:root{
  --bg:#0a0e17; --bg2:#0e1420; --panel:#121a29; --panel2:#0f1622;
  --border:#1f2a3d; --border2:#2c3a52;
  --text:#e6ecf5; --muted:#93a4bf; --dim:#6b7d99;
  --brand:#38bdf8; --brand2:#818cf8; --accent:#22d3ee;
  --green:#22c55e; --yellow:#facc15; --red:#ef4444;
  --code-bg:#0b111c;
  --sans:'Segoe UI',system-ui,-apple-system,Arial,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,Consolas,monospace;
}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--text);font-family:var(--sans);-webkit-font-smoothing:antialiased;line-height:1.6}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}

/* ---------- Sidebar ---------- */
.sb{position:fixed;left:0;top:0;bottom:0;width:290px;background:linear-gradient(180deg,#0b1120,#080d16);
  border-right:1px solid var(--border);display:flex;flex-direction:column;z-index:20}
.sb-top{padding:20px 20px 12px}
.logo{display:flex;align-items:center;gap:11px}
.logo .mk{width:38px;height:38px;border-radius:11px;display:grid;place-items:center;font-size:20px;
  background:linear-gradient(135deg,#38bdf8,#818cf8);box-shadow:0 0 20px rgba(56,189,248,.4)}
.logo b{font-size:17px;letter-spacing:.5px;background:linear-gradient(90deg,#7dd3fc,#a5b4fc);-webkit-background-clip:text;background-clip:text;color:transparent}
.logo .sub{font-size:10.5px;color:var(--muted);letter-spacing:1.5px;text-transform:uppercase}
.search{margin:16px 20px 8px;position:relative}
.search input{width:100%;padding:10px 12px 10px 34px;border-radius:10px;border:1px solid var(--border2);
  background:#080d16;color:var(--text);font-size:13.5px;outline:none}
.search input:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(56,189,248,.12)}
.search .ic{position:absolute;left:11px;top:9px;color:var(--dim);font-size:14px}
.nav{flex:1;overflow:auto;padding:6px 12px 20px}
.nav::-webkit-scrollbar{width:8px}.nav::-webkit-scrollbar-thumb{background:#1c2740;border-radius:8px}
.cat{margin:12px 8px 4px;font-size:10.5px;text-transform:uppercase;letter-spacing:1px;color:var(--dim);font-weight:700}
.catgrp{margin:2px 0}
.catgrp>summary{list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;
  gap:8px;padding:9px 11px;border-radius:9px;font-size:12.5px;font-weight:700;color:#cdd8ea;user-select:none}
.catgrp>summary::-webkit-details-marker{display:none}
.catgrp>summary:hover{background:#111b2b}
.catgrp>summary::before{content:"▸";color:var(--dim);font-size:11px;transition:transform .15s;margin-right:2px}
.catgrp[open]>summary::before{transform:rotate(90deg)}
.catgrp>summary span:first-of-type{flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.catgrp .cc{font-size:10px;color:var(--dim);background:#101a29;border:1px solid var(--border);padding:1px 7px;border-radius:999px;font-weight:600}
.catgrp[open]>summary{color:#fff}
.nav a{display:block;color:#b6c6de;padding:6px 11px 6px 24px;border-radius:8px;font-size:12.5px;margin:1px 0;
  text-decoration:none;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;border:1px solid transparent}
.nav a:hover{background:#131e30;color:#fff}
.nav a.active{background:linear-gradient(90deg,rgba(56,189,248,.16),rgba(129,140,248,.08));color:#fff;border-color:rgba(56,189,248,.3)}
.sb-foot{padding:12px 16px;border-top:1px solid var(--border);display:flex;gap:8px}
.sb-foot a{flex:1;text-align:center;font-size:12.5px;padding:9px;border-radius:9px;background:#131e30;color:#cdd8ea;border:1px solid var(--border2)}
.sb-foot a:hover{border-color:var(--brand);text-decoration:none}

/* ---------- Main ---------- */
.main{margin-left:290px;min-height:100vh}
.content{max-width:860px;margin:0 auto;padding:36px 40px 90px}
.crumb{color:var(--dim);font-size:12.5px;margin-bottom:16px}
.crumb a{color:var(--muted)}

