:root {
  color-scheme: light dark;
  --bg: #fbfaf7;
  --fg: #1c1c1e;
  --muted: #6b6b6b;
  --line: #e7e2d6;
  --accent: #b98a2c;
  --card: #ffffff;
  --code-bg: #f3efe6;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11100d;
    --fg: #f1efe9;
    --muted: #a39e92;
    --line: #2a2823;
    --accent: #fbc95b;
    --card: #1b1a16;
    --code-bg: #1f1d18;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code, pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 14px;
  background: var(--code-bg);
  padding: 1px 6px;
  border-radius: 4px;
}
.nav {
  border-bottom: 1px solid var(--line);
  background: rgba(251, 250, 247, 0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  position: sticky; top: 0; z-index: 10;
}
@media (prefers-color-scheme: dark) {
  .nav { background: rgba(17, 16, 13, 0.85); }
}
.nav-inner {
  max-width: 720px; margin: 0 auto;
  padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 700; font-size: 16px; color: var(--fg);
}
.nav-logo:hover { text-decoration: none; }
.nav-logo-mark {
  display: inline-block;
  width: 28px; height: 28px;
  border-radius: 8px;
  object-fit: cover;
  vertical-align: middle;
}
.brand-icon {
  display: block;
  width: 96px; height: 96px;
  border-radius: 22px;
  margin: 0 auto 18px;
  box-shadow: 0 8px 24px rgba(185, 138, 44, 0.18);
}
.nav-back { font-size: 14px; color: var(--muted); }
main {
  max-width: 720px; margin: 0 auto;
  padding: 56px 24px 64px;
}
.doc-header { margin-bottom: 40px; }
.doc-badge {
  display: inline-block;
  padding: 4px 12px; border-radius: 999px;
  background: rgba(251, 201, 91, 0.18);
  color: var(--accent);
  font-size: 11px; font-weight: 700; letter-spacing: 1.5px;
}
.doc-title {
  font-size: 36px; line-height: 1.25;
  margin: 16px 0 12px;
}
.doc-meta {
  color: var(--muted); font-size: 14px;
}
h2 {
  font-size: 22px;
  margin: 48px 0 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line);
}
h3 {
  font-size: 17px;
  margin: 24px 0 8px;
}
p, li { color: var(--fg); }
ul, ol { padding-left: 24px; }
li { margin: 4px 0; }
.summary-list {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px 24px 20px 44px;
  list-style: none;
  margin: 24px 0;
}
.summary-list li { padding: 4px 0; }
.doc-footer {
  border-top: 1px solid var(--line);
  padding: 24px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}
.doc-footer p { margin: 6px 0; }
@media (max-width: 540px) {
  main { padding: 32px 20px 48px; }
  .doc-title { font-size: 28px; }
  h2 { font-size: 19px; }
}