+
+  const activePreset = pairingFor(draft.fonts);
+  const usesSystem = draft.fonts.body.kind === "system" || draft.fonts.heading.kind === "system";
 
   const save = () => {
-    const { bleed, ...metadata } = draft;
+    const { bleed, fonts, ...metadata } = draft;
     setMetadata(metadata);
-    setSettings({ bleed });
+    setSettings({ bleed, fonts });
     onSave();
     onClose();
   };
@@ -87,6 +141,51 @@ export function Settings({ onClose, onSave }: { onClose: () => void; onSave: ()
               ))}
             </select>
           </Field>
+
+          <div className="field">
+            <span className="field-label">Typography</span>
+            <div className="font-presets">
+              {FONT_PAIRINGS.map((p) => (
+                <button
+                  key={p.id}
+                  type="button"
+                  className="font-preset"
+                  data-on={activePreset === p.id}
+                  onClick={() => set({ fonts: { body: p.body, heading: p.heading } })}
+                >
+                  <span className="font-preset-demo" style={{ fontFamily: fontStack(p.heading) }}>
+                    Ag
+                  </span>
+                  <span className="font-preset-name">{p.label}</span>
+                </button>
+              ))}
+            </div>
+            <button type="button" className="font-advanced" onClick={() => setAdvanced((v) => !v)}>
+              {advanced ? "Hide custom fonts" : "Customize fonts"}
+            </button>
+          </div>
+
+          {advanced && (
+            <>
+              <Field label="Body font">
+                <FontSelect value={draft.fonts.body} system={system} onChange={(ref) => setFont("body", ref)} />
+              </Field>
+              <Field label="Heading font">
+                <FontSelect value={draft.fonts.heading} system={system} onChange={(ref) => setFont("heading", ref)} />
+              </Field>
+              {usesSystem && (
+                <p className="font-note">System fonts preview here but may not embed in exported PDF or EPUB, so they can look different on other devices.</p>
+              )}
+            </>
+          )}
+
+          <div className="font-sample" style={{ fontFamily: fontStack(draft.fonts.body) }}>
+            <span className="font-sample-title" style={{ fontFamily: fontStack(draft.fonts.heading) }}>
+              Chapter One
+            </span>
+            She read the first line twice, and the whole quiet house seemed to lean in to listen.
+          </div>
+
           <label className="check">
             <input type="checkbox" checked={draft.bleed} onChange={(e) => set({ bleed: e.target.checked })} />
             Add bleed for full-page images (print)

src/devices.ts

@@ -0,0 +1,115 @@
+export type DeviceId = "kindle" | "kobo" | "ipad" | "iphone" | "android";
+export type PreviewMode = "print" | DeviceId;
+export type DeviceKind = "eink" | "phone" | "tablet";
+
+export interface Device {
+  id: DeviceId;
+  label: string;
+  kind: DeviceKind;
+  bg: string;
+  ink: string;
+  fontSize: number;
+  lineHeight: number;
+  marginX: number;
+  marginY: number;
+  aspect: number;
+  bezel: string;
+  bezelWidth: number;
+  radius: number;
+}
+
+export const DEVICES: Device[] = [
+  {
+    id: "kindle",
+    label: "Kindle Paperwhite",
+    kind: "eink",
+    bg: "#f4f3ee",
+    ink: "#2b2b2b",
+    fontSize: 16,
+    lineHeight: 1.55,
+    marginX: 34,
+    marginY: 40,
+    aspect: 1240 / 1680,
+    bezel: "#1c1c1c",
+    bezelWidth: 18,
+    radius: 14,
+  },
+  {
+    id: "kobo",
+    label: "Kobo",
+    kind: "eink",
+    bg: "#f6f5f0",
+    ink: "#262626",
+    fontSize: 16,
+    lineHeight: 1.6,
+    marginX: 34,
+    marginY: 40,
+    aspect: 1264 / 1680,
+    bezel: "#2a2a2a",
+    bezelWidth: 16,
+    radius: 16,
+  },
+  {
+    id: "ipad",
+    label: "iPad",
+    kind: "tablet",
+    bg: "#fbfaf7",
+    ink: "#1d1d1f",
+    fontSize: 18,
+    lineHeight: 1.65,
+    marginX: 56,
+    marginY: 56,
+    aspect: 1640 / 2360,
+    bezel: "#3a3a3c",
+    bezelWidth: 20,
+    radius: 28,
+  },
+  {
+    id: "iphone",
+    label: "iPhone",
+    kind: "phone",
+    bg: "#ffffff",
+    ink: "#1d1d1f",
+    fontSize: 17,
+    lineHeight: 1.6,
+    marginX: 26,
+    marginY: 30,
+    aspect: 1179 / 2556,
+    bezel: "#1a1a1c",
+    bezelWidth: 12,
+    radius: 44,
+  },
+  {
+    id: "android",
+    label: "Android phone",
+    kind: "phone",
+    bg: "#ffffff",
+    ink: "#202124",
+    fontSize: 16,
+    lineHeight: 1.6,
+    marginX: 24,
+    marginY: 28,
+    aspect: 1080 / 2400,
+    bezel: "#0f0f0f",
+    bezelWidth: 11,
+    radius: 36,
+  },
+];
+
+const DEVICE_MAP = new Map<string, Device>(DEVICES.map((d) => [d.id, d]));
+
+const KEY = "margin-preview-mode";
+
+export function findDevice(id: string): Device | undefined {
+  return DEVICE_MAP.get(id);
+}
+
+export function initialPreviewMode(): PreviewMode {
+  const saved = localStorage.getItem(KEY);
+  if (saved === "print" || (saved && DEVICE_MAP.has(saved))) return saved as PreviewMode;
+  return "print";
+}
+
+export function persistPreviewMode(mode: PreviewMode) {
+  localStorage.setItem(KEY, mode);
+}

src/editor/Editor.tsx

@@ -2,34 +2,88 @@ import { useEffect, useRef } from "react";
 import { EditorContent, useEditor, type Editor as TiptapEditor } from "@tiptap/react";
 import type { JSONContent } from "@tiptap/core";
 import { editorExtensions } from "./extensions";
+import { loadPosition, savePosition, type ChapterPosition } from "./positions";
 
 interface EditorProps {
+  bookId: string;
   chapterId: string;
   content: JSONContent;
   onChange: (content: JSONContent) => void;
   onReady: (editor: TiptapEditor | null) => void;
+  onContentError: (error: Error) => void;
 }
 
-export function Editor({ chapterId, content, onChange, onReady }: EditorProps) {
+export function Editor({ bookId, chapterId, content, onChange, onReady, onContentError }: EditorProps) {
   const onChangeRef = useRef(onChange);
   onChangeRef.current = onChange;
+  const onContentErrorRef = useRef(onContentError);
+  onContentErrorRef.current = onContentError;
+
+  const latest = useRef<ChapterPosition | null>(null);
 
   const editor = useEditor({
     extensions: editorExtensions,
     content,
     immediatelyRender: false,
+    enableContentCheck: true,
     editorProps: { attributes: { class: "prose" } },
+    onContentError: ({ error }) => onContentErrorRef.current(error),
     onUpdate: ({ editor }) => onChangeRef.current(editor.getJSON()),
   });
 
   useEffect(() => {
     onReady(editor);
+    return () => onReady(null);
   }, [editor, onReady]);
 
   useEffect(() => {
-    if (editor) editor.commands.setContent(content, { emitUpdate: false });
+    if (!editor) return;
+    let active = true;
+    const scroller = editor.view.dom.closest(".editor-pane") as HTMLElement | null;
+
+    const saved = loadPosition(bookId, chapterId);
+    const size = editor.state.doc.content.size;
+    const selection = saved ? { from: Math.min(saved.from, size), to: Math.min(saved.to, size) } : 0;
+    editor.chain().setTextSelection(selection).focus(undefined, { scrollIntoView: false }).run();
+
+    if (scroller) {
+      const top = saved?.scroll ?? 0;
+      const restore = () => {
+        if (active) scroller.scrollTop = top;
+      };
+      restore();
+      requestAnimationFrame(restore);
+      document.fonts?.ready.then(restore).catch(() => {});
+    }
+
+    return () => {
+      active = false;
+    };
     // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [chapterId, editor]);
+  }, [editor]);
+
+  useEffect(() => {
+    if (!editor) return;
+    const scroller = editor.view.dom.closest(".editor-pane") as HTMLElement | null;
+    let timer: ReturnType<typeof setTimeout>;
+    const capture = () => {
+      const { from, to } = editor.state.selection;
+      latest.current = { from, to, scroll: scroller?.scrollTop ?? 0 };
+    };
+    const persist = () => {
+      capture();
+      clearTimeout(timer);
+      timer = setTimeout(() => savePosition(bookId, chapterId, latest.current!), 400);
+    };
+    editor.on("selectionUpdate", persist);
+    scroller?.addEventListener("scroll", persist, { passive: true });
+    return () => {
+      clearTimeout(timer);
+      editor.off("selectionUpdate", persist);
+      scroller?.removeEventListener("scroll", persist);
+      if (latest.current) savePosition(bookId, chapterId, latest.current);
+    };
+  }, [editor, bookId, chapterId]);
 
   return <EditorContent editor={editor} className="editor-host" />;
 }

src/editor/positions.ts

@@ -0,0 +1,64 @@
+export interface ChapterPosition {
+  from: number;
+  to: number;
+  scroll: number;
+}
+
+const KEY = "margin-positions";
+
+type Store = Record<string, Record<string, ChapterPosition>>;
+
+function readAll(): Store {
+  try {
+    return JSON.parse(localStorage.getItem(KEY) || "{}") as Store;
+  } catch {
+    return {};
+  }
+}
+
+function write(key: string, value: unknown): void {
+  try {
+    localStorage.setItem(key, JSON.stringify(value));
+  } catch {
+    return;
+  }
+}
+
+export function loadPosition(bookId: string, chapterId: string): ChapterPosition | null {
+  return readAll()[bookId]?.[chapterId] ?? null;
+}
+
+export function savePosition(bookId: string, chapterId: string, position: ChapterPosition): void {
+  const all = readAll();
+  (all[bookId] ||= {})[chapterId] = position;
+  write(KEY, all);
+}
+
+const ACTIVE_KEY = "margin-active-chapter";
+
+function readActive(): Record<string, string> {
+  try {
+    return JSON.parse(localStorage.getItem(ACTIVE_KEY) || "{}") as Record<string, string>;
+  } catch {
+    return {};
+  }
+}
+
+export function loadActiveChapter(bookId: string): string | null {
+  return readActive()[bookId] ?? null;
+}
+
+export function saveActiveChapter(bookId: string, chapterId: string): void {
+  const all = readActive();
+  all[bookId] = chapterId;
+  write(ACTIVE_KEY, all);
+}
+
+export function clearPositions(bookId: string): void {
+  const positions = readAll();
+  const active = readActive();
+  delete positions[bookId];
+  delete active[bookId];
+  write(KEY, positions);
+  write(ACTIVE_KEY, active);
+}

src/export/epub.ts

@@ -1,6 +1,7 @@
 import type { JSONContent } from "@tiptap/core";
 import { invoke } from "@tauri-apps/api/core";
 import { type Book, type FigurePlacement, TRIM_DIMS, FIGURE_WIDTH, bodyNumber, chapterKind, isResizablePlacement } from "../model/book";
+import { fontStack, fontsUsed } from "../model/fonts";
 
 export interface EpubFile {
   path: string;
@@ -25,7 +26,7 @@ function slug(text: string): string {
 
 function imageExtension(dataUrl: string): string {
   const match = /^data:image\/([a-z0-9.+-]+)/i.exec(dataUrl);
-  const kind = (match?.[1] ?? "png").toLowerCase();
+  const kind = (match?.[1] ?? "png").toLowerCase().split("+")[0];
   return kind === "jpeg" ? "jpg" : kind;
 }
 
@@ -38,12 +39,65 @@ function mediaType(path: string): string {
   return "application/octet-stream";
 }
 
+interface FontAssets {
+  files: EpubFile[];
+  faces: string;
+  manifest: string[];
+}
+
+function base64FromBuffer(buffer: ArrayBuffer): string {
+  const bytes = new Uint8Array(buffer);
+  let binary = "";
+  const chunk = 0x8000;
+  for (let i = 0; i < bytes.length; i += chunk) {
+    binary += String.fromCharCode(...bytes.subarray(i, i + chunk));
+  }
+  return btoa(binary);
+}
+
+async function fetchFontBase64(file: string): Promise<string | null> {
+  try {
+    const res = await fetch(`/fonts/${file}`);
+    if (!res.ok) return null;
+    return base64FromBuffer(await res.arrayBuffer());
+  } catch {
+    return null;
+  }
+}
+
+async function loadFontAssets(book: Book): Promise<FontAssets> {
+  const used = fontsUsed(book.settings.fonts).bundled;
+  const files: EpubFile[] = [];
+  const faces: string[] = [];
+  const manifest: string[] = [];
+  let n = 0;
+  for (const font of used) {
+    const variants = [{ file: font.regular, style: "normal" }];
+    if (font.italic) variants.push({ file: font.italic, style: "italic" });
+    for (const variant of variants) {
+      const data = await fetchFontBase64(variant.file);
+      if (!data) continue;
+      const href = `fonts/${variant.file}`;
+      const id = `font-${++n}`;
+      files.push({ path: `OEBPS/${href}`, data, encoding: "base64" });
+      manifest.push(`<item id="${id}" href="${attr(href)}" media-type="font/ttf"/>`);
+      faces.push(
+        `@font-face {\n  font-family: "${font.family}";\n  font-style: ${variant.style};\n  font-weight: ${font.weight};\n  src: url("${href}");\n}`,
+      );
+    }
+  }
+  return { files, faces: faces.join("\n\n"), manifest };
+}
+
 function inline(node: JSONContent): string {
   if (node.type === "text") {
     let text = esc(node.text ?? "");
     const marks = node.marks ?? [];
+    if (marks.some((m) => m.type === "code")) text = `<code>${text}</code>`;
     if (marks.some((m) => m.type === "bold")) text = `<strong>${text}</strong>`;
     if (marks.some((m) => m.type === "italic")) text = `<em>${text}</em>`;
+    if (marks.some((m) => m.type === "strike")) text = `<s>${text}</s>`;
+    if (marks.some((m) => m.type === "underline")) text = `<u>${text}</u>`;
     const href = marks.find((m) => m.type === "link")?.attrs?.href;
     if (href) text = `<a href="${attr(href)}">${text}</a>`;
     return text;
@@ -56,10 +110,10 @@ function inlines(content: JSONContent[] = []): string {
   return content.map(inline).join("");
 }
 
