:root {
            --ztdk-google-blue: #4285F4;
            --ztdk-google-red: #EA4335;
            --ztdk-google-yellow: #FBBC05;
            --ztdk-google-green: #34A853;
            --ztdk-text-main: #202124;
            --ztdk-text-sub: #5f6368;
            --ztdk-bg-light: #f8f9fa;
            --ztdk-white: #ffffff;
            --ztdk-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        body {
            font-family: 'Segoe UI', Roboto, Helvetica, Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--ztdk-text-main);
            line-height: 1.6;
            background-color: var(--ztdk-white);
            overflow-x: hidden;
        }

        /* 布局容器 */
        .ztdk-container {
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* 导航栏设计 - 毛玻璃与动态光迹 */
        .ztdk-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
        }

        .ztdk-nav-wrapper {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            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;
        }

        .ztdk-nav-item {
            position: relative;
        }

        .ztdk-nav-link {
            text-decoration: none;
            color: var(--ztdk-text-sub);
            font-size: 14px;
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 6px;
            transition: var(--ztdk-transition);
            display: block;
            white-space: nowrap;
        }

        /* 动态光迹悬停效果 */
        .ztdk-nav-link:hover {
            color: var(--ztdk-google-blue);
            background: rgba(66, 133, 244, 0.05);
        }

        .ztdk-nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--ztdk-google-blue), var(--ztdk-google-red), var(--ztdk-google-yellow), var(--ztdk-google-green));
            transition: var(--ztdk-transition);
            transform: translateX(-50%);
        }

        .ztdk-nav-link:hover::after {
            width: 80%;
        }

        .ztdk-nav-link.ztdk-active {
            color: var(--ztdk-google-blue);
            font-weight: 700;
        }

        /* Hero 区 - 杂志感非对称布局 */
        .ztdk-hero {
            padding: 160px 0 80px;
            background: radial-gradient(circle at top right, rgba(66,133,244,0.05), transparent 40%),
                        radial-gradient(circle at bottom left, rgba(52,168,83,0.05), transparent 40%);
            position: relative;
            overflow: hidden;
        }

        .ztdk-hero-content {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 48px;
        }

        .ztdk-hero-text {
            flex: 1;
            min-width: 300px;
            word-break: keep-all;
        }

        .ztdk-hero-title {
            font-size: clamp(2.5rem, 5vw, 3.5rem);
            line-height: 1.1;
            margin-bottom: 24px;
            font-weight: 800;
            letter-spacing: -1px;
        }

        .ztdk-hero-subtitle {
            font-size: clamp(1rem, 2vw + 0.5rem, 1.25rem);
            color: var(--ztdk-text-sub);
            margin-bottom: 32px;
            max-width: 600px;
        }

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

        /* 抽象3D视觉块代替图片 */
        .ztdk-abstract-3d {
            width: 100%;
            height: 400px;
            background: var(--ztdk-bg-light);
            border-radius: 24px;
            position: relative;
            display: flex;
            justify-content: center;
            align-items: center;
            box-shadow: 0 20px 40px rgba(0,0,0,0.05);
            border: 1px solid rgba(0,0,0,0.05);
        }

        .ztdk-error-badge {
            background: var(--ztdk-white);
            padding: 24px;
            border-radius: 16px;
            box-shadow: 0 10px 30px rgba(234, 67, 53, 0.1);
            border-left: 4px solid var(--ztdk-google-red);
            transform: rotate(-5deg);
        }

        /* 核心技术层区块 */
        .ztdk-section {
            padding: 96px 0;
        }

        .ztdk-tech-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
            margin-top: 48px;
        }

        .ztdk-tech-card {
            background: var(--ztdk-bg-light);
            padding: 40px;
            border-radius: 20px;
            transition: var(--ztdk-transition);
            border: 1px solid transparent;
        }

        .ztdk-tech-card:hover {
            transform: translateY(-10px);
            background: var(--ztdk-white);
            box-shadow: 0 20px 40px rgba(0,0,0,0.08);
            border-color: var(--ztdk-google-blue);
        }

        .ztdk-tech-tag {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(66, 133, 244, 0.1);
            color: var(--ztdk-google-blue);
            border-radius: 20px;
            font-size: 12px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .ztdk-tech-title {
            font-size: 24px;
            margin-bottom: 16px;
        }

        .ztdk-tech-detail {
            color: var(--ztdk-text-sub);
            font-size: 15px;
            word-break: break-word;
        }

        /* 解决策略矩阵 */
        .ztdk-matrix-section {
            background-color: var(--ztdk-text-main);
            color: var(--ztdk-white);
            border-radius: 40px;
            margin: 48px 24px;
            padding: 80px 40px;
        }

        .ztdk-matrix-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
        }

        .ztdk-matrix-item {
            flex: 1;
            min-width: 260px;
        }

        .ztdk-matrix-num {
            font-size: 48px;
            font-weight: 800;
            opacity: 0.3;
            font-family: serif;
            margin-bottom: 8px;
        }

        /* 按钮设计 */
        .ztdk-btn-primary {
            display: inline-block;
            background: var(--ztdk-google-blue);
            color: var(--ztdk-white);
            padding: 16px 40px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            font-size: 18px;
            transition: var(--ztdk-transition);
            box-shadow: 0 4px 14px rgba(66, 133, 244, 0.3);
            border: none;
            cursor: pointer;
        }

        .ztdk-btn-primary:hover {
            transform: scale(1.05);
            box-shadow: 0 6px 20px rgba(66, 133, 244, 0.4);
            background: #3367d6;
        }

        /* 页脚品牌区 */
        .ztdk-footer {
            background: var(--ztdk-bg-light);
            padding: 80px 0 40px;
            border-top: 1px solid rgba(0,0,0,0.05);
        }

        .ztdk-footer-brand {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 24px;
            color: var(--ztdk-text-main);
        }

        .ztdk-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
            margin-bottom: 48px;
        }

        .ztdk-footer-link {
            display: block;
            color: var(--ztdk-text-sub);
            text-decoration: none;
            font-size: 14px;
            margin-bottom: 12px;
            transition: var(--ztdk-transition);
        }

        .ztdk-footer-link:hover {
            color: var(--ztdk-google-blue);
        }

        .ztdk-copyright {
            padding-top: 40px;
            border-top: 1px solid rgba(0,0,0,0.05);
            text-align: center;
            font-size: 13px;
            color: #9aa0a6;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .ztdk-nav-menu {
                display: none; /* 简化移动端，实际项目中可加汉堡菜单 */
            }
            .ztdk-hero {
                padding: 120px 0 60px;
                text-align: center;
            }
            .ztdk-hero-content {
                flex-direction: column;
            }
            .ztdk-hero-subtitle {
                margin-left: auto;
                margin-right: auto;
            }
            .ztdk-matrix-section {
                margin: 24px 12px;
                padding: 40px 24px;
            }
        }