* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            line-height: 1.6;
            color: #202124;
            background-color: #ffffff;
        }

        /* 导航栏样式 */
        .sw9d9n-navbar {
            background-color: #ffffff;
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .sw9d9n-navbar-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 64px;
        }

        .sw9d9n-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 600;
            color: #1f2937;
        }

        .sw9d9n-logo img {
            height: 40px;
            width: auto;
        }

        .sw9d9n-nav-menu {
            display: flex;
            gap: 30px;
            list-style: none;
        }

        .sw9d9n-nav-link {
            text-decoration: none;
            color: #5f6368;
            font-size: 14px;
            font-weight: 500;
            transition: color 0.3s ease;
        }

        .sw9d9n-nav-link:hover {
            color: #1f2937;
        }

        /* 主内容区 */
        .sw9d9n-hero {
            background: linear-gradient(135deg, #f8f9fa 0%, #e8eaed 100%);
            padding: 80px 20px;
            text-align: center;
        }

        .sw9d9n-hero-content {
            max-width: 800px;
            margin: 0 auto;
        }

        .sw9d9n-hero-title {
            font-size: 48px;
            font-weight: 700;
            color: #1f2937;
            margin-bottom: 20px;
            line-height: 1.2;
        }

        .sw9d9n-hero-subtitle {
            font-size: 18px;
            color: #5f6368;
            margin-bottom: 40px;
            line-height: 1.8;
        }

        .sw9d9n-cta-buttons {
            display: flex;
            gap: 20px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .sw9d9n-btn-primary {
            background-color: #1f2937;
            color: #ffffff;
            padding: 14px 32px;
            border: none;
            border-radius: 6px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            text-decoration: none;
            display: inline-block;
        }

        .sw9d9n-btn-primary:hover {
            background-color: #374151;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(31, 41, 55, 0.3);
        }

        .sw9d9n-btn-secondary {
            background-color: #ffffff;
            color: #1f2937;
            padding: 14px 32px;
            border: 2px solid #1f2937;
            border-radius: 6px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            text-decoration: none;
            display: inline-block;
        }

        .sw9d9n-btn-secondary:hover {
            background-color: #1f2937;
            color: #ffffff;
        }

        /* 特性区域 */
        .sw9d9n-features {
            max-width: 1200px;
            margin: 0 auto;
            padding: 80px 20px;
        }

        .sw9d9n-section-title {
            font-size: 36px;
            font-weight: 700;
            color: #1f2937;
            text-align: center;
            margin-bottom: 60px;
        }

        .sw9d9n-features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 40px;
        }

        .sw9d9n-feature-card {
            background-color: #f8f9fa;
            padding: 40px;
            border-radius: 8px;
            transition: all 0.3s ease;
            border: 1px solid #e5e7eb;
        }

        .sw9d9n-feature-card:hover {
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
            transform: translateY(-4px);
        }

        .sw9d9n-feature-icon {
            font-size: 48px;
            margin-bottom: 20px;
        }

        .sw9d9n-feature-title {
            font-size: 20px;
            font-weight: 600;
            color: #1f2937;
            margin-bottom: 12px;
        }

        .sw9d9n-feature-desc {
            font-size: 15px;
            color: #5f6368;
            line-height: 1.8;
        }

        /* 安全性部分 */
        .sw9d9n-security {
            background-color: #f0f4f8;
            padding: 80px 20px;
        }

        .sw9d9n-security-content {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .sw9d9n-security-text h3 {
            font-size: 32px;
            font-weight: 700;
            color: #1f2937;
            margin-bottom: 20px;
        }

        .sw9d9n-security-text p {
            font-size: 16px;
            color: #5f6368;
            margin-bottom: 16px;
            line-height: 1.8;
        }

        .sw9d9n-security-list {
            list-style: none;
            margin-top: 30px;
        }

        .sw9d9n-security-list li {
            padding: 10px 0;
            font-size: 15px;
            color: #374151;
            padding-left: 30px;
            position: relative;
        }

        .sw9d9n-security-list li:before {
            content: "✓";
            position: absolute;
            left: 0;
            color: #059669;
            font-weight: bold;
            font-size: 18px;
        }

        /* 下载区域 */
        .sw9d9n-download {
            max-width: 1200px;
            margin: 0 auto;
            padding: 80px 20px;
            text-align: center;
        }

