* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        :root {
            --primary: #b11e31;
            --primary-dark: #8b1726;
            --secondary: #2c3e50;
            --accent: #e74c3c;
            --bg-light: #f8f9fa;
            --text-dark: #2c3e50;
            --text-light: #7f8c8d;
            --white: #ffffff;
            --shadow: 0 4px 6px rgba(0,0,0,0.1);
            --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
        }
        
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            line-height: 1.6;
            color: var(--text-dark);
            overflow-x: hidden;
        }
        
        /* PC端容器限制 */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 头部导航 */
        header {
            background: var(--white);
            box-shadow: var(--shadow);
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
            transition: all 0.3s;
        }
        
        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 70px;
        }
        
        .logo {
            display: flex;
            align-items: center;
            font-size: 24px;
            font-weight: 700;
            color: var(--primary);
            text-decoration: none;
        }
        
        .logo-icon {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
            border-radius: 8px;
            margin-right: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
            font-size: 20px;
        }
        
        .nav-menu {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        
        .nav-menu a {
            text-decoration: none;
            color: var(--text-dark);
            font-weight: 500;
            transition: color 0.3s;
            position: relative;
        }
        
        .nav-menu a:hover {
            color: var(--primary);
        }
        
        .nav-menu a::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: width 0.3s;
        }
        
        .nav-menu a:hover::after {
            width: 100%;
        }
        
        /* 语言切换器 */
        .lang-switcher {
            position: relative;
            margin-left: 20px;
        }
        
        .lang-btn {
            background: var(--bg-light);
            border: 1px solid #ddd;
            padding: 8px 16px;
            border-radius: 20px;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            transition: all 0.3s;
        }
        
        .lang-btn:hover {
            background: var(--primary);
            color: white;
            border-color: var(--primary);
        }
        
        .lang-dropdown {
            position: absolute;
            top: 100%;
            right: 0;
            background: white;
            box-shadow: var(--shadow-lg);
            border-radius: 8px;
            margin-top: 10px;
            min-width: 150px;
            opacity: 0;
            visibility: hidden;
            transform: translateY(-10px);
            transition: all 0.3s;
        }
        
        .lang-switcher:hover .lang-dropdown {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }
        
        .lang-dropdown a {
            display: block;
            padding: 12px 20px;
            text-decoration: none;
            color: var(--text-dark);
            border-bottom: 1px solid #eee;
            transition: background 0.3s;
        }
        
        .lang-dropdown a:last-child {
            border-bottom: none;
        }
        
        .lang-dropdown a:hover {
            background: var(--bg-light);
            color: var(--primary);
        }
        
        /* 移动端菜单按钮 */
        .mobile-menu-btn {
            display: none;
            flex-direction: column;
            cursor: pointer;
            padding: 5px;
            z-index: 1001;
        }
        
        .mobile-menu-btn span {
            width: 25px;
            height: 3px;
            background: var(--text-dark);
            margin: 3px 0;
            transition: 0.3s;
        }
        
        /* 移动端侧边栏优化 */
.mobile-sidebar {
    position: fixed;
    top: 0;
    right: -300px;
    width: 300px;
    height: 100vh;
    background: white;
    box-shadow: -5px 0 15px rgba(0,0,0,0.1);
    transition: right 0.3s;
    z-index: 999;
    padding: 80px 25px 30px;
    overflow-y: auto;
}

.mobile-sidebar.active {
    right: 0;
}
        /* 隐藏原来的语言切换器样式冲突 */
.mobile-sidebar .lang-switcher {
    display: none !important;
}
        .mobile-sidebar .nav-menu {
            flex-direction: column;
            gap: 20px;
        }
        
        .mobile-sidebar .lang-switcher {
            margin: 30px 0 0 0;
            display: block;
        }
        
        .mobile-sidebar .lang-dropdown {
            position: static;
            opacity: 1;
            visibility: visible;
            transform: none;
            box-shadow: none;
            margin-top: 10px;
            display: none;
        }
        
        .mobile-sidebar .lang-switcher.active .lang-dropdown {
            display: block;
        }
        
