/* 스포일러 가림: 흐리게 처리하고, 누르거나 키보드로 포커스하면 보여 준다 */
.spoiler {
  background: var(--text-color, #2d3436);
  color: transparent;
  border-radius: 4px;
  padding: 0 4px;
  cursor: pointer;
  user-select: none;
  transition: background .2s ease, color .2s ease;
}
.spoiler.revealed, .spoiler:focus {
  background: rgba(108, 99, 255, .15);
  color: inherit;
  user-select: text;
  outline: none;
}