/* 基础重置与变量 */
        :root {
            --sjb5-primary: #ff4d4f;
            --sjb5-primary-hover: #ff7875;
            --sjb5-accent: #1890ff;
            --sjb5-text-main: #262626;
            --sjb5-text-sub: #595959;
            --sjb5-bg-light: #f5f5f5;
            --sjb5-white: #ffffff;
            --sjb5-shadow: 0 8px 32px rgba(0,0,0,0.08);
            --sjb5-radius: 16px;
            --sjb5-max-width: 1400px;
            --sjb5-gap: 8px;
        }

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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--sjb5-text-main);
            line-height: 1.6;
            background-color: var(--sjb5-white);
            overflow-x: hidden;
            word-break: keep-all;
        }

        /* 导航栏 */
        .sjb5-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(15px);
            z-index: 1000;
            border-bottom: 1px solid rgba(0,0,0,0.05);
            padding: 16px 0;
        }

        .sjb5-nav-container {
            max-width: var(--sjb5-max-width);
            margin: 0 auto;
            padding: 0 48px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
        }

        .sjb5-logo {
            flex: 0 0 auto;
            min-width: 0;
        }

        .sjb5-logo img {
            height: 32px;
            display: block;
        }

        .sjb5-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 24px;
            min-width: 0;
        }

        .sjb5-menu li a {
            text-decoration: none;
            color: var(--sjb5-text-main);
            font-size: 15px;
            font-weight: 500;
            transition: color 0.3s;
        }

        .sjb5-menu li a:hover {
            color: var(--sjb5-primary);
        }

        /* Hero 区 - 对角线分割布局 */
        .sjb5-hero {
            position: relative;
            padding: 160px 48px 96px;
            background: linear-gradient(135deg, #fffcfc 0%, #fff0f0 100%);
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            align-items: center;
            overflow: hidden;
        }

        .sjb5-hero-content {
            flex: 1;
            min-width: 320px;
            max-width: 800px;
            text-align: center;
            position: relative;
            z-index: 2;
        }

        .sjb5-hero-tag {
            display: inline-block;
            background: var(--sjb5-primary);
            color: white;
            padding: 4px 16px;
            border-radius: 20px;
            font-size: 14px;
            margin-bottom: 24px;
            letter-spacing: 1px;
        }

        .sjb5-hero h1 {
            font-size: clamp(2.5rem, 5vw + 1rem, 4rem);
            line-height: 1.2;
            margin-bottom: 24px;
            color: #1a1a1a;
            font-weight: 800;
        }

        .sjb5-hero p {
            font-size: clamp(1.1rem, 2vw + 0.5rem, 1.4rem);
            color: var(--sjb5-text-sub);
            margin-bottom: 48px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        /* 核心对比区 - 独特卡片式布局 */
        .sjb5-vs-section {
            padding: 96px 48px;
            max-width: var(--sjb5-max-width);
            margin: 0 auto;
        }

        .sjb5-section-title {
            text-align: center;
            margin-bottom: 64px;
        }

        .sjb5-section-title h2 {
            font-size: clamp(2rem, 3vw + 0.5rem, 2.5rem);
            margin-bottom: 16px;
        }

        .sjb5-vs-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
            flex-wrap: wrap;
        }

        .sjb5-vs-card {
            background: var(--sjb5-white);
            border: 1px solid rgba(0,0,0,0.05);
            border-radius: var(--sjb5-radius);
            padding: 48px;
            transition: transform 0.3s, box-shadow 0.3s;
            min-width: 0;
        }

        .sjb5-vs-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--sjb5-shadow);
        }

        .sjb5-vs-card.sjb5-featured {
            background: linear-gradient(180deg, #ffffff 0%, #fff9f9 100%);
            border: 2px solid var(--sjb5-primary);
        }

        .sjb5-vs-header {
            margin-bottom: 32px;
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .sjb5-brand-dot {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--sjb5-primary);
        }

        .sjb5-vs-card h3 {
            font-size: 24px;
            margin-bottom: 16px;
        }

        .sjb5-vs-list {
            list-style: none;
        }

        .sjb5-vs-list li {
            padding: 12px 0;
            border-bottom: 1px dashed rgba(0,0,0,0.1);
            color: var(--sjb5-text-sub);
            display: flex;
            justify-content: space-between;
        }