-function listItem(item: JSONContent): string {
+function listItem(item: JSONContent, paths: Map<string, string>): string {
   const inner = (item.content ?? [])
-    .filter((c) => c.type === "paragraph")
+    .map((child) => block(child, paths))
-    .map((p) => inlines(p.content))
+    .filter((s) => s.length > 0)
     .join("");
   return `<li>${inner}</li>`;
 }
@@ -92,9 +146,9 @@ function block(node: JSONContent, paths: Map<string, string>): string {
     case "blockquote":
       return `<blockquote>${(node.content ?? []).map((n) => block(n, paths)).join("")}</blockquote>`;
     case "bulletList":
-      return `<ul>${(node.content ?? []).map(listItem).join("")}</ul>`;
+      return `<ul>${(node.content ?? []).map((li) => listItem(li, paths)).join("")}</ul>`;
     case "orderedList":
-      return `<ol>${(node.content ?? []).map(listItem).join("")}</ol>`;
+      return `<ol>${(node.content ?? []).map((li) => listItem(li, paths)).join("")}</ol>`;
     case "horizontalRule":
       return `<hr class="scene-break"/>`;
     case "figure":
@@ -237,6 +291,7 @@ function contentOpf(
   chapterIds: string[],
   assetPaths: string[],
   cover: { href: string; mediaType: string },
+  fontManifest: string[],
 ): string {
   const meta = book.metadata;
   const manifest: string[] = [
@@ -244,8 +299,7 @@ function contentOpf(
     `<item id="cover" href="cover.xhtml" media-type="application/xhtml+xml"/>`,
     `<item id="nav" href="nav.xhtml" media-type="application/xhtml+xml" properties="nav"/>`,
     `<item id="css" href="style.css" media-type="text/css"/>`,
-    `<item id="font-regular" href="fonts/Literata-VF.ttf" media-type="font/ttf"/>`,
+    ...fontManifest,
-    `<item id="font-italic" href="fonts/Literata-Italic-VF.ttf" media-type="font/ttf"/>`,
   ];
   chapterIds.forEach((_, i) => {
     manifest.push(
@@ -331,23 +385,9 @@ function chapterXhtml(book: Book, index: number, paths: Map<string, string>): st
 </html>`;
 }
 
-function styleCss(): string {
+function styleCss(book: Book, faces: string): string {
-  return `@font-face {
+  return `${faces ? faces + "\n\n" : ""}html {
-  font-family: "Literata";
+  font-family: ${fontStack(book.settings.fonts.body)};
-  font-style: normal;
-  font-weight: 300 700;
-  src: url("fonts/Literata-VF.ttf");
-}
-
-@font-face {
-  font-family: "Literata";
-  font-style: italic;
-  font-weight: 300 700;
-  src: url("fonts/Literata-Italic-VF.ttf");
-}
-
-html {
-  font-family: "Literata", Georgia, serif;
 }
 
 .cover {
@@ -380,6 +420,7 @@ p[data-indent="true"] {
 }
 
 h1, h2, h3 {
+  font-family: ${fontStack(book.settings.fonts.heading)};
   hyphens: none;
   line-height: 1.25;
   font-weight: 500;
@@ -406,6 +447,11 @@ h2, h3 {
   margin: 0;
 }
 
+code {
+  font-family: "SF Mono", Menlo, Consolas, monospace;
+  font-size: 0.9em;
+}
+
 blockquote {
   margin: 1.2em 1.6em;
   font-style: italic;
@@ -469,7 +515,7 @@ figure.placement-float-top {
 `;
 }
 
-export function bookToEpub(book: Book): EpubFile[] {
+export function bookToEpub(book: Book, fontAssets: FontAssets): EpubFile[] {
   const { assets, paths } = extractFigures(book);
   const cover = buildCover(book);
   const chapterIds = book.chapters.map((c) => c.id);
@@ -480,12 +526,12 @@ export function bookToEpub(book: Book): EpubFile[] {
     { path: "META-INF/container.xml", data: containerXml(), encoding: "utf8" },
     {
       path: "OEBPS/content.opf",
-      data: contentOpf(book, chapterIds, assetPaths, cover),
+      data: contentOpf(book, chapterIds, assetPaths, cover, fontAssets.manifest),
       encoding: "utf8",
     },
     { path: "OEBPS/cover.xhtml", data: coverXhtml(book, cover.href), encoding: "utf8" },
     { path: "OEBPS/nav.xhtml", data: navXhtml(book), encoding: "utf8" },
-    { path: "OEBPS/style.css", data: styleCss(), encoding: "utf8" },
+    { path: "OEBPS/style.css", data: styleCss(book, fontAssets.faces), encoding: "utf8" },
     cover.asset,
   ];
 
@@ -497,12 +543,13 @@ export function bookToEpub(book: Book): EpubFile[] {
     });
   });
 
-  files.push(...assets);
+  files.push(...assets, ...fontAssets.files);
   return files;
 }
 
 export async function buildEpub(book: Book): Promise<Uint8Array> {
-  const files = bookToEpub(book);
+  const fontAssets = await loadFontAssets(book);
+  const files = bookToEpub(book, fontAssets);
   const buf = await invoke<ArrayBuffer>("package_epub", { files });
   return new Uint8Array(buf);
 }

src/export/exporters.ts

@@ -8,8 +8,8 @@ const PDF = [{ name: "PDF", extensions: ["pdf"] }];
 const EPUB = [{ name: "EPUB", extensions: ["epub"] }];
 
 export async function exportPdf(book: Book): Promise<void> {
-  const { source, images } = bookToPdfInputs(book);
+  const { source, images, fonts } = bookToPdfInputs(book);
-  const bytes = await compilePdf(source, images);
+  const bytes = await compilePdf(source, images, true, fonts);
   await saveBytes(bytes, `${book.metadata.title || "Untitled"}.pdf`, PDF);
 }
 

src/export/run.ts

@@ -1,5 +1,6 @@
 import type { Book } from "../model/book";
 import { exportEpub, exportPdf } from "./exporters";
+import { unsupportedScripts } from "./typst";
 import { useBook } from "../store/useBook";
 import { isDesktop } from "../ipc";
 
@@ -29,6 +30,11 @@ export async function runExport(format: "pdf" | "epub"): Promise<void> {
   await nextPaint();
   try {
     await run(book);
+    if (format === "pdf") {
+      const scripts = unsupportedScripts(book);
+      if (scripts.length)
+        setNotice(`Some ${scripts.join(", ")} characters may not render — the PDF fonts cover Latin scripts only.`);
+    }
   } catch (e) {
     setNotice(`${label} export failed: ${e}`);
   } finally {

src/export/typst.ts

@@ -1,7 +1,18 @@
 import type { JSONContent } from "@tiptap/core";
 import { type Book, type FigurePlacement, type TrimSize, FIGURE_WIDTH, bodyNumber, chapterKind, isResizablePlacement } from "../model/book";
+import { fontFamilyName, fontsUsed } from "../model/fonts";
 import type { ImageInput } from "../ipc";
 
+export interface PdfFonts {
+  bundled: string[];
+  system: string[];
+}
+
+function pdfFonts(book: Book): PdfFonts {
+  const used = fontsUsed(book.settings.fonts);
+  return { bundled: used.bundled.map((f) => f.id), system: used.system };
+}
+
 const TRIM: Record<TrimSize, { w: string; h: string }> = {
   "6x9": { w: "6in", h: "9in" },
   "5.5x8.5": { w: "5.5in", h: "8.5in" },
@@ -10,27 +21,32 @@ const TRIM: Record<TrimSize, { w: string; h: string }> = {
 };
 
 const INLINE_SPECIAL = /[\\#$*_`<>@~[\]]/g;
+const LINE_SEPARATORS = /[\n\r\v\f\u2028\u2029]+/g;
 
 function esc(text: string): string {
-  return text.replace(INLINE_SPECIAL, (m) => "\\" + m);
+  return text.replace(LINE_SEPARATORS, " ").replace(INLINE_SPECIAL, (m) => "\\" + m);
 }
 
-function guardLineStart(line: string): string {
+function guardLineStart(text: string): string {
-  if (/^[=\-+/]/.test(line)) return "\\" + line;
+  if (/^[=\-+/]/.test(text)) return "\\" + text;
-  if (/^\d+\./.test(line)) return line.replace(".", "\\.");
+  if (/^\d+\./.test(text)) return text.replace(".", "\\.");
-  return line;
+  return text;
 }
 
 function str(value: string): string {
   return JSON.stringify(value);
 }
 
-function inline(node: JSONContent): string {
+function inline(node: JSONContent, atLineStart: boolean): string {
   if (node.type === "text") {
-    let text = esc(node.text ?? "");
     const marks = node.marks ?? [];
+    if (marks.some((m) => m.type === "code")) return `#raw(${str(node.text ?? "")})`;
+    let text = esc(node.text ?? "");
+    if (atLineStart) text = guardLineStart(text);
     if (marks.some((m) => m.type === "italic")) text = `#emph[${text}]`;
     if (marks.some((m) => m.type === "bold")) text = `#strong[${text}]`;
+    if (marks.some((m) => m.type === "strike")) text = `#strike[${text}]`;
+    if (marks.some((m) => m.type === "underline")) text = `#underline[${text}]`;
     const href = marks.find((m) => m.type === "link")?.attrs?.href;
     if (href) text = `#link(${str(href)})[${text}]`;
     return text;
@@ -39,15 +55,15 @@ function inline(node: JSONContent): string {
   return "";
 }
 
-function inlines(content: JSONContent[] = []): string {
+function inlines(content: JSONContent[] = [], atLineStart = false): string {
-  return content.map(inline).join("");
+  return content.map((node, i) => inline(node, atLineStart && i === 0)).join("");
 }
 
-function listItem(item: JSONContent): string {
+function listItem(item: JSONContent, paths: Map<string, string>): string {
-  return (item.content ?? [])
+  const parts = (item.content ?? [])
-    .filter((c) => c.type === "paragraph")
+    .map((child) => block(child, paths))
-    .map((p) => inlines(p.content))
+    .filter((s) => s.length > 0);
-    .join(" ");
+  return `[${parts.join("\n\n")}]`;
 }
 
 function figure(node: JSONContent, paths: Map<string, string>): string {
@@ -59,7 +75,7 @@ function figure(node: JSONContent, paths: Map<string, string>): string {
   }
   const placed = placement as FigurePlacement;
   const width = (isResizablePlacement(placed) ? node.attrs?.width : null) ?? FIGURE_WIDTH[placed] ?? 100;
-  const caption = node.attrs?.caption ? `, caption: [${esc(node.attrs.caption)}]` : "";
+  const caption = node.attrs?.caption ? `, caption: [${guardLineStart(esc(node.attrs.caption))}]` : "";
   const float = placement === "float-top" ? ", placement: top" : "";
   return `#figure(image(${str(path)}, width: ${width}%)${caption}${float})`;
 }
@@ -67,18 +83,18 @@ function figure(node: JSONContent, paths: Map<string, string>): string {
 function block(node: JSONContent, paths: Map<string, string>): string {
   switch (node.type) {
     case "paragraph": {
-      const body = guardLineStart(inlines(node.content));
+      const body = inlines(node.content, true);
       if (!body.trim()) return "~";
       return node.attrs?.indent ? `#h(1.3em)${body}` : body;
     }
     case "heading":
-      return `#heading(level: ${node.attrs?.level ?? 2})[${inlines(node.content)}]`;
+      return `#heading(level: ${node.attrs?.level ?? 2})[${inlines(node.content, true)}]`;
     case "blockquote":
       return `#blockquote[${(node.content ?? []).map((n) => block(n, paths)).join("\n\n")}]`;
     case "bulletList":
-      return (node.content ?? []).map((li) => `- ${listItem(li)}`).join("\n");
+      return `#list(${(node.content ?? []).map((li) => listItem(li, paths)).join(", ")})`;
     case "orderedList":
-      return (node.content ?? []).map((li) => `+ ${listItem(li)}`).join("\n");
+      return `#enum(${(node.content ?? []).map((li) => listItem(li, paths)).join(", ")})`;
     case "horizontalRule":
       return "#scenebreak";
     case "figure":
@@ -99,6 +115,8 @@ function preamble(book: Book): string {
   const trim = TRIM[book.settings.trim];
   const meta = book.metadata;
   const bleed = book.settings.bleed ? "0.125in" : "0in";
+  const body = fontFamilyName(book.settings.fonts.body);
+  const heading = fontFamilyName(book.settings.fonts.heading);
   return `#set document(title: ${str(meta.title || "Untitled")}, author: ${str(meta.author)})
 #set page(
   width: ${trim.w} + ${bleed},
@@ -106,9 +124,9 @@ function preamble(book: Book): string {
   margin: (inside: 0.875in, outside: 0.625in + ${bleed}, top: 0.8in + ${bleed}, bottom: 0.8in + ${bleed}),
   binding: left,
 )
-#set text(font: "Literata", size: 11pt, lang: ${str(meta.language || "en")}, hyphenate: true)
+#set text(font: ${str(body)}, size: 11pt, lang: ${str(meta.language || "en")}, hyphenate: true)
 #set par(justify: true, leading: 0.72em, spacing: 0.72em)
-#show heading: set text(font: "Literata", weight: "medium")
+#show heading: set text(font: ${str(heading)}, weight: "medium")
 #show heading.where(level: 1): set text(size: 22pt)
 #show heading.where(level: 2): set block(above: 1.4em, below: 0.6em)
 #show heading.where(level: 3): set block(above: 1.2em, below: 0.5em)
@@ -120,10 +138,10 @@ function preamble(book: Book): string {
 #let titlepage(title, subtitle, author) = {
   v(2.4in)
   align(center)[
-    #text(font: "Literata", size: 30pt, weight: "medium")[#title]
+    #text(font: ${str(heading)}, size: 30pt, weight: "medium")[#title]
     #if subtitle != "" {
       v(0.6em)
-      text(font: "Literata", size: 15pt, style: "italic", fill: rgb("#6b6458"))[#subtitle]
+      text(font: ${str(body)}, size: 15pt, style: "italic", fill: rgb("#6b6458"))[#subtitle]
     }
     #if author != "" {
       v(1.7em)
@@ -159,7 +177,7 @@ function preamble(book: Book): string {
   set par(justify: false, first-line-indent: 0pt)
   block(below: 2em)[
     #show heading: set block(above: 0pt, below: 0pt)
-    #heading(level: 1, numbering: none, outlined: false, bookmarked: true)[#text(font: "Literata", size: 24pt, weight: "medium")[Contents]]
+    #heading(level: 1, numbering: none, outlined: false, bookmarked: true)[#text(font: ${str(heading)}, size: 24pt, weight: "medium")[Contents]]
   ]
   context {
     let items = query(<chap>).filter(it => it.value.toc != false)
@@ -188,20 +206,22 @@ function preamble(book: Book): string {
 
 function imageExtension(dataUrl: string): string {
   const match = /^data:image\/([a-z0-9.+-]+)/i.exec(dataUrl);
-  const kind = (match?.[1] ?? "png").toLowerCase();
+  const kind = (match?.[1] ?? "png").toLowerCase().split("+")[0];
   return kind === "jpeg" ? "jpg" : kind;
 }
 
 function coverBlock(book: Book, coverPath?: string): string {
   const c = book.cover;
   const meta = book.metadata;
+  const body = fontFamilyName(book.settings.fonts.body);
+  const heading = fontFamilyName(book.settings.fonts.heading);
 
   if (c.kind === "image" && coverPath) {
     return `#page(margin: 0pt, numbering: none)[#image(${str(coverPath)}, width: 100%, height: 100%, fit: "cover")]`;
   }
 
   const subtitle = meta.subtitle
-    ? `#v(0.55em)\n  #text(font: "Literata", size: 14pt, style: "italic")[${esc(meta.subtitle)}]`
+    ? `#v(0.55em)\n  #text(font: ${str(body)}, size: 14pt, style: "italic")[${esc(meta.subtitle)}]`
     : "";
   const author = meta.author
     ? `#v(1fr)\n  #text(font: "Hanken Grotesk", size: 11pt, weight: "semibold", tracking: 0.24em)[#upper[${esc(meta.author)}]]\n  #v(0.55in)`
@@ -211,7 +231,7 @@ function coverBlock(book: Book, coverPath?: string): string {
   #set align(center)
   #set text(fill: rgb(${str(c.ink)}))
   #v(1fr)
-  #text(font: "Literata", size: 30pt, weight: "medium")[${esc(meta.title || "Untitled")}]
+  #text(font: ${str(heading)}, size: 30pt, weight: "medium")[${esc(meta.title || "Untitled")}]
   #v(0.5em)
   #line(length: 16%, stroke: 0.6pt + rgb(${str(c.ink)}))
   ${subtitle}
@@ -251,6 +271,34 @@ export function extractImages(book: Book): { images: ImageInput[]; paths: Map<st
   return collectImages(book.chapters.map((chapter) => chapter.content));
 }
 
