body{margin:0;font-family:Arial,sans-serif;background:#0b1220;color:#fff}header{display:flex;justify-content:space-between;padding:16px 24px;background:#101a30;position:sticky;top:0}nav a{color:#fff;margin:0 10px;text-decoration:none}.hero{padding:80px 20px;text-align:center;background:linear-gradient(135deg,#1d4ed8,#06b6d4)}.btn{display:inline-block;padding:12px 20px;background:#fff;color:#0b1220;border-radius:8px;text-decoration:none;font-weight:bold}section{padding:40px 20px;max-width:900px;margin:auto}footer{text-align:center;padding:20px;background:#101a30}