/* Loader CSS */
      #loader {
        display: none;
        border: 8px solid #f3f3f3;
        border-radius: 50%;
        border-top: 8px solid #3498db;
        width: 40px;
        height: 40px;
        animation: spin 1s linear infinite;
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
      }

      @keyframes spin {
        0% { transform: translate(-50%, -50%) rotate(0deg); }
        100% { transform: translate(-50%, -50%) rotate(360deg); }
      }

      /* Centering audio player */
      #audioPlayer {
        display: none;
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
      }