+const SCRIPT_RANGES: { label: string; test: RegExp }[] = [
+  { label: "CJK", test: /[぀-鿿가-힯豈-﫿]/u },
+  { label: "Arabic", test: /[؀-ۿݐ-ݿ]/u },
+  { label: "Hebrew", test: /[֐-׿]/u },
+  { label: "Devanagari", test: /[ऀ-ॿ]/u },
+  { label: "Thai", test: /[฀-๿]/u },
+  { label: "emoji", test: /[☀-➿]|[\u{1f000}-\u{1faff}]/u },
+];
+
+function collectText(book: Book): string {
+  const parts = [book.metadata.title, book.metadata.subtitle, book.metadata.author];
+  const visit = (node: JSONContent) => {
+    if (node.type === "text" && node.text) parts.push(node.text);
+    if (node.attrs?.caption) parts.push(String(node.attrs.caption));
+    (node.content ?? []).forEach(visit);
+  };
+  book.chapters.forEach((chapter) => {
+    parts.push(chapter.title);
+    visit(chapter.content);
+  });
+  return parts.join("\n");
+}
+
+export function unsupportedScripts(book: Book): string[] {
+  const text = collectText(book);
+  return SCRIPT_RANGES.filter((s) => s.test.test(text)).map((s) => s.label);
+}
+
 function cleanTitle(title: string): string {
   return (title || "")
     .replace(/[\u0000-\u001f\u007f-\u009f\u2028\u2029]+/g, " ")
@@ -301,16 +349,16 @@ export function bookToTypst(book: Book, paths: Map<string, string> = new Map(),
   return `${preamble(book)}\n\n${cover}\n\n${front}\n\n${body}\n`;
 }
 
-export function bookToPdfInputs(book: Book): { source: string; images: ImageInput[] } {
+export function bookToPdfInputs(book: Book): { source: string; images: ImageInput[]; fonts: PdfFonts } {
   const { images, paths } = extractImages(book);
   const coverPath = pushCoverImage(book, images);
-  return { source: bookToTypst(book, paths, coverPath), images };
+  return { source: bookToTypst(book, paths, coverPath), images, fonts: pdfFonts(book) };
 }
 
-export function coverToPdfInputs(book: Book): { source: string; images: ImageInput[] } {
+export function coverToPdfInputs(book: Book): { source: string; images: ImageInput[]; fonts: PdfFonts } {
   const images: ImageInput[] = [];
   const coverPath = pushCoverImage(book, images);
-  return { source: `${preamble(book)}\n\n${coverBlock(book, coverPath)}\n`, images };
+  return { source: `${preamble(book)}\n\n${coverBlock(book, coverPath)}\n`, images, fonts: pdfFonts(book) };
 }
 
 function chapterToTypst(book: Book, index: number, paths: Map<string, string>): string {
@@ -325,8 +373,8 @@ ${chapterBody(book.chapters[index].content, paths)}
 `;
 }
 
-export function chapterToPdfInputs(book: Book, index: number): { source: string; images: ImageInput[] } {
+export function chapterToPdfInputs(book: Book, index: number): { source: string; images: ImageInput[]; fonts: PdfFonts } {
   const chapter = book.chapters[index];
   const { images, paths } = collectImages([chapter.content]);
-  return { source: chapterToTypst(book, index, paths), images };
+  return { source: chapterToTypst(book, index, paths), images, fonts: pdfFonts(book) };
 }

src/import/epub.ts

@@ -1,7 +1,8 @@
 import { invoke } from "@tauri-apps/api/core";
 import { open } from "@tauri-apps/plugin-dialog";
 import type { JSONContent } from "@tiptap/core";
-import { type Book, type BookMetadata, type Chapter, createCover } from "../model/book";
+import { type Book, type BookMetadata, type Chapter, type Cover, createCover } from "../model/book";
+import { DEFAULT_FONTS } from "../model/fonts";
 
 export interface RawFile {
   path: string;
@@ -9,7 +10,7 @@ export interface RawFile {
   encoding: "utf8" | "base64";
 }
 
-type Mark = { type: string };
+type Mark = { type: string; attrs?: Record<string, unknown> };
 
 const BLOCK_TAGS = new Set([
   "p", "div", "section", "article", "main", "header", "footer", "aside",
@@ -81,8 +82,8 @@ function hasMark(marks: Mark[], type: string): boolean {
   return marks.some((m) => m.type === type);
 }
 
-function addMark(marks: Mark[], type: string): Mark[] {
+function addMark(marks: Mark[], type: string, attrs?: Record<string, unknown>): Mark[] {
-  return hasMark(marks, type) ? marks : [...marks, { type }];
+  return hasMark(marks, type) ? marks : [...marks, attrs ? { type, attrs } : { type }];
 }
 
 function collectInline(node: Node, marks: Mark[], out: JSONContent[]): void {
@@ -102,6 +103,15 @@ function collectInline(node: Node, marks: Mark[], out: JSONContent[]): void {
       collectInline(el, addMark(marks, "bold"), out);
     } else if (tag === "em" || tag === "i") {
       collectInline(el, addMark(marks, "italic"), out);
+    } else if (tag === "u") {
+      collectInline(el, addMark(marks, "underline"), out);
+    } else if (tag === "s" || tag === "strike" || tag === "del") {
+      collectInline(el, addMark(marks, "strike"), out);
+    } else if (tag === "code") {
+      collectInline(el, addMark(marks, "code"), out);
+    } else if (tag === "a") {
+      const href = el.getAttribute("href");
+      collectInline(el, href ? addMark(marks, "link", { href }) : marks, out);
     } else if (!BLOCK_TAGS.has(tag)) {
       collectInline(el, marks, out);
     }
@@ -137,7 +147,7 @@ function meaningful(inline: JSONContent[]): boolean {
 
 function imgFigure(img: Element, caption = ""): JSONContent[] {
   const src = img.getAttribute("src");
-  if (!src || !src.startsWith("data:")) return [];
+  if (src && src.startsWith("data:")) {
     return [
       {
         type: "figure",
@@ -145,6 +155,16 @@ function imgFigure(img: Element, caption = ""): JSONContent[] {
       },
     ];
   }
+  const alt = (img.getAttribute("alt") ?? "").trim();
+  return alt ? [{ type: "paragraph", content: [{ type: "text", text: alt }] }] : [];
+}
+
+function svgFigure(el: Element): JSONContent[] {
+  const markup = el.outerHTML;
+  if (!markup) return [];
+  const src = `data:image/svg+xml;base64,${btoa(unescape(encodeURIComponent(markup)))}`;
+  return [{ type: "figure", attrs: { src, alt: "", caption: "", placement: "full-width" } }];
+}
 
 function figureFrom(el: Element): JSONContent[] {
   const img = el.querySelector("img");
@@ -165,18 +185,35 @@ function hasBlockChild(el: Element): boolean {
   return Array.from(el.children).some((c) => BLOCK_TAGS.has(c.localName.toLowerCase()));
 }
 
-function listItems(el: Element): JSONContent[] {
+function listItems(el: Element, depth: number): JSONContent[] {
   const items: JSONContent[] = [];
   Array.from(el.children)
     .filter((c) => c.localName.toLowerCase() === "li")
     .forEach((li) => {
-      const content = blocksFrom(li);
+      const content = blocksFrom(li, depth + 1);
       items.push({ type: "listItem", content: content.length ? content : [{ type: "paragraph" }] });
     });
   return items;
 }
 
-function blockFromElement(el: Element): JSONContent[] {
+function tableBlocks(el: Element): JSONContent[] {
+  const out: JSONContent[] = [];
+  Array.from(el.querySelectorAll("tr")).forEach((tr) => {
+    const content: JSONContent[] = [];
+    Array.from(tr.children)
+      .filter((c) => c.localName.toLowerCase() === "td" || c.localName.toLowerCase() === "th")
+      .forEach((cell) => {
+        const inline = inlineOf(cell);
+        if (!meaningful(inline)) return;
+        if (content.length) content.push({ type: "text", text: "  ·  " });
+        content.push(...inline);
+      });
+    if (meaningful(content)) out.push({ type: "paragraph", content });
+  });
+  return out;
+}
+
+function blockFromElement(el: Element, depth: number): JSONContent[] {
   const tag = el.localName.toLowerCase();
   switch (tag) {
     case "p":
@@ -192,15 +229,15 @@ function blockFromElement(el: Element): JSONContent[] {
       return meaningful(content) ? [{ type: "heading", attrs: { level }, content }] : [];
     }
     case "blockquote": {
-      const inner = blocksFrom(el);
+      const inner = blocksFrom(el, depth + 1);
       return [{ type: "blockquote", content: inner.length ? inner : [{ type: "paragraph" }] }];
     }
     case "ul": {
-      const items = listItems(el);
+      const items = listItems(el, depth);
       return items.length ? [{ type: "bulletList", content: items }] : [];
     }
     case "ol": {
-      const items = listItems(el);
+      const items = listItems(el, depth);
       return items.length ? [{ type: "orderedList", content: items }] : [];
     }
     case "hr":
@@ -209,22 +246,27 @@ function blockFromElement(el: Element): JSONContent[] {
       return figureFrom(el);
     case "img":
       return imgFigure(el);
+    case "svg":
+      return svgFigure(el);
+    case "table":
+      return tableBlocks(el);
     case "script":
     case "style":
       return [];
     default:
-      return hasBlockChild(el) ? blocksFrom(el) : paragraphAndFigures(el);
+      return hasBlockChild(el) ? blocksFrom(el, depth + 1) : paragraphAndFigures(el);
   }
 }
 
-function blocksFrom(parent: Node): JSONContent[] {
+function blocksFrom(parent: Node, depth = 0): JSONContent[] {
+  if (depth > 64) return [];
   const out: JSONContent[] = [];
   parent.childNodes.forEach((child) => {
     if (child.nodeType === 3) {
       const text = (child.nodeValue ?? "").replace(/\s+/g, " ").trim();
       if (text !== "") out.push({ type: "paragraph", content: [{ type: "text", text }] });
     } else if (child.nodeType === 1) {
-      out.push(...blockFromElement(child as Element));
+      out.push(...blockFromElement(child as Element, depth));
     }
   });
   return out;
@@ -234,6 +276,41 @@ function headingText(node: JSONContent): string {
   return (node.content ?? []).map((n) => n.text ?? "").join("").trim();
 }
 
+function isbnChecksum(s: string): boolean {
+  if (s.length === 10) {
+    let sum = 0;
+    for (let i = 0; i < 10; i++) {
+      const v = s[i] === "X" ? 10 : Number(s[i]);
+      if (Number.isNaN(v) || (s[i] === "X" && i !== 9)) return false;
+      sum += v * (10 - i);
+    }
+    return sum % 11 === 0;
+  }
+  if (s.length === 13 && /^\d{13}$/.test(s)) {
+    let sum = 0;
+    for (let i = 0; i < 13; i++) sum += Number(s[i]) * (i % 2 === 0 ? 1 : 3);
+    return sum % 10 === 0;
+  }
+  return false;
+}
+
+function findIsbn(opf: Document): string {
+  const ids = Array.from(opf.getElementsByTagName("*")).filter((el) => el.localName === "identifier");
+  const ranked = ids
+    .map((el) => ({
+      text: el.textContent ?? "",
+      tagged:
+        /isbn/i.test(el.getAttribute("opf:scheme") || el.getAttribute("scheme") || "") ||
+        /urn:isbn:/i.test(el.textContent ?? ""),
+    }))
+    .sort((a, b) => Number(b.tagged) - Number(a.tagged));
+  for (const { text } of ranked) {
+    const cleaned = text.replace(/[^0-9Xx]/g, "").toUpperCase();
+    if (isbnChecksum(cleaned)) return cleaned;
+  }
+  return "";
+}
+
 interface ManifestItem {
   href: string;
   mediaType: string;
@@ -317,6 +394,11 @@ function readNavTitles(
   return titles;
 }
 
+function fileToDataUri(file: RawFile, mime: string): string {
+  const data = file.encoding === "base64" ? file.data : btoa(unescape(encodeURIComponent(file.data)));
+  return `data:${mime};base64,${data}`;
+}
+
 function resolveImages(
   doc: Document,
   baseDir: string,
@@ -335,12 +417,29 @@ function resolveImages(
       img.removeAttribute("src");
       return;
     }
-    const mime = mimeByPath.get(resolved) || mimeFromExt(resolved);
+    img.setAttribute("src", fileToDataUri(file, mimeByPath.get(resolved) || mimeFromExt(resolved)));
-    const data = file.encoding === "base64" ? file.data : btoa(unescape(encodeURIComponent(file.data)));
-    img.setAttribute("src", `data:${mime};base64,${data}`);
   });
 }
 
+function findCover(
+  opf: Document,
+  manifest: Map<string, ManifestItem>,
+  byPath: Map<string, RawFile>,
+): Cover {
+  let item = Array.from(manifest.values()).find((m) => m.properties.split(/\s+/).includes("cover-image"));
+  if (!item) {
+    const metaCover = Array.from(opf.getElementsByTagName("*")).find(
+      (el) => el.localName === "meta" && el.getAttribute("name") === "cover",
+    );
+    const id = metaCover?.getAttribute("content");
+    if (id) item = manifest.get(id);
+  }
+  if (!item) return createCover();
+  const file = byPath.get(normalize(item.href));
+  if (!file) return createCover();
+  return { ...createCover(), kind: "image", image: fileToDataUri(file, item.mediaType || mimeFromExt(item.href)) };
+}
+
 function buildChapter(
   file: RawFile,
   baseDir: string,
@@ -394,18 +493,21 @@ export function filesToBook(files: RawFile[], fallbackName = "Imported book"): B
   spine.forEach((item, i) => {
     const file = byPath.get(normalize(item.href));
     if (!file) return;
+    try {
       chapters.push(
         buildChapter(file, dirOf(item.href), navTitles.get(item.href), i, byPath, manifest),
       );
+    } catch {
+      return;
+    }
   });
   if (!chapters.length) throw new Error("Not a valid EPUB: no readable chapters found.");
 
-  const identifier = localText(opf, "identifier");
   const metadata: BookMetadata = {
     title: localText(opf, "title") || fallbackName,
     subtitle: "",
     author: localText(opf, "creator"),
-    isbn: /\d{9,13}/.test(identifier) ? identifier.replace(/[^0-9Xx]/g, "") : "",
+    isbn: findIsbn(opf),
     language: localText(opf, "language") || "en",
   };
 
