:root {
  --paper:#f8f7f2;--panel:#fffefa;--ink:#202c43;--muted:#59657a;--line:#d9dcd6;
  --blue:#334f99;--blue-dark:#27375f;--wash:#edf1f9;--butter:#eee8ce;
  --font:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  font-family:var(--font);color:var(--ink);background:var(--paper);font-size:16px;line-height:1.6;
}
*{box-sizing:border-box}html{scroll-padding-top:24px}body{margin:0}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer}
img,svg{max-width:100%}button,input,a,summary,[tabindex]{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid #597ac1;outline-offset:4px}
[hidden]{display:none!important}::selection{background:#d7e2ff;color:#112748}
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.site-bar{border-bottom:1px solid var(--line);background:var(--paper)}.head-inner,.foot-inner{display:flex;align-items:center;justify-content:space-between;gap:20px}.head-inner{min-height:76px}.brand{display:inline-flex;align-items:center;gap:10px;color:#243352}.brand>span{display:flex;align-items:baseline;gap:10px}.brand b{font-size:17px;letter-spacing:-.45px}.brand small{font-size:13px;color:#63718a;letter-spacing:.05em}.head-inner nav{display:flex;align-items:center;gap:30px;font-size:14px;font-weight:600}.head-inner nav a{padding:9px 0}.head-inner nav a:last-child{padding:7px 12px;border:1px solid #bfc8d5;border-radius:5px}.head-inner nav a:hover,.foot-inner a:hover,.breadcrumbs a:hover{color:var(--blue);text-decoration:underline}
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.downloads{background:#27385d;color:#fbfcff;display:grid;grid-template-columns:minmax(0,1.45fr) minmax(220px,.8fr);gap:28px;align-items:center;padding:32px clamp(18px,3vw,42px);margin:20px 0 44px;border-radius:8px}.downloads .eyebrow{color:#bbcbee}.downloads h2{font-size:clamp(23px,2.2vw,35px);letter-spacing:-.035em;margin:5px 0 4px;line-height:1.35}.downloads p{color:#d4dfef;font-size:14px;line-height:1.7}.download-links{display:grid;gap:9px}.download-links a{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:9px 13px;border:1px solid #9baccf;border-radius:4px;font-size:14px;font-weight:600}.download-links a:hover{background:#354c79}.download-links small{white-space:nowrap;color:#c6d8ff;font:11px/1.2 Consolas,monospace}.site-foot{border-top:1px solid var(--line)}.foot-inner{padding:18px 0 25px;font-size:12px;color:var(--muted);flex-wrap:wrap}.foot-inner i{color:#b1b8c2;font-style:normal}.foot-inner strong{font-weight:650}
.reader{padding-top:28px}.reader-grid{display:grid;grid-template-columns:minmax(135px,17%) minmax(0,1fr) minmax(118px,15%);gap:clamp(24px,3vw,50px);align-items:start}.book-nav,.local-toc{min-width:0}.book-nav-inner,.local-toc>div{position:sticky;top:18px;max-height:calc(100vh - 36px);overflow-y:auto;scrollbar-width:thin;padding-bottom:12px}.book-nav,.local-toc{position:sticky;top:18px}.book-nav-inner{border-right:1px solid var(--line);padding-right:14px}.book-nav .rail-title{display:inline-block;margin:5px 0 14px}.side-group{margin:0 0 17px}.side-group h3{color:#50617b;font-size:12px;line-height:1.5;letter-spacing:.035em;display:flex;gap:6px;align-items:baseline;margin-bottom:6px}.side-group a{display:block;font-size:13px;color:#536074;padding:6px 9px;line-height:1.55;border:1px solid transparent;border-radius:4px}.side-group a:hover{color:var(--blue);text-decoration:underline}.side-group 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