#topbar {
  display: flex;
  gap: 10px;
  padding: 10px;
  justify-content: center;
  margin-bottom: 20px;
}

#topbar button {
  background: #333;
  color: #eee;
  border: 1px solid #555;
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  transition: background 0.2s;
}

#topbar button:hover {
  background: #444;
}

#topbar button.active {
  background: #0078ff;
  border-color: #005fcc;
}