:root {
            --eztx-primary: #0052cc;
            --eztx-accent: #ff4a4a;
            --eztx-text: #1e293b;
            --eztx-text-light: #64748b;
            --eztx-bg: #f8fafc;
            --eztx-white: #ffffff;
            --eztx-radius: 16px;
            --eztx-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
            --eztx-container-max: 1300px;
        }

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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
            background-color: var(--eztx-bg);
            color: var(--eztx-text);
            line-height: 1.7;
            word-break: break-word;
            overflow-x: hidden;
        }

        /* 布局容器 */
        .eztx-container {
            max-width: var(--eztx-container-max);
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* 导航栏 */
        .eztx-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(12px);
            z-index: 1000;
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
        }

        .eztx-nav-container {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            min-width: 0;
        }

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

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

        .eztx-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 8px;
            min-width: 0;
        }

        .eztx-nav-item {
            min-width: 0;
        }

        .eztx-nav-link {
            text-decoration: none;
            color: var(--eztx-text-light);
            font-weight: 500;
            padding: 8px 16px;
            border-radius: 8px;
            transition: all 0.3s ease;
            font-size: 15px;
            white-space: nowrap;
        }

        .eztx-nav-link:hover {
            color: var(--eztx-primary);
            background: rgba(0, 82, 204, 0.05);
        }

        .eztx-nav-link.active {
            color: var(--eztx-primary);
            background: rgba(0, 82, 204, 0.1);
        }

        /* Hero 区块 - 独特非对称布局 */
        .eztx-hero {
            padding-top: 160px;
            padding-bottom: 96px;
            background: linear-gradient(135deg, #ffffff 0%, #eef2ff 100%);
            position: relative;
            overflow: hidden;
        }

        .eztx-hero::after {
            content: '';
            position: absolute;
            top: -10%;
            right: -5%;
            width: 40%;
            height: 80%;
            background: radial-gradient(circle, rgba(0, 82, 204, 0.05) 0%, transparent 70%);
            z-index: 0;
        }

        .eztx-hero-grid {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 48px;
            position: relative;
            z-index: 1;
        }

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

        .eztx-hero-title {
            font-size: clamp(2.2rem, 4vw + 1rem, 3.5rem);
            line-height: 1.2;
            font-weight: 800;
            margin-bottom: 24px;
            color: #0f172a;
            word-break: keep-all;
        }

        .eztx-hero-subtitle {
            font-size: clamp(1.1rem, 1vw + 0.5rem, 1.35rem);
            color: var(--eztx-text-light);
            margin-bottom: 40px;
            max-width: 600px;
        }

        .eztx-hero-image {
            flex: 1.2;
            min-width: 320px;
            filter: drop-shadow(0 20px 50px rgba(0,0,0,0.15));
            transition: transform 0.5s ease;
        }

        .eztx-hero-image:hover {
            transform: translateY(-10px);
        }

        .eztx-hero-image img {
            width: 100%;
            height: auto;
            border-radius: var(--eztx-radius);
            display: block;
        }

        .eztx-download-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
        }

        .eztx-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 16px 36px;
            border-radius: 50px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            cursor: pointer;
            font-size: 16px;
        }

        .eztx-btn-primary {
            background: var(--eztx-primary);
            color: white;
            box-shadow: 0 4px 15px rgba(0, 82, 204, 0.3);
        }

        .eztx-btn-primary:hover {
            background: #0044aa;
            transform: scale(1.05);
            box-shadow: 0 8px 25px rgba(0, 82, 204, 0.4);
        }

        /* 协作引擎能力区块 */
        .eztx-section {
            padding: 96px 0;
        }

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

        .eztx-section-title {
            font-size: clamp(1.8rem, 3vw, 2.5rem);
            margin-bottom: 16px;
        }

        .eztx-engine-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 32px;
        }

        .eztx-engine-card {
            background: var(--eztx-white);
            padding: 40px;
            border-radius: var(--eztx-radius);
            box-shadow: var(--eztx-shadow);
            transition: all 0.3s ease;
            border: 1px solid rgba(0, 0, 0, 0.03);
            min-width: 0;
        }

        .eztx-engine-card:hover {
            transform: translateY(-8px);
            border-color: var(--eztx-primary);
        }

        .eztx-engine-id {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(0, 82, 204, 0.08);
            color: var(--eztx-primary);
            font-size: 12px;
            border-radius: 4px;
            margin-bottom: 16px;
            font-family: monospace;
        }

        .eztx-engine-name {
            font-size: 1.5rem;
            margin-bottom: 16px;
            color: var(--eztx-text);
        }

