body {
  background-color: #222;
  color: #eee;
  font-family: Arial, sans-serif;
  text-align: center;
  margin: 20px;
}

#board {
  width: 480px;
  height: 480px;
  margin: 20px auto;
  display: grid;
  grid-template-columns: repeat(8, 60px);
  grid-template-rows: repeat(8, 60px);
  border: 3px solid #444;
  user-select: none;
}

.square {
  width: 60px;
  height: 60px;
  box-sizing: border-box;
  position: relative;
}

.light {
  background-color: #f0d9b5;
}

.dark {
  background-color: #b58863;
}

.square.highlight {
  outline: 3px solid yellow;
}

.piece {
  width: 60px;
  height: 60px;
  pointer-events: none;
  user-select: none;
}

.controls {
  margin-top: 20px;
}

button {
  background-color: #555;
  color: white;
  border: none;
  padding: 10px 20px;
  margin: 10px;
  font-size: 16px;
  cursor: pointer;
  border-radius: 5px;
}

button:hover {
  background-color: #777;
}

#status {
  margin-top: 15px;
  font-size: 1.2em;
  min-height: 1.4em;
}

#board.flipped {
  transform: rotate(180deg);
}

#board.flipped .piece {
  transform: rotate(180deg);
}

#start-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 80vh;
}

.color-btn {
  background-color: #0066cc;
  color: white;
  font-size: 20px;
  margin: 15px;
  padding: 15px 30px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

.color-btn:hover {
  background-color: #0088ff;
}