body {
  font-family: sans-serif;
  text-align: center;
  /* margin-top: 50px; */
  background-color: #f9f9f9;
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 100px);
  grid-template-rows: repeat(3, 100px);
  gap: 5px;
  margin: 20px auto;
  width: max-content;
}

.cell {
  width: 100px;
  height: 100px;
  font-size: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: white;
  border: 1px solid #908080;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

/* .blocked {
  background-color: #716d6d;
  cursor: not-allowed;
} */
.next-to-vanish {
  background-color: rgba(255, 165, 0, 0.3); /* soft orange overlay */
  outline: 2px dashed orange;
  transition: background-color 0.3s ease;
}
@keyframes pulse {
  0% { outline-offset: 0; }
  50% { outline-offset: 4px; }
  100% { outline-offset: 0; }
}

.next-to-vanish {
  animation: pulse 1.5s infinite;
}