body{background:#111;color:#fff;font-family:Arial,sans-serif;padding:20px}
header{text-align:center}
.card{max-width:520px;margin:auto;background:#1c1c1c;padding:20px;border-radius:12px}
input,select,button{width:100%;padding:12px;margin:8px 0;box-sizing:border-box}
button{cursor:pointer}