:root {
            --umkciz-primary: #FF4D29;
            --umkciz-primary-hover: #E63E1B;
            --umkciz-bg: #F8F9FB;
            --umkciz-text-dark: #1D1D1F;
            --umkciz-text-light: #86868B;
            --umkciz-white: #FFFFFF;
            --umkciz-card-shadow: 0 10px 30px rgba(0,0,0,0.05);
            --umkciz-radius: 16px;
            --umkciz-max-width: 1140px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--umkciz-bg);
            color: var(--umkciz-text-dark);
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* 导航栏 */
        .umkciz-navbar {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 72px;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(15px);
            -webkit-backdrop-filter: blur(15px);
            z-index: 1000;
            border-bottom: 1px solid rgba(0,0,0,0.05);
            display: flex;
            align-items: center;
        }

        .umkciz-nav-container {
            max-width: var(--umkciz-max-width);
            margin: 0 auto;
            width: 100%;
            padding: 0 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

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

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

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

        .umkciz-nav-menu a {
            text-decoration: none;
            color: var(--umkciz-text-dark);
            font-size: 15px;
            font-weight: 500;
            transition: color 0.3s;
            word-break: keep-all;
        }

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

        .umkciz-nav-menu a.active {
            color: var(--umkciz-primary);
            font-weight: 700;
        }

        /* Hero 区块 */
        .umkciz-hero {
            padding-top: 140px;
            padding-bottom: 80px;
            text-align: center;
            background: radial-gradient(circle at 50% 0%, #FFF5F2 0%, #F8F9FB 100%);
        }

        .umkciz-hero-content {
            max-width: 900px;
            margin: 0 auto;
            padding: 0 24px;
            word-break: break-word;
        }

        .umkciz-hero-title {
            font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 24px;
            color: var(--umkciz-text-dark);
            white-space: normal;
        }

        .umkciz-hero-subtitle {
            font-size: clamp(1.1rem, 1.5vw + 0.5rem, 1.4rem);
            color: var(--umkciz-text-light);
            margin-bottom: 48px;
            line-height: 1.6;
        }

        .umkciz-download-box {
            display: inline-flex;
            flex-direction: column;
            align-items: center;
            background: var(--umkciz-white);
            padding: 32px;
            border-radius: 24px;
            box-shadow: 0 20px 40px rgba(255, 77, 41, 0.1);
            min-width: 0;
        }

        .umkciz-btn-primary {
            background: linear-gradient(135deg, #FF6B4A 0%, #FF4D29 100%);
            color: white;
            padding: 18px 56px;
            border-radius: 40px;
            font-size: 1.25rem;
            font-weight: 600;
            text-decoration: none;
            display: inline-block;
            transition: transform 0.3s, box-shadow 0.3s;
            box-shadow: 0 8px 20px rgba(255, 77, 41, 0.3);
            margin-bottom: 16px;
        }

        .umkciz-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 25px rgba(255, 77, 41, 0.4);
        }

        .umkciz-version-info {
            font-size: 14px;
            color: var(--umkciz-text-light);
        }

        /* 通用 Section */
        .umkciz-section {
            padding: 96px 24px;
            max-width: var(--umkciz-max-width);
            margin: 0 auto;
        }

        .umkciz-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            align-items: center;
        }

        .umkciz-grid > * {
            flex: 1;
            min-width: 300px;
        }

        .umkciz-image-wrapper {
            position: relative;
            border-radius: var(--umkciz-radius);
            overflow: hidden;
            box-shadow: var(--umkciz-card-shadow);
        }

        .umkciz-image-wrapper img {
            width: 100%;
            height: auto;
            display: block;
            transition: transform 0.5s;
        }

        .umkciz-image-wrapper:hover img {
            transform: scale(1.03);
        }

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

        .umkciz-section-tag {
            color: var(--umkciz-primary);
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 2px;
            margin-bottom: 16px;
            display: block;
        }

        .umkciz-section-title {
            font-size: clamp(1.8rem, 3vw, 2.5rem);
            margin-bottom: 24px;
            line-height: 1.3;
        }

        .umkciz-section-desc {
            font-size: 1.1rem;
            color: var(--umkciz-text-light);
            margin-bottom: 32px;
        }

        /* 极速下载区块 */
        .umkciz-speed-section {
            background-color: #111;
            color: white;
            padding: 96px 0;
            margin-top: 48px;
        }

        .umkciz-speed-container {
            max-width: var(--umkciz-max-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            align-items: center;
        }

        .umkciz-speed-content {
            flex: 1;
            min-width: 300px;
        }

        .umkciz-speed-image {
            flex: 1.2;
            min-width: 300px;
            border-radius: 20px;
            overflow: hidden;
        }

        .umkciz-speed-image img {
            width: 100%;
            height: auto;
            filter: brightness(0.9);
        }

        /* 动态内容区块 */
        .umkciz-news-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
            margin-top: 48px;
        }

        .umkciz-news-card {
            background: var(--umkciz-white);
            padding: 32px;
            border-radius: var(--umkciz-radius);
            box-shadow: var(--umkciz-card-shadow);
            transition: transform 0.3s;
            border: 1px solid rgba(0,0,0,0.02);
        }

        .umkciz-news-card:hover {
            transform: translateY(-8px);
        }

        .umkciz-news-date {
            font-size: 14px;
            color: var(--umkciz-primary);
            margin-bottom: 12px;
            display: block;
        }

        .umkciz-news-h3 {
            font-size: 1.4rem;
            margin-bottom: 16px;
            word-break: keep-all;
        }

        /* 页脚 */
        .umkciz-footer {
            background: #FFFFFF;
            padding: 80px 24px 40px;
            border-top: 1px solid #EEEEEE;
        }

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

        .umkciz-footer-brand {
            flex: 1.5;
            min-width: 250px;
        }

        .umkciz-footer-title {
            font-size: 24px;
            font-weight: 800;
            color: var(--umkciz-primary);
            margin-bottom: 24px;
        }

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

        .umkciz-footer-links h4 {
            margin-bottom: 20px;
            font-size: 16px;
        }

        .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-light);
            transition: color 0.3s;
            font-size: 14px;
        }

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

        .umkciz-copyright {
            width: 100%;
            text-align: center;
            padding-top: 60px;
            border-top: 1px solid #F0F0F0;
            margin-top: 60px;
            color: #AAA;
            font-size: 13px;
        }

        /* 响应式适配 */
        @media (max-width: 768px) {
            .umkciz-navbar {
                height: auto;
                padding: 12px 0;
            }
            .umkciz-nav-menu {
                display: none; /* 简化移动端，实际项目中可加汉堡菜单 */
            }
            .umkciz-grid {
                flex-direction: column;
            }
            .umkciz-hero {
                padding-top: 100px;
            }
            .umkciz-speed-container {
                flex-direction: column-reverse;
            }
        }