:root {
            --primary-color: #3498db;
            --secondary-color: #2980b9;
            --dark-color: #2c3e50;
            --light-color: #ecf0f1;
            --accent-color: #e74c3c;
            --text-color: #333;
            --text-light: #fff;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        
        /* 隐藏元素 */
        .hidden {
            display: none;
        }
        
        /* 弹出容器样式 */
        #blank-container {
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 80%; /* 宽度调整为屏幕的 80% */
            max-width: 900px; /* 最大宽度限制 */
            height: auto; /* 高度自动调整 */
            max-height: 90%; /* 最大高度限制 */
            background: rgba(255, 255, 255, 0.95);
            border-radius: 12px; /* 更圆滑的边角 */
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3); /* 更深的阴影 */
            z-index: 1000;
            display: flex;
            overflow: hidden;
            opacity: 0.99; /* 设置透明度为 100% */
        }
        
        /* 左侧导航栏样式 */
        #blank-container .nav-bar {
            flex: 0 0 200px; /* 固定导航栏宽度 */
            background: var(--primary-color);
            color: var(--text-light);
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 30px 15px; /* 增加内边距 */
            box-shadow: inset -2px 0 5px rgba(0, 0, 0, 0.1); /* 内部阴影 */
            border-radius: 12px 0 0 12px; /* 添加圆角 */
        }
        
        #blank-container .nav-bar button {
            width: 100%;
            margin-bottom: 15px;
            padding: 12px;
            background: transparent;
            color: var(--text-light);
            border: none;
            cursor: pointer;
            text-align: left;
            font-size: 16px;
            transition: background 0.3s, transform 0.3s, color 0.3s;
        }
        
        #blank-container .nav-bar button:hover {
            background: rgba(255, 255, 255, 0.2);
            transform: scale(1.05); /* 悬停时放大效果 */
            color: var(--accent-color); /* 悬停时文字颜色变化 */
        }
        
        #blank-container .nav-bar button:active {
            background: rgba(255, 255, 255, 0.4);
            transform: scale(0.95); /* 点击时缩小效果 */
        }
        
        /* 右侧功能表单区域样式 */
        #blank-container .form-container {
            flex: 1;
            padding: 30px; /* 增加内边距 */
            overflow-y: auto;
            background: var(--light-color); /* 添加背景色 */
            border-radius: 0 12px 12px 0; /* 圆角 */
            box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.1); /* 内部阴影 */
        }
        
        #blank-container .form-container h2 {
            text-align: center; /* 标题居中 */
            font-size: 24px;
            color: var(--dark-color);
            margin-bottom: 20px;
        }
        
        /* 关闭按钮样式 */
        #blank-container .close-button {
            position: absolute;
            top: 10px;
            right: 10px;
            padding: 8px 12px;
            background: var(--accent-color);
            color: var(--text-light);
            border: none;
            border-radius: 50%; /* 圆形按钮 */
            cursor: pointer;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2); /* 添加阴影 */
            transition: background 0.3s, transform 0.3s;
        }
        
        #blank-container .close-button:hover {
            background: #c0392b; /* 悬停时颜色变化 */
            transform: rotate(90deg); /* 悬停时旋转效果 */
        }
        
        #blank-container .close-button:active {
            transform: scale(0.9); /* 点击时缩小效果 */
        }
        
        /* 表单按钮样式 */
        .form-container button {
            padding: 10px 20px;
            background: var(--primary-color);
            color: var(--text-light);
            border: none;
            border-radius: 4px;
            cursor: pointer;
            transition: var(--transition);
        }
        
        .form-container button:hover {
            background: var(--secondary-color);
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--text-color);
            line-height: 1.6;
            position: relative;
            min-height: 100vh;
            overflow-x: hidden;
        }
        
        /* 背景层 */
        body::before {
            content: "";
            position: fixed;
            top: 0;
            left: 0;
            width: 100vw;
            height: 100vh;
            z-index: -2;
            background: url('img/beijing.jpg') no-repeat center center;
            background-size: cover;
            filter: blur(5px);
        }
        
