:root{--bg:#fff;--fg:#1c2330;--muted:#5b6575;--accent:#2457d6;--card:#f4f6fb;--line:#e1e5ee}
@media (prefers-color-scheme:dark){:root{--bg:#0f1420;--fg:#e8ecf5;--muted:#9aa4b8;--accent:#6c93ff;--card:#171e2e;--line:#27304a}}
*{box-sizing:border-box}
body{margin:0;font:16px/1.65 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--fg)}
a{color:var(--accent)}
.wrap{max-width:1000px;margin:0 auto;padding:0 16px}
.nav{border-bottom:1px solid var(--line);position:sticky;top:0;background:var(--bg);z-index:5}
.nav-in{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px;padding-top:12px;padding-bottom:12px}
.brand{font-weight:700;font-size:1.15rem;text-decoration:none;color:var(--fg)}
.nav nav a{margin-left:16px;text-decoration:none;color:var(--muted)}
.nav nav a:hover{color:var(--accent)}
.hero{padding:80px 0;background:var(--card);border-bottom:1px solid var(--line)}
.hero h1{font-size:clamp(2rem,6vw,3.2rem);margin:0 0 12px}
.lead{font-size:1.2rem;color:var(--muted);max-width:640px}
.btn{display:inline-block;margin-top:12px;padding:10px 22px;background:var(--accent);color:#fff;border-radius:8px;text-decoration:none;font-weight:600}
.block{padding-top:48px;padding-bottom:16px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px}
.card h3{margin:0 0 8px}.card p{margin:0;color:var(--muted)}
.note{color:var(--muted);margin-top:16px}
.doc{padding-top:40px;padding-bottom:48px;max-width:760px}
.doc h2{margin-top:32px;font-size:1.25rem}
.muted{color:var(--muted)}
footer{margin-top:48px;border-top:1px solid var(--line);background:var(--card);padding:28px 0 16px}
.foot{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px}
.links a{display:block;margin-bottom:4px}
.copy{margin-top:16px;color:var(--muted);font-size:.9rem}