:root {
            --x7bg-primary: #ff4d4f;
            --x7bg-secondary: #1890ff;
            --x7bg-dark: #1f1f1f;
            --x7bg-light: #f5f5f5;
            --x7bg-accent: #ff7a45;
            --x7bg-text-main: #262626;
            --x7bg-text-sub: #595959;
            --x7bg-bg-gradient: linear-gradient(135deg, #fff1f0 0%, #e6f7ff 100%);
            --x7bg-radius: 16px;
            --x7bg-container-width: 1100px;
        }

        * {
            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: #fff;
            color: var(--x7bg-text-main);
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* 导航栏 */
        .x7bg-navbar {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }

        .x7bg-nav-container {
            max-width: var(--x7bg-container-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 72px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
        }

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

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

        .x7bg-nav-links {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 20px;
            min-width: 0;
        }

        .x7bg-nav-links a {
            text-decoration: none;
            color: var(--x7bg-text-main);
            font-weight: 500;
            font-size: 14px;
            transition: color 0.3s;
            word-break: keep-all;
        }

        .x7bg-nav-links a:hover {
            color: var(--x7bg-primary);
        }

        /* Hero 区域 - 独特对角线布局 */
        .x7bg-hero {
            position: relative;
            padding-top: 140px;
            padding-bottom: 96px;
            background: var(--x7bg-bg-gradient);
            overflow: hidden;
        }

        .x7bg-hero::after {
            content: '';
            position: absolute;
            bottom: -50px;
            left: 0;
            width: 100%;
            height: 100px;
            background: #fff;
            transform: skewY(-2deg);
        }

        .x7bg-hero-inner {
            max-width: var(--x7bg-container-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            min-width: 0;
        }

        .x7bg-hero-content {
            flex: 1;
            min-width: 320px;
            word-break: break-word;
            padding-right: 48px;
        }

        .x7bg-hero-title {
            font-size: clamp(2.5rem, 5vw, 4rem);
            line-height: 1.1;
            font-weight: 800;
            margin-bottom: 24px;
            background: linear-gradient(90deg, #ff4d4f, #ff7a45);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            word-break: keep-all;
        }

        .x7bg-hero-subtitle {
            font-size: clamp(1.1rem, 2vw, 1.4rem);
            color: var(--x7bg-text-sub);
            margin-bottom: 40px;
            max-width: 600px;
            line-height: 1.8;
        }

        .x7bg-hero-visual {
            flex: 1;
            min-width: 320px;
            display: flex;
            justify-content: center;
            position: relative;
        }

        /* 模拟皮肤卡片堆叠效果 */
        .x7bg-skin-stack {
            position: relative;
            width: 100%;
            max-width: 450px;
            height: 300px;
        }

        .x7bg-skin-card-mock {
            position: absolute;
            width: 100%;
            height: 100%;
            background: #fff;
            border-radius: var(--x7bg-radius);
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
            display: flex;
            flex-direction: column;
            padding: 24px;
            border: 1px solid rgba(0,0,0,0.05);
            transition: transform 0.5s ease;
        }

        .x7bg-skin-card-mock:nth-child(1) { transform: rotate(-5deg) translate(-20px, 0); z-index: 1; }
        .x7bg-skin-card-mock:nth-child(2) { transform: rotate(5deg) translate(20px, 10px); z-index: 2; border-color: var(--x7bg-primary); }
        .x7bg-skin-card-mock:hover { transform: translateY(-10px) rotate(0); z-index: 10; }

        .x7bg-btn-primary {
            display: inline-block;
            padding: 16px 40px;
            background: var(--x7bg-primary);
            color: #fff;
            text-decoration: none;
            border-radius: 50px;
            font-weight: 600;
            font-size: 18px;
            box-shadow: 0 8px 24px rgba(255, 77, 79, 0.3);
            transition: all 0.3s ease;
        }

        .x7bg-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 32px rgba(255, 77, 79, 0.4);
        }

        /* 皮肤分类下载区 */
        .x7bg-section {
            padding: 96px 0;
            max-width: var(--x7bg-container-width);
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

