body{display:flex;align-items:center;justify-content:center;min-height:100vh;background:linear-gradient(90deg,#ebf8ff,#1e293b);font-family:Arial,sans-serif;margin:0}.card{width:100%;max-width:400px;padding:24px;background-color:white;border-radius:16px;box-shadow:0 10px 25px rgba(0,0,0,.1);border:1px solid #ddd;text-align:center}.card-title{font-size:24px;font-weight:700;color:#333}.card p{color:#555;font-size:14px;margin-top:10px}.button{width:100%;padding:12px;margin-top:16px;background:#1e293b;color:white;border:none;border-radius:8px;font-size:16px;cursor:pointer;transition:all .3s ease}.button:hover{background:#334155}.button:disabled{background:#888;cursor:not-allowed}.spinner{width:20px;height:20px;border:3px solid white;border-top-color:transparent;border-radius:50%;animation:spin .8s linear infinite;display:inline-block;vertical-align:middle;margin-right:8px}@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}