:root {
            --primary: #0f253f; /* 主品牌色 - 深蓝 */
            --primary-dark: #1b5e20; 
            --secondary: #1a3a5f; /* 辅助色 - 深青蓝 */
            --accent: #ffa000; /* 强调色 - 活力橙 */
            --light: #f5f7fa; /* 浅背景色 */
            --dark: #263238; /* 深文本色 */
            --gray: #546e7a; /* 次文本色 */
            --light-gray: #cfd8dc; /* 边框/分隔线色 */
            --white: #ffffff; /* 白色 */
            --card-shadow: 0 8px 30px rgba(0, 0, 0, 0.08); /* 卡片阴影 */
            --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1); /* 过渡动画 */
            --platform-color: #e74c3c; /* 平台链接色 - 红色 */
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Helvetica Neue', Arial, sans-serif;
        }
        
        body {
            color: #333;
            line-height: 1.6;
            background-color: #f9f9f9;
        }
        
        /* 顶部导航栏 */
        .top-nav {
            background: #0f253f;
            color: white;
            padding: 5px 5%;
            display: flex;
            justify-content: flex-end; /* 改为右对齐 */
            align-items: center;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 2000;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            height: 40px; /* 新增固定高度 */
        }
        
        .top-nav-left, .top-nav-right {
            display: flex;
            align-items: center;
        }
        
        .top-nav-item {
            margin-right: 25px;
            position: relative;
            font-size: 12px;
        }
        
        .top-nav-item:last-child {
            margin-right: 0;
        }
        
        .top-nav-item a, .top-nav-item button {
            color: #ccc;
            text-decoration: none;
            background: none;
            border: none;
            cursor: pointer;
            transition: color 0.3s;
            font-size: 12px;
            display: flex;
            align-items: center;
        }
        
        .top-nav-item a:hover, .top-nav-item button:hover {
            color: white;
        }
        
        .top-nav-item i {
            margin-right: 5px;
        }
        
        .top-nav-dropdown {
            position: absolute;
            top: 100%;
            left: 0;
            background: white;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            min-width: 180px;
            display: none;
            z-index: 100;
            border-top: 3px solid #e31e24;
            border-radius: 0 0 4px 4px;
        }
        
        .top-nav-dropdown a {
            display: block;
            padding: 12px 15px;
            color: #555;
            text-decoration: none;
            border-bottom: 1px solid #f0f0f0;
            transition: all 0.3s;
            font-size: 14px;
        }
        
        .top-nav-dropdown a:hover {
            background: #f9f9f9;
            color: #e31e24;
        }
        
        .top-nav-item:hover .top-nav-dropdown {
            display: block;
        }
        
        /* 社交分享下拉菜单 */
        .social-share-dropdown {
            position: absolute;
            top: 100%;
            right: 1;
            background: white;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            min-width: 180px;
            display: none;
            z-index: 100;
            border-top: 3px solid #e31e24;
            border-radius: 0 0 4px 4px;
        }
        
        .social-share-dropdown a {
            display: block;
            padding: 12px 15px;
            color: #555;
            text-decoration: none;
            border-bottom: 1px solid #f0f0f0;
            transition: all 0.3s;
            font-size: 14px;
            display: flex;
            align-items: center;
        }
        
        .social-share-dropdown a i {
            margin-right: 10px;
            width: 16px;
            text-align: center;
        }
        
        .social-share-dropdown a:hover {
            background: #f9f9f9;
            color: #e31e24;
        }
        
        .top-nav-item:hover .social-share-dropdown {
            display: block;
        }
        
        /* 主头部导航 */
        header {
            background: #fff;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 40px; /* 调整为与顶部导航栏高度一致 */
            z-index: 1000;
        }
        
        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 5%;
            max-width: 1400px;
            margin: 0 auto;
            height: 70px; /* 新增固定高度 */
        }
        
