:root {
            --tr7nn-bg-primary: #202124;
            --tr7nn-bg-secondary: #292a2d;
            --tr7nn-text-primary: #e8eaed;
            --tr7nn-text-secondary: #9aa0a6;
            --tr7nn-accent: #8ab4f8;
            --tr7nn-success: #81c995;
            --tr7nn-warning: #fdd663;
            --tr7nn-danger: #f28b82;
            --tr7nn-container-width: 1100px;
            --tr7nn-spacing: 8px;
        }

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

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

        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.3s ease;
        }

        /* 导航栏设计 */
        .tr7nn-navbar {
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(32, 33, 36, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

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

        .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: calc(var(--tr7nn-spacing) * 3);
            min-width: 0;
        }

        .tr7nn-nav-item a {
            font-size: 14px;
            color: var(--tr7nn-text-secondary);
            font-weight: 500;
            padding: 8px 4px;
            position: relative;
        }

        .tr7nn-nav-item a:hover {
            color: var(--tr7nn-accent);
        }

        .tr7nn-nav-item a.active {
            color: var(--tr7nn-accent);
        }

        .tr7nn-nav-item a.active::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--tr7nn-accent);
            border-radius: 2px;
        }

        /* Hero 区块 - 独特居中隐形视觉 */
        .tr7nn-hero {
            padding: 160px 24px 80px;
            text-align: center;
            background: radial-gradient(circle at center, #35363a 0%, #202124 70%);
        }

        .tr7nn-hero-content {
            max-width: 800px;
            margin: 0 auto;
            word-break: break-word;
        }

        .tr7nn-incognito-icon {
            width: 120px;
            height: 120px;
            margin: 0 auto 32px;
            background: var(--tr7nn-bg-secondary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 0 40px rgba(0, 0, 0, 0.5);
        }

        /* 使用SVG绘制无痕模式图标 */
        .tr7nn-incognito-svg {
            fill: var(--tr7nn-text-primary);
            width: 64px;
            height: 64px;
        }

        .tr7nn-hero-title {
            font-size: clamp(2rem, 5vw + 1rem, 3.5rem);
            font-weight: 700;
            margin-bottom: 24px;
            color: var(--tr7nn-text-primary);
            line-height: 1.2;
        }

        .tr7nn-hero-subtitle {
            font-size: clamp(1rem, 2vw + 0.5rem, 1.25rem);
            color: var(--tr7nn-text-secondary);
            max-width: 600px;
            margin: 0 auto 40px;
            line-height: 1.8;
        }

        .tr7nn-btn-primary {
            display: inline-block;
            background-color: var(--tr7nn-accent);
            color: var(--tr7nn-bg-primary);
            padding: 16px 48px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 18px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .tr7nn-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 24px rgba(138, 180, 248, 0.3);
        }

        /* 安全矩阵区块 - Grid布局 */
        .tr7nn-security-section {
            padding: 80px 24px;
            max-width: var(--tr7nn-container-width);
            margin: 0 auto;
        }

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

        .tr7nn-section-tag {
            color: var(--tr7nn-accent);
            text-transform: uppercase;
            letter-spacing: 2px;
            font-size: 14px;
            font-weight: 700;
            margin-bottom: 16px;
            display: block;
        }

        .tr7nn-matrix-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
            min-width: 0;
        }

        .tr7nn-matrix-card {
            background: var(--tr7nn-bg-secondary);
            padding: 40px;
            border-radius: 24px;
            border: 1px solid rgba(255, 255, 255, 0.05);
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
            min-width: 0;
        }

        .tr7nn-matrix-card:hover {
            border-color: var(--tr7nn-accent);
            transform: translateY(-8px);
        }

        .tr7nn-protocol-tag {
            font-size: 12px;
            padding: 4px 12px;
            background: rgba(138, 180, 248, 0.1);
            color: var(--tr7nn-accent);
            border-radius: 12px;
            width: fit-content;
            margin-bottom: 20px;
        }

        .tr7nn-matrix-title {
            font-size: 20px;
            margin-bottom: 16px;
            color: #fff;
        }

        .tr7nn-matrix-desc {
            color: var(--tr7nn-text-secondary);
            font-size: 15px;
            line-height: 1.6;
            flex-grow: 1;
        }

        .tr7nn-matrix-status {
            margin-top: 24px;
            font-size: 13px;
            display: flex;
            align-items: center;
            color: var(--tr7nn-success);
        }

        .tr7nn-status-dot {
            width: 8px;
            height: 8px;
            background: var(--tr7nn-success);
            border-radius: 50%;
            margin-right: 8px;
            display: inline-block;
        }

        /* 深度隐私功能区块 - 交错布局 */
        .tr7nn-privacy-feature {
            padding: 80px 24px;
            background-color: var(--tr7nn-bg-secondary);
        }

        .tr7nn-feature-container {
            max-width: var(--tr7nn-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
        }

        .tr7nn-feature-content {
            flex: 1;
            min-width: 300px;
            word-break: break-word;
        }

        .tr7nn-feature-visual {
            flex: 1;
            min-width: 300px;
            background: linear-gradient(135deg, #3c4043 0%, #202124 100%);
            height: 400px;
            border-radius: 32px;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            overflow: hidden;
        }

        .tr7nn-privacy-graphic {
            width: 80%;
            height: 2px;
            background: rgba(138, 180, 248, 0.3);
            position: relative;
        }

        .tr7nn-privacy-graphic::before {
            content: '';
            position: absolute;
            top: -10px;
            left: 20%;
            width: 20px;
            height: 20px;
            background: var(--tr7nn-accent);
            border-radius: 50%;
            box-shadow: 0 0 20px var(--tr7nn-accent);
        }

        /* 动态资讯区块 */
        .tr7nn-news-section {
            padding: 80px 24px;
            max-width: var(--tr7nn-container-width);
            margin: 0 auto;
        }

        /* 页脚设计 */
        .tr7nn-footer {
            padding: 64px 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            background: var(--tr7nn-bg-primary);
        }

        .tr7nn-footer-container {
            max-width: var(--tr7nn-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 40px;
        }

        .tr7nn-footer-brand {
            flex: 1;
            min-width: 200px;
        }

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

        .tr7nn-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            min-width: 300px;
        }

        .tr7nn-footer-column h4 {
            font-size: 14px;
            color: #fff;
            margin-bottom: 20px;
        }

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

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

        .tr7nn-footer-column a {
            font-size: 14px;
            color: var(--tr7nn-text-secondary);
        }

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

        .tr7nn-copyright {
            margin-top: 64px;
            text-align: center;
            font-size: 12px;
            color: var(--tr7nn-text-secondary);
            width: 100%;
        }

        /* 响应式调整 */
        @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-feature-container {
                flex-direction: column;
                text-align: center;
            }
            .tr7nn-matrix-grid {
                grid-template-columns: 1fr;
            }
            .tr7nn-hero {
                padding-top: 120px;
            }
        }