/* Full screen overlay */
  #loaderOverlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5); /* semi-transparent */
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    flex-direction: column;
    font-family: Arial, sans-serif;
  }

  /* Loader spinner */
  .spinner {
    border: 8px solid #f3f3f3; /* Light grey */
    border-top: 8px solid #3498db; /* Blue */
    border-radius: 50%;
    width: 60px;
    height: 60px;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
  }

  /* Spinner animation */
  @keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }

  /* Loader message */
  #loaderMessage {
    color: #fff;
    font-size: 1.2rem;
    text-align: center;
  }

  /* Responsive adjustments */
  @media (max-width: 600px) {
    .spinner {
      width: 40px;
      height: 40px;
      border-width: 6px;
    }
    #loaderMessage {
      font-size: 1rem;
    }
  }