:root {
  --bg: #ffffff; --fg: #1a1a1a; --dim: #888; --line: #e2e2e2;
  --link: #2563eb; --broken: #c0392b; --sidebar-bg: #fafafa; --code-bg: #f4f4f5;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181c; --fg: #e4e4e7; --dim: #888; --line: #2a2d34;
    --link: #6ea8fe; --broken: #ff7a6b; --sidebar-bg: #1b1e24; --code-bg: #22252b;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; display: flex; min-height: 100vh;
  font: 16px/1.7 -apple-system, "PingFang TC", "Noto Sans TC", system-ui, sans-serif;
  background: var(--bg); color: var(--fg);
}
#sidebar {
  width: 280px; flex-shrink: 0; padding: 16px; border-right: 1px solid var(--line);
  background: var(--sidebar-bg); height: 100vh; overflow-y: auto; position: sticky; top: 0;
}
.brand { display: block; font-weight: 700; font-size: 18px; color: var(--fg); text-decoration: none; margin-bottom: 12px; }
#search { width: 100%; padding: 7px 10px; border: 1px solid var(--line); border-radius: 7px; background: var(--bg); color: var(--fg); }
#search-results { margin: 8px 0; }
#search-results a { display: block; padding: 5px 8px; border-radius: 6px; color: var(--fg); text-decoration: none; font-size: 14px; }
#search-results a:hover { background: var(--code-bg); }
#tree { margin-top: 10px; font-size: 14px; }
#tree details { margin: 2px 0; }
#tree summary { cursor: pointer; color: var(--dim); font-weight: 600; padding: 2px 0; }
#tree a { display: block; padding: 3px 0 3px 14px; color: var(--fg); text-decoration: none; }
#tree a:hover { color: var(--link); }
main { flex: 1; min-width: 0; padding: 40px 48px; }
.note { max-width: 760px; margin: 0 auto; }
.breadcrumb { color: var(--dim); font-size: 13px; margin-bottom: 8px; }
.note h1 { margin-top: 0; }
.note a { color: var(--link); }
.broken-link { color: var(--broken); border-bottom: 1px dotted var(--broken); cursor: help; }
.note-list { list-style: none; padding: 0; }
.note-list li { padding: 4px 0; }
.dim { color: var(--dim); font-size: 13px; }
pre, code { background: var(--code-bg); border-radius: 6px; }
code { padding: 1px 5px; font-size: 0.9em; }
pre { padding: 14px 16px; overflow-x: auto; }
pre code { padding: 0; background: none; }
img { max-width: 100%; height: auto; }
blockquote { border-left: 3px solid var(--line); margin-left: 0; padding-left: 16px; color: var(--dim); }
table { border-collapse: collapse; }
th, td { border: 1px solid var(--line); padding: 6px 10px; }
#menu-toggle { display: none; }
@media (max-width: 720px) {
  body { flex-direction: column; }
  #sidebar { width: 100%; height: auto; position: static; border-right: none; border-bottom: 1px solid var(--line); }
  #sidebar.collapsed { display: none; }
  main { padding: 20px; }
  #menu-toggle { display: block; position: fixed; top: 8px; right: 12px; z-index: 10; font-size: 20px; background: var(--sidebar-bg); border: 1px solid var(--line); border-radius: 8px; padding: 4px 10px; color: var(--fg); }
}