.book-link {
    width: 100%;
    background-size: cover;
    background-position: center;
    border-radius: 3px 0.5px 0.5px 3px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease;
    aspect-ratio: 115 / 180;
    position: relative;
  }

  .book-link:hover {
    transform: translateY(-5px);
  }

  /* 自定义提示框样式 */
  .book-tooltip {
    position: absolute;
    width: 320px;
    background: linear-gradient(135deg, #2c3e50, #4a6491);
    color: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    z-index: 1000;
    font-size: 14px;
    line-height: 1.6;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    pointer-events: none;
    text-align: left;
  }

  .book-tooltip.visible {
    opacity: 1;
    visibility: visible;
  }

  .tooltip-header {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  }

  .tooltip-cover {
    width: 60px;
    height: 80px;
    background-size: cover;
    background-position: center;
    border-radius: 5px;
    margin-right: 15px;
    flex-shrink: 0;
  }

  .tooltip-title {
    font-weight: bold;
    font-size: 18px;
    color: #ffdd59;
    margin-bottom: 5px;
  }

  .tooltip-author {
    font-size: 14px;
    color: #a0c0ff;
    font-style: italic;
  }

  .tooltip-content {
    margin-bottom: 10px;
  }

  .tooltip-content p {
    margin-bottom: 10px;
  }

  .tooltip-footer {
    font-style: italic;
    font-size: 13px;
    color: #a0c0ff;
    border-top: 1px solid rgba(255, 255, 255, 0.3);
    padding-top: 10px;
    text-align: center;
  }

  .instructions {
    margin-top: 40px;
    padding: 20px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 10px;
    text-align: left;
  }

  .instructions h3 {
    margin-bottom: 15px;
    color: #ffdd59;
  }

  .instructions code {
    background: rgba(0, 0, 0, 0.3);
    padding: 2px 5px;
    border-radius: 4px;
  }

  footer {
    margin-top: 40px;
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.8;
  }