:root {
  --bg: #fbfbfa;
  --fg: #1f2328;
  --muted: #5f6670;
  --line: #e3e4e6;
  --accent: #2257c5;
  --notice: #fff4d6;
  --notice-line: #e7c46a;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171a;
    --fg: #e6e7e9;
    --muted: #a0a6ae;
    --line: #30343a;
    --accent: #7aa7ff;
    --notice: #3a3220;
    --notice-line: #8c7536;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.8 -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
}
a { color: var(--accent); }
header.site, main, footer.site { max-width: 760px; margin: 0 auto; padding: 0 16px; }
header.site { display: flex; align-items: baseline; gap: 12px; padding-top: 20px; padding-bottom: 12px; border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; font-size: 20px; text-decoration: none; color: var(--fg); }
.tag { color: var(--muted); font-size: 14px; }
h1 { font-size: 28px; line-height: 1.3; margin: 32px 0 8px; }
h2 { font-size: 20px; margin: 36px 0 8px; scroll-margin-top: 16px; }
p { margin: 0 0 14px; scroll-margin-top: 16px; }
p:target { background: var(--notice); }
.num { font-weight: 600; text-decoration: none; color: var(--fg); margin-right: 2px; }
.items { margin: 6px 0 0; padding-left: 0; list-style: none; }
.items li { padding-left: 2.2em; text-indent: -2.2em; }
.meta { display: grid; grid-template-columns: auto 1fr; gap: 0 12px; color: var(--muted); font-size: 14px; margin: 0 0 24px; }
.meta dd { margin: 0; }
.intro { padding-bottom: 8px; }
.toc { border: 1px solid var(--line); border-radius: 8px; padding: 4px 16px 8px; margin: 16px 0; }
.toc h2 { font-size: 15px; margin: 8px 0 4px; }
.toc ol { margin: 0; padding-left: 1.6em; columns: 2; column-gap: 24px; font-size: 15px; }
@media (max-width: 560px) { .toc ol { columns: 1; } }
.notice { border: 1px solid var(--notice-line); background: var(--notice); border-radius: 8px; padding: 10px 14px; margin-top: 24px; }
.history { border-top: 1px solid var(--line); margin-top: 40px; font-size: 14px; color: var(--muted); }
.history h2 { font-size: 16px; }
.docs { list-style: none; padding: 0; }
.docs li { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding: 10px 0; border-bottom: 1px solid var(--line); }
.docs span { color: var(--muted); font-size: 14px; }
footer.site { border-top: 1px solid var(--line); margin-top: 48px; padding-top: 16px; padding-bottom: 32px; font-size: 14px; color: var(--muted); }
footer.site nav { display: flex; flex-wrap: wrap; gap: 4px 16px; margin-bottom: 8px; }