:root {
            --tr7nn-primary: #4285F4;
            --tr7nn-secondary: #EA4335;
            --tr7nn-tertiary: #FBBC04;
            --tr7nn-quaternary: #34A853;
            --tr7nn-text-dark: #202124;
            --tr7nn-text-light: #5F6368;
            --tr7nn-bg-gray: #F8F9FA;
            --tr7nn-white: #FFFFFF;
            --tr7nn-max-width: 1100px;
            --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, "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--tr7nn-text-dark);
            line-height: 1.6;
            background-color: var(--tr7nn-white);
            overflow-x: hidden;
            word-break: break-word;
        }

        /* 导航系统 */
        .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-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;
            min-height: 72px;
        }

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

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

        .tr7nn-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 8px;
            min-width: 0;
        }

        .tr7nn-nav-link {
            text-decoration: none;
            color: var(--tr7nn-text-light);
            font-size: 14px;
            font-weight: 500;
            padding: 8px 16px;
            border-radius: 20px;
            transition: var(--tr7nn-transition);
            white-space: nowrap;
        }

        .tr7nn-nav-link:hover {
            background-color: rgba(66, 133, 244, 0.08);
            color: var(--tr7nn-primary);
        }

        .tr7nn-nav-link.tr7nn-active {
            background-color: var(--tr7nn-primary);
            color: var(--tr7nn-white);
        }

        /* Hero 区块 - 独特非对称布局 */
        .tr7nn-hero {
            padding: 160px 24px 96px;
            background: radial-gradient(circle at 90% 10%, rgba(66, 133, 244, 0.05), transparent 40%),
                        radial-gradient(circle at 10% 90%, rgba(52, 168, 83, 0.05), transparent 40%);
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
        }

        .tr7nn-hero-inner {
            max-width: var(--tr7nn-max-width);
            width: 100%;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 48px;
        }

        .tr7nn-hero-text {
            flex: 1 1 500px;
            min-width: 0;
        }

        .tr7nn-hero-tag {
            display: inline-block;
            background: rgba(66, 133, 244, 0.1);
            color: var(--tr7nn-primary);
            padding: 4px 12px;
            border-radius: 4px;
            font-size: 14px;
            font-weight: 700;
            margin-bottom: 24px;
        }

        .tr7nn-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4rem);
            line-height: 1.1;
            font-weight: 800;
            color: var(--tr7nn-text-dark);
            margin-bottom: 24px;
            letter-spacing: -0.02em;
        }

        .tr7nn-hero-subtitle {
            font-size: clamp(1.1rem, 1vw + 0.8rem, 1.4rem);
            color: var(--tr7nn-text-light);
            margin-bottom: 40px;
            max-width: 600px;
            line-height: 1.6;
        }

        .tr7nn-hero-visual {
            flex: 1 1 400px;
            min-width: 0;
            position: relative;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        /* 模拟密码管理器的视觉效果 */
        .tr7nn-vault-card {
            background: var(--tr7nn-white);
            border-radius: 24px;
            box-shadow: 0 24px 48px rgba(0,0,0,0.1);
            padding: 32px;
            width: 100%;
            max-width: 400px;
            border: 1px solid rgba(0,0,0,0.05);
            transform: rotate(-2deg);
            transition: var(--tr7nn-transition);
        }

        .tr7nn-vault-card:hover {
            transform: rotate(0deg) translateY(-10px);
        }

        .tr7nn-vault-item {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 16px 0;
            border-bottom: 1px solid #f0f0f0;
        }

        .tr7nn-vault-icon {
            width: 40px;
            height: 40px;
            border-radius: 8px;
            background: var(--tr7nn-bg-gray);
        }

        .tr7nn-vault-dots {
            height: 8px;
            width: 80px;
            background: #e0e0e0;
            border-radius: 4px;
        }

        /* 安全矩阵区块 */
        .tr7nn-matrix-section {
            padding: 96px 24px;
            background-color: var(--tr7nn-bg-gray);
        }

