:root{--ink:#1a2233;--muted:#5b6475;--brand:#1E88E5;--bg:#f7f9fc;--card:#fff;--line:#e3e8f0}
*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6}
.wrap{max-width:820px;margin:0 auto;padding:0 20px}
header{background:var(--card);border-bottom:1px solid var(--line)}header .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}
.brand{font-weight:700;font-size:20px;color:var(--ink);text-decoration:none}.brand span{color:var(--brand)}
nav a{color:var(--muted);text-decoration:none;margin-left:18px;font-size:15px}nav a:hover{color:var(--brand)}
main{padding:36px 0 56px}h1{font-size:30px;line-height:1.25;margin:0 0 8px}h2{font-size:20px;margin:30px 0 8px}
.lead{color:var(--muted);font-size:17px}.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px;margin:14px 0}
ul{padding-left:20px}li{margin:4px 0}.btn{display:inline-block;background:var(--brand);color:#fff;padding:11px 20px;border-radius:10px;text-decoration:none;font-weight:600}
footer{border-top:1px solid var(--line);padding:22px 0;color:var(--muted);font-size:14px}footer a{color:var(--muted)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}