@@ -414,8 +516,8 @@ export function filesToBook(files: RawFile[], fallbackName = "Imported book"): B
     id: crypto.randomUUID(),
     metadata,
     theme: "quiet-press",
-    settings: { trim: "6x9", bleed: true },
+    settings: { trim: "6x9", bleed: true, fonts: DEFAULT_FONTS },
-    cover: createCover(),
+    cover: findCover(opf, manifest, byPath),
     chapters,
   };
 }

src/ipc.ts

@@ -7,7 +7,32 @@ export interface ImageInput {
   data: string;
 }
 
-export async function compilePdf(source: string, images: ImageInput[] = []): Promise<Uint8Array> {
+export interface PdfFonts {
-  const buffer = await invoke<ArrayBuffer>("compile_pdf", { source, images });
+  bundled: string[];
+  system: string[];
+}
+
+export async function compilePdf(
+  source: string,
+  images: ImageInput[] = [],
+  emitWarnings = false,
+  fonts: PdfFonts = { bundled: [], system: [] },
+): Promise<Uint8Array> {
+  const buffer = await invoke<ArrayBuffer>("compile_pdf", {
+    source,
+    images,
+    emitWarnings,
+    bundledFonts: fonts.bundled,
+    systemFonts: fonts.system,
+  });
   return new Uint8Array(buffer);
 }
+
+export async function listSystemFonts(): Promise<string[]> {
+  if (!isDesktop) return [];
+  try {
+    return await invoke<string[]>("list_system_fonts");
+  } catch {
+    return [];
+  }
+}

src/library.ts

@@ -1,11 +1,12 @@
 import { invoke } from "@tauri-apps/api/core";
 import { isDesktop } from "./ipc";
-import { type Book, createBook, starterBook } from "./model/book";
+import { type Book, SCHEMA_VERSION, createBook, schemaVersion, starterBook } from "./model/book";
 
 export interface BookSummary {
   id: string;
   title: string;
   author: string;
+  corrupt?: boolean;
 }
 
 export async function listBooks(): Promise<BookSummary[]> {
@@ -15,7 +16,16 @@ export async function listBooks(): Promise<BookSummary[]> {
 
 export async function loadBook(id: string): Promise<Book> {
   const contents = await invoke<string>("load_book", { id });
-  return JSON.parse(contents) as Book;
+  let book: Book;
+  try {
+    book = JSON.parse(contents) as Book;
+  } catch {
+    throw new Error("the book file is corrupt or unreadable");
+  }
+  if (schemaVersion(book.schema) > SCHEMA_VERSION) {
+    throw new Error("this book was made with a newer version of Margin; update the app to open it");
+  }
+  return book;
 }
 
 export async function saveBook(book: Book): Promise<void> {
@@ -35,3 +45,18 @@ export function newBook(): Book {
 export function exampleBook(): Book {
   return starterBook();
 }
+
+export async function createAndOpenBook(
+  open: (book: Book) => void,
+  onError?: (message: string) => void,
+): Promise<void> {
+  const book = newBook();
+  if (isDesktop) {
+    try {
+      await saveBook(book);
+    } catch (e) {
+      onError?.(`Could not create book: ${e}`);
+    }
+  }
+  open(book);
+}

src/model/book.ts

@@ -1,4 +1,5 @@
 import type { JSONContent } from "@tiptap/core";
+import { type BookFonts, DEFAULT_FONTS } from "./fonts";
 
 export type TrimSize = "6x9" | "5.5x8.5" | "5x8" | "a5";
 export type FigurePlacement = "inline" | "full-width" | "full-page" | "float-top";
@@ -24,6 +25,7 @@ export interface BookMetadata {
 export interface BookSettings {
   trim: TrimSize;
   bleed: boolean;
+  fonts: BookFonts;
 }
 
 export type CoverKind = "default" | "image";
@@ -115,6 +117,14 @@ export interface Book {
   chapters: Chapter[];
 }
 
+export const SCHEMA_VERSION = 1;
+
+export function schemaVersion(schema: unknown): number {
+  if (typeof schema !== "string") return 0;
+  const match = /^margin\/(\d+)$/.exec(schema);
+  return match ? Number(match[1]) : 0;
+}
+
 function paragraph(text: string): JSONContent {
   return { type: "paragraph", content: [{ type: "text", text }] };
 }
@@ -140,11 +150,19 @@ export function createCover(): Cover {
   return { kind: "default", image: "", bg: COVER_PALETTES[0].bg, ink: COVER_PALETTES[0].ink };
 }
 
+const DEFAULT_METADATA: BookMetadata = { title: "Untitled", subtitle: "", author: "", isbn: "", language: "en" };
+const DEFAULT_SETTINGS: BookSettings = { trim: "6x9", bleed: true, fonts: DEFAULT_FONTS };
+
 export function normalizeBook(book: Book): Book {
+  const chapters = (Array.isArray(book.chapters) ? book.chapters : []).filter(Boolean);
   return {
     ...book,
+    metadata: { ...DEFAULT_METADATA, ...book.metadata },
+    settings: { ...DEFAULT_SETTINGS, ...book.settings, fonts: { ...DEFAULT_FONTS, ...book.settings?.fonts } },
     cover: book.cover ? { ...createCover(), ...book.cover } : createCover(),
-    chapters: book.chapters.map((c) => (c.updatedAt ? c : { ...c, updatedAt: Date.now() })),
+    chapters: (chapters.length ? chapters : [createChapter()]).map((c) =>
+      c.updatedAt ? c : { ...c, updatedAt: Date.now() },
+    ),
   };
 }
 
@@ -152,9 +170,9 @@ export function createBook(): Book {
   return {
     schema: "margin/1",
     id: crypto.randomUUID(),
-    metadata: { title: "Untitled", subtitle: "", author: "", isbn: "", language: "en" },
+    metadata: { ...DEFAULT_METADATA },
     theme: "quiet-press",
-    settings: { trim: "6x9", bleed: true },
+    settings: { ...DEFAULT_SETTINGS },
     cover: createCover(),
     chapters: [createChapter("Chapter One")],
   };

src/model/fonts.ts

@@ -0,0 +1,106 @@
+export type FontCategory = "serif" | "sans" | "display";
+
+export interface BundledFont {
+  id: string;
+  label: string;
+  family: string;
+  category: FontCategory;
+  regular: string;
+  italic?: string;
+  weight: string;
+}
+
+export const BUNDLED_FONTS: BundledFont[] = [
+  { id: "literata", label: "Literata", family: "Literata", category: "serif", regular: "Literata-VF.ttf", italic: "Literata-Italic-VF.ttf", weight: "200 900" },
+  { id: "eb-garamond", label: "EB Garamond", family: "EB Garamond", category: "serif", regular: "EBGaramond-VF.ttf", italic: "EBGaramond-Italic-VF.ttf", weight: "400 800" },
+  { id: "lora", label: "Lora", family: "Lora", category: "serif", regular: "Lora-VF.ttf", italic: "Lora-Italic-VF.ttf", weight: "400 700" },
+  { id: "source-serif", label: "Source Serif 4", family: "Source Serif 4", category: "serif", regular: "SourceSerif4-VF.ttf", italic: "SourceSerif4-Italic-VF.ttf", weight: "200 900" },
+  { id: "fraunces", label: "Fraunces", family: "Fraunces", category: "display", regular: "Fraunces-VF.ttf", italic: "Fraunces-Italic-VF.ttf", weight: "100 900" },
+  { id: "hanken", label: "Hanken Grotesk", family: "Hanken Grotesk", category: "sans", regular: "HankenGrotesk-VF.ttf", italic: "HankenGrotesk-Italic-VF.ttf", weight: "100 900" },
+];
+
+export type FontRef =
+  | { kind: "bundled"; id: string }
+  | { kind: "system"; family: string };
+
+export interface BookFonts {
+  body: FontRef;
+  heading: FontRef;
+}
+
+export interface FontPairing {
+  id: string;
+  label: string;
+  body: FontRef;
+  heading: FontRef;
+}
+
+const bundled = (id: string): FontRef => ({ kind: "bundled", id });
+
+export const FONT_PAIRINGS: FontPairing[] = [
+  { id: "quiet-press", label: "Quiet Press", body: bundled("literata"), heading: bundled("literata") },
+  { id: "classic", label: "Classic", body: bundled("eb-garamond"), heading: bundled("eb-garamond") },
+  { id: "editorial", label: "Editorial", body: bundled("source-serif"), heading: bundled("fraunces") },
+  { id: "modern", label: "Modern", body: bundled("lora"), heading: bundled("hanken") },
+  { id: "contrast", label: "Contrast", body: bundled("literata"), heading: bundled("hanken") },
+];
+
+export const DEFAULT_FONTS: BookFonts = { body: bundled("literata"), heading: bundled("literata") };
+
+const SERIF_FALLBACK = `Georgia, "Times New Roman", serif`;
+const SANS_FALLBACK = `ui-sans-serif, system-ui, -apple-system, sans-serif`;
+
+export function bundledFont(id: string): BundledFont | undefined {
+  return BUNDLED_FONTS.find((f) => f.id === id);
+}
+
+export function encodeRef(ref: FontRef): string {
+  return ref.kind === "bundled" ? `b:${ref.id}` : `s:${ref.family}`;
+}
+
+export function decodeRef(value: string): FontRef {
+  return value.startsWith("s:") ? { kind: "system", family: value.slice(2) } : { kind: "bundled", id: value.slice(2) };
+}
+
+export function fontFamilyName(ref: FontRef): string {
+  if (ref.kind === "system") return ref.family;
+  return bundledFont(ref.id)?.family ?? "Literata";
+}
+
+export function fontLabel(ref: FontRef): string {
+  if (ref.kind === "system") return ref.family;
+  return bundledFont(ref.id)?.label ?? ref.id;
+}
+
+export function fontStack(ref: FontRef): string {
+  if (ref.kind === "bundled") {
+    const font = bundledFont(ref.id);
+    if (!font) return SERIF_FALLBACK;
+    return `"${font.family}", ${font.category === "sans" ? SANS_FALLBACK : SERIF_FALLBACK}`;
+  }
+  return `"${ref.family}", ${SERIF_FALLBACK}`;
+}
+
+export function refsEqual(a: FontRef, b: FontRef): boolean {
+  if (a.kind !== b.kind) return false;
+  return a.kind === "bundled" ? a.id === (b as { id: string }).id : a.family === (b as { family: string }).family;
+}
+
+export function pairingFor(fonts: BookFonts): string | null {
+  const match = FONT_PAIRINGS.find((p) => refsEqual(p.body, fonts.body) && refsEqual(p.heading, fonts.heading));
+  return match?.id ?? null;
+}
+
+export function fontsUsed(fonts: BookFonts): { bundled: BundledFont[]; system: string[] } {
+  const usedBundled = new Map<string, BundledFont>();
+  const usedSystem = new Set<string>();
+  for (const ref of [fonts.body, fonts.heading]) {
+    if (ref.kind === "bundled") {
+      const font = bundledFont(ref.id);
+      if (font) usedBundled.set(font.id, font);
+    } else {
+      usedSystem.add(ref.family);
+    }
+  }
+  return { bundled: [...usedBundled.values()], system: [...usedSystem] };
+}

src/store/useBackup.ts

@@ -0,0 +1,156 @@
+import { create } from "zustand";
+import { openUrl } from "@tauri-apps/plugin-opener";
+import {
+  type BackupStatus,
+  gdriveBackup,
+  gdriveConnect,
+  gdriveDisconnect,
+  gdriveRestore,
+  gdriveStatus,
+} from "../backup";
+import { isDesktop } from "../ipc";
+import { useBook } from "./useBook";
+
+type Phase = "idle" | "connecting" | "working" | "error";
+
+interface BackupState {
+  connected: boolean;
+  email: string | null;
+  lastBackup: number | null;
+  pending: boolean;
+  phase: Phase;
+  error: string | null;
+  authUrl: string | null;
+  settingsOpen: boolean;
+  restoreNonce: number;
+  resolveConnect: ((ok: boolean) => void) | null;
+  apply: (status: BackupStatus) => void;
+  refresh: () => Promise<void>;
+  connect: () => Promise<boolean>;
+  cancelConnect: () => void;
+  handleAuthEvent: (ok: boolean, error: string | null) => Promise<void>;
+  openAuthUrl: () => void;
+  copyAuthUrl: () => Promise<void>;
+  disconnect: () => Promise<void>;
+  backup: (silent?: boolean) => Promise<void>;
+  restore: () => Promise<void>;
+  restoreFromDrive: () => Promise<void>;
+  openSettings: () => void;
+  closeSettings: () => void;
+}
+
+function notify(message: string) {
+  useBook.getState().setNotice(message);
+}
+
+export const useBackup = create<BackupState>((set, get) => ({
+  connected: false,
+  email: null,
+  lastBackup: null,
+  pending: false,
+  phase: "idle",
+  error: null,
+  authUrl: null,
+  settingsOpen: false,
+  restoreNonce: 0,
+  resolveConnect: null,
+  apply: (status) =>
+    set({
+      connected: status.connected,
+      email: status.email,
+      lastBackup: status.lastBackup,
+      pending: status.pending,
+    }),
+  refresh: async () => {
+    if (!isDesktop) return;
+    try {
+      get().apply(await gdriveStatus());
+    } catch {}
+  },
+  connect: () =>
+    new Promise<boolean>((resolve) => {
+      get().resolveConnect?.(false);
+      set({ phase: "connecting", error: null, authUrl: null, resolveConnect: resolve });
+      gdriveConnect()
+        .then((url) => set({ authUrl: url }))
+        .catch((e) => {
+          set({ phase: "error", error: String(e), resolveConnect: null });
+          notify(`Could not connect: ${e}`);
+          resolve(false);
+        });
+    }),
+  cancelConnect: () => {
+    const resolve = get().resolveConnect;
+    set({ phase: "idle", authUrl: null, resolveConnect: null });
+    resolve?.(false);
+  },
+  handleAuthEvent: async (ok, error) => {
+    if (get().phase !== "connecting") return;
+    const resolve = get().resolveConnect;
+    if (ok) {
+      await get().refresh();
+      set({ phase: "idle", authUrl: null, error: null, resolveConnect: null });
+      notify("Connected to Google Drive");
+    } else {
+      set({ phase: "error", authUrl: null, error: error ?? "authorization failed", resolveConnect: null });
+      notify(`Could not connect: ${error ?? "authorization failed"}`);
+    }
+    resolve?.(ok);
+  },
+  openAuthUrl: () => {
+    const url = get().authUrl;
+    if (url) openUrl(url).catch(() => {});
+  },
+  copyAuthUrl: async () => {
+    const url = get().authUrl;
+    if (!url) return;
+    try {
+      await navigator.clipboard.writeText(url);
+      notify("Authorization link copied");
+    } catch {
+      notify("Could not copy the link");
+    }
+  },
+  disconnect: async () => {
+    set({ phase: "working", error: null });
+    try {
+      get().apply(await gdriveDisconnect());
+      set({ phase: "idle" });
+      notify("Disconnected from Google Drive");
+    } catch (e) {
+      set({ phase: "error", error: String(e) });
+      notify(`Could not disconnect: ${e}`);
+    }
+  },
+  backup: async (silent = false) => {
+    if (!get().connected || get().phase === "working") return;
+    set({ phase: "working", error: null });
+    try {
+      const outcome = await gdriveBackup();
+      get().apply(outcome);
+      set({ phase: "idle" });
+      if (!silent) notify(outcome.uploaded > 0 ? "Backed up to Google Drive" : "Nothing new to back up");
+    } catch (e) {
+      set({ phase: "error", error: String(e) });
+      if (!silent) notify(`Backup failed: ${e}`);
+    }
+  },
+  restore: async () => {
+    set({ phase: "working", error: null });
+    try {
+      const result = await gdriveRestore();
+      await get().refresh();
+      set((s) => ({ phase: "idle", restoreNonce: s.restoreNonce + 1 }));
+      notify(result.restored > 0 ? `Restored ${result.restored} file${result.restored === 1 ? "" : "s"}` : "No backups found in Google Drive");
+    } catch (e) {
+      set({ phase: "error", error: String(e) });
+      notify(`Restore failed: ${e}`);
+    }
+  },
+  restoreFromDrive: async () => {
+    const ok = get().connected || (await get().connect());
+    if (ok) await get().restore();
+  },
+  openSettings: () => set({ settingsOpen: true }),
+  closeSettings: () => set({ settingsOpen: false }),
+}));

src/store/useBook.ts

@@ -12,6 +12,9 @@ import {
   createPage,
   normalizeBook,
 } from "../model/book";
+import { loadActiveChapter, saveActiveChapter } from "../editor/positions";
+import { saveBook } from "../library";
+import { applyBookFonts, resetBookFonts } from "../book-style";
 
 export const COVER_ID = "__cover__";
 