/* ---------- Home ---------- */
.hero{padding:26px 30px;border:1px solid var(--border);border-radius:18px;
  background:linear-gradient(135deg,rgba(56,189,248,.08),rgba(129,140,248,.06)),var(--panel);margin-bottom:26px}
.hero h1{margin:0 0 8px;font-size:26px}
.hero p{margin:0;color:var(--muted);font-size:14px}
.statrow{display:flex;gap:22px;margin-top:18px;flex-wrap:wrap}
.statrow .s{display:flex;flex-direction:column}
.statrow .s b{font-size:22px;color:#fff}.statrow .s span{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.5px}
.catgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px}
.catcard{border:1px solid var(--border);border-radius:14px;padding:16px 18px;background:var(--panel);transition:.15s}
.catcard:hover{border-color:var(--border2);transform:translateY(-2px)}
.catcard h3{margin:0 0 10px;font-size:14px;color:#dce6f4;display:flex;align-items:center;gap:8px}
.catcard .cnt{font-size:11px;color:var(--muted);font-weight:600}
.catcard a{display:block;font-size:13px;padding:4px 0;color:#b6c6de;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.catcard a:hover{color:var(--brand);text-decoration:none}
.empty-kb{text-align:center;padding:50px 20px;color:var(--muted)}
.empty-kb .big{font-size:42px;margin-bottom:14px}
.btn{display:inline-block;background:linear-gradient(180deg,#0ea5e9,#0284c7);color:#fff;padding:10px 18px;border-radius:10px;font-weight:700;font-size:13.5px;border:0;cursor:pointer}
.btn:hover{filter:brightness(1.12);text-decoration:none}

/* ---------- Markdown content ---------- */
.doc{font-size:15px}
.doc h1{font-size:28px;margin:0 0 18px;padding-bottom:12px;border-bottom:1px solid var(--border);line-height:1.25}
.doc h2{font-size:21px;margin:32px 0 12px;color:#dce6f4}
.doc h3{font-size:17px;margin:24px 0 10px;color:#cfdbec}
.doc h4{font-size:15px;margin:20px 0 8px;color:var(--muted)}
.doc p{margin:0 0 14px}
.doc ul,.doc ol{margin:0 0 14px;padding-left:24px}.doc li{margin:5px 0}
.doc a{color:var(--brand)}
.doc code{font-family:var(--mono);font-size:.88em;background:var(--code-bg);border:1px solid var(--border);padding:1px 6px;border-radius:5px;color:#a5d8ff}
.doc pre{background:var(--code-bg);border:1px solid var(--border);border-radius:12px;padding:16px;overflow:auto;margin:0 0 16px}
.doc pre code{background:0;border:0;padding:0;color:#c7d6ea;font-size:13px;line-height:1.55}
.doc blockquote{margin:0 0 16px;padding:10px 18px;border-left:3px solid var(--brand);background:rgba(56,189,248,.06);border-radius:0 10px 10px 0;color:#c7d6ea}
.doc table{width:100%;border-collapse:collapse;margin:0 0 18px;font-size:13.5px;display:block;overflow-x:auto}
.doc th,.doc td{border:1px solid var(--border);padding:9px 12px;text-align:left}
.doc th{background:#132033;color:#bfdbfe}
.doc img{max-width:100%;border-radius:10px}
.doc hr{border:0;border-top:1px solid var(--border);margin:24px 0}
.metaline{color:var(--dim);font-size:12px;margin-bottom:22px}

/* ---------- Search dropdown ---------- */
.results{position:absolute;left:20px;right:20px;top:44px;background:#0d1524;border:1px solid var(--border2);
  border-radius:12px;box-shadow:0 24px 50px -12px #000;max-height:60vh;overflow:auto;z-index:30;display:none}
.results.on{display:block}
.results a{display:block;padding:11px 14px;border-bottom:1px solid var(--border);text-decoration:none}
.results a:hover{background:#131e30}
.results .rt{font-size:13.5px;color:#e6eefb;font-weight:600}
.results .rc{font-size:10.5px;color:var(--brand);text-transform:uppercase;letter-spacing:.5px}
.results .rs{font-size:12px;color:var(--muted);margin-top:3px}
.results .none{padding:16px;color:var(--muted);font-size:13px}

