:root {
            --tr7nn-primary: #4285F4;
            --tr7nn-danger: #EA4335;
            --tr7nn-warning: #FBBC04;
            --tr7nn-success: #34A853;
            --tr7nn-text-main: #202124;
            --tr7nn-text-sub: #5f6368;
            --tr7nn-bg-light: #ffffff;
            --tr7nn-bg-gray: #f8f9fa;
            --tr7nn-container-width: 1100px;
            --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", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--tr7nn-text-main);
            background-color: var(--tr7nn-bg-light);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: break-word;
        }

        /* 导航栏设计 */
        .tr7nn-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            padding: 0 24px;
        }

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

        .tr7nn-logo {
            flex-shrink: 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;
        }

        .tr7nn-nav-item a {
            text-decoration: none;
            color: var(--tr7nn-text-sub);
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 14px;
            font-weight: 500;
            transition: var(--tr7nn-transition);
        }

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

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

        /* Hero 区块 - 独特非对称设计 */
        .tr7nn-hero {
            padding: 80px 24px;
            background: radial-gradient(circle at 90% 10%, rgba(66, 133, 244, 0.05) 0%, transparent 40%);
            overflow: hidden;
        }

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

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

        .tr7nn-hero-title {
            font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 24px;
            color: var(--tr7nn-text-main);
            word-break: keep-all;
        }

        .tr7nn-hero-subtitle {
            font-size: clamp(1rem, 1.5vw + 0.5rem, 1.25rem);
            color: var(--tr7nn-text-sub);
            margin-bottom: 32px;
            max-width: 600px;
        }

        /* 快捷键可视化装饰 */
        .tr7nn-hero-visual {
            flex: 1;
            min-width: 320px;
            display: flex;
            justify-content: center;
            position: relative;
        }

        .tr7nn-kb-canvas {
            background: #202124;
            padding: 40px;
            border-radius: 24px;
            box-shadow: 0 20px 50px rgba(0,0,0,0.15);
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 12px;
            transform: perspective(1000px) rotateY(-15deg) rotateX(10deg);
        }

        .tr7nn-key {
            width: 60px;
            height: 60px;
            background: #3c4043;
            border-bottom: 4px solid #1a1c1e;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
            font-size: 14px;
        }

        .tr7nn-key-highlight {
            background: var(--tr7nn-primary);
            border-bottom-color: #1a73e8;
        }

        /* 快捷键分类列表 - 采用瀑布流 Grid */
        .tr7nn-shortcuts-section {
            padding: 96px 24px;
            background-color: var(--tr7nn-bg-gray);
        }

        .tr7nn-section-header {
            max-width: var(--tr7nn-container-width);
            margin: 0 auto 48px;
            text-align: center;
        }

        .tr7nn-grid-layout {
            max-width: var(--tr7nn-container-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 24px;
        }

        .tr7nn-category-card {
            background: var(--tr7nn-bg-light);
            padding: 32px;
            border-radius: var(--tr7nn-radius);
            box-shadow: 0 4px 6px rgba(0,0,0,0.02);
            transition: var(--tr7nn-transition);
            border: 1px solid rgba(0,0,0,0.05);
        }

        .tr7nn-category-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 24px rgba(0,0,0,0.08);
        }

        .tr7nn-card-title {
            font-size: 1.5rem;
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            gap: 12px;
            color: var(--tr7nn-primary);
        }

        .tr7nn-card-title::before {
            content: "";
            width: 4px;
            height: 24px;
            background: currentColor;
            border-radius: 2px;
        }

        .tr7nn-shortcut-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 12px 0;
            border-bottom: 1px solid #f1f3f4;
        }

        .tr7nn-shortcut-item:last-child {
            border-bottom: none;
        }

        .tr7nn-shortcut-desc {
            font-size: 14px;
            color: var(--tr7nn-text-main);
            font-weight: 500;
        }

        .tr7nn-shortcut-keys {
            display: flex;
            gap: 4px;
        }

        .tr7nn-kbd-tag {
            background: #f8f9fa;
            border: 1px solid #dadce0;
            border-radius: 4px;
            padding: 2px 6px;
            font-size: 12px;
            font-family: monospace;
            box-shadow: 0 1px 1px rgba(0,0,0,0.1);
        }

        /* 安全矩阵区块 */
        .tr7nn-security-matrix {
            padding: 96px 24px;
            background: #202124;
            color: white;
        }

        .tr7nn-matrix-grid {
            max-width: var(--tr7nn-container-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 32px;
        }

        .tr7nn-matrix-item {
            padding: 24px;
            border: 1px solid rgba(255,255,255,0.1);
            border-radius: 12px;
            transition: var(--tr7nn-transition);
        }

        .tr7nn-matrix-item:hover {
            background: rgba(255,255,255,0.05);
            border-color: var(--tr7nn-primary);
        }

        .tr7nn-protocol-tag {
            font-size: 12px;
            color: var(--tr7nn-success);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 12px;
            display: block;
        }

        .tr7nn-protocol-name {
            font-size: 1.25rem;
            margin-bottom: 12px;
        }

        .tr7nn-protocol-desc {
            font-size: 14px;
            color: #bdc1c6;
            line-height: 1.5;
        }

        /* 动态内容区块 */
        .tr7nn-dynamic-news {
            padding: 80px 24px;
            max-width: var(--tr7nn-container-width);
            margin: 0 auto;
        }

        /* 页脚设计 */
        .tr7nn-footer {
            background: #f8f9fa;
            padding: 64px 24px 32px;
            border-top: 1px solid #dadce0;
        }

        .tr7nn-footer-inner {
            max-width: var(--tr7nn-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            justify-content: space-between;
        }

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

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

        .tr7nn-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
        }

        .tr7nn-footer-group h4 {
            margin-bottom: 16px;
            font-size: 14px;
            color: var(--tr7nn-text-main);
        }

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

        .tr7nn-footer-group a {
            text-decoration: none;
            color: var(--tr7nn-text-sub);
            font-size: 14px;
            display: block;
            margin-bottom: 8px;
            transition: var(--tr7nn-transition);
        }

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

        .tr7nn-copyright {
            max-width: var(--tr7nn-container-width);
            margin: 48px auto 0;
            padding-top: 24px;
            border-top: 1px solid #e8eaed;
            font-size: 12px;
            color: var(--tr7nn-text-sub);
            text-align: center;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .tr7nn-nav-menu {
                display: none; /* 简化移动端，实际应有汉堡菜单 */
            }
            .tr7nn-hero {
                text-align: center;
            }
            .tr7nn-hero-inner {
                flex-direction: column;
            }
            .tr7nn-kb-canvas {
                transform: none;
                grid-template-columns: repeat(3, 1fr);
            }
            .tr7nn-grid-layout {
                grid-template-columns: 1fr;
            }
        }