        .logo {
            display: flex;
            align-items: center;
        }
        
        .logo img {
            height: 50px;
        }
        
        .logo h1 {
            font-size: 24px;
            margin-left: 10px;
            color: #1a3a5f;
            font-weight: 600;
        }
        
        /* 重新设计汉堡菜单 */
        .hamburger {
            display: none;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            width: 44px;
            height: 44px;
            background: transparent;
            border: none;
            cursor: pointer;
            padding: 0;
            position: relative;
            z-index: 1002;
        }
        
        .hamburger span {
            width: 24px;
            height: 2px;
            background: #1a3a5f;
            border-radius: 2px;
            transition: all 0.3s;
            margin: 3px 0;
            display: block;
        }
        
        /* 汉堡菜单激活状态 */
        .hamburger.active span:nth-child(1) {
            transform: translateY(8px) rotate(45deg);
        }
        
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        
        .hamburger.active span:nth-child(3) {
            transform: translateY(-8px) rotate(-45deg);
        }
        
        nav ul {
            display: flex;
            list-style: none;
        }
        
        nav ul li {
            position: relative;
            margin: 0 10px;
        }
        
        nav ul li a {
            text-decoration: none;
            color: #1a3a5f;
            font-weight: 500;
            font-size: 16px;
            padding: 10px 0;
            transition: color 0.3s;
            display: flex;
            align-items: center;
        }
        
        nav ul li a:hover {
            color: #e31e24;
        }
        
        /* 添加下拉箭头 */
        nav ul li.has-dropdown > a::after {
            content: "\f078";
            font-family: "Font Awesome 6 Free";
            font-weight: 900;
            font-size: 12px;
            margin-left: 6px;
            transition: transform 0.3s;
        }
        
        nav ul li.has-dropdown:hover > a::after {
            transform: rotate(180deg);
        }
        
        /* 美化导航标签 - 添加背景和圆角 */
        nav ul li a {
            padding: 10px 15px;
            border-radius: 6px;
            transition: all 0.3s;
        }
        
        nav ul li a:hover {
            background-color: #f5f7fa;
        }
        
        .dropdown {
            position: absolute;
            top: 100%;
            left: 0;
            background: white;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            min-width: 220px;
            display: none;
            z-index: 100;
            border-top: 3px solid #e31e24;
            border-radius: 0 0 4px 4px;
            transition: opacity 0.3s, visibility 0.3s;
            opacity: 0;
            visibility: hidden;
        }
        
        nav ul li:hover .dropdown {
            display: block;
            opacity: 1;
            visibility: visible;
        }
        
        /* 添加延迟消失效果 */
        nav ul li:not(:hover) .dropdown {
            transition-delay: 0.5s;
        }
        
        .dropdown a {
            display: block;
            padding: 12px 20px;
            border-bottom: 1px solid #f0f0f0;
            color: #555;
            font-weight: 400;
            transition: all 0.3s;
            font-size: 14px;
            border-radius: 0;
        }
        
        .dropdown a:hover {
            background: #f9f9f9;
            color: #e31e24;
            padding-left: 21px;
        }
        
        .nav-icons {
            display: flex;
            align-items: center;
            position: relative;
        }
        
        .nav-icons i {
            margin-left: 20px;
            font-size: 22px;
            color: #1a3a5f;
            cursor: pointer;
            transition: color 0.3s;
        }
        
        .nav-icons i:hover {
            color: #e31e24;
        }
        
        /* 语言选择器样式 */
        .language-selector {
            position: relative;
            display: inline-block;
        }
        
        .language-dropdown {
            position: absolute;
            top: 100%;
            right: 0;
            background: white;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            min-width: 120px;
            display: none;
            z-index: 100;
            border-top: 3px solid #e31e24;
        }
        
        .language-dropdown a {
            display: block;
            padding: 10px 15px;
            color: #333;
            text-decoration: none;
            border-bottom: 1px solid #f0f0f0;
        }
        
