* {
  box-sizing: border-box;
}

html,
body,
#root {
  height: 100%;
}

body {
  margin: 0;
  background: var(--shell);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: var(--t-3);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--selection);
}

button {
  font-family: inherit;
  color: inherit;
  border: 0;
  background: none;
  cursor: pointer;
  padding: 0;
}

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

.titlebar {
  flex: none;
  height: 46px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 14px 0 84px;
  background: var(--shell);
  border-bottom: 1px solid var(--line);
}

.titlebar .doc-title {
  grid-column: 2;
  font-size: var(--t-2);
  letter-spacing: 0.02em;
  color: var(--ink-soft);
}

.titlebar .actions {
  grid-column: 3;
  justify-self: end;
  display: flex;
  gap: 4px;
}

.icon-btn {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: var(--r-sm);
  color: var(--ink-soft);
  transition: background 120ms var(--ease), color 120ms var(--ease);
}

.icon-btn:hover {
  background: var(--accent-wash);
  color: var(--ink);
}

.icon-btn[data-on="true"] {
  color: var(--accent);
}

.dirty-dot {
  display: inline-block;
  width: 5px;
  height: 5px;
  margin-left: 8px;
  border-radius: 50%;
  background: var(--accent);
  vertical-align: middle;
}

.body {
  flex: 1;
  display: flex;
  min-height: 0;
}

.sidebar {
  width: var(--pane-sidebar);
  flex: none;
  background: var(--sidebar);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  padding: 6px 0 10px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 18px 16px;
  color: var(--ink-faint);
  cursor: pointer;
  transition: color 120ms var(--ease);
}

.brand .mark {
  font-family: var(--font-book);
  font-size: 19px;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink);
  transition: color 120ms var(--ease);
}

.brand:hover,
.brand:hover .mark {
  color: var(--accent);
}

.nav-label {
  padding: 4px 22px;
  font-size: var(--t-1);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.chapters {
  list-style: none;
  margin: 6px 0 0;
  padding: 0 10px;
  overflow-y: auto;
  flex: 1;
}

.chapter {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 11px;
  padding: 8px 12px;
  border-radius: var(--r-sm);
  color: var(--ink-soft);
  cursor: pointer;
  transition: background 120ms var(--ease), color 120ms var(--ease);
}

.chapter:hover {
  background: rgba(35, 32, 27, 0.04);
  color: var(--ink);
}

.chapter[data-active="true"] {
  background: var(--paper);
  color: var(--ink);
  box-shadow: 0 1px 2px rgba(35, 32, 27, 0.05);
}

.chapter[data-active="true"]::before {
  content: "";
  position: absolute;
  left: -10px;
  top: 8px;
  bottom: 8px;
  width: 3px;
  background: var(--accent);
  border-radius: 0 2px 2px 0;
}

.chapter .num {
  font-size: var(--t-1);
  color: var(--ink-faint);
  width: 13px;
  font-variant-numeric: tabular-nums;
}

.chapter[data-active="true"] .num {
  color: var(--accent);
}

.add-chapter {
  margin: 8px 18px 4px;
  padding: 9px 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-radius: var(--r-sm);
  color: var(--ink-faint);
  border: 1px dashed var(--line-strong);
  transition: color 120ms var(--ease), border-color 120ms var(--ease);
}

.add-chapter:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.editor-pane {
  flex: 1;
  min-width: 0;
  background: var(--paper);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.sheet {
  width: 100%;
  max-width: var(--measure);
  padding: 104px 24px 200px;
}

.prose {
  font-family: var(--font-book);
  color: var(--ink);
  font-optical-sizing: auto;
}

.chapter-opener {
  text-align: center;
  margin: 0 0 3.4rem;
}

.chapter-num {
  font-family: var(--font-ui);
  font-size: var(--t-1);
  font-weight: 600;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.chapter-title {
  font-weight: 500;
  font-size: 31px;
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 15px 0 0;
}

.prose p {
  font-size: 19px;
  line-height: 1.68;
  margin: 0;
  text-align: justify;
  hyphens: auto;
  -webkit-hyphens: auto;
  text-indent: 1.3em;
}

.prose p:first-of-type,
.prose .first {
  text-indent: 0;
}

.prose .first::first-letter {
  float: left;
  font-size: 3.1em;
  line-height: 0.82;
  padding: 0.05em 0.09em 0 0;
  font-weight: 500;
}

.prose blockquote {
  margin: 1.7rem 0;
  padding-left: 1.2rem;
  border-left: 2px solid var(--line-strong);
  font-style: italic;
  color: var(--ink-soft);
}

.prose blockquote p {
  text-indent: 0;
  font-size: 18px;
}

.scene-break {
  text-align: center;
  margin: 2.1rem 0;
  color: var(--ink-faint);
  font-size: 17px;
  letter-spacing: 0.5em;
}

.dock {
  width: var(--pane-dock);
  flex: none;
  background: var(--shell);
  border-left: 1px solid var(--line);
  overflow-y: auto;
  padding: 26px 28px 80px;
}

