:root {
            --kuarrz-primary: #FF5B00;
            --kuarrz-primary-hover: #E65200;
            --kuarrz-dark: #1D1D1F;
            --kuarrz-text: #333333;
            --kuarrz-text-light: #86868b;
            --kuarrz-bg-light: #f5f5f7;
            --kuarrz-white: #ffffff;
            --kuarrz-transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            --kuarrz-max-width: 1400px;
        }

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

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

        /* 布局通用类 */
        .kuarrz-container {
            max-width: var(--kuarrz-max-width);
            margin: 0 auto;
            padding: 0 48px;
            width: 100%;
        }

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

        .kuarrz-grid {
            display: grid;
            gap: 32px;
        }

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

        .kuarrz-nav-wrapper {
            height: 72px;
            align-items: center;
            justify-content: space-between;
        }

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

        .kuarrz-nav-list {
            list-style: none;
            gap: 32px;
            align-items: center;
        }

        .kuarrz-nav-item a {
            text-decoration: none;
            color: var(--kuarrz-text);
            font-size: 15px;
            font-weight: 500;
            transition: var(--kuarrz-transition);
            position: relative;
        }

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

        .kuarrz-nav-item.active a {
            color: var(--kuarrz-primary);
        }

        .kuarrz-nav-item.active a::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--kuarrz-primary);
        }

        /* Hero 区块 - 独特非对称布局 */
        .kuarrz-hero {
            padding-top: 160px;
            padding-bottom: 96px;
            background: radial-gradient(circle at top right, rgba(255, 91, 0, 0.05), transparent 40%),
                        radial-gradient(circle at bottom left, rgba(255, 91, 0, 0.03), transparent 30%);
            position: relative;
            overflow: hidden;
        }

        .kuarrz-hero-content {
            max-width: 800px;
            margin-bottom: 64px;
        }

        .kuarrz-hero-title {
            font-size: clamp(2rem, 5vw, 4rem);
            font-weight: 700;
            line-height: 1.1;
            margin-bottom: 24px;
            color: var(--kuarrz-dark);
            word-break: break-word;
        }

        .kuarrz-hero-subtitle {
            font-size: clamp(1rem, 2vw + 0.5rem, 1.5rem);
            color: var(--kuarrz-text-light);
            max-width: 700px;
            margin-bottom: 40px;
            word-break: break-word;
        }

        /* PC 下载卡片 */
        .kuarrz-pc-section {
            background: var(--kuarrz-bg-light);
            border-radius: 40px;
            padding: 80px;
            margin-bottom: 64px;
            position: relative;
            overflow: hidden;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .kuarrz-pc-info {
            flex: 1;
            min-width: 0;
            z-index: 2;
        }

        .kuarrz-pc-image {
            flex: 1;
            min-width: 0;
            display: flex;
            justify-content: flex-end;
            z-index: 1;
        }

        .kuarrz-pc-image img {
            max-width: 100%;
            height: auto;
            border-radius: 20px;
            box-shadow: 0 32px 64px rgba(0,0,0,0.1);
            transition: var(--kuarrz-transition);
        }

        .kuarrz-pc-image img:hover {
            transform: scale(1.02);
        }

        .kuarrz-badge {
            display: inline-block;
            background: var(--kuarrz-primary);
            color: white;
            padding: 6px 16px;
            border-radius: 100px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 24px;
        }

        .kuarrz-btn-primary {
            display: inline-flex;
            align-items: center;
            background: var(--kuarrz-primary);
            color: white;
            padding: 20px 48px;
            border-radius: 16px;
            text-decoration: none;
            font-size: 18px;
            font-weight: 600;
            transition: var(--kuarrz-transition);
            box-shadow: 0 10px 30px rgba(255, 91, 0, 0.3);
        }

        .kuarrz-btn-primary:hover {
            background: var(--kuarrz-primary-hover);
            transform: translateY(-3px);
            box-shadow: 0 15px 40px rgba(255, 91, 0, 0.4);
        }

        /* 移动端与Mac双列布局 */
        .kuarrz-platform-grid {
            grid-template-columns: repeat(2, 1fr);
            margin-bottom: 96px;
        }

