body {
  background-color: #f8f9fa;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.tab-content {
  background: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.message {
  margin: 10px 0;
  padding: 10px;
  border-radius: 8px;
}

.user-message {
  background-color: #d1ecf1;
  margin-left: 20%;
}

.bot-message {
  background-color: #d4edda;
  margin-right: 20%;
}

.system-message {
  background-color: #e9ecef;
  font-size: 0.85em;
  color: #6c757d;
}

.dialog-item {
  cursor: pointer;
  transition: background-color 0.2s;
}

.dialog-item:hover {
  background-color: #f1f3f5;
}

.dialog-item.active {
  background-color: #e9ecef;
  border-left: 4px solid #0d6efd;
}