:root{--fg:#1f2a37;--muted:#6b7280;--bg:#fff;--line:#e5e7eb;--pri:#1d4ed8}
*{box-sizing:border-box}html,body{margin:0}body{font:16px/1.6 system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial;color:var(--fg);background:var(--bg)}
.container{max-width:1024px;margin:0 auto;padding:24px 16px}.h1{font-size:28px;margin:8px 0 16px}
.nav{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding:10px 16px;background:#fff}
.nav a{text-decoration:none;color:var(--fg);margin-right:14px}
.btn{display:inline-block;padding:8px 14px;border:1px solid var(--line);border-radius:8px;text-decoration:none}
.btn-primary{border-color:var(--pri);background:var(--pri);color:#fff}
.card{border:1px solid var(--line);border-radius:12px;padding:16px;background:#fff;margin:8px 0}
.grid-3{display:grid;grid-template-columns:repeat(1,1fr);gap:16px}@media(min-width:720px){.grid-3{grid-template-columns:repeat(3,1fr)}}
.list{padding-left:18px}.list li{margin:4px 0}.footer{border-top:1px solid var(--line);padding:12px 16px;color:#6b7280;font-size:14px}