        /* 导航栏 */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            padding: 15px 0;
            background: transparent;
            backdrop-filter: none;
            box-shadow: none;
            z-index: 1000;
            transition: var(--transition);
        }
        
        .header.scrolled {
            padding: 10px 0;
            background: rgba(44, 62, 80, 0.9);
            backdrop-filter: blur(10px);
            box-shadow: var(--shadow);
        }
        
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        .logo {
            display: flex;
            align-items: center;
            font-size: 28px;
            font-weight: bold;
            color: var(--text-light);
            text-decoration: none;
        }
        
        .logo i {
            margin-right: 10px;
            color: var(--primary-color);
        }
        
        .nav {
            display: flex;
            gap: 60px;
        }
        
        .nav a {
            position: relative;
            color: var(--text-light);
            text-decoration: none;
            font-size: 18px;
            font-weight: 600;
            padding: 15px 0;
            transition: var(--transition);
            letter-spacing: 1px;
        }
        
        .nav a:hover {
            color: var(--primary-color);
        }
        
        .nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary-color);
            transition: var(--transition);
        }
        
        .nav a:hover::after {
            width: 100%;
        }
        
        .nav a.active::after {
            width: 100%;
        }
        
        /* 英雄区域 */
        .hero {
            height: 100vh;
            display: flex;
            align-items: center;
            position: relative;
            padding-top: 80px;
        }
        
        .hero-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
        }
        
        .hero-content {
            flex: 1;
            color: var(--text-light);
            max-width: 600px;
        }
        
        .hero-content h1 {
            font-size: 48px;
            font-weight: 700;
            margin-bottom: 20px;
            line-height: 1.2;
        }
        
        .hero-content p {
            font-size: 18px;
            margin-bottom: 30px;
            opacity: 0.9;
        }
        
        .btn {
            display: inline-block;
            padding: 12px 30px;
            background: var(--primary-color);
            color: var(--text-light);
            border: none;
            border-radius: 4px;
            font-size: 16px;
            font-weight: 600;
            text-decoration: none;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: var(--shadow);
        }
        
        .btn:hover {
            background: var(--secondary-color);
            transform: translateY(-2px);
        }
        
        .btn-outline {
            background: transparent;
            border: 2px solid var(--text-light);
            margin-left: 15px;
        }
        
        .btn-outline:hover {
            background: var(--text-light);
            color: var(--dark-color);
        }
        
        /* 美化登录按钮 */
        .btn-login {
            background: var(--primary-color);
            color: var(--text-light);
            padding: 10px 20px;
            border-radius: 20px;
            font-size: 16px;
            font-weight: 600;
            text-decoration: none;
            transition: var(--transition);
            box-shadow: var(--shadow);
        }

        .btn-login:hover {
            background: var(--secondary-color);
            transform: translateY(-2px);
        }
        
        /* 登录框 */
        .login-box {
            position: relative; /* 确保登录容器有定位上下文 */
    z-index: 10; /* 提高登录容器的层级，使其覆盖特色栏 */
            background: rgba(255, 255, 255, 0.95);
            padding: 40px;
            border-radius: 8px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            width: 400px;
            transform: translateY(0);
            transition: var(--transition);
        }
        
        .login-box:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
        }
        
        .login-box h2 {
            text-align: center;
            margin-bottom: 30px;
            color: var(--dark-color);
            font-size: 24px;
        }
        
        .form-group {
            margin-bottom: 20px;
        }
        
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-size: 14px;
            color: var(--dark-color);
            font-weight: 500;
        }
        
        .form-group input {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 14px;
            transition: var(--transition);
        }
        
        .form-group input:focus {
            border-color: var(--primary-color);
            outline: none;
            box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
        }
        
        .form-group button {
            width: 100%;
            padding: 12px;
            background: var(--primary-color);
            color: var(--text-light);
            border: none;
            border-radius: 4px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        
        .form-group button:hover {
            background: var(--secondary-color);
        }
        
        .form-footer {
            text-align: center;
            margin-top: 20px;
            font-size: 14px;
        }
        
        .form-footer a {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 500;
        }
        
