.section-padding {
    padding: var(--spacing-xxxl) 0;
  }
  
  .section-title {
    text-align: center;
    margin-bottom: var(--spacing-xxl);
  }
  
  .section-title h2 {
    font-size: var(--font-size-xlarge);
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
    position: relative;
    display: inline-block;
  }
  
  .section-title h2::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--color-primary);
  }
  
  .section-title p {
    font-size: var(--font-size-large);
    color: var(--color-text-light);
    max-width: 700px;
    margin: var(--spacing-xl) auto 0;
  }
  
  .btn {
    display: inline-block;
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    text-decoration: none;
    font-weight: var(--font-weight-bold);
    transition: var(--transition-normal);
    border: none;
    cursor: pointer;
    font-size: var(--font-size-base);
  }
  
  .btn:hover {
    background: var(--color-primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(229, 57, 53, 0.3);
  }
  
  .btn-outline {
    background: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
  }
  
  .btn-outline:hover {
    background: var(--color-primary);
    color: white;
  }
  
/* 产品分类导航 */
.product-nav {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin: var(--spacing-xl) 0;
  }
  
  .product-nav a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-background-light);
    color: var(--color-text);
    text-decoration: none;
    border-radius: var(--border-radius-md);
    transition: var(--transition-normal);
    font-weight: var(--font-weight-bold);
    border: 1px solid var(--color-border);
  }
  
  .product-nav a:hover,
  .product-nav a.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
  }
  
  /* 产品分类区域 */
  .product-category {
    margin-bottom: var(--spacing-xxxl);
    padding-top: var(--spacing-xxl);
  }
  
  .category-header {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-primary);
  }
  
  .category-header h3 {
    font-size: var(--font-size-xlarge);
    color: var(--color-secondary);
    margin-right: var(--spacing-md);
    margin-bottom: 0;
    margin-left: 0.5rem;
  }
  
  .category-icon {
    width: 50px;
    height: 50px;
    background: rgba(26, 58, 143, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xlarge);
    color: var(--color-primary);
  }
  
  .category-description {
    font-size: var(--font-size-large);
    color: var(--color-text);
    margin-bottom: var(--spacing-xl);
    max-width: 800px;
    line-height: 1.7;
  }
  
  /* 产品网格 */
  .products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
  }
  
  .product-card {
    background: var(--color-background);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--box-shadow-sm);
    transition: var(--transition-normal);
    position: relative;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.5s ease forwards;
  }
  
  .product-card.visible {
    opacity: 1;
    transform: translateY(0);
  }
  
  .product-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--box-shadow-lg);
  }
  
  .product-badge {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-small);
    font-weight: var(--font-weight-bold);
    z-index: 2;
  }
  
  .product-image {
    height: 250px;
    overflow: hidden;
    position: relative;
  }
  
  .product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
  }
  
  .product-card:hover .product-image img {
    transform: scale(1.05);
  }
  
  .product-content {
    padding: var(--spacing-lg);
  }
  
  .product-title {
    font-size: var(--font-size-large);
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
  }
  
  .product-features {
    list-style: none;
    margin-bottom: var(--spacing-lg);
  }
  
  .product-features li {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-base);
    color: var(--color-text);
  }
  
  .product-features li i {
    color: var(--color-primary);
    margin-right: var(--spacing-sm);
    min-width: 20px;
  }
  
  .product-actions {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-sm);
  }
  
  .product-actions .btn {
    flex: 1;
    text-align: center;
  }
  
  /* 产品详情模态框 */
  .modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
  }
  
  .modal-overlay.active {
    opacity: 1;
    visibility: visible;
  }
  
  .product-modal {
    background: var(--color-background);
    width: 90%;
    max-width: 1000px;
    max-height: 76vh;
    overflow-y: auto;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md);
    position: relative;
    transform: translateY(50px);
    transition: transform var(--transition-normal);
  }
  
  .modal-overlay.active .product-modal {
    transform: translateY(0);
  }
  
  .modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: none;
    border: none;
    font-size: var(--font-size-xlarge);
    color: var(--color-text-light);
    cursor: pointer;
    transition: var(--transition-fast);
  }
  
  .modal-close:hover {
    color: var(--color-primary);
  }
  
  .modal-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
  }
  
  .modal-images {
    position: relative;
  }
  
  .modal-main-image {
    height: 400px;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
  }
  
  .modal-main-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
  
  .modal-thumbnails {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-sm);
  }
  
  .modal-thumb {
    height: 80px;
    border-radius: var(--border-radius-sm);
    overflow: hidden;
    cursor: pointer;
    opacity: 0.7;
    transition: var(--transition-fast);
  }
  
  .modal-thumb:hover,
  .modal-thumb.active {
    opacity: 1;
    border: 2px solid var(--color-primary);
  }
  
  .modal-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
  
  .modal-details h3 {
    font-size: var(--font-size-xlarge);
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
  }
  
  .modal-specs {
    list-style: none;
    margin: var(--spacing-lg) 0;
  }
  
  .modal-specs li {
    display: flex;
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--color-border);
  }
  
  .modal-specs li span:first-child {
    font-weight: var(--font-weight-bold);
    min-width: 120px;
    color: var(--color-secondary);
  }
  
  .modal-description {
    margin-top: var(--spacing-xl);
    line-height: 1.7;
  }
  
  /* 动画 */
  @keyframes fadeInUp {
    from {
      opacity: 0;
      transform: translateY(30px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
  
  /* 响应式设计 */
  @media (max-width: 992px) {
    .modal-content {
      grid-template-columns: 1fr;
    }
    
    .modal-images {
      margin-bottom: var(--spacing-xl);
    }
  }
  
  @media (max-width: 768px) {
    .section-padding {
      padding: var(--spacing-xxl) 0;
    }
    
    .product-nav {
      flex-direction: column;
      align-items: center;
      max-width: 300px;
      margin: var(--spacing-xl) auto;
    }
    
    .product-nav a {
      width: 100%;
      text-align: center;
    }
  }
  
  @media (max-width: 576px) {
    .section-title h2 {
      font-size: var(--font-size-large);
    }
    
    .section-title p {
      font-size: var(--font-size-base);
    }
    
    .category-header h3 {
      font-size: var(--font-size-large);
    }
    
    .category-description {
      font-size: var(--font-size-base);
    }
  }

  .btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-large);
  }