:root {
            --ztdk-primary: #4285F4;
            --ztdk-red: #EA4335;
            --ztdk-yellow: #FBBC05;
            --ztdk-green: #34A853;
            --ztdk-text-dark: #202124;
            --ztdk-text-light: #5f6368;
            --ztdk-bg-gray: #f8f9fa;
            --ztdk-white: #ffffff;
            --ztdk-spacing-unit: 8px;
            --ztdk-max-width: 1320px;
        }

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

        body {
            font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            color: var(--ztdk-text-dark);
            background-color: var(--ztdk-white);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: break-word;
        }

        /* 导航栏 - 动态光迹效果 */
        .ztdk-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            transition: box-shadow 0.3s ease;
        }

        .ztdk-header.ztdk-scrolled {
            box-shadow: 0 4px 20px rgba(0,0,0,0.08);
        }

        .ztdk-nav-container {
            max-width: var(--ztdk-max-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            min-height: 72px;
        }

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

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

        .ztdk-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 8px;
            min-width: 0;
        }

        .ztdk-nav-item a {
            text-decoration: none;
            color: var(--ztdk-text-light);
            font-size: 15px;
            font-weight: 500;
            padding: 12px 16px;
            position: relative;
            display: block;
            transition: color 0.3s ease;
        }

        .ztdk-nav-item a:hover,
        .ztdk-nav-item.ztdk-active a {
            color: var(--ztdk-primary);
        }

        /* 动态光迹悬停效果 */
        .ztdk-nav-item a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--ztdk-primary), var(--ztdk-red), var(--ztdk-yellow), var(--ztdk-green));
            transition: width 0.4s cubic-bezier(0.23, 1, 0.32, 1), left 0.4s cubic-bezier(0.23, 1, 0.32, 1);
            border-radius: 3px;
        }

        .ztdk-nav-item a:hover::after,
        .ztdk-nav-item.ztdk-active a::after {
            width: 80%;
            left: 10%;
        }

        /* Hero 区 - 对角线分割布局 */
        .ztdk-hero {
            padding: 160px 24px 100px;
            background: radial-gradient(circle at 90% 10%, rgba(66, 133, 244, 0.05) 0%, transparent 40%),
                        radial-gradient(circle at 10% 90%, rgba(52, 168, 83, 0.05) 0%, transparent 40%);
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            text-align: center;
            position: relative;
        }

        .ztdk-hero-content {
            max-width: 900px;
            min-width: 0;
            z-index: 2;
        }

        .ztdk-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
            line-height: 1.1;
            font-weight: 800;
            color: var(--ztdk-text-dark);
            margin-bottom: 24px;
            letter-spacing: -0.02em;
        }

        .ztdk-hero-subtitle {
            font-size: clamp(1.1rem, 1.5vw + 0.5rem, 1.4rem);
            color: var(--ztdk-text-light);
            margin-bottom: 48px;
            max-width: 750px;
            margin-left: auto;
            margin-right: auto;
        }

        .ztdk-download-btn-wrapper {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
            margin-bottom: 32px;
        }

        .ztdk-btn-primary {
            background-color: var(--ztdk-primary);
            color: var(--ztdk-white);
            padding: 18px 48px;
            border-radius: 50px;
            font-size: 18px;
            font-weight: 600;
            text-decoration: none;
            box-shadow: 0 10px 30px rgba(66, 133, 244, 0.3);
            transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            border: none;
            cursor: pointer;
        }

        .ztdk-btn-primary:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 40px rgba(66, 133, 244, 0.4);
            background-color: #3367d6;
        }

        /* 核心架构区 - 3D渲染卡片风格 */
        .ztdk-section {
            padding: 96px 24px;
            max-width: var(--ztdk-max-width);
            margin: 0 auto;
        }

        .ztdk-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
            width: 100%;
        }

        .ztdk-card {
            background: var(--ztdk-white);
            border-radius: 24px;
            padding: 40px;
            border: 1px solid rgba(0,0,0,0.05);
            transition: all 0.4s ease;
            display: flex;
            flex-direction: column;
            min-width: 0;
            position: relative;
            overflow: hidden;
        }

        .ztdk-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 50px rgba(0,0,0,0.1);
            border-color: var(--ztdk-primary);
        }

        .ztdk-card-tag {
            font-size: 12px;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.1em;
            color: var(--ztdk-primary);
            margin-bottom: 16px;
        }

        .ztdk-card-title {
            font-size: 24px;
            margin-bottom: 16px;
            font-weight: 700;
        }

        .ztdk-card-desc {
            color: var(--ztdk-text-light);
            font-size: 16px;
            line-height: 1.7;
        }

        /* 协同矩阵区 - 杂志级图文节奏 */
        .ztdk-synergy-section {
            background-color: var(--ztdk-bg-gray);
            padding: 96px 0;
        }

        .ztdk-synergy-content {
            max-width: var(--ztdk-max-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
        }

        .ztdk-synergy-visual {
            flex: 1;
            min-width: 320px;
            position: relative;
        }

        .ztdk-visual-placeholder {
            width: 100%;
            aspect-ratio: 4/3;
            background: linear-gradient(135deg, #e0e0e0 0%, #f5f5f5 100%);
            border-radius: 32px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 20px 20px 60px rgba(0,0,0,0.05);
        }

        .ztdk-synergy-text {
            flex: 1;
            min-width: 320px;
        }

        .ztdk-section-title {
            font-size: clamp(2rem, 3vw, 2.5rem);
            margin-bottom: 24px;
            font-weight: 800;
        }

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

        .ztdk-feature-item {
            margin-bottom: 32px;
            padding-left: 24px;
            border-left: 4px solid var(--ztdk-primary);
        }

        .ztdk-feature-item h4 {
            font-size: 18px;
            margin-bottom: 8px;
        }

        .ztdk-feature-item p {
            color: var(--ztdk-text-light);
        }

        /* 页脚 */
        .ztdk-footer {
            background: #1a1a1a;
            color: rgba(255,255,255,0.7);
            padding: 80px 24px 40px;
        }

        .ztdk-footer-container {
            max-width: var(--ztdk-max-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
        }

        .ztdk-footer-brand {
            flex: 1;
            min-width: 280px;
        }

        .ztdk-footer-title {
            color: #fff;
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 24px;
        }

        .ztdk-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 64px;
            flex: 2;
        }

        .ztdk-footer-group {
            min-width: 150px;
        }

        .ztdk-footer-group h5 {
            color: #fff;
            margin-bottom: 20px;
            font-size: 16px;
        }

        .ztdk-footer-group ul {
            list-style: none;
        }

        .ztdk-footer-group li {
            margin-bottom: 12px;
        }

        .ztdk-footer-group a {
            color: rgba(255,255,255,0.5);
            text-decoration: none;
            transition: color 0.3s ease;
        }

        .ztdk-footer-group a:hover {
            color: var(--ztdk-primary);
        }

        .ztdk-copyright {
            margin-top: 64px;
            padding-top: 32px;
            border-top: 1px solid rgba(255,255,255,0.1);
            text-align: center;
            width: 100%;
            font-size: 14px;
        }

        /* 响应式调整 */
        @media (max-width: 1024px) {
            .ztdk-nav-menu {
                display: none; /* 简化处理，实际开发可加汉堡菜单 */
            }
        }

        @media (max-width: 768px) {
            .ztdk-hero {
                padding: 120px 24px 60px;
            }
            .ztdk-grid {
                grid-template-columns: 1fr;
            }
            .ztdk-synergy-content {
                gap: 32px;
            }
        }