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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            color: #333;
            background-color: #f5f5f5;
            line-height: 1.6;
        }

        /* 导航栏样式 */
        .gcs5s-navbar {
            background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .gcs5s-nav-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 12px 20px;
        }

        .gcs5s-logo-section {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .gcs5s-logo-img {
            height: 40px;
            width: auto;
        }

        .gcs5s-brand-name {
            font-size: 18px;
            font-weight: 700;
            color: #0066cc;
        }

        .gcs5s-nav-menu {
            display: flex;
            gap: 30px;
            list-style: none;
        }

        .gcs5s-nav-link {
            text-decoration: none;
            color: #333;
            font-size: 14px;
            font-weight: 500;
            transition: color 0.3s ease;
        }

        .gcs5s-nav-link:hover {
            color: #0066cc;
        }

        /* 主容器 */
        .gcs5s-main-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 英雄区域 */
        .gcs5s-hero {
            background: linear-gradient(135deg, #0066cc 0%, #0052a3 100%);
            color: white;
            padding: 60px 20px;
            text-align: center;
            border-radius: 12px;
            margin: 40px 0;
        }

        .gcs5s-hero-title {
            font-size: 42px;
            font-weight: 800;
            margin-bottom: 20px;
            line-height: 1.3;
        }

        .gcs5s-hero-subtitle {
            font-size: 18px;
            margin-bottom: 30px;
            opacity: 0.95;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        .gcs5s-hero-features {
            display: flex;
            gap: 20px;
            justify-content: center;
            margin-bottom: 40px;
            flex-wrap: wrap;
            font-size: 14px;
        }

        .gcs5s-hero-feature-item {
            background: rgba(255, 255, 255, 0.2);
            padding: 8px 16px;
            border-radius: 20px;
            backdrop-filter: blur(10px);
        }

        /* 下载区域 */
        .gcs5s-download-section {
            background: white;
            border-radius: 12px;
            padding: 40px;
            margin: 40px 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
        }

        .gcs5s-download-header {
            text-align: center;
            margin-bottom: 40px;
        }

        .gcs5s-download-title {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 10px;
            color: #333;
        }

        .gcs5s-download-subtitle {
            font-size: 16px;
            color: #666;
        }

        .gcs5s-download-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
            margin-bottom: 40px;
        }

        .gcs5s-download-card {
            background: #f8f9fa;
            border: 1px solid #e0e0e0;
            border-radius: 8px;
            padding: 30px;
            text-align: center;
            transition: all 0.3s ease;
        }

        .gcs5s-download-card:hover {
            box-shadow: 0 8px 24px rgba(0, 102, 204, 0.15);
            border-color: #0066cc;
            transform: translateY(-4px);
        }

        .gcs5s-os-icon {
            font-size: 48px;
            margin-bottom: 15px;
        }

        .gcs5s-os-name {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 15px;
            color: #333;
        }

        .gcs5s-version-info {
            font-size: 13px;
            color: #666;
            margin-bottom: 12px;
            line-height: 1.8;
        }

        .gcs5s-file-size {
            font-size: 12px;
            color: #999;
            margin-bottom: 20px;
        }

        .gcs5s-download-btn {
            background: linear-gradient(135deg, #0066cc 0%, #0052a3 100%);
            color: white;
            border: none;
            padding: 14px 32px;
            font-size: 16px;
            font-weight: 600;
            border-radius: 6px;
            cursor: pointer;
            transition: all 0.3s ease;
            width: 100%;
            box-shadow: 0 4px 12px rgba(0, 102, 204, 0.3);
        }

        .gcs5s-download-btn:hover {
            background: linear-gradient(135deg, #0052a3 0%, #003d7a 100%);
            box-shadow: 0 6px 16px rgba(0, 102, 204, 0.4);
            transform: translateY(-2px);
        }

        .gcs5s-download-btn:active {
            transform: translateY(0);
        }

        /* 系统要求 */
        .gcs5s-system-requirements {
            background: #f0f4ff;
            border-left: 4px solid #0066cc;
            padding: 20px;
            border-radius: 6px;
            margin-bottom: 30px;
        }

        .gcs5s-requirements-title {
            font-weight: 600;
            margin-bottom: 12px;
            color: #0066cc;
        }

        .gcs5s-requirements-list {
            font-size: 14px;
            color: #555;
            line-height: 1.8;
        }

        /* 特性区域 */
        .gcs5s-features-section {
            background: white;
            border-radius: 12px;
            padding: 40px;
            margin: 40px 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
        }

        .gcs5s-features-title {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 30px;
            text-align: center;
            color: #333;
        }

        .gcs5s-features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 25px;
        }

        .gcs5s-feature-item {
            padding: 25px;
            background: #f8f9fa;
            border-radius: 8px;
            border-left: 4px solid #0066cc;
            transition: all 0.3s ease;
        }

        .gcs5s-feature-item:hover {
            background: #f0f4ff;
            transform: translateX(4px);
        }

        .gcs5s-feature-icon {
            font-size: 32px;
            margin-bottom: 12px;
        }

        .gcs5s-feature-name {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 10px;
            color: #333;
        }

        .gcs5s-feature-desc {
            font-size: 14px;
            color: #666;
            line-height: 1.6;
        }

        /* 信任标志区域 */
        .gcs5s-trust-section {
            background: white;
            border-radius: 12px;
            padding: 40px;
            margin: 40px 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            text-align: center;
        }

