:root {
            --ztdk-primary: #4285F4;
            --ztdk-success: #34A853;
            --ztdk-warning: #FBBC05;
            --ztdk-danger: #EA4335;
            --ztdk-bg-dark: #202124;
            --ztdk-bg-card: #292a2d;
            --ztdk-text-main: #e8eaed;
            --ztdk-text-muted: #9aa0a6;
            --ztdk-accent-gradient: linear-gradient(135deg, #4285F4, #34A853, #FBBC05, #EA4335);
            --ztdk-spacing-unit: 8px;
            --ztdk-container-width: 1400px;
        }

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

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

        /* 导航栏设计：动态光迹毛玻璃 */
        .ztdk-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(32, 33, 36, 0.85);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        .ztdk-nav-container {
            max-width: var(--ztdk-container-width);
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 48px;
            height: 80px;
        }

        .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: 24px;
            min-width: 0;
        }

        .ztdk-nav-item a {
            text-decoration: none;
            color: var(--ztdk-text-muted);
            font-size: 14px;
            font-weight: 500;
            position: relative;
            padding: 8px 0;
            transition: color 0.3s ease;
        }

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

        /* 动态光迹悬停效果 */
        .ztdk-nav-item a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--ztdk-accent-gradient);
            transition: width 0.3s ease;
        }

        .ztdk-nav-item a:hover::after, .ztdk-nav-item.ztdk-active a::after {
            width: 100%;
        }

        /* Hero 区：全屏背景+对角线分割感 */
        .ztdk-hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            padding: 120px 48px 80px;
            position: relative;
            overflow: hidden;
            background: radial-gradient(circle at 80% 20%, rgba(66, 133, 244, 0.15), transparent 40%),
                        radial-gradient(circle at 10% 80%, rgba(52, 168, 83, 0.1), transparent 40%);
        }

        .ztdk-hero-content {
            max-width: 800px;
            z-index: 2;
        }

        .ztdk-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
            line-height: 1.1;
            font-weight: 800;
            margin-bottom: 24px;
            background: linear-gradient(to right, #fff, #9aa0a6);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            word-break: break-word;
        }

        .ztdk-hero-subtitle {
            font-size: clamp(1rem, 2vw + 0.5rem, 1.25rem);
            color: var(--ztdk-text-muted);
            max-width: 600px;
            margin-bottom: 48px;
            word-break: break-word;
        }

        .ztdk-download-btn {
            display: inline-flex;
            align-items: center;
            padding: 18px 48px;
            background: var(--ztdk-primary);
            color: #fff;
            text-decoration: none;
            border-radius: 50px;
            font-weight: 600;
            font-size: 18px;
            transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.3s ease;
            box-shadow: 0 10px 30px rgba(66, 133, 244, 0.3);
        }

        .ztdk-download-btn:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 40px rgba(66, 133, 244, 0.5);
        }

        /* 3D 渲染风格装饰 - CSS 实现 */
        .ztdk-hero-visual {
            position: absolute;
            right: 5%;
            top: 50%;
            transform: translateY(-50%);
            width: 500px;
            height: 500px;
            background: rgba(255, 255, 255, 0.03);
            border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
            filter: blur(40px);
            animation: morph 15s linear infinite alternate;
            z-index: 1;
        }

        @keyframes morph {
            0% { border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%; }
            100% { border-radius: 70% 30% 30% 70% / 70% 70% 30% 30%; }
        }

        /* 技术架构区：多维卡片 */
        .ztdk-tech-section {
            padding: 96px 48px;
            max-width: var(--ztdk-container-width);
            margin: 0 auto;
        }

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

        .ztdk-section-title {
            font-size: clamp(1.5rem, 3vw, 2.5rem);
            margin-bottom: 64px;
        }

        .ztdk-grid-layout {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
            gap: 32px;
        }

        .ztdk-tech-card {
            background: var(--ztdk-bg-card);
            border-radius: 24px;
            padding: 48px;
            position: relative;
            overflow: hidden;
            transition: transform 0.4s ease, background 0.4s ease;
            min-width: 0;
        }

