/* 添加页面内容以便测试滚动效果 */
        body {
            padding-top: 90px; /* 为固定导航栏预留空间 */
        }
        
        .content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }
        
        .content h1 {
            margin-bottom: 20px;
        }
        
        .content p {
            margin-bottom: 20px;
            line-height: 1.6;
        }
        
        /* 导航菜单容器 - 修改为固定定位 */
        .head_menu {
            width: 100%;
            background-color: #fff;
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
            position: fixed; /* 修改为固定定位 */
            top: 0; /* 固定在顶部 */
            left: 0;
            z-index: 1000;
            transition: all 0.3s ease;
        }

        /* 导航栏主体 */
        .head_menu-container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 90px;
        }

        /* LOGO部分 */
        .head_menu-logo {
            flex: 0 0 auto;
        }

        .head_menu-logo img {
            height: 70px;
            width: auto;
            transition: all 0.3s ease;
        }

        /* 中间导航分类区域 */
        .head_menu-nav {
            flex: 1 1 auto;
            display: flex;
            justify-content: center;
            position: relative;
        }

        /* 一级分类列表 */
        .head_menu-nav-list {
            display: flex;
            list-style: none;
            height: 90px;
            align-items: center;
        }

        /* 一级分类项 */
        .head_menu-nav-item {
            position: relative;
            margin: 0 25px;
        }

        /* 一级分类链接 */
        .head_menu-nav-link {
            text-decoration: none;
            color: #666666;
            font-weight: 500;
            font-size: 16px;
            padding: 25px 0;
            display: block;
            position: relative;
            transition: color 0.3s ease;
            white-space: nowrap;
        }

        /* 一级分类下划线动画 */
        .head_menu-nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 3px;
            background-color: #e74c3c;
            transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.1);
            transform: translateX(-50%);
            border-radius: 2px;
        }

        /* 鼠标经过一级分类时下划线动画 */
        .head_menu-nav-item:hover .head_menu-nav-link::after {
            width: 100%;
        }

        .head_menu-nav-item:hover .head_menu-nav-link {
            color: #e74c3c;
        }

        /* 二级分类容器 - 修复PC端位置问题 */
        .head_menu-submenu {
            position: absolute;
            top: 70px; /* 修正：从70px开始，确保在导航栏下方 */
            left: 50%;
            transform: translateX(-50%) translateY(10px);
            background-color: white;
            min-width: 150px;
			text-align:center;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
            border-radius: 0px;
            opacity: 0;
                transition: none !important;
			 animation: none !important;
            visibility: hidden;
            z-index: 100;
            padding: 15px 0;
            margin-top: 0;
        }

        /* 鼠标经过时显示二级分类 */
        .head_menu-nav-item:hover .head_menu-submenu {
            opacity: 1;
            visibility: visible;
            transform: translateX(-50%) translateY(0);
        }

        /* 二级分类项 */
        .head_menu-subitem {
            list-style: none;
            position: relative;
        }

        /* 二级分类分隔线 */
        .head_menu-subitem:not(:last-child)::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 20px;
            right: 20px;
            height: 1px;
            background-color: #f0f0f0;
        }

        /* 二级分类链接 */
        .head_menu-sublink {
            text-decoration: none;
            color: #555;
            display: block;
            padding: 12px 24px;
            font-size: 14.5px;
            transition: all 0.25s ease;
            line-height: 1.4;
        }

        .head_menu-sublink:hover {
            color: #e74c3c;
            background-color: #f9f9f9;
            padding-left: 30px;
        }

        /* 右侧搜索区域 */
        .head_menu-search {
            flex: 0 0 auto;
            display: flex;
            align-items: center;
        }

        /* 桌面端搜索框 */
        .head_menu-search-desktop {
            display: flex;
            align-items: center;
            background-color: #f5f5f5;
            border-radius: 30px;
            padding: 8px 15px;
            width: 250px;
            transition: all 0.3s ease;
        }

        .head_menu-search-desktop:focus-within {
            background-color: #f0f0f0;
            box-shadow: 0 0 0 2px rgba(231, 76, 60, 0.1);
        }

        .head_menu-search-input {
            border: none;
            background: transparent;
            outline: none;
            flex: 1;
            padding: 5px 10px;
            font-size: 14.5px;
            color: #333;
        }

