body{margin:0;font-family:Arial,sans-serif;background:linear-gradient(135deg,#1e3a8a,#0f172a);display:flex;justify-content:center;align-items:center;height:100vh;color:#fff}.card{background:rgba(255,255,255,.1);padding:40px;border-radius:16px;text-align:center;max-width:520px;box-shadow:0 8px 30px rgba(0,0,0,.3)}h1{margin-top:0}