/* === Header 现代化风格 === */
        #header {
            box-shadow: 0 1px 8px rgba(0,0,0,0.06);
            background: #fff;
        }

        /* 顶部公告条 */
        #header-top-bar {
            background: linear-gradient(90deg, #1a1a2e 0%, #16213e 100%) !important;
            padding: 0 !important;
            border-bottom: none;
        }
        #header-top-bar .row {
            color: #c8d6e5 !important;
            justify-content: center !important;
            padding: 8px 60px !important;
            font-size: 13px;
        }
        #header-top-bar .row a[href="/register"] {
            background: linear-gradient(135deg, #ee5a24, #f79f1f) !important;
            color: #fff !important;
            border-radius: 4px !important;
            padding: 4px 14px !important;
            margin-left: 6px !important;
            font-size: 13px;
            font-weight: 500;
            transition: all 0.25s ease;
            border: none;
        }
        #header-top-bar .row a[href="/register"]:hover {
            opacity: 0.88;
            transform: translateY(-1px);
        }

        /* 主导航容器 */
        #logoAndNav {
            border-bottom: 1px solid #f0f0f0 !important;
            background: #fff !important;
            height: 75px;
            display: flex;
            align-items: center;
        }
        #logoAndNav .container {
            padding: 0 20px;
        }
        .js-mega-menu {
            padding: 0 !important;
            height: 75px;
            display: flex;
            align-items: center;
        }

        /* Logo */
        #logoAndNav img {
            padding-top: 0 !important;
            width: 180px !important;
            transition: opacity 0.2s;
        }
        #logoAndNav img:hover {
            opacity: 0.85;
        }

        /* 导航栏切换按钮(移动端) */
        .navbar-toggler {
            border: none !important;
            padding: 8px 12px !important;
            outline: none !important;
        }
        .navbar-toggler:focus {
            box-shadow: none !important;
        }

        /* 导航列表 */
        .navbar-nav.main-navbar-nav {
            align-items: center;
            gap: 2px;
        }
        .navbar-nav .nav-item.custom-nav-item {
            position: relative;
        }
        .navbar-nav .nav-link.custom-nav-link {
            font-size: 14px !important;
            font-weight: 500 !important;
            color: #333 !important;
            padding: 8px 16px !important;
            border-radius: 4px;
            transition: all 0.2s ease;
            line-height: 1.5;
        }
        .navbar-nav .nav-link.custom-nav-link:hover {
            color: #006eff !important;
            background: rgba(0,110,255,0.06);
        }

        /* 最新活动标签 */
        .navbar-nav .nav-link.custom-nav-link[href="/activity.html"] {
            color: #ff4757 !important;
            font-weight: 600 !important;
        }
        .navbar-nav .nav-link.custom-nav-link[href="/activity.html"] i {
            background: #ff4757 !important;
            box-shadow: none !important;
            border-radius: 3px !important;
            padding: 1px 4px !important;
            font-size: 9px !important;
            font-weight: bold;
        }
        .navbar-nav .nav-link.custom-nav-link[href="/activity.html"]:hover {
            background: rgba(255,71,87,0.06);
        }

        /* 下拉箭头 */
        .dropdown-toggle::after {
            border: none !important;
            content: '\e62a' !important;
            font-family: 'themify' !important;
            font-size: 10px;
            margin-left: 4px;
            vertical-align: middle;
            transition: transform 0.2s;
        }
        .nav-item.show .dropdown-toggle::after {
            transform: rotate(180deg);
        }

        /* 下拉菜单 */
        .dropdown-menu.gt,
        .navbar-nav .dropdown-menu {
            border: none !important;
            border-radius: 12px !important;
            box-shadow: 0 12px 40px rgba(0,0,0,0.12) !important;
            padding: 20px 24px !important;
            margin-top: 0 !important;
            animation: fadeInDown 0.2s ease;
        }
        @keyframes fadeInDown {
            from { opacity: 0; transform: translateY(-8px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* === 订购产品 Mega Menu 多列布局 === */
        .dropdown-menu.gt {
            min-width: 720px !important;
            column-count: 3;
            column-gap: 32px;
            column-fill: balance;
            max-height: none !important;
            overflow: visible !important;
        }
        .dropdown-menu.gt > * {
            break-inside: avoid;
            page-break-inside: avoid;
        }

