body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(120deg, #f6d365, #fda085);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.game-container {
  background: #fff;
  padding: 20px 40px;
  border-radius: 15px;
  box-shadow: 0 10px 20px rgba(0,0,0,0.2);
  text-align: center;
  max-width: 500px;
  width: 90%;
}

h1 {
  margin-bottom: 10px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(4, 60px);
  grid-gap: 15px;
  justify-content: center;
  margin: 20px 0;
}

.cell {
  background: #f3f3f3;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 32px;
  border-radius: 10px;
  cursor: pointer;
  transition: transform 0.2s, background 0.2s;
}

.cell.selected {
  background: #ffd700;
  transform: scale(1.1);
}

.game-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 10px;
}

button {
  padding: 6px 12px;
  font-size: 16px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  background-color: #ff6f61;
  color: #fff;
  transition: background 0.2s;
}

button:hover {
  background-color: #ff3b2f;
}

#message {
  margin-top: 15px;
  font-weight: bold;
  color: #28a745;
  font-size: 18px;
}