/* ========== RESET & 基础样式 ========== */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif;
            background-color: #ffffff;
            color: #1e2a3e;
            line-height: 1.5;
        }

        a {
            text-decoration: none;
            transition: all 0.25s ease;
        }

        ul, li {
            list-style: none;
        }

        /* ========== 头部整体容器 ========== */
        .site-header {
            width: 100%;
            background: #ffffff;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03), 0 1px 2px rgba(0, 0, 0, 0.05);
            border-bottom: 1px solid #eef2f6;
        }

        /* 内容区域居中，固定最大宽度，桌面留白 */
        .header-container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 32px;
        }

        /* ----- 第一行：语言切换（右侧）----- */
        .header-row-top {
            display: flex;
            justify-content: flex-end;
            align-items: center;
            padding-top: 5px;
            border-bottom: 1px solid #f0f2f5;
            background-color: #fafbfc;
        }

        .language-switcher {
            font-size: 14px;
            font-weight: 500;
        }

        .language-switcher a {
            color: #2c5f8a;
            margin: 0 4px;
            letter-spacing: 0.3px;
            padding: 4px 6px;
            border-radius: 20px;
            transition: all 0.2s;
        }

        .language-switcher a:first-child {
            margin-left: 0;
        }

        .language-switcher a:hover {
            color: #1d4e74;
            background-color: #e9ecef;
        }

        .language-switcher span {
            color: #bdc4cc;
            margin: 0 2px;
        }

        /* ----- 第二行：Logo + 品牌信息 (左) 与 导航菜单 (右) ----- */
        .header-row-main {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0 16px;
            gap: 20px;
        }

        /* 左侧品牌区域：logo + 品牌信息容器（纵向） */
        .brand-area {
            display: flex;
            align-items: center;
            gap: 14px;
            flex-shrink: 0;
        }

        .logo {
            display: inline-flex;
            align-items: center;
            line-height: 1;
        }

        .logo img {
            display: block;
            max-height: 52px;
            width: auto;
            transition: transform 0.2s;
        }

        /* 品牌信息容器：公司名称行 + 主营业务描述 */
        .brand-info {
            display: flex;
            flex-direction: column;
            justify-content: center;
            padding-left: 5px;
            border-left: 2px solid #cbdde9;
        }

        /* 公司名称与附加文字的行（水平排列） */
        .company-title-row {
            display: flex;
            align-items: baseline;
            gap: 12px;
            margin-bottom: 4px;
        }

        /* 公司名称核心文字：20px 加粗渐变 */
        .company-name-text {
            font-size: 18px;
            font-weight: bolder;
            letter-spacing: 0.1px;
            background: linear-gradient(135deg, #1e4668 0%, #2b5a84 100%);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            line-height: 1.2;
        }

        /* 主营业务描述：15px */
        .company-specialty {
            font-size: 15px;
            color: #4a627a;
            line-height: 1.4;
            letter-spacing: 0.3px;
            margin-top: 2px;
            font-weight: 500;
        }

        /* 右侧导航菜单区域 */
        .menu {
            flex-shrink: 0;
        }

        /* 水平导航栏 */
        .x-menu {
            display: flex;
            flex-wrap: wrap;
            justify-content: flex-end;
            align-items: center;
            gap: 8px;
        }

        .x-menu > li {
            position: relative;
            list-style: none;
        }

        /* 导航链接字体 20px，桌面端固定 */
        .x-menu > li > a {
            display: inline-block;
            padding: 8px 16px;
            font-size: 20px;
            font-weight: bold;
            color: #1f3b4c;
            border-radius: 40px;
            background: transparent;
            transition: all 0.2s;
            white-space: nowrap;
        }

        .x-menu > li > a:hover {
            background: #eef3fc;
            color: #0a5b8c;
        }

        /* 下拉菜单 (子菜单) 样式 */
        .x-sub-menu {
            position: absolute;
            top: calc(100% + 8px);
            left: 0;
            min-width: 200px;
            background: #ffffff;
            border-radius: 16px;
            box-shadow: 0 12px 28px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.02);
            padding: 10px 0;
            opacity: 0;
            visibility: hidden;
            transform: translateY(-8px);
            transition: all 0.2s cubic-bezier(0.2, 0.9, 0.4, 1.1);
            z-index: 100;
            border: 1px solid #eef2f8;
        }

        .x-menu > li:hover .x-sub-menu {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        .x-sub-menu li {
            display: block;
        }

        .x-sub-menu li a {
            display: block;
            padding: 8px 20px;
            font-size: 0.9rem;
            color: #2c5a74;
            font-weight: 500;
            transition: background 0.2s;
        }

        .x-sub-menu li a:hover {
            background: #f5f9ff;
            color: #0f5b8c;
            padding-left: 24px;
        }

        /* 针对特殊Message链接 (弹窗样式) */
        .x-menu li a[onclick*="window.open"] {
            background: #eef2fa;
            border-radius: 32px;
        }
        .x-menu li a[onclick*="window.open"]:hover {
            background: #e3e9f2;
            color: #004e7c;
        }

        /* ----- 第三行：装饰分隔 / 微元素 ----- */
        .header-row-bottom {
            padding: 0;
            background: #ffffff;
            border-top: 1px solid #eef2f8;
            margin-top: 0;
            display: flex;
            align-items: center;
            justify-content: flex-end;
        }
        .bottom-decoration {
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, #dceaf5 0%, #b9d3f0 40%, #dceaf5 100%);
            border-radius: 2px 2px 0 0;
        }

        /* 辅助清除浮动类（保留兼容） */
        .fl, .fr {
            float: none;
        }
        .clearfix::after {
            content: "";
            clear: both;
            display: table;
        }
        .language-switcher a + span {
            margin: 0 2px;
        }