*{box-sizing:border-box;margin:0;padding:0}body{background:linear-gradient(135deg,#0f172a,#1e293b);min-height:100vh;font-family:Arial,sans-serif}.container{justify-content:center;align-items:center;min-height:100vh;padding:20px;display:flex}.card{text-align:center;background:#fff;border-radius:20px;width:100%;max-width:600px;padding:3rem;box-shadow:0 20px 40px #0003}.title{color:#2563eb;margin-bottom:1rem;font-size:2.5rem}.subtitle{color:#64748b;margin-bottom:2rem;font-size:1.1rem}.btn{color:#fff;cursor:pointer;background:#2563eb;border:none;border-radius:10px;padding:12px 28px;font-size:1rem;transition:all .3s}.btn:hover{transform:translateY(-2px)}