:root {
            --lbqr81-primary: #005fb8;
            --lbqr81-primary-dark: #004585;
            --lbqr81-accent: #00d4ff;
            --lbqr81-bg: #f4f7fa;
            --lbqr81-text: #1e293b;
            --lbqr81-text-light: #64748b;
            --lbqr81-white: #ffffff;
            --lbqr81-radius: 16px;
            --lbqr81-shadow: 0 10px 30px -5px rgba(0, 95, 184, 0.1);
        }

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

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--lbqr81-bg);
            color: var(--lbqr81-text);
            line-height: 1.7;
            overflow-x: hidden;
            word-break: break-word;
        }

        /* 布局限制 */
        .lbqr81-container {
            max-width: 1320px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 导航栏 */
        .lbqr81-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: all 0.3s ease;
        }

        .lbqr81-nav {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            height: 80px;
            min-width: 0;
        }

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

        .lbqr81-logo img {
            height: 42px;
            width: auto;
            object-fit: contain;
        }

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

        .lbqr81-menu li a {
            text-decoration: none;
            color: var(--lbqr81-text);
            font-weight: 500;
            font-size: 14px;
            padding: 8px 16px;
            border-radius: 50px;
            transition: all 0.2s ease;
            white-space: nowrap;
        }

        .lbqr81-menu li a:hover {
            color: var(--lbqr81-primary);
            background: rgba(0, 95, 184, 0.05);
        }

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

        /* Hero 下载区 */
        .lbqr81-hero {
            padding-top: 160px;
            padding-bottom: 96px;
            background: radial-gradient(circle at top right, rgba(0, 212, 255, 0.08), transparent),
                        radial-gradient(circle at bottom left, rgba(0, 95, 184, 0.05), transparent);
        }

        .lbqr81-hero-grid {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
            min-width: 0;
        }

        .lbqr81-hero-content {
            flex: 1;
            min-width: 320px;
        }

        .lbqr81-hero-title {
            font-size: clamp(2rem, 4vw + 0.5rem, 3.5rem);
            font-weight: 800;
            line-height: 1.2;
            color: var(--lbqr81-primary-dark);
            margin-bottom: 24px;
            word-break: keep-all;
        }

        .lbqr81-hero-subtitle {
            font-size: clamp(1rem, 1.2vw + 0.2rem, 1.25rem);
            color: var(--lbqr81-text-light);
            margin-bottom: 40px;
            max-width: 600px;
        }

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

        .lbqr81-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 18px 36px;
            border-radius: 12px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            min-width: 180px;
        }

        .lbqr81-btn-primary {
            background: var(--lbqr81-primary);
            color: var(--lbqr81-white);
            box-shadow: 0 4px 15px rgba(0, 95, 184, 0.3);
        }

        .lbqr81-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(0, 95, 184, 0.4);
            background: var(--lbqr81-primary-dark);
        }

        .lbqr81-btn-outline {
            border: 2px solid var(--lbqr81-primary);
            color: var(--lbqr81-primary);
        }

        .lbqr81-btn-outline:hover {
            background: rgba(0, 95, 184, 0.05);
            transform: translateY(-3px);
        }

        .lbqr81-hero-visual {
            flex: 1;
            min-width: 320px;
            position: relative;
        }

        .lbqr81-hero-visual img {
            width: 100%;
            height: auto;
            border-radius: var(--lbqr81-radius);
            box-shadow: 0 30px 60px -12px rgba(0, 0, 0, 0.15);
            border: 8px solid var(--lbqr81-white);
        }

        /* 核心技术分解 */
        .lbqr81-section {
            padding: 96px 0;
        }

        .lbqr81-section-title {
            text-align: center;
            margin-bottom: 64px;
        }

        .lbqr81-section-title h2 {
            font-size: clamp(1.8rem, 3vw, 2.5rem);
            font-weight: 700;
            margin-bottom: 16px;
        }

        .lbqr81-tech-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
        }

        .lbqr81-tech-card {
            background: var(--lbqr81-white);
            padding: 40px;
            border-radius: var(--lbqr81-radius);
            border: 1px solid rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
            height: 100%;
        }

