:root {
            --kuarrz-primary: #ff6600;
            --kuarrz-primary-dark: #e65c00;
            --kuarrz-secondary: #ee1111;
            --kuarrz-bg-light: #ffffff;
            --kuarrz-bg-soft: #fcfcfd;
            --kuarrz-text-main: #222222;
            --kuarrz-text-muted: #666666;
            --kuarrz-accent: #f0f4f8;
            --kuarrz-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            --kuarrz-radius: 16px;
            --kuarrz-container: 1100px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Microsoft YaHei", sans-serif;
            color: var(--kuarrz-text-main);
            background-color: var(--kuarrz-bg-light);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: break-word;
        }

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

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

        .kuarrz-flex-item {
            min-width: 0;
        }

        /* 导航栏 */
        .kuarrz-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(15px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }

        .kuarrz-header.kuarrz-scrolled {
            box-shadow: var(--kuarrz-shadow);
            padding: 8px 0;
        }

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

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

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

        .kuarrz-nav-list {
            display: flex;
            list-style: none;
            gap: 24px;
            margin-left: 40px;
        }

        .kuarrz-nav-item a {
            text-decoration: none;
            color: var(--kuarrz-text-main);
            font-size: 15px;
            font-weight: 500;
            transition: color 0.3s;
            position: relative;
            padding: 4px 0;
        }

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

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

        .kuarrz-nav-item a.kuarrz-active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            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 {
            padding-top: 160px;
            padding-bottom: 96px;
            background: radial-gradient(circle at 90% 10%, #fff5f0 0%, #ffffff 50%);
            position: relative;
            overflow: hidden;
        }

        .kuarrz-hero-inner {
            display: flex;
            align-items: center;
            gap: 48px;
        }

        .kuarrz-hero-content {
            flex: 1.2;
            min-width: 0;
        }

        .kuarrz-hero-visual {
            flex: 0.8;
            min-width: 0;
            position: relative;
        }

        .kuarrz-hero-title {
            font-size: clamp(2rem, 4vw + 0.5rem, 3.5rem);
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 24px;
            background: linear-gradient(135deg, #222, #555);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            word-break: keep-all;
        }

        .kuarrz-hero-subtitle {
            font-size: clamp(1.1rem, 1vw + 0.5rem, 1.25rem);
            color: var(--kuarrz-text-muted);
            margin-bottom: 40px;
            max-width: 600px;
        }

        /* 模拟键盘视觉元素 */
        .kuarrz-keyboard-viz {
            background: #fff;
            border-radius: 24px;
            padding: 32px;
            box-shadow: 0 20px 50px rgba(0,0,0,0.08);
            border: 1px solid rgba(0,0,0,0.03);
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
            transform: perspective(1000px) rotateY(-10deg) rotateX(5deg);
        }

        .kuarrz-key-cap {
            aspect-ratio: 1;
            background: #f8f9fa;
            border-radius: 12px;
            border-bottom: 4px solid #dee2e6;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 1.2rem;
            color: var(--kuarrz-primary);
            transition: all 0.2s;
        }

        .kuarrz-key-cap:hover {
            transform: translateY(2px);
            border-bottom-width: 2px;
            background: var(--kuarrz-primary);
            color: white;
        }

        /* 快捷键卡片列表 */
        .kuarrz-shortcuts-section {
            padding: 96px 0;
            background-color: var(--kuarrz-bg-soft);
        }

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

        .kuarrz-section-title {
            font-size: clamp(1.5rem, 3vw, 2.5rem);
            font-weight: 700;
            margin-bottom: 16px;
        }

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

        .kuarrz-shortcut-card {
            background: white;
            padding: 40px;
            border-radius: var(--kuarrz-radius);
            box-shadow: var(--kuarrz-shadow);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .kuarrz-shortcut-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
        }

        .kuarrz-card-icon {
            width: 48px;
            height: 48px;
            background: var(--kuarrz-accent);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: var(--kuarrz-primary);
        }

        .kuarrz-shortcut-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 12px 0;
            border-bottom: 1px solid #f0f0f0;
        }

        .kuarrz-shortcut-item:last-child {
            border-bottom: none;
        }

        .kuarrz-kbd-group {
            display: flex;
            gap: 4px;
        }

        .kuarrz-kbd {
            background: #f1f3f5;
            border: 1px solid #dee2e6;
            border-radius: 4px;
            padding: 2px 8px;
            font-family: monospace;
            font-size: 13px;
            box-shadow: 0 2px 0 #dee2e6;
            font-weight: 600;
        }

        /* 动态内容区块标记示例 */
        .kuarrz-tutorial-section {
            padding: 96px 0;
            background: white;
        }

        .kuarrz-tutorial-box {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            align-items: center;
            background: #fff9f5;
            border-radius: 32px;
            padding: 64px;
        }

        .kuarrz-tutorial-text {
            flex: 1;
            min-width: 300px;
        }

        .kuarrz-tutorial-image {
            flex: 1;
            min-width: 300px;
            background: linear-gradient(45deg, var(--kuarrz-primary), var(--kuarrz-secondary));
            height: 300px;
            border-radius: 20px;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.2rem;
            font-weight: bold;
            text-align: center;
            padding: 40px;
        }

        /* 页脚 */
        .kuarrz-footer {
            background: #1a1a1a;
            color: #ffffff;
            padding: 80px 0 40px;
        }

        .kuarrz-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 64px;
        }

        .kuarrz-footer-brand h3 {
            font-size: 24px;
            margin-bottom: 16px;
            color: var(--kuarrz-primary);
        }

        .kuarrz-footer-links h4 {
            font-size: 18px;
            margin-bottom: 24px;
        }

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

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

        .kuarrz-footer-links a {
            color: #aaa;
            text-decoration: none;
            transition: color 0.3s;
        }

        .kuarrz-footer-links a:hover {
            color: white;
        }

        .kuarrz-copyright {
            padding-top: 40px;
            border-top: 1px solid #333;
            text-align: center;
            color: #666;
            font-size: 14px;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .kuarrz-nav-list {
                display: none; /* 简化演示，实际应为汉堡菜单 */
            }
            .kuarrz-hero-inner {
                flex-direction: column;
                text-align: center;
            }
            .kuarrz-hero-visual {
                display: none;
            }
            .kuarrz-tutorial-box {
                padding: 32px;
            }
            .kuarrz-tutorial-image {
                height: 200px;
            }
        }

        /* 按钮样式 */
        .kuarrz-btn {
            display: inline-block;
            padding: 14px 32px;
            border-radius: 30px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s;
            cursor: pointer;
            border: none;
        }

        .kuarrz-btn-primary {
            background: linear-gradient(to right, var(--kuarrz-primary), var(--kuarrz-secondary));
            color: white;
            box-shadow: 0 4px 15px rgba(255, 102, 0, 0.3);
        }

        .kuarrz-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(255, 102, 0, 0.4);
        }