body {
  font-family: sans-serif;
  background: #111;
  color: #eee;
  text-align: center;
  padding: 2rem;
}

select, button {
  margin: 1rem;
  padding: 0.5rem;
  font-size: 1rem;
}

.bingo-board {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  max-width: 900px;
  margin: 2rem auto;
}

.bingo-tile {
  background: #222;
  padding: 1rem;
  border: 2px solid #444;
  border-radius: 8px;
  cursor: pointer;
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  transition: all 0.2s ease;
}

.bingo-tile.marked {
  background: #0a0;
  color: #fff;
  text-decoration: line-through;
}

#multiplayerControls {
  margin: 1rem auto;
  text-align: center;
}

#status {
  font-size: 1.2rem;
  margin-top: 0.5rem;
  color: #eee;
  font-weight: bold;
}

.bingo-tile[data-selected-by="1"] {
  background: #11ff00;
  color: #fff;
}

.bingo-tile[data-selected-by="2"] {
  background: #dc3545;
  color: #fff;
}

.bingo-tile {
  transition: background-color 0.3s ease, color 0.3s ease;
}