:root {
            --px5cu-primary: #bf0000;
            --px5cu-primary-dark: #8e0000;
            --px5cu-secondary: #2c3e50;
            --px5cu-text: #333333;
            --px5cu-text-light: #666666;
            --px5cu-bg-light: #f8f9fa;
            --px5cu-white: #ffffff;
            --px5cu-shadow: 0 10px 30px rgba(0,0,0,0.08);
            --px5cu-radius: 16px;
            --px5cu-container: 1100px;
        }

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

        body {
            font-family: "Inter", "Microsoft YaHei", sans-serif;
            color: var(--px5cu-text);
            line-height: 1.6;
            background-color: var(--px5cu-bg-light);
            word-break: break-word;
            overflow-x: hidden;
        }

        /* 导航系统 */
        .px5cu-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }

        .px5cu-nav-container {
            max-width: var(--px5cu-container);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            height: 80px;
        }

        .px5cu-logo {
            flex-shrink: 0;
            min-width: 0;
        }

        .px5cu-logo img {
            height: 40px;
            width: auto;
            display: block;
        }

        .px5cu-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 16px;
            min-width: 0;
        }

        .px5cu-nav-item a {
            text-decoration: none;
            color: var(--px5cu-text-light);
            font-size: 0.95rem;
            font-weight: 500;
            padding: 8px 4px;
            transition: color 0.3s ease;
            position: relative;
        }

        .px5cu-nav-item a:hover {
            color: var(--px5cu-primary);
        }

        .px5cu-nav-item a.px5cu-active {
            color: var(--px5cu-primary);
        }

        .px5cu-nav-item a.px5cu-active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--px5cu-primary);
        }

        /* Hero 区块 - 独特非对称布局 */
        .px5cu-hero {
            padding: 160px 24px 80px;
            background: radial-gradient(circle at top right, rgba(191, 0, 0, 0.05), transparent),
                        radial-gradient(circle at bottom left, rgba(44, 62, 80, 0.03), transparent);
            text-align: center;
        }

        .px5cu-hero-content {
            max-width: 800px;
            margin: 0 auto;
        }

        .px5cu-hero h1 {
            font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
            font-weight: 800;
            color: var(--px5cu-secondary);
            line-height: 1.2;
            margin-bottom: 24px;
            word-break: keep-all;
        }

        .px5cu-hero p {
            font-size: clamp(1rem, 1.5vw + 0.5rem, 1.25rem);
            color: var(--px5cu-text-light);
            line-height: 1.8;
            margin-bottom: 48px;
        }

        /* 下载选择器 - 网格布局 */
        .px5cu-download-grid {
            max-width: var(--px5cu-container);
            margin: -40px auto 80px;
            padding: 0 24px;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
        }

        .px5cu-download-card {
            position: relative;
            height: 450px;
            border-radius: var(--px5cu-radius);
            overflow: hidden;
            display: flex;
            flex-direction: column;
            justify-content: flex-end;
            padding: 40px;
            color: var(--px5cu-white);
            box-shadow: var(--px5cu-shadow);
            transition: transform 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
            min-width: 0;
            text-decoration: none;
        }

        .px5cu-download-card:hover {
            transform: translateY(-10px);
        }

        .px5cu-card-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            z-index: 1;
            transition: scale 0.6s ease;
        }

        .px5cu-download-card:hover .px5cu-card-bg {
            scale: 1.1;
        }

        .px5cu-card-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(to top, rgba(0,0,0,0.9) 0%, rgba(0,0,0,0.2) 60%, rgba(0,0,0,0) 100%);
            z-index: 2;
        }

        .px5cu-card-content {
            position: relative;
            z-index: 3;
        }

        .px5cu-card-tag {
            background: var(--px5cu-primary);
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.75rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 16px;
            display: inline-block;
        }

        .px5cu-card-title {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .px5cu-card-desc {
            font-size: 0.9rem;
            opacity: 0.8;
            margin-bottom: 24px;
        }

