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

        html, body {
            height: 100%;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            color: #333;
            line-height: 1.6;
        }

        /* 导航栏样式 */
        .bh040-navbar {
            background: linear-gradient(135deg, #0088cc 0%, #0077b6 100%);
            padding: 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
        }

        .bh040-navbar-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 20px;
        }

        .bh040-navbar-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
            color: white;
            font-weight: bold;
            font-size: 18px;
        }

        .bh040-navbar-logo img {
            height: 36px;
            width: auto;
        }

        .bh040-nav-menu {
            display: flex;
            gap: 30px;
            align-items: center;
        }

        .bh040-nav-link {
            color: white;
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
            transition: opacity 0.3s ease;
            cursor: pointer;
        }

        .bh040-nav-link:hover {
            opacity: 0.8;
            text-decoration: underline;
        }

        /* 主容器 */
        .bh040-main-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 英雄区域 */
        .bh040-hero-section {
            background: linear-gradient(135deg, #f5f7fa 0%, #e9ecef 100%);
            padding: 60px 20px;
            text-align: center;
            margin-top: 20px;
            border-radius: 12px;
        }

        .bh040-hero-title {
            font-size: 42px;
            font-weight: 700;
            color: #0088cc;
            margin-bottom: 20px;
            line-height: 1.3;
        }

        .bh040-hero-subtitle {
            font-size: 18px;
            color: #555;
            margin-bottom: 40px;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        /* CTA按钮区域 */
        .bh040-cta-container {
            display: flex;
            gap: 15px;
            justify-content: center;
            flex-wrap: wrap;
            margin-bottom: 40px;
        }

        .bh040-download-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 16px 32px;
            background: linear-gradient(135deg, #0088cc 0%, #0077b6 100%);
            color: white;
            text-decoration: none;
            border-radius: 8px;
            font-weight: 600;
            font-size: 16px;
            cursor: pointer;
            border: none;
            transition: all 0.3s ease;
            box-shadow: 0 4px 12px rgba(0, 136, 204, 0.3);
        }

        .bh040-download-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(0, 136, 204, 0.4);
        }

        .bh040-download-btn-secondary {
            background: white;
            color: #0088cc;
            border: 2px solid #0088cc;
            box-shadow: none;
        }

        .bh040-download-btn-secondary:hover {
            background: #f0f8ff;
        }

        /* 下载信息卡片 */
        .bh040-download-cards {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin-bottom: 60px;
        }

        .bh040-card {
            background: white;
            border-radius: 12px;
            padding: 30px;
            text-align: center;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
            transition: all 0.3s ease;
            border: 1px solid #e9ecef;
        }

        .bh040-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
        }

        .bh040-card-icon {
            font-size: 40px;
            margin-bottom: 15px;
        }

        .bh040-card-title {
            font-size: 18px;
            font-weight: 600;
            color: #0088cc;
            margin-bottom: 10px;
        }

        .bh040-card-text {
            font-size: 14px;
            color: #666;
            line-height: 1.6;
        }

        /* 功能特性 */
        .bh040-features-section {
            background: white;
            padding: 60px 20px;
            margin: 40px 0;
            border-radius: 12px;
            border: 1px solid #e9ecef;
        }

        .bh040-section-title {
            font-size: 32px;
            font-weight: 700;
            color: #333;
            text-align: center;
            margin-bottom: 40px;
        }

        .bh040-features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
            margin-bottom: 40px;
        }

        .bh040-feature-item {
            display: flex;
            gap: 20px;
            padding: 20px;
            background: #f8f9fa;
            border-radius: 8px;
            border-left: 4px solid #0088cc;
        }

        .bh040-feature-icon {
            font-size: 28px;
            flex-shrink: 0;
            color: #0088cc;
        }

        .bh040-feature-content h3 {
            font-size: 16px;
            color: #333;
            margin-bottom: 8px;
            font-weight: 600;
        }

        .bh040-feature-content p {
            font-size: 14px;
            color: #666;
            line-height: 1.6;
        }

        /* 系统要求表格 */
        .bh040-requirements-section {
            background: #f8f9fa;
            padding: 40px 20px;
            margin: 40px 0;
            border-radius: 12px;
        }