        .tr7nn-section-header {
            max-width: var(--tr7nn-max-width);
            margin: 0 auto 64px;
            text-align: center;
        }

        .tr7nn-section-title {
            font-size: clamp(1.8rem, 3vw + 0.5rem, 2.5rem);
            margin-bottom: 16px;
        }

        .tr7nn-matrix-grid {
            max-width: var(--tr7nn-max-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 24px;
        }

        .tr7nn-matrix-card {
            background: var(--tr7nn-white);
            padding: 32px;
            border-radius: 16px;
            transition: var(--tr7nn-transition);
            border: 1px solid transparent;
            display: flex;
            flex-direction: column;
            min-width: 0;
        }

        .tr7nn-matrix-card:hover {
            border-color: var(--tr7nn-primary);
            box-shadow: 0 12px 24px rgba(66, 133, 244, 0.1);
            transform: translateY(-5px);
        }

        .tr7nn-matrix-protocol {
            font-weight: 800;
            color: var(--tr7nn-primary);
            margin-bottom: 12px;
            text-transform: uppercase;
            font-size: 12px;
            letter-spacing: 0.1em;
        }

        .tr7nn-matrix-func {
            font-size: 16px;
            color: var(--tr7nn-text-dark);
            margin-bottom: 16px;
            flex-grow: 1;
        }

        .tr7nn-matrix-status {
            font-size: 13px;
            color: var(--tr7nn-quaternary);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .tr7nn-matrix-status::before {
            content: "";
            width: 8px;
            height: 8px;
            background: var(--tr7nn-quaternary);
            border-radius: 50%;
        }

        /* 动态内容区块 */
        .tr7nn-news-section {
            padding: 96px 24px;
            max-width: var(--tr7nn-max-width);
            margin: 0 auto;
        }

        .tr7nn-news-container {
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
        }

        .tr7nn-news-main {
            flex: 2 1 500px;
            min-width: 0;
            background: linear-gradient(135deg, var(--tr7nn-primary), #1a73e8);
            border-radius: 24px;
            padding: 48px;
            color: var(--tr7nn-white);
        }

        .tr7nn-news-side {
            flex: 1 1 300px;
            min-width: 0;
            display: flex;
            flex-direction: column;
            gap: 24px;
        }

        .tr7nn-feature-item {
            padding: 24px;
            border-radius: 16px;
            background: #fdfdfd;
            border: 1px solid #eee;
        }

        /* 页脚 */
        .tr7nn-footer {
            padding: 64px 24px;
            border-top: 1px solid #eee;
            background: var(--tr7nn-white);
        }

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

        .tr7nn-footer-brand {
            font-weight: 700;
            font-size: 20px;
            color: var(--tr7nn-text-dark);
        }

        .tr7nn-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            list-style: none;
        }

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

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

        .tr7nn-copyright {
            width: 100%;
            text-align: center;
            margin-top: 48px;
            color: #bdc1c6;
            font-size: 12px;
        }

        /* 按钮组件 */
        .tr7nn-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 16px 32px;
            border-radius: 30px;
            font-weight: 600;
            text-decoration: none;
            transition: var(--tr7nn-transition);
            cursor: pointer;
            border: none;
            font-size: 16px;
        }

        .tr7nn-btn-primary {
            background: var(--tr7nn-primary);
            color: var(--tr7nn-white);
            box-shadow: 0 4px 12px rgba(66, 133, 244, 0.3);
        }

        .tr7nn-btn-primary:hover {
            background: #1a73e8;
            box-shadow: 0 8px 20px rgba(66, 133, 244, 0.4);
            transform: translateY(-2px);
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .tr7nn-nav-menu {
                display: none; /* 简化移动端，实际开发中会使用汉堡菜单 */
            }
            .tr7nn-hero-inner {
                flex-direction: column;
                text-align: center;
            }
            .tr7nn-hero-subtitle {
                margin-left: auto;
                margin-right: auto;
            }
            .tr7nn-news-main {
                padding: 32px;
            }
        }