        .eztx-engine-desc {
            color: var(--eztx-text-light);
            margin-bottom: 24px;
        }

        .eztx-engine-metrics {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            padding-top: 20px;
            border-top: 1px dashed #e2e8f0;
        }

        .eztx-metric-item {
            flex: 1;
            min-width: 80px;
        }

        .eztx-metric-label {
            display: block;
            font-size: 12px;
            color: var(--eztx-text-light);
        }

        .eztx-metric-value {
            display: block;
            font-weight: 700;
            color: var(--eztx-primary);
        }

        /* 移动端下载区 */
        .eztx-mobile-section {
            background: #0f172a;
            color: white;
            border-radius: 40px;
            margin: 48px auto;
            padding: 64px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
        }

        .eztx-mobile-image {
            flex: 1;
            min-width: 300px;
        }

        .eztx-mobile-image img {
            width: 100%;
            height: auto;
            border-radius: 20px;
            box-shadow: 0 30px 60px rgba(0,0,0,0.5);
        }

        .eztx-mobile-info {
            flex: 1.2;
            min-width: 300px;
        }

        .eztx-mobile-info h2 {
            font-size: 2.5rem;
            margin-bottom: 24px;
        }

        .eztx-qr-container {
            display: flex;
            align-items: center;
            gap: 24px;
            background: rgba(255, 255, 255, 0.05);
            padding: 24px;
            border-radius: 20px;
            margin-top: 32px;
        }

        .eztx-qr-placeholder {
            width: 120px;
            height: 120px;
            background: white;
            padding: 8px;
            border-radius: 8px;
        }

        .eztx-qr-placeholder img {
            width: 100%;
            height: auto;
        }

        /* 安全防护区 */
        .eztx-secure-section {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
            margin-top: 64px;
        }

        .eztx-secure-content {
            flex: 1;
            min-width: 320px;
        }

        .eztx-secure-img {
            flex: 1;
            min-width: 320px;
        }

        .eztx-secure-img img {
            width: 100%;
            height: auto;
            border-radius: var(--eztx-radius);
            box-shadow: var(--eztx-shadow);
        }

        .eztx-feature-list {
            list-style: none;
            margin-top: 24px;
        }

        .eztx-feature-item {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 12px;
            font-weight: 500;
        }

        .eztx-feature-item::before {
            content: "✓";
            color: #10b981;
            font-weight: bold;
        }

        /* 页脚 */
        .eztx-footer {
            background: #f1f5f9;
            padding: 80px 0 40px;
            border-top: 1px solid #e2e8f0;
        }

        .eztx-footer-grid {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
            margin-bottom: 48px;
        }

        .eztx-footer-brand {
            flex: 1.5;
            min-width: 240px;
        }

        .eztx-brand-name {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--eztx-primary);
            margin-bottom: 16px;
        }

        .eztx-footer-links {
            flex: 1;
            min-width: 150px;
        }

        .eztx-footer-title {
            font-weight: 700;
            margin-bottom: 20px;
            color: var(--eztx-text);
        }

        .eztx-footer-menu {
            list-style: none;
        }

        .eztx-footer-menu li {
            margin-bottom: 10px;
        }

        .eztx-footer-menu a {
            text-decoration: none;
            color: var(--eztx-text-light);
            transition: color 0.3s;
        }

        .eztx-footer-menu a:hover {
            color: var(--eztx-primary);
        }

        .eztx-copyright {
            text-align: center;
            padding-top: 40px;
            border-top: 1px solid #cbd5e1;
            color: var(--eztx-text-light);
            font-size: 14px;
        }

        /* 响应式断点 */
        @media (max-width: 1024px) {
            .eztx-nav-menu {
                display: none; /* 简化演示，实际应有汉堡菜单 */
            }
            .eztx-hero {
                padding-top: 120px;
            }
        }

        @media (max-width: 768px) {
            .eztx-hero-grid, .eztx-mobile-section, .eztx-secure-section {
                flex-direction: column;
                text-align: center;
            }
            .eztx-hero-content, .eztx-hero-image, .eztx-mobile-info, .eztx-mobile-image, .eztx-secure-content, .eztx-secure-img {
                width: 100%;
                min-width: 0;
            }
            .eztx-download-actions {
                justify-content: center;
            }
            .eztx-engine-grid {
                grid-template-columns: 1fr;
            }
            .eztx-mobile-section {
                padding: 32px 20px;
                border-radius: 20px;
            }
            .eztx-qr-container {
                flex-direction: column;
            }
        }