:root {
            --primary-color: #ffb600;
            --primary-light: #ffd166;
            --primary-dark: #e6a400;
            --bg-dark: #1a1a1a;
            --bg-light: #ffffff;
            --bg-lighter: #f8f9fa;
            --text-dark: #333;
            --text-medium: #666;
            --text-light: #fff;
            --border-color: #e0e0e0;
            --border-light: #f0f0f0;
            --shadow-light: 0 2px 5px rgba(0,0,0,0.1);
            --shadow-medium: 0 10px 25px rgba(0,0,0,0.1);
            --shadow-heavy: 0 15px 30px rgba(0,0,0,0.15);
            --transition-default: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
            --transition-fast: 0.2s ease;
            --nav-height: 120px;
            --content-max-width: 1800px;
        }

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

        body {
            font-family: 'Arial', 'Microsoft YaHei', sans-serif;
            overflow-x: hidden;
            padding-top: var(--nav-height);
            color: var(--text-dark);
            line-height: 1.6;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-default);
        }

        ul { list-style: none; }
        button { background: none; border: none; cursor: pointer; }
        .dropdown-toggle::after { display: none !important; }

        .header-harting {
            position: fixed;
            top: 0;
            left: 0;
            z-index: 1001;
            width: 100%;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.3);
        }

        .top-contact-bar {
            position: relative;
            height: 40px;
            color: var(--text-light);
            font-size: 14px;
        }

        .top-contact-bar::before {
            content: '';
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 100vw;
            height: 100%;
            background-color: var(--bg-dark);
            z-index: -1;
        }

        .contact-info-container {
            position: relative;
            max-width: var(--content-max-width);
            margin: 0 auto;
            padding: 0 clamp(20px, 8vw, 80px);
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: flex-end;
            gap: clamp(15px, 2vw, 30px);
        }

        .contact-info-item {
            display: flex;
            align-items: center;
            gap: 8px;
            color: inherit;
        }

        .contact-info-item:hover { color: var(--primary-color); }
        .contact-info-icon { color: var(--primary-color); font-size: 14px; }

        .main-nav-bar {
            background-color: var(--bg-light);
            box-shadow: var(--shadow-light);
            height: 80px;
        }

        .main-navigation {
            width: 100%;
            max-width: var(--content-max-width);
            margin: 0 auto;
            padding: 0 clamp(20px, 8vw, 80px);
            display: flex;
            align-items: center;
            justify-content: flex-start;
            height: 100%;
            position: relative;
        }

        .logo-section {
            display: flex;
            align-items: center;
            height: 100%;
            flex-shrink: 0;
            position: absolute;
            left: clamp(20px, 8vw, 80px);
            z-index: 1;
        }

        .logo-harting {
            width: clamp(140px, 15vw, 210px);
            height: clamp(35px, 4vw, 60px);
            display: flex;
            align-items: center;
            transition: transform var(--transition-default);
        }

        .logo-harting:hover { transform: scale(1.03); }
        .logo-harting img { max-height: 100%; max-width: 100%; object-fit: contain; }

        .nav-search-wrapper {
            display: flex;
            align-items: center;
            margin-left: auto;
            height: 100%;
            gap: clamp(20px, 2vw, 40px);
            min-width: 0;
            flex: 1;
            justify-content: flex-end;
        }

        .nav-container { 
            height: 100%; 
            flex-shrink: 0;
            margin-left: auto;
        }

        .nav-menu-harting {
            display: flex;
            align-items: center;
            gap: clamp(2px, 0.5vw, 5px);
            height: 100%;
            justify-content: flex-end;
            flex-wrap: nowrap;
            transition: transform 0.3s ease;
        }

        .nav-item-harting.has-dropdown {
            position: static;
            height: 100%;
            display: flex;
            align-items: center;
            flex-shrink: 0;
        }

        .nav-item-harting {
            position: relative;
            height: 100%;
            display: flex;
            align-items: center;
            flex-shrink: 0;
        }

        .nav-link-harting {
            padding: 12px clamp(12px, 1.2vw, 20px);
            display: flex;
            align-items: center;
            height: 100%;
            font-weight: 500;
            font-size: clamp(15px, 1vw, 17px);
            color: var(--text-dark);
            transition: all var(--transition-default);
            border-radius: 0px;
            white-space: nowrap;
            flex-shrink: 0;
            
            /* 底部边框样式 */
            border-bottom: 3px solid transparent;
            margin-bottom: 0;
            box-sizing: border-box;
        }
        
        .nav-link-harting:hover,
        .nav-link-harting.active { 
            color: var(--primary-color);
            background-color: transparent;
            border-bottom-color: var(--primary-color);
        }
        
