/* 新增样式 - 2025年3月29日 */
    :root {
      --primary-color: #ff6a00;
      --secondary-color: #000000;  /* 德国国旗黑色 */
      --accent-color: #3498db;
      --text-color: #333;
      --light-gray: #f5f5f5;
      --border-color: #ddd;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: 'Inter', sans-serif;
      line-height: 1.6;
      color: var(--text-color);
    }

    .container {
      max-width: 1440px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* Header Styles */
    .top-header {
      background: var(--secondary-color);
      color: white;
      padding: 8px 0;
      font-size: 14px;
    }

    .top-header .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .contact-info {
      display: flex;
      gap: 20px;
    }

    .contact-info span {
      transition: color 0.3s;
      cursor: pointer;
    }

    .contact-info span:hover {
      color: var(--primary-color);
    }

    .language-selector {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .language-selector a {
      color: inherit;
      text-decoration: none;
      transition: color 0.3s;
    }

    .language-selector a:hover {
      color: var(--primary-color);
    }

    .main-header {
      padding: 20px 0;
      background: white;
      box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    }

    .main-header .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .logo img {
      max-height: 60px;
    }

    .nav-menu {
      display: flex;
      gap: 30px;
    }

    .nav-menu a {
      color: var(--text-color);
      text-decoration: none;
      font-weight: 500;
      transition: color 0.3s;
    }

    .nav-menu a:hover {
      color: var(--primary-color);
    }

    /* Hero Section */
    .hero {
      position: relative;
      height: 600px;
      background: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5)), url('../../images/slides-1903-480-ssf-1.webp');
      background-size: cover;
      background-position: center;
      color: white;
      display: flex;
      align-items: center;
      text-align: center;
    }

    .hero-content {
      max-width: 800px;
      margin: 0 auto;
      padding: 0 20px;
    }

    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .hero p {
      font-size: 20px;
      margin-bottom: 30px;
    }

    .cta-buttons {
      display: flex;
      gap: 20px;
      justify-content: center;
    }

    .btn {
      display: inline-block;
      padding: 12px 30px;
      border-radius: 5px;
      text-decoration: none;
      font-weight: 600;
      transition: all 0.3s;
      cursor: pointer;
    }

    .btn-primary {
      background: var(--primary-color);
      color: white;
    }

    .btn-primary:hover {
      background: #ff8533;
      transform: translateY(-2px);
    }

    .btn-secondary {
      background: white;
      color: var(--primary-color);
    }

    .btn-secondary:hover {
      background: #f5f5f5;
      transform: translateY(-2px);
    }

    /* Features Section */
    .features {
      padding: 80px 0;
      background: var(--light-gray);
    }

    .section-title {
      text-align: center;
      margin-bottom: 50px;
    }

    .section-title h2 {
      font-size: 36px;
      color: var(--secondary-color);
      margin-bottom: 15px;
    }

    .features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 30px;
    }

    .feature-card {
      background: white;
      padding: 30px;
      border-radius: 10px;
      text-align: center;
      transition: transform 0.3s;
    }

    .feature-card:hover {
      transform: translateY(-5px);
    }

    .feature-card i {
      font-size: 3em;
      color: var(--primary-color);
      margin-bottom: 20px;
      display: block;
    }

    .feature-card h3 {
      margin-bottom: 15px;
      color: var(--secondary-color);
    }

    /* Products Section */
    .products {
      padding: 80px 0;
    }

    .product-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
    }

    .product-card {
      background: white;
      border-radius: 10px;
      overflow: hidden;
      box-shadow: 0 2px 10px rgba(0,0,0,0.1);
      transition: transform 0.3s;
    }

    .product-card:hover {
      transform: translateY(-5px);
    }

    .product-image {
      height: 200px;
      overflow: hidden;
    }

    .product-image img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .product-info {
      padding: 20px;
      display: flex;
      flex-direction: column;
      height: calc(100% - 200px); /* 减去图片高度 */
    }

