.container {
  max-width: 600px;
  margin: 0 auto;
  padding: 20px;
  text-align: center;
}

.game-controls {
  margin: 20px 0;
}

#gameBoard {
  display: inline-grid;
  grid-template-columns: repeat(9, 40px);
  gap: 1px;
  background-color: #ccc;
  padding: 1px;
  touch-action: manipulation;
}

.cell {
  width: 40px;
  height: 40px;
  background-color: #eee;
  border: 1px solid #999;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  cursor: pointer;
  user-select: none;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  touch-action: manipulation;
}

.cell.revealed {
  background-color: #ddd;
}

.cell.mine {
  background-color: red;
}

.cell.flagged {
  background-color: yellow;
}

button {
  padding: 8px 16px;
  margin: 0 10px;
  cursor: pointer;
}

#mineCount,
#timer {
  margin: 0 10px;
}

.game-message {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 100;
  justify-content: center;
  align-items: center;
}

.game-message.show {
  display: flex;
}

.message-content {
  background-color: white;
  padding: 20px;
  border-radius: 8px;
  text-align: center;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.message-content button {
  margin-top: 10px;
}

.header {
  position: relative;
  margin-bottom: 20px;
}

.back-button {
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  text-decoration: none;
  color: #333;
  padding: 8px 16px;
  border-radius: 4px;
  background-color: #f0f0f0;
  transition: background-color 0.2s;
}

.back-button:hover {
  background-color: #e0e0e0;
}

.cell.selected {
  outline: 2px solid #007aff;
  z-index: 1;
}