:root {
  --bg: #f5f8f8;
  --surface: #ffffff;
  --text: #13262b;
  --muted: #55686d;
  --accent: #0d9488;
  --accent-strong: #0f5e6e;
  --accent-soft: #e0f4f1;
  --amber: #b45309;
  --border: #dbe4e6;
  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1719;
    --surface: #152226;
    --text: #e6eff0;
    --muted: #9fb2b6;
    --accent: #2dd4bf;
    --accent-strong: #5eead4;
    --accent-soft: #153a38;
    --amber: #fbbf24;
    --border: #25383c;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Apple SD Gothic Neo", "PingFang SC", "Noto Sans CJK", Roboto, sans-serif;
  overflow-wrap: anywhere;
}
a { color: var(--accent); }
a:hover { color: var(--accent-strong); }
header.site, main, footer.site { max-width: 820px; margin: 0 auto; padding: 0 16px; }
header.site { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 16px; padding-top: 18px; padding-bottom: 10px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.1rem; color: var(--text); text-decoration: none; }
.brand img { border-radius: 8px; }
nav.pages { display: flex; flex-wrap: wrap; gap: 4px 14px; font-size: .95rem; }
nav.pages a { color: var(--muted); text-decoration: none; padding: 4px 0; }
nav.pages a[aria-current="page"] { color: var(--accent); font-weight: 600; border-bottom: 2px solid var(--accent); }
main { padding-bottom: 32px; }
h1 { font-size: 1.9rem; line-height: 1.3; margin: 20px 0 8px; text-wrap: balance; word-break: auto-phrase; }
h2 { font-size: 1.2rem; margin: 30px 0 8px; }
.meta { color: var(--muted); font-size: .9rem; margin-top: 0; }
ul { padding-left: 1.3em; }
li { margin: 4px 0; }
.toc { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 10px 18px; margin: 16px 0; }
.toc ol { margin: 6px 0; padding-left: 0; list-style: none; }
section[id] { scroll-margin-top: 12px; }
.table { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: .93rem; background: var(--surface); }
th, td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: var(--accent-soft); }
details { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 10px 16px; margin: 10px 0; }
summary { cursor: pointer; font-weight: 600; }
details p { margin: 8px 0 2px; }
.hero { display: flex; gap: 24px; align-items: center; margin: 24px 0 8px; }
.hero-icon { border-radius: 28px; box-shadow: 0 10px 30px rgba(15, 94, 110, .25); flex: none; }
.lead { font-size: 1.1rem; color: var(--muted); margin: 6px 0 10px; }
.badge { display: inline-block; background: var(--accent-soft); color: var(--accent-strong); border-radius: 999px; padding: 4px 14px; font-size: .9rem; font-weight: 600; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(300px, 100%), 1fr)); gap: 14px; margin: 24px 0; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 4px 18px 10px; }
.card h2 { font-size: 1.05rem; margin-top: 14px; }
.note { color: var(--muted); font-size: .92rem; }
footer.site { border-top: 1px solid var(--border); padding-top: 14px; padding-bottom: 32px; color: var(--muted); font-size: .88rem; }
nav.langs { display: flex; flex-wrap: wrap; gap: 4px 14px; margin-bottom: 6px; }
nav.langs a { color: var(--muted); }
nav.langs a[aria-current="true"] { color: var(--accent); font-weight: 600; }
.picker { text-align: center; padding-top: 60px; }
.picker ul { list-style: none; padding: 0; }
.picker li { margin: 10px 0; font-size: 1.1rem; }
@media (max-width: 560px) {
  h1 { font-size: 1.5rem; }
  .hero { flex-direction: column; align-items: flex-start; gap: 12px; }
  .hero-icon { width: 88px; height: 88px; border-radius: 20px; }
}