:root {
            --ztdk-primary: #4285F4;
            --ztdk-success: #34A853;
            --ztdk-warning: #FBBC05;
            --ztdk-danger: #EA4335;
            --ztdk-text-main: #202124;
            --ztdk-text-sub: #5f6368;
            --ztdk-bg-light: #ffffff;
            --ztdk-bg-gray: #f8f9fa;
            --ztdk-container-width: 1100px;
            --ztdk-transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            color: var(--ztdk-text-main);
            line-height: 1.7;
            background-color: var(--ztdk-bg-light);
            word-break: keep-all;
            overflow-x: hidden;
        }

        /* Typography */
        h1, h2, h3 {
            line-height: 1.2;
            word-break: break-word;
            white-space: normal;
        }

        .ztdk-fluid-h1 { font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem); font-weight: 800; }
        .ztdk-fluid-h2 { font-size: clamp(1.8rem, 3vw + 0.5rem, 2.8rem); font-weight: 700; }
        .ztdk-fluid-p { font-size: clamp(1rem, 1vw + 0.5rem, 1.25rem); color: var(--ztdk-text-sub); }

        /* Navigation */
        .ztdk-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(15px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
        }

        .ztdk-nav-container {
            max-width: var(--ztdk-container-width);
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 1rem 24px;
        }

        .ztdk-logo {
            flex-shrink: 0;
            width: 160px;
        }

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

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

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

        /* 动态光迹悬停效果 */
        .ztdk-menu-item a:hover {
            color: var(--ztdk-primary);
            background: rgba(66, 133, 244, 0.05);
        }

        .ztdk-menu-item a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--ztdk-primary), var(--ztdk-success), var(--ztdk-warning));
            transition: var(--ztdk-transition);
            transform: translateX(-50%);
        }

        .ztdk-menu-item a:hover::after {
            width: 60%;
        }

        .ztdk-menu-item.ztdk-active a {
            color: var(--ztdk-primary);
            background: rgba(66, 133, 244, 0.1);
        }

        /* Hero Section */
        .ztdk-hero {
            padding: 160px 24px 80px;
            background: radial-gradient(circle at 90% 10%, rgba(66, 133, 244, 0.08) 0%, transparent 40%),
                        radial-gradient(circle at 10% 90%, rgba(52, 168, 83, 0.08) 0%, transparent 40%);
            min-height: 80vh;
            display: flex;
            align-items: center;
        }

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

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

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

        .ztdk-sync-box {
            background: white;
            padding: 40px;
            border-radius: 32px;
            box-shadow: 0 24px 48px rgba(0,0,0,0.06);
            border: 1px solid rgba(0,0,0,0.03);
            position: relative;
            overflow: hidden;
            transform: perspective(1000px) rotateY(-5deg);
            transition: var(--ztdk-transition);
        }

        .ztdk-sync-box:hover {
            transform: perspective(1000px) rotateY(0deg) translateY(-10px);
        }

        .ztdk-sync-orbit {
            width: 200px;
            height: 200px;
            border: 2px dashed var(--ztdk-primary);
            border-radius: 50%;
            margin: 0 auto 24px;
            position: relative;
            animation: rotate 20s linear infinite;
        }

        @keyframes rotate {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }

        .ztdk-sync-node {
            position: absolute;
            width: 40px;
            height: 40px;
            background: white;
            border-radius: 10px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
        }

        .ztdk-node-1 { top: -20px; left: 80px; color: var(--ztdk-primary); }
        .ztdk-node-2 { bottom: -20px; left: 80px; color: var(--ztdk-success); }
        .ztdk-node-3 { left: -20px; top: 80px; color: var(--ztdk-warning); }
        .ztdk-node-4 { right: -20px; top: 80px; color: var(--ztdk-danger); }

        /* Technical Architecture Section */
        .ztdk-tech-section {
            padding: 96px 24px;
            background: var(--ztdk-bg-gray);
        }

        .ztdk-section-title {
            text-align: center;
            margin-bottom: 64px;
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
        }

        .ztdk-tech-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
            max-width: var(--ztdk-container-width);
            margin: 0 auto;
        }

        .ztdk-tech-card {
            background: white;
            padding: 48px 32px;
            border-radius: 24px;
            transition: var(--ztdk-transition);
            border: 1px solid transparent;
        }

        .ztdk-tech-card:hover {
            border-color: var(--ztdk-primary);
            box-shadow: 0 16px 32px rgba(66, 133, 244, 0.08);
            transform: translateY(-8px);
        }

        .ztdk-tech-badge {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(66, 133, 244, 0.1);
            color: var(--ztdk-primary);
            border-radius: 6px;
            font-size: 0.8rem;
            font-weight: 700;
            margin-bottom: 16px;
            text-transform: uppercase;
        }

        /* Synergy Matrix Section */
        .ztdk-synergy-section {
            padding: 96px 24px;
            max-width: var(--ztdk-container-width);
            margin: 0 auto;
        }

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

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

        .ztdk-synergy-content {
            flex: 1;
            min-width: 300px;
        }

        .ztdk-synergy-img-placeholder {
            flex: 1;
            min-width: 300px;
            height: 400px;
            background: linear-gradient(45deg, #f1f3f4, #ffffff);
            border-radius: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            box-shadow: inset 0 0 40px rgba(0,0,0,0.02);
        }

        .ztdk-floating-ui {
            width: 80%;
            height: 60%;
            background: white;
            border-radius: 12px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
            padding: 20px;
        }

        /* Dynamic Articles */
        .ztdk-dynamic-section {
            padding: 80px 24px;
            background: #fff;
            border-top: 1px solid #eee;
        }

        .ztdk-article-list {
            max-width: var(--ztdk-container-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 24px;
        }

        /* Footer */
        .ztdk-footer {
            background: #202124;
            color: #fff;
            padding: 80px 24px 40px;
        }

        .ztdk-footer-inner {
            max-width: var(--ztdk-container-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            padding-bottom: 64px;
        }

        .ztdk-footer-brand h2 {
            font-size: 1.5rem;
            margin-bottom: 16px;
        }

        .ztdk-footer-links h4 {
            margin-bottom: 24px;
            color: #9aa0a6;
            font-size: 0.9rem;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

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

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

        .ztdk-footer-links a {
            color: #bdc1c6;
            text-decoration: none;
            transition: var(--ztdk-transition);
        }

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

        .ztdk-footer-bottom {
            max-width: var(--ztdk-container-width);
            margin: 40px auto 0;
            text-align: center;
            color: #9aa0a6;
            font-size: 0.85rem;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .ztdk-hero { padding-top: 120px; }
            .ztdk-synergy-row, .ztdk-hero-inner { gap: 32px; }
            .ztdk-menu { display: none; } /* Simplified for demo, usually a hamburger */
            .ztdk-fluid-h1 { font-size: 2.5rem; }
        }

        .ztdk-btn {
            display: inline-block;
            padding: 16px 32px;
            background: var(--ztdk-primary);
            color: white;
            text-decoration: none;
            border-radius: 30px;
            font-weight: 600;
            transition: var(--ztdk-transition);
            box-shadow: 0 8px 16px rgba(66, 133, 244, 0.2);
            border: none;
            cursor: pointer;
        }

        .ztdk-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 24px rgba(66, 133, 244, 0.3);
            background: #1a73e8;
        }