:root {
            --primary: #2563eb;
            --primary-light: #3b82f6;
            --secondary: #10b981;
            --dark: #111827;
            --light: #f9fafb;
            --text: #1f2937;
            --text-light: #6b7280;
            --white: #ffffff;
            --border: #e5e7eb;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
        }
        body {
            background-color: var(--light);
            color: var(--text);
            line-height: 1.6;
            overflow-x: hidden;
        }
        .container {
            width: 100%;
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 顶部导航 - 响应式改进 */
        .header {
            background-color: var(--white);
            box-shadow: 0 1px 3px rgba(0,0,0,0.05);
            padding: 15px 0;
            position: sticky;
            top: 0;
            z-index: 100;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .logo {
            display: flex;
            align-items: center;
            margin-right: 20px;
        }
        .logo-img {
            height: 36px;
            margin-right: 10px;
        }
        .logo-text {
            font-size: 20px;
            font-weight: 700;
            color: var(--dark);
            position: relative;
        }
        .logo-text::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
        }
        
        /* 移动端菜单按钮 */
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: var(--text);
            cursor: pointer;
        }
        
        .nav {
            display: flex;
            align-items: center;
            transition: all 0.3s ease;
        }
        .nav-list {
            display: flex;
            list-style: none;
            margin-right: 20px;
        }
        .nav-item {
            margin: 0 12px;
            position: relative;
        }
        .nav-link {
            color: var(--text);
            text-decoration: none;
            font-weight: 500;
            font-size: 15px;
            transition: all 0.3s;
            padding: 8px 0;
            white-space: nowrap;
        }
        .nav-link:hover {
            color: var(--primary);
        }
        .nav-link.active {
            color: var(--primary);
            font-weight: 600;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            border-radius: 3px;
        }
        .header-actions {
            display: flex;
            align-items: center;
        }
        
        /* 按钮样式 */
        .btn {
            display: inline-block;
            padding: 10px 20px;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 600;
            font-size: 14px;
            transition: all 0.3s;
            text-align: center;
            white-space: nowrap;
        }
        .btn-primary {
            background: linear-gradient(90deg, var(--primary), var(--primary-light));
            color: var(--white);
            box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
        }
        .btn-outline {
            border: 2px solid var(--primary);
            color: var(--primary);
            margin-left: 12px;
        }
        .btn-outline:hover {
            background-color: rgba(37, 99, 235, 0.05);
        }
        
        /* 英雄区域 - 响应式改进 */
        .hero {
            padding: 80px 0 60px;
            position: relative;
            overflow: hidden;
        }
        .hero-container {
            display: flex;
            flex-direction: column;
        }
        .hero-content {
            order: 1;
            text-align: center;
            margin-bottom: 40px;
        }
        .hero-title {
            font-size: 32px;
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 20px;
            color: var(--dark);
        }
        .hero-subtitle {
            font-size: 16px;
            color: var(--text-light);
            margin-bottom: 30px;
            max-width: 100%;
        }
        .hero-actions {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 15px;
            margin-bottom: 40px;
        }
        .hero-stats {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 20px;
        }
        .stat {
            display: flex;
            align-items: center;
            margin: 0 10px;
        }
        .stat-icon {
            width: 40px;
            height: 40px;
            border-radius: 10px;
            background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(16, 185, 129, 0.1));
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 10px;
            color: var(--primary);
            font-size: 18px;
        }
        .stat-content h3 {
            font-size: 22px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 5px;
        }
        .stat-content p {
            font-size: 12px;
            color: var(--text-light);
        }
        .hero-image {
            order: 2;
            margin: 0 auto;
            max-width: 100%;
        }
        .hero-image img {
            width: 100%;
            max-width: 500px;
            border-radius: 12px;
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        
        /* 平台特色 - 响应式改进 */
        .features {
            padding: 60px 0;
            background-color: var(--white);
        }
        .section-header {
            text-align: center;
            margin-bottom: 40px;
        }
        .section-title {
            font-size: 28px;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 15px;
        }
        .section-subtitle {
            font-size: 16px;
            color: var(--text-light);
            max-width: 100%;
            margin: 0 auto;
            padding: 0 20px;
        }
        .features-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }
        .feature-card {
            background: var(--light);
            border-radius: 12px;
            padding: 30px;
            transition: all 0.3s;
            border: 1px solid var(--border);
        }
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.08);
            border-color: transparent;
        }
        .feature-icon {
            width: 50px;
            height: 50px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: var(--white);
            font-size: 20px;
        }
        .feature-title {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 12px;
            color: var(--dark);
        }
        
