:root {
            --x7bg-primary: #FF6600;
            --x7bg-primary-light: #FF8533;
            --x7bg-dark: #1D1D1F;
            --x7bg-gray: #86868B;
            --x7bg-light-gray: #F5F5F7;
            --x7bg-white: #FFFFFF;
            --x7bg-accent: #0071E3;
            --x7bg-container-width: 1400px;
            --x7bg-gap-base: 8px;
        }

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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
            background-color: var(--x7bg-white);
            color: var(--x7bg-dark);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: break-word;
        }

        /* 导航栏设计：浮动胶囊样式 */
        .x7bg-nav-wrapper {
            position: fixed;
            top: 24px;
            left: 0;
            width: 100%;
            z-index: 1000;
            display: flex;
            justify-content: center;
            padding: 0 24px;
        }

        .x7bg-nav-container {
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(20px);
            border: 1px solid rgba(0, 0, 0, 0.05);
            border-radius: 40px;
            padding: 8px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: 1100px;
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.05);
            flex-wrap: wrap;
        }

        .x7bg-logo {
            display: flex;
            align-items: center;
            min-width: 0;
        }

        .x7bg-logo img {
            height: 32px;
            width: auto;
        }

        .x7bg-menu {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            list-style: none;
            min-width: 0;
        }

        .x7bg-menu li a {
            text-decoration: none;
            color: var(--x7bg-dark);
            font-size: 14px;
            font-weight: 500;
            transition: color 0.3s;
            padding: 8px 4px;
        }

        .x7bg-menu li a:hover {
            color: var(--x7bg-primary);
        }

        /* Hero Review 独特布局：数据实验室风格 */
        .x7bg-hero-review {
            min-height: 90vh;
            padding: 160px 5vw 80px;
            background: radial-gradient(circle at top right, #FFF5EE 0%, #FFFFFF 50%);
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: center;
            position: relative;
        }

        .x7bg-hero-content {
            flex: 1;
            min-width: 320px;
            max-width: 700px;
            text-align: center;
        }

        .x7bg-badge {
            display: inline-block;
            background: rgba(255, 102, 0, 0.1);
            color: var(--x7bg-primary);
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 24px;
            letter-spacing: 1px;
        }

        .x7bg-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
            line-height: 1.1;
            font-weight: 800;
            color: var(--x7bg-dark);
            margin-bottom: 24px;
            word-break: keep-all;
        }

        .x7bg-hero-subtitle {
            font-size: clamp(1.1rem, 1vw + 0.8rem, 1.5rem);
            color: var(--x7bg-gray);
            max-width: 600px;
            margin: 0 auto 48px;
            line-height: 1.6;
        }

        /* 核心评测数据展示：网格布局 */
        .x7bg-metric-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 32px;
            width: 100%;
            max-width: var(--x7bg-container-width);
            margin: 80px auto;
            padding: 0 24px;
        }

        .x7bg-metric-card {
            background: var(--x7bg-light-gray);
            padding: 48px;
            border-radius: 32px;
            transition: transform 0.4s cubic-bezier(0.2, 0, 0, 1);
            position: relative;
            overflow: hidden;
            min-width: 0;
        }

        .x7bg-metric-card:hover {
            transform: translateY(-10px);
            background: var(--x7bg-white);
            box-shadow: 0 20px 40px rgba(0,0,0,0.05);
        }

        .x7bg-metric-value {
            font-size: 64px;
            font-weight: 800;
            color: var(--x7bg-primary);
            margin-bottom: 16px;
            display: flex;
            align-items: baseline;
        }

        .x7bg-metric-value span {
            font-size: 24px;
            margin-left: 4px;
        }

        .x7bg-metric-label {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 12px;
            color: var(--x7bg-dark);
        }

        .x7bg-metric-desc {
            color: var(--x7bg-gray);
            font-size: 16px;
        }

        /* 场景深度解析：交错布局 */
        .x7bg-scenario-section {
            padding: 96px 24px;
            max-width: var(--x7bg-container-width);
            margin: 0 auto;
        }

