body { font-family: sans-serif; background-color: #f4f4f9; }
#app { padding: 20px; }
.chat-window { max-width: 700px; margin: auto; padding: 20px; border-radius: 10px; border: 1px solid #ccc; background: white; }
.message { padding: 12px; margin: 10px 0; border-radius: 8px; }
.message.ai { background: #e9ecef; }
.message.user { background: #007bff; color: white; text-align: right; }