:root{--bg:#0e131a;--bg2:#131a24;--card:#17202d;--card2:#1c2635;--line:#26313f;--line2:#314052;
--txt:#dbe4ef;--mut:#8fa0b3;--dim:#64748b;--acc:#6ea8fe;--acc2:#8b7cf6;--ok:#3fb68b;--warn:#e5b567;--bad:#f07f7f;
--code:#0b1017;--radius:14px;--shadow:0 10px 30px rgba(0,0,0,.35)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--txt);
font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
font-size:15px;line-height:1.75;-webkit-font-smoothing:antialiased}
a{color:var(--acc);text-decoration:none}a:hover{text-decoration:underline}
.topbar{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:14px;padding:10px 18px;
background:rgba(14,19,26,.86);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px;color:var(--txt);white-space:nowrap}
.brand:hover{text-decoration:none}.brand-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:9px;
background:linear-gradient(135deg,var(--acc),var(--acc2));color:#0b1017;font-weight:800;font-size:12px;letter-spacing:.5px}
.brand-text{font-weight:700;font-size:14px}.brand-text em{font-style:normal;color:var(--dim);font-weight:500;font-size:12px;margin-left:6px}
.search{position:relative;flex:1;max-width:520px;margin-left:auto}
.search svg{position:absolute;left:10px;top:50%;transform:translateY(-50%);width:16px;height:16px;color:var(--dim);pointer-events:none}
.search input{width:100%;padding:8px 12px 8px 32px;border-radius:10px;border:1px solid var(--line);background:var(--bg2);
color:var(--txt);font-size:13px;outline:none}
.search input:focus{border-color:var(--acc);box-shadow:0 0 0 3px rgba(110,168,254,.15)}
.results{position:absolute;top:calc(100% + 6px);left:0;right:0;max-height:340px;overflow:auto;background:var(--card);
border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);padding:6px}
.result{display:block;padding:8px 10px;border-radius:8px;color:var(--txt)}
.result:hover{background:var(--card2);text-decoration:none}.result b{display:block;font-size:13px;color:var(--acc)}
.result span{display:block;font-size:12px;color:var(--mut);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.icon-btn{display:grid;place-items:center;width:36px;height:36px;border-radius:10px;border:1px solid var(--line);
background:var(--bg2);color:var(--txt);cursor:pointer;font-size:16px}
.icon-btn:hover{border-color:var(--acc)}#menu{display:none}
.shell{display:grid;grid-template-columns:230px minmax(0,1fr) 220px;gap:26px;max-width:1280px;margin:0 auto;padding:26px 22px 60px}
.sidebar{position:sticky;top:64px;align-self:start;max-height:calc(100vh - 80px);overflow:auto;border-right:1px solid var(--line);padding-right:18px}
.nav-title{margin:16px 0 6px;font-size:11px;letter-spacing:2px;color:var(--dim);text-transform:uppercase}
.nav-item{display:block;padding:5px 9px;border-radius:8px;color:var(--mut);font-size:13px;line-height:1.45}
.nav-item:hover,.nav-item.on{background:var(--card2);color:var(--txt);text-decoration:none}
.nav-item.on{border-left:2px solid var(--acc);padding-left:7px}
.side-foot{margin-top:22px;padding-top:14px;border-top:1px solid var(--line);font-size:12px;color:var(--dim)}
.side-foot p{margin:6px 0}.side-foot a{font-size:12px}
.content{min-width:0}.page-head{margin-bottom:22px}.crumb{font-size:12px;letter-spacing:1.5px;color:var(--acc);text-transform:uppercase}
h1{margin:6px 0 4px;font-size:27px;line-height:1.35}
.lede{margin:0 0 14px;color:var(--mut);font-size:14px}
.page-actions{display:flex;gap:10px;margin-top:14px}
.btn{display:inline-block;padding:7px 14px;border-radius:9px;background:var(--acc);color:#0b1017;font-weight:700;font-size:13px}
.btn:hover{text-decoration:none;filter:brightness(1.08)}
.btn.ghost{background:transparent;color:var(--txt);border:1px solid var(--line2)}
.article{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px 30px;box-shadow:var(--shadow)}
.article h2{margin:30px 0 10px;font-size:20px;padding-left:10px;border-left:3px solid var(--acc)}
.article h3{margin:24px 0 8px;font-size:16.5px;padding-left:8px;border-left:2px solid var(--line2)}
.article h4{margin:20px 0 6px;font-size:15px}
