body {
  font-family: 'Segoe UI', sans-serif;
  background-color: #f0f0f0;
  color: #222;
  margin: 0;
  padding: 20px;
  text-align: center;
  transition: background-color 0.3s, color 0.3s;
}

body.dark-mode {
  background-color: #121212;
  color: #eee;
}

#boards {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-top: 20px;
}

.game-container {
  display: grid;
  border: 3px solid #333;
  width: max-content;
}

.cell {
  width: 30px;
  height: 30px;
  border: 1px solid #666;
  background-color: #ccc;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  cursor: pointer;
  user-select: none;
}

.cell.revealed {
  background-color: #e0e0e0;
  cursor: default;
}

.cell.flagged {
  background-color: #facc15;
}

.cell.bomb {
  background-color: #ef4444;
  color: white;
}

.spectator .cell {
  cursor: default;
  opacity: 0.85;
}