/* Ensure existing .button display rules cannot reveal inactive form steps. */
#contact-form [hidden] { display: none !important; }
#contact-form button:disabled { cursor: wait; opacity: .65; }
#contact-form button + button { margin: 12px 0 0 12px; }
@media (max-width: 520px) {
  #contact-form button + button { margin-left: 0; }
}