:root{--bg:#f5f7fa;--ink:#1c2430;--muted:#5b6b7d;--brand:#1763d6;--brand2:#0f9d6b;--card:#fff;--line:#e3e9f0}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,Segoe UI,Roboto,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.top{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}
.nav{display:flex;align-items:center;gap:24px;height:64px}
.logo{font-weight:800;font-size:20px;color:var(--ink)}
.logo span{color:var(--brand)}
.nav nav{display:flex;gap:20px;margin-left:8px}
.nav nav a{color:var(--muted);font-weight:500}
.nav .btn{margin-left:auto}
.btn{display:inline-block;background:var(--brand);color:#fff;padding:10px 18px;border-radius:8px;font-weight:600}
.btn:hover{text-decoration:none;opacity:.92}
.btn.ghost{background:transparent;color:var(--brand);border:1px solid var(--brand)}
.hero{background:linear-gradient(180deg,#eaf1fc,#f5f7fa);padding:64px 0 48px;border-bottom:1px solid var(--line)}
.hero h1{font-size:40px;margin:0 0 12px;line-height:1.15}
.lead{font-size:19px;color:var(--muted);max-width:680px}
.hero-actions{margin:24px 0 18px;display:flex;gap:12px;flex-wrap:wrap}
.badges{display:flex;gap:18px;flex-wrap:wrap;color:var(--muted);font-size:14px;margin-top:10px}
.section{padding:48px 0}
h2{font-size:28px;margin:0 0 24px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px;display:block;color:var(--ink)}
.card:hover{text-decoration:none;border-color:var(--brand);box-shadow:0 6px 24px rgba(23,99,214,.08)}
.card h3{margin:0 0 8px;font-size:18px}
.card p{margin:0;color:var(--muted);font-size:15px}
.band{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.feat b{display:block;margin-bottom:6px}
.feat p{color:var(--muted);margin:0}
.cta{text-align:center}
.cta p{color:var(--muted);max-width:620px;margin:0 auto 20px}
.foot{background:#0f1722;color:#9fb0c3;padding:28px 0;margin-top:24px;font-size:14px}
.foot .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
/* article */
.doc{background:#fff;border:1px solid var(--line);border-radius:12px;padding:32px;margin:32px 0}
.doc h1{font-size:30px;margin-top:0}
.doc h2{font-size:22px;margin-top:28px}
.doc ol,.doc ul{padding-left:22px}
.doc li{margin:6px 0}
.doc code{background:#eef2f7;padding:2px 6px;border-radius:5px;font-size:14px}
.note{background:#eef7f1;border-left:4px solid var(--brand2);padding:12px 16px;border-radius:6px;margin:16px 0}
.warn{background:#fff5ec;border-left:4px solid #e08b2d;padding:12px 16px;border-radius:6px;margin:16px 0}
.crumbs{color:var(--muted);font-size:14px;margin:24px 0 0}
table.kv{border-collapse:collapse;width:100%;margin:16px 0}
table.kv td{border:1px solid var(--line);padding:8px 12px}
@media(max-width:820px){.grid,.grid3{grid-template-columns:1fr 1fr}.nav nav{display:none}.hero h1{font-size:30px}}
@media(max-width:560px){.grid,.grid3{grid-template-columns:1fr}}