feat(docs): dark/light mode toggle

Add theme toggle button (top-right, fixed). Persists preference in
localStorage; falls back to prefers-color-scheme. Flash-free via inline
script in <head> that sets data-theme before first paint.
This commit is contained in:
pj committed 2026-04-23 00:38:36 +07:00
1 parent 096461593f
commit 814407925c
2 files changed
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@@ -9,8 +9,23 @@
<link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;700&display=swap">
<link rel="stylesheet" href="__ROOT___assets/style.css">
<style>$highlighting-css$</style>
<script>
const t = localStorage.getItem('theme') || (matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light');
document.documentElement.dataset.theme = t;
</script>
</head>
<body>
<button id="theme-toggle" class="theme-toggle" title="Toggle theme">
<svg class="icon-sun" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
<circle cx="12" cy="12" r="5"/><line x1="12" y1="1" x2="12" y2="3"/><line x1="12" y1="21" x2="12" y2="23"/>
<line x1="4.22" y1="4.22" x2="5.64" y2="5.64"/><line x1="18.36" y1="18.36" x2="19.78" y2="19.78"/>
<line x1="1" y1="12" x2="3" y2="12"/><line x1="21" y1="12" x2="23" y2="12"/>
<line x1="4.22" y1="19.78" x2="5.64" y2="18.36"/><line x1="18.36" y1="5.64" x2="19.78" y2="4.22"/>
</svg>
<svg class="icon-moon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
<path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z"/>
</svg>
</button>
<div class="layout">
<aside class="sidebar">
<a class="brand" href="__ROOT__">sanderling</a>
@@ -68,6 +83,12 @@ for (const diagram of document.querySelectorAll('.mermaid')) {
overlay.classList.add('open');
});
}
document.getElementById('theme-toggle').addEventListener('click', () => {
const next = document.documentElement.dataset.theme === 'dark' ? 'light' : 'dark';
document.documentElement.dataset.theme = next;
localStorage.setItem('theme', next);
});
</script>
</body>
</html>