        /* 悬浮展示下拉菜单（桌面端） */
        @media (min-width: 768px) {
            .navbar-nav .nav-item.hs-has-sub-menu:hover > .dropdown-menu,
            .navbar-nav .nav-item.dropdown:hover > .dropdown-menu {
                display: block !important;
                opacity: 1 !important;
                visibility: visible !important;
                transform: translateY(0) !important;
            }
            .navbar-nav .nav-item.hs-has-sub-menu > .dropdown-menu,
            .navbar-nav .nav-item.dropdown > .dropdown-menu {
                display: none !important;
                opacity: 0 !important;
                visibility: hidden !important;
                transform: translateY(8px) !important;
                transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease !important;
            }
            /* 一级菜单悬浮时的样式 */
            .navbar-nav .nav-item.hs-has-sub-menu:hover > .nav-link.custom-nav-link {
                color: #006eff !important;
                background: rgba(0,110,255,0.06);
            }
            .navbar-nav .nav-item.hs-has-sub-menu:hover > .dropdown-toggle::after {
                transform: rotate(180deg);
            }
        }

        /* 产品分组标题 - 与整站统一 */
        .dropdown-menu .dropdown-item[style*="background-color"] {
            background-color: #f5f7fa !important;
            border-radius: 6px !important;
            margin: 0 0 8px 0 !important;
            padding: 6px 12px !important;
        }
        .dropdown-menu .dropdown-item[style*="background-color"] li {
            font-size: 13px !important;
            font-weight: 600 !important;
            color: #4e5969 !important;
            list-style: none;
        }

        /* 产品项 - 与整站普通下拉项风格统一 */
        .dropdown-menu .product-name {
            font-size: 14px !important;
            margin: 0 !important;
        }
        .dropdown-menu .product-name a.dropdown-item {
            padding: 8px 16px !important;
            border-radius: 6px;
            margin: 0 8px !important;
            max-width: calc(100% - 16px) !important;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            box-sizing: border-box;
            color: #333 !important;
            border-left: 3px solid transparent;
        }
        .dropdown-menu .product-name a.dropdown-item:hover {
            background: #f0f5ff !important;
            color: #006eff !important;
            border-left-color: #006eff;
            padding-left: 13px !important;
        }
        .dropdown-menu .product-name img {
            width: 22px !important;
            height: 16px !important;
            max-width: 22px !important;
            max-height: 16px !important;
            border: 1px solid #e5e6eb !important;
            border-radius: 2px !important;
            object-fit: cover;
            margin-right: 8px !important;
            flex-shrink: 0;
            display: inline-block !important;
        }
        .dropdown-menu .product-name .product-tag {
            background: #00a870 !important;
            border-radius: 4px !important;
            font-size: 11px !important;
            padding: 2px 6px !important;
            color: #fff;
            white-space: nowrap;
            margin-left: 8px !important;
        }

        /* 分隔线隐藏 */
        .dropdown-menu .dropdown-divider {
            display: none !important;
        }

        /* 普通下拉项 - 统一基准样式 */
        .navbar-nav .dropdown-menu .dropdown-item {
            font-size: 14px !important;
            padding: 8px 16px !important;
            color: #333 !important;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            border-radius: 6px;
            margin: 0 8px;
            box-sizing: border-box;
            max-width: calc(100% - 16px);
            border-left: 3px solid transparent;
        }
        .navbar-nav .dropdown-menu .dropdown-item:hover {
            background: #f0f5ff !important;
            color: #006eff !important;
            border-left-color: #006eff;
            padding-left: 13px !important;
        }