@@ -40,7 +43,11 @@ interface BookState {
   markSaved: () => void;
 }
 
-export const useBook = create<BookState>((set) => ({
+function flushOutgoing(book: Book | null, dirty: boolean): void {
+  if (book && dirty) saveBook(book).catch(() => {});
+}
+
+export const useBook = create<BookState>((set, get) => ({
   book: null,
   activeChapterId: "",
   dirty: false,
@@ -49,10 +56,19 @@ export const useBook = create<BookState>((set) => ({
   setExporting: (label) => set({ exporting: label }),
   setNotice: (message) => set({ notice: message }),
   openBook: (book) => {
+    flushOutgoing(get().book, get().dirty);
     const normalized = normalizeBook(book);
-    set({ book: normalized, activeChapterId: normalized.chapters[0]?.id ?? "", dirty: false });
+    const saved = loadActiveChapter(normalized.id);
+    const valid = saved === COVER_ID || normalized.chapters.some((c) => c.id === saved);
+    const activeChapterId = valid ? (saved as string) : normalized.chapters[0]?.id ?? "";
+    applyBookFonts(normalized.settings.fonts);
+    set({ book: normalized, activeChapterId, dirty: false });
+  },
+  closeBook: () => {
+    flushOutgoing(get().book, get().dirty);
+    resetBookFonts();
+    set({ book: null, activeChapterId: "", dirty: false });
   },
-  closeBook: () => set({ book: null, activeChapterId: "", dirty: false }),
   setActiveChapter: (id) => set({ activeChapterId: id }),
   setChapterContent: (id, content) =>
     set((s) =>
@@ -127,8 +143,21 @@ export const useBook = create<BookState>((set) => ({
   setMetadata: (patch) =>
     set((s) => (s.book ? { dirty: true, book: { ...s.book, metadata: { ...s.book.metadata, ...patch } } } : {})),
   setSettings: (patch) =>
-    set((s) => (s.book ? { dirty: true, book: { ...s.book, settings: { ...s.book.settings, ...patch } } } : {})),
+    set((s) => {
+      if (!s.book) return {};
+      const book = { ...s.book, settings: { ...s.book.settings, ...patch } };
+      if (patch.fonts) applyBookFonts(book.settings.fonts);
+      return { dirty: true, book };
+    }),
   setCover: (patch) =>
     set((s) => (s.book ? { dirty: true, book: { ...s.book, cover: { ...s.book.cover, ...patch } } } : {})),
   markSaved: () => set({ dirty: false }),
 }));
+
+let lastActive = "";
+useBook.subscribe((s) => {
+  if (s.book && s.activeChapterId && s.activeChapterId !== lastActive) {
+    lastActive = s.activeChapterId;
+    saveActiveChapter(s.book.id, s.activeChapterId);
+  }
+});

src/store/usePreviewMode.ts

@@ -0,0 +1,15 @@
+import { create } from "zustand";
+import { type PreviewMode, initialPreviewMode, persistPreviewMode } from "../devices";
+
+interface PreviewState {
+  mode: PreviewMode;
+  setMode: (mode: PreviewMode) => void;
+}
+
+export const usePreviewMode = create<PreviewState>((set) => ({
+  mode: initialPreviewMode(),
+  setMode: (mode) => {
+    persistPreviewMode(mode);
+    set({ mode });
+  },
+}));

src/styles/app.css

@@ -427,6 +427,7 @@ body.resizing {
 }
 
 .chapter-title {
+  font-family: var(--font-heading);
   font-weight: 500;
   font-size: 31px;
   line-height: 1.16;
@@ -434,6 +435,10 @@ body.resizing {
   margin: 15px 0 0;
 }
 
+.prose :is(h1, h2, h3) {
+  font-family: var(--font-heading);
+}
+
 .prose p {
   font-size: 19px;
   line-height: 1.68;
@@ -565,11 +570,15 @@ body.resizing {
 }
 
 .page .p-title {
-  font-family: var(--font-book);
+  font-family: var(--font-heading);
   font-size: 12px;
   margin-top: 5px;
 }
 
+.page :is(h2, h3) {
+  font-family: var(--font-heading);
+}
+
 .page p {
   font-family: var(--font-book);
   font-size: 6.6px;
@@ -620,7 +629,7 @@ body.resizing {
   border: 0;
   background: transparent;
   text-align: center;
-  font-family: var(--font-book);
+  font-family: var(--font-heading);
   font-weight: 500;
   font-size: 31px;
   line-height: 1.16;
@@ -660,6 +669,87 @@ body.resizing {
   accent-color: var(--ink-soft);
 }
 
+.font-presets {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 8px;
+}
+
+.font-preset {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 5px;
+  padding: 9px 12px;
+  min-width: 70px;
+  border: 1px solid var(--line-strong);
+  border-radius: var(--r-md);
+  background: var(--raised);
+  cursor: pointer;
+  transition: border-color 120ms var(--ease), box-shadow 120ms var(--ease);
+}
+
+.font-preset:hover {
+  border-color: var(--ink-faint);
+}
+
+.font-preset[data-on="true"] {
+  border-color: var(--accent);
+  box-shadow: inset 0 0 0 1px var(--accent);
+}
+
+.font-preset-demo {
+  font-size: 23px;
+  line-height: 1;
+  color: var(--ink);
+}
+
+.font-preset-name {
+  font-family: var(--font-ui);
+  font-size: var(--t-1);
+  color: var(--ink-soft);
+}
+
+.font-advanced {
+  align-self: flex-start;
+  margin-top: 4px;
+  padding: 0;
+  background: none;
+  border: 0;
+  font-family: var(--font-ui);
+  font-size: var(--t-2);
+  color: var(--accent);
+  cursor: pointer;
+  text-decoration: underline;
+  text-underline-offset: 2px;
+}
+
+.font-note {
+  margin: 0;
+  font-family: var(--font-ui);
+  font-size: var(--t-1);
+  line-height: 1.5;
+  color: var(--ink-faint);
+}
+
+.font-sample {
+  padding: 15px 17px;
+  border: 1px solid var(--line);
+  border-radius: var(--r-md);
+  background: var(--paper);
+  color: var(--ink);
+  font-size: 15px;
+  line-height: 1.6;
+}
+
+.font-sample-title {
+  display: block;
+  font-size: 21px;
+  font-weight: 500;
+  line-height: 1.2;
+  margin-bottom: 6px;
+}
+
 .editor-host,
 .ProseMirror {
   outline: none;
@@ -1167,6 +1257,10 @@ body.resizing {
 
 .library-head {
   height: 44px;
+  display: flex;
+  align-items: center;
+  justify-content: flex-end;
+  padding: 0 14px;
 }
 
 .shelf {
@@ -1209,6 +1303,16 @@ body.resizing {
   box-shadow: 0 4px 10px rgba(35, 32, 27, 0.1), 0 20px 38px rgba(35, 32, 27, 0.13);
 }
 
+.card-corrupt {
+  cursor: default;
+  opacity: 0.65;
+  border-style: dashed;
+}
+
+.card-corrupt:hover {
+  transform: none;
+}
+
 .card-title {
   font-family: var(--font-book);
   font-size: 20px;
@@ -1422,7 +1526,7 @@ body.resizing {
 }
 
 .cover-title {
-  font-family: var(--font-book);
+  font-family: var(--font-heading);
   font-weight: 500;
   font-size: 9.5cqw;
   line-height: 1.08;
@@ -1992,3 +2096,361 @@ body.resizing {
   background: var(--accent-wash);
   color: var(--ink);
 }
+
+.device-stage {
+  max-width: 420px;
+  margin: 0 auto;
+  padding-block: 6px;
+  container-type: inline-size;
+}
+
+.device-frame {
+  --dv-scale: calc(100cqi / 380);
+  width: 100%;
+  padding: calc(var(--dv-bezel-w) * var(--dv-scale));
+  background: var(--dv-bezel);
+  border-radius: calc(var(--dv-radius) * var(--dv-scale));
+  box-shadow: var(--shadow-page);
+}
+
+.device-screen {
+  aspect-ratio: var(--dv-aspect);
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+  background: var(--dv-bg);
+  color: var(--dv-ink);
+  border-radius: calc(max(0px, (var(--dv-radius) - var(--dv-bezel-w)) * var(--dv-scale)));
+}
+
+.device-statusbar {
+  flex: none;
+  height: calc(30 * var(--dv-scale));
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 0 calc(18 * var(--dv-scale));
+  font-family: var(--font-ui);
+  font-size: calc(11 * var(--dv-scale));
+  font-weight: 600;
+  color: var(--dv-ink);
+}
+
+.device-clock {
+  letter-spacing: 0.01em;
+}
+
+.device-batt {
+  position: relative;
+  flex: none;
+  width: calc(22 * var(--dv-scale));
+  height: calc(11 * var(--dv-scale));
+  border: calc(1.4 * var(--dv-scale)) solid var(--dv-ink);
+  border-radius: calc(3 * var(--dv-scale));
+  opacity: 0.7;
+}
+
+.device-batt::before {
+  content: "";
+  position: absolute;
+  top: calc(1.5 * var(--dv-scale));
+  bottom: calc(1.5 * var(--dv-scale));
+  left: calc(1.5 * var(--dv-scale));
+  width: 55%;
+  background: var(--dv-ink);
+  border-radius: 1px;
+}
+
+.device-batt::after {
+  content: "";
+  position: absolute;
+  right: calc(-3 * var(--dv-scale));
+  top: 30%;
+  height: 40%;
+  width: calc(2 * var(--dv-scale));
+  border-radius: 1px;
+  background: var(--dv-ink);
+}
+
+.device-content {
+  flex: 1;
+  min-height: 0;
+  overflow-y: auto;
+  padding: calc(var(--dv-my) * var(--dv-scale)) calc(var(--dv-mx) * var(--dv-scale));
+  font-family: var(--font-book);
+  font-size: calc(var(--dv-fs) * var(--dv-scale));
+  line-height: var(--dv-lh);
+}
+
+.device-frame[data-kind="eink"] .device-content::-webkit-scrollbar {
+  display: none;
+}
+
+.device-opener {
+  text-align: center;
+  margin-bottom: calc(20 * var(--dv-scale));
+}
+
+.device-eyebrow {
+  font-family: var(--font-ui);
+  font-size: calc(10 * var(--dv-scale));
+  font-weight: 600;
+  letter-spacing: 0.22em;
+  text-transform: uppercase;
+  opacity: 0.5;
+  margin-bottom: calc(8 * var(--dv-scale));
+}
+
+.device-title {
+  font-family: var(--font-heading);
+  font-weight: 500;
+  font-size: calc(24 * var(--dv-scale));
+  line-height: 1.2;
+  letter-spacing: -0.01em;
+}
+
+.device-body p {
+  font-family: var(--font-book);
+  hyphens: auto;
+  margin: 0 0 0.8em;
+  color: var(--dv-ink);
+}
+
+.device-body p[data-indent="true"] {
+  text-indent: 1.2em;
+}
+
+.device-frame[data-kind="eink"] .device-body p {
+  text-align: justify;
+}
+
+.device-frame[data-kind="phone"] .device-body p,
+.device-frame[data-kind="tablet"] .device-body p {
+  text-align: left;
+}
+
+.device-body h1,
+.device-body h2,
+.device-body h3 {
+  font-family: var(--font-heading);
+  font-weight: 600;
+  line-height: 1.25;
+  margin: 1.2em 0 0.5em;
+}
+
+.device-body blockquote {
+  margin: 0 0 0.8em;
+  padding-left: 1em;
+  border-left: 2px solid currentColor;
+  font-style: italic;
+  opacity: 0.85;
+}
+
+.device-body hr {
+  border: none;
+  border-top: 1px solid currentColor;
+  width: calc(40 * var(--dv-scale));
+  margin: calc(16 * var(--dv-scale)) auto;
+  opacity: 0.3;
+}
+
+.device-body img {
+  display: block;
+  max-width: 100%;
+  height: auto;
+  margin: 0.8em auto;
+}
+
+.device-footer {
+  flex: none;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: calc(10 * var(--dv-scale));
+  padding: calc(8 * var(--dv-scale)) calc(var(--dv-mx) * var(--dv-scale));
+  font-family: var(--font-ui);
+  font-size: calc(11 * var(--dv-scale));
+  color: var(--dv-ink);
+  opacity: 0.55;
+}
+
+.device-foot-title {
+  overflow: hidden;
+  white-space: nowrap;
+  text-overflow: ellipsis;
+}
+
+.device-content .cover-art {
+  width: 100%;
+  margin: auto;
+  box-shadow: none;
+  border: none;
+  border-radius: 0;
+}
+
+/* Google Drive backup */
+.backup-btn[data-state="pending"] {
+  color: var(--accent);
+}
+
+.backup-btn[data-state="error"] {
+  color: var(--danger);
+}
+
+.backup-btn[data-state="working"] svg {
+  animation: backup-spin 0.9s linear infinite;
+}
+
+@keyframes backup-spin {
+  to {
+    transform: rotate(360deg);
+  }
+}
+
+.library-restore {
+  display: flex;
+  justify-content: center;
+  padding: 0 44px 60px;
+}
+
+.restore-link {
+  display: inline-flex;
+  align-items: center;
+  gap: 7px;
+  color: var(--ink-faint);
+  font-family: var(--font-ui);
+  font-size: var(--t-2);
+  transition: color 120ms var(--ease);
+}
+
+.restore-link:hover:not(:disabled) {
+  color: var(--accent);
+}
+
+.restore-link:disabled {
+  opacity: 0.6;
+  cursor: default;
+}
+
+.backup-intro,
+.backup-connecting {
+  display: flex;
+  flex-direction: column;
+  align-items: flex-start;
+  gap: 16px;
+}
+
+.backup-intro p,
+.backup-connecting p {
+  margin: 0;
+  color: var(--ink-soft);
+  font-family: var(--font-ui);
+  font-size: var(--t-3);
+  line-height: 1.55;
+}
+
+.backup-text-btn {
+  color: var(--ink-faint);
+  font-family: var(--font-ui);
+  font-size: var(--t-2);
+  transition: color 120ms var(--ease);
+}
+
+.backup-text-btn:hover {
+  color: var(--accent);
+}
+
+.backup-waiting {
+  display: flex;
+  align-items: center;
+  gap: 9px;
+  font-family: var(--font-ui);
+  font-size: var(--t-3);
+  color: var(--ink);
+}
+
+.backup-waiting svg {
+  color: var(--ink-soft);
+  animation: backup-spin 0.9s linear infinite;
+}
+
+.backup-links {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+}
+
+.backup-link-sep {
+  color: var(--line-strong);
+}
+
+.backup-link-row {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  width: 100%;
+  margin-top: 2px;
+}
+
+.backup-account {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 16px;
+  padding-bottom: 16px;
+  border-bottom: 1px solid var(--line);
+}
+
+.backup-account-info {
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+  min-width: 0;
+}
+
+.backup-email {
+  font-family: var(--font-ui);
+  font-size: var(--t-3);
+  color: var(--ink);
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.backup-status-row {
+  display: flex;
+  align-items: center;
+  gap: 9px;
+  margin: 18px 0;
+  font-family: var(--font-ui);
+  font-size: var(--t-3);
+  color: var(--ink-soft);
+}
+
+.backup-dot {
+  width: 8px;
+  height: 8px;
+  border-radius: 50%;
+  flex: none;
+}
+
+.backup-dot.is-synced {
+  background: var(--ink-faint);
+}
+
+.backup-dot.is-pending {
+  background: var(--accent);
+}
+
+.backup-actions {
+  display: flex;
+  gap: 10px;
+}
+
+.backup-note {
+  margin: 18px 0 0;
+  color: var(--ink-faint);
+  font-family: var(--font-ui);
+  font-size: var(--t-2);
+  line-height: 1.5;
+}

