body, html {
  margin: 0;
  padding: 0;
  background: #222;
  color: white;
  font-family: Arial, sans-serif;
  text-align: center;
  height: 100%;
  overflow: hidden;
}

.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 {
  width: 100vw;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

#topBar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 5px;
  background: #111;
}

#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 {
  flex-grow: 1;
 /* background: #111;*/
  background: linear-gradient(135deg, #a8edea, #fed6e3);
  border: 3px solid white;
  display: block;
}

#controls {
  /*margin: 5px 0;*/
  margin-top: 5px;
  margin-bottom: 40px; /* ⬅️ new line, pushes controls up */
}

.ctrl-btn {
  font-size: 28px;
  width: 70px;
  height: 70px;
  margin: 5px;
  border-radius: 15px;
  border: none;
  background: #444;
  color: white;
  cursor: pointer;
}

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