        .overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.5);
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
            z-index: 998;
        }
        
        .overlay.active {
            opacity: 1;
            visibility: visible;
        }
        
        /* Hero区域 */
        .hero {
            margin-top: 70px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 100px 0;
            position: relative;
            overflow: hidden;
        }
        
        .hero::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -10%;
            width: 600px;
            height: 600px;
            background: rgba(255,255,255,0.1);
            border-radius: 50%;
        }
        
        .hero-content {
            position: relative;
            z-index: 1;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        
        .hero h1 {
            font-size: 48px;
            line-height: 1.2;
            margin-bottom: 20px;
            font-weight: 700;
        }
        
        .hero h1 span {
            color: #ffd700;
        }
        
        .hero-subtitle {
            font-size: 20px;
            margin-bottom: 30px;
            opacity: 0.95;
        }
        
        .hero-badges {
            display: flex;
            gap: 15px;
            margin-bottom: 30px;
            flex-wrap: wrap;
        }
        
        .badge {
            background: rgba(255,255,255,0.2);
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 14px;
            backdrop-filter: blur(10px);
        }
        
        .hero-cta {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
        }
        
        .btn {
            padding: 15px 40px;
            border-radius: 30px;
            text-decoration: none;
            font-weight: 600;
            font-size: 16px;
            transition: all 0.3s;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            border: none;
            cursor: pointer;
        }
        
        .btn-primary {
            background: var(--primary);
            color: white;
            box-shadow: 0 4px 15px rgba(177, 30, 49, 0.4);
        }
        
        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(177, 30, 49, 0.6);
        }
        
        .btn-secondary {
            background: rgba(255,255,255,0.2);
            color: white;
            border: 2px solid rgba(255,255,255,0.5);
        }
        
        .btn-secondary:hover {
            background: rgba(255,255,255,0.3);
            border-color: white;
        }
        
        .hero-image {
            position: relative;
        }
        
        .hero-image img {
            width: 100%;
            border-radius: 12px;
            box-shadow: var(--shadow-lg);
            transform: perspective(1000px) rotateY(-5deg);
            transition: transform 0.3s;
        }
        
        .hero-image:hover img {
            transform: perspective(1000px) rotateY(0deg);
        }
        
        /* 下载区域 */
        .download-section {
            padding: 80px 0;
            background: var(--bg-light);
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 50px;
        }
        
        .section-title h2 {
            font-size: 36px;
            color: var(--text-dark);
            margin-bottom: 15px;
        }
        
        .section-title p {
            color: var(--text-light);
            font-size: 18px;
        }
        
        .download-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 30px;
            max-width: 800px;
            margin: 0 auto;
        }
        
        .download-card {
            background: white;
            padding: 40px;
            border-radius: 16px;
            text-align: center;
            box-shadow: var(--shadow);
            transition: all 0.3s;
            border: 2px solid transparent;
        }
        
        .download-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary);
        }
        
        .download-icon {
            width: 80px;
            height: 80px;
            margin: 0 auto 20px;
            background: var(--bg-light);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 36px;
        }
        
        .download-card h3 {
            font-size: 24px;
            margin-bottom: 10px;
            color: var(--text-dark);
        }
        
        .download-card p {
            color: var(--text-light);
            margin-bottom: 20px;
            font-size: 14px;
        }
        
        .download-meta {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-bottom: 20px;
            font-size: 13px;
            color: var(--text-light);
        }
        
        .download-btn {
            display: block;
            width: 100%;
            padding: 15px;
            background: var(--primary);
            color: white;
            text-decoration: none;
            border-radius: 8px;
            font-weight: 600;
            transition: all 0.3s;
            margin-bottom: 10px;
        }
        
        .download-btn:hover {
            background: var(--primary-dark);
            transform: scale(1.02);
        }
        
        .download-btn.secondary {
            background: #4285f4;
        }
        
        .download-btn.secondary:hover {
            background: #3367d6;
        }
        
        /* 核心功能 */
        .features {
            padding: 80px 0;
        }
        
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        
        .feature-card {
            padding: 40px 30px;
            background: white;
            border-radius: 12px;
            box-shadow: var(--shadow);
            transition: all 0.3s;
            border-top: 4px solid var(--primary);
        }
        
