:root{
  --bg:#0b1220;
  --panel:#0f172a;
  --card:#111c33;
  --text:#e7eefc;
  --muted:rgba(231,238,252,.75);
  --border:rgba(231,238,252,.12);
  --brand:#38bdf8;
  --brand2:#7dd3fc;
  --radius:18px;
  --max:1180px;
  --shadow:0 10px 30px rgba(0,0,0,.28);
  --focus:2px solid rgba(56,189,248,.9);
}
[data-theme="light"]{
  --bg:#ffffff;
  --panel:#f6f7fb;
  --card:#ffffff;
  --text:#0f172a;
  --muted:rgba(15,23,42,.72);
  --border:rgba(15,23,42,.14);
  --brand:#0284c7;
  --brand2:#0ea5e9;
  --shadow:0 10px 30px rgba(15,23,42,.10);
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background:
    radial-gradient(1100px 560px at 12% 10%, rgba(56,189,248,.18), transparent 55%),
    radial-gradient(900px 520px at 88% 24%, rgba(125,211,252,.14), transparent 52%),
    var(--bg);
  color:var(--text);
  line-height:1.65;
}
a{color:inherit}
a:focus-visible, button:focus-visible{outline:var(--focus); outline-offset:3px}
img{max-width:100%; height:auto; display:block}
.container{max-width:var(--max); margin:0 auto; padding:0 20px}
.skip-link{position:absolute; left:-999px; top:10px; padding:10px 12px; border-radius:12px; background:var(--card); border:1px solid var(--border)}
.skip-link:focus{left:12px; z-index:999}

.header{
  position:sticky; top:0; z-index:50;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom:1px solid var(--border);
}
.header__inner{display:flex; align-items:center; justify-content:space-between; padding:14px 0; gap:14px}
.brand{display:flex; align-items:center; gap:10px; text-decoration:none}
.brand__mark{
  width:14px; height:14px; border-radius:6px;
  background:linear-gradient(135deg, var(--brand), var(--brand2));
  box-shadow:0 0 0 6px color-mix(in srgb, var(--brand2) 16%, transparent);
}
.brand__text{font-weight:800; letter-spacing:-0.02em}
.nav{display:flex; gap:10px; align-items:center; flex-wrap:wrap}
.nav a{opacity:.86; text-decoration:none; padding:8px 10px; border-radius:12px}
.nav a:hover{opacity:1; background:rgba(255,255,255,.06)}
.mode-toggle{
  border:1px solid var(--border);
  background:var(--card);
  padding:8px 10px;
  border-radius:12px;
  cursor:pointer;
}
.hero{padding:38px 0 18px}
.hero__grid{display:grid; grid-template-columns:1.15fr .85fr; gap:18px; align-items:start}
.badge{
  display:inline-block; font-size:13px; color:var(--muted);
  padding:6px 10px; border:1px solid var(--border);
  background:rgba(255,255,255,.05);
  border-radius:999px;
}
h1{
  margin:12px 0 10px;
  font-size:40px;
  line-height:1.15;
  letter-spacing:-0.03em;
}
.lead{margin:0; color:var(--muted); font-size:16px}
.card{
  border:1px solid var(--border);
  background: color-mix(in srgb, var(--card) 92%, transparent);
  border-radius:var(--radius);
  padding:16px;
  box-shadow:none;
}
.card h2, .card h3{margin-top:0}
.kv{display:grid; gap:10px; margin-top:14px}
.kv__row{display:flex; gap:10px; align-items:flex-start}
.kv__k{min-width:110px; color:var(--muted); font-size:13px}
.kv__v{color:var(--text); font-size:14px}
.small{font-size:13px; color:var(--muted)}
.main{padding:18px 0 60px}
.layout{display:grid; grid-template-columns: 320px 1fr; gap:18px; align-items:start}
.aside{position:sticky; top:92px}
.toc{max-height: calc(100vh - 130px); overflow:auto; padding-right:4px}
.toc a{display:block; padding:8px 10px; border-radius:12px; text-decoration:none; color:var(--muted)}
.toc a:hover{background:rgba(255,255,255,.06); color:var(--text)}
.toc .toc__title{font-weight:700; color:var(--text); margin:0 0 10px}
.content{
  border:1px solid var(--border);
  background: color-mix(in srgb, var(--card) 92%, transparent);
  border-radius:var(--radius);
  padding:18px;
}
.content h1{font-size:30px}
.content h2{margin-top:28px; font-size:20px; letter-spacing:-0.01em}
.content p{margin: 10px 0}
.center{text-align:center}
.content hr{border:none; border-top:1px solid var(--border); margin:18px 0}
.content ul{padding-left:18px; color:var(--muted)}
.content a{color: color-mix(in srgb, var(--brand2) 90%, white)}
.content a:hover{text-decoration:underline}
.figure{margin:16px 0; border:1px solid var(--border); border-radius:16px; overflow:hidden; background:rgba(255,255,255,.03)}
.figure img{width:100%}
.footer{border-top:1px solid var(--border); padding:22px 0; color:var(--muted)}
.footer__inner{display:flex; justify-content:space-between; gap:12px; align-items:center; flex-wrap:wrap}
@media (max-width: 980px){
  .hero__grid{grid-template-columns:1fr}
  .layout{grid-template-columns:1fr}
  .aside{position:relative; top:auto}
  h1{font-size:34px}
}