        /* 删除原来的hover背景色样式 */
        .nav-link-harting:hover { 
            /* 原来的 background-color: rgba(0, 0, 0, 0.05); 删除 */
        }

        .nav-menu-harting.has-overflow {
            transform: translateX(var(--menu-offset, 0px));
            transition: transform 0.3s ease;
        }

        .search-section {
            display: flex;
            align-items: center;
            height: 100%;
            flex-shrink: 0;
        }

        .search-container-harting { 
            width: clamp(140px, 15vw, 250px);
            flex-shrink: 0;
        }

        .search-form {
            display: flex;
            position: relative;
            height: clamp(30px, 2.5vw, 36px);
        }

        .search-input-harting {
            width: 100%;
            padding: 0 clamp(35px, 3vw, 45px) 0 clamp(8px, 0.8vw, 12px);
            background-color: #f5f5f5;
            border: 1px solid #ddd;
            color: var(--text-dark);
            border-radius: 0;
            font-size: clamp(12px, 0.9vw, 14px);
            transition: all var(--transition-default);
            height: 100%;
        }

        .search-input-harting:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(255, 182, 0, 0.2);
            background-color: var(--bg-light);
        }

        .search-button-harting {
            position: absolute;
            right: 0;
            top: 0;
            height: 100%;
            width: clamp(30px, 2.5vw, 40px);
            color: #666;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all var(--transition-default);
        }

        .search-button-harting:hover {
            color: var(--primary-color);
            background-color: rgba(0, 0, 0, 0.05);
        }

        .menu-toggle {
            display: none;
            align-items: center;
            cursor: pointer;
            font-size: 18px;
            color: var(--text-dark);
            transition: all var(--transition-default);
            padding: 8px 12px;
            border-radius: 0px;
            height: 100%;
            margin-left: clamp(10px, 1.5vw, 20px);
            flex-shrink: 0;
        }

        .menu-toggle:hover { background-color: rgba(0, 0, 0, 0.1); }
        .menu-toggle i { font-size: 20px; margin-right: 8px; }

        /* 修复：确保下拉菜单全屏宽度 */
        .category-mega-menu,
        .other-category-mega-menu {
            position: absolute;
            top: 100%;
            left: 0;
            width: 100vw;
            background: #ffffff;
            opacity: 0;
            visibility: hidden;
            transform: translateY(-15px);
            transition: all var(--transition-default);
            z-index: 1002;
            padding: 0;
            max-height: 0;
            overflow: hidden;
            box-shadow: var(--shadow-medium);
            border-top: 1px solid var(--border-color);
            
            /* 关键修复：确保全屏显示 */
            left: 50%;
            right: 50%;
            margin-left: -50vw;
            margin-right: -50vw;
        }

        .category-mega-menu.active {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
            max-height: 70vh;
            padding: 25px 0;
            border-top: 1px solid var(--border-color);
        }

        /* 修复：产品中心容器居中 */
        .mega-container {
            max-width: var(--content-max-width);
            margin: 0 auto;
            padding: 0 clamp(10px, 4vw, 80px);
            display: flex;
            justify-content: center; /* 新增：居中 */
        }

        /* 修复：产品中心列容器居中 */
        .mega-columns {
            display: flex;
            flex-wrap: nowrap;
            gap: 15px;
            max-width: 1400px;
            width: 100%; /* 新增：确保宽度100% */
            margin: 0 auto; /* 居中 */
            padding-bottom: 8px;
            overflow-x: auto;
            overflow-y: hidden;
            scroll-behavior: smooth;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
            justify-content: center; /* 新增：内容居中 */
        }
        
        .mega-columns::-webkit-scrollbar {
            height: 0;
        }

        .mega-column {
            min-width: 160px;
            flex: 0 0 auto;
            background-color: transparent;
            border-radius: 0;
            overflow: hidden;
            box-shadow: none;
            border: none;
        }

        .mega-header {
            font-weight: 500;
            font-size: clamp(13px, 0.9vw, 15px);
            color: var(--text-dark);
            padding: 12px 15px;
            margin: 0 0 8px 0;
            border-bottom: 1px solid var(--border-color);
            position: relative;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            background-color: transparent;
            display: flex;
            align-items: center;
            justify-content: space-between;
            
            /* 添加过渡效果 */
            transition: all var(--transition-fast);
        }
        
        .mega-header:hover {
            border-bottom-color: var(--primary-color);
        }
        
        .mega-header:hover a {
            color: var(--primary-color);
        }

        .mega-header a {
            color: var(--text-dark);
            transition: color var(--transition-fast);
            display: block;
            flex: 1;
        }

        .mega-header a:hover {
            color: var(--primary-color);
        }

        .mega-links {
            display: flex;
            flex-direction: column;
            gap: 10px;
            padding: 8px 0;
        }

