body {
  font-family: 'Segoe UI', sans-serif;
  background-color: #f0f2f5;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.container {
  text-align: center;
  padding: 20px;
  max-width: 400px;
  width: 90%;
  background: white;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 5px;
  margin: 20px 0;
}

.cell {
  width: 100%;
  aspect-ratio: 1 / 1;
  font-size: 2.5rem;
  font-weight: bold;
  color: #333;
  border: 2px solid #ccc;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  background: #f9f9f9;
  transition: background 0.3s;
}

.cell:hover {
  background: #eaeaea;
}

button {
  padding: 10px 20px;
  font-size: 1rem;
  margin-top: 10px;
  border: none;
  border-radius: 6px;
  background-color: #4caf50;
  color: white;
  cursor: pointer;
}

button:hover {
  background-color: #43a047;
}

.scoreboard {
  display: flex;
  justify-content: space-around;
  margin-top: 10px;
  font-size: 1.1rem;
}