:root {
            --tr7nn-primary: #4285F4;
            --tr7nn-secondary: #EA4335;
            --tr7nn-tertiary: #FBBC04;
            --tr7nn-quaternary: #34A853;
            --tr7nn-text-dark: #202124;
            --tr7nn-text-light: #5f6368;
            --tr7nn-bg-light: #ffffff;
            --tr7nn-bg-soft: #f8f9fa;
            --tr7nn-spacing-unit: 8px;
            --tr7nn-border-radius: 16px;
            --tr7nn-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

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

        .tr7nn-container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 calc(var(--tr7nn-spacing-unit) * 3);
            width: 100%;
        }

        /* 导航系统 */
        .tr7nn-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
            padding: calc(var(--tr7nn-spacing-unit) * 2) 0;
        }

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

        .tr7nn-logo {
            flex-shrink: 0;
            margin-right: calc(var(--tr7nn-spacing-unit) * 4);
        }

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

        .tr7nn-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: calc(var(--tr7nn-spacing-unit) * 3);
            min-width: 0;
        }

        .tr7nn-nav-link {
            text-decoration: none;
            color: var(--tr7nn-text-light);
            font-weight: 500;
            font-size: 15px;
            padding: calc(var(--tr7nn-spacing-unit) * 1) calc(var(--tr7nn-spacing-unit) * 2);
            border-radius: 20px;
            transition: var(--tr7nn-transition);
            word-break: break-word;
        }

        .tr7nn-nav-link:hover {
            background: var(--tr7nn-bg-soft);
            color: var(--tr7nn-primary);
        }

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

        /* Hero 区域 - 独特对角线卡片布局 */
        .tr7nn-hero-section {
            padding: calc(var(--tr7nn-spacing-unit) * 12) 0;
            background: radial-gradient(circle at top right, rgba(66, 133, 244, 0.05), transparent);
            position: relative;
            overflow: hidden;
        }

        .tr7nn-hero-grid {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: calc(var(--tr7nn-spacing-unit) * 6);
        }

        .tr7nn-hero-content {
            flex: 1;
            min-width: 320px;
            word-break: break-word;
        }

        .tr7nn-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
            line-height: 1.1;
            font-weight: 800;
            margin-bottom: calc(var(--tr7nn-spacing-unit) * 4);
            letter-spacing: -0.02em;
        }

        .tr7nn-hero-subtitle {
            font-size: clamp(1.1rem, 2vw + 0.5rem, 1.4rem);
            color: var(--tr7nn-text-light);
            max-width: 600px;
            margin-bottom: calc(var(--tr7nn-spacing-unit) * 6);
            line-height: 1.6;
        }

        .tr7nn-hero-visual {
            flex: 1;
            min-width: 320px;
            position: relative;
            display: flex;
            justify-content: center;
        }

        /* 纯CSS装饰图形，代替缺少图片的情况 */
        .tr7nn-visual-box {
            width: 100%;
            max-width: 500px;
            aspect-ratio: 1/1;
            background: linear-gradient(135deg, var(--tr7nn-primary), #1a73e8);
            border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
            box-shadow: 0 40px 80px rgba(66, 133, 244, 0.3);
            display: flex;
            align-items: center;
            justify-content: center;
            animation: tr7nn-morph 10s ease-in-out infinite;
        }

        @keyframes tr7nn-morph {
            0% { border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%; }
            50% { border-radius: 50% 50% 33% 67% / 55% 27% 73% 45%; }
            100% { border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%; }
        }

        .tr7nn-visual-inner {
            color: white;
            text-align: center;
            padding: 40px;
        }

        .tr7nn-visual-text {
            font-size: 80px;
            font-weight: 900;
            opacity: 0.2;
            line-height: 1;
        }

        /* 下载控制台 */
        .tr7nn-download-hub {
            padding: calc(var(--tr7nn-spacing-unit) * 8) 0;
            background: var(--tr7nn-bg-soft);
            border-radius: calc(var(--tr7nn-spacing-unit) * 4);
            margin-bottom: calc(var(--tr7nn-spacing-unit) * 12);
        }

        .tr7nn-download-card {
            background: white;
            border-radius: var(--tr7nn-border-radius);
            padding: calc(var(--tr7nn-spacing-unit) * 6);
            box-shadow: 0 10px 30px rgba(0,0,0,0.03);
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: calc(var(--tr7nn-spacing-unit) * 4);
            border: 1px solid rgba(0,0,0,0.05);
        }

        .tr7nn-download-info h3 {
            font-size: 28px;
            margin-bottom: 8px;
        }

