:root {
            --kuarrz-primary: #ff6600;
            --kuarrz-primary-dark: #e65c00;
            --kuarrz-blue: #1a56ff;
            --kuarrz-text-main: #1d1d1f;
            --kuarrz-text-sub: #6e6e73;
            --kuarrz-bg-light: #f5f5f7;
            --kuarrz-white: #ffffff;
            --kuarrz-max-width: 1400px;
            --kuarrz-transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            -webkit-font-smoothing: antialiased;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--kuarrz-text-main);
            line-height: 1.6;
            background-color: var(--kuarrz-white);
            overflow-x: hidden;
        }

        /* 导航栏 */
        .kuarrz-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
        }

        .kuarrz-nav-container {
            max-width: var(--kuarrz-max-width);
            margin: 0 auto;
            padding: 0 48px;
            height: 64px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

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

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

        .kuarrz-menu {
            display: flex;
            list-style: none;
            gap: 32px;
            flex-wrap: wrap;
            min-width: 0;
        }

        .kuarrz-menu-item a {
            text-decoration: none;
            color: var(--kuarrz-text-main);
            font-size: 14px;
            font-weight: 500;
            transition: var(--kuarrz-transition);
            word-break: keep-all;
        }

        .kuarrz-menu-item a:hover {
            color: var(--kuarrz-blue);
        }

        .kuarrz-menu-item a.kuarrz-active {
            color: var(--kuarrz-blue);
            position: relative;
        }

        .kuarrz-menu-item a.kuarrz-active::after {
            content: '';
            position: absolute;
            bottom: -22px;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--kuarrz-blue);
        }

        /* Hero 区块 - 独特非对称布局 */
        .kuarrz-hero-section {
            padding: 160px 48px 96px;
            background: radial-gradient(circle at 80% 20%, rgba(26, 86, 255, 0.05) 0%, rgba(255, 102, 0, 0.02) 100%);
            display: flex;
            justify-content: center;
            align-items: center;
            overflow: hidden;
        }

        .kuarrz-hero-inner {
            max-width: var(--kuarrz-max-width);
            width: 100%;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
        }

        .kuarrz-hero-text {
            flex: 1;
            min-width: 300px;
            word-break: break-word;
        }

        .kuarrz-hero-tag {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(26, 86, 255, 0.1);
            color: var(--kuarrz-blue);
            border-radius: 100px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 24px;
        }

        .kuarrz-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
            line-height: 1.1;
            font-weight: 800;
            margin-bottom: 32px;
            color: var(--kuarrz-text-main);
            letter-spacing: -0.02em;
        }

        .kuarrz-hero-subtitle {
            font-size: clamp(1.1rem, 1.5vw + 0.5rem, 1.5rem);
            color: var(--kuarrz-text-sub);
            max-width: 600px;
            margin-bottom: 48px;
            line-height: 1.5;
        }

        .kuarrz-hero-visual {
            flex: 1;
            min-width: 300px;
            position: relative;
            display: flex;
            justify-content: center;
        }

        /* 纯CSS装饰性智慧引擎元素 */
        .kuarrz-smart-engine-blob {
            width: 400px;
            height: 400px;
            background: linear-gradient(135deg, var(--kuarrz-blue), #7000ff);
            border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%;
            filter: blur(60px);
            opacity: 0.2;
            animation: kuarrz-morph 10s ease-in-out infinite;
        }

        @keyframes kuarrz-morph {
            0% { border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%; }
            50% { border-radius: 60% 40% 30% 70% / 50% 60% 40% 60%; }
            100% { border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%; }
        }

        /* 下载控制台 */
        .kuarrz-download-console {
            background: var(--kuarrz-white);
            border-radius: 32px;
            padding: 48px;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.1);
            margin-top: -64px;
            position: relative;
            z-index: 10;
            border: 1px solid rgba(0,0,0,0.03);
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
        }

        .kuarrz-download-main {
            flex: 2;
            min-width: 300px;
        }

        .kuarrz-download-sidebar {
            flex: 1;
            min-width: 240px;
            padding-left: 32px;
            border-left: 1px solid #eee;
        }

