body {
  margin: 0;
  background: #222;
  color: white;
  font-family: Arial, sans-serif;
  text-align: center;
}

.hidden {
  display: none;
}

#startScreen {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

#startBtn {
  font-size: 28px;
  padding: 15px 30px;
  border-radius: 12px;
  border: none;
  background: limegreen;
  color: white;
  cursor: pointer;
}

#gameContainer {
  max-width: 700px;
  margin: auto;
  padding: 10px;
}

#topBar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

#score {
  font-size: 16px;
}

#difficultyLevel {
  font-size: 14px;
  padding: 5px;
}

#resetBtn, #exitBtn {
  font-size: 14px;
  padding: 5px 10px;
  margin-left: 5px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  background: crimson;
  color: white;
}

#resetBtn { background: orange; }

#gameBoard {
  border: 3px solid white;
  width: 100%;
  background: linear-gradient(135deg, #a8edea, #fed6e3);
  max-width: 600px;
  height: auto;
  /*background: #111;*/
}

#controls {
  margin-top: 10px;
}

.ctrl-btn {
  font-size: 26px;
  width: 70px;
  height: 70px;
  margin: 5px;
  border-radius: 15px;
  border: none;
  background: #444;
  color: white;
  cursor: pointer;
}

.row {
  display: flex;
  justify-content: center;
}