:root{--bg:#fff;--fg:#0f172a;--mut:#64748b;--line:#e2e8f0;--brand:#4f46e5;--soft:#eef2ff}
@media(prefers-color-scheme:dark){:root{--bg:#0b1020;--fg:#e2e8f0;--mut:#94a3b8;--line:#1e293b;--brand:#818cf8;--soft:#161d3a}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.65 system-ui,-apple-system,Segoe UI,sans-serif}
a{color:var(--brand)}header,footer,main{max-width:880px;margin:0 auto;padding:20px 16px}
header{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
header a.logo{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--fg);text-decoration:none}
header img{width:34px;height:34px;border-radius:9px}nav a{margin-left:16px;text-decoration:none;font-size:14px}
.hero{padding:48px 0 24px}.hero h1{font-size:clamp(30px,6vw,46px);line-height:1.15;margin:0 0 12px}
.hero p{color:var(--mut);font-size:18px;max-width:620px}
.btn{display:inline-block;background:var(--brand);color:#fff;padding:11px 20px;border-radius:12px;font-weight:700;text-decoration:none}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;margin:28px 0}
.card{border:1px solid var(--line);background:var(--soft);border-radius:14px;padding:16px}.card h3{margin:0 0 6px;font-size:16px}.card p{margin:0;color:var(--mut);font-size:14px}
h2{margin-top:32px}main.doc h1{margin-bottom:4px}.mut{color:var(--mut);font-size:14px}
footer{border-top:1px solid var(--line);color:var(--mut);font-size:14px;margin-top:32px}footer a{margin-right:14px}