:root {
  color-scheme: light;
  --bg: #f4f6fb;
  --fg: #1e293b;
  --title: #0f172a;
  --muted: #64748b;
  --link: #047857;
  --code: #eef2f7;
  --card: #ffffff;
  --border: rgba(15, 23, 42, 0.12);
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #060a12;
    --fg: #c9d5e8;
    --title: #f1f5fb;
    --muted: #94a3b8;
    --link: #6ee7b7;
    --code: #121c30;
    --card: #0e1626;
    --border: rgba(148, 163, 184, 0.18);
  }
}
* { box-sizing: border-box; }
body {
  margin: 0 auto;
  max-width: 780px;
  padding: 32px 20px 96px;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.9 "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}
nav.top {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  padding-bottom: 14px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}
nav.top a { color: var(--muted); text-decoration: none; }
nav.top a:hover { color: var(--link); }
h1 { font-size: 1.45em; line-height: 1.4; margin: 0 0 6px; color: var(--title); }
h2 { font-size: 1.12em; margin: 30px 0 10px; color: var(--title); }
p, li { margin: 8px 0; }
ul, ol { padding-left: 22px; }
a { color: var(--link); }
code { background: var(--code); padding: 2px 6px; border-radius: 6px; font-size: 0.9em; }
pre { background: var(--code); padding: 12px 14px; border-radius: 10px; overflow-x: auto; font-size: 13px; line-height: 1.6; }
table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 13.5px; }
th, td { border: 1px solid var(--border); padding: 7px 10px; text-align: left; }
th { background: var(--code); font-weight: 600; }
.meta { color: var(--muted); font-size: 12.5px; margin-bottom: 22px; }
.note { border-left: 3px solid var(--link); background: var(--code); padding: 10px 14px; border-radius: 0 8px 8px 0; font-size: 13.5px; margin: 14px 0; }
footer.bottom { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--border); color: var(--muted); font-size: 12.5px; }
footer.bottom a { color: var(--muted); margin-right: 12px; }
.card { display: block; background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 16px 18px; margin: 14px 0; text-decoration: none; color: inherit; }
.card:hover { border-color: var(--link); }
.card b { color: var(--title); }