        .language-dropdown a:hover {
            background: #f9f9f9;
            color: #e31e24;
        }
        
        .language-selector.active .language-dropdown {
            display: block;
        }

        .main-hero {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: var(--white);
            padding: 50px 20px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        
        .main-hero::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('https://images.unsplash.com/photo-1501004318641-b39e6451bec6?ixlib=rb-1.2.1&auto=format&fit=crop&w=1350&q=80') no-repeat center center;
            background-size: cover;
            opacity: 0.15;
            z-index: 1;
        }
        
        .main-hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
            margin: 0 auto;
        }
        
        .main-hero h1 {
            font-size: 3.5rem;
            margin: 1.5rem 0;
            color: var(--white);
            text-shadow: 0 2px 10px rgba(0,0,0,0.3);
        }
        
        .main-hero p {
            font-size: 1.3rem;
            margin-bottom: 10px;
            line-height: 1.7;
            opacity: 0.9;
        }
        
        .btn {
            display: inline-block;
            background: #e31e24;
            color: white;
            padding: 12px 30px;
            text-decoration: none;
            border-radius: 4px;
            font-weight: 500;
            transition: background 0.3s;
        }
        
        .btn:hover {
            background: #c11a20;
        }
        
        .read-more {
            color: #e31e24;
            text-decoration: none;
            font-weight: 500;
            display: inline-flex;
            align-items: center;
            transition: all 0.3s;
            position: relative;
            z-index: 2;
        }

        /* 底部 */
        footer {
            background: #1a3a5f;
            color: white;
            padding: 60px 0 0;
        }
        
        .footer-content {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 5%;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
        }
        
        .footer-column h3 {
            font-size: 18px;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 10px;
            display: inline-block;
        }
        
        .footer-column h3:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background: #e31e24;
        }
        
        .footer-column ul {
            list-style: none;
        }
        
        .footer-column ul li {
            margin-bottom: 12px;
            display: flex;
            align-items: center;
        }
        
        .footer-column ul li i {
            margin-right: 10px;
            width: 16px;
            text-align: center;
        }
        
        .footer-column a {
            color: #ccc;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-column a:hover {
            color: white;
        }
        
        .social-links {
            display: flex;
            margin-top: 20px;
            flex-wrap: wrap;
        }
        
        .social-links a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.1);
            margin-right: 10px;
            margin-bottom: 10px;
            transition: background 0.3s;
            color: white;
            text-decoration: none;
            position: relative;
        }
        
        .social-links a:hover {
            background: #e31e24;
        }
        
        .footer-bottom {
            background: #0f253f;
            padding: 20px 5%;
            margin-top: 60px;
            text-align: center;
            font-size: 14px;
            color: #999;
        }
        
        /* 弹窗 */
        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.7);
            z-index: 2000;
            justify-content: center;
            align-items: center;
        }
        
        .modal-content {
            background: white;
            padding: 30px;
            border-radius: 8px;
            width: 90%;
            max-width: 500px;
            position: relative;
        }
        
        .close-modal {
            position: absolute;
            top: 15px;
            right: 15px;
            font-size: 24px;
            cursor: pointer;
            color: #999;
        }
        
        .modal-title {
            margin-bottom: 20px;
            color: #1a3a5f;
        }
        
        .search-input {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 16px;
            margin-bottom: 20px;
        }
        
        .languages {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
            gap: 10px;
        }
        
        .language {
            padding: 8px 12px;
            background: #f5f5f5;
            border-radius: 4px;
            text-align: center;
            cursor: pointer;
            transition: background 0.3s;
        }
        
        .language:hover {
            background: #e9e9e9;
        }
        
        /* 回到顶部按钮 */
        .back-to-top {
            position: fixed;
            bottom: 20px;
            right: 20px;
            width: 40px;
            height: 40px;
            background: #e31e24;
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
            z-index: 999;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
            /* 修改：设置为半透明 */
            opacity: 0.7;
        }
        