        .form-footer a:hover {
            text-decoration: underline;
        }
        
        /* 特色区域 */
        .features {
            position: absolute;
            bottom: 20px;
            left: 0;
            width: 100%;
            z-index: 1; /* 降低特色栏的层级 */
        }
        
        .features-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        .features-list {
            display: flex;
            justify-content: space-between;
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(10px);
            border-radius: 8px;
            padding: 20px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        
        .feature-item {
            display: flex;
            align-items: center;
            color: #161313;
            padding: 0 20px;
        }
        
        .feature-item i {
            font-size: 24px;
            margin-right: 15px;
            color: var(--primary-color);
        }
        
        .feature-item span {
            font-size: 16px;
            font-weight: 500;
        }
        
        /* 内容区域 */
        .section {
            padding: 100px 0;
            background: var(--text-light);
        }
        
        .section-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 60px;
        }
        
        .section-title h2 {
            font-size: 36px;
            color: #222121;
            margin-bottom: 15px;
            position: relative;
            display: inline-block;
        }
        
        .section-title h2::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 3px;
            background: var(--primary-color);
        }
        
        .section-title p {
            font-size: 18px;
            color: #424242;
            max-width: 700px;
            margin: 0 auto;
        }
        
        /* 智产板块 */
        .zhichan-section {
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        
        .zhichan-cards {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            width: 100%;
        }
        
        .zhichan-card {
            background: var(--text-light);
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: var(--transition);
        }
        
        .zhichan-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        
        .zhichan-card-img {
            height: 200px;
            overflow: hidden;
        }
        
        .zhichan-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        
        .zhichan-card:hover .zhichan-card-img img {
            transform: scale(1.1);
        }
        
        .zhichan-card-content {
            padding: 25px;
        }
        
        .zhichan-card-content h3 {
            font-size: 20px;
            margin-bottom: 15px;
            color: var(--dark-color);
        }
        
        .zhichan-card-content p {
            color: #666;
            margin-bottom: 20px;
        }
        
        /* 智销板块 */
        .zhixiao-section {
            background: #f9f9f9;
        }
        
        .zhixiao-content {
            display: flex;
            align-items: center;
            gap: 50px;
        }
        
        .zhixiao-img {
            flex: 1;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        
        .zhixiao-img img {
            width: 100%;
            height: auto;
            display: block;
        }
        
        .zhixiao-text {
            flex: 1;
        }
        
        .zhixiao-text h3 {
            font-size: 28px;
            margin-bottom: 20px;
            color: var(--dark-color);
        }
        
        .zhixiao-text ul {
            margin-bottom: 30px;
            list-style: none;
        }
        
        .zhixiao-text ul li {
            margin-bottom: 15px;
            position: relative;
            padding-left: 30px;
        }
        
        .zhixiao-text ul li::before {
            content: '\f00c';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            position: absolute;
            left: 0;
            top: 2px;
            color: var(--primary-color);
        }
        
        /* 智管板块 */
        .zhiguan-section .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        
        .feature-box {
            text-align: center;
            padding: 40px 30px;
            background: #f9f9f9;
            border-radius: 8px;
            transition: var(--transition);
        }
        
        .feature-box:hover {
            background: var(--primary-color);
            color: var(--text-light);
            transform: translateY(-10px);
        }
        
        .feature-box:hover h3,
        .feature-box:hover p,
        .feature-box:hover i {
            color: var(--text-light);
        }
        
        .feature-box i {
            font-size: 40px;
            color: var(--primary-color);
            margin-bottom: 20px;
            transition: var(--transition);
        }
        
        .feature-box h3 {
            font-size: 20px;
            margin-bottom: 15px;
            color: var(--dark-color);
            transition: var(--transition);
        }
        
        .feature-box p {
            color: #666;
            transition: var(--transition);
        }
        
        /* 联系我们 */
        .contact-section {
            background: var(--dark-color);
            color: var(--text-light);
        }
        
        .contact-container {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 50px;
        }
        
        .contact-info h3 {
            font-size: 24px;
            margin-bottom: 30px;
        }
        
