:root {
            --tr7nn-primary: #4285F4;
            --tr7nn-red: #EA4335;
            --tr7nn-yellow: #FBBC04;
            --tr7nn-green: #34A853;
            --tr7nn-text: #202124;
            --tr7nn-text-light: #5f6368;
            --tr7nn-bg: #ffffff;
            --tr7nn-bg-alt: #f8f9fa;
            --tr7nn-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        body {
            font-family: 'Segoe UI', Roboto, Helvetica, Arial, 'PingFang SC', 'Hiragino Sans GB', sans-serif;
            color: var(--tr7nn-text);
            background-color: var(--tr7nn-bg);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: keep-all;
        }

        /* 导航栏设计 */
        .tr7nn-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            z-index: 1000;
            border-bottom: 1px solid rgba(0,0,0,0.05);
        }

        .tr7nn-nav-container {
            max-width: 1100px;
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 0 24px;
            height: 72px;
        }

        .tr7nn-logo {
            display: flex;
            align-items: center;
            min-width: 0;
        }

        .tr7nn-logo img {
            height: 32px;
            width: auto;
        }

        .tr7nn-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 8px;
            min-width: 0;
        }

        .tr7nn-menu li {
            min-width: 0;
        }

        .tr7nn-menu a {
            text-decoration: none;
            color: var(--tr7nn-text-light);
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--tr7nn-transition);
        }

        .tr7nn-menu a:hover {
            background-color: rgba(66, 133, 244, 0.08);
            color: var(--tr7nn-primary);
        }

        .tr7nn-menu a.tr7nn-active {
            color: var(--tr7nn-primary);
            background-color: rgba(66, 133, 244, 0.12);
        }

        /* Hero 区块 - 独特非对称布局 */
        .tr7nn-hero {
            padding: 160px 24px 96px;
            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-wrap: wrap;
            justify-content: center;
            text-align: center;
        }

        .tr7nn-hero-content {
            max-width: 900px;
            min-width: 0;
        }

        .tr7nn-hero-tag {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(66, 133, 244, 0.1);
            color: var(--tr7nn-primary);
            border-radius: 50px;
            font-size: 0.9rem;
            font-weight: 700;
            margin-bottom: 24px;
        }

        .tr7nn-hero h1 {
            font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
            line-height: 1.1;
            margin-bottom: 24px;
            font-weight: 800;
            letter-spacing: -1px;
            word-break: break-word;
        }

        .tr7nn-hero p {
            font-size: clamp(1.1rem, 2vw + 0.5rem, 1.4rem);
            color: var(--tr7nn-text-light);
            max-width: 700px;
            margin: 0 auto 40px;
            word-break: break-word;
        }

        /* 纯净视窗展示区 */
        .tr7nn-visual-demo {
            width: 100%;
            max-width: 1000px;
            margin: 48px auto 0;
            position: relative;
            padding: 20px;
            background: #fff;
            border-radius: 24px;
            box-shadow: 0 40px 100px rgba(0,0,0,0.1);
            min-width: 0;
        }

        .tr7nn-browser-mockup {
            background: #f1f3f4;
            border-radius: 12px;
            overflow: hidden;
            aspect-ratio: 16/9;
            display: flex;
            flex-direction: column;
        }

        .tr7nn-mock-header {
            height: 40px;
            background: #dee1e6;
            display: flex;
            align-items: center;
            padding: 0 16px;
            gap: 8px;
        }

        .tr7nn-dot { width: 12px; height: 12px; border-radius: 50%; background: #ff5f57; }
        .tr7nn-dot:nth-child(2) { background: #ffbd2e; }
        .tr7nn-dot:nth-child(3) { background: #28c940; }

        .tr7nn-mock-content {
            flex-grow: 1;
            background: white;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
        }

        .tr7nn-shield-icon {
            font-size: 80px;
            filter: drop-shadow(0 10px 20px rgba(66, 133, 244, 0.3));
        }

        /* 核心技术矩阵 */
        .tr7nn-matrix-section {
            padding: 96px 24px;
            background-color: var(--tr7nn-bg-alt);
        }

        .tr7nn-container {
            max-width: 1100px;
            margin: 0 auto;
            min-width: 0;
        }

        .tr7nn-section-title {
            text-align: center;
            margin-bottom: 64px;
        }

        .tr7nn-section-title h2 {
            font-size: clamp(2rem, 3vw + 0.5rem, 2.8rem);
            margin-bottom: 16px;
        }

        .tr7nn-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 32px;
        }

        .tr7nn-card {
            background: white;
            padding: 40px;
            border-radius: 24px;
            transition: var(--tr7nn-transition);
            border: 1px solid rgba(0,0,0,0.03);
            display: flex;
            flex-direction: column;
            gap: 16px;
            min-width: 0;
        }

