:root{
  --bg:#0b1220;
  --panel:rgba(255,255,255,.06);
  --panel2:rgba(255,255,255,.09);
  --text:rgba(255,255,255,.92);
  --muted:rgba(255,255,255,.68);
  --line:rgba(148,163,184,.22);
  --accent:#3b82f6;
  --shadow:0 18px 60px rgba(0,0,0,.35);
  --radius:18px;
  --max:1180px;
  --mono:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans:ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Arial;
}
@media (prefers-color-scheme: light){
  :root{
    --bg:#f6f8fb;
    --panel:rgba(15,23,42,.06);
    --panel2:rgba(15,23,42,.08);
    --text:rgba(15,23,42,.92);
    --muted:rgba(15,23,42,.62);
    --line:rgba(148,163,184,.35);
    --shadow:0 18px 55px rgba(15,23,42,.10);
  }
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:var(--sans);
  background: radial-gradient(1200px 600px at 15% 10%, rgba(59,130,246,.22), transparent 60%),
              radial-gradient(900px 520px at 85% 20%, rgba(34,197,94,.14), transparent 60%),
              radial-gradient(900px 520px at 60% 90%, rgba(96,165,250,.10), transparent 55%),
              var(--bg);
  color:var(--text);
}
a{color:inherit}
.wrap{max-width:var(--max); margin:0 auto; padding:22px 16px 40px;}
.topbar{
  display:flex; align-items:center; justify-content:space-between; gap:14px;
  padding:12px 14px; border:1px solid var(--line); border-radius:var(--radius);
  background:linear-gradient(180deg, var(--panel2), var(--panel)); box-shadow:var(--shadow);
}
.brand{display:flex; align-items:center; gap:12px; min-width:240px}
.logo{
  width:34px; height:34px; border-radius:12px;
  background:linear-gradient(135deg, rgba(59,130,246,.95), rgba(96,165,250,.85));
  display:flex; align-items:center; justify-content:center;
  font-weight:900; letter-spacing:.5px; color:#fff; user-select:none;
}
.brand h1{margin:0; font-size:14px; line-height:1.1}
.brand .sub{display:block; font-size:12px; color:var(--muted); margin-top:2px}
.nav{display:flex; gap:10px; flex-wrap:wrap; justify-content:flex-end}
.nav a{
  text-decoration:none; font-size:13px; padding:8px 10px; border-radius:12px;
  border:1px solid transparent; color:var(--muted);
}
.nav a:hover{border-color:var(--line); color:var(--text); background:rgba(255,255,255,.04)}

.hero{
  margin-top:14px; padding:18px 16px; border-radius:var(--radius); border:1px solid var(--line);
  background:linear-gradient(180deg, var(--panel2), var(--panel)); box-shadow:var(--shadow);
}
.hero h2{margin:0 0 8px; font-size:22px; letter-spacing:-0.02em}
.hero p{margin:0; color:var(--muted); line-height:1.5; max-width:75ch}

.grid{margin-top:14px; display:grid; grid-template-columns: 300px 1fr; gap:14px}
@media (max-width: 980px){ .grid{grid-template-columns: 1fr} }

.card{
  border:1px solid var(--line); border-radius:var(--radius);
  background:linear-gradient(180deg, var(--panel2), var(--panel));
  box-shadow:var(--shadow); padding:14px;
}

.sidebar{position:sticky; top:14px; height:fit-content}
.toc-title{margin:0 0 8px; font-size:14px}
.toc{list-style:none; padding:0; margin:0}
.toc li{margin:6px 0}
.toc a{
  display:block; text-decoration:none; font-size:13px; color:var(--muted);
  padding:8px 10px; border-radius:12px; border:1px solid transparent;
}
.toc a:hover{border-color:var(--line); color:var(--text); background:rgba(255,255,255,.04)}
.toc a.active{border-color:rgba(59,130,246,.55); color:var(--text); background:linear-gradient(180deg, rgba(59,130,246,.18), rgba(59,130,246,.06));}

.content h3{margin:0 0 8px; font-size:18px}
.content h4{margin:18px 0 8px; font-size:15px}
.content p{margin:0 0 12px; color:var(--muted); line-height:1.55}
.content ul{margin:0 0 12px; color:var(--muted); line-height:1.55; padding-left:18px}
hr{border:0; border-top:1px solid var(--line); margin:16px 0}

.figure{margin:14px 0; border:1px solid var(--line); border-radius:16px; overflow:hidden; background:rgba(255,255,255,.03)}
.figure img{display:block; width:100%; height:auto}
.figcap{padding:10px 12px; font-size:12px; color:var(--muted)}
.kbd{font-family:var(--mono); font-size:12px; padding:2px 6px; border:1px solid var(--line); border-radius:10px; background:rgba(255,255,255,.03); color:var(--text)}
.note{border-left:3px solid rgba(59,130,246,.7); padding:10px 12px; border-radius:12px; background:rgba(59,130,246,.08); color:var(--muted); margin:12px 0}
.warn{border-left:3px solid rgba(245,158,11,.85); padding:10px 12px; border-radius:12px; background:rgba(245,158,11,.10); color:var(--muted); margin:12px 0}
.pager{display:flex; justify-content:space-between; gap:10px; margin-top:18px}
.pager a{flex:1; text-decoration:none; border:1px solid var(--line); border-radius:14px; padding:10px 12px; color:var(--muted); background:rgba(255,255,255,.03)}
.pager a:hover{color:var(--text); border-color:rgba(59,130,246,.45)}
.pager b{color:var(--text)}
.footer{margin-top:18px; color:var(--muted); font-size:12px; text-align:center; padding:16px 8px}
.lang{display:grid; grid-template-columns: 1fr; gap:10px}
.lang details{border:1px solid var(--line); border-radius:14px; padding:10px 12px; background:rgba(255,255,255,.03)}
.lang summary{cursor:pointer; font-weight:650; color:var(--text)}