body{font-family:Arial;background:linear-gradient(135deg,#0f172a,#2563eb);height:100vh;margin:0;display:flex;align-items:center;justify-content:center}
.card{background:#fff;padding:28px;border-radius:18px;box-shadow:0 20px 50px rgba(0,0,0,.2);width:360px}
input{width:100%;padding:12px;margin:8px 0;border:1px solid #d1d5db;border-radius:10px}
button{width:100%;padding:12px;background:#2563eb;color:#fff;border:0;border-radius:10px}
.alert{padding:10px;background:#fee2e2;color:#991b1b;border-radius:10px}