:root {
            --px5cu-primary: #bf0000;
            --px5cu-primary-dark: #8b0000;
            --px5cu-secondary: #2c3e50;
            --px5cu-bg-light: #f8f9fa;
            --px5cu-text-main: #1a1a1a;
            --px5cu-text-muted: #666666;
            --px5cu-white: #ffffff;
            --px5cu-spacing: 8px;
            --px5cu-shadow: 0 10px 30px rgba(0,0,0,0.08);
            --px5cu-radius: 12px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
            color: var(--px5cu-text-main);
            line-height: 1.7;
            background-color: var(--px5cu-bg-light);
            word-break: keep-all;
            overflow-x: hidden;
        }

        /* 导航栏 */
        .px5cu-nav-container {
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            box-shadow: var(--px5cu-shadow);
        }

        .px5cu-nav-wrapper {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            height: 80px;
        }

        .px5cu-logo {
            min-width: 0;
            display: flex;
            align-items: center;
        }

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

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

        .px5cu-menu-item a {
            text-decoration: none;
            color: var(--px5cu-text-main);
            font-weight: 500;
            font-size: 14px;
            padding: 8px 12px;
            border-radius: 6px;
            transition: all 0.3s ease;
        }

        .px5cu-menu-item a:hover {
            color: var(--px5cu-primary);
            background: rgba(191, 0, 0, 0.05);
        }

        .px5cu-menu-item a.active {
            color: var(--px5cu-white);
            background: var(--px5cu-primary);
        }

        /* Hero 区域 - 独特对角线布局 */
        .px5cu-hero {
            position: relative;
            padding: 160px 24px 100px;
            background: linear-gradient(135deg, #ffffff 0%, #f0f2f5 100%);
            overflow: hidden;
        }

        .px5cu-hero::before {
            content: "64";
            position: absolute;
            right: -5%;
            top: 10%;
            font-size: 40rem;
            font-weight: 900;
            color: rgba(191, 0, 0, 0.03);
            line-height: 1;
            z-index: 0;
            pointer-events: none;
        }

        .px5cu-container-wide {
            max-width: 1400px;
            margin: 0 auto;
            position: relative;
            z-index: 1;
        }

        .px5cu-hero-content {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 48px;
        }

        .px5cu-hero-text {
            flex: 1;
            min-width: 320px;
            word-break: break-word;
        }

        .px5cu-hero-tag {
            display: inline-block;
            background: var(--px5cu-primary);
            color: white;
            padding: 4px 16px;
            border-radius: 20px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 24px;
        }

        .px5cu-hero-title {
            font-size: clamp(2.5rem, 5vw, 4.5rem);
            line-height: 1.1;
            font-weight: 800;
            margin-bottom: 24px;
            color: var(--px5cu-secondary);
        }

        .px5cu-hero-subtitle {
            font-size: clamp(1.1rem, 2vw, 1.4rem);
            color: var(--px5cu-text-muted);
            margin-bottom: 40px;
            max-width: 700px;
        }

        .px5cu-download-card {
            flex: 0 0 400px;
            background: var(--px5cu-white);
            padding: 40px;
            border-radius: 24px;
            box-shadow: 0 20px 50px rgba(0,0,0,0.1);
            border: 1px solid rgba(0,0,0,0.05);
            min-width: 300px;
            text-align: center;
        }

        .px5cu-btn-primary {
            display: inline-block;
            background: linear-gradient(to right, var(--px5cu-primary), var(--px5cu-primary-dark));
            color: white;
            padding: 18px 48px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 700;
            font-size: 18px;
            box-shadow: 0 10px 20px rgba(191, 0, 0, 0.2);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            margin-bottom: 16px;
        }

        .px5cu-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 15px 30px rgba(191, 0, 0, 0.3);
        }

        /* 核心业务场景展示 */
        .px5cu-workflow-section {
            padding: 96px 24px;
            background: #ffffff;
        }

        .px5cu-section-header {
            text-align: center;
            margin-bottom: 64px;
        }

        .px5cu-section-title {
            font-size: clamp(2rem, 3vw, 2.5rem);
            font-weight: 700;
            margin-bottom: 16px;
        }

        .px5cu-workflow-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
            gap: 32px;
            max-width: 1400px;
            margin: 0 auto;
        }

        .px5cu-workflow-card {
            background: var(--px5cu-bg-light);
            padding: 40px;
            border-radius: var(--px5cu-radius);
            transition: all 0.3s ease;
            border: 1px solid transparent;
            min-width: 0;
        }

        .px5cu-workflow-card:hover {
            background: #fff;
            border-color: var(--px5cu-primary);
            box-shadow: var(--px5cu-shadow);
            transform: translateY(-5px);
        }

        .px5cu-scenario-label {
            color: var(--px5cu-primary);
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1px;
            font-size: 12px;
            margin-bottom: 16px;
            display: block;
        }

        .px5cu-use-case {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--px5cu-secondary);
        }

        .px5cu-feature-highlight {
            font-size: 15px;
            color: var(--px5cu-text-muted);
            margin-bottom: 24px;
        }

        .px5cu-efficiency-badge {
            display: inline-flex;
            align-items: center;
            background: rgba(191, 0, 0, 0.1);
            color: var(--px5cu-primary);
            padding: 6px 16px;
            border-radius: 4px;
            font-weight: 600;
            font-size: 14px;
        }

        /* 动态内容区块标记 */
        .px5cu-news-section {
            padding: 80px 24px;
            background: var(--px5cu-secondary);
            color: white;
        }

        /* 页脚 */
        .px5cu-footer {
            background: #1a1a1a;
            color: #999;
            padding: 80px 24px 40px;
        }

        .px5cu-footer-content {
            max-width: 1400px;
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            gap: 64px;
            margin-bottom: 64px;
        }

        .px5cu-footer-brand {
            flex: 1;
            min-width: 280px;
        }

        .px5cu-footer-brand h3 {
            color: white;
            font-size: 24px;
            margin-bottom: 24px;
        }

        .px5cu-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            flex: 2;
            min-width: 320px;
        }

        .px5cu-link-group {
            min-width: 140px;
        }

        .px5cu-link-group h4 {
            color: white;
            margin-bottom: 20px;
            font-size: 16px;
        }

        .px5cu-link-group ul {
            list-style: none;
        }

        .px5cu-link-group ul li {
            margin-bottom: 12px;
        }

        .px5cu-link-group ul li a {
            color: #999;
            text-decoration: none;
            transition: color 0.3s;
        }

        .px5cu-link-group ul li a:hover {
            color: var(--px5cu-primary);
        }

        .px5cu-copyright {
            max-width: 1400px;
            margin: 0 auto;
            padding-top: 40px;
            border-top: 1px solid #333;
            text-align: center;
            font-size: 14px;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .px5cu-nav-wrapper {
                height: auto;
                padding: 16px;
            }
            .px5cu-menu {
                display: none; /* 简化演示，实际可做汉堡菜单 */
            }
            .px5cu-hero {
                padding-top: 120px;
            }
            .px5cu-download-card {
                flex: 1 1 100%;
            }
            .px5cu-workflow-grid {
                grid-template-columns: 1fr;
            }
        }