        .back-to-top.visible {
            opacity: 0.8;
            visibility: visible;
        }
        
        .back-to-top:hover {
            background: #c11a20;
            /* 修改：鼠标悬停时不透明 */
            opacity: 1;
        }
        
        /* 社交媒体弹窗 */
        .social-modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.7);
            z-index: 2000;
            justify-content: center;
            align-items: center;
        }
        
        .social-modal-content {
            background: white;
            padding: 30px;
            border-radius: 8px;
            width: 90%;
            max-width: 400px;
            position: relative;
            text-align: center;
        }
        
        .social-modal-content .close-modal {
            position: absolute;
            top: 15px;
            right: 15px;
            font-size: 24px;
            cursor: pointer;
            color: #999;
        }
        
        .social-modal-content h3 {
            color: #1a3a5f;
            margin-bottom: 20px;
        }
        
        .social-modal-content p {
            color: #666;
            margin-bottom: 20px;
            line-height: 1.6;
        }
        
        .qrcode {
            width: 180px;
            height: 180px;
            margin: 0 auto 20px;
            background: #f5f5f5;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 8px;
        }
        
        .qrcode i {
            font-size: 60px;
            color: #ccc;
        }
        
        /* 留言弹窗 */
        .message-modal-content {
            background: white;
            padding: 30px;
            border-radius: 8px;
            width: 90%;
            max-width: 500px;
            position: relative;
        }
        
        .message-form textarea {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 16px;
            margin-bottom: 20px;
            min-height: 150px;
            resize: vertical;
        }
        
        /* 员工验证弹窗 */
        .verify-modal-content {
            background: white;
            padding: 30px;
            border-radius: 8px;
            width: 90%;
            max-width: 500px;
            position: relative;
        }
        
        .verify-form input {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 16px;
            margin-bottom: 20px;
        }
        
        /* 验证码相关样式 */
        .captcha-container {
            display: flex;
            align-items: center;
            margin-bottom: 20px;
        }
        
        .captcha-input {
            flex: 1;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 16px;
            margin-right: 10px;
        }
        
        .captcha-img {
            width: 100px;
            height: 40px;
            background: #f5f5f5;
            border: 1px solid #ddd;
            border-radius: 4px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: 'Courier New', monospace;
            font-size: 20px;
            font-weight: bold;
            letter-spacing: 2px;
            cursor: pointer;
            user-select: none;
            margin-top: -20px;
        }
        
        .refresh-captcha {
            margin-left: 10px;
            color: #1a3a5f;
            cursor: pointer;
            font-size: 18px;
            margin-top: -20px;
        }
        
        .refresh-captcha:hover {
            color: #e31e24;
        }
        
        /* 移动端导航关闭按钮 */
        .nav-close {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 20px;
            background: #fff;
            z-index: 1002;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            justify-content: flex-start;
            align-items: center;
            padding-left: 20px;
        }
        
        .nav-close i {
            font-size: 24px;
            color: #1a3a5f;
        }
        
        /* 移动端导航遮罩层 */
        .nav-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 999;
        }
        
        /* 移动端菜单激活时显示遮罩层 */
        body.nav-active .nav-overlay {
            display: block;
        }
        
        /* 移动端菜单激活时显示关闭按钮 */
        body.nav-active .nav-close {
            display: flex;
        }
        
        /* 移动端响应式设计 */
        @media (max-width: 1024px) {
            nav ul li {
                margin: 0 12px;
            }
        }
        
        @media (max-width: 900px) {
            /* 修改：不再隐藏顶部导航栏 */
            .top-nav {
                display: flex;
                position: relative;
                padding: 10px 5%;
                box-shadow: none;
                justify-content: flex-end; /* 确保靠右 */
                height: auto;
                position: fixed;
                top: 0;
            }
            
