:root{--bg:#ffffff;--fg:#1a1f2b;--muted:#5b6475;--brand:#1a73e8;--brand-dark:#1557b0;--soft:#f4f7fb;--line:#e3e8ef}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif}
a{color:var(--brand)}
.wrap{max-width:1040px;margin:0 auto;padding:0 20px}
header.top{border-bottom:1px solid var(--line);background:#fff;position:sticky;top:0;z-index:10}
header.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px;flex-wrap:wrap}
.logo{font-weight:800;font-size:20px;color:var(--fg);text-decoration:none}
.logo span{color:var(--brand)}
nav a{color:var(--muted);text-decoration:none;margin-left:18px;font-size:15px}
nav a:hover{color:var(--brand)}
.hero{background:linear-gradient(180deg,var(--soft),#fff);padding:72px 0 56px}
.hero h1{font-size:clamp(30px,5vw,46px);line-height:1.15;margin:0 0 16px}
.hero p.lead{font-size:20px;color:var(--muted);max-width:720px;margin:0 0 28px}
.btn{display:inline-block;background:var(--brand);color:#fff;text-decoration:none;padding:13px 24px;border-radius:8px;font-weight:600}
.btn:hover{background:var(--brand-dark)}
.btn.ghost{background:transparent;color:var(--brand);border:1px solid var(--brand);margin-left:10px}
section{padding:56px 0}
section.alt{background:var(--soft)}
h2{font-size:30px;margin:0 0 14px}
h3{font-size:20px;margin:0 0 8px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px;margin-top:28px}
.card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:22px}
.card p{margin:0;color:var(--muted)}
ol.steps{padding-left:22px}
ol.steps li{margin-bottom:10px}
.note{border-left:4px solid var(--brand);background:#fff;padding:16px 20px;border-radius:6px}
table{width:100%;border-collapse:collapse;margin-top:16px;font-size:15px}
th,td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
th{background:var(--soft)}
.doc{padding:48px 0}
.doc h1{font-size:36px;margin:0 0 6px}
.doc h2{font-size:24px;margin-top:36px}
.doc .updated{color:var(--muted);margin-bottom:28px}
footer{border-top:1px solid var(--line);padding:32px 0;color:var(--muted);font-size:14px}
footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}
footer a{color:var(--muted);margin-right:16px}
@media (max-width:600px){nav a{margin-left:0;margin-right:14px}.btn.ghost{margin:10px 0 0}}