:root{--ink:#1d2430;--muted:#5b6575;--accent:#1f4e79;--bg:#f6f7f9;--line:#e3e6ea}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:#fff;line-height:1.65}
a{color:var(--accent)}
header.top{border-bottom:1px solid var(--line);background:#fff}
.wrap{max-width:880px;margin:0 auto;padding:0 24px}
.top .wrap{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{font-weight:700;font-size:1.25rem;letter-spacing:.2px;color:var(--ink);text-decoration:none}
nav a{margin-left:22px;text-decoration:none;color:var(--muted);font-size:.95rem}
nav a:hover{color:var(--accent)}
.hero{background:var(--bg);border-bottom:1px solid var(--line);padding:84px 0 72px}
.hero h1{font-size:2.5rem;line-height:1.2;margin:0 0 12px}
.hero p{font-size:1.2rem;color:var(--muted);margin:0}
section{padding:56px 0;border-bottom:1px solid var(--line)}
section h2{font-size:1.35rem;margin:0 0 14px}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.card{border:1px solid var(--line);border-radius:8px;padding:22px 24px;background:#fff}
.card h3{margin:0 0 6px;font-size:1rem;color:var(--muted);font-weight:600;text-transform:uppercase;letter-spacing:.6px}
.card p{margin:0}
main.doc{padding:48px 0 64px}
main.doc h1{font-size:1.9rem;margin:0 0 .5em}
main.doc h2{font-size:1.2rem;margin:1.8em 0 .4em}
main.doc img{max-width:100%;border:1px solid #ccc}
.muted{color:var(--muted);font-size:.95rem}
footer{padding:28px 0 40px;color:var(--muted);font-size:.9rem}
footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}
footer a{color:var(--muted);margin-left:18px}
@media(max-width:640px){.grid{grid-template-columns:1fr}.hero h1{font-size:2rem}nav a{margin-left:14px}}