#loading-spinner {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-color: rgba(0, 0, 0, 0.5);
      z-index: 10000;
      display: none;
      justify-content: center;
      align-items: center;
    }
.spinner {
      border: 8px solid #f3f3f3;
      border-top: 8px solid #3498db;
      border-radius: 50%;
      width: 60px;
      height: 60px;
      animation: spin 2s linear infinite;
    }
@keyframes spin {
      0% { transform: rotate(0deg); }
      100% { transform: rotate(360deg); }
    }