        .gcs5s-trust-title {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 30px;
            color: #333;
        }

        .gcs5s-trust-items {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
        }

        .gcs5s-trust-item {
            padding: 20px;
            background: #f8f9fa;
            border-radius: 8px;
        }

        .gcs5s-trust-icon {
            font-size: 40px;
            margin-bottom: 10px;
        }

        .gcs5s-trust-text {
            font-size: 14px;
            color: #666;
            font-weight: 500;
        }

        /* FAQ区域 */
        .gcs5s-faq-section {
            background: white;
            border-radius: 12px;
            padding: 40px;
            margin: 40px 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
        }

        .gcs5s-faq-title {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 30px;
            color: #333;
        }

        .gcs5s-faq-item {
            border-bottom: 1px solid #e0e0e0;
            padding: 20px 0;
        }

        .gcs5s-faq-item:last-child {
            border-bottom: none;
        }

        .gcs5s-faq-question {
            font-size: 16px;
            font-weight: 600;
            color: #333;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
        }

        .gcs5s-faq-question:hover {
            color: #0066cc;
        }

        .gcs5s-faq-arrow {
            font-size: 18px;
            transition: transform 0.3s ease;
        }

        .gcs5s-faq-answer {
            font-size: 14px;
            color: #666;
            margin-top: 12px;
            line-height: 1.8;
            display: none;
        }

        .gcs5s-faq-answer.active {
            display: block;
        }

        /* CTA区域 */
        .gcs5s-cta-section {
            background: linear-gradient(135deg, #0066cc 0%, #0052a3 100%);
            color: white;
            padding: 50px 20px;
            text-align: center;
            border-radius: 12px;
            margin: 40px 0;
        }

        .gcs5s-cta-title {
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 15px;
        }

        .gcs5s-cta-subtitle {
            font-size: 16px;
            margin-bottom: 30px;
            opacity: 0.95;
        }

        .gcs5s-cta-btn {
            background: white;
            color: #0066cc;
            border: none;
            padding: 16px 40px;
            font-size: 16px;
            font-weight: 700;
            border-radius: 6px;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
        }

        .gcs5s-cta-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
        }

        /* 页脚 */
        .gcs5s-footer {
            background: #1a1a1a;
            color: #999;
            padding: 40px 20px;
            margin-top: 60px;
        }

        .gcs5s-footer-content {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 30px;
            margin-bottom: 30px;
        }

        .gcs5s-footer-section-title {
            color: white;
            font-weight: 600;
            margin-bottom: 15px;
        }

        .gcs5s-footer-link {
            display: block;
            color: #999;
            text-decoration: none;
            font-size: 14px;
            margin-bottom: 10px;
            transition: color 0.3s ease;
        }

        .gcs5s-footer-link:hover {
            color: #0066cc;
        }

        .gcs5s-footer-bottom {
            border-top: 1px solid #333;
            padding-top: 20px;
            text-align: center;
            font-size: 14px;
            color: #666;
        }

        /* 响应式设计 */
        @media (max-width: 768px) {
            .gcs5s-nav-menu {
                gap: 15px;
                font-size: 12px;
            }

            .gcs5s-hero {
                padding: 40px 20px;
            }

            .gcs5s-hero-title {
                font-size: 28px;
            }

            .gcs5s-hero-subtitle {
                font-size: 16px;
            }

            .gcs5s-download-section,
            .gcs5s-features-section,
            .gcs5s-trust-section,
            .gcs5s-faq-section {
                padding: 25px;
            }

            .gcs5s-download-title,
            .gcs5s-features-title {
                font-size: 22px;
            }

            .gcs5s-download-container {
                grid-template-columns: 1fr;
            }

            .gcs5s-cta-title {
                font-size: 24px;
            }

            .gcs5s-footer-content {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 480px) {
            .gcs5s-nav-container {
                flex-direction: column;
                gap: 15px;
            }

            .gcs5s-nav-menu {
                flex-direction: column;
                gap: 10px;
                width: 100%;
            }

            .gcs5s-hero {
                padding: 30px 15px;
            }

            .gcs5s-hero-title {
                font-size: 22px;
            }

            .gcs5s-hero-subtitle {
                font-size: 14px;
            }

            .gcs5s-hero-features {
                flex-direction: column;
                gap: 10px;
            }

            .gcs5s-download-section,
            .gcs5s-features-section,
            .gcs5s-trust-section,
            .gcs5s-faq-section {
                padding: 20px;
                margin: 20px 0;
            }

            .gcs5s-footer-content {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }

        /* 安全认证徽章 */
        .gcs5s-security-badge {
            display: inline-block;
            background: #e8f5e9;
            border: 1px solid #4caf50;
            border-radius: 6px;
            padding: 10px 15px;
            margin: 5px;
            font-size: 12px;
            color: #2e7d32;
            font-weight: 500;
        }

        /* 版本标签 */
        .gcs5s-version-badge {
            display: inline-block;
            background: #e3f2fd;
            color: #1976d2;
            padding: 4px 10px;
            border-radius: 4px;
            font-size: 12px;
            font-weight: 600;
            margin-top: 10px;
        }

        /* 更新时间 */
        .gcs5s-update-time {
            font-size: 12px;
            color: #999;
            margin-top: 8px;
        }