body { background: #0e0e0e; color: #fff; font-family: Arial, sans-serif; padding: 2em; text-align: center; }
h1 { color: #00ffc3; }
.card { background: #1c1c1c; margin: 1.5em auto; padding: 1.5em; border-radius: 10px; max-width: 600px; }
.btn { background: #00ffc3; color: #000; padding: 12px 24px; font-size: 1.2em; border: none; border-radius: 8px; cursor: pointer; margin-top: 1em; }
.highlight { color: #ffd700; font-weight: bold; }