:root {
            --ztdk-google-blue: #4285F4;
            --ztdk-google-red: #EA4335;
            --ztdk-google-yellow: #FBBC05;
            --ztdk-google-green: #34A853;
            --ztdk-bg-light: #f8f9fa;
            --ztdk-text-main: #202124;
            --ztdk-text-sub: #5f6368;
            --ztdk-white: #ffffff;
            --ztdk-gradient-speed: linear-gradient(135deg, #4285F4 0%, #34A853 100%);
            --ztdk-container-max: 1300px;
            --ztdk-radius: 20px;
            --ztdk-shadow: 0 10px 30px rgba(0,0,0,0.08);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            word-break: break-word;
            overflow-wrap: break-word;
        }

        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            color: var(--ztdk-text-main);
            line-height: 1.6;
            background-color: var(--ztdk-white);
            overflow-x: hidden;
        }

        /* 导航菜单 - 动态光迹效果 */
        .ztdk-header {
            position: fixed;
            top: 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: all 0.3s ease;
        }

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

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

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

        .ztdk-nav-menu {
            display: flex;
            list-style: none;
            gap: 12px;
            flex-wrap: wrap;
            min-width: 0;
        }

        .ztdk-nav-item a {
            text-decoration: none;
            color: var(--ztdk-text-sub);
            font-size: 14px;
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 8px;
            position: relative;
            transition: color 0.3s ease;
        }

        .ztdk-nav-item a:hover {
            color: var(--ztdk-google-blue);
        }

        /* 动态光迹悬停效果 */
        .ztdk-nav-item a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 2px;
            background: var(--ztdk-gradient-speed);
            transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
            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, 0.05);
        }

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

        /* Hero 区域 - 全屏艺术感布局 */
        .ztdk-hero {
            padding: 160px 24px 80px;
            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-direction: column;
            align-items: center;
            text-align: center;
        }

        .ztdk-hero-content {
            max-width: 900px;
            margin-bottom: 48px;
        }

        .ztdk-hero-title {
            font-size: clamp(2.5rem, 6vw + 1rem, 4.5rem);
            line-height: 1.1;
            font-weight: 800;
            letter-spacing: -2px;
            margin-bottom: 24px;
            background: linear-gradient(to right, #202124, #5f6368);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .ztdk-hero-subtitle {
            font-size: clamp(1.1rem, 2vw + 0.5rem, 1.4rem);
            color: var(--ztdk-text-sub);
            max-width: 700px;
            margin: 0 auto 32px;
        }

        .ztdk-hero-visual {
            width: 100%;
            max-width: 1100px;
            position: relative;
            border-radius: var(--ztdk-radius);
            overflow: hidden;
            box-shadow: 0 40px 100px rgba(0,0,0,0.12);
            transition: transform 0.5s ease;
        }

        .ztdk-hero-visual:hover {
            transform: scale(1.01);
        }

        .ztdk-hero-visual img {
            width: 100%;
            height: auto;
            display: block;
        }

        .ztdk-cta-group {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
            margin-top: 24px;
        }

        .ztdk-btn {
            padding: 18px 40px;
            border-radius: 50px;
            font-size: 18px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s ease;
            cursor: pointer;
            border: none;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }

        .ztdk-btn-primary {
            background: var(--ztdk-google-blue);
            color: var(--ztdk-white);
            box-shadow: 0 10px 20px rgba(66, 133, 244, 0.3);
        }

        .ztdk-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 15px 30px rgba(66, 133, 244, 0.4);
            background: #3367d6;
        }

        /* 杂志级节奏感板块：核心引擎 */
        .ztdk-section {
            padding: 96px 24px;
            max-width: var(--ztdk-container-max);
            margin: 0 auto;
        }

        .ztdk-grid-2 {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
            gap: 64px;
            align-items: center;
        }

        .ztdk-feature-text h2 {
            font-size: clamp(2rem, 4vw, 3rem);
            margin-bottom: 24px;
            line-height: 1.2;
        }

        .ztdk-feature-tag {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(66, 133, 244, 0.1);
            color: var(--ztdk-google-blue);
            border-radius: 30px;
            font-weight: 700;
            font-size: 14px;
            margin-bottom: 16px;
            text-transform: uppercase;
        }

        .ztdk-feature-card {
            background: var(--ztdk-bg-light);
            padding: 32px;
            border-radius: var(--ztdk-radius);
            margin-top: 24px;
            transition: all 0.3s ease;
        }

        .ztdk-feature-card:hover {
            background: var(--ztdk-white);
            box-shadow: var(--ztdk-shadow);
        }

        .ztdk-tech-badge {
            font-family: monospace;
            background: #eee;
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 13px;
        }

        /* 多平台下载板块 */
        .ztdk-platforms-section {
            background-color: #000;
            color: #fff;
            padding: 100px 24px;
            border-radius: 40px;
            margin: 48px 24px;
            overflow: hidden;
        }

        .ztdk-platforms-content {
            max-width: var(--ztdk-container-max);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            align-items: center;
        }

        .ztdk-platforms-img {
            flex: 1;
            min-width: 300px;
        }

        .ztdk-platforms-img img {
            width: 100%;
            border-radius: 20px;
            opacity: 0.9;
        }

        .ztdk-platforms-text {
            flex: 1;
            min-width: 300px;
        }

        .ztdk-platforms-text h2 {
            font-size: 3rem;
            margin-bottom: 24px;
        }

        /* 移动端协同 */
        .ztdk-mobile-synergy {
            background: linear-gradient(to bottom, #fff, #f0f4f8);
            padding-bottom: 0;
        }

        .ztdk-mobile-container {
            display: flex;
            flex-direction: row-reverse;
            align-items: center;
            gap: 48px;
        }

        .ztdk-mobile-img {
            flex: 1.2;
            min-width: 0;
        }

        .ztdk-mobile-img img {
            width: 100%;
            display: block;
            mask-image: linear-gradient(to bottom, black 80%, transparent 100%);
        }

        /* 页脚设计 */
        .ztdk-footer {
            background: var(--ztdk-white);
            padding: 80px 24px 40px;
            border-top: 1px solid #eee;
        }

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

        .ztdk-footer-brand {
            flex: 1;
            min-width: 200px;
        }

        .ztdk-footer-brand span {
            font-size: 24px;
            font-weight: 700;
            color: var(--ztdk-text-main);
            display: block;
            margin-bottom: 16px;
        }

        .ztdk-footer-links {
            flex: 2;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 32px;
        }

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

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

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

        .ztdk-footer-col ul li a {
            text-decoration: none;
            color: var(--ztdk-text-sub);
            font-size: 14px;
            transition: color 0.3s;
        }

        .ztdk-footer-col ul li a:hover {
            color: var(--ztdk-google-blue);
        }

        .ztdk-footer-bottom {
            max-width: var(--ztdk-container-max);
            margin: 64px auto 0;
            padding-top: 32px;
            border-top: 1px solid #eee;
            text-align: center;
            font-size: 13px;
            color: var(--ztdk-text-sub);
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .ztdk-grid-2 {
                grid-template-columns: 1fr;
            }
            .ztdk-nav-container {
                height: auto;
                padding: 16px;
            }
            .ztdk-nav-menu {
                margin-top: 16px;
                justify-content: center;
                gap: 8px;
            }
            .ztdk-hero {
                padding-top: 120px;
            }
            .ztdk-mobile-container {
                flex-direction: column;
            }
            .ztdk-platforms-text h2 {
                font-size: 2rem;
            }
        }