body {
  background: #f0f0f0;
  font-family: 'Segoe UI', Arial, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}
.game-container {
  background: #fff;
  padding: 2rem;
  border-radius: 16px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.1);
  text-align: center;
  position: relative;
}
.scoreboard {
  display: flex;
  justify-content: space-between;
  margin-bottom: 1rem;
  font-size: 1.2rem;
}
.grid {
  display: grid;
  grid-template-columns: repeat(3, 100px);
  grid-template-rows: repeat(3, 100px);
  gap: 16px;
  justify-content: center;
  margin-bottom: 1rem;
}
.cell {
  background: #e0e0e0;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: relative;
  transition: background 0.2s;
  height: 100px;
  width: 100px;
}
.cell img {
  width: 70px;
  height: 70px;
  user-select: none;
}
#game-over {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(255,255,255,0.95);
  padding: 2rem;
  border-radius: 16px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.15);
  z-index: 10;
}
.hidden {
  display: none;
}
#restart-btn {
  margin-top: 1rem;
  padding: 0.5rem 1.5rem;
  font-size: 1rem;
  border: none;
  border-radius: 8px;
  background: #1976d2;
  color: #fff;
  cursor: pointer;
  transition: background 0.2s;
}
#restart-btn:hover {
  background: #1565c0;
}