        .contact-info p {
            margin-bottom: 20px;
            opacity: 0.9;
        }
        
        .contact-info ul {
            list-style: none;
            margin-top: 30px;
        }
        
        .contact-info ul li {
            margin-bottom: 15px;
            display: flex;
            align-items: center;
        }
        
        .contact-info ul li i {
            margin-right: 15px;
            color: var(--primary-color);
            font-size: 20px;
            width: 20px;
        }
        
        .contact-form .form-group {
            margin-bottom: 20px;
        }
        
        .contact-form input,
        .contact-form textarea {
            width: 100%;
            padding: 12px 15px;
            border: none;
            border-radius: 4px;
            background: rgba(255, 255, 255, 0.1);
            color: var(--text-light);
            font-size: 14px;
            transition: var(--transition);
        }
        
        .contact-form textarea {
            min-height: 150px;
            resize: vertical;
        }
        
        .contact-form input:focus,
        .contact-form textarea:focus {
            background: rgba(255, 255, 255, 0.2);
            outline: none;
        }
        
        .contact-form button {
            background: var(--primary-color);
            color: var(--text-light);
            border: none;
            padding: 12px 30px;
            border-radius: 4px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        
        .contact-form button:hover {
            background: var(--secondary-color);
        }
        
        /* 页脚 */
        .footer {
            background: #222;
            color: var(--text-light);
            padding: 50px 0 20px;
            text-align: center;
        }
        
        .footer-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        .footer-links {
            display: flex;
            justify-content: center;
            margin-bottom: 30px;
        }
        
        .footer-links a {
            color: var(--text-light);
            margin: 0 15px;
            text-decoration: none;
            transition: var(--transition);
        }
        
        .footer-links a:hover {
            color: var(--primary-color);
        }
        
        .social-links {
            margin-bottom: 30px;
        }
        
        .social-links a {
            display: inline-block;
            width: 40px;
            height: 40px;
            line-height: 40px;
            background: rgba(255, 255, 255, 0.1);
            color: var(--text-light);
            border-radius: 50%;
            margin: 0 10px;
            transition: var(--transition);
        }
        
        .social-links a:hover {
            background: var(--primary-color);
            transform: translateY(-5px);
        }
        
        .copyright {
            opacity: 0.7;
            font-size: 14px;
        }
        
        /* 响应式设计 */
        @media (max-width: 992px) {
            .hero-container {
                flex-direction: column;
                text-align: center;
            }
            
            .hero-content {
                margin-bottom: 50px;
                max-width: 100%;
            }
            
            .login-box {
                width: 100%;
                max-width: 500px;
            }
            
            .features-list {
                flex-wrap: wrap;
                justify-content: center;
            }
            
            .feature-item {
                margin: 10px;
            }
            
            .zhixiao-content {
                flex-direction: column;
            }
            
            .contact-container {
                grid-template-columns: 1fr;
            }
            
            .zhiguan-section .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        
        @media (max-width: 768px) {
            .header-container {
                flex-direction: column;
            }
            
            .logo {
                margin-bottom: 15px;
            }
            
            .nav {
                flex-wrap: wrap;
                justify-content: center;
                gap: 15px;
            }
            
            .hero-content h1 {
                font-size: 36px;
            }
            
            .zhichan-cards {
                grid-template-columns: 1fr;
            }
            
            .zhiguan-section .features-grid {
                grid-template-columns: 1fr;
            }
            
            /* 删除或注释掉下面这段 */
            /*
            .features {
                position: static;
                margin-top: 50px;
            }
            */
            /* 保持底部定位 */
            .features {
                position: absolute;
                bottom: 20px;
                left: 0;
                width: 100%;
                margin-top: 0;
            }
        }
        
        /* 动画 */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .animate {
            animation: fadeInUp 1s ease forwards;
        }
        
        .delay-1 {
            animation-delay: 0.2s;
        }
        
        .delay-2 {
            animation-delay: 0.4s;
        }
        
        .delay-3 {
            animation-delay: 0.6s;
        }
        
        .delay-4 {
            animation-delay: 0.8s;
        }