/* ========= 导航栏容器：始终固定在顶部，默认透明 ========= */
        .head_nav_container {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background-color: transparent;
            transition: background-color 0.3s ease, box-shadow 0.3s ease, border-bottom 0.2s;
            border-bottom: 1px solid transparent;
        }
        
        /* 滚动时添加白色背景和阴影（JS控制添加class） */
        .head_nav_container.nav-scrolled {
            background-color: #ffffff !important;
            border-bottom: 1px solid #eaeef2;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
        }
        /* 非滚动状态下悬停变白底 */
        .head_nav_container:not(.nav-scrolled):hover {
            background-color: #ffffff;
            border-bottom: 1px solid #eaeef2;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
        }
        
        .nav_inner_wrap {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            height: 80px;
            padding: 0 32px;
            margin: 0 auto;
        }

        /* Logo */
        .head_nav_logo {
            display: inline-block;
            text-decoration: none;
            flex-shrink: 0;
            margin-right: 20px;
        }
        .logo-img {
            height: 60px;
            width: auto;
            display: block;
            object-fit: contain;
        }

        /* 桌面菜单 */
        .head_nav_menu {
            display: inline-block;
            margin: 0;
            padding: 0;
            white-space: nowrap;
        }
        .head_nav_menu_item_wrap {
            display: inline-block;
            position: relative;
            height: 80px;
            vertical-align: middle;
            margin-left: 4px;
            margin-right: 4px;
        }
        .head_nav_menu_item {
            display: flex;
            align-items: center;
            height: 80px;
            padding: 0 18px;
            text-decoration: none;
            color: #333333;
            font-size: 16px;
            font-weight: 500;
            transition: color 0.25s;
            white-space: nowrap;
            letter-spacing: 0.3px;
            text-shadow: 0 1px 1px rgba(0,0,0,0.1);
        }
        /* 滚动时或悬停时菜单文字颜色变深 */
        .head_nav_container.nav-scrolled .head_nav_menu_item,
        .head_nav_container:hover .head_nav_menu_item {
            color: #2c3e50;
            text-shadow: none;
        }
        
        .head_nav_menu_item_wrap.has-dropdown .head_nav_menu_item {
            cursor: pointer;
        }
        .head_nav_menu_item_wrap .head_nav_menu_item i {
            margin-left: 6px;
            font-size: 12px;
        }

        /* 下拉菜单 */
        .dropdown_menu {
            position: absolute;
            top: 100%;
            left: 0;
            background: #ffffff;
            min-width: 220px;
            border-radius: 0px;
            box-shadow: 0 20px 35px -8px rgba(0, 0, 0, 0.12);
            padding: 12px 0;
            opacity: 0;
            visibility: hidden;
            transform: translateY(12px);
            transition: opacity 0.25s, visibility 0.25s, transform 0.2s;
            z-index: 100;
            border: 1px solid #f0f2f5;
        }
        .head_nav_menu_item_wrap:hover .dropdown_menu {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }
        .dropdown_menu a {
            display: block;
            padding: 10px 20px;
            color: #666666;
            text-decoration: none;
            font-size: 15px;
            transition: background 0.2s, padding-left 0.2s;
        }
        .dropdown_menu a:hover {
            background: #f0f7ff;
            color: #1b69b3;
            padding-left: 26px;
        }
        .product_dropdown {
            min-width: 260px;
        }

        /* 右侧搜索区域 */
        .head_nav_actions {
            display: flex;
            align-items: center;
            flex-shrink: 0;
            margin-left: 10px;
        }
        .head_nav_search_wrap {
            position: relative;
            display: inline-block;
        }
        .head_nav_search_btn {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 48px;
            height: 48px;
            color: #666666;
            font-size: 20px;
            cursor: pointer;
            border-radius: 40px;
            transition: background 0.2s, color 0.2s;
        }
        .head_nav_container.nav-scrolled .head_nav_search_btn,
        .head_nav_container:hover .head_nav_search_btn {
            color: #1b69b3;
        }
        .head_nav_search_btn:hover {
            background: rgba(0,0,0,0.08);
        }
        .head_nav_container.nav-scrolled .head_nav_search_btn:hover,
        .head_nav_container:hover .head_nav_search_btn:hover {
            background: #f0f2f5;
            color: #1b69b3;
        }
        
        .search_panel {
            position: absolute;
            top: calc(100% + 12px);
            right: 0;
            width: 320px;
            background: #ffffff;
            border-radius: 0px;
            box-shadow: 0 25px 40px -12px rgba(0, 0, 0, 0.2);
            padding: 16px 20px;
            z-index: 200;
            opacity: 0;
            visibility: hidden;
            transform: translateY(-8px);
            transition: opacity 0.2s, visibility 0.2s, transform 0.2s;
            border: 1px solid #edf2f7;
            display: flex;
            align-items: center;
        }
        .head_nav_search_wrap:hover .search_panel {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }
        .search_panel input {
            flex: 1;
            border: none;
            outline: none;
            padding: 12px 0;
            font-size: 15px;
            background: transparent;
            color: #1f2d3d;
            border-bottom: 1px solid #e2e8f0;
            margin-right: 12px;
        }
        .search_panel input:focus {
            border-bottom-color: #1e50a5;
        }
        .search_panel button {
            background: #1b69b3;
            border: none;
            color: white;
            padding: 8px 18px;
            border-radius: 40px;
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            transition: background 0.2s;
        }
        .search_panel button:hover {
            background: #0f4d8a;
        }

