:root{
  --bg:#f6f7f9;--paper:#ffffff;--ink:#1f2328;--muted:#59636e;--line:#d0d7de;
  --accent:#2e75b6;--accent-2:#548235;--warn:#c55a11;--code:#f0f2f5;
  --sidebar:260px;--maxw:1240px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.7 "Segoe UI","Helvetica Neue","PingFang SC","Microsoft YaHei",Arial,sans-serif}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
header.top{position:sticky;top:0;z-index:20;background:#ffffffee;backdrop-filter:blur(6px);border-bottom:1px solid var(--line)}
header.top .in{max-width:calc(var(--maxw) + var(--sidebar) + 48px);margin:0 auto;padding:10px 24px;display:flex;align-items:center;gap:16px}
header.top .brand{font-weight:700;font-size:17px;color:var(--ink)}
header.top .brand small{font-weight:500;color:var(--muted);margin-left:8px;font-size:12px}
header.top nav{margin-left:auto;display:flex;gap:18px;font-size:14px}
.wrap{max-width:calc(var(--maxw) + var(--sidebar) + 48px);margin:0 auto;padding:24px;display:grid;grid-template-columns:var(--sidebar) minmax(0,1fr);gap:28px}
.wrap.single{grid-template-columns:minmax(0,1fr)}
aside.side{position:sticky;top:64px;align-self:start;max-height:calc(100vh - 80px);overflow:auto;font-size:13.5px}
aside.side h4{margin:0 0 8px;color:var(--muted);font-weight:600;font-size:12px;letter-spacing:.06em;text-transform:uppercase}
aside.side ol{list-style:none;margin:0 0 18px;padding:0}
aside.side li{margin:2px 0}
aside.side li a{display:block;padding:5px 10px;border-radius:6px;color:var(--ink)}
aside.side li a:hover{background:#e9eef5;text-decoration:none}
aside.side li a.cur{background:var(--accent);color:#fff;font-weight:600}
aside.side .toc a{color:var(--muted);padding:3px 10px 3px 18px;font-size:12.5px}
main.doc{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:36px 44px;min-width:0}
main.doc h1{font-size:28px;line-height:1.3;margin:0 0 6px}
main.doc h2{font-size:21px;margin:40px 0 12px;padding-bottom:6px;border-bottom:1px solid var(--line)}
main.doc h3{font-size:17px;margin:28px 0 8px}
main.doc h4{font-size:15px;margin:20px 0 6px;color:var(--muted)}
main.doc p.lead{color:var(--muted);font-size:15.5px;margin:0 0 20px}
main.doc code{background:var(--code);padding:1px 5px;border-radius:4px;font-size:.88em;font-family:"JetBrains Mono","SF Mono",Menlo,Consolas,monospace}
main.doc pre{background:#0f172a;color:#e2e8f0;padding:14px 16px;border-radius:8px;overflow:auto;font-size:12.8px;line-height:1.55}
main.doc pre code{background:none;padding:0;color:inherit;font-size:inherit}
main.doc table{border-collapse:collapse;width:100%;margin:14px 0;font-size:13.8px;display:block;overflow-x:auto}
main.doc th,main.doc td{border:1px solid var(--line);padding:7px 10px;vertical-align:top;text-align:left}
main.doc th{background:#eef2f7;font-weight:600}
main.doc tr:nth-child(even) td{background:#fafbfc}
main.doc blockquote{margin:14px 0;padding:10px 16px;border-left:4px solid var(--accent);background:#f3f7fc;color:#334155;border-radius:0 8px 8px 0}
main.doc .admonition{margin:16px 0;padding:12px 16px;border-radius:8px;border:1px solid var(--line);background:#f8fafc}
main.doc .admonition-title{font-weight:700;margin:0 0 4px}
main.doc .admonition.note{border-color:#9cc3e6;background:#eef6fc}
main.doc .admonition.warning{border-color:#f0b27a;background:#fff4e8}
main.doc .admonition.tip{border-color:#a9d18e;background:#f1f8ec}
main.doc .admonition.source{border-color:#c9c9c9;background:#f6f6f6;font-size:13.5px}
main.doc hr{border:0;border-top:1px solid var(--line);margin:32px 0}
figure{margin:18px 0}
