:root{--bg:#ffffff;--fg:#111827;--muted:#4b5563;--line:#e5e7eb;--card:#f7f8fc;--brand:#0a2878;--accent:#1a56db;--on-accent:#ffffff}
@media (prefers-color-scheme:dark){:root{--bg:#0f1115;--fg:#e5e7eb;--muted:#9ca3af;--line:#262a33;--card:#171a21;--brand:#c7d4ff;--accent:#7aa2ff;--on-accent:#0f1115}}
*{box-sizing:border-box}
body{margin:0;font:17px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--fg);background:var(--bg)}
.wrap{max-width:960px;margin:0 auto;padding:0 20px}
header{border-bottom:1px solid var(--line)}
header .wrap{display:flex;gap:16px;align-items:center;justify-content:space-between;flex-wrap:wrap;padding-top:14px;padding-bottom:14px}
.logo{font-weight:800;font-size:20px;color:var(--brand);text-decoration:none}
nav a{margin-left:18px;color:var(--muted);text-decoration:none;font-size:15px}
nav a:hover{color:var(--accent)}
.hero{padding:64px 0 48px}
h1{font-size:clamp(30px,5vw,46px);line-height:1.15;margin:0 0 14px;color:var(--brand)}
h2{font-size:26px;margin:0 0 12px;color:var(--brand)}
h3{font-size:18px;margin:0 0 6px}
.lead{font-size:19px;color:var(--muted);max-width:640px}
.btn{display:inline-block;margin-top:20px;padding:12px 22px;border-radius:10px;background:var(--accent);color:var(--on-accent);text-decoration:none;font-weight:600}
section{padding:40px 0;border-top:1px solid var(--line)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin-top:18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px}
.card p{margin:0;color:var(--muted);font-size:15.5px}
ol.steps{padding-left:22px}
ol.steps li{margin:8px 0}
a{color:var(--accent)}
footer{border-top:1px solid var(--line);padding:28px 0;color:var(--muted);font-size:14px}
footer a{color:var(--muted);margin-right:16px}
.doc{padding:40px 0 60px;max-width:760px}
.doc h1{font-size:clamp(28px,4vw,38px)}
.doc h2{margin-top:34px;font-size:22px}
.doc ul{padding-left:22px}
.doc li{margin:6px 0}
.meta{color:var(--muted);font-size:14px}