        /* 移动端图标组 */
        .mobile_actions {
            display: none;
        }
        .mobile_search_dropdown,
        .mobile_overlay,
        .mobile_nav {
            display: none;
        }

        /* ========= 移动端样式 ========= */
        @media screen and (max-width: 900px) {
            .head_nav_container {
                background-color: #ffffff !important;
                border-bottom: 1px solid #eaeef2;
                box-shadow: 0 2px 8px rgba(0,0,0,0.05);
            }
            .head_nav_container.nav-scrolled {
                background-color: #ffffff !important;
            }
            .head_nav_container:hover {
                background-color: #ffffff !important;
            }
            .head_nav_menu {
                display: none;
            }
            .head_nav_search_wrap {
                display: none;
            }
            .nav_inner_wrap {
                height: 64px;
                padding: 0 12px;
            }
            .logo-img {
                height: 38px;
            }
            .mobile_actions {
                display: flex !important;
                align-items: center;
                gap: 8px;
            }
            .mobile_search_btn_red {
                display: flex;
                align-items: center;
                justify-content: center;
                width: 42px;
                height: 42px;
                background: #1b69b3;
                color: white;
                font-size: 18px;
                border-radius: 42px;
                cursor: pointer;
                box-shadow: 0 2px 6px rgba(221,0,0,0.2);
            }
            .mobile_menu_toggle_red {
                display: flex;
                align-items: center;
                justify-content: center;
                width: 42px;
                height: 42px;
                background: #1b69b3;
                color: white;
                font-size: 22px;
                border-radius: 42px;
                cursor: pointer;
                box-shadow: 0 2px 6px rgba(221,0,0,0.2);
            }
            .mobile_search_dropdown {
                display: flex;
                position: fixed;
                top: 64px;
                left: 0;
                right: 0;
                background: white;
                z-index: 250;
                box-shadow: 0 8px 20px rgba(0,0,0,0.1);
                border-top: 1px solid #f0f0f0;
                transform: translateY(-20px);
                opacity: 0;
                visibility: hidden;
                transition: 0.25s;
                height: 52px;
            }
            .mobile_search_dropdown.show {
                opacity: 1;
                visibility: visible;
                transform: translateY(0);
            }
            .mobile_search_dropdown input {
                flex: 1;
                height: 52px;
                border: none;
                outline: none;
                padding: 0 16px;
                font-size: 15px;
            }
            .mobile_search_dropdown button {
                width: 56px;
                height: 52px;
                background: #1b69b3;
                border: none;
                color: white;
                font-size: 18px;
                cursor: pointer;
            }
            .mobile_overlay {
                display: block;
                position: fixed;
                top: 0;
                left: 0;
                width: 100%;
                height: 100%;
                background: rgba(0,0,0,0.5);
                z-index: 300;
                visibility: hidden;
                opacity: 0;
                transition: 0.2s;
            }
            .mobile_overlay.active {
                visibility: visible;
                opacity: 1;
            }
            .mobile_nav {
                display: block;
                position: fixed;
                top: 0;
                right: -280px;
                width: 280px;
                max-width: 85vw;
                height: 100%;
                background: #fff;
                z-index: 350;
                padding: 20px 16px;
                transition: right 0.3s;
                overflow-y: auto;
            }
            .mobile_nav.open {
                right: 0;
            }
            .mobile_nav_header {
                display: flex;
                justify-content: space-between;
                align-items: center;
                padding-bottom: 16px;
                border-bottom: 1px solid #eceff5;
                margin-bottom: 12px;
            }
            .mobile_nav_header img {
                height: 32px;
            }
            .close_mobile_menu {
                font-size: 26px;
                cursor: pointer;
                color: #6c7a8e;
            }
            .mobile_menu_item {
                border-bottom: 1px solid #f1f3f8;
                width: 100%;
                overflow: hidden;
            }
            .mobile_menu_title {
                display: flex;
                justify-content: space-between;
                align-items: center;
                padding: 12px 0;
                font-size: 16px;
                font-weight: 500;
                color: #1f2d3d;
                cursor: pointer;
            }
            .mobile_menu_title a {
                text-decoration: none;
                color: inherit;
                flex: 1;
            }
            .mobile_menu_title i {
                font-size: 13px;
                transition: transform 0.2s;
                color: #8e9aaf;
            }
            .mobile_submenu {
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.35s;
                background: #fafcff;
                border-radius: 10px;
            }
            .mobile_submenu.open {
                max-height: 400px;
            }
            .mobile_submenu a {
                display: block;
                padding: 10px 0 10px 16px;
                text-decoration: none;
                color: #4a5b6e;
                font-size: 14px;
            }
            .simple_link {
                padding: 12px 0;
                display: block;
                text-decoration: none;
                color: #1f2d3d;
                font-weight: 500;
                border-bottom: 1px solid #f1f3f8;
            }
        }