:root {
            --color-primary: #1a365d; /* 深蓝导航 */
            --color-secondary: #2d7dd2; /* 科技蓝 */
            --color-accent: #00CC66; /* 终端绿色 */
            --color-light: #f8f9fa;
            --color-dark: #212529;
            --color-gray: #6c757d;
            --color-card-bg: #ffffff;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --border-radius: 12px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            background-color: #f9fbfd;
            color: var(--color-dark);
            line-height: 1.6;
        }

        a {
            text-decoration: none;
            color: inherit;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 头部导航 */
        .navbar {
            background-color: var(--color-primary);
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }

        .navbar .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: #d7d7d7;
            display: flex;
            align-items: center;
        }

        .logo i {
            margin-right: 10px;
            color: var(--color-accent);
        }

        .nav-links {
            display: flex;
            list-style: none;
        }

        .nav-links li {
            margin-left: 2rem;
        }

        .nav-links a {
            color: rgba(255, 255, 255, 0.9);
            font-weight: 500;
            transition: color 0.3s;
            cursor: pointer;
        }

        .nav-links a:hover {
            color: var(--color-accent);
        }

        .nav-links .active a {
            color: var(--color-accent);
            font-weight: 600;
        }

        /* 汉堡菜单（移动端） */
        .menu-toggle {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
        }

        /* 主视觉 */
        .hero {
            padding: 5rem 1rem;
            text-align: center;
            background: linear-gradient(135deg, #f0f7ff 0%, #e6f0ff 100%);
        }

        .hero h1 {
            font-size: 3.2rem;
            margin-bottom: 1.5rem;
            color: var(--color-primary);
        }

        .hero p {
            font-size: 1.3rem;
            color: var(--color-gray);
            max-width: 800px;
            margin: 0 auto 3rem auto;
        }

        .btn-primary {
            display: inline-block;
            background-color: var(--color-accent);
            color: white;
            padding: 1rem 2.5rem;
            font-size: 1.2rem;
            font-weight: 600;
            border-radius: 50px;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(0, 204, 102, 0.3);
            border: none;
            cursor: pointer;
        }

        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(0, 204, 102, 0.4);
        }

        .btn-secondary {
            display: inline-block;
            background-color: var(--color-secondary);
            color: white;
            padding: 0.8rem 1.8rem;
            font-size: 1rem;
            font-weight: 600;
            border-radius: 8px;
            transition: all 0.3s ease;
            border: none;
            cursor: pointer;
            margin: 0.5rem;
        }

        .btn-secondary:hover {
            background-color: #2563b5;
            transform: translateY(-2px);
        }

        .btn-outline {
            display: inline-block;
            background-color: transparent;
            color: var(--color-secondary);
            padding: 0.8rem 1.8rem;
            font-size: 1rem;
            font-weight: 600;
            border-radius: 8px;
            transition: all 0.3s ease;
            border: 2px solid var(--color-secondary);
            cursor: pointer;
            margin: 0.5rem;
        }

        .btn-outline:hover {
            background-color: var(--color-secondary);
            color: white;
        }

        /* 功能区 */
        .section-title {
            text-align: center;
            font-size: 2.2rem;
            margin-bottom: 1rem;
            color: var(--color-primary);
        }

        .section-subtitle {
            text-align: center;
            color: var(--color-gray);
            margin-bottom: 4rem;
            font-size: 1.1rem;
        }

        .section-padding {
            padding: 5rem 1rem;
        }

        .features-grid, .steps-grid, .faq-grid, .download-options, .screenshot-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
        }

        .feature-card, .step-card, .version-card, .faq-card, .download-card, .screenshot-card {
            background-color: var(--color-card-bg);
            border-radius: var(--border-radius);
            padding: 2.5rem 2rem;
            box-shadow: var(--shadow);
            transition: transform 0.3s, box-shadow 0.3s;
            border: 1px solid rgba(0, 0, 0, 0.05);
        }

        .feature-card:hover, .step-card:hover, .download-card:hover, .screenshot-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 24px rgba(0, 0, 0, 0.12);
        }

        .faq-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
        }

        .feature-icon, .step-icon, .download-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, var(--color-secondary), #4a9fff);
            border-radius: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.8rem;
            color: white;
            font-size: 1.8rem;
        }

        .step-icon {
            background: linear-gradient(135deg, var(--color-accent), #00e676);
        }

        .download-icon.quark {
            background: linear-gradient(135deg, #5b6bf2, #8a9bff);
        }

        .download-icon.baidu {
            background: linear-gradient(135deg, #2932e1, #5b6bf2);
        }

        .feature-card h3, .step-card h3, .faq-card h3, .download-card h3, .screenshot-card h3 {
            font-size: 1.5rem;
            margin-bottom: 1rem;
            color: var(--color-primary);
        }