    .product-info h3 {
      margin-bottom: 10px;
      color: var(--secondary-color);
      font-size: 18px;
      line-height: 1.4;
    }

    .product-info p {
      color: #666;
      margin-bottom: 15px;
      flex-grow: 1; /* 让描述文本占据剩余空间 */
    }

    .product-actions {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-top: auto; /* 将操作区域推到底部 */
    }

    .category-tag {
      display: inline-block;
      padding: 4px 12px;
      background: var(--light-gray);
      color: var(--secondary-color);
      border-radius: 4px;
      font-size: 12px;
      font-weight: 500;
      transition: all 0.3s;
    }

    .product-card:hover .category-tag {
      background: var(--primary-color);
      color: white;
    }

    .product-actions .btn {
      padding: 8px 20px;
      font-size: 14px;
      margin-left: 10px;
    }

    /* Footer Styles */
    footer {
      background: var(--secondary-color);
      color: white;
      padding: 8px 0;
    }

    .footer-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 14px;
    }

    .footer-left {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .footer-right {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .footer-right a {
      color: inherit;
      text-decoration: none;
      transition: color 0.3s;
    }

    .footer-right a:hover {
      color: var(--primary-color);
    }

    .footer-divider {
      margin: 0 8px;
      color: rgba(255,255,255,0.5);
    }

    /* 返回顶部按钮样式 */
    #topBtn {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background: var(--secondary-color);
      border: none;
      opacity: 0.8;
      transition: all 0.3s;
      border-radius: 0;
      width: 40px;
      height: 40px;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      z-index: 1000;
      color: white;
    }

    #topBtn:hover {
      opacity: 1;
    }

    #topBtn svg {
      transition: transform 0.3s;
    }

    #topBtn:hover svg {
      transform: translateY(-2px);
    }

    /* Error Message Styles */
    .error-message {
      background: #fff3f3;
      color: #dc3545;
      padding: 15px;
      border-radius: 5px;
      margin: 20px 0;
      text-align: center;
    }

    /* Responsive Design */
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
      }

      .hero h1 {
        font-size: 36px;
      }

      .hero p {
        font-size: 18px;
      }

      .cta-buttons {
        flex-direction: column;
      }

      .feature-card,
      .product-card {
        margin-bottom: 20px;
      }

      .footer-container {
        flex-direction: column;
        gap: 15px;
        padding: 15px 0;
      }

      .footer-right {
        flex-wrap: wrap;
        justify-content: center;
      }

      .contact-info {
        flex-direction: column;
        gap: 5px;
      }

      .language-selector {
        display: none;
      }

      .product-actions {
        flex-direction: column;
        gap: 10px;
        align-items: stretch;
      }
      
      .category-tag {
        text-align: center;
      }
      
      .product-actions .btn {
        margin-left: 0;
        text-align: center;
      }
    }

    /* Header 样式更新 */
    .header-left {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .menu-btn {
      display: flex;
      align-items: center;
      gap: 8px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
      color: var(--secondary-color);
      font-size: 16px;
      transition: color 0.3s;
      -webkit-tap-highlight-color: transparent;
      user-select: none;
      -webkit-user-select: none;
    }

    .menu-btn:hover {
      color: var(--primary-color);
    }

    .menu-icon {
      font-size: 20px;
    }

    .menu-text {
      font-weight: 500;
      letter-spacing: 1px;
    }

    /* 侧边菜单样式 */
    .side-menu-wrapper {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: 9999;
      visibility: hidden;
      -webkit-transform: translateZ(0);
      transform: translateZ(0);
      will-change: visibility;
    }

    .side-menu-wrapper.active {
      visibility: visible;
    }

    .side-menu {
      position: fixed;
      top: 0;
      left: -320px;
      width: 320px;
      height: 100%;
      background: rgba(44, 62, 80, 0.95);
      box-shadow: 2px 0 10px rgba(0,0,0,0.1);
      transition: transform 0.3s ease-out;
      -webkit-transition: -webkit-transform 0.3s ease-out;
      overflow-y: auto;
      -webkit-overflow-scrolling: touch;
      z-index: 2;
      will-change: transform;
      backface-visibility: hidden;
      -webkit-backface-visibility: hidden;
    }

