:root {
            --lbqr81-primary: #004a99;
            --lbqr81-primary-dark: #003366;
            --lbqr81-accent: #ff8c00;
            --lbqr81-bg-light: #f8fafc;
            --lbqr81-text-main: #1e293b;
            --lbqr81-text-muted: #64748b;
            --lbqr81-white: #ffffff;
            --lbqr81-border: #e2e8f0;
            --lbqr81-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
            --lbqr81-container-width: 1300px;
        }

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

        body {
            font-family: "Inter", "Segoe UI", "PingFang SC", sans-serif;
            background-color: var(--lbqr81-bg-light);
            color: var(--lbqr81-text-main);
            line-height: 1.6;
            word-break: keep-all;
            overflow-wrap: break-word;
        }

        /* 导航栏 */
        .lbqr81-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            z-index: 1000;
            border-bottom: 1px solid var(--lbqr81-border);
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
        }

        .lbqr81-nav-container {
            max-width: var(--lbqr81-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 0 24px;
            height: 80px;
        }

        .lbqr81-logo {
            display: flex;
            align-items: center;
            min-width: 0;
        }

        .lbqr81-logo img {
            height: 48px;
            width: auto;
            object-fit: contain;
        }

        .lbqr81-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 8px;
            min-width: 0;
        }

        .lbqr81-menu li a {
            text-decoration: none;
            color: var(--lbqr81-text-main);
            font-weight: 500;
            padding: 8px 16px;
            border-radius: 6px;
            transition: all 0.3s ease;
            font-size: clamp(0.9rem, 1vw + 0.2rem, 1rem);
        }

        .lbqr81-menu li a:hover {
            background: rgba(0, 74, 153, 0.05);
            color: var(--lbqr81-primary);
        }

        .lbqr81-menu li a.active {
            background: var(--lbqr81-primary);
            color: var(--lbqr81-white);
        }

        /* Hero 下载区 */
        .lbqr81-hero-download {
            margin-top: 80px;
            padding: 96px 24px;
            background: linear-gradient(135deg, #001f3f 0%, #004a99 100%);
            color: var(--lbqr81-white);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .lbqr81-hero-download::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-image: radial-gradient(circle at 2px 2px, rgba(255,255,255,0.05) 1px, transparent 0);
            background-size: 32px 32px;
        }

        .lbqr81-hero-content {
            position: relative;
            z-index: 1;
            max-width: 800px;
            margin: 0 auto;
        }

        .lbqr81-hero-title {
            font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 24px;
        }

        .lbqr81-hero-subtitle {
            font-size: clamp(1rem, 1.5vw + 0.5rem, 1.25rem);
            opacity: 0.9;
            margin-bottom: 48px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        .lbqr81-download-panel {
            background: var(--lbqr81-white);
            border-radius: 20px;
            padding: 32px;
            color: var(--lbqr81-text-main);
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            align-items: center;
            justify-content: center;
            box-shadow: 0 20px 40px rgba(0,0,0,0.2);
            max-width: 900px;
            margin: 0 auto;
        }

        .lbqr81-version-info {
            text-align: left;
            flex: 1;
            min-width: 280px;
        }

        .lbqr81-version-tag {
            display: inline-block;
            background: #e0f2fe;
            color: #0369a1;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.875rem;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .lbqr81-version-title {
            font-size: 1.75rem;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .lbqr81-version-meta {
            color: var(--lbqr81-text-muted);
            font-size: 0.9rem;
        }

        .lbqr81-btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            min-width: 0;
        }

        .lbqr81-btn-main {
            background: var(--lbqr81-primary);
            color: var(--lbqr81-white);
            text-decoration: none;
            padding: 16px 32px;
            border-radius: 12px;
            font-weight: 700;
            font-size: 1.125rem;
            transition: transform 0.2s ease, box-shadow 0.2s ease;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }

        .lbqr81-btn-main:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 74, 153, 0.3);
            background: var(--lbqr81-primary-dark);
        }

        /* 核心优势网格 */
        .lbqr81-section {
            padding: 96px 24px;
            max-width: var(--lbqr81-container-width);
            margin: 0 auto;
        }

        .lbqr81-section-title {
            text-align: center;
            font-size: 2.5rem;
            font-weight: 800;
            margin-bottom: 64px;
            color: var(--lbqr81-primary-dark);
        }

        .lbqr81-grid-anatomy {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 32px;
        }

        .lbqr81-anatomy-card {
            background: var(--lbqr81-white);
            padding: 40px;
            border-radius: 16px;
            border: 1px solid var(--lbqr81-border);
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
        }

        .lbqr81-anatomy-card:hover {
            border-color: var(--lbqr81-primary);
            box-shadow: var(--lbqr81-shadow);
        }