        .bh040-requirements-table {
            width: 100%;
            border-collapse: collapse;
            background: white;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
        }

        .bh040-requirements-table th {
            background: #0088cc;
            color: white;
            padding: 16px;
            text-align: left;
            font-weight: 600;
        }

        .bh040-requirements-table td {
            padding: 14px 16px;
            border-bottom: 1px solid #e9ecef;
        }

        .bh040-requirements-table tr:last-child td {
            border-bottom: none;
        }

        .bh040-requirements-table tr:nth-child(even) {
            background: #f8f9fa;
        }

        /* 常见问题 */
        .bh040-faq-section {
            padding: 60px 20px;
            margin: 40px 0;
        }

        .bh040-faq-item {
            margin-bottom: 20px;
            background: white;
            border-radius: 8px;
            border: 1px solid #e9ecef;
            overflow: hidden;
        }

        .bh040-faq-question {
            padding: 20px;
            background: #f8f9fa;
            cursor: pointer;
            font-weight: 600;
            color: #333;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
            transition: background 0.3s ease;
        }

        .bh040-faq-question:hover {
            background: #e9ecef;
        }

        .bh040-faq-toggle {
            font-size: 20px;
            color: #0088cc;
            transition: transform 0.3s ease;
        }

        .bh040-faq-item.bh040-active .bh040-faq-toggle {
            transform: rotate(180deg);
        }

        .bh040-faq-answer {
            padding: 0 20px;
            max-height: 0;
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .bh040-faq-item.bh040-active .bh040-faq-answer {
            padding: 20px;
            max-height: 500px;
        }

        .bh040-faq-answer p {
            color: #666;
            line-height: 1.8;
            font-size: 14px;
        }

        /* 页脚 */
        .bh040-footer {
            background: linear-gradient(135deg, #0088cc 0%, #0077b6 100%);
            color: white;
            padding: 50px 20px 20px;
            margin-top: 60px;
        }

        .bh040-footer-content {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .bh040-footer-column h3 {
            font-size: 16px;
            margin-bottom: 20px;
            font-weight: 600;
        }

        .bh040-footer-link {
            display: block;
            color: rgba(255, 255, 255, 0.8);
            text-decoration: none;
            font-size: 14px;
            margin-bottom: 10px;
            transition: color 0.3s ease;
        }

        .bh040-footer-link:hover {
            color: white;
        }

        .bh040-footer-bottom {
            max-width: 1200px;
            margin: 0 auto;
            border-top: 1px solid rgba(255, 255, 255, 0.2);
            padding-top: 20px;
            text-align: center;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
        }

        /* 响应式设计 */
        @media (max-width: 768px) {
            .bh040-hero-title {
                font-size: 28px;
            }

            .bh040-hero-subtitle {
                font-size: 16px;
            }

            .bh040-nav-menu {
                gap: 15px;
                flex-wrap: wrap;
            }

            .bh040-nav-link {
                font-size: 12px;
            }

            .bh040-cta-container {
                flex-direction: column;
                align-items: center;
            }

            .bh040-download-btn {
                width: 100%;
                justify-content: center;
            }

            .bh040-section-title {
                font-size: 24px;
            }

            .bh040-footer-content {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }

        /* 加载动画 */
        @keyframes bh040-pulse {
            0%, 100% {
                opacity: 1;
            }
            50% {
                opacity: 0.7;
            }
        }

        .bh040-loading {
            animation: bh040-pulse 2s infinite;
        }

        /* 安全徽章 */
        .bh040-security-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #e8f5e9;
            color: #2e7d32;
            padding: 10px 16px;
            border-radius: 6px;
            font-size: 14px;
            font-weight: 500;
            margin-top: 20px;
        }

        /* 下载进度 */
        .bh040-version-info {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 15px;
            margin-top: 30px;
        }

        .bh040-version-item {
            background: #f8f9fa;
            padding: 15px;
            border-radius: 6px;
            text-align: center;
            border: 1px solid #e9ecef;
        }

        .bh040-version-label {
            font-size: 12px;
            color: #999;
            text-transform: uppercase;
            margin-bottom: 8px;
        }

        .bh040-version-value {
            font-size: 16px;
            font-weight: 600;
            color: #333;
        }