:root{
  --paper:#FAF6EC;--paper-2:#F3EBDA;--paper-3:#EDE3CE;
  --ink:#211D17;--ink-soft:#4B453B;--muted:#938977;
  --gold:#A9762A;--gold-2:#C9972F;--gold-wash:#F4E7CE;
  --sage:#37665A;--sage-2:#4E8576;--sage-wash:#DDE9E2;
  --line:rgba(33,29,23,.14);--line-soft:rgba(33,29,23,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);
  font-family:"Noto Serif SC","Fraunces",serif;line-height:1.85;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:var(--gold);text-decoration:none}
a:hover{text-decoration:underline}
.sans{font-family:"Noto Sans SC",sans-serif}
.serif-d{font-family:"Fraunces","Noto Serif SC",serif}

/* 顶栏 */
nav.top{position:sticky;top:0;z-index:50;backdrop-filter:blur(10px);
  background:rgba(250,246,236,.82);border-bottom:1px solid var(--line-soft)}
nav.top .bar{max-width:1240px;margin:0 auto;padding:0 24px;height:60px;
  display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:700}
.brand .mk{width:24px;height:24px}
.navlinks{display:flex;gap:22px;font-family:"Noto Sans SC";font-size:14px}
.navlinks a{color:var(--ink-soft)}
.navlinks a:hover{color:var(--gold);text-decoration:none}

/* 布局 */
.shell{max-width:1240px;margin:0 auto;padding:0 24px;display:grid;
  grid-template-columns:272px 1fr;gap:40px;align-items:start}
.side{position:sticky;top:78px;max-height:calc(100vh - 96px);overflow:auto;
  padding:26px 0 40px}
.side h4{font-family:"Noto Sans SC";font-size:12px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--muted);margin:0 0 12px}
.side .catname{display:flex;align-items:center;gap:9px;font-weight:700;font-size:16px;margin-bottom:14px}
.side .catname i{color:var(--gold)}
.side ul{list-style:none;margin:0;padding:0}
.side li a{display:block;font-family:"Noto Sans SC";font-size:13.5px;color:var(--ink-soft);
  padding:7px 12px;border-radius:8px;line-height:1.4;border-left:2px solid transparent}
.side li a:hover{background:var(--paper-2);text-decoration:none}
.side li a.cur{background:var(--gold-wash);color:var(--gold);border-left-color:var(--gold);font-weight:600}
.side .back{font-family:"Noto Sans SC";font-size:13px;margin-bottom:20px;display:inline-block}

/* 正文 */
main{min-width:0;padding:40px 0 90px}
.crumb{font-family:"Noto Sans SC";font-size:12.5px;color:var(--muted);margin-bottom:18px}
.crumb a{color:var(--muted)}
.doc{background:#fff;border:1px solid var(--line);border-radius:18px;padding:46px 52px;
  box-shadow:0 30px 60px -50px rgba(33,29,23,.5)}
.md-body{font-size:16px}
.md-body h1{font-size:32px;font-weight:900;letter-spacing:-.01em;line-height:1.25;
  margin:0 0 24px;padding-bottom:18px;border-bottom:2px solid var(--line)}
.md-body h2{font-size:21px;font-weight:700;margin:36px 0 12px;padding-top:18px;
  border-top:1px solid var(--line-soft);scroll-margin-top:78px}
.md-body h2:first-of-type{border-top:0;padding-top:0}
.md-body h3{font-size:17px;font-weight:700;margin:26px 0 10px;color:var(--gold)}
.md-body h4{font-size:15px;font-weight:700;margin:20px 0 8px;color:var(--ink-soft)}
.md-body p{margin:12px 0;color:var(--ink-soft)}
.md-body strong{color:var(--ink);font-weight:700}
.md-body ul,.md-body ol{margin:12px 0;padding-left:22px}
.md-body li{margin:5px 0;color:var(--ink-soft)}
.md-body li::marker{color:var(--gold)}
.md-body blockquote{margin:18px 0;padding:14px 20px;background:var(--gold-wash);
  border-left:4px solid var(--gold);border-radius:0 10px 10px 0;
  font-family:"Noto Serif SC";font-weight:500;color:var(--ink)}
.md-body blockquote p{color:var(--ink);margin:4px 0}
.md-body code{font-family:ui-monospace,Menlo,monospace;font-size:.88em;
  background:var(--paper-2);padding:2px 6px;border-radius:5px;color:#8a5a14}
.md-body pre{background:#211D17;color:#f0e9da;padding:18px 20px;border-radius:12px;
  overflow:auto;margin:16px 0;line-height:1.6}
.md-body pre code{background:none;color:inherit;padding:0;font-size:13px}
.md-body hr{border:0;border-top:1px solid var(--line);margin:30px 0}
.md-body table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14px;
  font-family:"Noto Sans SC"}
.md-body th{background:var(--ink);color:var(--paper);font-weight:600;text-align:left;
  padding:10px 14px}
.md-body td{padding:10px 14px;border-bottom:1px solid var(--line);color:var(--ink-soft);vertical-align:top}
.md-body tr:nth-child(even) td{background:var(--paper-2)}
.md-body a{color:var(--gold);font-weight:500}

/* 中枢 hub */
.hub-hero{max-width:1240px;margin:0 auto;padding:64px 24px 30px}
.kicker{font-family:"Noto Sans SC";font-size:12.5px;font-weight:700;letter-spacing:.3em;
  text-transform:uppercase;color:var(--gold)}
.hub-hero h1{font-size:clamp(34px,5vw,56px);font-weight:900;letter-spacing:-.01em;margin:14px 0 14px}
.hub-hero p{font-size:17px;color:var(--ink-soft);max-width:50em;margin:0}
.hub{max-width:1240px;margin:0 auto;padding:20px 24px 90px}
.catblock{margin-bottom:46px}
.catblock .ch{display:flex;align-items:center;gap:12px;margin-bottom:18px}
.catblock .ch i{width:40px;height:40px;border-radius:11px;display:grid;place-items:center;
  font-size:17px;background:var(--gold-wash);color:var(--gold)}
.catblock.sage .ch i{background:var(--sage-wash);color:var(--sage)}
.catblock.neutral .ch i{background:var(--paper-3);color:var(--ink)}
.catblock .ch h2{font-size:23px;font-weight:800;margin:0}
.catblock .ch .cnt{font-family:"Noto Sans SC";font-size:13px;color:var(--muted)}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.docard{display:block;background:#fff;border:1px solid var(--line);border-radius:14px;
  padding:20px 22px;color:var(--ink);transition:transform .3s,box-shadow .3s,border-color .3s}
.docard:hover{transform:translateY(-4px);box-shadow:0 20px 40px -30px rgba(33,29,23,.5);
  border-color:rgba(33,29,23,.25);text-decoration:none}
.docard .t{font-weight:700;font-size:16px;line-height:1.4;margin-bottom:8px}
.docard .m{font-family:"Noto Sans SC";font-size:12.5px;color:var(--muted)}
.docard .m i{color:var(--gold);margin-right:5px}

footer{background:var(--ink);color:rgba(250,246,236,.6);padding:40px 0;
  font-family:"Noto Sans SC";font-size:13px;text-align:center}
footer a{color:var(--gold-2)}

@media(max-width:900px){
  .shell{grid-template-columns:1fr}
  .side{position:static;max-height:none;border-bottom:1px solid var(--line);padding-bottom:18px}
  .grid{grid-template-columns:1fr}
  .doc{padding:30px 22px}
  .navlinks{gap:16px}
}