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
        }
        
        .feature-icon {
            width: 60px;
            height: 60px;
            background: var(--bg-light);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            margin-bottom: 20px;
            color: var(--primary);
        }
        
        .feature-card h3 {
            font-size: 20px;
            margin-bottom: 15px;
            color: var(--text-dark);
        }
        
        .feature-card p {
            color: var(--text-light);
            line-height: 1.8;
        }
        
        .feature-list {
            list-style: none;
            margin-top: 15px;
        }
        
        .feature-list li {
            padding: 8px 0;
            padding-left: 25px;
            position: relative;
            color: var(--text-light);
            font-size: 14px;
        }
        
        .feature-list li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--primary);
            font-weight: bold;
        }
        
        /* 适用场景 */
        .scenarios {
            padding: 80px 0;
            background: var(--bg-light);
        }
        
        .scenarios-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 25px;
        }
        
        .scenario-card {
            background: white;
            padding: 30px;
            border-radius: 12px;
            text-align: center;
            transition: all 0.3s;
            position: relative;
            overflow: hidden;
        }
        
        .scenario-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            transform: scaleX(0);
            transition: transform 0.3s;
        }
        
        .scenario-card:hover::before {
            transform: scaleX(1);
        }
        
        .scenario-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
        }
        
        .scenario-icon {
            font-size: 40px;
            margin-bottom: 15px;
        }
        
        .scenario-card h3 {
            font-size: 18px;
            margin-bottom: 10px;
        }
        
        .scenario-card p {
            font-size: 14px;
            color: var(--text-light);
        }
        
        /* 系统要求 */
        .requirements {
            padding: 80px 0;
        }
        
        .requirements-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }
        
        .requirements-table {
            width: 100%;
            border-collapse: collapse;
            background: white;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        
        .requirements-table th,
        .requirements-table td {
            padding: 16px;
            text-align: left;
            border-bottom: 1px solid #eee;
        }
        
        .requirements-table th {
            background: var(--primary);
            color: white;
            font-weight: 600;
        }
        
        .requirements-table tr:last-child td {
            border-bottom: none;
        }
        
        .requirements-table tr:hover {
            background: var(--bg-light);
        }
        
        .requirements-info h3 {
            font-size: 28px;
            margin-bottom: 20px;
            color: var(--text-dark);
        }
        
        .requirements-info p {
            color: var(--text-light);
            margin-bottom: 20px;
            line-height: 1.8;
        }
        
        .requirements-info ul {
            list-style: none;
        }
        
        .requirements-info li {
            padding: 10px 0;
            padding-left: 30px;
            position: relative;
        }
        
        .requirements-info li::before {
            content: '▸';
            position: absolute;
            left: 0;
            color: var(--primary);
            font-weight: bold;
        }
        
        /* 常见问题 */
        .faq {
            padding: 80px 0;
            background: var(--bg-light);
        }
        
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        
        .faq-item {
            background: white;
            margin-bottom: 15px;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        
        .faq-question {
            padding: 20px 25px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            transition: background 0.3s;
        }
        
        .faq-question:hover {
            background: var(--bg-light);
        }
        
        .faq-question::after {
            content: '+';
            font-size: 24px;
            color: var(--primary);
            transition: transform 0.3s;
        }
        
        .faq-item.active .faq-question::after {
            transform: rotate(45deg);
        }
        
        .faq-answer {
            padding: 0 25px;
            max-height: 0;
            overflow: hidden;
            transition: all 0.3s;
            color: var(--text-light);
            line-height: 1.8;
        }
        
        .faq-item.active .faq-answer {
            padding: 0 25px 20px;
            max-height: 200px;
        }
        
        /* 友情链接 */
        .friends {
            padding: 60px 0;
            border-top: 1px solid #eee;
        }
        
        .friends h3 {
            text-align: center;
            margin-bottom: 30px;
            color: var(--text-light);
            font-size: 18px;
            font-weight: 500;
        }
        
