:root {
            --tr7nn-primary: #4285F4;
            --tr7nn-red: #EA4335;
            --tr7nn-yellow: #FBBC04;
            --tr7nn-green: #34A853;
            --tr7nn-text-dark: #202124;
            --tr7nn-text-light: #5f6368;
            --tr7nn-bg-gray: #f8f9fa;
            --tr7nn-white: #ffffff;
            --tr7nn-shadow: 0 4px 20px rgba(0,0,0,0.08);
            --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 Neue", Arial, sans-serif;
            color: var(--tr7nn-text-dark);
            line-height: 1.6;
            background-color: var(--tr7nn-white);
            overflow-x: hidden;
            word-break: keep-all;
            overflow-wrap: break-word;
        }

        /* 导航栏设计 */
        .tr7nn-navbar {
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            padding: 0 24px;
        }

        .tr7nn-nav-container {
            max-width: 1400px;
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            height: 72px;
        }

        .tr7nn-logo {
            flex: 0 0 auto;
            min-width: 0;
        }

        .tr7nn-logo img {
            height: 40px;
            display: block;
        }

        .tr7nn-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 16px;
            min-width: 0;
        }

        .tr7nn-menu li a {
            text-decoration: none;
            color: var(--tr7nn-text-light);
            font-weight: 500;
            font-size: 14px;
            padding: 8px 12px;
            border-radius: 4px;
            transition: var(--tr7nn-transition);
        }

        .tr7nn-menu li a:hover {
            color: var(--tr7nn-primary);
            background: rgba(66, 133, 244, 0.05);
        }

        .tr7nn-menu li a.tr7nn-active {
            color: var(--tr7nn-primary);
            position: relative;
        }

        .tr7nn-menu li a.tr7nn-active::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 12px;
            right: 12px;
            height: 3px;
            background: var(--tr7nn-primary);
            border-radius: 2px;
        }

        /* Hero 区：全屏卡片式布局 */
        .tr7nn-hero {
            padding-top: 120px;
            padding-bottom: 64px;
            background: radial-gradient(circle at top right, rgba(66, 133, 244, 0.05), transparent),
                        radial-gradient(circle at bottom left, rgba(52, 168, 83, 0.05), transparent);
        }

        .tr7nn-container-large {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 32px;
        }

        .tr7nn-hero-card {
            display: flex;
            flex-wrap: wrap;
            background: var(--tr7nn-white);
            border-radius: 32px;
            overflow: hidden;
            box-shadow: 0 20px 60px rgba(0,0,0,0.1);
            min-width: 0;
        }

        .tr7nn-hero-content {
            flex: 1 1 500px;
            padding: 64px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            min-width: 0;
        }

        .tr7nn-hero-visual {
            flex: 1 1 500px;
            position: relative;
            background: var(--tr7nn-bg-gray);
            min-width: 0;
            min-height: 400px;
        }

        .tr7nn-hero-visual img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .tr7nn-hero-title {
            font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
            font-weight: 800;
            line-height: 1.2;
            color: var(--tr7nn-text-dark);
            margin-bottom: 24px;
        }

        .tr7nn-hero-subtitle {
            font-size: clamp(1rem, 1.2vw + 0.5rem, 1.25rem);
            color: var(--tr7nn-text-light);
            margin-bottom: 40px;
            line-height: 1.8;
        }

        .tr7nn-cta-group {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            min-width: 0;
        }

        .tr7nn-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 16px 32px;
            border-radius: 50px;
            font-weight: 600;
            text-decoration: none;
            font-size: 16px;
            transition: var(--tr7nn-transition);
            cursor: pointer;
            border: none;
        }

        .tr7nn-btn-primary {
            background: var(--tr7nn-primary);
            color: var(--tr7nn-white);
            box-shadow: 0 4px 14px rgba(66, 133, 244, 0.4);
        }

        .tr7nn-btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(66, 133, 244, 0.6);
        }

        /* 矩阵安全区块 */
        .tr7nn-section-security {
            padding: 96px 0;
            background-color: var(--tr7nn-white);
        }

        .tr7nn-section-header {
            text-align: center;
            max-width: 800px;
            margin: 0 auto 64px;
            padding: 0 24px;
        }

