:root {
            --px5cu-primary: #bf0000;
            --px5cu-primary-dark: #8e0000;
            --px5cu-bg-light: #f8f9fa;
            --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 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

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

        /* 布局容器 */
        .px5cu-container {
            max-width: 1300px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* 导航栏 */
        .px5cu-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(15px);
            z-index: 1000;
            box-shadow: 0 2px 20px rgba(0,0,0,0.05);
            border-bottom: 1px solid rgba(0,0,0,0.05);
        }

        .px5cu-nav-wrapper {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 12px 0;
            min-height: 70px;
        }

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

        .px5cu-logo img {
            height: 42px;
            width: auto;
            display: block;
        }

        .px5cu-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 4px;
        }

        .px5cu-nav-item a {
            text-decoration: none;
            color: var(--px5cu-text-main);
            padding: 8px 16px;
            font-size: clamp(0.9rem, 1vw + 0.2rem, 1rem);
            font-weight: 500;
            border-radius: 6px;
            transition: var(--px5cu-transition);
            word-break: keep-all;
        }

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

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

        /* 独特Hero区：仪表盘风格 */
        .px5cu-hero {
            padding: 160px 0 100px;
            background: linear-gradient(135deg, #1a1a1a 0%, #2d3436 100%);
            color: var(--px5cu-white);
            position: relative;
            overflow: hidden;
            text-align: center;
        }

        .px5cu-hero::after {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 40%;
            height: 100%;
            background: radial-gradient(circle, rgba(191,0,0,0.1) 0%, transparent 70%);
            pointer-events: none;
        }

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

        .px5cu-hero-title {
            font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 24px;
            word-break: keep-all;
            background: linear-gradient(to right, #fff, #ccc);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .px5cu-hero-subtitle {
            font-size: clamp(1.1rem, 1.5vw + 0.5rem, 1.4rem);
            opacity: 0.9;
            margin-bottom: 40px;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        /* 核心内容区 */
        .px5cu-main-section {
            padding: 80px 0;
        }

        .px5cu-section-header {
            margin-bottom: 48px;
            border-left: 6px solid var(--px5cu-primary);
            padding-left: 24px;
        }

        .px5cu-section-title {
            font-size: clamp(1.5rem, 2.5vw + 0.5rem, 2.2rem);
            margin-bottom: 8px;
            color: #1a1a1a;
        }

        /* 代理类型网格 */
        .px5cu-proxy-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
            margin-bottom: 64px;
        }

        .px5cu-proxy-card {
            background: var(--px5cu-white);
            padding: 40px;
            border-radius: 16px;
            box-shadow: var(--px5cu-shadow);
            transition: var(--px5cu-transition);
            border: 1px solid rgba(0,0,0,0.03);
            min-width: 0;
        }

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

        .px5cu-card-tag {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(191,0,0,0.1);
            color: var(--px5cu-primary);
            font-size: 0.85rem;
            font-weight: 700;
            border-radius: 20px;
            margin-bottom: 20px;
        }

        .px5cu-proxy-card h3 {
            font-size: 1.5rem;
            margin-bottom: 16px;
            color: #2d3436;
        }

        .px5cu-proxy-card p {
            color: var(--px5cu-text-muted);
            font-size: 1rem;
            line-height: 1.8;
        }

        /* 企业工作流展示 */
        .px5cu-workflow-area {
            background: #fff;
            padding: 64px 40px;
            border-radius: 24px;
            box-shadow: inset 0 0 50px rgba(0,0,0,0.02);
        }

        .px5cu-workflow-item {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            padding: 40px 0;
            border-bottom: 1px dashed #eee;
        }

        .px5cu-workflow-item:last-child {
            border-bottom: none;
        }

        .px5cu-workflow-info {
            flex: 1;
            min-width: 300px;
        }

        .px5cu-workflow-meta {
            flex: 0 0 280px;
            min-width: 0;
            background: var(--px5cu-bg-light);
            padding: 24px;
            border-radius: 12px;
        }

        .px5cu-workflow-label {
            font-size: 0.8rem;
            color: var(--px5cu-text-muted);
            text-transform: uppercase;
            letter-spacing: 1px;
            display: block;
            margin-bottom: 4px;
        }

        .px5cu-workflow-value {
            font-weight: 700;
            color: var(--px5cu-primary);
            margin-bottom: 16px;
            display: block;
        }

        /* 步骤条 */
        .px5cu-step-container {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            margin-top: 40px;
        }

        .px5cu-step-box {
            flex: 1;
            min-width: 240px;
            padding: 32px;
            background: var(--px5cu-bg-light);
            border-radius: 12px;
            position: relative;
        }

        .px5cu-step-num {
            position: absolute;
            top: 20px;
            right: 20px;
            font-size: 3rem;
            font-weight: 900;
            color: rgba(191,0,0,0.05);
            line-height: 1;
        }

        /* 底部 */
        .px5cu-footer {
            background: #1a1a1a;
            color: rgba(255,255,255,0.7);
            padding: 80px 0 40px;
            font-size: 0.95rem;
        }

        .px5cu-footer-grid {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
            margin-bottom: 64px;
        }

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

        .px5cu-footer-brand h2 {
            color: var(--px5cu-white);
            margin-bottom: 20px;
            font-size: 1.8rem;
        }

        .px5cu-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 64px;
        }

        .px5cu-link-group h4 {
            color: var(--px5cu-white);
            margin-bottom: 24px;
            font-size: 1.1rem;
        }

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

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

        .px5cu-link-group a {
            color: rgba(255,255,255,0.5);
            text-decoration: none;
            transition: var(--px5cu-transition);
        }

        .px5cu-link-group a:hover {
            color: var(--px5cu-primary);
            padding-left: 5px;
        }

        .px5cu-copyright {
            text-align: center;
            padding-top: 40px;
            border-top: 1px solid rgba(255,255,255,0.05);
            font-size: 0.85rem;
        }

        /* 响应式调整 */
        @media (max-width: 992px) {
            .px5cu-nav-menu {
                justify-content: center;
                width: 100%;
                margin-top: 15px;
            }
        }

        @media (max-width: 768px) {
            .px5cu-hero { padding: 120px 0 60px; }
            .px5cu-proxy-grid { grid-template-columns: 1fr; }
            .px5cu-workflow-meta { flex: 1 1 100%; }
            .px5cu-footer-links { gap: 32px; }
        }

        /* 实用类 */
        .px5cu-text-primary { color: var(--px5cu-primary); }
        .px5cu-mb-16 { margin-bottom: 16px; }
        .px5cu-mt-32 { margin-top: 32px; }
        
        /* 交互增强 */
        .px5cu-btn {
            display: inline-block;
            padding: 14px 32px;
            background: var(--px5cu-primary);
            color: white;
            text-decoration: none;
            border-radius: 50px;
            font-weight: 600;
            transition: var(--px5cu-transition);
            border: none;
            cursor: pointer;
            box-shadow: 0 4px 15px rgba(191,0,0,0.3);
        }
        
        .px5cu-btn:hover {
            background: var(--px5cu-primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(191,0,0,0.4);
        }