: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: #ffffff;
            --ztdk-bg-gray: #f8f9fa;
            --ztdk-transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
            --ztdk-container-width: 1300px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            -webkit-font-smoothing: antialiased;
        }

        body {
            font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            color: var(--ztdk-text-main);
            line-height: 1.6;
            background-color: var(--ztdk-bg-light);
            overflow-x: hidden;
        }

        /* 导航系统 - 动态光迹效果 */
        .ztdk-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(15px);
            z-index: 1000;
            border-bottom: 1px solid rgba(0,0,0,0.05);
            transition: var(--ztdk-transition);
        }

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

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

        .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: clamp(0.85rem, 1vw + 0.2rem, 1rem);
            font-weight: 500;
            padding: 8px 12px;
            position: relative;
            transition: var(--ztdk-transition);
            display: block;
            word-break: keep-all;
        }

        /* 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-google-blue), var(--ztdk-google-red), var(--ztdk-google-yellow), var(--ztdk-google-green));
            transition: var(--ztdk-transition);
            transform: translateX(-50%);
            border-radius: 2px;
        }

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

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

        /* Hero 视觉区 - 杂志级分层布局 */
        .ztdk-hero {
            padding-top: 140px;
            padding-bottom: 80px;
            position: relative;
            background: radial-gradient(circle at top right, rgba(66, 133, 244, 0.05), transparent);
        }

        .ztdk-hero-wrapper {
            max-width: var(--ztdk-container-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 48px;
        }

        .ztdk-hero-text {
            flex: 1;
            min-width: 320px;
            word-break: break-word;
        }

        .ztdk-hero-tag {
            display: inline-block;
            background: rgba(66, 133, 244, 0.1);
            color: var(--ztdk-google-blue);
            padding: 6px 16px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            margin-bottom: 24px;
        }

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

        .ztdk-hero-subtitle {
            font-size: clamp(1.1rem, 1.5vw + 0.5rem, 1.35rem);
            color: var(--ztdk-text-sub);
            max-width: 600px;
            margin-bottom: 40px;
        }

        .ztdk-hero-image {
            flex: 1.2;
            min-width: 320px;
            position: relative;
        }

        .ztdk-image-frame {
            border-radius: 24px;
            overflow: hidden;
            box-shadow: 0 40px 80px rgba(0,0,0,0.12);
            transform: perspective(1000px) rotateY(-5deg);
            transition: var(--ztdk-transition);
        }

        .ztdk-image-frame:hover {
            transform: perspective(1000px) rotateY(0deg);
        }

        .ztdk-image-frame img {
            width: 100%;
            display: block;
            object-fit: cover;
        }

        /* 核心优势区块 - 网格布局 */
        .ztdk-section {
            padding: 96px 0;
            max-width: var(--ztdk-container-width);
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

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

        .ztdk-feature-card {
            background: var(--ztdk-bg-gray);
            padding: 48px;
            border-radius: 24px;
            border: 1px solid rgba(0,0,0,0.03);
            transition: var(--ztdk-transition);
            min-width: 0;
            word-break: break-word;
        }

        .ztdk-feature-card:hover {
            background: #fff;
            box-shadow: 0 20px 40px rgba(0,0,0,0.05);
            transform: translateY(-8px);
        }

        .ztdk-card-icon {
            font-size: 2.5rem;
            margin-bottom: 24px;
        }

        .ztdk-card-title {
            font-size: 1.5rem;
            margin-bottom: 16px;
            font-weight: 700;
        }

        /* 开发者深度展示区 - 左右对撞布局 */
        .ztdk-split-section {
            display: flex;
            align-items: center;
            gap: 64px;
            flex-wrap: wrap;
            margin-bottom: 96px;
        }

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

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

        .ztdk-split-image img {
            width: 100%;
            border-radius: 32px;
            box-shadow: 20px 20px 60px rgba(0,0,0,0.08);
        }

        .ztdk-accent-text {
            color: var(--ztdk-google-green);
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 2px;
            margin-bottom: 16px;
            display: block;
        }

        /* 按钮设计 */
        .ztdk-btn {
            display: inline-block;
            padding: 16px 36px;
            border-radius: 12px;
            font-weight: 600;
            text-decoration: none;
            transition: var(--ztdk-transition);
            cursor: pointer;
            border: none;
            font-size: 1.1rem;
        }

        .ztdk-btn-primary {
            background: var(--ztdk-google-blue);
            color: #fff;
            box-shadow: 0 8px 24px rgba(66, 133, 244, 0.3);
        }

        .ztdk-btn-primary:hover {
            background: #3367d6;
            transform: scale(1.05);
            box-shadow: 0 12px 32px rgba(66, 133, 244, 0.4);
        }

        /* 页脚品牌区 */
        .ztdk-footer {
            background: #202124;
            color: #fff;
            padding: 80px 0 40px;
        }

        .ztdk-footer-container {
            max-width: var(--ztdk-container-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            flex-wrap: wrap;
            gap: 64px;
            justify-content: space-between;
        }

        .ztdk-footer-brand {
            flex: 1;
            min-width: 250px;
        }

        .ztdk-footer-brand-name {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 24px;
            background: linear-gradient(90deg, #fff, #9aa0a6);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .ztdk-footer-links {
            flex: 2;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 40px;
            min-width: 0;
        }

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

        .ztdk-footer-list-title {
            color: #9aa0a6;
            font-weight: 600;
            margin-bottom: 20px;
            text-transform: uppercase;
            font-size: 0.85rem;
        }

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

        .ztdk-footer-list a {
            color: #e8eaed;
            text-decoration: none;
            transition: var(--ztdk-transition);
            font-size: 0.95rem;
        }

        .ztdk-footer-list a:hover {
            color: var(--ztdk-google-blue);
            padding-left: 4px;
        }

        .ztdk-copyright {
            width: 100%;
            text-align: center;
            padding-top: 60px;
            border-top: 1px solid rgba(255,255,255,0.1);
            margin-top: 60px;
            color: #9aa0a6;
            font-size: 0.9rem;
        }

        /* 响应式调整 */
        @media (max-width: 1024px) {
            .ztdk-hero-wrapper {
                flex-direction: column;
                text-align: center;
            }
            .ztdk-hero-subtitle {
                margin-left: auto;
                margin-right: auto;
            }
            .ztdk-image-frame {
                transform: none;
            }
        }

        @media (max-width: 768px) {
            .ztdk-nav-menu {
                display: none; /* 简化演示，实际应有汉堡菜单 */
            }
            .ztdk-hero {
                padding-top: 100px;
            }
            .ztdk-split-section {
                flex-direction: column;
            }
            .ztdk-hero-title {
                font-size: 2.8rem;
            }
        }