figure img{width:100%;height:auto;display:block;background:#fff;border:1px solid var(--line);border-radius:8px}
figure figcaption{font-size:13.5px;color:var(--ink);margin-top:8px;text-align:center;font-weight:600}

.pair{display:grid;grid-template-columns:1fr;gap:22px;margin:18px 0}
.pair.rt-pair{gap:10px}
.fig{margin:0;border:2px solid var(--line);border-radius:12px;overflow:hidden;background:#fff}
.fig.nonrt{border-color:#2e75b6}
.fig.rt{border-color:#548235}
.fig img{border:0;border-radius:0}
.fig-head{display:flex;align-items:center;gap:12px;padding:9px 16px;font-size:14.5px;font-weight:600;line-height:1.4}
.fig.nonrt .fig-head{background:#deebf7;color:#1f4e79}
.fig.rt .fig-head{background:#e2f0d9;color:#385723}
.fig-badge{flex:none;font-size:12px;font-weight:800;letter-spacing:.06em;padding:3px 12px;border-radius:14px;color:#fff;background:#1f4e79}
.fig.rt .fig-badge{background:#385723}
.pair-vs{display:flex;align-items:center;gap:12px;color:var(--muted);font-size:13px;font-weight:600}
.pair-vs::before,.pair-vs::after{content:'';flex:1;border-top:2px dashed #c9d2dc}
.pair-vs span{padding:2px 14px;border:1px solid #c9d2dc;border-radius:14px;background:#f8fafc}
.pair-vs span::after{content:' ▼';color:#548235}
.pair figure{margin:0}
.pair.side{grid-template-columns:1fr 1fr}
.layer{display:inline-block;font-size:11px;font-weight:700;letter-spacing:.05em;padding:1px 7px;border-radius:10px;background:#e9eef5;color:#334155;margin-right:6px;vertical-align:middle}
.layer.l2{background:#fff0e0;color:#8a4b12}
.tag{display:inline-block;font-size:11.5px;padding:1px 8px;border-radius:10px;background:#eef2f7;color:#334155;margin-right:4px}
.tag.rt{background:#e2f0d9;color:#385723}.tag.nonrt{background:#deebf7;color:#1f4e79}.tag.bad{background:#fbe5d6;color:#843c0c}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px;margin:20px 0}
.card{display:block;background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:20px 22px;color:var(--ink);transition:box-shadow .15s,transform .15s}
.card:hover{box-shadow:0 8px 24px rgba(0,0,0,.08);transform:translateY(-2px);text-decoration:none}
.card h3{margin:0 0 6px;font-size:17px}
.card p{margin:0;color:var(--muted);font-size:13.8px}
.card .meta{margin-top:10px;font-size:12px;color:var(--muted)}
.hero{background:linear-gradient(135deg,#1f4e79,#2e75b6 60%,#548235);color:#fff;border-radius:14px;padding:36px 40px;margin-bottom:26px}
.hero h1{margin:0 0 8px;font-size:30px}
.hero p{margin:0;opacity:.92;max-width:760px}
.hero .kv{display:flex;gap:22px;flex-wrap:wrap;margin-top:18px;font-size:13px;opacity:.95}
.hero .kv span b{display:block;font-size:15px}
.pagenav{display:flex;justify-content:space-between;gap:16px;margin-top:40px;padding-top:16px;border-top:1px solid var(--line);font-size:14px}
.pagenav a{padding:10px 14px;border:1px solid var(--line);border-radius:8px;max-width:48%}
.pagenav a:hover{background:#f3f7fc;text-decoration:none}
footer.foot{max-width:calc(var(--maxw) + var(--sidebar) + 48px);margin:0 auto;padding:18px 24px 40px;color:var(--muted);font-size:12.5px}
.toc-inline{background:#f8fafc;border:1px solid var(--line);border-radius:8px;padding:10px 18px;font-size:13.5px;margin:14px 0 24px}
.toc-inline ul{margin:4px 0;padding-left:18px}
.kbd{font-family:Menlo,monospace;font-size:.85em;background:#eee;border:1px solid #ccc;border-radius:4px;padding:0 4px}
@media (max-width:980px){.wrap{grid-template-columns:1fr}aside.side{position:static;max-height:none}.pair{grid-template-columns:1fr}main.doc{padding:24px 20px}}