:root {
            --px5cu-primary: #bf0000;
            --px5cu-primary-dark: #8b0000;
            --px5cu-secondary: #2c3e50;
            --px5cu-accent: #3498db;
            --px5cu-bg-light: #f9f9fb;
            --px5cu-text-main: #2d3436;
            --px5cu-text-muted: #636e72;
            --px5cu-white: #ffffff;
            --px5cu-shadow: 0 10px 30px rgba(0,0,0,0.08);
            --px5cu-transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
        }

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

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

        /* Layout Container */
        .px5cu-container {
            max-width: 1300px;
            margin: 0 auto;
            padding: 0 40px;
            width: 100%;
        }

        @media (max-width: 768px) {
            .px5cu-container {
                padding: 0 20px;
            }
        }

        /* Navigation */
        .px5cu-header {
            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);
            padding: 15px 0;
        }

        .px5cu-nav-wrapper {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
        }

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

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

        .px5cu-nav-list {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 20px;
        }

        .px5cu-nav-item a {
            text-decoration: none;
            color: var(--px5cu-text-main);
            font-size: 14px;
            font-weight: 500;
            transition: var(--px5cu-transition);
            word-break: keep-all;
        }

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

        @media (max-width: 1024px) {
            .px5cu-nav-list {
                gap: 10px;
            }
            .px5cu-nav-item a {
                font-size: 13px;
            }
        }

        /* Hero Section - Unique Card Style */
        .px5cu-hero {
            padding: 160px 0 80px;
            background: linear-gradient(135deg, #fff 0%, #f1f2f6 100%);
            position: relative;
            overflow: hidden;
        }

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

        .px5cu-hero-subtitle {
            font-size: clamp(1rem, 1.5vw + 0.5rem, 1.25rem);
            color: var(--px5cu-text-muted);
            margin-bottom: 40px;
            max-width: 600px;
        }

        .px5cu-hero-visual {
            flex: 1;
            min-width: 320px;
            background: var(--px5cu-white);
            padding: 40px;
            border-radius: 24px;
            box-shadow: var(--px5cu-shadow);
            border: 1px solid rgba(0,0,0,0.03);
            text-align: center;
        }

        .px5cu-download-card {
            background: var(--px5cu-bg-light);
            border-radius: 16px;
            padding: 32px;
            border: 2px dashed var(--px5cu-primary);
        }

        .px5cu-badge {
            display: inline-block;
            background: var(--px5cu-primary);
            color: white;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            margin-bottom: 16px;
        }

        /* Workflow Section - Grid */
        .px5cu-workflow {
            padding: 96px 0;
            background: var(--px5cu-white);
        }

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

        .px5cu-section-title {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .px5cu-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
        }

        .px5cu-card {
            background: var(--px5cu-bg-light);
            padding: 40px;
            border-radius: 20px;
            transition: var(--px5cu-transition);
            border: 1px solid transparent;
            word-break: break-word;
        }

        .px5cu-card:hover {
            transform: translateY(-10px);
            background: var(--px5cu-white);
            box-shadow: var(--px5cu-shadow);
            border-color: var(--px5cu-primary);
        }

        .px5cu-card-tag {
            font-size: 14px;
            font-weight: 700;
            color: var(--px5cu-primary);
            text-transform: uppercase;
            margin-bottom: 12px;
            display: block;
        }

        .px5cu-card-h3 {
            font-size: 1.5rem;
            margin-bottom: 16px;
            color: var(--px5cu-secondary);
        }

        .px5cu-efficiency {
            margin-top: 20px;
            padding-top: 20px;
            border-top: 1px solid rgba(0,0,0,0.05);
            font-weight: 600;
            color: #27ae60;
        }

        /* Button Component */
        .px5cu-btn {
            display: inline-block;
            padding: 16px 40px;
            border-radius: 50px;
            font-weight: 700;
            text-decoration: none;
            transition: var(--px5cu-transition);
            cursor: pointer;
            text-align: center;
            border: none;
        }

        .px5cu-btn-primary {
            background: var(--px5cu-primary);
            color: white;
            box-shadow: 0 10px 20px rgba(191, 0, 0, 0.2);
        }

        .px5cu-btn-primary:hover {
            background: var(--px5cu-primary-dark);
            transform: scale(1.05);
        }

        /* Portable Benefits Section */
        .px5cu-portable-info {
            padding: 96px 0;
            background: var(--px5cu-secondary);
            color: white;
        }

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

        .px5cu-info-text {
            flex: 1;
            min-width: 320px;
        }

        .px5cu-info-list {
            list-style: none;
            margin-top: 32px;
        }

        .px5cu-info-item {
            margin-bottom: 24px;
            padding-left: 32px;
            position: relative;
        }

        .px5cu-info-item::before {
            content: "✓";
            position: absolute;
            left: 0;
            color: var(--px5cu-primary);
            font-weight: 900;
        }

        /* Footer */
        .px5cu-footer {
            background: #1a1a1a;
            color: #bdc3c7;
            padding: 80px 0 40px;
        }

        .px5cu-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 64px;
        }

        .px5cu-footer-brand {
            font-size: 24px;
            color: white;
            font-weight: 800;
            margin-bottom: 20px;
        }

        .px5cu-footer-links h4 {
            color: white;
            margin-bottom: 24px;
            font-size: 18px;
        }

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

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

        .px5cu-footer-links a {
            color: #bdc3c7;
            text-decoration: none;
            transition: var(--px5cu-transition);
        }

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

        .px5cu-copyright {
            text-align: center;
            padding-top: 40px;
            border-top: 1px solid rgba(255,255,255,0.05);
            font-size: 14px;
        }

        @media (max-width: 768px) {
            .px5cu-hero {
                padding: 120px 0 60px;
                text-align: center;
            }
            .px5cu-hero-content {
                justify-content: center;
            }
            .px5cu-hero-subtitle {
                margin-left: auto;
                margin-right: auto;
            }
            .px5cu-grid {
                grid-template-columns: 1fr;
            }
        }