#main-container {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            max-width: 800px;
            margin: 0 auto;
            padding: 20px;
            background-color: #f8f9fa;
        }
        
        .chat-container {
            background-color: white;
            border-radius: 12px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            overflow: hidden;
            height: 90vh;
            display: flex;
            flex-direction: column;
        }
        
        .chat-header {
            background-color: #2c7873;
            color: white;
            padding: 20px;
            text-align: center;
        }
        
        .chat-messages {
            flex: 1;
            overflow-y: auto;
            padding: 20px;
            background-color: #f1f3f5;
        }
        
        .message {
            margin-bottom: 15px;
            padding: 12px 16px;
            border-radius: 18px;
            max-width: 75%;
            word-wrap: break-word;
            animation: fadeIn 0.3s ease;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .user-message {
            background-color: #e3f2fd;
            margin-left: auto;
            border-bottom-right-radius: 5px;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }
        
        .bot-message {
            background-color: #ffffff;
            margin-right: auto;
            border-bottom-left-radius: 5px;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
            border: 1px solid #e9ecef;
        }
        
        .source {
            font-size: 0.8em;
            color: #6c757d;
            margin-top: 8px;
            font-style: italic;
            border-top: 1px dashed #dee2e6;
            padding-top: 5px;
        }
        
        .chat-input-container {
            padding: 15px;
            background-color: white;
            border-top: 1px solid #e9ecef;
            display: flex;
            align-items: center;
        }
        
        #user-input {
            flex: 1;
            padding: 12px 15px;
            border: 1px solid #ced4da;
            border-radius: 20px;
            outline: none;
            font-size: 16px;
            transition: border-color 0.3s;
        }
        
        #user-input:focus {
            border-color: #2c7873;
        }
        
        #send-btn {
            background-color: #2c7873;
            color: white;
            border: none;
            border-radius: 20px;
            padding: 12px 20px;
            margin-left: 10px;
            cursor: pointer;
            font-size: 16px;
            transition: background-color 0.3s;
        }
        
        #send-btn:hover {
            background-color: #235f5b;
        }
        
        .typing-indicator {
            display: none;
            padding: 10px 15px;
            color: #6c757d;
            font-style: italic;
            background-color: #f8f9fa;
            border-radius: 18px;
            margin-bottom: 15px;
            width: fit-content;
        }
        
        .typing-indicator.active {
            display: block;
            animation: pulse 1.5s infinite;
        }
        
        @keyframes pulse {
            0%, 100% { opacity: 0.6; }
            50% { opacity: 1; }
        }