/* 主体布局 */
    .page-main { flex: 1; max-width: 1200px; margin: 0 auto; padding: 32px; width: 100%; }
    .page-wrapper { display: flex; gap: 28px; }

    /* 侧边栏 */
    .sidebar { width: 240px; flex-shrink: 0; }
    .sidebar-section { margin-bottom: 24px; }
    .sidebar-title {
      font-size: 0.85rem; font-weight: 700; color: var(--navy); text-transform: uppercase;
      letter-spacing: 1px; margin-bottom: 12px; padding-bottom: 8px; border-bottom: 2px solid var(--gray-200);
    }
    .sidebar-menu { list-style: none; }
    .sidebar-menu li { margin-bottom: 2px; }
    .sidebar-menu a {
      display: flex; align-items: center; gap: 8px; padding: 8px 12px; border-radius: var(--radius);
      font-size: 0.85rem; color: var(--gray-600); transition: var(--transition);
    }
    .sidebar-menu a:hover, .sidebar-menu a.active { background: var(--gray-100); color: var(--gold); }
    .sidebar-contact {
      background: var(--white); border: 1px solid var(--gray-200); border-radius: var(--radius);
      padding: 16px; font-size: 0.82rem; color: var(--gray-600);
    }
    .sidebar-contact p { margin-bottom: 6px; line-height: 1.5; }
    .sidebar-contact strong { display: block; margin-bottom: 8px; color: var(--navy); font-size: 0.85rem; }

    /* 主内容 */
    .main-content { flex: 1; min-width: 0; }
    .breadcrumb { font-size: 0.8rem; color: var(--gray-400); margin-bottom: 20px; }
    .breadcrumb a { color: var(--blue); }
    .breadcrumb a:hover { color: var(--gold); }

    /* 产品详情 */
    .product-detail {
      background: var(--white); border: 1px solid var(--gray-200);
      border-radius: var(--radius-lg); overflow: hidden;
    }
    .product-detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0; }
    .product-detail-image {
      aspect-ratio: 1/1; background: var(--gray-50); display: flex;
      align-items: center; justify-content: center; padding: 40px;
      border-right: 1px solid var(--gray-200);
    }
    .product-detail-image img { max-width: 80%; max-height: 80%; }
    .product-detail-info { padding: 32px; display: flex; flex-direction: column; }
    .product-detail-info h1 { font-size: 1.8rem; font-weight: 700; color: var(--navy); margin-bottom: 6px; line-height: 1.3; }
    .product-model { font-size: 0.9rem; color: var(--blue); font-weight: 500; margin-bottom: 16px; }
    .product-specs {
      background: var(--gray-50); border-radius: var(--radius); padding: 18px;
      margin-bottom: 20px; flex: 1;
    }
    .product-specs h3 { font-size: 0.85rem; font-weight: 600; color: var(--navy); margin-bottom: 10px; }
    .spec-row { display: flex; justify-content: space-between; padding: 6px 0; font-size: 0.85rem; border-bottom: 1px solid var(--gray-200); }
    .spec-row:last-child { border-bottom: none; }
    .spec-label { color: var(--gray-600); }
    .spec-value { color: var(--navy); font-weight: 500; }
    .btn-group { display: flex; gap: 10px; flex-wrap: wrap; }
    .btn-primary { padding: 11px 24px; background: var(--gold); color: #fff; border: none; border-radius: var(--radius); font-weight: 600; font-size: 0.88rem; cursor: pointer; transition: var(--transition); display: inline-flex; align-items: center; gap: 6px; }
    .btn-primary:hover { background: var(--gold-hover); }
    .btn-secondary { padding: 11px 24px; background: var(--blue); color: #fff; border: none; border-radius: var(--radius); font-weight: 500; font-size: 0.88rem; cursor: pointer; transition: var(--transition); display: inline-flex; align-items: center; gap: 6px; }
    .btn-secondary:hover { background: var(--blue-hover); }

    /* 产品描述 */
    .product-description {
      margin-top: 24px; background: var(--white); border: 1px solid var(--gray-200);
      border-radius: var(--radius-lg); padding: 28px;
    }
    .product-description h2 { font-size: 1.2rem; font-weight: 700; color: var(--navy); margin-bottom: 14px; padding-bottom: 10px; border-bottom: 1px solid var(--gray-200); }
    .product-description p { font-size: 0.9rem; color: var(--gray-600); line-height: 1.8; margin-bottom: 12px; }
    .product-description ul { padding-left: 20px; margin-bottom: 12px; }
    .product-description li { font-size: 0.9rem; color: var(--gray-600); margin-bottom: 6px; }

    /* 响应式 */
    @media (max-width: 1024px) {
  .container, .page-main { padding: 0 20px; }
  .page-main { padding: 24px 20px; }
  .mobile-btn { display: block; }
  .main-nav {
    position: fixed; top: 0; right: -280px; width: 260px; height: 100vh;
    background: #fff; flex-direction: column; gap: 0; padding: 72px 20px 24px;
    box-shadow: -4px 0 20px rgba(0,0,0,0.1); transition: right 0.3s; z-index: 101; overflow-y: auto;
  }
  .main-nav.active { right: 0; }
  .lang-switch { display: none; }
  .nav-item { width: 100%; border-bottom: 1px solid var(--gray-200); }
  .nav-link { padding: 14px 0; display: flex; justify-content: space-between; width: 100%; }
  .submenu { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: none; display: none; padding-left: 12px; }
  .nav-item.submenu-open .submenu { display: block; }
  
  .page-wrapper { flex-direction: column; }
  .sidebar { width: 100%; order: 2; }
  .main-content { order: 1; min-width: 100%; }
  
  .product-detail-grid { grid-template-columns: 1fr; }
  .product-detail-image { border-right: none; border-bottom: 1px solid var(--gray-200); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

    @media (max-width: 640px) {
      .product-detail-info { padding: 20px; }
      .product-detail-info h1 { font-size: 1.4rem; }
      .product-detail-image { padding: 24px; }
      .product-description { padding: 20px; }
      .btn-group { flex-direction: column; }
      .btn-primary, .btn-secondary { justify-content: center; }
      .footer-grid { grid-template-columns: 1fr; gap: 20px; }
    }