body{margin:0;font-family:Arial,sans-serif;background:#0f172a;color:#fff}
header{text-align:center;padding:60px;background:linear-gradient(135deg,#7c3aed,#2563eb)}
nav{display:flex;justify-content:center;gap:20px;padding:15px;background:#111827}
nav a{color:#fff;text-decoration:none}
section{max-width:1000px;margin:auto;padding:40px 20px}
.card{display:inline-block;background:#1e293b;padding:20px;border-radius:10px;margin:10px}