        .mega-links a {
            display: flex;
            align-items: center;
            font-weight: 500;
            color: var(--text-medium);
            font-size: clamp(13px, 0.75vw, 13px);
            padding: 4px 15px;
            transition: all var(--transition-fast);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            position: relative;
            padding-left: 26px;
        }

        .mega-links a::before {
            content: '';
            width: 3px;
            height: 3px;
            border-radius: 50%;
            background-color: #666;
            position: absolute;
            left: 15px;
            top: 50%;
            transform: translateY(-50%);
            opacity: 0.9;
            display: block;
        }

        .mega-links a::after {
            display: none;
        }

        .mega-links a:hover {
            color: var(--primary-dark);
            background-color: transparent;
        }

        .mega-view-all {
            display: none !important;
        }

        .other-category-mega-menu {
            position: absolute;
            top: 100%;
            left: 0;
            width: 100vw;
            background: #ffffff;
            opacity: 0;
            visibility: hidden;
            transform: translateY(-15px);
            transition: all var(--transition-default);
            z-index: 1002;
            padding: 0;
            max-height: 0;
            overflow: hidden;
            box-shadow: var(--shadow-medium);
            border-top: 1px solid var(--border-color);
            
            /* 关键修复：确保全屏显示 */
            left: 50%;
            right: 50%;
            margin-left: -50vw;
            margin-right: -50vw;
        }

        .other-category-mega-menu.active {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
            max-height: 70vh;
            padding: 25px 0 25px 0;
            border-top: 1px solid var(--border-color);
        }

        /* 修复：其他分类容器居中 */
        .other-mega-container {
            max-width: var(--content-max-width);
            margin: 0 auto;
            padding: 0 clamp(15px, 5vw, 80px);
            display: flex;
            justify-content: center; /* 新增：居中 */
        }

        /* 修复：其他分类网格居中 */
        .other-mega-grid {
            display: grid;
            grid-template-columns: repeat(6, 1fr);
            gap: 12px;
            max-width: 1200px;
            width: 100%; /* 新增：确保宽度100% */
            margin: 0 auto;
        }

        .other-grid-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            text-decoration: none;
            color: var(--text-dark);
            transition: all var(--transition-default);
            border-radius: 0px;
            overflow: hidden;
            background-color: var(--bg-light);
            box-shadow: var(--shadow-light);
            padding: 10px;
            border: 1px solid transparent;
            height: 100%;
        }

        .other-grid-item:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-medium);
            border-color: var(--primary-light);
        }

        .other-grid-image {
            width: 100%;
            height: 90px;
            overflow: hidden;
            border-radius: 0px;
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            background-color: var(--bg-lighter);
        }

        .other-grid-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-default);
        }

        .other-grid-item:hover .other-grid-image img {
            transform: scale(1.05);
        }

        .other-grid-title {
            font-weight: 500;
            font-size: clamp(12px, 0.8vw, 14px);
            text-align: center;
            line-height: 1.3;
            color: var(--text-dark);
            transition: color var(--transition-default);
            overflow: hidden;
            text-overflow: ellipsis;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            max-height: 2.6em;
        }

        .other-grid-item:hover .other-grid-title {
            color: var(--primary-color);
        }

        .other-grid-image .default-img {
            width: 50px;
            height: 50px;
            opacity: 0.3;
        }

        /* 关键：确保父容器不限制下拉菜单 */
        .header-harting,
        .main-nav-bar,
        .main-navigation,
        .nav-search-wrapper,
        .nav-container {
            overflow: visible !important;
        }

        @media (min-width: 1920px) {
            .contact-info-container,
            .main-navigation { 
                max-width: var(--content-max-width);
            }
            .mega-columns {
                max-width: 1600px;
            }
            .other-mega-grid {
                max-width: 1400px;
            }
        }

        @media (max-width: 1600px) {
            .mega-columns {
                max-width: 1300px;
            }
            .other-mega-grid {
                max-width: 1100px;
            }
        }

        @media (max-width: 1400px) {
            .mega-columns {
                max-width: 1100px;
            }
            .other-mega-grid {
                max-width: 900px;
            }
        }

        @media (max-width: 1200px) {
            .nav-link-harting { padding: 12px 15px; }
            .mega-columns {
                max-width: 900px;
            }
            .other-mega-grid {
                max-width: 700px;
            }
        }

        @media (max-width: 992px) {
            .nav-container { 
                display: none; 
            }
            
            /* 移动端显示搜索框 */
            .search-section { 
                display: flex; 
                margin-left: auto;
                order: 2; /* 确保在汉堡菜单之前 */
            }
            
            /* 调整搜索框样式适应移动端 */
            .search-container-harting { 
                width: 180px; /* 移动端适当宽度 */
            }
            