        .kuarrz-platform-card {
            background: var(--kuarrz-white);
            border: 1px solid rgba(0,0,0,0.05);
            border-radius: 32px;
            padding: 48px;
            transition: var(--kuarrz-transition);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .kuarrz-platform-card:hover {
            border-color: var(--kuarrz-primary);
            box-shadow: 0 20px 40px rgba(0,0,0,0.05);
        }

        .kuarrz-platform-visual {
            margin-bottom: 32px;
            height: 300px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: #fcfcfc;
            border-radius: 24px;
            overflow: hidden;
        }

        .kuarrz-platform-visual img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--kuarrz-transition);
        }

        .kuarrz-platform-card:hover .kuarrz-platform-visual img {
            transform: scale(1.05);
        }

        .kuarrz-platform-title {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .kuarrz-platform-desc {
            color: var(--kuarrz-text-light);
            margin-bottom: 32px;
            font-size: 16px;
        }

        /* 版本特性列表 */
        .kuarrz-features {
            padding: 96px 0;
            background-color: var(--kuarrz-dark);
            color: var(--kuarrz-white);
            border-radius: 48px;
            margin-bottom: 96px;
        }

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

        .kuarrz-feature-grid {
            grid-template-columns: repeat(3, 1fr);
        }

        .kuarrz-feature-item {
            padding: 40px;
            border-left: 1px solid rgba(255,255,255,0.1);
        }

        .kuarrz-feature-icon {
            font-size: 32px;
            margin-bottom: 24px;
            color: var(--kuarrz-primary);
        }

        .kuarrz-feature-name {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .kuarrz-feature-text {
            color: rgba(255,255,255,0.6);
            font-size: 15px;
            line-height: 1.8;
        }

        /* 动态内容区块 */
        .kuarrz-dynamic-section {
            padding: 64px 0;
            margin-bottom: 96px;
        }

        .kuarrz-article-card {
            padding: 24px;
            border-bottom: 1px solid #eee;
            transition: var(--kuarrz-transition);
        }

        .kuarrz-article-card:hover {
            background: var(--kuarrz-bg-light);
        }

        /* 页脚 */
        .kuarrz-footer {
            background: var(--kuarrz-bg-light);
            padding: 80px 0 40px;
            border-radius: 48px 48px 0 0;
        }

        .kuarrz-footer-grid {
            grid-template-columns: 2fr 1fr 1fr 1fr;
            margin-bottom: 64px;
        }

        .kuarrz-footer-brand-name {
            font-size: 24px;
            font-weight: 700;
            color: var(--kuarrz-primary);
            margin-bottom: 24px;
        }

        .kuarrz-footer-links-title {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 24px;
            color: var(--kuarrz-dark);
        }

        .kuarrz-footer-link-item {
            list-style: none;
            margin-bottom: 12px;
        }

        .kuarrz-footer-link-item a {
            text-decoration: none;
            color: var(--kuarrz-text-light);
            font-size: 14px;
            transition: var(--kuarrz-transition);
        }

        .kuarrz-footer-link-item a:hover {
            color: var(--kuarrz-primary);
        }

        .kuarrz-copyright {
            text-align: center;
            padding-top: 40px;
            border-top: 1px solid rgba(0,0,0,0.05);
            color: var(--kuarrz-text-light);
            font-size: 14px;
        }

        /* 响应式适配 */
        @media (max-width: 1024px) {
            .kuarrz-pc-section {
                flex-direction: column;
                padding: 48px;
                text-align: center;
            }
            .kuarrz-pc-image {
                margin-top: 48px;
                justify-content: center;
            }
            .kuarrz-feature-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .kuarrz-container {
                padding: 0 24px;
            }
            .kuarrz-nav-list {
                display: none; /* 简化演示，移动端隐藏 */
            }
            .kuarrz-hero-title {
                font-size: 2.5rem;
            }
            .kuarrz-platform-grid {
                grid-template-columns: 1fr;
            }
            .kuarrz-feature-grid {
                grid-template-columns: 1fr;
            }
            .kuarrz-footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 40px;
            }
            .kuarrz-pc-section {
                padding: 32px;
            }
        }