        .tr7nn-tag {
            display: inline-block;
            padding: 4px 16px;
            background: rgba(52, 168, 83, 0.1);
            color: var(--tr7nn-green);
            border-radius: 20px;
            font-size: 14px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .tr7nn-security-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
        }

        .tr7nn-security-card {
            padding: 40px;
            border-radius: 24px;
            background: var(--tr7nn-bg-gray);
            border: 1px solid transparent;
            transition: var(--tr7nn-transition);
        }

        .tr7nn-security-card:hover {
            background: var(--tr7nn-white);
            border-color: var(--tr7nn-primary);
            transform: translateY(-8px);
            box-shadow: var(--tr7nn-shadow);
        }

        .tr7nn-security-icon {
            font-size: 32px;
            margin-bottom: 24px;
            width: 64px;
            height: 64px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--tr7nn-white);
            border-radius: 16px;
            box-shadow: 0 4px 10px rgba(0,0,0,0.05);
        }

        .tr7nn-security-card h3 {
            font-size: 1.5rem;
            margin-bottom: 16px;
            color: var(--tr7nn-text-dark);
        }

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

        /* 跨平台展示 */
        .tr7nn-platform-split {
            padding: 96px 0;
            background: #000;
            color: var(--tr7nn-white);
            border-radius: 48px;
            margin: 48px 32px;
            overflow: hidden;
        }

        .tr7nn-flex-row {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
        }

        .tr7nn-flex-col {
            flex: 1 1 450px;
            min-width: 0;
        }

        .tr7nn-platform-img {
            border-radius: 24px;
            width: 100%;
            height: auto;
            box-shadow: 0 20px 40px rgba(0,0,0,0.4);
        }

        .tr7nn-platform-text h2 {
            font-size: clamp(1.8rem, 3vw, 2.5rem);
            margin-bottom: 24px;
        }

        /* 移动端预览 */
        .tr7nn-mobile-section {
            padding: 96px 0;
        }

        .tr7nn-mobile-box {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            align-items: center;
            flex-direction: row-reverse;
        }

        .tr7nn-mobile-preview {
            flex: 1 1 400px;
            min-width: 0;
            position: relative;
        }

        .tr7nn-mobile-preview img {
            width: 100%;
            border-radius: 40px;
            box-shadow: var(--tr7nn-shadow);
        }

        /* 页脚 */
        .tr7nn-footer {
            background: var(--tr7nn-bg-gray);
            padding: 80px 0 40px;
            margin-top: 96px;
        }

        .tr7nn-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 64px;
        }

        .tr7nn-footer-brand h2 {
            font-size: 24px;
            margin-bottom: 16px;
            color: var(--tr7nn-text-dark);
        }

        .tr7nn-footer-links h4 {
            margin-bottom: 24px;
            font-size: 16px;
            color: var(--tr7nn-text-dark);
        }

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

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

        .tr7nn-footer-links a {
            text-decoration: none;
            color: var(--tr7nn-text-light);
            font-size: 14px;
            transition: var(--tr7nn-transition);
        }

        .tr7nn-footer-links a:hover {
            color: var(--tr7nn-primary);
        }

        .tr7nn-footer-bottom {
            padding-top: 32px;
            border-top: 1px solid rgba(0,0,0,0.05);
            text-align: center;
            font-size: 14px;
            color: var(--tr7nn-text-light);
        }

        /* 响应式适配 */
        @media (max-width: 992px) {
            .tr7nn-hero-card {
                flex-direction: column;
            }
            .tr7nn-hero-content {
                padding: 40px;
            }
        }

        @media (max-width: 768px) {
            .tr7nn-nav-container {
                height: auto;
                padding: 16px;
            }
            .tr7nn-menu {
                width: 100%;
                justify-content: center;
                margin-top: 16px;
                gap: 8px;
            }
            .tr7nn-hero {
                padding-top: 160px;
            }
            .tr7nn-container-large {
                padding: 0 16px;
            }
            .tr7nn-platform-split {
                margin: 24px 16px;
                border-radius: 24px;
                padding: 48px 24px;
            }
        }