        .lbqr81-tech-card:hover {
            border-color: var(--lbqr81-primary);
            transform: translateY(-8px);
            box-shadow: var(--lbqr81-shadow);
        }

        .lbqr81-tech-icon {
            font-size: 32px;
            margin-bottom: 24px;
            display: block;
        }

        .lbqr81-tech-card h3 {
            font-size: 20px;
            margin-bottom: 16px;
            color: var(--lbqr81-primary-dark);
        }

        .lbqr81-plugin-list {
            list-style: none;
            margin-top: 16px;
        }

        .lbqr81-plugin-list li {
            font-size: 14px;
            margin-bottom: 8px;
            padding-left: 20px;
            position: relative;
        }

        .lbqr81-plugin-list li::before {
            content: "•";
            position: absolute;
            left: 0;
            color: var(--lbqr81-primary);
            font-weight: bold;
        }

        /* 平台与安全 */
        .lbqr81-split-section {
            display: flex;
            flex-wrap: wrap;
            gap: 64px;
            align-items: center;
            background: var(--lbqr81-white);
            padding: 80px;
            border-radius: 40px;
            margin-bottom: 48px;
            min-width: 0;
        }

        .lbqr81-split-image {
            flex: 1;
            min-width: 300px;
        }

        .lbqr81-split-image img {
            width: 100%;
            border-radius: 20px;
        }

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

        .lbqr81-badge-container {
            display: flex;
            align-items: center;
            gap: 24px;
            margin-top: 32px;
        }

        .lbqr81-security-img {
            width: 80px;
            height: 80px;
            object-fit: cover;
            border-radius: 50%;
        }

        /* 历史回顾 */
        .lbqr81-history-box {
            position: relative;
            background: #0f172a;
            color: var(--lbqr81-white);
            border-radius: 40px;
            padding: 80px 48px;
            overflow: hidden;
        }

        .lbqr81-history-bg {
            position: absolute;
            top: 0;
            right: 0;
            width: 50%;
            height: 100%;
            opacity: 0.2;
            object-fit: cover;
            mask-image: linear-gradient(to left, black, transparent);
        }

        .lbqr81-history-content {
            position: relative;
            z-index: 2;
            max-width: 600px;
        }

        .lbqr81-era-item {
            margin-bottom: 40px;
            border-left: 2px solid var(--lbqr81-accent);
            padding-left: 24px;
        }

        .lbqr81-era-title {
            font-weight: 700;
            font-size: 18px;
            color: var(--lbqr81-accent);
            margin-bottom: 8px;
        }

        /* 页脚 */
        .lbqr81-footer {
            background: #f8fafc;
            padding: 80px 0 40px;
            border-top: 1px solid rgba(0, 0, 0, 0.05);
        }

        .lbqr81-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 64px;
        }

        .lbqr81-footer-brand h4 {
            font-size: 24px;
            font-weight: 800;
            margin-bottom: 16px;
            color: var(--lbqr81-primary-dark);
        }

        .lbqr81-footer-links h5 {
            margin-bottom: 24px;
            font-weight: 700;
        }

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

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

        .lbqr81-footer-links a {
            text-decoration: none;
            color: var(--lbqr81-text-light);
            transition: color 0.2s;
        }

        .lbqr81-footer-links a:hover {
            color: var(--lbqr81-primary);
        }

        .lbqr81-copyright {
            text-align: center;
            padding-top: 40px;
            border-top: 1px solid rgba(0, 0, 0, 0.05);
            color: var(--lbqr81-text-light);
            font-size: 14px;
        }

        /* 响应式适配 */
        @media (max-width: 992px) {
            .lbqr81-split-section {
                padding: 40px;
            }
        }

        @media (max-width: 768px) {
            .lbqr81-nav {
                height: auto;
                padding: 16px 0;
            }
            .lbqr81-menu {
                width: 100%;
                justify-content: center;
                margin-top: 16px;
            }
            .lbqr81-hero {
                padding-top: 180px;
                text-align: center;
            }
            .lbqr81-hero-content {
                order: 2;
            }
            .lbqr81-hero-visual {
                order: 1;
            }
            .lbqr81-download-actions {
                justify-content: center;
            }
            .lbqr81-split-section {
                flex-direction: column;
            }
        }