:root{
  --navy:#003366;
  --cyan:#00B7D8;
  --bg:#ffffff;
  --text:#0f172a;
  --muted:#475569;
  --border:#e5e7eb;
}
*{box-sizing:border-box;}
body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;line-height:1.6;color:var(--text);background:var(--bg);}
header{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.88);backdrop-filter: blur(10px);border-bottom:1px solid var(--border);}
.topbar{max-width:1100px;margin:0 auto;padding:12px 16px;display:flex;align-items:center;justify-content:space-between;gap:16px;}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;color:var(--navy);text-decoration:none;font-size:1.15rem;}
.brand-mark{width:38px;height:38px;border-radius:12px;display:grid;place-items:center;color:#fff;background:linear-gradient(135deg,var(--navy),var(--cyan));font-weight:800;}
.btn-back{display:inline-flex;align-items:center;gap:8px;padding:10px 14px;border-radius:999px;border:1px solid var(--border);text-decoration:none;color:var(--navy);background:#fff;font-weight:600;white-space:nowrap;}
.btn-back:hover{border-color:#cbd5e1;background:#f8fafc;}
main{max-width:900px;margin:0 auto;padding:28px 16px 56px;}
.card{background:#fff;border:1px solid var(--border);border-radius:16px;padding:22px;box-shadow:0 1px 2px rgba(0,0,0,.04);}
h1{font-size:28px;line-height:1.2;margin:0 0 12px;}
h2{font-size:18px;margin:22px 0 8px;}
p,li{color:var(--muted);} ul{padding-left:18px;margin:10px 0;}
footer{border-top:1px solid var(--border);padding:18px 16px;color:var(--muted);} footer .wrap{max-width:1100px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;} footer a{color:var(--navy);text-decoration:none;} footer a:hover{text-decoration:underline;}
@media (max-width:520px){h1{font-size:24px;}.card{padding:18px;}}