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

        html, body {
            width: 100%;
            height: 100%;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f8f9fa;
        }

        /* 导航栏样式 */
        .oa02v9-navbar-container {
            background: linear-gradient(135deg, #0088cc 0%, #0066aa 100%);
            box-shadow: 0 2px 10px rgba(0, 136, 204, 0.15);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .oa02v9-navbar-wrapper {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 70px;
        }

        .oa02v9-logo-section {
            display: flex;
            align-items: center;
            gap: 12px;
            text-decoration: none;
            color: white;
        }

        .oa02v9-logo-img {
            width: 40px;
            height: 40px;
            object-fit: contain;
        }

        .oa02v9-brand-text {
            font-size: 18px;
            font-weight: 700;
            color: white;
            letter-spacing: 0.5px;
        }

        .oa02v9-nav-menu {
            display: flex;
            gap: 30px;
            list-style: none;
        }

        .oa02v9-nav-link {
            color: white;
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
            transition: opacity 0.3s ease, color 0.3s ease;
            position: relative;
        }

        .oa02v9-nav-link:hover {
            opacity: 0.8;
        }

        .oa02v9-nav-link::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background-color: #ffeb3b;
            transition: width 0.3s ease;
        }

        .oa02v9-nav-link:hover::after {
            width: 100%;
        }

        /* 主容器 */
        .oa02v9-main-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 英雄区域 */
        .oa02v9-hero-section {
            background: linear-gradient(135deg, #0088cc 0%, #00a8e8 100%);
            color: white;
            padding: 80px 20px;
            text-align: center;
            margin-bottom: 60px;
        }

        .oa02v9-hero-content {
            max-width: 800px;
            margin: 0 auto;
        }

        .oa02v9-hero-title {
            font-size: 48px;
            font-weight: 800;
            margin-bottom: 20px;
            line-height: 1.2;
            text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        }

        .oa02v9-hero-subtitle {
            font-size: 18px;
            margin-bottom: 40px;
            opacity: 0.95;
            font-weight: 300;
            letter-spacing: 0.5px;
        }

        .oa02v9-hero-buttons {
            display: flex;
            gap: 20px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .oa02v9-btn-primary {
            background: #ffeb3b;
            color: #0088cc;
            padding: 16px 40px;
            font-size: 16px;
            font-weight: 700;
            border: none;
            border-radius: 50px;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(255, 235, 59, 0.3);
            text-decoration: none;
            display: inline-block;
        }

        .oa02v9-btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(255, 235, 59, 0.4);
        }

        .oa02v9-btn-secondary {
            background: rgba(255, 255, 255, 0.2);
            color: white;
            padding: 16px 40px;
            font-size: 16px;
            font-weight: 600;
            border: 2px solid white;
            border-radius: 50px;
            cursor: pointer;
            transition: all 0.3s ease;
            text-decoration: none;
            display: inline-block;
        }

        .oa02v9-btn-secondary:hover {
            background: white;
            color: #0088cc;
        }

        /* 下载版本区域 */
        .oa02v9-downloads-section {
            padding: 60px 20px;
            background: white;
            margin-bottom: 60px;
            border-radius: 10px;
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
        }

        .oa02v9-section-title {
            font-size: 36px;
            font-weight: 800;
            margin-bottom: 50px;
            text-align: center;
            color: #0088cc;
            position: relative;
            padding-bottom: 20px;
        }

        .oa02v9-section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: linear-gradient(90deg, #0088cc, #00a8e8);
            border-radius: 2px;
        }

        .oa02v9-downloads-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
            margin-bottom: 40px;
        }

        .oa02v9-download-card {
            background: #f8f9fa;
            border: 2px solid #e9ecef;
            border-radius: 12px;
            padding: 30px;
            text-align: center;
            transition: all 0.3s ease;
            cursor: pointer;
        }

        .oa02v9-download-card:hover {
            border-color: #0088cc;
            box-shadow: 0 8px 30px rgba(0, 136, 204, 0.15);
            transform: translateY(-5px);
        }

        .oa02v9-platform-icon {
            font-size: 48px;
            margin-bottom: 20px;
            color: #0088cc;
        }

        .oa02v9-platform-name {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 15px;
            color: #333;
        }

        .oa02v9-version-info {
            font-size: 12px;
            color: #666;
            margin-bottom: 8px;
            line-height: 1.8;
        }

        .oa02v9-file-size {
            background: white;
            padding: 10px;
            border-radius: 6px;
            font-size: 13px;
            color: #0088cc;
            font-weight: 600;
            margin-bottom: 20px;
        }

        .oa02v9-download-btn {
            background: linear-gradient(135deg, #0088cc 0%, #0066aa 100%);
            color: white;
            padding: 14px 28px;
            font-size: 15px;
            font-weight: 700;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.3s ease;
            width: 100%;
            text-decoration: none;
            display: inline-block;
        }

        .oa02v9-download-btn:hover {
            transform: scale(1.02);
            box-shadow: 0 4px 15px rgba(0, 136, 204, 0.3);
        }

        /* 系统要求 */
        .oa02v9-requirements-section {
            padding: 60px 20px;
            background: #f8f9fa;
            margin-bottom: 60px;
            border-radius: 10px;
        }

        .oa02v9-requirements-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 25px;
        }

        .oa02v9-requirement-item {
            background: white;
            padding: 25px;
            border-left: 4px solid #0088cc;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
        }

        .oa02v9-requirement-title {
            font-size: 16px;
            font-weight: 700;
            color: #0088cc;
            margin-bottom: 12px;
        }

