:root {
  --bg: #fdf9f0;
  --card: #ffffff;
  --ink: #3d3428;
  --muted: #8a7f6d;
  --gold: #d9a441;
  --line: #ece4d4;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #201c15;
    --card: #2a251c;
    --ink: #ece4d4;
    --muted: #a99c85;
    --gold: #d9a441;
    --line: #3d362a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  line-height: 1.75;
  font-size: 16px;
}
main {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}
header.site {
  text-align: center;
  padding: 28px 16px 4px;
}
header.site .logo { font-size: 40px; }
header.site h1 { margin: 8px 0 2px; font-size: 24px; }
header.site p { color: var(--muted); margin: 0; font-size: 14px; }
h2 {
  font-size: 18px;
  margin: 32px 0 8px;
  padding-left: 10px;
  border-left: 4px solid var(--gold);
}
p, li { color: var(--ink); }
ul { padding-left: 22px; }
.meta { color: var(--muted); font-size: 14px; }
a { color: var(--gold); }
footer {
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  padding: 24px 16px 40px;
  border-top: 1px solid var(--line);
}
nav.toc {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin: 16px 0 0;
  font-size: 15px;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 8px 24px 20px;
  margin-top: 20px;
}