/* ---------- AI Ask panel ---------- */
.ai-fab{position:fixed;right:26px;bottom:26px;z-index:40;background:linear-gradient(135deg,#38bdf8,#6366f1);
  color:#fff;border:0;border-radius:999px;padding:14px 20px;font-size:14px;font-weight:700;cursor:pointer;
  box-shadow:0 14px 34px -10px rgba(56,189,248,.6);display:flex;align-items:center;gap:9px}
.ai-fab:hover{filter:brightness(1.1)}
.ai-panel{position:fixed;right:0;top:0;bottom:0;width:min(440px,94vw);background:#0b1220;border-left:1px solid var(--border2);
  z-index:41;transform:translateX(100%);transition:transform .28s ease;display:flex;flex-direction:column;box-shadow:-20px 0 60px -20px #000}
.ai-panel.on{transform:translateX(0)}
.ai-h{display:flex;align-items:center;justify-content:space-between;padding:16px 18px;border-bottom:1px solid var(--border)}
.ai-h b{font-size:15px;display:flex;align-items:center;gap:9px}
.ai-h .badge{font-size:10px;font-weight:700;padding:2px 8px;border-radius:999px;background:rgba(34,197,94,.15);color:#86efac;margin-left:8px}
.ai-x{cursor:pointer;color:var(--muted);font-size:20px}
.ai-body{flex:1;overflow:auto;padding:16px 18px}
.ai-body::-webkit-scrollbar{width:8px}.ai-body::-webkit-scrollbar-thumb{background:#1c2740;border-radius:8px}
.msg{margin-bottom:14px}
.msg.u{text-align:right}
.msg.u .b{display:inline-block;background:linear-gradient(135deg,#2563eb,#1d4ed8);color:#fff;padding:9px 13px;border-radius:12px 12px 4px 12px;font-size:13.5px;max-width:85%}
.msg.a .b{background:#131e30;border:1px solid var(--border);padding:12px 14px;border-radius:12px 12px 12px 4px;font-size:13.5px;white-space:pre-wrap;line-height:1.6}
.msg.a .src{margin-top:9px;display:flex;flex-wrap:wrap;gap:6px}
.msg.a .src a{font-size:11px;padding:3px 9px;border-radius:999px;background:rgba(56,189,248,.1);border:1px solid rgba(56,189,248,.25);color:#7dd3fc;text-decoration:none}
.thinking{color:var(--accent);font-size:13px;display:flex;align-items:center;gap:8px}
.thinking .d span{display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--accent);margin:0 2px;animation:b 1.2s infinite}
.thinking .d span:nth-child(2){animation-delay:.15s}.thinking .d span:nth-child(3){animation-delay:.3s}
@keyframes b{0%,80%,100%{transform:translateY(0);opacity:.5}40%{transform:translateY(-5px);opacity:1}}
.ai-foot{padding:14px 16px;border-top:1px solid var(--border);display:flex;gap:8px}
.ai-foot input{flex:1;padding:11px 13px;border-radius:10px;border:1px solid var(--border2);background:#080d16;color:var(--text);font-size:13.5px;outline:none}
.ai-foot input:focus{border-color:var(--brand)}
.ai-foot button{background:linear-gradient(135deg,#38bdf8,#6366f1);color:#fff;border:0;border-radius:10px;padding:0 16px;font-weight:700;cursor:pointer}
.ai-hint{font-size:12px;color:var(--muted);margin-bottom:14px}
.ai-hint b{color:#cdd8ea}
.chip-q{display:inline-block;font-size:12px;padding:6px 11px;margin:3px 4px 3px 0;border-radius:999px;background:#131e30;border:1px solid var(--border2);color:#c3d0e4;cursor:pointer}
.chip-q:hover{border-color:var(--brand)}

@media(max-width:820px){.sb{transform:translateX(-100%)}.main{margin-left:0}.content{padding:24px 18px 90px}}