body {
  margin: 0;
  background: #e0f7fa;
  font-family: Arial, sans-serif;
  user-select: none;
}
#ui {
  background: #006064;
  color: white;
  padding: 8px 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
#stats span {
  margin-right: 20px;
  font-weight: bold;
  font-size: 16px;
}
#buttons button {
  margin-left: 10px;
  padding: 6px 12px;
  font-weight: bold;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  background-color: #00838f;
  color: white;
  transition: background-color 0.3s;
}
#buttons button:hover {
  background-color: #004d40;
}
#gameCanvas {
  display: block;
  margin: 0 auto;
  background: #a7d7f9;
  border: 3px solid #004d40;
  margin-top: 8px;
}