chatbot using Html Css and Javascript source code

 <div class="chat-container">
        <div class="chat-header">
            <div class="bot-avatar">🤖</div>
            <div class="header-info">
                <h2>AI Assistant</h2>
                <p>Online • Always ready to help</p>
            </div>
        </div>

        <div class="chat-messages" id="chatMessages">
            <div class="message bot">
                <div class="message-avatar">🤖</div>
                <div>
                    <div class="message-content">
                        Hello! I'm your AI assistant. How can I help you today?
                    </div>
                    <div class="message-time" id="initialTime"></div>
                </div>
            </div>
        </div>

        <div class="chat-input-container">
            <div class="quick-replies">
                <button class="quick-reply-btn" onclick="sendQuickReply('Tell me a joke')">Tell me a joke 😄</button>
                <button class="quick-reply-btn" onclick="sendQuickReply('What can you do?')">What can you do? 🤔</button>
                <button class="quick-reply-btn" onclick="sendQuickReply('Help me')">Help me 💡</button>
            </div>
            <div class="chat-input-wrapper">
                <input type="text" class="chat-input" id="userInput" placeholder="Type your message..." onkeypress="handleKeyPress(event)">
                <button class="send-button" id="sendBtn" onclick="sendMessage()">➤</button>
            </div>
        </div>
    </div>

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            background: linear-gradient(135deg, #ee0979 0%, #ff6a00 100%);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
        }

        .chat-container {
            background: white;
            border-radius: 20px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
            width: 100%;
            max-width: 800px;
            height: 600px;
            display: flex;
            flex-direction: column;
            overflow: hidden;
        }

        .chat-header {
            background: linear-gradient(135deg, #ee0979 0%, #ff6a00 100%);
            color: white;
            padding: 20px 24px;
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .bot-avatar {
            width: 50px;
            height: 50px;
            background: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
        }

        .header-info h2 {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 2px;
        }

        .header-info p {
            font-size: 13px;
            opacity: 0.9;
        }

        .chat-messages {
            flex: 1;
            overflow-y: auto;
            padding: 24px;
            background: #f8f9fa;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .chat-messages::-webkit-scrollbar {
            width: 6px;
        }

        .chat-messages::-webkit-scrollbar-track {
            background: #f1f1f1;
        }

        .chat-messages::-webkit-scrollbar-thumb {
            background: #ee0979;
            border-radius: 3px;
        }

        .message {
            display: flex;
            gap: 12px;
            animation: fadeIn 0.3s ease-in;
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .message.user {
            flex-direction: row-reverse;
        }

        .message-avatar {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            flex-shrink: 0;
        }

        .bot .message-avatar {
            background: linear-gradient(135deg, #ee0979 0%, #ff6a00 100%);
            color: white;
        }

        .user .message-avatar {
            background: #6c757d;
            color: white;
        }

        .message-content {
            max-width: 70%;
            padding: 12px 16px;
            border-radius: 12px;
            line-height: 1.5;
            font-size: 15px;
        }

        .bot .message-content {
            background: white;
            color: #2d3748;
            border: 1px solid #e9ecef;
        }

        .user .message-content {
            background: linear-gradient(135deg, #ee0979 0%, #ff6a00 100%);
            color: white;
        }

        .message-time {
            font-size: 11px;
            opacity: 0.6;
            margin-top: 4px;
        }

        .typing-indicator {
            display: none;
            gap: 4px;
            padding: 12px 16px;
        }

        .typing-indicator.active {
            display: flex;
        }

        .typing-dot {
            width: 8px;
            height: 8px;
            background: #6c757d;
            border-radius: 50%;
            animation: typing 1.4s infinite;
        }

        .typing-dot:nth-child(2) {
            animation-delay: 0.2s;
        }

        .typing-dot:nth-child(3) {
            animation-delay: 0.4s;
        }

        @keyframes typing {
            0%, 60%, 100% {
                transform: translateY(0);
                opacity: 0.7;
            }
            30% {
                transform: translateY(-10px);
                opacity: 1;
            }
        }

        .chat-input-container {
            padding: 20px 24px;
            background: white;
            border-top: 1px solid #e9ecef;
        }

        .chat-input-wrapper {
            display: flex;
            gap: 12px;
            align-items: center;
        }

        .chat-input {
            flex: 1;
            padding: 12px 16px;
            border: 2px solid #e9ecef;
            border-radius: 24px;
            font-size: 15px;
            outline: none;
            transition: all 0.3s;
        }

        .chat-input:focus {
            border-color: #ee0979;
        }

        .send-button {
            width: 48px;
            height: 48px;
            background: linear-gradient(135deg, #ee0979 0%, #ff6a00 100%);
            border: none;
            border-radius: 50%;
            color: white;
            font-size: 20px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.3s;
            box-shadow: 0 4px 12px rgba(238, 9, 121, 0.3);
        }

        .send-button:hover {
            transform: scale(1.05);
            box-shadow: 0 6px 16px rgba(238, 9, 121, 0.4);
        }