.dock-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.dock-head .label {
  font-size: var(--t-1);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.dock-head .meta {
  font-size: var(--t-1);
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}

.page {
  background: #fffefb;
  border: 1px solid var(--line);
  border-radius: 2px;
  box-shadow: var(--shadow-page);
  aspect-ratio: 6 / 9;
  padding: 11% 12%;
  overflow: hidden;
}

.page .p-opener {
  text-align: center;
  margin-bottom: 15px;
}

.page .p-num {
  font-family: var(--font-ui);
  font-size: 6px;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.page .p-title {
  font-family: var(--font-book);
  font-size: 12px;
  margin-top: 5px;
}

.page p {
  font-family: var(--font-book);
  font-size: 6.6px;
  line-height: 1.5;
  text-align: justify;
  hyphens: auto;
  text-indent: 1.2em;
  margin: 0;
  color: #2b2720;
}

.page .folio {
  text-align: center;
  font-family: var(--font-book);
  font-size: 6px;
  color: var(--ink-faint);
  margin-top: 16px;
}

::-webkit-scrollbar {
  width: 11px;
  height: 11px;
}

::-webkit-scrollbar-thumb {
  background: rgba(35, 32, 27, 0.16);
  border-radius: 6px;
  border: 3px solid transparent;
  background-clip: content-box;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(35, 32, 27, 0.28);
  background-clip: content-box;
}

::-webkit-scrollbar-track {
  background: transparent;
}

.chapter-title-input {
  width: 100%;
  margin: 15px 0 0;
  padding: 0;
  border: 0;
  background: transparent;
  text-align: center;
  font-family: var(--font-book);
  font-weight: 500;
  font-size: 31px;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.chapter-title-input:focus {
  outline: none;
}

.chapter-title-input::placeholder {
  color: var(--ink-faint);
}

.editor-host,
.ProseMirror {
  outline: none;
}

.ProseMirror {
  min-height: 62vh;
}

.ProseMirror > p:first-child {
  text-indent: 0;
}

.ProseMirror hr {
  border: none;
  border-top: 1px solid var(--line-strong);
  width: 56px;
  margin: 2rem auto;
}

.ProseMirror p.is-editor-empty:first-child::before {
  content: attr(data-placeholder);
  color: var(--ink-faint);
  float: left;
  height: 0;
  pointer-events: none;
}

.page-body hr {
  border: none;
  border-top: 1px solid var(--line-strong);
  width: 22px;
  margin: 9px auto;
}

.editor-toolbar {
  position: sticky;
  bottom: 22px;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 1px;
  padding: 5px;
  background: rgba(252, 251, 247, 0.86);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid var(--line);
  border-radius: 999px;
  box-shadow: var(--shadow-pop);
}

.tool {
  min-width: 32px;
  height: 32px;
  padding: 0 9px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  color: var(--ink-soft);
  font-family: var(--font-book);
  font-size: 15px;
  transition: background 120ms var(--ease), color 120ms var(--ease);
}

.tool:hover {
  background: var(--accent-wash);
  color: var(--ink);
}

.tool[data-on="true"] {
  background: var(--accent);
  color: #fff;
}

.tool-sep {
  width: 1px;
  height: 18px;
  background: var(--line);
  margin: 0 5px;
}

.figure {
  margin: 1.8rem 0;
}

.figure img {
  display: block;
  width: 100%;
  border-radius: 2px;
}

.figure[data-placement="float-top"] {
  float: right;
  width: 46%;
  margin: 0.2rem 0 1rem 1.4rem;
}

.figure[data-placement="inline"] {
  width: 62%;
  margin-inline: auto;
}

.figure-frame {
  background: var(--sidebar);
  border-radius: 3px;
  overflow: hidden;
}

.figure-empty {
  aspect-ratio: 3 / 2;
  display: grid;
  place-items: center;
  font-family: var(--font-ui);
  font-size: var(--t-2);
  color: var(--ink-faint);
}

.figure-caption {
  display: block;
  width: 100%;
  margin-top: 9px;
  border: 0;
  background: transparent;
  text-align: center;
  font-family: var(--font-ui);
  font-size: var(--t-2);
  color: var(--ink-soft);
}

.figure-caption:focus {
  outline: none;
}

.figure-caption::placeholder {
  color: var(--ink-faint);
}

.figure[data-selected="true"] .figure-frame {
  box-shadow: 0 0 0 2px var(--accent);
}

.figure-controls {
  display: flex;
  gap: 4px;
  justify-content: center;
  margin-top: 9px;
}

.figure-controls button {
  font-family: var(--font-ui);
  font-size: var(--t-1);
  padding: 5px 10px;
  border-radius: 999px;
  color: var(--ink-soft);
  background: var(--sidebar);
  transition: background 120ms var(--ease), color 120ms var(--ease);
}

.figure-controls button[data-on="true"] {
  background: var(--accent);
  color: #fff;
}

.pdf-pages {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.pdf-page {
  display: block;
  border-radius: 2px;
  box-shadow: var(--shadow-page);
}

