: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-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: "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--tr7nn-text);
            background-color: var(--tr7nn-bg);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: break-word;
        }

        /* 布局容器 */
        .tr7nn-container {
            max-width: 1300px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* 导航栏 */
        .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;
            justify-content: space-between;
            align-items: center;
            height: 72px;
            flex-wrap: wrap;
        }

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

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

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

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

        .tr7nn-menu-link:hover {
            background: rgba(0,0,0,0.04);
            color: var(--tr7nn-primary);
        }

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

        /* Hero 区 - 非对称创意布局 */
        .tr7nn-hero {
            padding: 160px 0 96px;
            background: radial-gradient(circle at 90% 10%, rgba(66, 133, 244, 0.05) 0%, transparent 40%),
                        radial-gradient(circle at 10% 90%, rgba(52, 168, 83, 0.05) 0%, transparent 40%);
            position: relative;
            overflow: hidden;
        }

        .tr7nn-hero-grid {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 48px;
        }

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

        .tr7nn-hero-tag {
            display: inline-block;
            padding: 6px 16px;
            background: var(--tr7nn-bg-alt);
            border-radius: 30px;
            font-size: 14px;
            color: var(--tr7nn-primary);
            margin-bottom: 24px;
            font-weight: 600;
            border: 1px solid rgba(66, 133, 244, 0.2);
        }

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

        .tr7nn-hero-subtitle {
            font-size: clamp(1.1rem, 1.5vw + 0.5rem, 1.4rem);
            color: var(--tr7nn-text-light);
            margin-bottom: 40px;
            max-width: 600px;
            line-height: 1.6;
        }

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

        /* 纯CSS装饰性图形 */
        .tr7nn-browser-mockup {
            width: 100%;
            max-width: 540px;
            aspect-ratio: 16/10;
            background: white;
            border-radius: 12px;
            box-shadow: 0 32px 64px rgba(0,0,0,0.1);
            border: 1px solid rgba(0,0,0,0.08);
            position: relative;
            padding-top: 30px;
        }

        .tr7nn-mockup-dots {
            position: absolute;
            top: 12px;
            left: 15px;
            display: flex;
            gap: 6px;
        }

        .tr7nn-dot { width: 8px; height: 8px; border-radius: 50%; }
        .tr7nn-dot-r { background: var(--tr7nn-red); }
        .tr7nn-dot-y { background: var(--tr7nn-yellow); }
        .tr7nn-dot-g { background: var(--tr7nn-green); }

        .tr7nn-mockup-inner {
            height: 100%;
            background: linear-gradient(135deg, #f1f3f4 0%, #e8eaed 100%);
            margin: 0 10px 10px;
            border-radius: 4px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 900;
            font-size: 80px;
            color: white;
            text-shadow: 0 4px 12px rgba(0,0,0,0.05);
        }

        /* 安全矩阵区块 */
        .tr7nn-section {
            padding: 96px 0;
        }

        .tr7nn-section-header {
            text-align: center;
            margin-bottom: 64px;
        }

        .tr7nn-section-title {
            font-size: clamp(2rem, 3vw, 2.5rem);
            margin-bottom: 16px;
            font-weight: 700;
        }

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

        .tr7nn-matrix-card {
            background: var(--tr7nn-bg);
            padding: 40px;
            border-radius: var(--tr7nn-radius);
            border: 1px solid rgba(0,0,0,0.05);
            transition: var(--tr7nn-transition);
            display: flex;
            flex-direction: column;
            height: 100%;
        }

        .tr7nn-matrix-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.08);
            border-color: var(--tr7nn-primary);
        }

        .tr7nn-card-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: var(--tr7nn-bg-alt);
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: white;
        }

        .tr7nn-card-title {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .tr7nn-card-text {
            color: var(--tr7nn-text-light);
            font-size: 15px;
            flex-grow: 1;
        }

        .tr7nn-card-status {
            margin-top: 24px;
            font-size: 13px;
            padding: 4px 12px;
            background: #e6f4ea;
            color: var(--tr7nn-green);
            border-radius: 4px;
            display: inline-block;
            align-self: flex-start;
        }

        /* 极速下载 CTA 区块 */
        .tr7nn-cta-section {
            background: var(--tr7nn-text);
            color: white;
            border-radius: 32px;
            padding: 80px 40px;
            text-align: center;
            margin-bottom: 96px;
            position: relative;
            overflow: hidden;
        }

        .tr7nn-cta-section::after {
            content: '';
            position: absolute;
            top: -50%;
            right: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(66,133,244,0.2) 0%, transparent 70%);
            pointer-events: none;
        }

        .tr7nn-cta-title {
            font-size: clamp(1.8rem, 4vw, 2.8rem);
            margin-bottom: 24px;
            font-weight: 700;
        }

        .tr7nn-btn {
            display: inline-block;
            padding: 18px 48px;
            background: var(--tr7nn-primary);
            color: white;
            text-decoration: none;
            border-radius: 50px;
            font-weight: 600;
            font-size: 18px;
            transition: var(--tr7nn-transition);
            box-shadow: 0 4px 14px rgba(66, 133, 244, 0.4);
        }

        .tr7nn-btn:hover {
            background: #3367d6;
            transform: scale(1.05);
            box-shadow: 0 6px 20px rgba(66, 133, 244, 0.6);
        }

        /* 页脚 */
        .tr7nn-footer {
            padding: 64px 0 32px;
            background: var(--tr7nn-bg-alt);
            border-top: 1px solid rgba(0,0,0,0.05);
        }

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

        .tr7nn-footer-brand {
            flex: 1;
            min-width: 240px;
        }

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

        .tr7nn-footer-links {
            display: flex;
            gap: 64px;
            flex-wrap: wrap;
        }

        .tr7nn-link-group h4 {
            margin-bottom: 20px;
            font-size: 14px;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: var(--tr7nn-text-light);
        }

        .tr7nn-link-group ul {
            list-style: none;
        }

        .tr7nn-link-group li {
            margin-bottom: 12px;
        }

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

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

        .tr7nn-copyright {
            padding-top: 32px;
            border-top: 1px solid rgba(0,0,0,0.05);
            text-align: center;
            font-size: 13px;
            color: #80868b;
        }

        /* 响应式调整 */
        @media (max-width: 1024px) {
            .tr7nn-hero-title { font-size: 3rem; }
            .tr7nn-footer-links { gap: 32px; }
        }

        @media (max-width: 768px) {
            .tr7nn-nav-wrapper { height: auto; padding: 12px 0; }
            .tr7nn-menu { margin-top: 12px; width: 100%; justify-content: center; }
            .tr7nn-hero { padding: 120px 0 64px; text-align: center; }
            .tr7nn-hero-subtitle { margin-left: auto; margin-right: auto; }
            .tr7nn-hero-grid { flex-direction: column; }
            .tr7nn-hero-visual { order: -1; }
            .tr7nn-matrix-grid { grid-template-columns: 1fr; }
            .tr7nn-footer-grid { flex-direction: column; gap: 32px; }
        }