        .lbqr81-anatomy-icon {
            width: 48px;
            height: 48px;
            background: rgba(0, 74, 153, 0.1);
            border-radius: 12px;
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: var(--lbqr81-primary);
        }

        .lbqr81-anatomy-name {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .lbqr81-anatomy-detail {
            color: var(--lbqr81-text-muted);
            font-size: 1rem;
            margin-bottom: 24px;
        }

        .lbqr81-plugin-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .lbqr81-plugin-item {
            font-size: 0.9rem;
            padding-left: 20px;
            position: relative;
        }

        .lbqr81-plugin-item::before {
            content: "";
            position: absolute;
            left: 0;
            top: 10px;
            width: 6px;
            height: 6px;
            background: var(--lbqr81-accent);
            border-radius: 50%;
        }

        /* 场景工作流 */
        .lbqr81-workflow-section {
            background: #f1f5f9;
            padding: 96px 24px;
        }

        .lbqr81-workflow-container {
            max-width: var(--lbqr81-container-width);
            margin: 0 auto;
        }

        .lbqr81-workflow-box {
            display: flex;
            flex-wrap: wrap;
            gap: 64px;
            align-items: center;
            margin-bottom: 96px;
        }

        .lbqr81-workflow-box:nth-child(even) {
            flex-direction: row-reverse;
        }

        .lbqr81-workflow-text {
            flex: 1;
            min-width: 300px;
        }

        .lbqr81-workflow-tag {
            color: var(--lbqr81-accent);
            text-transform: uppercase;
            letter-spacing: 2px;
            font-weight: 700;
            margin-bottom: 16px;
            display: block;
        }

        .lbqr81-workflow-title {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 24px;
        }

        .lbqr81-workflow-steps {
            list-style: none;
        }

        .lbqr81-step {
            margin-bottom: 16px;
            padding: 16px;
            background: var(--lbqr81-white);
            border-radius: 12px;
            border-left: 4px solid var(--lbqr81-primary);
            font-weight: 500;
        }

        .lbqr81-workflow-visual {
            flex: 1;
            min-width: 300px;
            background: #cbd5e1;
            height: 400px;
            border-radius: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.25rem;
            color: #475569;
            font-weight: 600;
            border: 8px solid var(--lbqr81-white);
            box-shadow: var(--lbqr81-shadow);
        }

        /* 发展历程 - 时间轴 */
        .lbqr81-roadmap {
            padding: 96px 24px;
            max-width: var(--lbqr81-container-width);
            margin: 0 auto;
        }

        .lbqr81-roadmap-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            justify-content: center;
        }

        .lbqr81-roadmap-item {
            flex: 1;
            min-width: 280px;
            background: var(--lbqr81-white);
            padding: 32px;
            border-radius: 12px;
            border: 1px solid var(--lbqr81-border);
            position: relative;
        }

        .lbqr81-era {
            font-weight: 800;
            color: var(--lbqr81-primary);
            margin-bottom: 8px;
        }

        .lbqr81-focus {
            color: var(--lbqr81-text-muted);
        }

        /* 页脚 */
        .lbqr81-footer {
            background: #0f172a;
            color: var(--lbqr81-white);
            padding: 80px 24px 40px;
        }

        .lbqr81-footer-content {
            max-width: var(--lbqr81-container-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            padding-bottom: 48px;
            margin-bottom: 40px;
        }

        .lbqr81-footer-brand h3 {
            font-size: 1.5rem;
            margin-bottom: 16px;
        }

        .lbqr81-footer-brand p {
            color: #94a3b8;
            font-size: 0.9rem;
        }

        .lbqr81-footer-links h4 {
            margin-bottom: 24px;
            font-size: 1.1rem;
        }

        .lbqr81-footer-links ul {
            list-style: none;
        }

        .lbqr81-footer-links ul li {
            margin-bottom: 12px;
        }

        .lbqr81-footer-links ul li a {
            color: #94a3b8;
            text-decoration: none;
            transition: color 0.3s;
        }

        .lbqr81-footer-links ul li a:hover {
            color: var(--lbqr81-accent);
        }

        .lbqr81-bottom-bar {
            text-align: center;
            color: #64748b;
            font-size: 0.875rem;
        }

        /* 响应式断点 */
        @media (max-width: 768px) {
            .lbqr81-nav-container {
                height: auto;
                padding: 16px;
            }
            .lbqr81-menu {
                width: 100%;
                justify-content: center;
                margin-top: 16px;
            }
            .lbqr81-hero-download {
                padding: 64px 24px;
            }
            .lbqr81-download-panel {
                padding: 24px;
            }
            .lbqr81-grid-anatomy {
                grid-template-columns: 1fr;
            }
        }