body { font-family: system-ui, sans-serif; background: #f5f5f5; margin: 0; }
main { max-width: 480px; margin: 10vh auto; padding: 24px; background: #fff; border-radius: 12px; }
.btn { display: inline-block; padding: 10px 14px; margin-right: 8px; background: #222; color: #fff; border-radius: 8px; text-decoration: none; }
button { padding: 10px 14px; border-radius: 8px; border: 1px solid #222; background: #fff; cursor: pointer; }