        /* AI灵感中心 - 模块化展示 */
        .sjb5-ai-center {
            background: #111;
            color: #fff;
            padding: 96px 48px;
            border-radius: 40px;
            margin: 0 48px 96px;
        }

        .sjb5-ai-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            margin-top: 64px;
        }

        .sjb5-ai-module {
            flex: 1;
            min-width: 300px;
        }

        .sjb5-ai-module h4 {
            font-size: 28px;
            color: var(--sjb5-primary);
            margin-bottom: 32px;
            border-left: 4px solid var(--sjb5-primary);
            padding-left: 16px;
        }

        .sjb5-tool-card {
            background: rgba(255,255,255,0.05);
            padding: 24px;
            border-radius: 12px;
            margin-bottom: 16px;
            transition: background 0.3s;
        }

        .sjb5-tool-card:hover {
            background: rgba(255,255,255,0.1);
        }

        .sjb5-tool-name {
            font-weight: 700;
            display: block;
            margin-bottom: 8px;
            color: #fff;
        }

        .sjb5-tool-usage {
            font-size: 14px;
            color: #aaa;
            display: block;
            margin-bottom: 12px;
        }

        .sjb5-tool-action {
            font-size: 15px;
            line-height: 1.5;
            color: #eee;
        }

        /* 视觉语义层 - 横向展示 */
        .sjb5-visual-layer {
            padding: 96px 48px;
            max-width: var(--sjb5-max-width);
            margin: 0 auto;
        }

        .sjb5-skin-showcase {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            margin-top: 48px;
        }

        .sjb5-skin-item {
            flex: 1;
            min-width: 260px;
            background: var(--sjb5-bg-light);
            padding: 32px;
            border-radius: var(--sjb5-radius);
            text-align: center;
        }

        .sjb5-skin-item span {
            display: block;
            font-weight: 600;
            font-size: 18px;
            color: var(--sjb5-text-main);
        }

        /* 动态内容标记区 */
        .sjb5-news-section {
            padding: 96px 48px;
            background: #fffafa;
        }

        /* 页脚 */
        .sjb5-footer {
            background: #fafafa;
            padding: 80px 48px 40px;
            border-top: 1px solid #eee;
        }

        .sjb5-footer-grid {
            max-width: var(--sjb5-max-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 64px;
        }

        .sjb5-footer-brand h2 {
            font-size: 24px;
            color: var(--sjb5-primary);
            margin-bottom: 16px;
        }

        .sjb5-footer-links h4 {
            margin-bottom: 24px;
            font-size: 16px;
        }

        .sjb5-footer-links ul {
            list-style: none;
        }

        .sjb5-footer-links ul li {
            margin-bottom: 12px;
        }

        .sjb5-footer-links ul li a {
            text-decoration: none;
            color: var(--sjb5-text-sub);
            font-size: 14px;
            transition: color 0.3s;
        }

        .sjb5-footer-links ul li a:hover {
            color: var(--sjb5-primary);
        }

        .sjb5-copyright {
            text-align: center;
            padding-top: 40px;
            border-top: 1px solid #eee;
            color: #999;
            font-size: 13px;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .sjb5-nav-container { padding: 0 24px; }
            .sjb5-menu { display: none; } /* 移动端建议折叠菜单，此处简化 */
            .sjb5-hero { padding-top: 120px; }
            .sjb5-ai-center, .sjb5-visual-layer { margin: 0 0 64px; border-radius: 0; padding: 64px 24px; }
            .sjb5-footer-grid { grid-template-columns: 1fr; }
        }

        /* 按钮样式 */
        .sjb5-btn-primary {
            display: inline-block;
            background: linear-gradient(90deg, var(--sjb5-primary) 0%, #ff7875 100%);
            color: white;
            padding: 16px 40px;
            border-radius: 30px;
            text-decoration: none;
            font-weight: 600;
            box-shadow: 0 10px 20px rgba(255, 77, 79, 0.2);
            transition: transform 0.3s, box-shadow 0.3s;
        }

        .sjb5-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 15px 30px rgba(255, 77, 79, 0.3);
        }