        .sw9d9n-download-box {
            background: linear-gradient(135deg, #1f2937 0%, #374151 100%);
            color: #ffffff;
            padding: 60px 40px;
            border-radius: 8px;
            margin-top: 40px;
        }

        .sw9d9n-download-title {
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 20px;
        }

        .sw9d9n-download-desc {
            font-size: 16px;
            margin-bottom: 40px;
            opacity: 0.9;
        }

        .sw9d9n-download-options {
            display: flex;
            gap: 20px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .sw9d9n-download-btn {
            background-color: #ffffff;
            color: #1f2937;
            padding: 12px 24px;
            border: none;
            border-radius: 4px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            font-size: 14px;
        }

        .sw9d9n-download-btn:hover {
            background-color: #f0f4f8;
            transform: translateY(-2px);
        }

        /* 关于部分 */
        .sw9d9n-about {
            background-color: #f8f9fa;
            padding: 80px 20px;
        }

        .sw9d9n-about-content {
            max-width: 1200px;
            margin: 0 auto;
        }

        .sw9d9n-about-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 40px;
            margin-top: 40px;
        }

        .sw9d9n-about-card {
            background-color: #ffffff;
            padding: 30px;
            border-radius: 8px;
            border: 1px solid #e5e7eb;
        }

        .sw9d9n-about-card h4 {
            font-size: 18px;
            font-weight: 600;
            color: #1f2937;
            margin-bottom: 12px;
        }

        .sw9d9n-about-card p {
            font-size: 14px;
            color: #5f6368;
            line-height: 1.8;
        }

        /* 联系方式 */
        .sw9d9n-contact {
            max-width: 1200px;
            margin: 0 auto;
            padding: 80px 20px;
            text-align: center;
        }

        .sw9d9n-contact-info {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-top: 40px;
        }

        .sw9d9n-contact-item {
            padding: 30px;
            border: 1px solid #e5e7eb;
            border-radius: 8px;
            transition: all 0.3s ease;
        }

        .sw9d9n-contact-item:hover {
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }

        .sw9d9n-contact-item h4 {
            font-size: 18px;
            font-weight: 600;
            color: #1f2937;
            margin-bottom: 12px;
        }

        .sw9d9n-contact-item p {
            font-size: 14px;
            color: #5f6368;
        }

        .sw9d9n-contact-link {
            color: #1f2937;
            text-decoration: none;
            font-weight: 600;
            margin-top: 10px;
            display: inline-block;
        }

        .sw9d9n-contact-link:hover {
            text-decoration: underline;
        }

        /* 页脚 */
        .sw9d9n-footer {
            background-color: #202124;
            color: #9ca3af;
            padding: 40px 20px;
            text-align: center;
            font-size: 13px;
        }

        .sw9d9n-footer-content {
            max-width: 1200px;
            margin: 0 auto;
        }

        .sw9d9n-footer-links {
            margin-bottom: 20px;
        }

        .sw9d9n-footer-link {
            color: #9ca3af;
            text-decoration: none;
            margin: 0 15px;
            transition: color 0.3s ease;
        }

        .sw9d9n-footer-link:hover {
            color: #ffffff;
        }

        /* 响应式设计 */
        @media (max-width: 768px) {
            .sw9d9n-navbar-container {
                flex-direction: column;
                height: auto;
                padding: 15px 20px;
            }

            .sw9d9n-nav-menu {
                gap: 15px;
                flex-wrap: wrap;
                justify-content: center;
                margin-top: 15px;
            }

            .sw9d9n-hero-title {
                font-size: 32px;
            }

            .sw9d9n-hero-subtitle {
                font-size: 16px;
            }

            .sw9d9n-cta-buttons {
                flex-direction: column;
            }

            .sw9d9n-btn-primary,
            .sw9d9n-btn-secondary {
                width: 100%;
            }

            .sw9d9n-section-title {
                font-size: 28px;
            }

            .sw9d9n-security-content {
                grid-template-columns: 1fr;
                gap: 40px;
            }

            .sw9d9n-security-text h3 {
                font-size: 24px;
            }

            .sw9d9n-download-title {
                font-size: 24px;
            }

            .sw9d9n-footer-links {
                display: flex;
                flex-direction: column;
                gap: 10px;
            }

            .sw9d9n-footer-link {
                margin: 5px 0;
            }
        }