.article p{margin:10px 0}.article ul,.article ol{padding-left:22px;margin:10px 0}.article li{margin:4px 0}
.article strong{color:#fff}.article table{width:100%;border-collapse:collapse;margin:14px 0;font-size:13.5px;display:block;overflow-x:auto}
.article th,.article td{border:1px solid var(--line);padding:8px 11px;text-align:left;vertical-align:top;white-space:normal}
.article th{background:var(--card2);color:var(--txt);font-weight:700}
.article tr:nth-child(even) td{background:rgba(255,255,255,.02)}
.article blockquote{margin:14px 0;padding:10px 16px;border-left:3px solid var(--acc);background:var(--bg2);border-radius:0 10px 10px 0;color:var(--mut);font-size:14px}
.article blockquote p{margin:4px 0}
.article code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.88em;background:var(--code);
padding:2px 6px;border-radius:6px;color:#9ecbff;border:1px solid var(--line)}
.article pre{margin:14px 0;padding:16px 18px;background:var(--code);border:1px solid var(--line);border-radius:12px;overflow:auto}
.article pre code{background:none;border:0;padding:0;color:#c9d6e6;font-size:13px;line-height:1.65}
.codeblock{position:relative;margin:14px 0}.copy-btn{position:absolute;top:8px;right:8px;padding:4px 12px;border-radius:7px;
border:1px solid var(--line2);background:var(--card2);color:var(--mut);font-size:12px;cursor:pointer}
.copy-btn:hover{color:var(--txt);border-color:var(--acc)}
.badge{display:inline-block;padding:1px 8px;border-radius:999px;font-size:11.5px;font-weight:700;vertical-align:middle;margin:0 2px}
.b-measured{background:rgba(63,182,139,.16);color:#5fd3a5;border:1px solid rgba(63,182,139,.4)}
.b-ref{background:rgba(110,168,254,.15);color:#9cc1ff;border:1px solid rgba(110,168,254,.4)}
.b-raw{background:rgba(229,181,103,.14);color:#e8c586;border:1px solid rgba(229,181,103,.4)}
.b-one{background:rgba(139,124,246,.16);color:#b3a7ff;border:1px solid rgba(139,124,246,.45)}
.b-h{background:rgba(224,120,120,.13);color:#f09a9a;border:1px solid rgba(224,120,120,.4)}
.toc-wrap{position:sticky;top:64px;align-self:start;max-height:calc(100vh - 80px);overflow:auto;padding-left:18px;border-left:1px solid var(--line)}
.toc-title{margin:0 0 8px;font-size:11px;letter-spacing:2px;color:var(--dim)}
.toc a{display:block;color:var(--mut);font-size:12.5px;line-height:1.55;padding:2px 0}
.toc a:hover{color:var(--txt);text-decoration:none}.toc .l2{padding-left:0}.toc .l3{padding-left:10px;color:var(--dim);font-size:12px}
.toc-empty{color:var(--dim);font-size:12px}
.page-foot{margin-top:26px;padding:14px 16px;border:1px dashed var(--line2);border-radius:12px;color:var(--dim);font-size:12.5px}
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:var(--card2);border:1px solid var(--line2);
color:var(--txt);padding:8px 18px;border-radius:999px;font-size:13px;box-shadow:var(--shadow)}
@media(max-width:1080px){.shell{grid-template-columns:200px minmax(0,1fr)}.toc-wrap{display:none}}
@media(max-width:820px){
  .shell{grid-template-columns:minmax(0,1fr);padding:18px 14px 50px}
  .sidebar{position:fixed;top:0;left:0;bottom:0;width:260px;z-index:60;background:var(--bg);border-right:1px solid var(--line);
    transform:translateX(-105%);transition:transform .25s;padding:60px 16px 20px}
  .sidebar.open{transform:none;box-shadow:var(--shadow)}
  .sidebar::before{content:"";position:absolute;top:10px;left:10px;font-size:11px;letter-spacing:2px;color:var(--dim)}
  .side-foot{margin-top:24px}
  #menu{display:grid}
  .article{padding:20px 18px}.article h1{font-size:23px}
  .brand-text em{display:none}.search input{padding-right:8px}
}
.article .headerlink{margin-left:7px;font-size:.72em;color:var(--dim);opacity:0;transition:opacity .15s}
.article h2:hover .headerlink,.article h3:hover .headerlink{opacity:.85;text-decoration:none}
html.light{--bg:#f6f8fb;--bg2:#eef1f6;--card:#ffffff;--card2:#f3f6fa;--line:#e3e8ef;--line2:#cbd5e1;
--txt:#1f2937;--mut:#55637a;--dim:#93a1b5;--acc:#2f6fe4;--acc2:#7c5cf0;--ok:#1f9d6f;--warn:#b3771a;--bad:#d9534f;
--code:#f4f7fb;--shadow:0 8px 24px rgba(15,23,42,.08)}
html.light .topbar{background:rgba(246,248,251,.9)}