        .head_menu-search-button {
            background: transparent;
            border: none;
            color: #777;
            cursor: pointer;
            font-size: 16px;
            transition: color 0.3s ease;
            padding: 5px;
        }

        .head_menu-search-button:hover {
            color: #e74c3c;
        }

        /* 移动端菜单按钮 */
        .head_menu-mobile-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 22px;
            color: #333;
            cursor: pointer;
            padding: 8px;
            margin-left: 15px;
        }

        /* 移动端搜索图标 */
        .head_menu-mobile-search {
            display: none;
            background: none;
            border: none;
            font-size: 18px;
            color: #333;
            cursor: pointer;
            padding: 8px;
        }

        /* 移动端搜索容器 */
        .head_menu-mobile-search-container {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            background: white;
            padding: 15px 20px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            z-index: 1001;
        }

        .head_menu-mobile-search-box {
            display: flex;
            align-items: center;
            background-color: #f5f5f5;
            border-radius: 30px;
            padding: 10px 15px;
        }

        .head_menu-mobile-search-input {
            flex: 1;
            border: none;
            background: transparent;
            outline: none;
            padding: 5px 10px;
            font-size: 15px;
        }

        .head_menu-mobile-search-btn {
            background: none;
            border: none;
            color: #e74c3c;
            font-size: 16px;
            cursor: pointer;
            padding: 5px;
        }

        /* 移动端菜单容器 - 修复二级分类显示问题 */
        .head_menu-mobile-nav {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            background: white;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.5s ease;
            z-index: 1000;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }

        .head_menu-mobile-nav.active {
            max-height: 80vh;
            overflow-y: auto;
        }

        /* 移动端一级分类 */
        .head_menu-mobile-item {
            border-bottom: 1px solid #f0f0f0;
        }

        .head_menu-mobile-link {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 16px 20px;
            text-decoration: none;
            color: #333;
            font-weight: 600;
            font-size: 16px;
            position: relative;
            cursor: pointer;
        }

        /* 修复移动端二级分类显示 */
        .head_menu-mobile-submenu {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease;
            background-color: #f9f9f9;
            /* 确保二级分类可见 */
            visibility: visible;
            opacity: 1;
            display: block;
        }

        .head_menu-mobile-submenu.active {
            max-height: 500px;
        }

        .head_menu-mobile-sublink {
            display: block;
            padding: 14px 20px 14px 35px;
            text-decoration: none;
            color: #555;
            font-size: 14.5px;
            border-bottom: 1px solid #f0f0f0;
        }

        .head_menu-mobile-sublink:last-child {
            border-bottom: none;
        }

        .head_menu-mobile-sublink:hover {
            background-color: #f0f0f0;
        }

        /* 移动端菜单箭头 */
        .head_menu-mobile-arrow {
            transition: transform 0.3s ease;
        }

        .head_menu-mobile-item.active .head_menu-mobile-arrow {
            transform: rotate(180deg);
        }

        /* 响应式设计 */
        @media (max-width: 1024px) {
            /* 平板端适配 */
            .head_menu-nav-item {
                margin: 0 12px;
            }
            
            .head_menu-search-desktop {
                width: 200px;
            }
            
            /* 修正平板端二级菜单位置 */
            .head_menu-submenu {
                top: 70px;
            }
        }

        @media (max-width: 768px) {
            /* 移动端适配 */
            body {
                padding-top: 60px; /* 调整移动端预留空间 */
            }
            
            .head_menu-container {
                height: 60px;
                padding: 0 15px;
            }
            
            .head_menu-nav, .head_menu-search-desktop {
                display: none;
            }
            
            .head_menu-mobile-search, .head_menu-mobile-toggle {
                display: block;
            }
            
            .head_menu-logo img {
                height: 34px;
            }
            
            .head_menu-mobile-nav {
                display: block; /* 确保移动端菜单显示 */
            }
            
            .head_menu-mobile-nav.active {
                max-height: 70vh;
            }
            
            /* 确保移动端二级分类完全显示 */
            .head_menu-mobile-submenu.active {
                max-height: 1000px; /* 足够大的值确保显示所有二级分类 */
            }
        }

        /* 动画效果 */
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(-10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .head_menu-submenu {
            animation: fadeIn 0.3s ease forwards;
        }
        
        /* 滚动时导航栏样式变化 - 可选 */
        .head_menu.scrolled {
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
        }