:root{
  --bg:#f7f8fa;--surface:#fff;--text:#1b2330;--muted:#5b6675;--line:#e3e7ed;
  --brand:#1f5fbf;--brand-soft:#e8f0fc;--ok:#1e7a4c;
  --radius:14px;--max:1040px;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#0f141b;--surface:#161d27;--text:#e6ebf2;--muted:#9aa6b6;--line:#263041;--brand:#6fa3ff;--brand-soft:#1b2a44;--ok:#5fd39a}
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.65 "Inter",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
a{color:var(--brand)}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
header.top{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
header.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px;flex-wrap:wrap}
.logo{font-weight:700;text-decoration:none;color:var(--text);letter-spacing:-.01em}
.logo span{color:var(--brand)}
nav a{color:var(--muted);text-decoration:none;margin-left:18px;font-size:.95rem}
nav a:hover{color:var(--text)}
.hero{padding:72px 0 56px}
.hero h1{font-size:clamp(1.9rem,4vw,2.8rem);line-height:1.15;margin:0 0 16px;letter-spacing:-.02em;max-width:780px}
.hero p{font-size:1.15rem;color:var(--muted);max-width:680px;margin:0 0 28px}
.btn{display:inline-block;background:var(--brand);color:#fff;padding:12px 22px;border-radius:10px;text-decoration:none;font-weight:600}
.btn.ghost{background:transparent;color:var(--brand);border:1px solid var(--brand);margin-left:8px}
section{padding:48px 0;border-top:1px solid var(--line)}
section h2{font-size:1.6rem;margin:0 0 8px;letter-spacing:-.01em}
section .lead{color:var(--muted);margin:0 0 28px;max-width:720px}
.grid{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.card h3{margin:0 0 6px;font-size:1.08rem}
.card p{margin:0;color:var(--muted);font-size:.97rem}
.steps{counter-reset:s;list-style:none;padding:0;margin:0;display:grid;gap:14px}
.steps li{counter-increment:s;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px 18px 18px 64px;position:relative}
.steps li::before{content:counter(s);position:absolute;left:18px;top:16px;width:32px;height:32px;border-radius:50%;background:var(--brand-soft);color:var(--brand);font-weight:700;display:grid;place-items:center}
.note{background:var(--brand-soft);border-radius:var(--radius);padding:18px 20px}
.check{list-style:none;padding:0;margin:0}
.check li{padding-left:28px;position:relative;margin:8px 0}
.check li::before{content:"✓";position:absolute;left:0;color:var(--ok);font-weight:700}
.x li::before{content:"✕";color:#c0392b}
dl.info{display:grid;grid-template-columns:max-content 1fr;gap:8px 20px;margin:0}
dl.info dt{color:var(--muted)}
dl.info dd{margin:0;font-weight:500}
@media (max-width:560px){dl.info{grid-template-columns:1fr}dl.info dd{margin-bottom:8px}nav a{margin:0 14px 0 0}}
.doc{padding:48px 0 64px}
.doc h1{font-size:2rem;margin:0 0 6px}
.doc .updated{color:var(--muted);margin:0 0 32px}
.doc h2{font-size:1.25rem;margin:32px 0 8px}
.doc article{max-width:760px}
footer{background:var(--surface);border-top:1px solid var(--line);padding:32px 0;color:var(--muted);font-size:.9rem}
footer .wrap{display:flex;flex-wrap:wrap;gap:24px;justify-content:space-between}
footer a{color:var(--muted)}
footer .links a{margin-right:16px}