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

        .x7bg-section-title {
            font-size: clamp(1.8rem, 3vw, 2.5rem);
            font-weight: 700;
            margin-bottom: 16px;
        }

        /* 场景化效率区块 */
        .x7bg-efficiency-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            min-width: 0;
        }

        .x7bg-efficiency-card {
            flex: 1;
            min-width: 300px;
            background: #fff;
            padding: 40px;
            border-radius: var(--x7bg-radius);
            border: 1px solid #eee;
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .x7bg-efficiency-card:hover {
            border-color: var(--x7bg-primary);
            box-shadow: 0 16px 48px rgba(0,0,0,0.08);
            transform: translateY(-8px);
        }

        .x7bg-scenario-tag {
            display: inline-block;
            padding: 4px 12px;
            background: #fff1f0;
            color: var(--x7bg-primary);
            border-radius: 4px;
            font-size: 12px;
            font-weight: 600;
            margin-bottom: 20px;
        }

        .x7bg-efficiency-num {
            font-size: 48px;
            font-weight: 800;
            color: var(--x7bg-primary);
            margin: 24px 0;
        }

        .x7bg-tool-list {
            list-style: none;
            margin-top: 16px;
        }

        .x7bg-tool-list li {
            font-size: 14px;
            color: var(--x7bg-text-sub);
            margin-bottom: 12px;
            padding-left: 20px;
            position: relative;
        }

        .x7bg-tool-list li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--x7bg-primary);
        }

        /* 皮肤模拟展示区 */
        .x7bg-skin-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
            gap: 24px;
            margin-top: 48px;
        }

        .x7bg-skin-item {
            background: #f9f9f9;
            border-radius: 12px;
            overflow: hidden;
            transition: all 0.3s ease;
            position: relative;
        }

        .x7bg-skin-thumb {
            aspect-ratio: 16/10;
            background: #ddd;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
            background: linear-gradient(45deg, #eee, #f5f5f5);
        }

        .x7bg-skin-info {
            padding: 16px;
        }

        .x7bg-skin-name {
            font-weight: 600;
            font-size: 16px;
            margin-bottom: 4px;
        }

        .x7bg-skin-author {
            font-size: 12px;
            color: var(--x7bg-text-sub);
        }

        /* 动态资讯区块标记 */
        .x7bg-news-section {
            background: #fafafa;
            padding: 80px 0;
            margin-top: 64px;
        }

        .x7bg-news-container {
            max-width: var(--x7bg-container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 页脚 */
        .x7bg-footer {
            background: var(--x7bg-dark);
            color: #fff;
            padding: 80px 0 40px;
        }

        .x7bg-footer-inner {
            max-width: var(--x7bg-container-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            justify-content: space-between;
        }

        .x7bg-footer-brand {
            flex: 0 0 300px;
            min-width: 0;
        }

        .x7bg-footer-brand h2 {
            font-size: 24px;
            margin-bottom: 20px;
            color: #fff;
        }

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

        .x7bg-footer-col h4 {
            font-size: 16px;
            margin-bottom: 24px;
            color: rgba(255,255,255,0.5);
        }

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

        .x7bg-footer-col ul li {
            margin-bottom: 12px;
        }

        .x7bg-footer-col ul li a {
            color: rgba(255,255,255,0.8);
            text-decoration: none;
            font-size: 14px;
            transition: color 0.3s;
        }

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

        .x7bg-copyright {
            text-align: center;
            padding-top: 64px;
            margin-top: 64px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 12px;
            color: rgba(255,255,255,0.4);
        }

        /* 响应式适配 */
        @media (max-width: 768px) {
            .x7bg-nav-links {
                display: none; /* 简化移动端，实际开发中应有汉堡菜单 */
            }

            .x7bg-hero {
                padding-top: 100px;
                padding-bottom: 64px;
                text-align: center;
            }

            .x7bg-hero-content {
                padding-right: 0;
                margin-bottom: 48px;
            }

            .x7bg-hero-visual {
                padding: 0 20px;
            }

            .x7bg-efficiency-card {
                padding: 24px;
            }

            .x7bg-footer-inner {
                flex-direction: column;
                gap: 32px;
            }
        }