:root {
            --px5cu-primary: #bf0000;
            --px5cu-primary-hover: #990000;
            --px5cu-dark: #2c3e50;
            --px5cu-light: #f8f9fa;
            --px5cu-text: #333333;
            --px5cu-text-muted: #666666;
            --px5cu-white: #ffffff;
            --px5cu-shadow: 0 10px 30px rgba(0,0,0,0.1);
            --px5cu-radius: 12px;
            --px5cu-container-width: 1300px;
        }

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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
            color: var(--px5cu-text);
            line-height: 1.7;
            background-color: var(--px5cu-white);
            overflow-x: hidden;
        }

        /* Typography */
        h1, h2, h3 {
            line-height: 1.3;
            word-break: keep-all;
            white-space: normal;
        }

        h1 { font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 800; margin-bottom: 24px; }
        h2 { font-size: clamp(1.5rem, 3vw, 2.5rem); font-weight: 700; margin-bottom: 32px; text-align: center; }
        h3 { font-size: clamp(1.2rem, 2vw, 1.8rem); font-weight: 600; margin-bottom: 16px; }
        p { margin-bottom: 16px; word-break: break-word; overflow-wrap: break-word; }

        /* Navigation */
        .px5cu-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: 0 2px 15px rgba(0,0,0,0.05);
        }

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

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

        .px5cu-logo img {
            height: 45px;
            width: auto;
            display: block;
        }

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

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

        .px5cu-nav-link:hover {
            color: var(--px5cu-primary);
            background: rgba(191, 0, 0, 0.05);
        }

        .px5cu-nav-link.px5cu-active {
            color: var(--px5cu-white);
            background: var(--px5cu-primary);
        }

        /* Hero Section */
        .px5cu-hero {
            position: relative;
            padding: 96px 24px;
            min-height: 85vh;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: center;
            background: url('images/hero_bg.jpg') no-repeat center center/cover;
            color: var(--px5cu-white);
        }

        .px5cu-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(0,0,0,0.85) 0%, rgba(0,0,0,0.4) 100%);
        }

        .px5cu-hero-content {
            position: relative;
            max-width: 900px;
            text-align: center;
            z-index: 2;
            min-width: 0;
        }

        .px5cu-hero-subtitle {
            font-size: clamp(1rem, 2vw + 0.5rem, 1.5rem);
            opacity: 0.9;
            margin-bottom: 48px;
        }

        .px5cu-btn {
            display: inline-block;
            padding: 16px 40px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 700;
            font-size: 18px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            cursor: pointer;
            border: none;
        }

        .px5cu-btn-primary {
            background: var(--px5cu-primary);
            color: var(--px5cu-white);
            box-shadow: 0 4px 15px rgba(191, 0, 0, 0.3);
        }

        .px5cu-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(191, 0, 0, 0.4);
            background: var(--px5cu-primary-hover);
        }

        /* Workflow Section */
        .px5cu-workflow {
            padding: 96px 24px;
            background: var(--px5cu-light);
        }

        .px5cu-workflow-grid {
            max-width: var(--px5cu-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
        }

        .px5cu-workflow-card {
            flex: 1 1 calc(33.333% - 32px);
            min-width: 300px;
            background: var(--px5cu-white);
            padding: 40px;
            border-radius: var(--px5cu-radius);
            box-shadow: var(--px5cu-shadow);
            transition: transform 0.3s ease;
            display: flex;
            flex-direction: column;
        }

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

        .px5cu-tag {
            display: inline-block;
            background: rgba(191, 0, 0, 0.1);
            color: var(--px5cu-primary);
            padding: 4px 12px;
            border-radius: 4px;
            font-size: 12px;
            font-weight: 700;
            margin-bottom: 16px;
            text-transform: uppercase;
        }

        .px5cu-boost {
            margin-top: auto;
            padding-top: 24px;
            border-top: 1px solid #eee;
            color: var(--px5cu-primary);
            font-weight: 700;
        }

        /* Feature Rows */
        .px5cu-feature-row {
            padding: 96px 24px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            max-width: var(--px5cu-container-width);
            margin: 0 auto;
            gap: 64px;
        }

        .px5cu-feature-row:nth-child(even) {
            flex-direction: row-reverse;
        }

        .px5cu-feature-image {
            flex: 1 1 500px;
            min-width: 0;
        }

        .px5cu-feature-image img {
            width: 100%;
            height: auto;
            border-radius: var(--px5cu-radius);
            box-shadow: var(--px5cu-shadow);
        }

        .px5cu-feature-text {
            flex: 1 1 400px;
            min-width: 0;
        }

        /* Emotional Connect Section */
        .px5cu-emotional {
            position: relative;
            padding: 120px 24px;
            text-align: center;
            color: var(--px5cu-white);
            background: url('images/emotional_connect.jpg') no-repeat center center/cover;
            background-attachment: fixed;
        }

        .px5cu-emotional::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(44, 62, 80, 0.7);
        }

        .px5cu-emotional-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
            margin: 0 auto;
        }

        /* Dynamic Section */
        .px5cu-dynamic-section {
            padding: 96px 24px;
            background: var(--px5cu-white);
            max-width: var(--px5cu-container-width);
            margin: 0 auto;
        }

        /* Footer */
        .px5cu-footer {
            background: var(--px5cu-dark);
            color: var(--px5cu-white);
            padding: 64px 24px;
        }

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

        .px5cu-footer-col {
            flex: 1 1 200px;
            min-width: 0;
        }

        .px5cu-footer-brand {
            font-size: 24px;
            font-weight: 800;
            margin-bottom: 16px;
            color: var(--px5cu-white);
        }

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

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

        .px5cu-footer-links a {
            color: #bdc3c7;
            text-decoration: none;
            transition: color 0.3s;
        }

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

        .px5cu-copyright {
            text-align: center;
            padding-top: 48px;
            margin-top: 48px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #7f8c8d;
            font-size: 14px;
        }

        /* Mobile Responsiveness */
        @media (max-width: 768px) {
            .px5cu-nav-container {
                height: auto;
                padding: 16px;
                justify-content: center;
            }
            .px5cu-nav-menu {
                margin-top: 16px;
                justify-content: center;
                gap: 8px;
            }
            .px5cu-nav-link {
                font-size: 12px;
                padding: 6px 10px;
            }
            .px5cu-feature-row {
                gap: 32px;
                text-align: center;
            }
            .px5cu-hero {
                padding: 64px 16px;
            }
        }