/* ===== 致用页专属样式 ===== */
  /* 撑破父级 .article-container 的 padding */
  .article-container:has(.zhiyong-page) {
    padding: 0;
    background: transparent;
    box-shadow: none;
    border: none;
    backdrop-filter: none;
  }
  .zhiyong-page { padding: 0; }

  /* 卡片网格：4 列 / 3 列 / 2 列 / 1 列 */
  .zhiyong-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }
  .zy-card {
    display: flex;
    flex-direction: column;
    background: rgba(255, 255, 255, 0.98);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
  }
  .zy-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
  }

  /* 卡片顶部封面：渐变背景 + logo */
  .zy-card-cover {
    position: relative;
    aspect-ratio: 4 / 3;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #eef2ff 0%, #f0f9ff 100%);
    overflow: hidden;
  }
  .zy-card-cover::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(67,97,238,0.06) 0%, rgba(114,9,183,0.06) 100%);
    pointer-events: none;
    z-index: 1;
  }
  /* 封面图：铺满整张卡片顶部 */
  .zy-card-cover-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.4s ease;
  }
  .zy-card:hover .zy-card-cover-img { transform: scale(1.05); }
  .zy-card-logo {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--primary-color), #7c9cff);
    color: #fff;
    font-size: 24px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    text-transform: uppercase;
    overflow: hidden;
    box-shadow: 0 4px 14px rgba(67, 97, 238, 0.28);
    position: relative;
    transition: transform 0.4s ease;
  }
  .zy-card:hover .zy-card-logo { transform: scale(1.06) rotate(-2deg); }
  .zy-card-logo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
  .zy-card-badge {
    position: absolute;
    top: 8px;
    left: 8px;
    padding: 2px 8px;
    font-size: 11px;
    color: #fff;
    background: rgba(67, 97, 238, 0.9);
    border-radius: 10px;
    backdrop-filter: blur(4px);
    z-index: 2;
  }
  /* 自定义嵌入代码标识 */
  .zy-card-badge.custom {
    background: rgba(114, 9, 183, 0.9);
  }
  .zy-card-index {
    position: absolute;
    top: 8px;
    right: 8px;
    min-width: 22px;
    height: 22px;
    padding: 0 6px;
    border-radius: 11px;
    background: rgba(255, 255, 255, 0.85);
    color: var(--primary-color);
    font-size: 11px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
    z-index: 2;
  }

  /* 卡片主体 */
  .zy-card-body {
    display: flex;
    flex-direction: column;
    flex: 1;
    padding: 12px 14px;
  }
  .zy-card-title {
    font-size: 14px;
    font-weight: 600;
    line-height: 1.5;
    margin-bottom: 0;
    color: var(--text-color);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex: 1;
  }
  .zy-card:hover .zy-card-title { color: var(--primary-color); }
  .zy-card-title .title-main { font-weight: 600; }
  .zy-card-title .title-desc {
    font-size: 12px;
    font-weight: 400;
    color: var(--text-light);
    margin-left: 4px;
  }

  /* 卡片底部 */
  .zy-card-footer {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    padding-top: 8px;
    margin-top: 8px;
    border-top: 1px solid var(--border-color);
  }
  .zy-card-open {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    color: var(--primary-color);
    font-weight: 500;
    transition: var(--transition);
  }
  .zy-card:hover .zy-card-open { gap: 7px; }

  /* 空状态 */
  .zhiyong-empty {
    text-align: center;
    padding: 60px 20px;
    background: rgba(255,255,255,0.95);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-light);
  }
  .zhiyong-empty i {
    font-size: 48px;
    color: var(--border-color);
    margin-bottom: 16px;
    display: block;
  }
  .zhiyong-empty p { margin-bottom: 18px; }

  /* 响应式 */
  @media (max-width: 1200px) {
    .zhiyong-grid { grid-template-columns: repeat(3, 1fr); }
  }
  @media (max-width: 768px) {
    .zhiyong-grid { grid-template-columns: repeat(2, 1fr); }
  }
  @media (max-width: 480px) {
    .zhiyong-grid { grid-template-columns: 1fr; }
  }