        .ztdk-tech-card:hover {
            transform: scale(1.02);
            background: #323336;
        }

        .ztdk-tech-card h3 {
            font-size: 24px;
            margin-bottom: 16px;
            color: #fff;
        }

        .ztdk-tech-card p {
            color: var(--ztdk-text-muted);
            margin-bottom: 24px;
        }

        .ztdk-tech-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }

        .ztdk-tag {
            padding: 6px 16px;
            background: rgba(255, 255, 255, 0.05);
            border-radius: 100px;
            font-size: 12px;
            color: var(--ztdk-text-muted);
        }

        /* 无痕模式特色区：杂志级节奏感 */
        .ztdk-privacy-feature {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
            padding: 96px 48px;
            max-width: var(--ztdk-container-width);
            margin: 0 auto;
        }

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

        .ztdk-feature-visual {
            flex: 1;
            min-width: 300px;
            height: 400px;
            background: linear-gradient(45deg, #1a1b1e, #292a2d);
            border-radius: 32px;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 40px 80px rgba(0,0,0,0.5);
        }

        /* 模拟无痕模式图标 */
        .ztdk-incognito-icon {
            width: 120px;
            height: 120px;
            border: 4px solid var(--ztdk-text-main);
            border-radius: 50%;
            position: relative;
            opacity: 0.8;
        }

        .ztdk-incognito-icon::before, .ztdk-incognito-icon::after {
            content: '';
            position: absolute;
            background: var(--ztdk-text-main);
        }

        .ztdk-incognito-icon::before {
            width: 140%;
            height: 10px;
            top: -20px;
            left: -20%;
            border-radius: 5px;
        }

        .ztdk-incognito-icon::after {
            width: 100%;
            height: 40px;
            top: -60px;
            left: 0;
            border-radius: 10px 10px 0 0;
            clip-path: polygon(20% 0%, 80% 0%, 100% 100%, 0% 100%);
        }

        /* 协同矩阵区块 */
        .ztdk-synergy-section {
            background: #1a1b1e;
            padding: 96px 48px;
        }

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

        .ztdk-synergy-item {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: flex-start;
            padding: 48px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            min-width: 0;
        }

        .ztdk-synergy-info {
            flex: 1;
            min-width: 300px;
            padding-right: 48px;
        }

        .ztdk-synergy-level {
            font-size: 14px;
            color: var(--ztdk-success);
            margin-bottom: 8px;
            display: block;
        }

        /* 页脚 */
        .ztdk-footer {
            padding: 96px 48px 48px;
            background: var(--ztdk-bg-dark);
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }

        .ztdk-footer-grid {
            max-width: var(--ztdk-container-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 64px;
        }

        .ztdk-footer-brand h2 {
            font-size: 24px;
            margin-bottom: 16px;
            background: var(--ztdk-accent-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .ztdk-footer-links h4 {
            color: #fff;
            margin-bottom: 24px;
            font-size: 16px;
        }

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

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

        .ztdk-footer-links a {
            color: var(--ztdk-text-muted);
            text-decoration: none;
            font-size: 14px;
            transition: color 0.3s ease;
        }

        .ztdk-footer-links a:hover {
            color: #fff;
        }

        .ztdk-copyright {
            max-width: var(--ztdk-container-width);
            margin: 0 auto;
            text-align: center;
            color: var(--ztdk-text-muted);
            font-size: 12px;
            padding-top: 48px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }

        /* 响应式适配 */
        @media (max-width: 768px) {
            .ztdk-nav-container {
                padding: 0 24px;
                height: auto;
                flex-direction: column;
                padding-bottom: 16px;
            }
            .ztdk-nav-menu {
                justify-content: center;
                gap: 12px;
                margin-top: 16px;
            }
            .ztdk-hero {
                padding: 160px 24px 80px;
                text-align: center;
            }
            .ztdk-hero-visual {
                display: none;
            }
            .ztdk-grid-layout {
                grid-template-columns: 1fr;
            }
            .ztdk-privacy-feature {
                flex-direction: column;
                text-align: center;
            }
            .ztdk-synergy-info {
                padding-right: 0;
                margin-bottom: 24px;
            }
        }