            .search-form {
                height: 36px;
            }
            
            .search-input-harting {
                font-size: 14px;
                padding: 0 35px 0 12px;
            }
            
            .menu-toggle { 
                display: flex; 
                margin-left: 10px;
                order: 3; /* 在搜索框之后 */
            }
            
            .contact-dropdown { display: none; }
            
            /* 移动端不需要下拉菜单的复杂定位 */
            .category-mega-menu,
            .other-category-mega-menu {
                display: none;
            }
        }
        
        @media (max-width: 768px) {
            .top-contact-bar { display: none; }
            .main-nav-bar { height: 70px; }
            .logo-harting { 
                width: 160px; 
                height: 40px; 
                left: 20px;
            }
            .main-navigation {
                padding: 0 20px;
            }
            body { padding-top: 70px !important; }
            
            /* 移动端搜索框进一步调整 */
            .search-container-harting { 
                width: 150px;
            }
            
            .search-input-harting {
                font-size: 13px;
            }
            
            /* 移动端菜单项样式 */
            .nav-link-harting {
                border-bottom: none;
            }
            
            .nav-link-harting:hover {
                background-color: rgba(0, 0, 0, 0.05);
            }
        }
        
        @media (max-width: 576px) {
            .logo-harting { 
                width: 140px; 
                height: 35px; 
                left: 15px;
            }
            .main-navigation {
                padding: 0 15px;
            }
            
            /* 小屏幕隐藏搜索框文字 */
            .search-container-harting { 
                width: 120px;
            }
            
            .search-input-harting::placeholder {
                font-size: 12px;
            }
            
            .menu-toggle span { display: none; }
            .menu-toggle i { margin-right: 0; }
        }

        .nav-mobile-container {
            position: fixed;
            top: 70px;
            left: -320px;
            width: 300px;
            height: calc(100vh - 70px);
            background: #161616;
            padding: 0;
            transition: transform 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
            z-index: 1002;
            box-shadow: 5px 0 15px rgba(0,0,0,0.5);
            overflow-y: auto;
        }
        
        .nav-mobile-container.active { 
            transform: translateX(320px); 
        }
        
        .nav-mobile-menu { 
            display: flex; 
            flex-direction: column; 
            margin: 0; 
            padding: 0; 
        }
        
        .nav-mobile-item { 
            position: relative; 
            border-bottom: 1px solid rgba(255,255,255,0.05); 
        }

        .nav-mobile-link {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            padding: 14px 20px;
            font-size: 15px;
            font-weight: 500;
            color: #fff;
            text-align: left;
            background: transparent;
            transition: all 0.3s;
        }
        
        .nav-mobile-link:hover {
            color: #ffb600;
            background: rgba(255,255,255,0.04);
        }
        
        .dropdown-arrow {
            font-size: 12px;
            color: #999;
            transition: transform 0.3s;
        }
        
        .dropdown-arrow.open { 
            transform: rotate(180deg); 
            color: #ffb600; 
        }

        /* 子菜单 - 严格层级、默认关闭 */
        .submenu {
            display: none;
            background: #1c1c1c;
            border-left: 2px solid #ffb600;
        }
        
        .submenu.open { 
            display: block; 
        }
        
        .submenu .nav-mobile-link {
            padding-left: 30px;
            font-size: 14px;
            color: #eee;
        }
        
        .submenu .submenu .nav-mobile-link {
            padding-left: 45px;
            font-size: 13px;
            color: #ddd;
        }

        .nav-overlay {
            position: fixed;
            top: 70px;
            left: 0;
            width: 100%;
            height: calc(100% - 70px);
            background: rgba(0,0,0,0.6);
            z-index: 1001;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s;
        }
        
        .nav-overlay.active { 
            opacity: 1; 
            pointer-events: auto; 
        }
         /* 导航栏与下拉菜单无缝连成整体 */
        .main-nav-bar {
          box-shadow: none !important;
          position: relative;
          z-index: 1001;
        }
        .header-harting {
          box-shadow: var(--shadow-light) !important;
        }
        
        /* 消除下拉容器与导航之间的分割线 + 无缝贴合 */
        .category-mega-menu,
        .other-category-mega-menu {
          border-top: none !important;
          top: calc(100% - 1px) !important;
          margin-top: 0 !important;
          box-shadow: none !important;
          background: #ffffff !important;
        }
        
        /* 激活状态统一阴影，形成整体块效果 */
        .category-mega-menu.active,
        .other-category-mega-menu.active {
          box-shadow: 0 12px 25px -8px rgba(0,0,0,0.12) !important;
          border-top: none !important;
        }
        
        /* 关键：让导航项 hover 时背景延伸，视觉完全闭合 */
        .nav-item-harting.has-dropdown .nav-link-harting {
          position: relative;
          z-index: 1003;
          background: #ffffff !important;
        }