:root{--bg:#fff;--fg:#1f2328;--muted:#656d76;--line:#d0d7de;--side:#f6f8fa;--accent:#0969da;--code:#f6f8fa;--top:56px}
*{box-sizing:border-box}
html{scroll-padding-top:calc(var(--top) + 12px)}
body{margin:0;color:var(--fg);background:var(--bg);font:15px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
.topbar{position:sticky;top:0;z-index:20;height:var(--top);display:flex;align-items:center;gap:16px;padding:0 20px;background:#24292f;color:#fff}
.brand{color:#fff;font-weight:600;font-size:17px;white-space:nowrap}.brand:hover{text-decoration:none}
.nav-toggle{display:none;background:none;border:0;color:#fff;font-size:20px;cursor:pointer}
.search{position:relative;margin-left:auto;width:min(420px,60vw)}
#q{width:100%;padding:7px 12px;border-radius:6px;border:1px solid #57606a;background:#32383f;color:#fff;font-size:14px;outline:none}
#q:focus{background:#fff;color:var(--fg);border-color:var(--accent)}
#results{position:absolute;top:42px;left:0;right:0;max-height:70vh;overflow:auto;background:#fff;color:var(--fg);border:1px solid var(--line);border-radius:8px;box-shadow:0 8px 24px rgba(0,0,0,.15)}
#results a{display:block;padding:8px 12px;border-bottom:1px solid #eee;color:var(--fg)}
#results a:hover,#results a.sel{background:#eef4ff;text-decoration:none}
#results .rt{font-weight:600}#results .rd{font-size:12px;color:var(--muted)}#results .rx{font-size:13px;color:var(--muted)}
#results mark{background:#fff3a3;color:inherit}#results .empty{padding:12px;color:var(--muted)}
.layout{display:grid;grid-template-columns:290px minmax(0,1fr) 230px}
.sidebar{position:sticky;top:var(--top);height:calc(100vh - var(--top));overflow:auto;background:var(--side);border-right:1px solid var(--line);padding:12px 8px 40px;font-size:14px}
.sidebar ul{list-style:none;margin:0;padding:0}.sidebar ul ul{padding-left:12px}
.sidebar a{display:block;padding:4px 10px;border-radius:6px;color:var(--fg);line-height:1.45}
.sidebar a:hover{background:#eaeef2;text-decoration:none}
.sidebar a.active{background:#ddf4ff;color:var(--accent);font-weight:600}
.sidebar summary{cursor:pointer;padding:5px 6px;font-weight:600;color:#24292f;border-radius:6px}
.sidebar summary:hover{background:#eaeef2}
.content{padding:28px 48px 80px;min-width:0;max-width:1000px}
.crumbs{font-size:13px;color:var(--muted)}
.page-title{margin:4px 0 4px;font-size:30px;line-height:1.3;border-bottom:1px solid var(--line);padding-bottom:10px}
.meta{font-size:12px;color:var(--muted);margin-bottom:20px}
.toc{position:sticky;top:var(--top);height:calc(100vh - var(--top));overflow:auto;padding:28px 16px;font-size:13px}
.toc-inner a{display:block;padding:3px 0 3px 10px;color:var(--muted);border-left:2px solid var(--line);line-height:1.4}
.toc-inner a.h3{padding-left:22px}.toc-inner a.on{color:var(--accent);border-left-color:var(--accent)}
.toc-inner .tt{font-weight:600;color:var(--fg);margin-bottom:6px}
.pager{display:flex;justify-content:space-between;gap:16px;margin-top:48px;padding-top:16px;border-top:1px solid var(--line)}
.pager a{padding:10px 14px;border:1px solid var(--line);border-radius:8px;max-width:48%}
/* markdown */
.markup h1,.markup h2,.markup h3,.markup h4{margin:1.6em 0 .6em;line-height:1.35}
.markup h1{font-size:1.8em;border-bottom:1px solid var(--line);padding-bottom:.3em}
.markup h2{font-size:1.45em;border-bottom:1px solid var(--line);padding-bottom:.3em}
.markup h3{font-size:1.2em}.markup h4{font-size:1.05em}
.markup img{max-width:100%;height:auto;border-radius:4px}
