/* Loader Styles */
    #universal-loader {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: white;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      z-index: 9999;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.3s ease;
    }
    
    #universal-loader.active {
      opacity: 1;
      pointer-events: all;
    }
    
    .smart-book-loader {
      width: 100px;
      height: 70px;
      position: relative;
      perspective: 150px;
      margin-bottom: 20px;
    }
    
    .book-page {
      position: absolute;
      width: 50%;
      height: 100%;
      background: #00b0f0;
      border: 2px solid white;
      box-sizing: border-box;
    }
    
    .left-page {
      left: 0;
      border-radius: 5px 0 0 5px;
      transform-origin: right center;
      animation: flip-left 1.5s infinite ease-in-out;
    }
    
    .right-page {
      right: 0;
      border-radius: 0 5px 5px 0;
      transform-origin: left center;
      animation: flip-right 1.5s infinite ease-in-out;
      animation-delay: 0.75s;
    }
    
    @keyframes flip-left {
      0% { transform: rotateY(0); }
      50% { transform: rotateY(-180deg); }
      100% { transform: rotateY(0); }
    }
    
    @keyframes flip-right {
      0% { transform: rotateY(0); }
      50% { transform: rotateY(180deg); }
      100% { transform: rotateY(0); }
    }
    
    .loader-message {
      color: #00b0f0;
      font-family: Arial, sans-serif;
      font-size: 16px;
      margin-top: 15px;
    }

    /* Buffering indicator for videos/audio */
    .media-buffering {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      z-index: 10;
      display: none;
    }