src/styles/fonts.css

@@ -29,3 +29,67 @@
   font-style: italic;
   font-display: block;
 }
+
+@font-face {
+  font-family: "EB Garamond";
+  src: url("/fonts/EBGaramond-VF.ttf") format("truetype-variations");
+  font-weight: 400 800;
+  font-style: normal;
+  font-display: block;
+}
+
+@font-face {
+  font-family: "EB Garamond";
+  src: url("/fonts/EBGaramond-Italic-VF.ttf") format("truetype-variations");
+  font-weight: 400 800;
+  font-style: italic;
+  font-display: block;
+}
+
+@font-face {
+  font-family: "Lora";
+  src: url("/fonts/Lora-VF.ttf") format("truetype-variations");
+  font-weight: 400 700;
+  font-style: normal;
+  font-display: block;
+}
+
+@font-face {
+  font-family: "Lora";
+  src: url("/fonts/Lora-Italic-VF.ttf") format("truetype-variations");
+  font-weight: 400 700;
+  font-style: italic;
+  font-display: block;
+}
+
+@font-face {
+  font-family: "Source Serif 4";
+  src: url("/fonts/SourceSerif4-VF.ttf") format("truetype-variations");
+  font-weight: 200 900;
+  font-style: normal;
+  font-display: block;
+}
+
+@font-face {
+  font-family: "Source Serif 4";
+  src: url("/fonts/SourceSerif4-Italic-VF.ttf") format("truetype-variations");
+  font-weight: 200 900;
+  font-style: italic;
+  font-display: block;
+}
+
+@font-face {
+  font-family: "Fraunces";
+  src: url("/fonts/Fraunces-VF.ttf") format("truetype-variations");
+  font-weight: 100 900;
+  font-style: normal;
+  font-display: block;
+}
+
+@font-face {
+  font-family: "Fraunces";
+  src: url("/fonts/Fraunces-Italic-VF.ttf") format("truetype-variations");
+  font-weight: 100 900;
+  font-style: italic;
+  font-display: block;
+}

src/styles/tokens.css

@@ -1,6 +1,7 @@
 :root {
   --font-ui: "Hanken Grotesk", ui-sans-serif, system-ui, -apple-system, sans-serif;
   --font-book: "Literata", Georgia, "Times New Roman", serif;
+  --font-heading: "Literata", Georgia, "Times New Roman", serif;
 
   --r-sm: 5px;
   --r-md: 8px;

vite.config.ts

@@ -26,7 +26,7 @@ export default defineConfig(async () => ({
       : undefined,
     watch: {
       // 3. tell Vite to ignore watching `src-tauri`
-      ignored: ["**/src-tauri/**"],
+      ignored: ["**/src-tauri/**", "**/website/**"],
     },
   },
 }));

website/.gitignore

@@ -0,0 +1,4 @@
+dist/
+node_modules/
+.astro/
+.DS_Store

website/README.md

@@ -0,0 +1,48 @@
+# margin website
+
+The marketing site for **Margin** — the offline book-writing and publishing app. Built with
+[Astro](https://astro.build), it's a single landing page that ships almost no JavaScript and
+reuses the app's *Quiet Press* design system (Literata + Hanken Grotesk, warm light/dark themes).
+
+## Develop
+
+```sh
+cd website
+pnpm install
+pnpm dev        # http://localhost:4321
+pnpm build      # static output to website/dist/
+pnpm preview    # preview the production build
+```
+
+## Where to change things
+
+Almost everything lives in **`src/data/site.ts`**:
+
+- `price` — the one-time price (`"$5"` / `"$10"` …). Shown everywhere automatically.
+- `repo` — the GitHub repo (`priyanshujain/margin`) that hosts release artifacts.
+- `buyUrl` — point this at a payment processor (Gumroad / Polar / Stripe / Lemon Squeezy)
+  when one is wired up; until then it falls back to the GitHub releases page.
+- `faqs`, `compare`, `publishTargets` — the page content.
+
+## Downloads
+
+Download buttons resolve the **latest GitHub release** asset per OS at runtime
+(`src/components/DownloadScript.astro`):
+
+- macOS → `.dmg`
+- Windows → `.msi`
+- Linux → `.AppImage` (falls back to `.deb` / `.rpm`)
+
+The OS is auto-detected for the primary button. If the GitHub API is unreachable or there's no
+published release yet, every button falls back to the releases page — so they always work.
+
+## Deploy
+
+`pnpm build` produces a fully static `dist/` that hosts anywhere — GitHub Pages, Cloudflare
+Pages, Netlify, Vercel. Set the real domain in `astro.config.mjs` (`site`) for correct
+canonical / Open Graph URLs.
+
+## Fonts
+
+`public/fonts/` carries the same OFL variable fonts the app bundles (Literata, Hanken Grotesk),
+so the site matches the product exactly.

website/astro.config.mjs

@@ -0,0 +1,7 @@
+import { defineConfig } from "astro/config";
+
+// The canonical URL is only used for absolute links (OG tags, sitemap).
+// Change it to the real domain when the site goes live.
+export default defineConfig({
+  site: "https://margin.73ai.org",
+});

website/logo.svg

@@ -0,0 +1,7 @@
+<svg width="350" height="350" viewBox="0 0 350 350" fill="none" xmlns="http://www.w3.org/2000/svg">
+<rect width="350" height="350" fill="white"/>
+<path d="M263.799 32.9229C266.952 32.1427 270 34.5286 270 37.7764V312.13C270 315.392 266.926 317.781 263.765 316.975L83.7646 271.075C81.5501 270.51 80.0002 268.516 80 266.23V82.3271C80 80.0284 81.5675 78.0259 83.7988 77.4736L263.799 32.9229Z" stroke="black" stroke-width="10"/>
+<rect x="231" y="69" width="10" height="212" rx="5" fill="black"/>
+<rect x="204" y="85" width="10" height="180" rx="5" fill="black"/>
+<rect x="104" y="135" width="10" height="80" rx="5" fill="black"/>
+</svg>

website/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "margin-website",
+  "private": true,
+  "version": "0.1.0",
+  "type": "module",
+  "scripts": {
+    "dev": "astro dev",
+    "build": "astro build",
+    "preview": "astro preview",
+    "deploy": "astro build && npx wrangler pages deploy dist --project-name=margin --commit-dirty=true"
+  },
+  "dependencies": {
+    "astro": "^5.6.1"
+  }
+}

website/public/fonts/HankenGrotesk-OFL.txt

@@ -0,0 +1,94 @@
+Copyright 2021 The Hanken Grotesk Project Authors (https://github.com/marcologous/hanken-grotesk)
+
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+http://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

website/public/fonts/Literata-OFL.txt

@@ -0,0 +1,93 @@
+Copyright 2017 The Literata Project Authors (https://github.com/googlefonts/literata)
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+http://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

website/public/logo-dark.svg

@@ -0,0 +1,6 @@
+<svg width="350" height="350" viewBox="0 0 350 350" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M263.799 32.9229C266.952 32.1427 270 34.5286 270 37.7764V312.13C270 315.392 266.926 317.781 263.765 316.975L83.7646 271.075C81.5501 270.51 80.0002 268.516 80 266.23V82.3271C80 80.0284 81.5675 78.0259 83.7988 77.4736L263.799 32.9229Z" stroke="#ece6da" stroke-width="10"/>
+<rect x="231" y="69" width="10" height="212" rx="5" fill="#ece6da"/>
+<rect x="204" y="85" width="10" height="180" rx="5" fill="#ece6da"/>
+<rect x="104" y="135" width="10" height="80" rx="5" fill="#ece6da"/>
+</svg>

website/public/logo-light.svg

@@ -0,0 +1,6 @@
+<svg width="350" height="350" viewBox="0 0 350 350" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M263.799 32.9229C266.952 32.1427 270 34.5286 270 37.7764V312.13C270 315.392 266.926 317.781 263.765 316.975L83.7646 271.075C81.5501 270.51 80.0002 268.516 80 266.23V82.3271C80 80.0284 81.5675 78.0259 83.7988 77.4736L263.799 32.9229Z" stroke="#23201b" stroke-width="10"/>
+<rect x="231" y="69" width="10" height="212" rx="5" fill="#23201b"/>
+<rect x="204" y="85" width="10" height="180" rx="5" fill="#23201b"/>
+<rect x="104" y="135" width="10" height="80" rx="5" fill="#23201b"/>
+</svg>

website/public/logos/amazon.svg

@@ -0,0 +1 @@
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+		</filter>
+		<filter id="blur_belly_glare" x="-0.8" width="2.6" y="-0.5" height="2">
+			<feGaussianBlur stdDeviation="1.78 2.19"/>
+		</filter>
+		<filter id="blur_head_glare" x="-0.3" width="1.6" y="-0.3" height="1.6">
+			<feGaussianBlur stdDeviation="1.73"/>
+		</filter>
+		<filter id="blur_neck_glare" x="-0.2" width="1.4" y="-0.2" height="1.4">
+			<feGaussianBlur stdDeviation="0.78"/>
+		</filter>
+		<filter id="blur_wing_left_glare" x="-0.2" width="1.4" y="-0.2" height="1.4">
+			<feGaussianBlur stdDeviation="0.98"/>
+		</filter>
+		<filter id="blur_wing_right_glare" x="-0.2" width="1.4" y="-0.2" height="1.4">
+			<feGaussianBlur stdDeviation="1.19 1.17"/>
+		</filter>
+		<filter id="blur_foot_left_layer_1" x="-0.2" width="1.4" y="-0.2" height="1.4">
+			<feGaussianBlur stdDeviation="3.38"/>
+		</filter>
+		<filter id="blur_foot_left_layer_2">
+			<feGaussianBlur stdDeviation="2.1 2.06"/>
+		</filter>
+		<filter id="blur_foot_left_glare">
+			<feGaussianBlur stdDeviation="0.32"/>
+		</filter>
+		<filter id="blur_foot_right_shadow">
+			<feGaussianBlur stdDeviation="1.95 1.9"/>
+		</filter>
+		<filter id="blur_foot_right_layer_1" x="-0.2" width="1.4" y="-0.2" height="1.4">
+			<feGaussianBlur stdDeviation="4.12"/>
+		</filter>
+		<filter id="blur_foot_right_layer_2" x="-0.2" width="1.4" y="-0.2" height="1.4">
+			<feGaussianBlur stdDeviation="3.12 3.37"/>
+		</filter>
+		<filter id="blur_foot_right_glare" x="-0.2" width="1.4" y="-0.2" height="1.4">
+			<feGaussianBlur stdDeviation="0.41"/>
+		</filter>
+		<filter id="blur_wing_tip_right_shadow_lower" x="-0.3" width="1.6" y="-0.3" height="1.6">
+			<feGaussianBlur stdDeviation="2.45"/>
+		</filter>
+		<filter id="blur_wing_tip_right_shadow_upper" x="-0.2" width="1.4" y="-0.2" height="1.4">
+			<feGaussianBlur stdDeviation="1.12 0.81"/>
+		</filter>
+		<filter id="blur_wing_tip_right_glare" x="-0.2" width="1.4" y="-0.2" height="1.4">
+			<feGaussianBlur stdDeviation="0.88"/>
+		</filter>
+		<filter id="blur_pupil_left_glare" x="-0.3" width="1.6" y="-0.3" height="1.6">
+			<feGaussianBlur stdDeviation="0.44"/>
+		</filter>
+		<filter id="blur_eyebrow_left">
+			<feGaussianBlur stdDeviation="0.12"/>
+		</filter>
+		<filter id="blur_pupil_right_glare" x="-0.2" width="1.4" y="-0.2" height="1.4">
+			<feGaussianBlur stdDeviation="0.45"/>
+		</filter>
+		<filter id="blur_eyebrow_right">
+			<feGaussianBlur stdDeviation="0.13"/>
+		</filter>
+		<filter id="blur_beak_shadow_lower" x="-0.2" width="1.4" y="-0.2" height="1.4">
+			<feGaussianBlur stdDeviation="1.75"/>
+		</filter>
+		<filter id="blur_beak_shadow_upper">
+			<feGaussianBlur stdDeviation="0.8 0.74"/>
+		</filter>
+		<filter id="blur_mandible_lower_glare" x="-0.2" width="1.4" y="-0.2" height="1.4">
+			<feGaussianBlur stdDeviation="0.77"/>
+		</filter>
+		<filter id="blur_mandible_upper_shadow">
+			<feGaussianBlur stdDeviation="0.65"/>
+		</filter>
+		<filter id="blur_mandible_upper_glare" x="-0.2" width="1.4" y="-0.2" height="1.4">
+			<feGaussianBlur stdDeviation="0.73"/>
+		</filter>
+		<filter id="blur_naris_left" x="-0.2" width="1.4" y="-0.2" height="1.4">
+			<feGaussianBlur stdDeviation="0.1"/>
+		</filter>
+		<filter id="blur_naris_right">
+			<feGaussianBlur stdDeviation="0.1"/>
+		</filter>
+		<filter id="blur_beak_corner" x="-0.2" width="1.4" y="-0.2" height="1.4">
+			<feGaussianBlur stdDeviation="0.23"/>
+		</filter>
+		<clipPath id="clip_body">
+			<use href="#body_base" xlink:href="#body_base"/>
+		</clipPath>
+		<clipPath id="clip_wing_left">
+			<use href="#wing_left_base" xlink:href="#wing_left_base"/>
+		</clipPath>
+		<clipPath id="clip_wing_right">
+			<use href="#wing_right_base" xlink:href="#wing_right_base"/>
+		</clipPath>
+		<clipPath id="clip_foot_left">
+			<use href="#foot_left_base" xlink:href="#foot_left_base"/>
+		</clipPath>
+		<clipPath id="clip_foot_right">
+			<use href="#foot_right_base" xlink:href="#foot_right_base"/>
+		</clipPath>
+		<clipPath id="clip_wing_tip_right">
+			<use href="#wing_tip_right_base" xlink:href="#wing_tip_right_base"/>
+		</clipPath>
+		<clipPath id="clip_eye_left">
+			<use href="#eyeball_left" xlink:href="#eyeball_left"/>
+		</clipPath>
+		<clipPath id="clip_pupil_left">
+			<use href="#pupil_left_base" xlink:href="#pupil_left_base"/>
+		</clipPath>
+		<clipPath id="clip_eye_right">
+			<use href="#eyeball_right" xlink:href="#eyeball_right"/>
+		</clipPath>
+		<clipPath id="clip_pupil_right">
+			<use href="#pupil_right_base" xlink:href="#pupil_right_base"/>
+		</clipPath>
+		<clipPath id="clip_mandible_lower">
+			<use href="#mandible_lower_base" xlink:href="#mandible_lower_base"/>
+		</clipPath>
+		<clipPath id="clip_mandible_upper">
+			<use href="#mandible_upper_base" xlink:href="#mandible_upper_base"/>
+		</clipPath>
+		<clipPath id="clip_beak">
+			<use href="#mandible_lower_base" xlink:href="#mandible_lower_base"/>
+			<use href="#mandible_upper_base" xlink:href="#mandible_upper_base"/>
+		</clipPath>
+	</defs>
+	<g id="tux">
+		<g id="body">
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+			<path id="belly" fill="#fdfdfb"
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+			<g id="body_self_shadows">
+				<path id="belly_shadow_left" opacity="0.25" fill="url(#fill_belly_shadow_left)" filter="url(#blur_belly_shadow_left)" clip-path="url(#clip_body)"
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+				<path id="belly_shadow_right" opacity="0.42" fill="url(#fill_belly_shadow_right)" filter="url(#blur_belly_shadow_right)" clip-path="url(#clip_body)"
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+				<path id="belly_shadow_middle" opacity="0.2" fill="url(#fill_belly_shadow_middle)" filter="url(#blur_belly_shadow_middle)" clip-path="url(#clip_body)"
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+				<path id="belly_shadow_lower" opacity="0.11" fill="#000000" filter="url(#blur_belly_shadow_lower)" clip-path="url(#clip_body)"
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+			</g>
+			<g id="body_glare">
+				<path id="belly_glare" opacity="0.75" fill="#7c7c7c" filter="url(#blur_belly_glare)" clip-path="url(#clip_body)"
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+				<path id="head_glare" fill="#7c7c7c" filter="url(#blur_head_glare)" clip-path="url(#clip_body)"
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+				<path id="neck_glare" fill="#838384" filter="url(#blur_neck_glare)" clip-path="url(#clip_body)"
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+			</g>
+		</g>
+		<g id="wings">
+			<g id="wing_left">
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+		<g id="feet">
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+				</g>
+				<path id="beak_corner" fill="url(#fill_beak_corner)" filter="url(#blur_beak_corner)" clip-path="url(#clip_beak)"
+					d="m 129.27,69.15 a 2.42,3.1 16.94 0 1 -2.81,3.04 2.42,3.1 16.94 0 1 -2.12,-3.04 2.42,3.1 16.94 0 1 2.81,-3.05 2.42,3.1 16.94 0 1 2.12,3.05 z"/>
+			</g>
+		</g>
+	</g>
+</svg>

