:root {
            --kuarrz-primary: #ff6600;
            --kuarrz-primary-light: #ff8533;
            --kuarrz-secondary: #2c3e50;
            --kuarrz-text-dark: #1d1d1f;
            --kuarrz-text-gray: #86868b;
            --kuarrz-bg-light: #f5f5f7;
            --kuarrz-white: #ffffff;
            --kuarrz-accent: #0071e3;
            --kuarrz-card-shadow: 0 10px 30px rgba(0,0,0,0.08);
            --kuarrz-transition: all 0.4s cubic-bezier(0.25, 1, 0.5, 1);
        }

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

        body {
            font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--kuarrz-bg-light);
            color: var(--kuarrz-text-dark);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: keep-all;
        }

        /* 导航栏设计 */
        .kuarrz-header {
            position: fixed;
            top: 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: 1400px;
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            padding: 0 24px;
            height: 64px;
        }

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

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

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

        .kuarrz-nav-item {
            margin-left: 32px;
            min-width: 0;
        }

        .kuarrz-nav-link {
            text-decoration: none;
            color: var(--kuarrz-text-dark);
            font-size: 14px;
            font-weight: 500;
            transition: var(--kuarrz-transition);
            position: relative;
        }

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

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

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

        /* Hero 区域 - 独特对角线分割设计 */
        .kuarrz-hero {
            padding-top: 160px;
            padding-bottom: 96px;
            background: linear-gradient(135deg, #fff 0%, #fff5f0 100%);
            position: relative;
            overflow: hidden;
        }

        .kuarrz-hero-content {
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            min-width: 0;
        }

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

        .kuarrz-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4rem);
            font-weight: 700;
            line-height: 1.1;
            margin-bottom: 24px;
            color: var(--kuarrz-secondary);
        }

        .kuarrz-hero-subtitle {
            font-size: clamp(1.1rem, 2vw + 0.5rem, 1.5rem);
            color: var(--kuarrz-text-gray);
            margin-bottom: 48px;
            max-width: 600px;
        }

        .kuarrz-hero-visual {
            flex: 1;
            min-width: 320px;
            display: flex;
            justify-content: center;
            position: relative;
        }

        /* 装饰性元素替代缺失图片 */
        .kuarrz-time-vault {
            width: 300px;
            height: 300px;
            background: var(--kuarrz-white);
            border-radius: 40px;
            box-shadow: var(--kuarrz-card-shadow);
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            transform: rotate(5deg);
            border: 8px solid var(--kuarrz-primary);
            position: relative;
        }

        .kuarrz-time-vault::before {
            content: "ARCHIVE";
            position: absolute;
            top: 20px;
            font-weight: 900;
            color: #eee;
            font-size: 40px;
            z-index: 0;
        }

        .kuarrz-vault-number {
            font-size: 80px;
            font-weight: 800;
            color: var(--kuarrz-primary);
            z-index: 1;
        }

        /* 历史版本筛选区 */
        .kuarrz-filter-section {
            padding: 64px 0;
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .kuarrz-filter-bar {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 48px;
            justify-content: center;
        }

        .kuarrz-filter-btn {
            padding: 12px 24px;
            border-radius: 30px;
            border: 1px solid #ddd;
            background: var(--kuarrz-white);
            cursor: pointer;
            transition: var(--kuarrz-transition);
            font-weight: 500;
        }

        .kuarrz-filter-btn:hover, .kuarrz-filter-btn.active {
            background: var(--kuarrz-primary);
            color: var(--kuarrz-white);
            border-color: var(--kuarrz-primary);
            transform: translateY(-2px);
        }

        /* 版本卡片网格 */
        .kuarrz-version-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 32px;
            padding: 48px 0;
        }

        .kuarrz-version-card {
            background: var(--kuarrz-white);
            border-radius: 20px;
            padding: 32px;
            transition: var(--kuarrz-transition);
            box-shadow: 0 4px 12px rgba(0,0,0,0.03);
            border: 1px solid rgba(0,0,0,0.05);
            display: flex;
            flex-direction: column;
            min-width: 0;
        }

