body {
  font-family: 'Segoe UI', sans-serif;
  background: #111;
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 20px;
}

.game-container {
  max-width: 600px;
  width: 100%;
  text-align: center;
}

.grid {
  display: grid;
  grid-template-columns: repeat(8, 50px);
  grid-template-rows: repeat(8, 50px);
  gap: 5px;
  margin: 20px 0;
}

.tile {
  width: 50px;
  height: 50px;
  background: #222;
  border-radius: 5px;
  transition: background 0.3s, box-shadow 0.3s;
}

.tile.filled {
  background: #0ff;
  box-shadow: 0 0 10px #0ff, 0 0 20px #0ff, 0 0 30px #0ff;
}

.tile.obstacle {
  background: #f00;
}

.controls button {
  margin: 5px;
  padding: 8px 15px;
  font-size: 16px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  background: #222;
  color: #fff;
  transition: all 0.2s;
}

.controls button:hover {
  background: #0ff;
  color: #000;
}