        .x7bg-scenario-row {
            display: flex;
            flex-wrap: wrap;
            gap: 64px;
            align-items: center;
            margin-bottom: 120px;
        }

        .x7bg-scenario-row:nth-child(even) {
            flex-direction: row-reverse;
        }

        .x7bg-scenario-info {
            flex: 1;
            min-width: 320px;
        }

        .x7bg-scenario-tag {
            font-size: 14px;
            color: var(--x7bg-accent);
            text-transform: uppercase;
            font-weight: 700;
            margin-bottom: 16px;
            display: block;
        }

        .x7bg-scenario-title {
            font-size: clamp(2rem, 3vw, 2.8rem);
            font-weight: 700;
            margin-bottom: 24px;
            line-height: 1.2;
        }

        .x7bg-tool-list {
            list-style: none;
            margin-bottom: 32px;
        }

        .x7bg-tool-item {
            background: var(--x7bg-light-gray);
            margin-bottom: 12px;
            padding: 16px 20px;
            border-radius: 12px;
            font-weight: 500;
            border-left: 4px solid var(--x7bg-primary);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        /* 动态内容区块 */
        .x7bg-dynamic-section {
            background: var(--x7bg-dark);
            color: var(--x7bg-white);
            padding: 96px 24px;
        }

        .x7bg-section-header {
            text-align: center;
            margin-bottom: 64px;
        }

        .x7bg-section-header h2 {
            font-size: 36px;
            margin-bottom: 16px;
        }

        .x7bg-article-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
            gap: 24px;
            max-width: var(--x7bg-container-width);
            margin: 0 auto;
        }

        .x7bg-article-card {
            border: 1px solid rgba(255, 255, 255, 0.1);
            padding: 32px;
            border-radius: 24px;
            transition: all 0.3s;
        }

        .x7bg-article-card:hover {
            background: rgba(255, 255, 255, 0.05);
            border-color: var(--x7bg-primary);
        }

        /* 页脚 */
        .x7bg-footer {
            padding: 80px 24px 40px;
            background: var(--x7bg-white);
            border-top: 1px solid var(--x7bg-light-gray);
        }

        .x7bg-footer-content {
            max-width: var(--x7bg-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
        }

        .x7bg-footer-brand h3 {
            font-size: 24px;
            color: var(--x7bg-primary);
            margin-bottom: 16px;
        }

        .x7bg-footer-links {
            display: flex;
            gap: 64px;
            flex-wrap: wrap;
        }

        .x7bg-footer-group h4 {
            margin-bottom: 20px;
            font-size: 16px;
        }

        .x7bg-footer-group ul {
            list-style: none;
        }

        .x7bg-footer-group ul li {
            margin-bottom: 10px;
        }

        .x7bg-footer-group ul li a {
            text-decoration: none;
            color: var(--x7bg-gray);
            font-size: 14px;
            transition: color 0.3s;
        }

        .x7bg-footer-group ul li a:hover {
            color: var(--x7bg-primary);
        }

        .x7bg-copyright {
            text-align: center;
            margin-top: 64px;
            padding-top: 24px;
            border-top: 1px solid var(--x7bg-light-gray);
            color: var(--x7bg-gray);
            font-size: 12px;
            width: 100%;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .x7bg-nav-container {
                border-radius: 20px;
                padding: 8px 16px;
            }
            .x7bg-menu {
                display: none; /* 简化移动端，实际项目中可加汉堡菜单 */
            }
            .x7bg-hero-review {
                padding-top: 120px;
            }
            .x7bg-metric-grid {
                grid-template-columns: 1fr;
            }
            .x7bg-scenario-row {
                margin-bottom: 64px;
            }
        }

        /* 装饰性背景元素 */
        .x7bg-blob {
            position: absolute;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(255, 102, 0, 0.05) 0%, rgba(255, 255, 255, 0) 70%);
            z-index: -1;
            border-radius: 50%;
        }