Modern Chat Interface

.chat-container {
  max-width: 400px;
  height: 600px;
  margin: 2rem auto;
  background: #fff;
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.chat-header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 0.9rem;
}

.user-details h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

.status {
  font-size: 0.8rem;
  opacity: 0.9;
}

.status.online::before {
  content: '●';
  color: #4ade80;
  margin-right: 0.25rem;
}

.chat-actions {
  display: flex;
  gap: 0.5rem;
}

.action-btn {
  background: rgba(255, 255, 255, 0.2);
  border: none;
  border-radius: 50%;
  width: 35px;
  height: 35px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.2s ease;
}

.action-btn:hover {
  background: rgba(255, 255, 255, 0.3);
}

.chat-messages {
  flex: 1;
  padding: 1rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  background: #f8fafc;
}

.message {
  display: flex;
  gap: 0.5rem;
  max-width: 80%;
}

.message.sent {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.message-avatar {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 0.7rem;
  font-weight: bold;
  flex-shrink: 0;
}

.message-content {
  background: white;
  padding: 0.75rem 1rem;
  border-radius: 18px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  position: relative;
}

.message.sent .message-content {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.message-content p {
  margin: 0;
  line-height: 1.4;
  font-size: 0.9rem;
}

.message-time {
  font-size: 0.7rem;
  opacity: 0.7;
  margin-top: 0.25rem;
  display: block;
}

.chat-input-container {
  padding: 1rem;
  background: white;
  border-top: 1px solid #e2e8f0;
}

.chat-input {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: #f1f5f9;
  border-radius: 25px;
  padding: 0.5rem 1rem;
}

.chat-input input {
  flex: 1;
  border: none;
  background: transparent;
  outline: none;
  font-size: 0.9rem;
  padding: 0.5rem 0;
}

.chat-input input::placeholder {
  color: #94a3b8;
}

.emoji-btn, .attach-btn, .send-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 50%;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease;
}

.emoji-btn:hover, .attach-btn:hover {
  background: rgba(0, 0, 0, 0.05);
}

.send-btn {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.send-btn:hover {
  transform: scale(1.05);
}

.chat-messages::-webkit-scrollbar {
  width: 4px;
}

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

.chat-messages::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 2px;
}

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

.message {
  animation: messageSlideIn 0.3s ease;
}

document.addEventListener('DOMContentLoaded', function() {
  const messageInput = document.getElementById('messageInput');
  const sendBtn = document.getElementById('sendBtn');
  const chatMessages = document.getElementById('chatMessages');
  
  function addMessage(text, isSent = true) {
    const messageDiv = document.createElement('div');
    messageDiv.className = `message ${isSent ? 'sent' : 'received'}`;
    
    const currentTime = new Date().toLocaleTimeString([], {hour: '2-digit', minute:'2-digit'});
    
    messageDiv.innerHTML = `
      ${!isSent ? '<div class="message-avatar">AI</div>' : ''}
      <div class="message-content">
        <p>${text}</p>
        <span class="message-time">${currentTime}</span>
      </div>
    `;
    
    chatMessages.appendChild(messageDiv);
    chatMessages.scrollTop = chatMessages.scrollHeight;
  }
  
  function sendMessage() {
    const text = messageInput.value.trim();
    if (text) {
      addMessage(text, true);
      messageInput.value = '';
      
      // Simulate AI response
      setTimeout(() => {
        const responses = [
          "That's interesting! Tell me more.",
          "I understand. How can I help with that?",
          "Great question! Let me think about that.",
          "I see what you mean. Here's what I think...",
          "Thanks for sharing that with me!"
        ];
        const randomResponse = responses[Math.floor(Math.random() * responses.length)];
        addMessage(randomResponse, false);
      }, 1000 + Math.random() * 2000);
    }
  }
  
  sendBtn.addEventListener('click', sendMessage);
  
  messageInput.addEventListener('keypress', function(e) {
    if (e.key === 'Enter') {
      sendMessage();
    }
  });
  
  // Auto-focus input
  messageInput.focus();
})