        .send-button:active {
            transform: scale(0.95);
        }

        .send-button:disabled {
            opacity: 0.5;
            cursor: not-allowed;
            transform: scale(1);
        }

        .quick-replies {
            display: flex;
            gap: 8px;
            margin-top: 12px;
            flex-wrap: wrap;
        }

        .quick-reply-btn {
            padding: 8px 16px;
            background: white;
            border: 1px solid #ee0979;
            color: #ee0979;
            border-radius: 20px;
            font-size: 13px;
            cursor: pointer;
            transition: all 0.3s;
        }

        .quick-reply-btn:hover {
            background: linear-gradient(135deg, #ee0979 0%, #ff6a00 100%);
            color: white;
            transform: translateY(-2px);
        }

   const chatMessages = document.getElementById('chatMessages');
        const userInput = document.getElementById('userInput');
        const sendBtn = document.getElementById('sendBtn');

        // Predefined responses for the chatbot
        const responses = {
            'hello': 'Hi there! How can I assist you today?',
            'hi': 'Hello! What would you like to know?',
            'how are you': 'I\'m doing great, thank you for asking! How can I help you?',
            'what can you do': 'I can answer questions, provide information, tell jokes, and have conversations with you!',
            'tell me a joke': 'Why don\'t scientists trust atoms? Because they make up everything! 😄',
            'joke': 'What do you call a bear with no teeth? A gummy bear! 🐻',
            'help': 'I\'m here to help! You can ask me questions, request information, or just chat. What do you need?',
            'bye': 'Goodbye! Have a wonderful day! Feel free to come back anytime.',
            'thank you': 'You\'re welcome! Is there anything else I can help you with?',
            'thanks': 'My pleasure! Let me know if you need anything else.',
            'weather': 'I don\'t have access to real-time weather data, but you can check your local weather service for accurate information!',
            'time': `The current time is ${new Date().toLocaleTimeString()}.`,
            'date': `Today is ${new Date().toLocaleDateString()}.`,
            'name': 'I\'m your AI Assistant! You can call me Bot. What\'s your name?',
            'who are you': 'I\'m an AI chatbot created to assist and chat with you!',
            'default': 'I understand you said: "[USER_INPUT]". I\'m still learning! Can you rephrase that or ask something else?'
        };

        // Initialize with current time
        document.getElementById('initialTime').textContent = getCurrentTime();

        function getCurrentTime() {
            return new Date().toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' });
        }

        function sendMessage() {
            const message = userInput.value.trim();
            if (message === '') return;

            addMessage(message, 'user');
            userInput.value = '';
            
            showTypingIndicator();
            
            setTimeout(() => {
                hideTypingIndicator();
                const response = getBotResponse(message);
                addMessage(response, 'bot');
            }, 1000 + Math.random() * 1000);
        }

        function sendQuickReply(message) {
            addMessage(message, 'user');
            showTypingIndicator();
            
            setTimeout(() => {
                hideTypingIndicator();
                const response = getBotResponse(message);
                addMessage(response, 'bot');
            }, 1000);
        }

        function addMessage(text, sender) {
            const messageDiv = document.createElement('div');
            messageDiv.className = `message ${sender}`;
            
            const avatar = document.createElement('div');
            avatar.className = 'message-avatar';
            avatar.textContent = sender === 'bot' ? '🤖' : '👤';
            
            const contentWrapper = document.createElement('div');
            const content = document.createElement('div');
            content.className = 'message-content';
            content.textContent = text;
            
            const time = document.createElement('div');
            time.className = 'message-time';
            time.textContent = getCurrentTime();
            
            contentWrapper.appendChild(content);
            contentWrapper.appendChild(time);
            messageDiv.appendChild(avatar);
            messageDiv.appendChild(contentWrapper);
            
            chatMessages.appendChild(messageDiv);
            chatMessages.scrollTop = chatMessages.scrollHeight;
        }

        function showTypingIndicator() {
            const typingDiv = document.createElement('div');
            typingDiv.className = 'message bot';
            typingDiv.id = 'typingIndicator';
            
            const avatar = document.createElement('div');
            avatar.className = 'message-avatar';
            avatar.textContent = '🤖';
            
            const indicator = document.createElement('div');
            indicator.className = 'typing-indicator active';
            indicator.innerHTML = '<div class="typing-dot"></div><div class="typing-dot"></div><div class="typing-dot"></div>';
            
            typingDiv.appendChild(avatar);
            typingDiv.appendChild(indicator);
            chatMessages.appendChild(typingDiv);
            chatMessages.scrollTop = chatMessages.scrollHeight;
        }

        function hideTypingIndicator() {
            const indicator = document.getElementById('typingIndicator');
            if (indicator) {
                indicator.remove();
            }
        }

        function getBotResponse(userMessage) {
            const message = userMessage.toLowerCase();
            
            for (let key in responses) {
                if (message.includes(key)) {
                    return responses[key];
                }
            }
            
            return responses['default'].replace('[USER_INPUT]', userMessage);
        }

        function handleKeyPress(event) {
            if (event.key === 'Enter') {
                sendMessage();
            }
        }

        userInput.focus();