:root {
            --ucchpb-primary: #FF7139;
            --ucchpb-secondary: #0060DF;
            --ucchpb-accent: #8000FF;
            --ucchpb-dark: #0b0b20;
            --ucchpb-light: #f9f9fb;
            --ucchpb-text: #20123a;
            --ucchpb-gray: #5b5b66;
            --ucchpb-spacing-unit: 8px;
            --ucchpb-container-width: 90vw;
            --ucchpb-max-w: 1400px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
            background-color: var(--ucchpb-light);
            color: var(--ucchpb-text);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: break-word;
        }

        /* 布局基础 */
        .ucchpb-flex { display: flex; flex-wrap: wrap; }
        .ucchpb-grid { display: grid; gap: calc(var(--ucchpb-spacing-unit) * 4); }
        .ucchpb-container {
            width: var(--ucchpb-container-width);
            max-width: var(--ucchpb-max-w);
            margin: 0 auto;
            padding: 0 calc(var(--ucchpb-spacing-unit) * 2);
        }

        /* 导航栏 */
        .ucchpb-header {
            position: fixed;
            top: 20px;
            left: 50%;
            transform: translateX(-50%);
            width: 95%;
            max-width: 1200px;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(12px);
            border-radius: 50px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.3);
            padding: 10px 24px;
        }

        .ucchpb-nav-wrap {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            min-width: 0;
        }

        .ucchpb-logo {
            flex: 0 0 auto;
            display: flex;
            align-items: center;
        }

        .ucchpb-logo img {
            height: 36px;
            width: auto;
        }

        .ucchpb-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 12px;
            min-width: 0;
        }

        .ucchpb-menu li a {
            text-decoration: none;
            color: var(--ucchpb-text);
            font-weight: 500;
            font-size: 14px;
            padding: 8px 16px;
            border-radius: 20px;
            transition: all 0.3s ease;
            white-space: nowrap;
        }

        .ucchpb-menu li a:hover {
            color: var(--ucchpb-primary);
            background: rgba(255, 113, 57, 0.1);
        }

        .ucchpb-menu li a.ucchpb-active {
            background: var(--ucchpb-primary);
            color: #fff;
        }

        /* Hero 区 - 非对称创意布局 */
        .ucchpb-hero {
            padding-top: 140px;
            padding-bottom: 80px;
            background: linear-gradient(135deg, #fff 0%, #f0f4ff 100%);
            position: relative;
            overflow: hidden;
        }

        .ucchpb-hero::after {
            content: '';
            position: absolute;
            bottom: -50px;
            right: -50px;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(255, 113, 57, 0.1) 0%, transparent 70%);
            z-index: 0;
        }

        .ucchpb-hero-content {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            position: relative;
            z-index: 1;
        }

        .ucchpb-hero-text {
            flex: 1;
            min-width: 320px;
            padding-right: 48px;
        }

        .ucchpb-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
            line-height: 1.1;
            font-weight: 800;
            margin-bottom: 24px;
            background: linear-gradient(90deg, var(--ucchpb-text), var(--ucchpb-secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            word-break: keep-all;
        }

        .ucchpb-hero-subtitle {
            font-size: clamp(1.1rem, 2vw + 0.5rem, 1.4rem);
            color: var(--ucchpb-gray);
            margin-bottom: 40px;
            max-width: 600px;
        }

        .ucchpb-hero-visual {
            flex: 1.2;
            min-width: 320px;
            position: relative;
        }

        .ucchpb-hero-img-card {
            border-radius: 24px;
            overflow: hidden;
            box-shadow: 20px 40px 80px rgba(0, 0, 0, 0.15);
            transform: perspective(1000px) rotateY(-5deg);
            transition: transform 0.5s ease;
        }

        .ucchpb-hero-img-card:hover {
            transform: perspective(1000px) rotateY(0deg);
        }

        .ucchpb-hero-img-card img {
            width: 100%;
            display: block;
        }

        /* 隐私盾区块 - Bento Grid 风格 */
        .ucchpb-section {
            padding: 96px 0;
        }

        .ucchpb-section-title {
            text-align: center;
            font-size: clamp(2rem, 3vw + 0.5rem, 3rem);
            margin-bottom: 64px;
            font-weight: 700;
        }

        .ucchpb-privacy-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 32px;
        }

