:root{--bg:#fbfaf7;--fg:#16181d;--muted:#5b616e;--line:#e6e2da;--accent:#2f5bea;--card:#fff}
@media (prefers-color-scheme:dark){:root{--bg:#0f1115;--fg:#eef0f4;--muted:#a3a9b6;--line:#262a33;--accent:#7b9bff;--card:#161920}}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.6 -apple-system,BlinkMacSystemFont,"Inter","Segoe UI",Roboto,sans-serif}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
.wrap{max-width:960px;margin:0 auto;padding:0 20px}
header{border-bottom:1px solid var(--line)}
header .wrap{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{font-weight:650;color:var(--fg);letter-spacing:-.01em;display:flex;align-items:center;gap:10px}
.mark{width:28px;height:28px;border-radius:8px;background:var(--accent);display:grid;place-items:center;color:#fff;font-size:15px;font-weight:700}
nav a{color:var(--muted);margin-left:22px;font-size:15px}
.hero{padding:96px 0 72px}
.hero h1{font-size:clamp(34px,6vw,56px);line-height:1.08;letter-spacing:-.03em;margin:0 0 20px;max-width:14ch}
.hero p{font-size:20px;color:var(--muted);max-width:40ch;margin:0 0 32px}
.btn{display:inline-block;background:var(--fg);color:var(--bg);padding:13px 22px;border-radius:10px;font-weight:600}
.btn:hover{text-decoration:none;opacity:.9}
section{padding:56px 0;border-top:1px solid var(--line)}
h2{font-size:26px;letter-spacing:-.02em;margin:0 0 28px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:24px}
.card h3{margin:0 0 8px;font-size:18px}.card p{margin:0;color:var(--muted);font-size:16px}
.doc{padding:64px 0;max-width:720px}.doc h1{font-size:36px;letter-spacing:-.02em;margin:0 0 8px}
.doc h2{font-size:21px;margin:36px 0 10px}.doc p,.doc li{color:var(--muted)}
footer{border-top:1px solid var(--line);padding:36px 0 48px;font-size:14px;color:var(--muted)}
footer .links a{color:var(--muted);margin-right:18px}
footer p{margin:10px 0 0;max-width:70ch}