:root {
            --primary: #2c3e50;
            --secondary: #3498db;
            --accent: #e74c3c;
            --light: #ecf0f1;
            --dark: #2c3e50;
            --success: #2ecc71;
            --warning: #f39c12;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --radius: 8px;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background-color: #f8f9fa;
            color: #333;
            line-height: 1.6;
        }
        
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 头部样式 */
        header {
            background: linear-gradient(135deg, var(--primary) 0%, var(--dark) 100%);
            color: white;
            padding: 15px 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .logo i {
            font-size: 28px;
            color: var(--secondary);
        }
        
        .logo h1 {
            font-size: 24px;
            font-weight: 700;
        }
        
        .nav-links {
            display: flex;
            gap: 25px;
        }
        
        .nav-links a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s;
        }
        
        .nav-links a:hover {
            color: var(--secondary);
        }
        
        .contact-buttons {
            display: flex;
            gap: 15px;
        }
        
        .btn {
            padding: 10px 20px;
            border-radius: var(--radius);
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            border: none;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .btn-primary {
            background-color: var(--secondary);
            color: white;
        }
        
        .btn-primary:hover {
            background-color: #2980b9;
            transform: translateY(-2px);
        }
        
        .btn-outline {
            background-color: transparent;
            color: white;
            border: 2px solid white;
        }
        
        .btn-outline:hover {
            background-color: white;
            color: var(--primary);
        }
        
        /* Banner样式 */
        .banner {
            background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1554224155-6726b3ff858f?ixlib=rb-4.0.3&auto=format&fit=crop&w=1200&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 100px 0;
            text-align: center;
        }
        
        .banner-content {
            max-width: 800px;
            margin: 0 auto;
        }
        
        .banner h2 {
            font-size: 42px;
            margin-bottom: 20px;
            line-height: 1.2;
        }
        
        .banner p {
            font-size: 18px;
            margin-bottom: 30px;
            opacity: 0.9;
        }
        
        .banner-buttons {
            display: flex;
            justify-content: center;
            gap: 15px;
            flex-wrap: wrap;
        }
        
        .btn-accent {
            background-color: var(--accent);
            color: white;
        }
        
        .btn-accent:hover {
            background-color: #c0392b;
            transform: translateY(-2px);
        }
        
        /* 服务介绍样式 */
        .services {
            padding: 80px 0;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 50px;
        }
        
        .section-title h2 {
            font-size: 36px;
            color: var(--primary);
            margin-bottom: 15px;
        }
        
        .section-title p {
            color: #7f8c8d;
            max-width: 600px;
            margin: 0 auto;
        }
        
        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
        }
        
        .service-card {
            background-color: white;
            border-radius: var(--radius);
            padding: 30px;
            box-shadow: var(--shadow);
            transition: all 0.3s ease;
            text-align: center;
        }
        
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
        }
        
        .service-icon {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, var(--secondary), var(--primary));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            color: white;
            font-size: 32px;
        }
        
        .service-card h3 {
            margin-bottom: 15px;
            color: var(--primary);
        }
        
        .service-card p {
            color: #7f8c8d;
            margin-bottom: 20px;
        }
        
        /* 聊天界面样式 */
        .chat-section {
            padding: 80px 0;
            background-color: #f1f2f6;
        }
        
        .chat-container {
            max-width: 900px;
            margin: 0 auto;
            background-color: white;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            overflow: hidden;
        }
        
        .chat-header {
            background: linear-gradient(135deg, var(--primary) 0%, var(--dark) 100%);
            color: white;
            padding: 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        
        .chat-title {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .chat-title i {
            font-size: 24px;
        }
        
        .chat-status {
            display: flex;
            align-items: center;
            gap: 5px;
            font-size: 14px;
        }
        
        .status-indicator {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background-color: var(--success);
        }
        
