body {
  background: #f5f5f5;
  font-family: Arial, Helvetica, sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  margin: 0;
}

.container {
  background: #fff;
  padding: 30px 40px;
  border-radius: 10px;
  box-shadow: 0 0 16px 2px #aaa;
  text-align: center;
}

h1 {
  margin-bottom: 20px;
  color: #333;
}

#game-board {
  display: grid;
  grid-template-columns: repeat(3, 80px);
  grid-template-rows: repeat(3, 80px);
  gap: 8px;
  margin-bottom: 20px;
}

.cell {
  width: 80px;
  height: 80px;
  background: #eaeaea;
  font-size: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border-radius: 6px;
  transition: background 0.2s;
}

.cell:hover {
  background: #d1d1d1;
}

#status {
  margin-bottom: 15px;
  font-size: 1.2rem;
  color: #444;
  min-height: 24px;
}

#restartBtn {
  padding: 8px 24px;
  font-size: 1rem;
  border: none;
  border-radius: 6px;
  background: #007bff;
  color: #fff;
  cursor: pointer;
  transition: background 0.2s;
}

#restartBtn:hover {
  background: #0056b3;
}