            .top-nav-item {
                margin-right: 15px; /* 增加间距 */
            }
            
            .top-nav-item:last-child {
                margin-right: 0;
            }
            
            body {
                padding-top: 0;
            }
            
            header {
                top: 40px;
            }
            
            .nav-container {
                position: relative;
                padding: 15px 5%;
                height: 70px;
            }
            
            .hamburger {
                display: flex;
                position: absolute;
                left: 5%;
            }
            
            .logo {
                position: absolute;
                left: 50%;
                transform: translateX(-50%);
                top: 15%;
            }
            
            nav {
                position: fixed;
                top: 0;
                left: -100%;
                width: 280px;
                height: 100vh;
                background: white;
                box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
                transition: left 0.3s;
                z-index: 1001;
                overflow-y: auto;
                padding-top: 70px;
            }
            
            body.nav-active nav {
                left: 0;
            }
            
            nav ul {
                flex-direction: column;
                padding: 20px 30px 30px;
            }
            
            nav ul li {
                margin: 0;
                width: 100%;
            }
            
            nav ul li a {
                padding: 15px 0;
                border-bottom: 1px solid #f0f0f0;
                display: flex;
                justify-content: space-between;
                border-radius: 0;
                font-size: 16px;
            }
            
            /* 移动端保留下拉箭头 */
            nav ul li a i.fa-chevron-down {
                display: block !important;
            }
            
            .dropdown {
                position: static;
                width: 100%;
                box-shadow: none;
                border: none;
                display: none;
                margin: 10px 0;
                opacity: 1;
                visibility: visible;
                transition: none;
                padding-left: 15px;
            }
            
            nav ul li.active .dropdown {
                display: block;
            }
            
            .slide-content h2 {
                font-size: 36px;
            }
            
            .slide-content p {
                font-size: 18px;
            }
        
            .main-hero h1 {
                font-size: 2rem;
            }
        
            .main-hero p {
                font-size: 1rem;
            }
            
            .news-cards, .business-grid, .esg-grid {
                grid-template-columns: 1fr;
            }
            
            .footer-content {
                grid-template-columns: 1fr;
            }
            
            /* 确保移动端nav-icons可见 */
            .nav-icons {
                display: flex;
                position: absolute;
                right: 5%;
            }
            
            /* 隐藏语言下拉菜单 */
            .language-dropdown {
                display: none !important;
            }
            
            /* 移动端顶部导航栏样式调整 */
            .top-nav {
                flex-wrap: wrap;
                justify-content: flex-end; /* 确保靠右 */
                padding: 8px 5%;
            }
            
            .top-nav-item {
                margin: 5px 10px;
                font-size: 12px;
            }
            
            /* 移动端社交分享下拉菜单样式 */
            .social-share-dropdown {
                right: auto;
                left: 50%;
                transform: translateX(-50%);
                min-width: 160px;
            }
            
            /* 移动端隐藏左右箭头 */
            .slider-arrows {
                display: none;
            }
        }
        
        @media (max-width: 600px) {
            .logo h1 {
                font-size: 20px;
            }
            
            .logo img {
                height: 35px;
                margin: 8px 0;
            }
            
            .slide-content h2 {
                font-size: 28px;
            }
            
            .slide-content p {
                font-size: 16px;
            }
            
            .hero-slider {
                height: 500px;
            }
            
            .section-title h2 {
                font-size: 28px;
            }
            
            .news-tabs {
                overflow-x: auto;
                justify-content: flex-start;
            }
            
            .tab-btn {
                padding: 12px 14px;
                white-space: nowrap;
            }
            
            /* 移动端顶部导航栏进一步调整 */
            .top-nav {
                padding: 8px 3%;
            }
            
            .top-nav-item {
                margin: 5px 8px; /* 增加间距 */
                font-size: 11px;
            }
            
            .top-nav-item i {
                margin-right: 3px;
                font-size: 12px;
            }
        }