website/public/logos/macos.svg

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+<svg xmlns="http://www.w3.org/2000/svg" xml:space="preserve" width="814" height="1000">
+  <path d="M788.1 340.9c-5.8 4.5-108.2 62.2-108.2 190.5 0 148.4 130.3 200.9 134.2 202.2-.6 3.2-20.7 71.9-68.7 141.9-42.8 61.6-87.5 123.1-155.5 123.1s-85.5-39.5-164-39.5c-76.5 0-103.7 40.8-165.9 40.8s-105.6-57-155.5-127C46.7 790.7 0 663 0 541.8c0-194.4 126.4-297.5 250.8-297.5 66.1 0 121.2 43.4 162.7 43.4 39.5 0 101.1-46 176.3-46 28.5 0 130.9 2.6 198.3 99.2zm-234-181.5c31.1-36.9 53.1-88.1 53.1-139.3 0-7.1-.6-14.3-1.9-20.1-50.6 1.9-110.8 33.7-147.1 75.8-28.5 32.4-55.1 83.6-55.1 135.5 0 7.8 1.3 15.6 1.9 18.1 3.2.6 8.4 1.3 13.6 1.3 45.4 0 102.5-30.4 135.5-71.3z"/>
+</svg>

website/public/logos/overdrive.svg

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website/public/logos/scribd.svg

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website/public/logos/tolino.svg

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website/public/logos/windows.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 4875 4875"><path fill="#0078d4" d="M0 0h2311v2310H0zm2564 0h2311v2310H2564zM0 2564h2311v2311H0zm2564 0h2311v2311H2564"/></svg>

website/src/components/AppWindow.astro

@@ -0,0 +1,477 @@
+---
+// A faithful CSS mock-up of the Margin desktop app: the All-books sidebar with
+// front-matter / chapter sections, the writing surface set in Literata with live
+// proofing, and the live PDF preview dock with its trim selector.
+---
+
+<div class="win" role="img" aria-label="The Margin app: a chapter sidebar, a writing surface with live proofing, and a live PDF page preview.">
+  <div class="win__bar">
+    <span class="win__chrome"><span class="dot"></span><span class="dot"></span><span class="dot"></span></span>
+    <span class="win__title">The Lighthouse Keeper</span>
+    <span class="win__actions">
+      <span class="ibtn"><svg class="i" viewBox="0 0 24 24"><path d="M11 4a7 7 0 1 0 0 14 7 7 0 0 0 0-14zM20 20l-4-4" /></svg></span>
+      <span class="ibtn"><svg class="i" viewBox="0 0 24 24"><path d="M4 17l4-10 4 10M5.4 13.4h5.2M15 17l2.5 2.5L22 14" /></svg></span>
+      <span class="ibtn"><svg class="i" viewBox="0 0 24 24"><path d="M4 7h16M4 12h12M4 17h7M13.5 18.5c1-1.2 2-1.2 3 0s2 1.2 3 0" /></svg></span>
+      <span class="ibtn"><svg class="i" viewBox="0 0 24 24"><path d="M3 5v14M21 5v14M7 12h10M7 12l3-3M7 12l3 3M17 12l-3-3M17 12l-3 3" /></svg></span>
+      <span class="ibtn"><svg class="i" viewBox="0 0 24 24"><path d="M5 13v6h14v-6M12 16V3M8 7l4-4 4 4" /></svg></span>
+      <span class="ibtn"><svg class="i" viewBox="0 0 24 24"><path d="M21 12.8A9 9 0 1 1 11.2 3a7 7 0 0 0 9.8 9.8z" /></svg></span>
+      <span class="ibtn is-on"><svg class="i" viewBox="0 0 24 24"><path d="M3 4.5h18v15H3zM14 4.5v15" /></svg></span>
+    </span>
+  </div>
+
+  <div class="win__body">
+    <aside class="side">
+      <span class="side__brand">
+        <svg class="i" viewBox="0 0 24 24"><path d="M14 7l-5 5 5 5" /></svg>All books
+      </span>
+      <span class="side__cover">
+        <svg class="i" viewBox="0 0 24 24"><path d="M5 4h11l3 3v13H5zM16 4v4h3" /></svg>Cover
+      </span>
+      <span class="side__add">
+        <svg class="i" viewBox="0 0 24 24"><path d="M12 5v14M5 12h14" /></svg>Add page
+      </span>
+
+      <div class="side__scroll">
+        <div class="side__section">
+          <p class="side__label">Front matter</p>
+          <ul class="side__list">
+            <li class="row"><span class="grip"></span><span class="num"></span><span class="text"><span class="title">Title Page</span></span></li>
+            <li class="row"><span class="grip"></span><span class="num"></span><span class="text"><span class="title">Dedication</span></span></li>
+          </ul>
+        </div>
+
+        <div class="side__section">
+          <p class="side__label">Chapters</p>
+          <ul class="side__list">
+            <li class="row is-active">
+              <span class="grip"><svg class="i" viewBox="0 0 24 24"><path d="M9 6h.01M15 6h.01M9 12h.01M15 12h.01M9 18h.01M15 18h.01" /></svg></span>
+              <span class="num">1</span>
+              <span class="text">
+                <span class="title">The Cliff</span>
+                <span class="meta">Edited yesterday</span>
+              </span>
+            </li>
+            <li class="row"><span class="grip"></span><span class="num">2</span><span class="text"><span class="title">A Light at Sea</span></span></li>
+            <li class="row"><span class="grip"></span><span class="num">3</span><span class="text"><span class="title">Salt and Silence</span></span></li>
+            <li class="row"><span class="grip"></span><span class="num">4</span><span class="text"><span class="title">The Long Night</span></span></li>
+          </ul>
+          <span class="side__newchapter">
+            <svg class="i" viewBox="0 0 24 24"><path d="M12 5v14M5 12h14" /></svg>New chapter
+          </span>
+        </div>
+      </div>
+    </aside>
+
+    <main class="page">
+      <div class="page__sheet">
+        <p class="chapno">Chapter 1</p>
+        <h4 class="chaptitle">The Cliff</h4>
+        <p>
+          The lighthouse had stood on the headland for ninety years, and in all that time it had
+          never once gone dark. Mara intended to keep it that way.
+        </p>
+        <p>
+          She climbed the iron stair each evening at dusk, counting the
+          <span class="u-spell">hundered</span> and one steps out of habit, and watched the lamp
+          <span class="u-grammar">turns</span> its slow circle across the water.
+        </p>
+        <p>The sea, tonight, was the colour of pewter.</p>
+      </div>
+    </main>
+
+    <aside class="dock">
+      <div class="dock__head">
+        <span class="dock__label">Preview</span>
+        <span class="dock__trim">
+          5 × 8 in
+          <svg class="i" viewBox="0 0 24 24"><path d="M8 10l4-4 4 4M8 14l4 4 4-4" /></svg>
+        </span>
+      </div>
+
+      <div class="dock__pages">
+        <div class="dock__page">
+          <p class="pch">Chapter 1</p>
+          <p class="pdt">The Cliff</p>
+          <p class="pp pp--first">
+            The lighthouse had stood on the headland for ninety years, and in all that time it had
+            never once gone dark. Mara intended to keep it that way.
+          </p>
+          <p class="pp">
+            She climbed the iron stair each evening at dusk, counting the hundred and one steps out
+            of habit, and watched the lamp turn its slow circle across the water.
+          </p>
+          <p class="pp">The sea, tonight, was the colour of pewter.</p>
+          <span class="pg">1</span>
+        </div>
+        <div class="dock__page dock__page--peek">
+          <p class="pp pp--first">
+            Morning came grey and slow. She brewed coffee in the keeper's kitchen and listened to the
+            gulls argue over the rocks below.
+          </p>
+          <p class="pp">The radio crackled once, then fell silent.</p>
+        </div>
+      </div>
+    </aside>
+  </div>
+</div>
+
+<style>
+  .win {
+    width: 100%;
+    border-radius: var(--r-xl);
+    background: var(--shell);
+    border: 1px solid var(--line-strong);
+    box-shadow: var(--shadow-deep);
+    overflow: hidden;
+  }
+  .i {
+    width: 15px;
+    height: 15px;
+    flex: none;
+    fill: none;
+    stroke: currentColor;
+    stroke-width: 1.6;
+    stroke-linecap: round;
+    stroke-linejoin: round;
+  }
+
+  .win__bar {
+    display: grid;
+    grid-template-columns: 1fr auto 1fr;
+    align-items: center;
+    height: 44px;
+    padding-inline: 14px;
+    border-bottom: 1px solid var(--line);
+    background: var(--shell);
+  }
+  .win__chrome {
+    display: flex;
+    gap: 8px;
+  }
+  .dot {
+    width: 11px;
+    height: 11px;
+    border-radius: 50%;
+  }
+  .win__chrome .dot:nth-child(1) {
+    background: #ff5f57;
+  }
+  .win__chrome .dot:nth-child(2) {
+    background: #febc2e;
+  }
+  .win__chrome .dot:nth-child(3) {
+    background: #28c840;
+  }
+  .win__title {
+    grid-column: 2;
+    font-size: 0.82rem;
+    letter-spacing: 0.01em;
+    color: var(--ink-soft);
+  }
+  .win__actions {
+    grid-column: 3;
+    justify-self: end;
+    display: flex;
+    gap: 2px;
+  }
+  .ibtn {
+    width: 28px;
+    height: 28px;
+    display: grid;
+    place-items: center;
+    border-radius: var(--r-sm);
+    color: var(--ink-soft);
+  }
+  .ibtn.is-on {
+    color: var(--accent);
+    background: var(--accent-wash);
+    box-shadow: inset 0 0 0 1px var(--line-strong);
+  }
+
+  .win__body {
+    display: grid;
+    grid-template-columns: 196px 1fr 200px;
+    min-height: 432px;
+  }
+
+  .side {
+    display: flex;
+    flex-direction: column;
+    background: var(--sidebar);
+    border-right: 1px solid var(--line);
+    padding: 12px 10px;
+    font-size: 0.8rem;
+  }
+  .side__brand,
+  .side__cover,
+  .side__add,
+  .side__newchapter {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    padding: 6px 8px;
+    border-radius: var(--r-sm);
+    color: var(--ink-soft);
+  }
+  .side__brand {
+    color: var(--ink-faint);
+    font-size: 0.74rem;
+  }
+  .side__cover {
+    color: var(--ink);
+    margin-top: 2px;
+  }
+  .side__add {
+    color: var(--ink-faint);
+    margin-bottom: 8px;
+  }
+  .side__scroll {
+    flex: 1;
+  }
+  .side__section + .side__section {
+    margin-top: 16px;
+  }
+  .side__label {
+    font-size: 0.62rem;
+    letter-spacing: 0.12em;
+    text-transform: uppercase;
+    color: var(--ink-faint);
+    font-weight: 650;
+    margin: 0 0 6px;
+    padding-inline: 8px;
+  }
+  .side__list {
+    list-style: none;
+    margin: 0;
+    padding: 0;
+    display: flex;
+    flex-direction: column;
+    gap: 1px;
+  }
+  .row {
+    display: grid;
+    grid-template-columns: 14px 16px 1fr;
+    align-items: center;
+    gap: 4px;
+    padding: 5px 8px;
+    border-radius: var(--r-sm);
+    color: var(--ink-soft);
+  }
+  .row .grip {
+    color: var(--ink-faint);
+    opacity: 0;
+    display: grid;
+    place-items: center;
+  }
+  .row .grip .i {
+    width: 13px;
+    height: 13px;
+  }
+  .row .num {
+    font-size: 0.72rem;
+    color: var(--ink-faint);
+    text-align: center;
+  }
+  .row .text {
+    display: flex;
+    flex-direction: column;
+    min-width: 0;
+  }
+  .row .title {
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+  }
+  .row .meta {
+    font-size: 0.66rem;
+    color: var(--ink-faint);
+    margin-top: 1px;
+  }
+  .row.is-active {
+    background: var(--raised);
+    color: var(--ink);
+    box-shadow: 0 1px 2px rgba(35, 32, 27, 0.08), inset 0 0 0 1px var(--line);
+  }
+  .row.is-active .grip {
+    opacity: 1;
+  }
+  .row.is-active .num {
+    color: var(--ink-soft);
+  }
+  .side__newchapter {
+    color: var(--ink-faint);
+    font-size: 0.76rem;
+    margin-top: 4px;
+  }
+
+  .page {
+    display: flex;
+    justify-content: center;
+    padding: 30px 18px;
+    overflow: hidden;
+  }
+  .page__sheet {
+    width: 100%;
+    max-width: 372px;
+    font-family: var(--font-book);
+    font-size: 0.92rem;
+    line-height: 1.6;
+    color: var(--ink);
+  }
+  .page__sheet p {
+    margin: 0;
+    text-indent: 1.3em;
+    text-align: justify;
+    hyphens: auto;
+    -webkit-hyphens: auto;
+  }
+  .page__sheet p + p {
+    margin-top: 0.2em;
+  }
+  .chapno {
+    text-indent: 0 !important;
+    text-align: center !important;
+    font-family: var(--font-ui);
+    font-size: 0.6rem;
+    font-weight: 600;
+    letter-spacing: 0.24em;
+    text-transform: uppercase;
+    color: var(--ink-faint);
+    margin: 0 0 0.5em !important;
+  }
+  .chaptitle {
+    text-indent: 0;
+    text-align: center;
+    font-size: 1.5rem;
+    font-weight: 540;
+    letter-spacing: -0.01em;
+    margin: 0 0 1.4em;
+  }
+  .chaptitle + p {
+    text-indent: 0;
+  }
+  .u-spell {
+    text-decoration: wavy underline var(--danger);
+    text-decoration-thickness: 1.5px;
+    text-underline-offset: 3px;
+  }
+  .u-grammar {
+    text-decoration: wavy underline var(--good);
+    text-decoration-thickness: 1.5px;
+    text-underline-offset: 3px;
+  }
+
+  .dock {
+    background: var(--shell);
+    border-left: 1px solid var(--line);
+    padding: 14px 14px 0;
+    overflow: hidden;
+  }
+  .dock__head {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    margin-bottom: 12px;
+  }
+  .dock__label {
+    font-size: 0.62rem;
+    letter-spacing: 0.12em;
+    text-transform: uppercase;
+    color: var(--ink-faint);
+    font-weight: 650;
+  }
+  .dock__trim {
+    display: inline-flex;
+    align-items: center;
+    gap: 4px;
+    font-family: var(--font-ui);
+    font-size: 0.66rem;
+    color: var(--ink-soft);
+    padding: 3px 5px 3px 8px;
+    border: 1px solid var(--line-strong);
+    border-radius: var(--r-sm);
+    background: var(--raised);
+  }
+  .dock__trim .i {
+    width: 12px;
+    height: 12px;
+    color: var(--ink-faint);
+  }
+  .dock__pages {
+    display: flex;
+    flex-direction: column;
+    gap: 14px;
+  }
+  .dock__page {
+    position: relative;
+    aspect-ratio: 5 / 8;
+    background: #fcfbf7;
+    border-radius: 3px;
+    box-shadow: var(--shadow-page);
+    padding: 18px 16px 22px;
+    overflow: hidden;
+    color: #2a2622;
+    flex: none;
+  }
+  .dock__page .pch {
+    font-family: var(--font-ui);
+    font-size: 4px;
+    letter-spacing: 0.22em;
+    text-transform: uppercase;
+    color: #9b9484;
+    text-align: center;
+    margin: 6px 0 4px;
+  }
+  .dock__page .pdt {
+    font-family: var(--font-book);
+    font-size: 9px;
+    font-weight: 560;
+    color: #23201b;
+    text-align: center;
+    margin: 0 0 11px;
+  }
+  .dock__page .pp {
+    font-family: var(--font-book);
+    font-size: 5.6px;
+    line-height: 1.62;
+    text-align: justify;
+    hyphens: auto;
+    -webkit-hyphens: auto;
+    text-indent: 1.3em;
+    margin: 0 0 0.5em;
+    color: #2a2622;
+  }
+  .dock__page .pp--first {
+    text-indent: 0;
+  }
+  .dock__page .pg {
+    position: absolute;
+    bottom: 9px;
+    left: 0;
+    right: 0;
+    text-align: center;
+    font-family: var(--font-book);
+    font-size: 5px;
+    color: #b3ab9c;
+  }
+  .dock__page--peek {
+    padding-top: 18px;
+  }
+
+  @media (max-width: 720px) {
+    .win__body {
+      grid-template-columns: 1fr 180px;
+    }
+    .side {
+      display: none;
+    }
+  }
+  @media (max-width: 480px) {
+    .win__body {
+      grid-template-columns: 1fr;
+    }
+    .dock {
+      display: none;
+    }
+  }
+</style>

