/* CSS 变量定义 - 谷歌官方配色 */
        :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-border: #dadce0;
            --tr7nn-shadow: 0 4px 20px rgba(0,0,0,0.08);
            --tr7nn-radius: 16px;
            --tr7nn-max-width: 1400px;
        }

        /* 基础重置 */
        * {
            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: break-word;
        }

        /* 导航栏 */
        .tr7nn-header {
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--tr7nn-border);
            padding: 12px 0;
        }

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

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

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

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

        .tr7nn-nav-item a {
            text-decoration: none;
            color: var(--tr7nn-text-light);
            font-size: 15px;
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 8px;
            transition: all 0.3s ease;
        }

        .tr7nn-nav-item a:hover {
            background: var(--tr7nn-bg-alt);
            color: var(--tr7nn-primary);
        }

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

        /* Hero 区 - 独特对角线布局 */
        .tr7nn-hero {
            padding: 160px 0 80px;
            background: linear-gradient(135deg, #f1f3f4 0%, #ffffff 100%);
            position: relative;
            overflow: hidden;
        }

        .tr7nn-hero-container {
            max-width: var(--tr7nn-max-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 48px;
        }

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

        .tr7nn-hero-title {
            font-size: clamp(2.5rem, 5vw, 4rem);
            line-height: 1.1;
            font-weight: 700;
            margin-bottom: 24px;
            color: var(--tr7nn-text);
            word-break: keep-all;
        }

        .tr7nn-hero-subtitle {
            font-size: clamp(1.1rem, 2vw, 1.3rem);
            color: var(--tr7nn-text-light);
            margin-bottom: 40px;
            max-width: 600px;
        }

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

        .tr7nn-hero-image img {
            width: 100%;
            height: auto;
            border-radius: var(--tr7nn-radius);
            box-shadow: var(--tr7nn-shadow);
            transform: perspective(1000px) rotateY(-10deg) rotateX(5deg);
            transition: transform 0.5s ease;
        }

        .tr7nn-hero-image:hover img {
            transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
        }

        /* 核心插件展示区 */
        .tr7nn-section {
            padding: 96px 0;
        }

        .tr7nn-container {
            max-width: var(--tr7nn-max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        .tr7nn-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
            gap: 32px;
        }

        .tr7nn-card {
            background: var(--tr7nn-bg);
            border: 1px solid var(--tr7nn-border);
            border-radius: var(--tr7nn-radius);
            overflow: hidden;
            transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
            display: flex;
            flex-direction: column;
        }

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

        .tr7nn-card-img {
            width: 100%;
            height: 240px;
            object-fit: cover;
        }

        .tr7nn-card-body {
            padding: 32px;
            flex-grow: 1;
        }

        .tr7nn-card-tag {
            display: inline-block;
            padding: 4px 12px;
            background: var(--tr7nn-bg-alt);
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
            color: var(--tr7nn-primary);
            margin-bottom: 16px;
        }

        .tr7nn-card-title {
            font-size: 24px;
            margin-bottom: 12px;
            font-weight: 700;
        }

        .tr7nn-card-text {
            color: var(--tr7nn-text-light);
            font-size: 16px;
            line-height: 1.7;
        }

        /* 安全矩阵区块 - 独特布局 */
        .tr7nn-security-matrix {
            background: var(--tr7nn-text);
            color: white;
            border-radius: 32px;
            padding: 64px;
            margin: 48px 24px;
        }

        .tr7nn-matrix-header {
            margin-bottom: 48px;
            text-align: center;
        }

        .tr7nn-matrix-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }

        .tr7nn-matrix-item {
            background: rgba(255,255,255,0.05);
            padding: 32px;
            border-radius: var(--tr7nn-radius);
            border: 1px solid rgba(255,255,255,0.1);
            transition: background 0.3s ease;
        }

        .tr7nn-matrix-item:hover {
            background: rgba(255,255,255,0.1);
        }

        .tr7nn-matrix-protocol {
            color: var(--tr7nn-yellow);
            font-family: monospace;
            font-size: 14px;
            margin-bottom: 8px;
            display: block;
        }

        .tr7nn-matrix-func {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .tr7nn-matrix-status {
            font-size: 14px;
            color: var(--tr7nn-green);
        }

        /* 动态内容区块 */
        .tr7nn-news-section {
            background: var(--tr7nn-bg-alt);
        }

        .tr7nn-section-header {
            margin-bottom: 48px;
            max-width: 800px;
        }

        .tr7nn-section-title {
            font-size: clamp(1.8rem, 3vw, 2.5rem);
            margin-bottom: 16px;
            font-weight: 700;
        }

        /* 按钮样式 */
        .tr7nn-btn {
            display: inline-block;
            padding: 14px 32px;
            border-radius: 30px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s ease;
            cursor: pointer;
            border: none;
            font-size: 16px;
        }

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

        .tr7nn-btn-primary:hover {
            background: #3367d6;
            transform: scale(1.05);
        }

        .tr7nn-btn-outline {
            background: transparent;
            border: 2px solid var(--tr7nn-border);
            color: var(--tr7nn-text);
            margin-left: 16px;
        }

        .tr7nn-btn-outline:hover {
            background: var(--tr7nn-bg-alt);
            border-color: var(--tr7nn-text);
        }

        /* 页脚 */
        .tr7nn-footer {
            background: var(--tr7nn-bg);
            border-top: 1px solid var(--tr7nn-border);
            padding: 64px 0 32px;
        }

        .tr7nn-footer-top {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            margin-bottom: 48px;
        }

        .tr7nn-footer-brand {
            flex: 1;
            min-width: 250px;
        }

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

        .tr7nn-footer-links {
            flex: 2;
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            justify-content: flex-end;
        }

        .tr7nn-footer-column h4 {
            margin-bottom: 20px;
            font-size: 16px;
            color: var(--tr7nn-text);
        }

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

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

        .tr7nn-footer-column a {
            text-decoration: none;
            color: var(--tr7nn-text-light);
            font-size: 14px;
            transition: color 0.2s;
        }

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

        .tr7nn-footer-bottom {
            border-top: 1px solid var(--tr7nn-border);
            padding-top: 32px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            color: var(--tr7nn-text-light);
            font-size: 13px;
        }

        /* 响应式适配 */
        @media (max-width: 768px) {
            .tr7nn-nav-menu {
                display: none; /* 简化移动端，实际开发中应有汉堡菜单 */
            }
            .tr7nn-hero-container {
                flex-direction: column;
                text-align: center;
            }
            .tr7nn-hero-image img {
                transform: none !important;
            }
            .tr7nn-btn-outline {
                margin-left: 0;
                margin-top: 16px;
            }
            .tr7nn-grid {
                grid-template-columns: 1fr;
            }
            .tr7nn-security-matrix {
                padding: 32px 20px;
                margin: 24px 12px;
            }
            .tr7nn-footer-links {
                justify-content: flex-start;
            }
        }