:root{--ink:#1f2937;--muted:#667085;--line:#e5e7eb;--blue:#2563eb;--soft:#f6f8fb;--dark:#0f172a}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",Arial,sans-serif;color:var(--ink);background:#fff;line-height:1.72}
a{color:var(--blue);text-decoration:none}
.topbar{height:64px;display:flex;align-items:center;justify-content:space-between;padding:0 32px;border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(255,255,255,.96);z-index:10}
.brand{font-size:22px;font-weight:800;color:var(--dark)}
.topbar nav{display:flex;gap:20px}
.topbar nav a{color:#334155;font-weight:600}
.layout{display:grid;grid-template-columns:280px minmax(0,1fr) 260px;gap:32px;max-width:1540px;margin:0 auto;padding:32px}
.sidebar,.toc{position:sticky;top:88px;align-self:start;max-height:calc(100vh - 112px);overflow:auto}
.side-title,.toc-title{font-weight:800;margin-bottom:12px;color:#111827}
.sidebar a{display:block;padding:12px 14px;border:1px solid var(--line);border-radius:8px;margin-bottom:10px;color:#111827;background:#fff}
.sidebar a.active{border-color:#93c5fd;background:#eff6ff;color:#1d4ed8}
.sidebar span{display:block;color:var(--muted);font-size:13px;line-height:1.5;margin-top:4px}
.toc a{display:block;color:#475569;font-size:14px;padding:5px 0;border-left:2px solid transparent;padding-left:10px}
.toc a:hover{border-left-color:#60a5fa;color:#1d4ed8}
.toc .level-3{padding-left:22px;color:#64748b}
.content{min-width:0;max-width:920px}
.hero{background:linear-gradient(135deg,#eef5ff,#f9fbff);border:1px solid #dbeafe;border-radius:10px;padding:28px 32px;margin-bottom:28px}
.hero p{margin:0 0 6px;color:#2563eb;font-weight:700}
.hero h1{margin:0;font-size:34px;line-height:1.25;color:#0f172a}
.hero span{display:block;margin-top:10px;color:#475569}
h1,h2,h3,h4{line-height:1.35;color:#111827}
h2{font-size:25px;border-bottom:1px solid var(--line);padding-bottom:8px;margin-top:36px}
h3{font-size:20px;margin-top:28px}
p,li{font-size:16px}
ul{padding-left:22px}
code{background:#eef2f7;border:1px solid #d8dee8;border-radius:5px;padding:1px 5px;font-family:Consolas,Menlo,monospace;font-size:.94em}
pre{background:#0b1220;color:#e5eefc;border-radius:8px;padding:18px;overflow:auto}
pre code{background:transparent;border:0;color:inherit;padding:0}
table{width:100%;border-collapse:collapse;margin:18px 0;border:1px solid var(--line);font-size:15px}
th,td{border:1px solid var(--line);padding:10px 12px;vertical-align:top}
th{background:#f8fafc;text-align:left}
img{max-width:100%;border:1px solid var(--line);border-radius:8px;margin:12px 0}
@media(max-width:1100px){.layout{grid-template-columns:240px minmax(0,1fr)}.toc{display:none}}
@media(max-width:760px){.topbar{padding:0 16px}.topbar nav{gap:12px;font-size:14px}.layout{display:block;padding:18px}.sidebar{position:static;max-height:none;margin-bottom:20px}.hero{padding:22px}.hero h1{font-size:28px}}