* {
  box-sizing: border-box;
  font-family: Arial, Helvetica, sans-serif;
}

body {
  background: #0f172a;
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.game {
  text-align: center;
}

h1 {
  margin-bottom: 10px;
}

#status {
  margin-bottom: 15px;
  font-size: 1.2rem;
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 100px);
  gap: 10px;
  margin: 20px auto;
}

.cell {
  width: 100px;
  height: 100px;
  background: #1e293b;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  cursor: pointer;
  border-radius: 8px;
  transition: background 0.2s;
}

.cell:hover {
  background: #334155;
}

button {
  padding: 10px 20px;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  border-radius: 6px;
  background: #22c55e;
  color: #000;
}

button:hover {
  background: #16a34a;
}

@media (max-width: 400px) {
  .board {
    grid-template-columns: repeat(3, 80px);
  }

  .cell {
    width: 80px;
    height: 80px;
  }
}