        .tr7nn-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.05);
        }

        .tr7nn-card-icon {
            font-size: 32px;
            margin-bottom: 8px;
        }

        .tr7nn-card h3 {
            font-size: 1.5rem;
            color: var(--tr7nn-text);
        }

        .tr7nn-card p {
            color: var(--tr7nn-text-light);
            font-size: 1rem;
            line-height: 1.7;
        }

        .tr7nn-status-badge {
            display: inline-block;
            padding: 4px 12px;
            background: #e6f4ea;
            color: var(--tr7nn-green);
            border-radius: 4px;
            font-size: 0.8rem;
            font-weight: bold;
            align-self: flex-start;
        }

        /* 隐私沙盒详情区块 - 侧重图文并茂 */
        .tr7nn-privacy-section {
            padding: 96px 24px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
            max-width: 1100px;
            margin: 0 auto;
        }

        .tr7nn-privacy-text {
            flex: 1;
            min-width: 300px;
        }

        .tr7nn-privacy-visual {
            flex: 1;
            min-width: 300px;
            background: linear-gradient(135deg, var(--tr7nn-primary), var(--tr7nn-green));
            aspect-ratio: 1;
            border-radius: 50% 50% 30% 70% / 50% 30% 70% 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 100px;
            box-shadow: 0 30px 60px rgba(66, 133, 244, 0.3);
            animation: tr7nn-morph 10s infinite alternate ease-in-out;
        }

        @keyframes tr7nn-morph {
            0% { border-radius: 50% 50% 30% 70% / 50% 30% 70% 50%; }
            100% { border-radius: 30% 70% 50% 50% / 70% 50% 50% 30%; }
        }

        .tr7nn-privacy-text h2 {
            font-size: 2.5rem;
            margin-bottom: 24px;
        }

        .tr7nn-privacy-text p {
            font-size: 1.1rem;
            color: var(--tr7nn-text-light);
            margin-bottom: 32px;
        }

        .tr7nn-btn {
            display: inline-block;
            padding: 16px 32px;
            background-color: var(--tr7nn-primary);
            color: white;
            text-decoration: none;
            border-radius: 50px;
            font-weight: 600;
            transition: var(--tr7nn-transition);
            border: none;
            cursor: pointer;
        }

        .tr7nn-btn:hover {
            background-color: #1a73e8;
            box-shadow: 0 8px 24px rgba(66, 133, 244, 0.3);
            transform: scale(1.05);
        }

        /* 动态资讯区 */
        .tr7nn-dynamic-section {
            padding: 96px 24px;
            background-color: #fff;
        }

        .tr7nn-news-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 24px;
        }

        .tr7nn-news-item {
            padding: 24px;
            border-left: 4px solid var(--tr7nn-yellow);
            background: var(--tr7nn-bg-alt);
            border-radius: 0 16px 16px 0;
            min-width: 0;
        }

        .tr7nn-news-item h4 {
            margin-bottom: 8px;
            font-size: 1.2rem;
        }

        /* 页脚 */
        .tr7nn-footer {
            background: #202124;
            color: #fff;
            padding: 80px 24px 40px;
        }

        .tr7nn-footer-content {
            max-width: 1100px;
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
            min-width: 0;
        }

        .tr7nn-footer-brand {
            flex: 2;
            min-width: 280px;
        }

        .tr7nn-footer-brand h2 {
            font-size: 2rem;
            margin-bottom: 16px;
            color: white;
        }

        .tr7nn-footer-links {
            flex: 3;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 32px;
            min-width: 0;
        }

        .tr7nn-footer-group h5 {
            font-size: 1rem;
            margin-bottom: 20px;
            color: #9aa0a6;
        }

        .tr7nn-footer-group ul {
            list-style: none;
        }

        .tr7nn-footer-group li {
            margin-bottom: 12px;
        }

        .tr7nn-footer-group a {
            color: #bdc1c6;
            text-decoration: none;
            transition: color 0.2s;
        }

        .tr7nn-footer-group a:hover {
            color: white;
        }

        .tr7nn-copyright {
            max-width: 1100px;
            margin: 64px auto 0;
            padding-top: 32px;
            border-top: 1px solid #3c4043;
            text-align: center;
            color: #9aa0a6;
            font-size: 0.9rem;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .tr7nn-nav-container {
                height: auto;
                padding: 16px;
            }
            .tr7nn-menu {
                width: 100%;
                justify-content: center;
                margin-top: 16px;
            }
            .tr7nn-hero {
                padding-top: 140px;
            }
            .tr7nn-privacy-visual {
                order: -1;
            }
            .tr7nn-grid {
                grid-template-columns: 1fr;
            }
        }