body{margin:0;font-family:Arial,sans-serif;background:#0f172a;color:#fff;display:grid;place-items:center;height:100vh;overflow:hidden}
.bg{position:fixed;inset:0;background:radial-gradient(circle at top,#2563eb,#0f172a)}
.card{position:relative;background:rgba(255,255,255,.08);backdrop-filter:blur(10px);padding:40px;border-radius:16px;text-align:center;box-shadow:0 10px 30px rgba(0,0,0,.35)}
button{padding:12px 22px;border:0;border-radius:8px;background:#3b82f6;color:#fff;cursor:pointer}
button:hover{background:#2563eb}