:root {
            --umkciz-primary: #ff6600;
            --umkciz-primary-gradient: linear-gradient(135deg, #ff8c42 0%, #ff6600 100%);
            --umkciz-mac-bg: #f5f5f7;
            --umkciz-white: #ffffff;
            --umkciz-text-main: #1d1d1f;
            --umkciz-text-sub: #86868b;
            --umkciz-card-shadow: 0 8px 30px rgba(0,0,0,0.04);
            --umkciz-glass: rgba(255, 255, 255, 0.72);
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "SF Pro SC", "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
            background-color: var(--umkciz-mac-bg);
            color: var(--umkciz-text-main);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        /* 布局容器 */
        .umkciz-container {
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* 导航栏 */
        .umkciz-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: var(--umkciz-glass);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
        }

        .umkciz-nav-wrapper {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            height: 64px;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .umkciz-logo {
            flex-shrink: 0;
            min-width: 0;
        }

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

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

        .umkciz-nav-item a {
            text-decoration: none;
            color: var(--umkciz-text-main);
            font-size: 14px;
            font-weight: 500;
            transition: color 0.3s ease;
            white-space: nowrap;
        }

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

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

        .umkciz-nav-item.active a::after {
            content: '';
            position: absolute;
            bottom: -21px;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--umkciz-primary);
        }

        /* Hero 区块 - 独特非对称布局 */
        .umkciz-hero {
            padding-top: 160px;
            padding-bottom: 96px;
            background: radial-gradient(circle at top right, rgba(255, 102, 0, 0.05), transparent 40%);
            text-align: center;
        }

        .umkciz-hero-content {
            max-width: 800px;
            margin: 0 auto;
            word-break: break-word;
        }

        .umkciz-hero-tag {
            display: inline-block;
            background: rgba(255, 102, 0, 0.1);
            color: var(--umkciz-primary);
            padding: 4px 16px;
            border-radius: 20px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 24px;
        }

        .umkciz-hero h1 {
            font-size: clamp(2.5rem, 5vw + 1rem, 4rem);
            line-height: 1.1;
            font-weight: 700;
            margin-bottom: 24px;
            letter-spacing: -0.02em;
            word-break: keep-all;
        }

        .umkciz-hero p {
            font-size: clamp(1.1rem, 1vw + 0.8rem, 1.4rem);
            color: var(--umkciz-text-sub);
            margin-bottom: 48px;
            line-height: 1.5;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        .umkciz-download-group {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
            min-width: 0;
        }

        .umkciz-btn-primary {
            background: var(--umkciz-primary-gradient);
            color: white;
            padding: 16px 48px;
            border-radius: 12px;
            text-decoration: none;
            font-size: 18px;
            font-weight: 600;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            box-shadow: 0 10px 20px rgba(255, 102, 0, 0.2);
        }

        .umkciz-btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 15px 30px rgba(255, 102, 0, 0.3);
        }

        .umkciz-version-info {
            margin-top: 24px;
            font-size: 13px;
            color: var(--umkciz-text-sub);
        }

        /* 核心特性 - Bento Grid 布局 */
        .umkciz-features {
            padding: 64px 0;
        }

        .umkciz-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 24px;
        }

        .umkciz-feature-card {
            background: var(--umkciz-white);
            border-radius: 24px;
            padding: 40px;
            transition: transform 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
            display: flex;
            flex-direction: column;
            border: 1px solid rgba(0,0,0,0.03);
            min-width: 0;
            word-break: break-word;
        }

        .umkciz-feature-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--umkciz-card-shadow);
        }

        .umkciz-card-icon {
            width: 56px;
            height: 56px;
            background: #f5f5f7;
            border-radius: 14px;
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .umkciz-card-icon svg {
            width: 32px;
            height: 32px;
            color: var(--umkciz-primary);
        }

        .umkciz-feature-card h3 {
            font-size: 24px;
            margin-bottom: 16px;
            font-weight: 600;
        }

        .umkciz-feature-card p {
            color: var(--umkciz-text-sub);
            font-size: 16px;
            line-height: 1.6;
        }

        /* AI 智投动态区 */
        .umkciz-dynamic-section {
            padding: 96px 0;
            background: #ffffff;
            margin: 64px 0;
            border-radius: 48px;
        }

        .umkciz-section-header {
            text-align: center;
            margin-bottom: 64px;
            padding: 0 24px;
        }

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

        .umkciz-article-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            min-width: 0;
        }

        .umkciz-article-item {
            flex: 1;
            min-width: 300px;
            padding: 32px;
            border-left: 1px solid #eee;
        }

        .umkciz-article-item h4 {
            font-size: 20px;
            margin-bottom: 12px;
        }

        .umkciz-article-item p {
            color: var(--umkciz-text-sub);
            font-size: 15px;
        }

        /* 规格参数区 */
        .umkciz-specs {
            padding: 64px 0;
            background: #000;
            color: #fff;
            border-radius: 40px;
            margin: 64px 24px;
        }

        .umkciz-specs-content {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-around;
            text-align: center;
            gap: 48px;
        }

        .umkciz-spec-item {
            flex: 1;
            min-width: 200px;
        }

        .umkciz-spec-value {
            font-size: 40px;
            font-weight: 700;
            color: var(--umkciz-primary);
            display: block;
            margin-bottom: 8px;
        }

        .umkciz-spec-label {
            color: #86868b;
            font-size: 14px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        /* 底部 */
        .umkciz-footer {
            background: var(--umkciz-mac-bg);
            padding: 80px 0 40px;
            border-top: 1px solid rgba(0,0,0,0.05);
        }

        .umkciz-footer-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 64px;
            margin-bottom: 64px;
        }

        .umkciz-footer-brand {
            flex: 2;
            min-width: 260px;
        }

        .umkciz-brand-name {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--umkciz-text-main);
        }

        .umkciz-footer-links {
            flex: 1;
            min-width: 150px;
        }

        .umkciz-footer-links h5 {
            margin-bottom: 24px;
            font-size: 14px;
            color: var(--umkciz-text-main);
        }

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

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

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

        .umkciz-footer-links a:hover {
            color: var(--umkciz-primary);
        }

        .umkciz-copyright {
            padding-top: 32px;
            border-top: 1px solid rgba(0,0,0,0.05);
            text-align: center;
            font-size: 12px;
            color: var(--umkciz-text-sub);
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .umkciz-nav-menu {
                display: none; /* 简化移动端，实际开发中应有汉堡菜单 */
            }
            .umkciz-hero h1 {
                font-size: 32px;
            }
            .umkciz-grid {
                grid-template-columns: 1fr;
            }
            .umkciz-article-item {
                border-left: none;
                border-bottom: 1px solid #eee;
            }
        }