        .ucchpb-privacy-card {
            background: #fff;
            padding: 40px;
            border-radius: 24px;
            border: 1px solid rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .ucchpb-privacy-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.05);
            border-color: var(--ucchpb-primary);
        }

        .ucchpb-card-tag {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(0, 96, 223, 0.1);
            color: var(--ucchpb-secondary);
            border-radius: 8px;
            font-size: 12px;
            font-weight: 700;
            margin-bottom: 16px;
            text-transform: uppercase;
        }

        .ucchpb-card-name {
            font-size: 24px;
            margin-bottom: 16px;
            color: var(--ucchpb-text);
        }

        .ucchpb-card-list {
            list-style: none;
            margin-top: 20px;
        }

        .ucchpb-card-list li {
            padding: 8px 0;
            font-size: 14px;
            color: var(--ucchpb-gray);
            border-top: 1px solid #f0f0f0;
            display: flex;
            align-items: center;
        }

        .ucchpb-card-list li::before {
            content: '✓';
            color: #10b981;
            margin-right: 10px;
            font-weight: bold;
        }

        /* 性能对比区块 - 左右交叉 */
        .ucchpb-performance {
            background: var(--ucchpb-dark);
            color: #fff;
            border-radius: 48px;
            margin: 40px 0;
            padding: 80px 0;
            overflow: hidden;
        }

        .ucchpb-split-row {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
        }

        .ucchpb-split-text {
            flex: 1;
            min-width: 300px;
        }

        .ucchpb-split-visual {
            flex: 1.2;
            min-width: 300px;
        }

        .ucchpb-split-visual img {
            width: 100%;
            border-radius: 20px;
            filter: contrast(1.1);
        }

        .ucchpb-btn {
            display: inline-block;
            padding: 16px 32px;
            background: var(--ucchpb-primary);
            color: #fff;
            text-decoration: none;
            border-radius: 12px;
            font-weight: 600;
            transition: all 0.3s ease;
            margin-top: 32px;
            border: none;
            cursor: pointer;
        }

        .ucchpb-btn:hover {
            transform: scale(1.05);
            box-shadow: 0 10px 20px rgba(255, 113, 57, 0.3);
        }

        /* 生态与同步 - 交错卡片 */
        .ucchpb-eco-sync {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
            gap: 40px;
            margin-top: 64px;
        }

        .ucchpb-feature-box {
            background: #fff;
            border-radius: 32px;
            padding: 48px;
            position: relative;
            overflow: hidden;
            border: 1px solid #eee;
        }

        .ucchpb-feature-box img {
            width: 100%;
            margin-top: 32px;
            border-radius: 16px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        }

        /* 动态区块 */
        .ucchpb-dynamic-feed {
            background: #fff;
            padding: 40px;
            border-radius: 24px;
            margin-top: 80px;
            border: 2px dashed #ddd;
        }

        /* 页脚 */
        .ucchpb-footer {
            background: #f4f4f7;
            padding: 80px 0 40px;
            margin-top: 80px;
        }

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

        .ucchpb-footer-brand h2 {
            font-size: 24px;
            margin-bottom: 16px;
            color: var(--ucchpb-primary);
        }

        .ucchpb-footer-links h4 {
            margin-bottom: 24px;
            font-size: 16px;
        }

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

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

        .ucchpb-footer-links a {
            text-decoration: none;
            color: var(--ucchpb-gray);
            font-size: 14px;
            transition: color 0.3s;
        }

        .ucchpb-footer-links a:hover {
            color: var(--ucchpb-secondary);
        }

        .ucchpb-bottom {
            padding-top: 32px;
            border-top: 1px solid #e0e0e0;
            text-align: center;
            font-size: 13px;
            color: #999;
        }

        /* 响应式适配 */
        @media (max-width: 768px) {
            .ucchpb-header {
                top: 0;
                width: 100%;
                border-radius: 0;
            }
            .ucchpb-menu {
                display: none; /* 简化移动端处理，实际项目中会加汉堡菜单 */
            }
            .ucchpb-hero-text {
                padding-right: 0;
                text-align: center;
                margin-bottom: 48px;
            }
            .ucchpb-hero-visual {
                transform: none;
            }
            .ucchpb-hero-img-card {
                transform: none;
            }
            .ucchpb-section {
                padding: 64px 0;
            }
            .ucchpb-eco-sync {
                grid-template-columns: 1fr;
            }
        }