        /* 登录/用户中心按钮 - 桌面端 */
        .navbar-nav .nav-item.dl {
            background: linear-gradient(135deg, #006eff, #00a4ff) !important;
            border-radius: 6px !important;
            margin-left: 12px !important;
            transition: all 0.25s ease;
            box-shadow: 0 2px 8px rgba(0,110,255,0.25);
        }
        .navbar-nav .nav-item.dl:hover {
            box-shadow: 0 4px 14px rgba(0,110,255,0.35);
            transform: translateY(-1px);
        }
        .navbar-nav .nav-item.dl .nav-link {
            color: #fff !important;
            font-size: 13px !important;
            font-weight: 500 !important;
            padding: 8px 18px !important;
            white-space: nowrap;
        }

        /* ============================================================
           响应式 - 手机端：全宽下拉菜单
           ============================================================ */
        @media (max-width: 767px) {
            /* 头部容器 */
            #logoAndNav {
                height: 60px;
                padding: 0;
                border-bottom: 1px solid #f0f0f0 !important;
                margin-bottom: 0;
            }
            #logoAndNav .container {
                padding: 0 16px;
                width: 100%;
                max-width: 100%;
            }
            .js-mega-menu {
                height: 60px;
                flex-wrap: nowrap;
                padding: 0;
            }

            /* Logo */
            #logoAndNav img {
                width: 150px !important;
            }

            /* 汉堡按钮 */
            .navbar-toggler {
                padding: 6px 8px !important;
                margin-left: auto;
            }

            /* === 菜单面板 === */
            #navBar {
                position: fixed;
                top: 60px;
                left: 0;
                right: 0;
                width: 100%;
                max-height: calc(100vh - 60px);
                overflow-y: auto;
                background: #fff;
                border-top: 1px solid #f0f0f0;
                border-bottom: 1px solid #f0f0f0;
                box-shadow: 0 4px 16px rgba(0,0,0,0.08);
                padding: 0 !important;
                margin: 0 !important;
                z-index: 1050;
                transform: translateY(-10px);
                opacity: 0;
                transition: transform 0.25s ease, opacity 0.25s ease;
                pointer-events: none;
            }
            #navBar.show {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            #navBar.navbar-collapse {
                padding: 0 !important;
                margin: 0 !important;
                border: none;
            }

            /* 导航列表 */
            .navbar-nav.main-navbar-nav {
                gap: 0;
                width: 100%;
                padding: 0 !important;
                margin: 0 !important;
                flex-direction: column;
                align-items: stretch;
            }

            /* 一级菜单项 */
            .navbar-nav .nav-item.custom-nav-item {
                width: 100%;
                margin: 0;
            }
            .navbar-nav .nav-link.custom-nav-link {
                padding: 14px 20px !important;
                border-radius: 0;
                font-size: 15px !important;
                display: flex;
                align-items: center;
                justify-content: space-between;
                border-bottom: 1px solid #f5f5f5;
                color: #333 !important;
            }
            .navbar-nav .nav-link.custom-nav-link:hover,
            .navbar-nav .nav-link.custom-nav-link:active {
                background: #f8f9fa;
                color: #006eff !important;
            }
            .navbar-nav .nav-link.custom-nav-link[href="/activity.html"] {
                border-bottom: 1px solid #f5f5f5;
                color: #ff4757 !important;
            }

            /* 下拉箭头 */
            .dropdown-toggle::after {
                float: none;
                margin: 0;
                font-size: 10px;
                color: #999;
            }
            .nav-item.show .dropdown-toggle::after {
                transform: rotate(180deg);
            }

            /* 移动端下拉菜单 - 内嵌展开，单列上下排列 */
            .navbar-nav .dropdown-menu,
            .dropdown-menu.gt {
                position: static !important;
                float: none;
                width: 100% !important;
                max-width: 100% !important;
                min-width: 0 !important;
                box-shadow: none !important;
                border: none !important;
                border-radius: 0 !important;
                padding: 8px 12px !important;
                margin: 0 !important;
                background: #f5f7fa;
                animation: none;
                column-count: 1 !important;
            }
            .dropdown-menu.gt {
                max-height: none !important;
                overflow: visible !important;
            }