        .kuarrz-version-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--kuarrz-card-shadow);
        }

        .kuarrz-v-tag {
            display: inline-block;
            padding: 4px 12px;
            background: #fff0e6;
            color: var(--kuarrz-primary);
            font-size: 12px;
            border-radius: 6px;
            font-weight: 600;
            margin-bottom: 16px;
            align-self: flex-start;
        }

        .kuarrz-v-title {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .kuarrz-v-date {
            color: var(--kuarrz-text-gray);
            font-size: 14px;
            margin-bottom: 24px;
        }

        .kuarrz-v-features {
            list-style: none;
            margin-bottom: 32px;
            flex-grow: 1;
        }

        .kuarrz-v-features li {
            font-size: 14px;
            margin-bottom: 8px;
            color: var(--kuarrz-text-dark);
            display: flex;
            align-items: center;
        }

        .kuarrz-v-features li::before {
            content: "✓";
            color: var(--kuarrz-primary);
            margin-right: 8px;
            font-weight: bold;
        }

        .kuarrz-download-btn {
            display: block;
            text-align: center;
            background: var(--kuarrz-secondary);
            color: var(--kuarrz-white);
            padding: 14px;
            border-radius: 12px;
            text-decoration: none;
            font-weight: 600;
            transition: var(--kuarrz-transition);
        }

        .kuarrz-download-btn:hover {
            background: var(--kuarrz-primary);
            box-shadow: 0 5px 15px rgba(255,102,0,0.3);
        }

        /* 动态内容区块 - 资讯 */
        .kuarrz-news-section {
            background: var(--kuarrz-white);
            padding: 96px 24px;
        }

        .kuarrz-section-container {
            max-width: 1100px;
            margin: 0 auto;
        }

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

        .kuarrz-section-title {
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .kuarrz-news-list {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            min-width: 0;
        }

        .kuarrz-news-item {
            flex: 1;
            min-width: 300px;
            padding: 24px;
            border-bottom: 1px solid #eee;
            transition: var(--kuarrz-transition);
        }

        .kuarrz-news-item:hover {
            background: var(--kuarrz-bg-light);
            border-radius: 12px;
        }

        .kuarrz-news-date {
            font-size: 12px;
            color: var(--kuarrz-primary);
            font-weight: 600;
            margin-bottom: 8px;
        }

        .kuarrz-news-h3 {
            font-size: 18px;
            margin-bottom: 12px;
        }

        /* 页脚设计 */
        .kuarrz-footer {
            background: var(--kuarrz-secondary);
            color: rgba(255,255,255,0.7);
            padding: 80px 24px 40px;
        }

        .kuarrz-footer-content {
            max-width: 1100px;
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            min-width: 0;
        }

        .kuarrz-footer-brand {
            flex: 2;
            min-width: 300px;
            margin-bottom: 48px;
        }

        .kuarrz-footer-brand-name {
            color: var(--kuarrz-white);
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .kuarrz-footer-links {
            flex: 3;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 32px;
            margin-bottom: 48px;
            min-width: 0;
        }

        .kuarrz-footer-col h4 {
            color: var(--kuarrz-white);
            margin-bottom: 20px;
            font-size: 16px;
        }

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

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

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

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

        .kuarrz-copyright {
            width: 100%;
            padding-top: 40px;
            border-top: 1px solid rgba(255,255,255,0.1);
            text-align: center;
            font-size: 12px;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .kuarrz-nav-menu {
                display: none; /* 简化移动端，实际开发中会添加汉堡菜单 */
            }
            .kuarrz-hero-visual {
                display: none;
            }
            .kuarrz-hero-text {
                text-align: center;
            }
            .kuarrz-hero-subtitle {
                margin: 0 auto 48px;
            }
        }