:root {
            --umkciz-primary: #ff4d4f;
            --umkciz-secondary: #1890ff;
            --umkciz-medical-blue: #0052cc;
            --umkciz-bg-light: #f4f7fa;
            --umkciz-text-main: #2c3e50;
            --umkciz-text-muted: #64748b;
            --umkciz-white: #ffffff;
            --umkciz-radius: 16px;
            --umkciz-spacing: 8px;
            --umkciz-container-width: 1300px;
        }

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

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

        /* 布局规范 */
        .umkciz-container {
            max-width: var(--umkciz-container-width);
            margin: 0 auto;
            padding: 0 calc(var(--umkciz-spacing) * 3);
        }

        .umkciz-flex {
            display: flex;
            flex-wrap: wrap;
        }

        .umkciz-flex-item {
            min-width: 0;
        }

        /* 导航栏 */
        .umkciz-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            z-index: 1000;
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
            padding: calc(var(--umkciz-spacing) * 2) 0;
        }

        .umkciz-nav-wrapper {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

        .umkciz-logo img {
            height: 40px;
            width: auto;
            display: block;
        }

        .umkciz-nav-menu {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
            gap: calc(var(--umkciz-spacing) * 3);
        }

        .umkciz-nav-item a {
            text-decoration: none;
            color: var(--umkciz-text-main);
            font-weight: 500;
            font-size: 1rem;
            transition: color 0.3s;
            padding: var(--umkciz-spacing) 0;
            position: relative;
        }

        .umkciz-nav-item a:hover,
        .umkciz-nav-item.umkciz-active a {
            color: var(--umkciz-primary);
        }

        .umkciz-nav-item.umkciz-active a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: var(--umkciz-primary);
            border-radius: 2px;
        }

        /* Hero 区块 - 独特非对称布局 */
        .umkciz-hero-section {
            padding: 160px 0 80px;
            background: linear-gradient(135deg, #ffffff 0%, #e6f7ff 100%);
            position: relative;
            overflow: hidden;
        }

        .umkciz-hero-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 48px;
            align-items: center;
        }

        .umkciz-hero-text {
            word-break: break-word;
        }

        .umkciz-hero-title {
            font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
            line-height: 1.2;
            color: var(--umkciz-medical-blue);
            margin-bottom: calc(var(--umkciz-spacing) * 3);
            font-weight: 800;
            white-space: normal;
        }

        .umkciz-hero-subtitle {
            font-size: clamp(1rem, 1.5vw + 0.5rem, 1.25rem);
            color: var(--umkciz-text-muted);
            margin-bottom: calc(var(--umkciz-spacing) * 5);
            max-width: 600px;
        }

        /* 词库下载卡片 */
        .umkciz-download-box {
            background: var(--umkciz-white);
            padding: 40px;
            border-radius: 24px;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.08);
            border: 1px solid rgba(0, 0, 0, 0.03);
            transition: transform 0.3s ease;
        }

        .umkciz-download-box:hover {
            transform: translateY(-5px);
        }

        .umkciz-search-bar {
            width: 100%;
            padding: 16px 24px;
            border: 2px solid #e2e8f0;
            border-radius: 12px;
            font-size: 1rem;
            margin-bottom: 24px;
            outline: none;
            transition: border-color 0.3s;
        }

        .umkciz-search-bar:focus {
            border-color: var(--umkciz-secondary);
        }

        .umkciz-btn-primary {
            display: inline-block;
            background: linear-gradient(90deg, var(--umkciz-primary), #ff7875);
            color: white;
            padding: 16px 40px;
            border-radius: 12px;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.1rem;
            text-align: center;
            transition: all 0.3s;
            border: none;
            cursor: pointer;
            width: 100%;
        }

        .umkciz-btn-primary:hover {
            box-shadow: 0 10px 20px rgba(255, 77, 79, 0.3);
            transform: scale(1.02);
        }

        /* 核心优势区块 */
        .umkciz-features {
            padding: 96px 0;
            background: var(--umkciz-white);
        }

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

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

        .umkciz-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 32px;
        }

        .umkciz-feature-card {
            padding: 32px;
            border-radius: var(--umkciz-radius);
            background: #f8fafc;
            border: 1px solid #edf2f7;
            transition: all 0.3s;
        }

        .umkciz-feature-card:hover {
            background: #ffffff;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.05);
        }

        .umkciz-feature-icon {
            font-size: 2.5rem;
            margin-bottom: 24px;
            display: block;
        }

        .umkciz-feature-h3 {
            font-size: 1.5rem;
            margin-bottom: 16px;
            color: var(--umkciz-medical-blue);
        }

        /* 词库分类区块 */
        .umkciz-lexicon-categories {
            padding: 96px 0;
            background-color: #f1f5f9;
        }

        .umkciz-category-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
            gap: 24px;
        }

        .umkciz-category-item {
            background: var(--umkciz-white);
            padding: 24px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            transition: 0.3s;
            cursor: pointer;
        }

        .umkciz-category-item:hover {
            background: var(--umkciz-medical-blue);
            color: white;
        }

        .umkciz-category-info h4 {
            font-size: 1.1rem;
            margin-bottom: 4px;
        }

        .umkciz-category-count {
            font-size: 0.85rem;
            opacity: 0.8;
        }

        /* 动态资讯区块 */
        .umkciz-news-section {
            padding: 96px 0;
        }

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

        .umkciz-news-card {
            background: white;
            border-radius: 16px;
            overflow: hidden;
            border: 1px solid #e2e8f0;
        }

        .umkciz-news-content {
            padding: 24px;
        }

        .umkciz-news-tag {
            display: inline-block;
            padding: 4px 12px;
            background: #e6f7ff;
            color: #1890ff;
            border-radius: 4px;
            font-size: 0.8rem;
            margin-bottom: 16px;
        }

        .umkciz-news-title {
            font-size: 1.25rem;
            margin-bottom: 12px;
            line-height: 1.4;
        }

        /* 页脚 */
        .umkciz-footer {
            background: #1a202c;
            color: #a0aec0;
            padding: 80px 0 40px;
        }

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

        .umkciz-footer-brand h2 {
            color: white;
            font-size: 1.5rem;
            margin-bottom: 24px;
        }

        .umkciz-footer-links h3 {
            color: white;
            margin-bottom: 24px;
            font-size: 1.1rem;
        }

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

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

        .umkciz-footer-links a {
            color: #a0aec0;
            text-decoration: none;
            transition: color 0.3s;
        }

        .umkciz-footer-links a:hover {
            color: white;
        }

        .umkciz-copyright {
            text-align: center;
            padding-top: 40px;
            border-top: 1px solid #2d3748;
            font-size: 0.9rem;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .umkciz-nav-menu {
                display: none; /* 简化演示，实际开发中会增加汉堡菜单 */
            }
            .umkciz-hero-section {
                padding: 120px 0 60px;
                text-align: center;
            }
            .umkciz-hero-subtitle {
                margin-left: auto;
                margin-right: auto;
            }
        }

        /* 结构化数据样式隐藏 */
        .umkciz-hidden {
            display: none;
        }