            /* 统一所有下拉项风格（含订购产品）- 现代卡片式 */
            .navbar-nav .dropdown-menu .dropdown-item,
            .dropdown-menu .product-name a.dropdown-item {
                margin: 0 0 6px 0 !important;
                border-radius: 8px !important;
                max-width: 100% !important;
                padding: 12px 16px !important;
                font-size: 14px !important;
                border: 1px solid #e5e6eb;
                color: #1d2129 !important;
                background: #fff !important;
                display: flex;
                align-items: center;
                justify-content: space-between;
                transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
                box-shadow: 0 1px 3px rgba(0,0,0,0.04);
            }
            .navbar-nav .dropdown-menu .dropdown-item:last-child,
            .dropdown-menu .product-name:last-child a.dropdown-item {
                margin-bottom: 0 !important;
            }
            .navbar-nav .dropdown-menu .dropdown-item:hover,
            .dropdown-menu .product-name a.dropdown-item:hover {
                background: #f0f5ff !important;
                color: #006eff !important;
                border-color: #006eff;
                box-shadow: 0 2px 8px rgba(0,110,255,0.12);
                transform: translateX(2px);
            }

            /* 分组标题 - 与整站一致 */
            .dropdown-menu .dropdown-item[style*="background-color"] {
                margin: 12px 0 8px 0 !important;
                border-radius: 8px !important;
                padding: 8px 14px !important;
                background-color: #eef0f5 !important;
                border: none !important;
                box-shadow: none !important;
                color: #4e5969 !important;
            }
            .dropdown-menu .dropdown-item[style*="background-color"] li {
                font-size: 13px !important;
                font-weight: 600;
                color: #4e5969;
            }

            /* 标签 */
            .dropdown-menu .product-name .product-tag {
                background: #00a870 !important;
                border-radius: 4px !important;
                font-size: 11px !important;
                padding: 2px 6px !important;
                color: #fff;
                white-space: nowrap;
            }

            /* 国旗 */
            .dropdown-menu .product-name img {
                width: 22px !important;
                height: 16px !important;
                border: 1px solid #e5e6eb !important;
                border-radius: 2px !important;
                margin-right: 8px !important;
            }

            /* 分隔线隐藏 */
            .dropdown-menu .dropdown-divider {
                display: none !important;
            }

            /* 登录/注册按钮 */
            .navbar-nav .nav-item.dl {
                margin: 0 !important;
                width: 100% !important;
                border-radius: 0 !important;
                background: linear-gradient(135deg, #006eff, #00a4ff) !important;
                box-shadow: none !important;
                transform: none !important;
            }
            .navbar-nav .nav-item.dl .nav-link {
                text-align: center;
                padding: 16px 20px !important;
                font-size: 15px !important;
                font-weight: 600 !important;
                color: #fff !important;
                width: 100%;
                display: block;
                box-sizing: border-box;
            }
            .navbar-nav .nav-item.dl .nav-link:hover {
                background: transparent !important;
                opacity: 0.92;
            }

            /* 顶部公告栏隐藏 */
            #header-top-bar {
                display: none !important;
            }
        }

        /* 头部固定时的阴影 */
        .headroom--pinned {
            box-shadow: 0 2px 12px rgba(0,0,0,0.08);
        }
        .headroom--unpinned {
            box-shadow: none;
        }

        /* 保留原有覆盖样式 */
        @media (min-width: 768px){
            .gt {
                max-height: none !important; overflow: visible !important;
            }
        }
        .gt {
            max-height: none; overflow: visible;
        }
        @media (min-width: 768px){
            .dl {
                border-radius: 0px !important;
            }
        }
        .dl {
            border-radius: 5px;
        }
        @media (min-width: 768px){
            .hd {
                display: block !important;
            }
        }
        .hd {
            display: none;
        }

        /* === 移动端 Mega Menu 单列 === */
        @media (max-width: 767px) {
            .dropdown-menu.gt {
                column-count: 1 !important;
                min-width: auto !important;
                max-height: none !important;
                overflow: visible !important;
            }
        }