:root{
  --bg:#0b0f17; --panel:#121826; --panel-2:#0f1420; --text:#e7ecf3; --muted:#9aa7b8;
  --line:#1f2937; --accent:#4cc2ff; --accent-2:#7ee787; --warn:#ffb86b; --code:#0a0e15;
  --radius:8px; --max:1120px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);
  font:16px/1.75 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  overflow-x:hidden}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-9999px}
.site-header{position:sticky;top:0;z-index:20;background:rgba(11,15,23,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;gap:20px;height:60px;flex-wrap:wrap}
.brand{font-weight:700;color:var(--text);letter-spacing:0}
.nav{display:flex;gap:16px;flex:1;flex-wrap:wrap}
.nav a{color:var(--muted)}
.nav a:hover{color:var(--text)}
.lang a{color:var(--muted);margin-left:6px;font-size:13px}
.lang a.active{color:var(--accent);font-weight:700}
.page{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:40px;padding:32px 20px 56px}
.content{min-width:0}
.content h1{font-size:32px;line-height:1.3;margin:.2em 0 .4em}
.content h2{font-size:23px;margin:2em 0 .6em;padding-top:8px;border-top:1px solid var(--line)}
.content h3{font-size:18px;margin:1.6em 0 .5em}
.content p{margin:.8em 0}
.content ul,.content ol{padding-left:1.3em}
.content li{margin:.35em 0}
.content img{max-width:100%;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
.content blockquote{margin:1em 0;padding:.6em 1em;border-left:3px solid var(--accent);background:var(--panel-2);color:var(--muted)}
.content code{background:var(--code);border:1px solid var(--line);border-radius:4px;padding:.1em .35em;font-size:13.5px;
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;overflow-wrap:anywhere}
.content pre{background:var(--code);border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;overflow:auto}
.content pre code{background:none;border:none;padding:0;font-size:13px;line-height:1.6}
.content table{width:100%;border-collapse:collapse;margin:1em 0;font-size:14.5px}
.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:1em 0}
.table-wrap table{margin:0;min-width:420px}
.content th,.content td{border:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top}
.content th{background:var(--panel)}
.toc{position:sticky;top:80px;align-self:start;font-size:14px;border-left:1px solid var(--line);padding-left:16px;max-height:80vh;overflow:auto}
.toc-title{color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:.08em;margin-bottom:8px}
.toc ul{list-style:none;margin:0;padding:0}
.toc li{margin:5px 0}
.toc .lvl-3{padding-left:12px}
.toc a{color:var(--muted)}
.toc a:hover{color:var(--text)}
.hero{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);gap:28px;align-items:start;padding:8px 0 4px}
.hero h1{font-size:34px;margin:0 0 10px}
.hero .lead{color:var(--muted);font-size:17px}
.hero-media img{width:100%;border-radius:var(--radius);border:1px solid var(--line);background:#fff}
.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:20px 0 8px}
.stat{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:12px 14px}
.stat b{display:block;font-size:20px}
.stat span{color:var(--muted);font-size:12.5px}
.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin:18px 0}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:16px}
.card h3{margin:.1em 0 .4em;font-size:17px}
.card p{margin:0;color:var(--muted);font-size:14.5px}
.ad{margin:26px 0;min-height:90px;border:1px dashed var(--line);border-radius:var(--radius);
  display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:13px;background:var(--panel-2)}
.product-card{display:grid;grid-template-columns:minmax(0,1fr) 220px;gap:24px;border:1px solid var(--line);
  border-radius:var(--radius);padding:20px;background:linear-gradient(180deg,var(--panel),var(--panel-2));margin:18px 0}
.badge{display:inline-block;font-size:12px;color:var(--accent-2);border:1px solid var(--line);border-radius:999px;padding:2px 10px;margin-bottom:6px}
.price{font-size:26px;font-weight:700;margin-bottom:10px}
.btn{display:block;text-align:center;background:var(--accent);color:#04121c;font-weight:700;
  padding:10px 14px;border-radius:var(--radius)}
.btn:hover{text-decoration:none;filter:brightness(1.05)}
.ticks{margin:8px 0 0;padding-left:1.1em;color:var(--muted)}
.muted{color:var(--muted)}
.small{font-size:13px}
.post-list{list-style:none;padding:0;margin:18px 0}
.post-list li{border-bottom:1px solid var(--line);padding:14px 0}
.post-list a{font-weight:600;font-size:17px}
.post-list p{margin:.3em 0 0;color:var(--muted);font-size:14.5px}
.site-footer{border-top:1px solid var(--line);background:var(--panel-2);padding:28px 0;margin-top:20px}
.demo-card{border:1px solid var(--line);border-radius:var(--radius);background:var(--panel-2);padding:14px;margin:16px 0}
.demo-card canvas{display:block;width:100%;height:auto;background:#0b0f17;border-radius:6px}
.demo-controls{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:10px;font-size:14px;color:var(--muted)}
.demo-controls button{background:var(--accent);color:#04121c;border:0;border-radius:6px;padding:7px 14px;font-weight:700;cursor:pointer}
.demo-controls select{background:var(--panel);color:var(--text);border:1px solid var(--line);border-radius:6px;padding:6px 8px}
.demo-views{display:inline-flex;margin:0 0 10px;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.demo-views button{background:transparent;color:var(--muted);border:0;padding:7px 14px;font-weight:600;cursor:pointer;font-size:13.5px}
.demo-views button+button{border-left:1px solid var(--line)}
.demo-views button.active{background:var(--accent);color:#04121c}
.demo-legend{display:flex;justify-content:space-between;font-size:12.5px;color:var(--muted);margin-top:6px}
.cite a{color:var(--accent);font-size:11.5px;padding:0 1px;text-decoration:none}
.refs{margin-top:34px;border-top:1px solid var(--line);padding-top:12px}
.refs ol{padding-left:1.4em}
.refs li{margin:10px 0;font-size:14px;line-height:1.65}
.grade{display:inline-block;font-size:11.5px;border-radius:4px;padding:1px 7px;margin-right:6px;
  border:1px solid var(--line);color:var(--muted);white-space:nowrap}
.grade-A{color:#7ee787;border-color:#2b4d33}
.grade-B{color:#4cc2ff;border-color:#204a63}
.grade-C{color:#ffb86b;border-color:#5a4526}
.grade-D{color:#c9a2ff;border-color:#4a3a63}
.grade-E{color:#ffd479;border-color:#5c4a1f}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:24px}
.foot-grid a{display:block;color:var(--muted);margin:5px 0;font-size:14.5px}
.foot-title{color:var(--text);font-weight:600;margin-bottom:6px;font-size:14px}
@media (max-width:960px){
  .page{grid-template-columns:minmax(0,1fr)}
  .toc{display:none}
  .hero{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,minmax(0,1fr))}
  .cards{grid-template-columns:1fr}
  .product-card{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr}
}
@media (max-width:640px){
  .site-header .wrap{height:auto;flex-wrap:wrap;gap:10px;padding:10px 14px}
  .nav{gap:12px;font-size:14px;flex-wrap:wrap;order:3;width:100%}
  .lang{order:2}
  .page{padding:20px 14px 40px;gap:20px}
  .content h1{font-size:26px;line-height:1.35}
  .content h2{font-size:20px}
  .hero h1{font-size:27px}
  .stats{grid-template-columns:1fr 1fr}
  .product-card{padding:16px}
  .wrap{padding:0 14px}
}