    .side-menu-wrapper.active .side-menu {
      transform: translateX(320px);
      -webkit-transform: translateX(320px);
    }

    .side-menu-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0,0,0,0.5);
      opacity: 0;
      transition: opacity 0.3s ease-out;
      -webkit-transition: opacity 0.3s ease-out;
      z-index: 1;
      will-change: opacity;
      pointer-events: none;
    }

    .side-menu-wrapper.active .side-menu-overlay {
      opacity: 1;
      pointer-events: auto;
    }

    .side-menu-header {
      padding: 20px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
      display: flex;
      justify-content: flex-end;
    }

    .close-menu {
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: #fff;
      padding: 5px;
      transition: color 0.3s;
    }

    .close-menu:hover {
      color: var(--primary-color);
    }

    .side-menu-content {
      padding: 20px;
    }

    .menu-list {
      list-style: none;
      padding: 0;
      margin: 0;
    }

    .menu-item {
      margin-bottom: 0 !important;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05) !important;
    }

    .menu-item:last-child {
      border-bottom: none !important;
    }

    .menu-link {
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: #fff;
      text-decoration: none;
      font-size: 16px;
      padding: 15px 10px !important;
      transition: all 0.3s ease;
    }

    .menu-link:hover {
      color: var(--primary-color);
      background-color: rgba(255, 255, 255, 0.05);
    }

    .submenu {
      list-style: none;
      padding: 0;
      margin: 0;
      background: transparent;
      border-radius: 0;
      border-left: none;
      display: block !important;
      padding-left: 15px;
    }

    .submenu li {
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
      margin: 0;
    }

    .submenu li:last-child {
      border-bottom: none;
    }

    .submenu a {
      color: rgba(255, 255, 255, 0.8);
      text-decoration: none;
      padding: 12px 15px 12px 15px;
      display: block;
      font-size: 14px;
      transition: all 0.3s;
      position: relative;
    }

    .submenu a:before {
      content: '';
      position: absolute;
      left: 0;
      top: 50%;
      transform: translateY(-50%);
      width: 4px;
      height: 4px;
      border-radius: 50%;
      background-color: rgba(255, 255, 255, 0.3);
      transition: background-color 0.3s, transform 0.2s;
    }

    .submenu a:hover {
      color: var(--primary-color);
      background: rgba(255, 255, 255, 0.05);
      padding-left: 20px;
    }

    .submenu a:hover:before {
      background-color: var(--primary-color);
      transform: translateY(-50%) scale(1.2);
    }

    .has-submenu > .menu-link {
      color: #fff;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 1px;
      font-size: 14px;
      padding: 15px 0 15px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.15) !important;
      background-color: transparent;
      display: block;
      padding-left: 10px;
      position: relative;
    }

    .has-submenu > .menu-link:after {
      content: none;
    }

    /* 禁止滚动类 */
    .no-scroll {
      overflow: hidden !important;
      width: 100%;
      position: fixed;
      overscroll-behavior: none;
      -ms-scroll-chaining: none;
    }

    /* 响应式调整 */
    @media (max-width: 768px) {
      .menu-btn {
        padding: 5px;
      }
      
      .menu-text {
        display: none;
      }
      
      .side-menu {
        width: 280px;
        left: -280px;
      }
      
      .side-menu-wrapper.active .side-menu {
        transform: translateX(280px);
      }
    }

    /* 优化滚动条样式 */
    .side-menu::-webkit-scrollbar {
      width: 6px;
    }

    .side-menu::-webkit-scrollbar-track {
      background: rgba(255, 255, 255, 0.1);
    }

    .side-menu::-webkit-scrollbar-thumb {
      background: rgba(255, 255, 255, 0.2);
      border-radius: 3px;
    }

    .side-menu::-webkit-scrollbar-thumb:hover {
      background: rgba(255, 255, 255, 0.3);
    }