/* Dim and block PayPal buttons until captcha passes */
  .captcha-locked { pointer-events: none; opacity: .45; position: relative; }
  .captcha-locked::after {
    content: "Complete CAPTCHA to enable PayPal";
    position: absolute; left: 50%; top: 50%; transform: translate(-50%,-50%);
    padding: .5rem .75rem; background: #fff; border: 1px solid #ccc; font: 14px/1.2 sans-serif;
    box-shadow: 0 2px 6px rgba(0,0,0,.1); white-space: nowrap;
  }