.dock-error {
  white-space: pre-wrap;
  font-family: var(--font-ui);
  font-size: var(--t-2);
  line-height: 1.5;
  color: var(--accent-ink);
  background: var(--accent-wash);
  padding: 12px 14px;
  border-radius: var(--r-sm);
  margin: 0;
}

.dock-empty {
  font-family: var(--font-ui);
  font-size: var(--t-2);
  color: var(--ink-faint);
  text-align: center;
  padding: 44px 0;
}

.overlay {
  position: fixed;
  inset: 0;
  z-index: 20;
  background: rgba(35, 32, 27, 0.28);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
  display: grid;
  place-items: center;
  padding: 40px;
}

.panel {
  width: 480px;
  max-width: 100%;
  max-height: 100%;
  display: flex;
  flex-direction: column;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-pop);
  overflow: hidden;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 14px 16px 22px;
  border-bottom: 1px solid var(--line);
}

.panel-head h2 {
  margin: 0;
  font-family: var(--font-book);
  font-weight: 500;
  font-size: 18px;
}

.panel-body {
  display: flex;
  flex-direction: column;
  gap: 15px;
  padding: 20px 22px 24px;
  overflow-y: auto;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field-label {
  font-family: var(--font-ui);
  font-size: var(--t-1);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.field input,
.field select {
  font-family: var(--font-ui);
  font-size: var(--t-4);
  color: var(--ink);
  background: var(--raised);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-sm);
  padding: 9px 11px;
}

.field input:focus,
.field select:focus {
  outline: none;
  border-color: var(--accent);
}

.field-row {
  display: flex;
  gap: 14px;
}

.field-row .field {
  flex: 1;
}

.check {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-ui);
  font-size: var(--t-3);
  color: var(--ink-soft);
}

.check input {
  width: 15px;
  height: 15px;
  accent-color: var(--accent);
}

.doc-title {
  cursor: pointer;
}

.doc-title:hover {
  color: var(--ink);
}

.menu-wrap {
  position: relative;
}

.menu-backdrop {
  position: fixed;
  inset: 0;
  z-index: 25;
}

.menu {
  position: absolute;
  top: 36px;
  right: 0;
  z-index: 30;
  min-width: 156px;
  display: flex;
  flex-direction: column;
  padding: 5px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-pop);
}

.menu button {
  text-align: left;
  padding: 8px 11px;
  border-radius: var(--r-sm);
  font-family: var(--font-ui);
  font-size: var(--t-3);
  color: var(--ink-soft);
}

.menu button:hover {
  background: var(--accent-wash);
  color: var(--ink);
}

.toast {
  position: fixed;
  bottom: 26px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 40;
  max-width: 460px;
  padding: 11px 16px;
  border-radius: var(--r-md);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-ui);
  font-size: var(--t-3);
  box-shadow: var(--shadow-pop);
  cursor: pointer;
}

.library {
  height: 100vh;
  overflow-y: auto;
  background: var(--shell);
}

.library-head {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 30px 44px 8px;
}

.library-head .mark {
  font-family: var(--font-book);
  font-size: 23px;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.library-head .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.shelf {
  max-width: 1040px;
  margin: 0 auto;
  padding: 26px 44px 80px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(168px, 1fr));
  gap: 28px;
}

.card {
  position: relative;
  aspect-ratio: 5 / 7;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 22px 18px;
  text-align: center;
  border-radius: 4px;
  cursor: pointer;
  transition: transform 140ms var(--ease), box-shadow 140ms var(--ease);
}

.card:hover {
  transform: translateY(-3px);
}

.card-book,
.card-example {
  background: #fffefb;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-page);
}

.card-book:hover,
.card-example:hover {
  box-shadow: 0 4px 10px rgba(35, 32, 27, 0.1), 0 20px 38px rgba(35, 32, 27, 0.13);
}

.card-title {
  font-family: var(--font-book);
  font-size: 20px;
  font-weight: 500;
  line-height: 1.18;
  color: var(--ink);
}

.card-author {
  font-family: var(--font-ui);
  font-size: var(--t-2);
  color: var(--ink-soft);
}

.card-badge {
  font-family: var(--font-ui);
  font-size: var(--t-1);
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

.card-action {
  background: transparent;
  border: 1px dashed var(--line-strong);
  color: var(--ink-faint);
  font-family: var(--font-ui);
  font-size: var(--t-3);
}

.card-action:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.card-delete {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--ink-faint);
  opacity: 0;
  transition: opacity 120ms var(--ease), background 120ms var(--ease), color 120ms var(--ease);
}

.card-book:hover .card-delete {
  opacity: 1;
}

.card-delete:hover {
  background: var(--accent-wash);
  color: var(--accent);
}

.panel-foot {
  display: flex;
  justify-content: flex-end;
  padding: 14px 22px;
  border-top: 1px solid var(--line);
}

.btn-primary {
  font-family: var(--font-ui);
  font-size: var(--t-3);
  font-weight: 500;
  padding: 9px 20px;
  border-radius: var(--r-sm);
  background: var(--accent);
  color: #fff;
  transition: background 120ms var(--ease);
}

.btn-primary:hover {
  background: var(--accent-ink);
}