:root {
            --kuarrz-primary: #FF6600;
            --kuarrz-primary-light: #FF8533;
            --kuarrz-dark: #1D1D1F;
            --kuarrz-gray-bg: #F5F5F7;
            --kuarrz-text-main: #333333;
            --kuarrz-text-muted: #86868B;
            --kuarrz-white: #FFFFFF;
            --kuarrz-shadow: 0 10px 30px rgba(0,0,0,0.08);
            --kuarrz-radius: 16px;
            --kuarrz-container-width: 1100px;
        }

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

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

        /* 布局基础 */
        .kuarrz-container {
            max-width: var(--kuarrz-container-width);
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* 导航栏 */
        .kuarrz-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            z-index: 1000;
            border-bottom: 1px solid rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }

        .kuarrz-nav {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            min-width: 0;
        }

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

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

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

        .kuarrz-menu-item a {
            text-decoration: none;
            color: var(--kuarrz-text-main);
            font-size: 15px;
            font-weight: 500;
            transition: color 0.3s ease;
            white-space: nowrap;
        }

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

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

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

        /* Hero 区块 - 独特非对称布局 */
        .kuarrz-hero-section {
            padding-top: 160px;
            padding-bottom: 80px;
            background: linear-gradient(135deg, #ffffff 0%, #f9f9fb 100%);
            overflow: hidden;
            position: relative;
        }

        .kuarrz-hero-grid {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 48px;
            min-width: 0;
        }

        .kuarrz-hero-content {
            flex: 1;
            min-width: 320px;
            word-break: break-word;
        }

        .kuarrz-hero-tag {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(255, 102, 0, 0.1);
            color: var(--kuarrz-primary);
            border-radius: 100px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 24px;
        }

        .kuarrz-hero-title {
            font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
            font-weight: 800;
            line-height: 1.2;
            color: var(--kuarrz-dark);
            margin-bottom: 24px;
            word-break: keep-all;
        }

        .kuarrz-hero-subtitle {
            font-size: clamp(1rem, 1.5vw + 0.5rem, 1.25rem);
            color: var(--kuarrz-text-muted);
            max-width: 600px;
            margin-bottom: 40px;
        }

        /* 核心内容区 - 时光轴设计 */
        .kuarrz-timeline-section {
            padding: 80px 0;
            background: var(--kuarrz-gray-bg);
            position: relative;
        }

        .kuarrz-timeline-container {
            position: relative;
            padding-left: 40px;
        }

        .kuarrz-timeline-line {
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 2px;
            background: rgba(0,0,0,0.05);
        }

        .kuarrz-version-block {
            position: relative;
            margin-bottom: 64px;
            min-width: 0;
        }

        .kuarrz-version-node {
            position: absolute;
            left: -45px;
            top: 0;
            width: 12px;
            height: 12px;
            background: var(--kuarrz-primary);
            border-radius: 50%;
            border: 3px solid var(--kuarrz-white);
            box-shadow: 0 0 0 4px rgba(255, 102, 0, 0.1);
            z-index: 2;
        }

        .kuarrz-version-card {
            background: var(--kuarrz-white);
            border-radius: var(--kuarrz-radius);
            padding: 40px;
            box-shadow: var(--kuarrz-shadow);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            word-break: break-word;
        }

        .kuarrz-version-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.12);
        }

        .kuarrz-version-header {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 32px;
            gap: 16px;
            min-width: 0;
        }

        .kuarrz-version-number {
            font-size: 28px;
            font-weight: 700;
            color: var(--kuarrz-dark);
        }

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

        .kuarrz-version-body {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 32px;
            min-width: 0;
        }

        .kuarrz-feature-group h4 {
            font-size: 18px;
            margin-bottom: 16px;
            color: var(--kuarrz-dark);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .kuarrz-feature-list {
            list-style: none;
        }

        .kuarrz-feature-item {
            position: relative;
            padding-left: 20px;
            margin-bottom: 12px;
            font-size: 15px;
            color: #444;
        }

        .kuarrz-feature-item::before {
            content: '';
            position: absolute;
            left: 0;
            top: 10px;
            width: 6px;
            height: 6px;
            background: var(--kuarrz-primary);
            border-radius: 50%;
            opacity: 0.6;
        }

        /* 底部 CTA 区块 */
        .kuarrz-cta-section {
            background: var(--kuarrz-dark);
            padding: 96px 0;
            text-align: center;
            color: var(--kuarrz-white);
        }

        .kuarrz-cta-title {
            font-size: clamp(1.5rem, 3vw, 2.5rem);
            margin-bottom: 24px;
        }

        .kuarrz-btn-primary {
            display: inline-block;
            padding: 16px 48px;
            background: var(--kuarrz-primary);
            color: var(--kuarrz-white);
            text-decoration: none;
            border-radius: 100px;
            font-weight: 600;
            font-size: 18px;
            transition: all 0.3s ease;
            border: none;
            cursor: pointer;
        }

        .kuarrz-btn-primary:hover {
            background: var(--kuarrz-primary-light);
            transform: scale(1.05);
            box-shadow: 0 10px 20px rgba(255, 102, 0, 0.3);
        }

        /* 页脚 */
        .kuarrz-footer {
            background: #fdfdfd;
            padding: 64px 0 32px;
            border-top: 1px solid rgba(0,0,0,0.05);
        }

        .kuarrz-footer-grid {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
            margin-bottom: 48px;
            min-width: 0;
        }

        .kuarrz-footer-brand {
            flex: 1;
            min-width: 240px;
        }

        .kuarrz-footer-brand-name {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--kuarrz-dark);
        }

        .kuarrz-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 64px;
            min-width: 0;
        }

        .kuarrz-footer-column h5 {
            font-size: 16px;
            margin-bottom: 20px;
            color: var(--kuarrz-dark);
        }

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

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

        .kuarrz-footer-column ul li a {
            text-decoration: none;
            color: var(--kuarrz-text-muted);
            font-size: 14px;
            transition: color 0.3s ease;
        }

        .kuarrz-footer-column ul li a:hover {
            color: var(--kuarrz-primary);
        }

        .kuarrz-copyright {
            text-align: center;
            padding-top: 32px;
            border-top: 1px solid rgba(0,0,0,0.05);
            color: var(--kuarrz-text-muted);
            font-size: 13px;
        }

        /* 响应式设计 */
        @media (max-width: 768px) {
            .kuarrz-nav {
                height: auto;
                padding: 16px 0;
                justify-content: center;
                gap: 16px;
            }
            .kuarrz-menu {
                justify-content: center;
                gap: 12px;
            }
            .kuarrz-hero-section {
                padding-top: 120px;
                text-align: center;
            }
            .kuarrz-hero-subtitle {
                margin-left: auto;
                margin-right: auto;
            }
            .kuarrz-version-card {
                padding: 24px;
            }
            .kuarrz-version-node {
                left: -38px;
            }
            .kuarrz-timeline-container {
                padding-left: 30px;
            }
        }

        /* 动画增强 */
        .kuarrz-fade-in {
            animation: fadeIn 0.8s ease forwards;
        }

        @keyframes fadeIn {
            from { opacity: 0.5; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }