:root {
            --px5cu-primary: #bf0000;
            --px5cu-primary-dark: #8e0000;
            --px5cu-secondary: #1a2b3c;
            --px5cu-accent: #f8f9fa;
            --px5cu-text: #2d3436;
            --px5cu-text-light: #636e72;
            --px5cu-bg: #ffffff;
            --px5cu-card-bg: #ffffff;
            --px5cu-shadow: 0 12px 24px rgba(0,0,0,0.08);
            --px5cu-border-radius: 16px;
            --px5cu-container-width: 1320px;
            --px5cu-spacing-unit: 8px;
        }

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

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

        /* Fluid Typography */
        h1 { font-size: clamp(2.5rem, 5vw + 1rem, 4rem); line-height: 1.2; font-weight: 800; margin-bottom: 24px; white-space: normal; }
        h2 { font-size: clamp(1.8rem, 3vw + 0.5rem, 2.5rem); margin-bottom: 32px; white-space: normal; }
        h3 { font-size: clamp(1.2rem, 1.5vw + 0.5rem, 1.8rem); margin-bottom: 16px; white-space: normal; }
        p { font-size: clamp(1rem, 0.5vw + 0.8rem, 1.15rem); margin-bottom: 16px; word-break: keep-all; }

        /* Navigation */
        .px5cu-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(15px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }

        .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: 40px;
            display: block;
        }

        .px5cu-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 20px;
            min-width: 0;
        }

        .px5cu-nav-item a {
            text-decoration: none;
            color: var(--px5cu-secondary);
            font-weight: 500;
            font-size: 14px;
            padding: 8px 12px;
            border-radius: 8px;
            transition: all 0.2s ease;
        }

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

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

        /* Hero Section */
        .px5cu-hero {
            padding: 160px 24px 80px;
            background: radial-gradient(circle at top right, #fff5f5 0%, #ffffff 100%);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .px5cu-hero-inner {
            max-width: 900px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }

        .px5cu-hero-tag {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(191, 0, 0, 0.1);
            color: var(--px5cu-primary);
            border-radius: 50px;
            font-weight: 600;
            margin-bottom: 24px;
            font-size: 14px;
        }

        .px5cu-hero-subtitle {
            color: var(--px5cu-text-light);
            max-width: 700px;
            margin: 0 auto 48px;
        }

        /* Solutions Grid */
        .px5cu-section {
            padding: 96px 24px;
            max-width: var(--px5cu-container-width);
            margin: 0 auto;
        }

        .px5cu-solutions-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
            margin-top: 48px;
        }

        .px5cu-card {
            background: var(--px5cu-card-bg);
            padding: 40px;
            border-radius: var(--px5cu-border-radius);
            box-shadow: var(--px5cu-shadow);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: 1px solid rgba(0,0,0,0.03);
            min-width: 0;
            display: flex;
            flex-direction: column;
        }

        .px5cu-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.12);
        }

        .px5cu-step-num {
            font-size: 48px;
            font-weight: 900;
            color: rgba(191, 0, 0, 0.1);
            margin-bottom: -20px;
            line-height: 1;
        }

        .px5cu-code-block {
            background: #2d3436;
            color: #fab1a0;
            padding: 16px;
            border-radius: 8px;
            font-family: monospace;
            margin: 16px 0;
            font-size: 14px;
            overflow-x: auto;
        }

        /* Content Mix Section */
        .px5cu-split-row {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
            margin-bottom: 96px;
        }

        .px5cu-split-content {
            flex: 1 1 450px;
            min-width: 0;
        }

        .px5cu-split-visual {
            flex: 1 1 450px;
            min-width: 0;
            background: var(--px5cu-secondary);
            border-radius: var(--px5cu-border-radius);
            padding: 40px;
            color: white;
            position: relative;
        }

        .px5cu-status-indicator {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 24px;
        }

        .px5cu-dot {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: #00b894;
            box-shadow: 0 0 10px #00b894;
        }

        /* Enterprise Workflow */
        .px5cu-workflow-section {
            background: var(--px5cu-secondary);
            color: white;
            padding: 96px 24px;
            border-radius: 40px;
            margin: 40px 24px;
        }

        .px5cu-workflow-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
            max-width: var(--px5cu-container-width);
            margin: 48px auto 0;
        }

        .px5cu-workflow-item {
            border-left: 2px solid var(--px5cu-primary);
            padding: 0 0 0 24px;
            min-width: 0;
        }

        .px5cu-efficiency-badge {
            display: inline-block;
            padding: 4px 12px;
            background: var(--px5cu-primary);
            border-radius: 4px;
            font-size: 12px;
            margin-top: 12px;
        }

        /* Footer */
        .px5cu-footer {
            background: #f1f2f6;
            padding: 80px 24px;
            margin-top: 80px;
        }

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

        .px5cu-footer-brand {
            flex: 1 1 300px;
            min-width: 0;
        }

        .px5cu-footer-brand h4 {
            font-size: 24px;
            color: var(--px5cu-primary);
            margin-bottom: 16px;
        }

        .px5cu-footer-links {
            flex: 2 1 600px;
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            min-width: 0;
        }

        .px5cu-link-group {
            flex: 1 1 150px;
            min-width: 0;
        }

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

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

        .px5cu-link-group a {
            text-decoration: none;
            color: var(--px5cu-text-light);
            transition: color 0.2s;
        }

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

        .px5cu-copyright {
            width: 100%;
            padding-top: 40px;
            margin-top: 40px;
            border-top: 1px solid rgba(0,0,0,0.05);
            text-align: center;
            color: var(--px5cu-text-light);
            font-size: 14px;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .px5cu-nav-container { height: auto; padding: 16px 24px; }
            .px5cu-nav-menu { width: 100%; justify-content: center; margin-top: 16px; gap: 10px; }
        }

        @media (max-width: 768px) {
            .px5cu-hero { padding-top: 140px; }
            .px5cu-split-row { gap: 32px; flex-direction: column; }
            .px5cu-split-visual { width: 100%; }
        }