        .kuarrz-btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 20px 48px;
            background: var(--kuarrz-primary);
            color: white;
            text-decoration: none;
            border-radius: 16px;
            font-size: 20px;
            font-weight: 700;
            transition: var(--kuarrz-transition);
            box-shadow: 0 10px 20px rgba(255, 102, 0, 0.3);
            margin-bottom: 16px;
        }

        .kuarrz-btn-primary:hover {
            transform: translateY(-3px);
            background: var(--kuarrz-primary-dark);
            box-shadow: 0 15px 30px rgba(255, 102, 0, 0.4);
        }

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

        /* 特性展示区 */
        .kuarrz-section {
            padding: 96px 48px;
            max-width: var(--kuarrz-max-width);
            margin: 0 auto;
        }

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

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

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

        .kuarrz-feature-card {
            background: var(--kuarrz-bg-light);
            padding: 48px;
            border-radius: 24px;
            transition: var(--kuarrz-transition);
            display: flex;
            flex-direction: column;
            gap: 24px;
            border: 1px solid transparent;
        }

        .kuarrz-feature-card:hover {
            background: var(--kuarrz-white);
            border-color: var(--kuarrz-blue);
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.05);
        }

        .kuarrz-feature-icon {
            width: 56px;
            height: 56px;
            background: var(--kuarrz-white);
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: var(--kuarrz-blue);
            box-shadow: 0 10px 20px rgba(0,0,0,0.02);
        }

        .kuarrz-feature-card h3 {
            font-size: 24px;
            font-weight: 700;
        }

        .kuarrz-feature-card p {
            color: var(--kuarrz-text-sub);
            font-size: 16px;
            line-height: 1.7;
        }

        /* 动态内容区块 */
        .kuarrz-dynamic-section {
            background-color: var(--kuarrz-bg-light);
            padding: 96px 48px;
        }

        .kuarrz-news-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            max-width: var(--kuarrz-max-width);
            margin: 0 auto;
        }

        .kuarrz-news-item {
            flex: 1;
            min-width: 300px;
            background: var(--kuarrz-white);
            padding: 32px;
            border-radius: 20px;
            transition: var(--kuarrz-transition);
        }

        .kuarrz-news-item:hover {
            transform: scale(1.02);
        }

        .kuarrz-news-date {
            font-size: 12px;
            color: var(--kuarrz-blue);
            font-weight: 700;
            text-transform: uppercase;
            margin-bottom: 12px;
            display: block;
        }

        /* 页脚 */
        .kuarrz-footer {
            background: var(--kuarrz-text-main);
            color: var(--kuarrz-white);
            padding: 96px 48px 48px;
        }

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

        .kuarrz-footer-brand h4 {
            font-size: 24px;
            margin-bottom: 24px;
            color: var(--kuarrz-white);
        }

        .kuarrz-footer-links h5 {
            font-size: 16px;
            margin-bottom: 24px;
            opacity: 0.6;
        }

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

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

        .kuarrz-footer-links a {
            color: var(--kuarrz-white);
            text-decoration: none;
            opacity: 0.8;
            transition: var(--kuarrz-transition);
            font-size: 14px;
        }

        .kuarrz-footer-links a:hover {
            opacity: 1;
            color: var(--kuarrz-primary);
        }

        .kuarrz-footer-bottom {
            max-width: var(--kuarrz-max-width);
            margin: 0 auto;
            padding-top: 48px;
            border-top: 1px solid rgba(255,255,255,0.1);
            text-align: center;
            font-size: 14px;
            color: rgba(255,255,255,0.5);
        }

        /* 响应式调整 */
        @media (max-width: 1024px) {
            .kuarrz-nav-container { padding: 0 24px; }
            .kuarrz-hero-section { padding: 120px 24px 64px; }
            .kuarrz-download-console { margin-top: 0; border-radius: 0; margin-left: -24px; margin-right: -24px; }
        }

        @media (max-width: 768px) {
            .kuarrz-menu { display: none; } /* 移动端建议使用汉堡菜单，此处简化 */
            .kuarrz-hero-inner { gap: 32px; }
            .kuarrz-download-sidebar { border-left: none; border-top: 1px solid #eee; padding-left: 0; padding-top: 32px; }
            .kuarrz-section { padding: 64px 24px; }
        }