body { font-family: 'Segoe UI', sans-serif; background-color: #f8f9fa; }
    #chat-button {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background-color: #007bff;
      color: white;
      border: none;
      padding: 12px 24px;
      border-radius: 30px;
      cursor: pointer;
      box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    }
    #chat-container {
      display: none;
      position: fixed;
      bottom: 80px;
      right: 20px;
      width: 100%;
      max-width: 400px;
      max-height: 80%;
      background: white;
      border-radius: 15px;
      overflow-y: auto;
      box-shadow: 0 6px 12px rgba(0,0,0,0.2);
      padding: 20px;
      z-index: 1000;
    }
    .chat-message { margin-bottom: 15px; }
    .chat-input, .btn { width: 100%; margin-top: 5px; }
    @media (max-width: 480px) {
      #chat-container {
        right: 10px;
        left: 10px;
        width: auto;
      }
    }