.chat-container {
    max-width: 600px;
    height: 80vh;
    margin: 2rem auto;
    display: flex;
    flex-direction: column;
    border: 1px solid #ccc;
    border-radius: 8px;
    overflow: hidden;
  }
  .messages {
    flex: 1;
    padding: 1rem;
    background: #f5f5f5;
    overflow-y: auto;
  }
  .message {
    margin: .5rem 0;
    padding: .75rem 1rem;
    border-radius: 16px;
    max-width: 80%;
  }
  .message.user { background: #d1e7dd; align-self: flex-end; }
  .message.bot  { background: #e2e3e5; align-self: flex-start; }
  .input-area {
    display: flex;
    padding: .5rem;
    border-top: 1px solid #ccc;
  }
  #chat-input {
    flex: 1;
    padding: .5rem;
    border: 1px solid #ccc;
    border-radius: 4px;
  }
  #send-btn {
    margin-left: .5rem;
    padding: .5rem 1rem;
    background: #43a2ca;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
  }
  .option-btn {
    margin: .25rem;
    padding: .5rem 1rem;
    background: #6c757d;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
  }
  .option-btn:hover { opacity: .9; }