#preloader-captcha {
  font-family: Arial, sans-serif;
  transition: opacity 0.5s;
  background: linear-gradient(135deg,#181824 0%,#0a0a0f 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  min-width: 100vw;
}
#preloader-captcha input:focus {
  border: 2px solid #a855f7;
}
#preloader-captcha button:hover {
  background: #3b82f6;
}
#preloader-captcha .preloader-spinner {
  margin-top: 2rem;
  width: 48px;
  height: 48px;
  border: 6px solid #a855f7;
  border-top: 6px solid #fff;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}
@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}
@media (max-width: 600px) {
  #preloader-captcha div {
    font-size: 1.1rem !important;
  }
  #preloader-captcha .preloader-spinner {
    width: 32px;
    height: 32px;
    border-width: 4px;
  }
}