body{
  font-family: Arial, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background-color: #f0f0f0;
  margin: 0;
  padding: 20px;
  box-sizing: border-box;
}
.container {
  text-align: center;
  max-width: 800px;
  width: 100%;
}
.controls { margin-bottom: 20px; }
button {
  padding: 10px 20px;
  font-size: 16px;
  cursor: pointer;
  background-color: #007bff;
  color: white;
  border: none;
  border-radius: 5px;
  margin: 5px;
}
button:hover { background-color: #0056b3; }
button:disabled {
  background-color: #6c757d;
  cursor: not-allowed;
}
#status {
  margin: 10px 0;
  font-weight: bold;
}
.chat-container {
  background: white;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  max-height: 500px;
  overflow-y: auto;
  margin-top: 20px;
  padding: 20px;
  text-align: left;
}
.message {
  margin-bottom: 15px;
  padding: 10px 15px;
  border-radius: 15px;
  max-width: 80%;
  word-wrap: break-word;
}
.user-message {
  background-color: #007bff;
  color: white;
  margin-left: auto;
  text-align: right;
}
.ai-message {
  background-color: #e9ecef;
  color: #333;
  margin-right: auto;
  text-align: left;
}
.message-label {
  font-size: 12px;
  opacity: 0.7;
  margin-bottom: 5px;
  font-weight: bold;
}
.message-content { font-size: 14px; line-height: 1.4; }
.typing-indicator {
  display: none;
  background-color: #e9ecef;
  color: #666;
  margin-right: auto;
  font-style: italic;
  animation: pulse 1.5s infinite;
}
@keyframes pulse { 0%,50%,100%{opacity:1} 25%,75%{opacity:.5} }
.clear-chat { background-color: #dc3545; font-size: 12px; padding: 5px 10px; }
.clear-chat:hover { background-color: #c82333; }