.sd-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  max-width: 520px;
  margin: 0 auto;
}
.sd-board {
  display: grid;
  gap: 3px;
}
.sd-board .cell {
  aspect-ratio: 1;
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 0;
  font-size: 0.95rem;
  cursor: pointer;
}
.sd-board .cell.found {
  outline: 2px solid var(--accent, #0a7a6f);
}
.sd-board .cell.miss {
  outline: 2px solid #e63946;
}
.sd-lab {
  text-align: center;
  font-size: 0.85rem;
  opacity: 0.7;
  margin-bottom: 0.35rem;
}
@media (max-width: 520px) {
  .sd-wrap {
    grid-template-columns: 1fr;
  }
}