        /* 交易产品 - 响应式改进 */
        .products {
            padding: 60px 0;
            background-color: var(--light);
        }
        .products-container {
            display: flex;
            flex-direction: column;
        }
        .products-content {
            order: 1;
            margin-bottom: 40px;
        }
        .product-list {
            list-style: none;
            margin-top: 30px;
        }
        .product-item {
            margin-bottom: 25px;
            display: flex;
            align-items: flex-start;
        }
        .product-icon {
            width: 45px;
            height: 45px;
            border-radius: 10px;
            background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(16, 185, 129, 0.1));
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 15px;
            color: var(--primary);
            font-size: 18px;
            flex-shrink: 0;
        }
        .product-content h3 {
            font-size: 18px;
            margin-bottom: 8px;
        }
        .product-content p {
            font-size: 14px;
            color: var(--text-light);
        }
        .products-image {
            order: 2;
            margin: 0 auto;
            max-width: 100%;
        }
        .products-image img {
            width: 100%;
            max-width: 500px;
            border-radius: 12px;
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        
        /* 安全保障 - 响应式改进 */
        .security {
            padding: 60px 0;
            background-color: var(--white);
        }
        .security-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
            margin-top: 40px;
        }
        .security-card {
            background: var(--light);
            border-radius: 12px;
            padding: 30px;
            transition: all 0.3s;
            border: 1px solid var(--border);
            text-align: center;
        }
        .security-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.08);
            border-color: transparent;
        }
        .security-icon {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(16, 185, 129, 0.1));
            color: var(--primary);
            font-size: 24px;
        }
        
        /* 底部 - 响应式改进 */
        .footer {
            background-color: var(--dark);
            color: var(--white);
            padding: 60px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand {
            margin-bottom: 30px;
            text-align: center;
        }
        .footer-logo {
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 15px;
        }
        .footer-logo img {
            height: 32px;
            margin-right: 10px;
        }
        .footer-logo-text {
            font-size: 20px;
            font-weight: 700;
            position: relative;
        }
        .footer-logo-text::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
        }
        .footer-about {
            color: rgba(255,255,255,0.7);
            font-size: 14px;
            line-height: 1.7;
            margin-bottom: 20px;
        }
        .footer-social {
            display: flex;
            justify-content: center;
            margin-bottom: 30px;
        }
        .social-link {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255,255,255,0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 8px;
            color: var(--white);
            transition: all 0.3s;
        }
        .social-link:hover {
            background: var(--primary);
            transform: translateY(-3px);
        }
        .footer-column {
            margin-bottom: 30px;
            text-align: center;
        }
        .footer-column h3 {
            font-size: 18px;
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 10px;
            color: var(--white);
            display: inline-block;
        }
        .footer-column h3::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: rgba(255,255,255,0.7);
            text-decoration: none;
            font-size: 14px;
            transition: color 0.3s;
        }
        .footer-links a:hover {
            color: var(--white);
        }
        .footer-bottom {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: rgba(255,255,255,0.5);
            font-size: 13px;
        }
        
        /* 平板设备样式 */
        @media (min-width: 768px) {
            .hero-title {
                font-size: 40px;
            }
            .hero-subtitle {
                font-size: 18px;
            }
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .security-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-column {
                text-align: left;
            }
            .footer-brand {
                text-align: left;
            }
            .footer-social {
                justify-content: flex-start;
            }
        }
        
        /* 桌面设备样式 */
        @media (min-width: 992px) {
            .hero {
                padding: 100px 0;
            }
            .hero-container {
                flex-direction: row;
                align-items: center;
                gap: 60px;
            }
            .hero-content {
                order: 1;
                text-align: left;
                flex: 1;
                margin-bottom: 0;
            }
            .hero-subtitle {
                max-width: 500px;
                margin-left: 0;
                margin-right: 0;
            }
            .hero-actions {
                justify-content: flex-start;
            }
            .hero-stats {
                justify-content: flex-start;
            }
            .hero-image {
                order: 2;
                flex: 1;
            }
            .features-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .security-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .products-container {
                flex-direction: row;
                align-items: center;
                gap: 60px;
            }
            .products-content {
                order: 1;
                flex: 1;
                margin-bottom: 0;
            }
            .products-image {
                order: 2;
                flex: 1;
            }
            .footer-grid {
                grid-template-columns: repeat(5, 1fr);
            }
        }
        
        /* 大桌面设备样式 */
        @media (min-width: 1200px) {
            .hero-title {
                font-size: 48px;
            }
            .section-title {
                font-size: 36px;
            }
        }
        
        /* 移动端菜单样式 */
        @media (max-width: 991px) {
            .mobile-menu-btn {
                display: block;
                order: 1;
            }
            .nav {
                display: none;
                width: 100%;
                order: 3;
                flex-direction: column;
                margin-top: 20px;
                padding-top: 20px;
                border-top: 1px solid var(--border);
            }
            .nav.active {
                display: flex;
            }
            .nav-list {
                flex-direction: column;
                width: 100%;
                margin-right: 0;
                margin-bottom: 20px;
            }
            .nav-item {
                margin: 10px 0;
            }
            .header-actions {
                margin-left: 0;
                width: 100%;
                justify-content: center;
            }
        }