website/src/components/BrandIcon.astro

@@ -0,0 +1,31 @@
+---
+const icons = import.meta.glob("../icons/*.svg", {
+  query: "?raw",
+  import: "default",
+  eager: true,
+});
+
+interface Props {
+  name: string;
+  label?: string;
+  class?: string;
+}
+const { name, label, class: cls } = Astro.props;
+const svg = (icons[`../icons/${name}.svg`] as string | undefined) ?? "";
+---
+
+<span class:list={["brand-icon", cls]} role="img" aria-label={label} set:html={svg}></span>
+
+<style is:global>
+  .brand-icon {
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    line-height: 0;
+  }
+  .brand-icon svg {
+    width: 100%;
+    height: 100%;
+    fill: currentColor;
+  }
+</style>

website/src/components/ClosingCta.astro

@@ -0,0 +1,46 @@
+---
+import DownloadButtons from "./DownloadButtons.astro";
+import OfferBadge from "./OfferBadge.astro";
+---
+
+<section class="section cta">
+  <div class="container cta__inner">
+    <h2>Start your book today.</h2>
+    <p class="lede">
+      Download Margin, open a blank page, and write the first line. When it's done, export it and
+      publish. All of it on your own machine, all of it yours.
+    </p>
+    <div class="cta__btns">
+      <DownloadButtons large />
+    </div>
+    <div class="cta__offer">
+      <OfferBadge />
+    </div>
+  </div>
+</section>
+
+<style>
+  .cta {
+    background:
+      radial-gradient(120% 120% at 50% 120%, var(--paper) 0%, transparent 62%),
+      var(--shell);
+  }
+  .cta__inner {
+    max-width: 640px;
+    margin-inline: auto;
+    text-align: center;
+  }
+  .cta .lede {
+    margin: 18px auto 0;
+  }
+  .cta__btns {
+    display: flex;
+    justify-content: center;
+    margin-top: 32px;
+  }
+  .cta__offer {
+    display: flex;
+    justify-content: center;
+    margin-top: 20px;
+  }
+</style>

website/src/components/Compare.astro

@@ -0,0 +1,169 @@
+---
+import { compare, site } from "../data/site";
+
+const keyFor: Record<string, "margin" | "vellum" | "atticus" | "lacuna"> = {
+  Margin: "margin",
+  Vellum: "vellum",
+  Atticus: "atticus",
+  Lacuna: "lacuna",
+};
+
+function cell(value: boolean | "partial") {
+  if (value === true) return { cls: "yes", label: "Yes" };
+  if (value === "partial") return { cls: "partial", label: "Varies" };
+  return { cls: "no", label: "No" };
+}
+---
+
+<section class="section compare" id="compare">
+  <div class="container">
+    <header class="block-head block-head--center">
+      <p class="eyebrow">How Margin compares</p>
+      <h2>A better way to make a book.</h2>
+      <p class="lede">
+        Atticus, Vellum, and Lacuna are capable tools. Here's where Margin is simply different:
+        offline, on every platform, and yours from $0.
+      </p>
+    </header>
+
+    <div class="table-wrap card">
+      <table>
+        <thead>
+          <tr>
+            <th class="th-feature"></th>
+            {
+              compare.cols.map((c) => (
+                <th class:list={["th-col", { "th-col--us": c === "Margin" }]}>{c}</th>
+              ))
+            }
+          </tr>
+        </thead>
+        <tbody>
+          {
+            compare.rows.map((row) => (
+              <tr>
+                <td class="td-feature">{row.feature}</td>
+                {
+                  compare.cols.map((c) => {
+                    const v = row[keyFor[c]];
+                    const m = cell(v);
+                    const isUs = c === "Margin";
+                    return (
+                      <td class:list={["td-val", { "td-val--us": isUs }]}>
+                        <span class:list={["mark", m.cls]} title={m.label}>
+                          {m.cls === "yes" ? (
+                            <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="3" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M20 6 9 17l-5-5" /></svg>
+                          ) : (
+                            <span class="bar" aria-hidden="true"></span>
+                          )}
+                          <span class="sr">{m.label}</span>
+                        </span>
+                      </td>
+                    );
+                  })
+                }
+              </tr>
+            ))
+          }
+        </tbody>
+      </table>
+    </div>
+    <p class="compare__foot">
+      Vellum is Mac-only. Lacuna runs on Mac and Windows. Atticus is cloud-based and asks you to
+      sign in. {site.name} runs offline on all three platforms, with no account at all.
+    </p>
+  </div>
+</section>
+
+<style>
+  .block-head--center {
+    margin-inline: auto;
+    text-align: center;
+  }
+  .block-head--center .lede {
+    margin-inline: auto;
+  }
+  .table-wrap {
+    overflow-x: auto;
+    padding: 6px;
+  }
+  table {
+    width: 100%;
+    border-collapse: collapse;
+    min-width: 640px;
+  }
+  th,
+  td {
+    padding: 15px 18px;
+    text-align: center;
+  }
+  .th-feature,
+  .td-feature {
+    text-align: left;
+    width: 42%;
+  }
+  thead th {
+    font-family: var(--font-ui);
+    font-size: 0.95rem;
+    font-weight: 680;
+    color: var(--ink-soft);
+    border-bottom: 1px solid var(--line);
+    padding-top: 18px;
+    padding-bottom: 18px;
+  }
+  .th-col--us {
+    color: var(--ink);
+    background: var(--accent-wash);
+    border-radius: var(--r-md) var(--r-md) 0 0;
+  }
+  .td-feature {
+    font-weight: 550;
+    color: var(--ink);
+    font-size: 0.95rem;
+  }
+  tbody tr + tr td {
+    border-top: 1px solid var(--line);
+  }
+  .td-val--us {
+    background: var(--accent-wash);
+  }
+  tbody tr:last-child .td-val--us {
+    border-radius: 0 0 var(--r-md) var(--r-md);
+  }
+  .mark {
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    width: 26px;
+    height: 26px;
+    border-radius: 50%;
+  }
+  .mark.yes {
+    background: color-mix(in srgb, var(--good) 16%, transparent);
+    color: var(--good);
+  }
+  .mark.yes svg {
+    width: 15px;
+    height: 15px;
+  }
+  .bar {
+    width: 12px;
+    height: 2px;
+    border-radius: 2px;
+    background: var(--line-strong);
+  }
+  .sr {
+    position: absolute;
+    width: 1px;
+    height: 1px;
+    overflow: hidden;
+    clip: rect(0 0 0 0);
+    white-space: nowrap;
+  }
+  .compare__foot {
+    margin-top: 18px;
+    font-size: 0.82rem;
+    color: var(--ink-faint);
+    max-width: 70ch;
+  }
+</style>

website/src/components/DownloadButtons.astro

@@ -0,0 +1,82 @@
+---
+import { site, platforms } from "../data/site";
+import { getRelease } from "../data/release";
+
+interface Props {
+  large?: boolean;
+}
+const { large = false } = Astro.props;
+const release = await getRelease();
+---
+
+<div class="dl">
+  <a
+    class:list={["btn", { "btn--lg": large }]}
+    href={site.releasesUrl}
+    data-download
+    rel="noopener"
+    download
+  >
+    <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" aria-hidden="true">
+      <path d="M12 3v12m0 0 4-4m-4 4-4-4M5 21h14" stroke-linecap="round" stroke-linejoin="round"></path>
+    </svg>
+    <span data-dl-label>Download {site.name}</span>
+  </a>
+
+  <div class="dl__os">
+    {
+      platforms.map((p) => (
+        <a
+          class="dl__chip"
+          href={release.urls[p.id]}
+          data-download-os={p.id}
+          rel="noopener"
+          download
+          aria-label={`Download for ${p.label}`}
+          title={`Download for ${p.label}`}
+        >
+          <img class="dl__logo" src={`/logos/${p.logo}`} alt={p.label} />
+        </a>
+      ))
+    }
+  </div>
+</div>
+
+<style>
+  .dl {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    gap: 16px;
+  }
+  .dl__os {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    gap: 12px;
+  }
+  .dl__chip {
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    flex: none;
+    width: 44px;
+    height: 44px;
+    background: #ffffff;
+    border: 1px solid var(--line-strong);
+    border-radius: var(--r-md);
+    box-shadow: var(--shadow-page);
+    transition:
+      box-shadow 0.18s var(--ease),
+      transform 0.18s var(--ease);
+  }
+  .dl__chip:hover {
+    transform: translateY(-1px);
+    box-shadow: var(--shadow-pop);
+  }
+  .dl__logo {
+    width: 22px;
+    height: 22px;
+    object-fit: contain;
+  }
+</style>

website/src/components/DownloadScript.astro

@@ -0,0 +1,64 @@
+---
+import { site, platforms } from "../data/site";
+import { getRelease } from "../data/release";
+
+const { repo, releasesUrl } = site;
+const { urls, version } = await getRelease();
+const matches = Object.fromEntries(platforms.map((p) => [p.id, p.match]));
+---
+
+<script define:vars={{ repo, releasesUrl, urls, version, matches }}>
+  const LABELS = { mac: "macOS", windows: "Windows", linux: "Linux" };
+
+  function detectOS() {
+    const ua = navigator.userAgent;
+    const plat = ((navigator.userAgentData && navigator.userAgentData.platform) || navigator.platform || "").toLowerCase();
+    if (/mac|iphone|ipad|ipod/i.test(ua) || plat.includes("mac")) return "mac";
+    if (/win/i.test(ua) || plat.includes("win")) return "windows";
+    if (/linux|x11|cros/i.test(ua) || plat.includes("linux")) return "linux";
+    return "mac";
+  }
+
+  function pickAsset(assets, os) {
+    for (const sfx of matches[os] || []) {
+      const hit = assets.find((a) => a.name.toLowerCase().endsWith(sfx.toLowerCase()));
+      if (hit) return hit.browser_download_url;
+    }
+    return null;
+  }
+
+  function apply(map, ver) {
+    const os = detectOS();
+    document.querySelectorAll("[data-download]").forEach((el) => {
+      const label = el.querySelector("[data-dl-label]");
+      if (label) label.textContent = "Download for " + LABELS[os];
+      if (map[os]) el.href = map[os];
+    });
+    document.querySelectorAll("[data-download-os]").forEach((el) => {
+      const url = map[el.dataset.downloadOs];
+      if (url) el.href = url;
+    });
+    document.querySelectorAll(".dl__os [data-download-os]").forEach((el) => {
+      if (el.dataset.downloadOs === os) el.remove();
+    });
+    if (ver) document.querySelectorAll("[data-version]").forEach((el) => (el.textContent = ver));
+  }
+
+  apply(urls, version);
+
+  (async () => {
+    try {
+      const res = await fetch(`https://api.github.com/repos/${repo}/releases/latest`, {
+        headers: { Accept: "application/vnd.github+json" },
+      });
+      if (!res.ok) return;
+      const data = await res.json();
+      const assets = data.assets || [];
+      const fresh = {};
+      for (const os of Object.keys(matches)) fresh[os] = pickAsset(assets, os) || urls[os] || releasesUrl;
+      apply(fresh, data.tag_name || version);
+    } catch (e) {
+      /* keep the build-time links */
+    }
+  })();
+</script>