:root {
            --ztdk-google-blue: #4285F4;
            --ztdk-google-red: #EA4335;
            --ztdk-google-yellow: #FBBC05;
            --ztdk-google-green: #34A853;
            --ztdk-text-main: #202124;
            --ztdk-text-light: #5f6368;
            --ztdk-bg-soft: #f8f9fa;
            --ztdk-white: #ffffff;
            --ztdk-transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
        }

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

        body {
            font-family: "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--ztdk-text-main);
            line-height: 1.6;
            background-color: var(--ztdk-white);
            overflow-x: hidden;
            word-break: keep-all;
            overflow-wrap: break-word;
        }

        /* 导航栏样式 - 动态光迹效果 */
        .ztdk-navbar {
            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);
            padding: 0 5%;
        }

        .ztdk-nav-container {
            max-width: 1400px;
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            height: 72px;
        }

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

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

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

        .ztdk-nav-item a {
            text-decoration: none;
            color: var(--ztdk-text-light);
            font-size: 0.95rem;
            font-weight: 500;
            padding: 8px 16px;
            border-radius: 20px;
            transition: var(--ztdk-transition);
            position: relative;
            display: inline-block;
        }

        /* 动态光迹悬停效果 */
        .ztdk-nav-item a:hover {
            color: var(--ztdk-google-blue);
        }

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

        .ztdk-nav-item.ztdk-active a {
            color: var(--ztdk-google-blue);
            background: rgba(66, 133, 244, 0.08);
        }

        /* Hero 区块 - 杂志级节奏布局 */
        .ztdk-hero {
            padding: 160px 5% 96px;
            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;
            align-items: center;
            min-height: 80vh;
        }

        .ztdk-hero-content {
            max-width: 900px;
            text-align: center;
            min-width: 0;
        }

        .ztdk-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: 24px;
            line-height: 1.1;
            background: linear-gradient(135deg, #202124 0%, #5f6368 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .ztdk-hero-subtitle {
            font-size: clamp(1.1rem, 1.5vw + 0.5rem, 1.4rem);
            color: var(--ztdk-text-light);
            margin-bottom: 48px;
            max-width: 760px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.8;
        }

        .ztdk-cta-group {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 24px;
        }

        .ztdk-btn-primary {
            background: var(--ztdk-google-blue);
            color: white;
            padding: 18px 48px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.1rem;
            box-shadow: 0 4px 15px rgba(66, 133, 244, 0.3);
            transition: var(--ztdk-transition);
        }

        .ztdk-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(66, 133, 244, 0.4);
        }

        /* 技术架构分层 - 3D渲染风格卡片 */
        .ztdk-tech-section {
            padding: 96px 5%;
            background-color: var(--ztdk-bg-soft);
        }

        .ztdk-container-wide {
            max-width: 1100px;
            margin: 0 auto;
        }

        .ztdk-section-header {
            margin-bottom: 64px;
            text-align: left;
        }

        .ztdk-badge {
            display: inline-block;
            padding: 4px 16px;
            background: rgba(66, 133, 244, 0.1);
            color: var(--ztdk-google-blue);
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 700;
            margin-bottom: 16px;
            text-transform: uppercase;
        }

        .ztdk-grid-2 {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 48px;
        }

        .ztdk-card-3d {
            background: var(--ztdk-white);
            padding: 48px;
            border-radius: 24px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.03);
            transition: var(--ztdk-transition);
            border: 1px solid rgba(0,0,0,0.02);
            position: relative;
            overflow: hidden;
        }

        .ztdk-card-3d:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.08);
        }

        .ztdk-card-3d::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 6px;
            height: 100%;
            background: var(--ztdk-google-blue);
        }

        .ztdk-card-3d.ztdk-security-card::before {
            background: var(--ztdk-google-green);
        }

        .ztdk-card-title {
            font-size: 1.75rem;
            font-weight: 700;
            margin-bottom: 24px;
        }

        .ztdk-tech-list {
            list-style: none;
            margin-top: 24px;
        }

        .ztdk-tech-tag {
            display: inline-block;
            margin: 4px 8px 4px 0;
            padding: 6px 14px;
            background: #f1f3f4;
            border-radius: 8px;
            font-size: 0.85rem;
            color: var(--ztdk-text-light);
        }

        /* 生产力协同矩阵 - 交替布局 */
        .ztdk-synergy-section {
            padding: 96px 5%;
        }

        .ztdk-flex-row {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            margin-bottom: 96px;
            gap: 64px;
        }

        .ztdk-flex-row:nth-child(even) {
            flex-direction: row-reverse;
        }

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

        .ztdk-visual-placeholder {
            background: linear-gradient(45deg, #f8f9fa, #e8eaed);
            border-radius: 32px;
            height: 400px;
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            overflow: hidden;
        }

        /* 模拟动态光迹 */
        .ztdk-visual-placeholder::after {
            content: '';
            position: absolute;
            width: 200%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(66, 133, 244, 0.1), transparent);
            animation: lightMove 4s infinite linear;
        }

        @keyframes lightMove {
            0% { transform: translateX(-100%); }
            100% { transform: translateX(100%); }
        }

        /* 动态内容区块标记 */
        .ztdk-news-section {
            padding: 96px 5%;
            background: #fff;
        }

        /* 页脚 */
        .ztdk-footer {
            padding: 64px 5% 32px;
            border-top: 1px solid #eee;
            background: #fff;
        }

        .ztdk-footer-container {
            max-width: 1100px;
            margin: 0 auto;
            text-align: center;
        }

        .ztdk-footer-brand {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--ztdk-text-main);
            margin-bottom: 24px;
        }

        .ztdk-footer-links {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 24px;
            margin-bottom: 32px;
            list-style: none;
        }

        .ztdk-footer-links a {
            text-decoration: none;
            color: var(--ztdk-text-light);
            font-size: 0.9rem;
        }

        .ztdk-copyright {
            font-size: 0.85rem;
            color: #9aa0a6;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .ztdk-nav-menu {
                display: none; /* 简化移动端，实际开发中应使用汉堡菜单 */
            }
            .ztdk-hero {
                padding-top: 120px;
            }
            .ztdk-flex-row {
                margin-bottom: 64px;
                gap: 32px;
            }
            .ztdk-visual-placeholder {
                height: 280px;
            }
        }