        .tr7nn-btn-primary {
            background: var(--tr7nn-primary);
            color: white;
            padding: 18px 48px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 700;
            font-size: 18px;
            transition: var(--tr7nn-transition);
            box-shadow: 0 4px 14px rgba(66, 133, 244, 0.39);
            border: none;
            cursor: pointer;
            display: inline-block;
        }

        .tr7nn-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(66, 133, 244, 0.45);
            background: #1a73e8;
        }

        /* 安全矩阵区块 - Grid布局 */
        .tr7nn-matrix-section {
            padding: calc(var(--tr7nn-spacing-unit) * 12) 0;
        }

        .tr7nn-section-title {
            font-size: clamp(2rem, 3vw, 3rem);
            text-align: center;
            margin-bottom: calc(var(--tr7nn-spacing-unit) * 8);
        }

        .tr7nn-matrix-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: calc(var(--tr7nn-spacing-unit) * 4);
        }

        .tr7nn-matrix-card {
            padding: calc(var(--tr7nn-spacing-unit) * 5);
            border-radius: var(--tr7nn-border-radius);
            background: white;
            border: 1px solid #eee;
            transition: var(--tr7nn-transition);
            position: relative;
            overflow: hidden;
        }

        .tr7nn-matrix-card:hover {
            border-color: var(--tr7nn-primary);
            transform: translateY(-8px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.05);
        }

        .tr7nn-matrix-tag {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 4px;
            font-size: 12px;
            font-weight: 700;
            text-transform: uppercase;
            margin-bottom: 16px;
            background: #e8f0fe;
            color: var(--tr7nn-primary);
        }

        .tr7nn-matrix-card h4 {
            font-size: 20px;
            margin-bottom: 12px;
            color: var(--tr7nn-text-dark);
        }

        .tr7nn-matrix-card p {
            color: var(--tr7nn-text-light);
            font-size: 15px;
            line-height: 1.7;
        }

        /* 动态内容区块 */
        .tr7nn-news-section {
            padding: calc(var(--tr7nn-spacing-unit) * 10) 0;
            background: #fff;
        }

        .tr7nn-news-grid {
            display: flex;
            flex-wrap: wrap;
            gap: calc(var(--tr7nn-spacing-unit) * 4);
        }

        .tr7nn-news-item {
            flex: 1;
            min-width: 300px;
            padding: 24px;
            border-left: 4px solid var(--tr7nn-quaternary);
            background: var(--tr7nn-bg-soft);
        }

        /* 页脚 */
        .tr7nn-footer {
            background: var(--tr7nn-text-dark);
            color: #fff;
            padding: calc(var(--tr7nn-spacing-unit) * 10) 0 calc(var(--tr7nn-spacing-unit) * 5);
            margin-top: calc(var(--tr7nn-spacing-unit) * 12);
        }

        .tr7nn-footer-grid {
            display: flex;
            flex-wrap: wrap;
            gap: calc(var(--tr7nn-spacing-unit) * 8);
            justify-content: space-between;
        }

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

        .tr7nn-footer-brand h2 {
            font-size: 24px;
            margin-bottom: 24px;
            color: white;
        }

        .tr7nn-footer-links {
            flex: 3;
            display: flex;
            flex-wrap: wrap;
            gap: calc(var(--tr7nn-spacing-unit) * 6);
            min-width: 300px;
        }

        .tr7nn-footer-col {
            flex: 1;
            min-width: 140px;
        }

        .tr7nn-footer-col h5 {
            margin-bottom: 20px;
            font-size: 16px;
            color: rgba(255,255,255,0.6);
        }

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

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

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

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

        .tr7nn-copyright {
            margin-top: calc(var(--tr7nn-spacing-unit) * 8);
            padding-top: calc(var(--tr7nn-spacing-unit) * 4);
            border-top: 1px solid rgba(255,255,255,0.1);
            text-align: center;
            font-size: 13px;
            color: rgba(255,255,255,0.4);
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .tr7nn-nav-inner {
                flex-direction: column;
                gap: 16px;
            }
            .tr7nn-nav-menu {
                justify-content: center;
                gap: 8px;
            }
            .tr7nn-hero-section {
                padding: calc(var(--tr7nn-spacing-unit) * 6) 0;
                text-align: center;
            }
            .tr7nn-hero-content {
                order: 2;
            }
            .tr7nn-hero-visual {
                order: 1;
                margin-bottom: 40px;
            }
            .tr7nn-hero-subtitle {
                margin: 0 auto calc(var(--tr7nn-spacing-unit) * 6);
            }
            .tr7nn-download-card {
                justify-content: center;
                text-align: center;
            }
        }