        .chat-messages {
            height: 400px;
            padding: 20px;
            overflow-y: auto;
            background-color: #f8f9fa;
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        
        .message {
            max-width: 80%;
            padding: 12px 16px;
            border-radius: 18px;
            font-size: 14px;
            line-height: 1.4;
            position: relative;
        }
        
        .bot-message {
            align-self: flex-start;
            background-color: white;
            border: 1px solid #e1e1e1;
            border-top-left-radius: 5px;
        }
        
        .user-message {
            align-self: flex-end;
            background-color: var(--secondary);
            color: white;
            border-top-right-radius: 5px;
        }
        
        .message-time {
            font-size: 11px;
            opacity: 0.7;
            margin-top: 5px;
        }
        
        .chat-input-area {
            display: flex;
            padding: 15px;
            border-top: 1px solid #eee;
            background-color: white;
        }
        
        .chat-input {
            flex: 1;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 30px;
            outline: none;
            font-size: 14px;
        }
        
        .send-btn {
            background-color: var(--secondary);
            color: white;
            border: none;
            width: 45px;
            height: 45px;
            border-radius: 50%;
            margin-left: 10px;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        
        .send-btn:hover {
            background-color: #2980b9;
            transform: scale(1.05);
        }
        
        .quick-actions {
            padding: 15px 20px;
            background-color: #f8f9fa;
            border-top: 1px solid #eee;
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        
        .action-btn {
            background-color: white;
            border: 1px solid #ddd;
            border-radius: 20px;
            padding: 8px 15px;
            font-size: 13px;
            cursor: pointer;
            transition: all 0.2s ease;
            display: flex;
            align-items: center;
            gap: 5px;
        }
        
        .action-btn:hover {
            background-color: #f1f1f1;
            border-color: var(--secondary);
        }
        
        /* 联系信息样式 */
        .contact-section {
            padding: 80px 0;
            background: linear-gradient(135deg, var(--primary) 0%, var(--dark) 100%);
            color: white;
        }
        
        .contact-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 40px;
        }
        
        .contact-info {
            display: flex;
            flex-direction: column;
            gap: 25px;
        }
        
        .contact-item {
            display: flex;
            align-items: center;
            gap: 15px;
        }
        
        .contact-icon {
            width: 50px;
            height: 50px;
            background-color: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
        }
        
        .contact-details h3 {
            margin-bottom: 5px;
        }
        
        .contact-details p {
            opacity: 0.8;
        }
        
        .qr-code {
            text-align: center;
        }
        
        .qr-code img {
            max-width: 200px;
            border-radius: var(--radius);
            margin-bottom: 15px;
        }
        
        /* 底部样式 */
        footer {
            background-color: #1a2530;
            color: #bdc3c7;
            padding: 50px 0 20px;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 30px;
            margin-bottom: 30px;
        }
        
        .footer-column h4 {
            color: white;
            margin-bottom: 20px;
            font-size: 18px;
            position: relative;
            padding-bottom: 10px;
        }
        
        .footer-column h4::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 40px;
            height: 2px;
            background-color: var(--secondary);
        }
        
        .footer-column ul {
            list-style: none;
        }
        
        .footer-column ul li {
            margin-bottom: 10px;
        }
        
        .footer-column ul li a {
            color: #bdc3c7;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-column ul li a:hover {
            color: var(--secondary);
        }
        
        .social-links {
            display: flex;
            gap: 15px;
            margin-top: 15px;
        }
        
        .social-links a {
            width: 36px;
            height: 36px;
            background-color: #2c3e50;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            text-decoration: none;
            transition: all 0.3s;
        }
        
        .social-links a:hover {
            background-color: var(--secondary);
            transform: translateY(-3px);
        }
        
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #34495e;
            font-size: 14px;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
                gap: 15px;
            }
            
            .nav-links {
                gap: 15px;
            }
            
            .banner h2 {
                font-size: 32px;
            }
            
            .banner-buttons {
                flex-direction: column;
                align-items: center;
            }
            
            .btn {
                width: 100%;
                justify-content: center;
            }
            
            .message {
                max-width: 90%;
            }
        }