        .oa02v9-requirement-text {
            font-size: 14px;
            color: #666;
            line-height: 1.8;
        }

        /* 功能介绍 */
        .oa02v9-features-section {
            padding: 60px 20px;
            background: white;
            margin-bottom: 60px;
            border-radius: 10px;
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
        }

        .oa02v9-features-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
        }

        .oa02v9-feature-item {
            display: flex;
            gap: 20px;
            align-items: flex-start;
        }

        .oa02v9-feature-icon {
            width: 48px;
            height: 48px;
            background: linear-gradient(135deg, #0088cc 0%, #00a8e8 100%);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: white;
            flex-shrink: 0;
        }

        .oa02v9-feature-content {
            flex: 1;
        }

        .oa02v9-feature-title {
            font-size: 16px;
            font-weight: 700;
            color: #333;
            margin-bottom: 8px;
        }

        .oa02v9-feature-desc {
            font-size: 14px;
            color: #666;
            line-height: 1.6;
        }

        /* 常见问题 */
        .oa02v9-faq-section {
            padding: 60px 20px;
            background: #f8f9fa;
            margin-bottom: 60px;
            border-radius: 10px;
        }

        .oa02v9-faq-items {
            max-width: 800px;
            margin: 0 auto;
        }

        .oa02v9-faq-item {
            background: white;
            margin-bottom: 20px;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
        }

        .oa02v9-faq-question {
            padding: 20px;
            background: white;
            cursor: pointer;
            font-weight: 700;
            color: #333;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: all 0.3s ease;
        }

        .oa02v9-faq-question:hover {
            background: #f0f7ff;
            color: #0088cc;
        }

        .oa02v9-faq-toggle {
            font-size: 20px;
            color: #0088cc;
            transition: transform 0.3s ease;
        }

        .oa02v9-faq-item.active .oa02v9-faq-toggle {
            transform: rotate(180deg);
        }

        .oa02v9-faq-answer {
            padding: 0 20px;
            max-height: 0;
            overflow: hidden;
            transition: all 0.3s ease;
            background: #f8f9fa;
        }

        .oa02v9-faq-item.active .oa02v9-faq-answer {
            padding: 20px;
            max-height: 500px;
        }

        .oa02v9-faq-text {
            color: #666;
            font-weight: 400;
            line-height: 1.8;
        }

        /* CTA区域 */
        .oa02v9-cta-section {
            background: linear-gradient(135deg, #0088cc 0%, #00a8e8 100%);
            color: white;
            padding: 80px 20px;
            text-align: center;
            border-radius: 10px;
            margin-bottom: 60px;
        }

        .oa02v9-cta-title {
            font-size: 40px;
            font-weight: 800;
            margin-bottom: 20px;
            text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        }

        .oa02v9-cta-subtitle {
            font-size: 18px;
            margin-bottom: 40px;
            opacity: 0.95;
        }

        .oa02v9-cta-buttons {
            display: flex;
            gap: 20px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* 页脚 */
        .oa02v9-footer-container {
            background: #1a1a1a;
            color: #999;
            padding: 50px 20px 30px;
            margin-top: 60px;
        }

        .oa02v9-footer-content {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .oa02v9-footer-column {
            text-align: left;
        }

        .oa02v9-footer-title {
            color: white;
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 20px;
        }

        .oa02v9-footer-link {
            display: block;
            color: #999;
            text-decoration: none;
            font-size: 14px;
            margin-bottom: 12px;
            transition: color 0.3s ease;
        }

        .oa02v9-footer-link:hover {
            color: #0088cc;
        }

        .oa02v9-footer-bottom {
            border-top: 1px solid #333;
            padding-top: 30px;
            text-align: center;
            font-size: 13px;
            color: #666;
        }

        .oa02v9-footer-copyright {
            margin-bottom: 10px;
        }

        .oa02v9-footer-disclaimer {
            font-size: 12px;
            color: #555;
            line-height: 1.6;
        }

        /* 响应式设计 */
        @media (max-width: 768px) {
            .oa02v9-hero-title {
                font-size: 32px;
            }

            .oa02v9-hero-subtitle {
                font-size: 16px;
            }

            .oa02v9-hero-buttons {
                flex-direction: column;
            }

            .oa02v9-btn-primary,
            .oa02v9-btn-secondary {
                width: 100%;
            }

            .oa02v9-nav-menu {
                gap: 15px;
            }

            .oa02v9-nav-link {
                font-size: 12px;
            }

            .oa02v9-section-title {
                font-size: 28px;
            }

            .oa02v9-downloads-grid {
                grid-template-columns: 1fr;
            }

            .oa02v9-cta-title {
                font-size: 28px;
            }

            .oa02v9-cta-buttons {
                flex-direction: column;
            }

            .oa02v9-navbar-wrapper {
                flex-wrap: wrap;
            }
        }

        @media (max-width: 480px) {
            .oa02v9-hero-section {
                padding: 50px 15px;
            }

            .oa02v9-hero-title {
                font-size: 24px;
            }

            .oa02v9-downloads-section {
                padding: 40px 15px;
            }

            .oa02v9-nav-menu {
                display: none;
            }

            .oa02v9-cta-title {
                font-size: 22px;
            }
        }

        /* 平滑滚动 */
        html {
            scroll-behavior: smooth;
        }

        /* 按钮动画 */
        @keyframes pulse {
            0%, 100% {
                opacity: 1;
            }
            50% {
                opacity: 0.8;
            }
        }

        .oa02v9-btn-primary.pulse {
            animation: pulse 2s infinite;
        }