html.light .article strong{color:#0b1220}
html.light .article code{color:#1d4ed8;background:var(--code)}
html.light .article pre code{color:#243447;background:none}
html.light .article tr:nth-child(even) td{background:rgba(15,23,42,.02)}
html.light .article blockquote{background:#f3f6fa}
html.light .b-measured{color:#0f7a58;background:rgba(31,157,111,.1)}
html.light .b-ref{color:#2f6fe4;background:rgba(47,111,228,.09)}
html.light .b-raw{color:#996a13;background:rgba(179,119,26,.1)}
html.light .b-one{color:#6746d6;background:rgba(124,92,240,.1)}
html.light .b-h{color:#b04a4a;background:rgba(217,83,79,.09)}
/* ---------- 滚动进度条 ---------- */
#progress{position:fixed;top:0;left:0;height:2px;width:0;
  background:linear-gradient(90deg,var(--acc),var(--acc2));z-index:80;will-change:width;pointer-events:none}
/* ---------- 首页 3D 横幅 ---------- */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line);
  background:radial-gradient(1200px 420px at 15% -8%,rgba(110,168,254,.16),transparent 60%),
             radial-gradient(960px 400px at 88% 0%,rgba(139,124,246,.13),transparent 60%);
  background-color:var(--bg)}
#hero3d{position:absolute;inset:0;width:100%;height:100%;display:block}
.hero-glow{position:absolute;inset:0;background:radial-gradient(600px 300px at 50% 40%,rgba(110,168,254,.10),transparent 70%)}
.hero-fallback{display:none;position:absolute;inset:0;background:var(--bg2);color:var(--mut);font-size:14px;
  padding:22% 8% 0;border:1px dashed var(--line);border-radius:0}
.no-webgl .hero-fallback{display:block}
.no-webgl #hero3d{display:none}
.hero-inner{position:relative;max-width:1280px;margin:0 auto;padding:58px 22px 66px;pointer-events:none;z-index:1}
.hero-kicker{color:var(--acc);font-size:12px;letter-spacing:3px;text-transform:uppercase;margin:0 0 16px}
.hero-cta{pointer-events:auto;display:flex;gap:12px;flex-wrap:wrap;margin-top:20px}
.hero-title{font-size:clamp(26px,4.6vw,50px);line-height:1.2;margin:0 0 14px}
.grad{background:linear-gradient(92deg,#6ea8fe,#8b7cf6,#4fd1c5);background-size:200% 100%;
  -webkit-background-clip:text;background-clip:text;color:transparent;animation:shimmer 7s linear infinite}
@keyframes shimmer{to{background-position:200% 0}}
.hero-sub{color:var(--mut);font-size:15px;max-width:560px;margin:0 0 20px}
.btn.big{padding:10px 21px;font-size:14px}
.btn.ghost.big{border-color:var(--line2)}
.hero-hint{color:var(--dim);font-size:12.5px;margin-top:16px;pointer-events:auto}
/* ---------- 滚动揭示 ---------- */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .65s ease,transform .65s cubic-bezier(.2,.7,.2,1);will-change:opacity,transform}
.reveal.in{opacity:1;transform:none}
/* ---------- 回到顶部 ---------- */
#toTop{position:fixed;right:18px;bottom:70px;width:42px;height:42px;border-radius:12px;border:1px solid var(--line);
  background:var(--card2);color:var(--txt);font-size:18px;display:grid;place-items:center;cursor:pointer;
  opacity:0;pointer-events:none;transition:opacity .25s,transform .25s;box-shadow:var(--shadow);z-index:40}
#toTop.show{opacity:1;pointer-events:auto}
#toTop:hover{transform:translateY(-3px)}
/* ---------- 3D 总览页 ---------- */
.viz-tools{display:flex;gap:10px;align-items:center;margin:14px 0 12px;flex-wrap:wrap}
.btn.small{padding:6px 13px;font-size:12.5px}
.viz-hint{color:var(--dim);font-size:12.5px}
.viz-stage{position:relative;height:min(72vh,640px);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;background:radial-gradient(700px 380px at 50% 0%,rgba(110,168,254,.10),transparent 70%)}
#viz3d{width:100%;height:100%;display:block;cursor:grab}
.viz-info{position:absolute;left:14px;bottom:14px;right:14px;padding:10px 14px;border-radius:10px;
  background:rgba(14,19,26,.72);border:1px solid var(--line);font-size:13px;backdrop-filter:blur(8px)}
.viz-legend{margin-top:12px;color:var(--dim);font-size:12.5px;display:flex;gap:8px;align-items:center;flex-wrap:wrap}
html.light .viz-info{background:rgba(255,255,255,.82)}
/* ---------- 减弱动态效果 ---------- */
@media(prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none}
  .grad{animation:none}
  #progress{display:none}
}