.markup blockquote{margin:1em 0;padding:.2em 1em;color:var(--muted);border-left:4px solid var(--line)}
.markup table{border-collapse:collapse;margin:1em 0;display:block;overflow:auto;max-width:100%}
.markup th,.markup td{border:1px solid var(--line);padding:6px 12px}.markup th{background:var(--side)}
.markup tr:nth-child(2n) td{background:#fafbfc}
.markup code{font-family:Consolas,"SFMono-Regular",Menlo,monospace;font-size:.88em;background:rgba(175,184,193,.2);padding:.15em .4em;border-radius:4px}
.markup pre{position:relative;background:var(--code);border:1px solid var(--line);border-radius:6px;padding:14px 16px;overflow:auto;line-height:1.5}
.markup pre code{background:none;padding:0;font-size:13px;white-space:pre}
.markup pre.mermaid{background:#fff;text-align:center}
.markup hr{border:0;border-top:1px solid var(--line);margin:2em 0}
.markup ul,.markup ol{padding-left:2em}
.copy{position:absolute;top:6px;right:6px;font-size:12px;padding:2px 8px;border:1px solid var(--line);border-radius:4px;background:#fff;cursor:pointer;opacity:0;transition:.15s}
.markup pre:hover .copy{opacity:1}
.site-toc>ul>li{margin-bottom:6px}
/* chroma 代码高亮 (github 风格) */
.chroma .c,.chroma .c1,.chroma .cm,.chroma .cs,.chroma .ch{color:#6e7781;font-style:italic}.chroma .cp,.chroma .cpf{color:#cf222e}
.chroma .k,.chroma .kd,.chroma .kn,.chroma .kr,.chroma .kc,.chroma .kp{color:#cf222e}.chroma .kt{color:#953800}
.chroma .s,.chroma .s1,.chroma .s2,.chroma .sb,.chroma .sc,.chroma .sd,.chroma .se,.chroma .sh,.chroma .si,.chroma .sx,.chroma .sr,.chroma .ss,.chroma .dl{color:#0a3069}
.chroma .m,.chroma .mi,.chroma .mf,.chroma .mh,.chroma .il,.chroma .mo,.chroma .mb{color:#0550ae}
.chroma .nf,.chroma .fm{color:#8250df}.chroma .nc,.chroma .nn{color:#953800}.chroma .nt{color:#116329}.chroma .na,.chroma .nd{color:#0550ae}
.chroma .nb,.chroma .bp,.chroma .no,.chroma .nv,.chroma .vc,.chroma .vg,.chroma .vi{color:#953800}.chroma .o,.chroma .ow{color:#cf222e}
.chroma .gd{color:#82071e;background:#ffebe9}.chroma .gi{color:#116329;background:#dafbe1}.chroma .err{color:#f6f8fa;background:#82071e}
@media (max-width:1200px){.layout{grid-template-columns:270px minmax(0,1fr)}.toc{display:none}}
@media (max-width:800px){.layout{grid-template-columns:1fr}.nav-toggle{display:block}
 .sidebar{position:fixed;left:0;top:var(--top);width:85vw;max-width:320px;z-index:15;transform:translateX(-100%);transition:.2s;box-shadow:2px 0 12px rgba(0,0,0,.15)}
 body.nav-open .sidebar{transform:none}.content{padding:20px 16px 60px}.brand{display:none}.search{width:100%}}
@media print{.topbar,.sidebar,.toc,.pager,.copy{display:none!important}.layout{display:block}.content{padding:0}}
.toplink{color:#fff;font-size:14px;padding:4px 10px;border:1px solid #57606a;border-radius:6px;white-space:nowrap}.toplink:hover{background:#32383f;text-decoration:none}
.muted{color:var(--muted)}
.ver{border:1px solid var(--line);border-radius:8px;padding:12px 16px;margin:14px 0}
.ver-head{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.ver-head h2{margin:0;font-size:1.25em;border:0;padding:0}
.ver-head .muted{font-size:13px}
.dl-btn{margin-left:auto;padding:5px 14px;border-radius:6px;background:#1f883d;color:#fff;font-size:14px}.dl-btn:hover{background:#1a7f37;text-decoration:none}
.dl-btn.disabled{background:#d0d7de;pointer-events:none}
.ver summary{cursor:pointer;color:var(--muted);font-size:13px;margin-top:6px}.ver .notes{font-size:14px}