:root {
            --tr7nn-blue: #4285F4;
            --tr7nn-red: #EA4335;
            --tr7nn-yellow: #FBBC04;
            --tr7nn-green: #34A853;
            --tr7nn-text: #202124;
            --tr7nn-bg: #FFFFFF;
            --tr7nn-gray: #F8F9FA;
            --tr7nn-transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
        }

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

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

        .tr7nn-container {
            max-width: 1300px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* 导航栏设计 */
        .tr7nn-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            transition: var(--tr7nn-transition);
        }

        .tr7nn-nav-wrapper {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 16px 0;
            min-width: 0;
        }

        .tr7nn-logo {
            flex-shrink: 0;
            margin-right: 32px;
        }

        .tr7nn-logo img {
            height: 32px;
            display: block;
        }

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

        .tr7nn-nav-item {
            min-width: 0;
        }

        .tr7nn-nav-link {
            text-decoration: none;
            color: #5f6368;
            font-size: 15px;
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 8px;
            transition: var(--tr7nn-transition);
            word-break: break-word;
        }

        .tr7nn-nav-link:hover {
            background: var(--tr7nn-gray);
            color: var(--tr7nn-blue);
        }

        .tr7nn-nav-link.active {
            color: var(--tr7nn-blue);
            background: rgba(66, 133, 244, 0.1);
        }

        /* Hero 区：全屏创意布局 */
        .tr7nn-hero {
            padding: 160px 0 80px;
            position: relative;
            overflow: hidden;
        }

        .tr7nn-hero-card {
            display: flex;
            flex-wrap: wrap;
            background: var(--tr7nn-gray);
            border-radius: 32px;
            overflow: hidden;
            box-shadow: 0 20px 40px rgba(0,0,0,0.05);
            min-width: 0;
        }

        .tr7nn-hero-content {
            flex: 1;
            min-width: 320px;
            padding: 64px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .tr7nn-hero-title {
            font-size: clamp(2rem, 4vw + 0.5rem, 3.5rem);
            line-height: 1.2;
            margin-bottom: 24px;
            font-weight: 700;
            color: #1a1a1a;
            word-break: break-word;
        }

        .tr7nn-hero-subtitle {
            font-size: clamp(1rem, 1.2vw + 0.2rem, 1.25rem);
            color: #5f6368;
            margin-bottom: 40px;
            max-width: 600px;
            word-break: break-word;
        }

        .tr7nn-hero-image {
            flex: 1.2;
            min-width: 320px;
            position: relative;
            min-height: 450px;
        }

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

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

        .tr7nn-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(66, 133, 244, 0.3);
            filter: brightness(1.1);
        }

        /* 核心特性区：极速体验 */
        .tr7nn-section {
            padding: 96px 0;
        }

        .tr7nn-split {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
            min-width: 0;
        }

        .tr7nn-split-text {
            flex: 1;
            min-width: 300px;
            word-break: break-word;
        }

        .tr7nn-split-visual {
            flex: 1.2;
            min-width: 300px;
        }

        .tr7nn-split-visual img {
            width: 100%;
            border-radius: 24px;
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }

        .tr7nn-tag {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(52, 168, 83, 0.1);
            color: var(--tr7nn-green);
            border-radius: 4px;
            font-size: 14px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        /* 安全矩阵区：Grid 布局 */
        .tr7nn-security-bg {
            background-color: #202124;
            color: white;
            border-radius: 48px;
            padding: 80px 48px;
        }

        .tr7nn-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 32px;
            margin-top: 48px;
        }

        .tr7nn-card {
            background: rgba(255,255,255,0.05);
            padding: 32px;
            border-radius: 24px;
            border: 1px solid rgba(255,255,255,0.1);
            transition: var(--tr7nn-transition);
            min-width: 0;
        }

        .tr7nn-card:hover {
            background: rgba(255,255,255,0.1);
            transform: translateY(-8px);
        }

        .tr7nn-card-icon {
            font-size: 32px;
            margin-bottom: 24px;
            display: block;
        }

        .tr7nn-card-title {
            font-size: 20px;
            margin-bottom: 16px;
            color: var(--tr7nn-yellow);
        }

        .tr7nn-card-desc {
            font-size: 15px;
            color: #bdc1c6;
            line-height: 1.7;
            word-break: break-word;
        }

        /* 资讯/动态区 */
        .tr7nn-news-section {
            padding: 96px 0;
            background: #fff;
        }

        .tr7nn-section-title {
            text-align: center;
            font-size: clamp(1.8rem, 3vw, 2.5rem);
            margin-bottom: 48px;
        }

        /* 页脚 */
        .tr7nn-footer {
            background: var(--tr7nn-gray);
            padding: 80px 0 40px;
            margin-top: 64px;
        }

        .tr7nn-footer-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            justify-content: space-between;
            margin-bottom: 64px;
        }

        .tr7nn-footer-brand {
            flex: 1.5;
            min-width: 200px;
        }

        .tr7nn-footer-brand-name {
            font-size: 24px;
            font-weight: 700;
            color: var(--tr7nn-blue);
            margin-bottom: 16px;
        }

        .tr7nn-footer-links {
            flex: 1;
            min-width: 150px;
        }

        .tr7nn-footer-links h4 {
            margin-bottom: 24px;
            font-size: 16px;
        }

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

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

        .tr7nn-footer-links a {
            text-decoration: none;
            color: #5f6368;
            font-size: 14px;
            transition: var(--tr7nn-transition);
        }

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

        .tr7nn-footer-bottom {
            padding-top: 32px;
            border-top: 1px solid #dadce0;
            text-align: center;
            font-size: 14px;
            color: #70757a;
        }

        /* 响应式适配 */
        @media (max-width: 768px) {
            .tr7nn-hero-content {
                padding: 40px 24px;
            }
            .tr7nn-nav-menu {
                display: none; /* 简化演示，实际应有汉堡菜单 */
            }
            .tr7nn-split {
                flex-direction: column;
            }
            .tr7nn-hero-image {
                min-height: 300px;
            }
            .tr7nn-security-bg {
                padding: 48px 24px;
                border-radius: 24px;
            }
        }