        .px5cu-btn-download {
            background: var(--px5cu-white);
            color: var(--px5cu-text);
            padding: 12px 24px;
            border-radius: 30px;
            font-weight: 600;
            text-align: center;
            display: inline-block;
            transition: all 0.3s ease;
        }

        .px5cu-download-card:hover .px5cu-btn-download {
            background: var(--px5cu-primary);
            color: var(--px5cu-white);
        }

        /* 企业工作流区块 */
        .px5cu-workflow-section {
            padding: 96px 24px;
            background: var(--px5cu-white);
        }

        .px5cu-section-title {
            max-width: var(--px5cu-container);
            margin: 0 auto 64px;
            text-align: left;
        }

        .px5cu-section-title h2 {
            font-size: clamp(1.5rem, 3vw, 2.5rem);
            color: var(--px5cu-secondary);
            margin-bottom: 16px;
        }

        .px5cu-workflow-grid {
            max-width: var(--px5cu-container);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
        }

        .px5cu-workflow-item {
            flex: 1;
            min-width: 300px;
            padding: 40px;
            background: var(--px5cu-bg-light);
            border-radius: var(--px5cu-radius);
            border: 1px solid rgba(0,0,0,0.03);
            transition: all 0.3s ease;
        }

        .px5cu-workflow-item:hover {
            border-color: var(--px5cu-primary);
            box-shadow: var(--px5cu-shadow);
        }

        .px5cu-workflow-scenario {
            font-weight: 700;
            color: var(--px5cu-primary);
            margin-bottom: 12px;
            display: block;
            font-size: 0.85rem;
            text-transform: uppercase;
        }

        .px5cu-workflow-usecase {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--px5cu-secondary);
        }

        .px5cu-workflow-feature {
            font-size: 0.95rem;
            color: var(--px5cu-text-light);
            margin-bottom: 24px;
            padding-left: 16px;
            border-left: 2px solid var(--px5cu-primary);
        }

        .px5cu-efficiency-badge {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            background: rgba(191, 0, 0, 0.1);
            color: var(--px5cu-primary);
            border-radius: 8px;
            font-weight: 600;
            font-size: 0.9rem;
        }

        /* 资讯/动态区块 */
        .px5cu-news-section {
            padding: 96px 24px;
            background: var(--px5cu-bg-light);
        }

        .px5cu-news-container {
            max-width: var(--px5cu-container);
            margin: 0 auto;
        }

        /* 页脚 */
        .px5cu-footer {
            background: var(--px5cu-secondary);
            color: var(--px5cu-white);
            padding: 80px 24px 40px;
        }

        .px5cu-footer-content {
            max-width: var(--px5cu-container);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
        }

        .px5cu-footer-brand {
            flex: 1;
            min-width: 250px;
        }

        .px5cu-brand-text {
            font-size: 1.5rem;
            font-weight: 800;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }

        .px5cu-footer-links {
            flex: 2;
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            min-width: 0;
        }

        .px5cu-footer-col {
            flex: 1;
            min-width: 150px;
        }

        .px5cu-footer-col h4 {
            margin-bottom: 24px;
            font-size: 1.1rem;
            position: relative;
        }

        .px5cu-footer-col ul {
            list-style: none;
        }

        .px5cu-footer-col li {
            margin-bottom: 12px;
        }

        .px5cu-footer-col a {
            color: rgba(255,255,255,0.6);
            text-decoration: none;
            transition: color 0.3s ease;
        }

        .px5cu-footer-col a:hover {
            color: var(--px5cu-primary);
        }

        .px5cu-footer-bottom {
            max-width: var(--px5cu-container);
            margin: 64px auto 0;
            padding-top: 32px;
            border-top: 1px solid rgba(255,255,255,0.1);
            text-align: center;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.4);
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .px5cu-nav-container {
                height: auto;
                padding: 16px;
            }
            .px5cu-nav-menu {
                display: none; /* 简化移动端，实际项目中需汉堡菜单 */
            }
            .px5cu-hero {
                padding: 120px 24px 60px;
            }
            .px5cu-download-grid {
                margin-top: 0;
            }
            .px5cu-workflow-item {
                min-width: 100%;
            }
        }