        .friends-list {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 20px;
        }
        
        .friends-list a {
            color: var(--text-light);
            text-decoration: none;
            padding: 8px 16px;
            background: var(--bg-light);
            border-radius: 20px;
            font-size: 14px;
            transition: all 0.3s;
        }
        
        .friends-list a:hover {
            background: var(--primary);
            color: white;
        }
        
        /* 页脚 */
        footer {
            background: var(--secondary);
            color: white;
            padding: 50px 0 20px;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        
        .footer-section h4 {
            margin-bottom: 20px;
            color: #fff;
        }
        
        .footer-section p,
        .footer-section a {
            color: #bdc3c7;
            text-decoration: none;
            line-height: 2;
            font-size: 14px;
            display: block;
            transition: color 0.3s;
        }
        
        .footer-section a:hover {
            color: white;
        }
        
        .footer-bottom {
            border-top: 1px solid #34495e;
            padding-top: 20px;
            text-align: center;
            color: #95a5a6;
            font-size: 14px;
        }
        
        /* 悬浮广告 */
        .floating-bar {
            position: fixed;
            bottom: 0;
            left: 0;
            width: 100%;
            background: white;
            box-shadow: 0 -4px 20px rgba(0,0,0,0.15);
            padding: 15px 0;
            z-index: 999;
            transform: translateY(100%);
            transition: transform 0.3s;
        }
        
        .floating-bar.visible {
            transform: translateY(0);
        }
        
        .floating-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        .floating-text {
            display: flex;
            align-items: center;
            gap: 15px;
        }
        
        .floating-text img {
            width: 40px;
            height: 40px;
            border-radius: 8px;
        }
        
        .floating-text div h4 {
            font-size: 16px;
            margin-bottom: 4px;
        }
        
        .floating-text div p {
            font-size: 13px;
            color: var(--text-light);
        }
        
        .floating-btn {
            background: var(--primary);
            color: white;
            padding: 12px 30px;
            border-radius: 25px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s;
        }
        
        .floating-btn:hover {
            background: var(--primary-dark);
            transform: scale(1.05);
        }
        
        /* 返回顶部 */
        .back-to-top {
            position: fixed;
            bottom: 80px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary);
            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: 998;
            box-shadow: var(--shadow-lg);
            font-size: 20px;
        }
        
        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }
        
        .back-to-top:hover {
            background: var(--primary-dark);
            transform: translateY(-3px);
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .container {
                padding: 0 15px;
            }
            
            .nav-menu {
                display: none;
            }
            
            .mobile-menu-btn {
                display: flex;
            }
            
            .lang-switcher.desktop {
                display: none;
            }
            
            .hero {
                padding: 60px 0;
            }
            
            .hero-content {
                grid-template-columns: 1fr;
                text-align: center;
                gap: 40px;
            }
            
            .hero h1 {
                font-size: 32px;
            }
            
            .hero-subtitle {
                font-size: 16px;
            }
            
            .hero-badges {
                justify-content: center;
            }
            
            .hero-cta {
                justify-content: center;
            }
            
            .hero-image {
                order: -1;
            }
            
            .download-grid {
                grid-template-columns: 1fr;
            }
            
            .features-grid {
                grid-template-columns: 1fr;
            }
            
            .scenarios-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .requirements-content {
                grid-template-columns: 1fr;
            }
            
            .footer-content {
                grid-template-columns: 1fr;
                text-align: center;
                gap: 30px;
            }
            
            .floating-content {
                flex-direction: column;
                gap: 15px;
                text-align: center;
            }
            
            .back-to-top {
                right: 15px;
                bottom: 100px;
            }
        }
        
        @media (max-width: 480px) {
            .scenarios-grid {
                grid-template-columns: 1fr;
            }
            
            .btn {
                width: 100%;
                justify-content: center;
            }
        }
        
        /* SEO优化隐藏文本 */
        .seo-text {
            position: absolute;
            left: -9999px;
            width: 1px;
            height: 1px;
            overflow: hidden;
        }