        .feature-card p, .step-card p, .faq-card p, .download-card p, .screenshot-card p {
            color: var(--color-gray);
            line-height: 1.7;
        }

        /* 最新版本 */
        .version-card {
            max-width: 800px;
            margin: 0 auto;
            text-align: center;
        }

        .version-badge {
            display: inline-block;
            background-color: var(--color-accent);
            color: white;
            padding: 0.5rem 1.5rem;
            border-radius: 30px;
            font-weight: 600;
            font-size: 1.1rem;
            margin-bottom: 1.5rem;
        }

        .version-date {
            color: var(--color-gray);
            font-size: 0.95rem;
            margin-bottom: 2rem;
        }

        .changelog {
            text-align: left;
            margin-top: 1.5rem;
        }

        .changelog ul {
            list-style-position: inside;
            color: var(--color-gray);
        }

        .changelog li {
            margin-bottom: 0.7rem;
            padding-left: 0.5rem;
        }

        /* 快速上手 */
        .steps-grid {
            counter-reset: step-counter;
        }

        .step-card {
            position: relative;
            padding-left: 5rem;
        }

        .step-card::before {
            counter-increment: step-counter;
            content: counter(step-counter);
            position: absolute;
            left: 2rem;
            top: 2.5rem;
            font-size: 2.5rem;
            font-weight: 800;
            color: rgba(0, 204, 102, 0.1);
        }

        /* 常见问题 */
        .faq-answer {
            margin-top: 1rem;
            padding: 1rem;
            background-color: #f8f9fa;
            border-radius: 8px;
            display: none;
        }

        .faq-card.active .faq-answer {
            display: block;
        }

        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
        }

        .faq-icon {
            transition: transform 0.3s;
        }

        .faq-card.active .faq-icon {
            transform: rotate(180deg);
        }

        /* 下载选项 */
        .download-options {
            max-width: 800px;
            margin: 3rem auto 0;
        }

        .download-card {
            text-align: center;
        }

        .download-advantages {
            margin-top: 1rem;
            padding-left: 1.5rem;
            text-align: left;
        }

        .download-advantages li {
            margin-bottom: 0.5rem;
            color: var(--color-gray);
        }

        /* 产品截图 */
        .screenshot-card {
            text-align: center;
        }

        .screenshot-img {
            width: 100%;
           
            background: linear-gradient(135deg, #e6f0ff, #f0f7ff);
            border-radius: 12px;
            margin-bottom: 1.5rem;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-secondary);
            font-size: 3rem;
            overflow: hidden;
        }

        .screenshot-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        /* 面包屑导航 (SEO优化) */
        .breadcrumb {
            padding: 1rem 0;
            background-color: #f8f9fa;
            border-bottom: 1px solid #e9ecef;
        }

        .breadcrumb ul {
            display: flex;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .breadcrumb li {
            margin-right: 0.5rem;
            font-size: 0.9rem;
        }

        .breadcrumb li:not(:last-child)::after {
            content: "›";
            margin-left: 0.5rem;
            color: var(--color-gray);
        }

        .breadcrumb a {
            color: var(--color-secondary);
        }

        .breadcrumb a:hover {
            text-decoration: underline;
        }

        .breadcrumb span {
            color: var(--color-gray);
        }

        /* 页脚 */
        footer {
            background-color: var(--color-primary);
            color: rgba(255, 255, 255, 0.8);
            padding: 4rem 1rem 2rem 1rem;
            margin-top: 3rem;
        }

        .footer-content {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 3rem;
            margin-bottom: 3rem;
        }

        .footer-logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: white;
            margin-bottom: 1rem;
        }

        .footer-links h4 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.2rem;
        }

        .footer-links ul {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: 0.8rem;
        }

        .footer-links a:hover {
            color: var(--color-accent);
        }

        .copyright {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
        }

        /* SEO优化隐藏文本 (用于搜索引擎，不显示给用户) */
        .seo-hidden {
            position: absolute;
            left: -9999px;
            top: -9999px;
            height: 1px;
            width: 1px;
            overflow: hidden;
        }

        /* 响应式 */
        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2.5rem;
            }
            
            .nav-links {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background-color: var(--color-primary);
                flex-direction: column;
                padding: 1rem 0;
                box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            }
            
            .nav-links.active {
                display: flex;
            }
            
            .nav-links li {
                margin: 0.5rem 0;
                text-align: center;
            }
            
            .menu-toggle {
                display: block;
            }
            
            .step-card {
                padding-left: 2rem;
            }
            
            .step-card::before {
                position: static;
                display: block;
                margin-bottom: 1rem;
                font-size: 2rem;
            }
            
            .footer-content {
                flex-direction: column;
            }
            
            .breadcrumb ul {
                flex-wrap: wrap;
            }
        }