.sudoku-rules {
  margin: 0.75rem 0 0;
  max-width: 36rem;
  color: var(--color-text);
  font-size: 0.95rem;
  line-height: 1.45;
}

.sudoku-rules__title {
  margin: 0 0 0.35rem;
  font-weight: 700;
}

.sudoku-rules ul {
  margin: 0;
  padding-left: 1.2rem;
}

.sudoku-rules li + li {
  margin-top: 0.2rem;
}

.sudoku-layout {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  align-items: flex-start;
}

.sudoku-board {
  display: grid;
  grid-template-columns: repeat(9, minmax(2rem, 2.6rem));
  grid-template-rows: repeat(9, minmax(2rem, 2.6rem));
  gap: 0;
  border: 2px solid #1a1a1a;
  width: max-content;
  user-select: none;
}

.sudoku-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  font-variant-numeric: tabular-nums;
  border-right: 1px solid #c8c8c8;
  border-bottom: 1px solid #c8c8c8;
  background: #fff;
  cursor: pointer;
  min-width: 0;
  min-height: 0;
}

.sudoku-cell:nth-child(9n) {
  border-right: none;
}

.sudoku-cell:nth-child(n+73) {
  border-bottom: none;
}

.sudoku-cell--box-r {
  border-right: 2px solid #1a1a1a;
}

.sudoku-cell--box-b {
  border-bottom: 2px solid #1a1a1a;
}

.sudoku-cell--given {
  font-weight: 700;
  color: #111;
  background: #f3f3f3;
  cursor: default;
}

.sudoku-cell--selected {
  outline: 2px solid #2a6fdb;
  outline-offset: -2px;
  z-index: 1;
}

.sudoku-cell--peer {
  background: #eef4fc;
}

.sudoku-cell--same {
  background: #dde9fb;
}

.sudoku-cell--conflict {
  color: #b00020;
  background: #fde8eb;
}

.sudoku-cell--wrong {
  color: #b00020;
  background: #f8d7da;
  box-shadow: inset 0 0 0 2px #b00020;
}

.sudoku-cell--ok {
  background: #e6f5ea;
}

.sudoku-side {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  min-width: 10rem;
}

.sudoku-pad {
  display: grid;
  grid-template-columns: repeat(3, 2.6rem);
  gap: 0.4rem;
}

.sudoku-pad__btn {
  min-height: 2.6rem;
  border: 1px solid #bbb;
  border-radius: 4px;
  background: #fafafa;
  font-size: 1.1rem;
  cursor: pointer;
}

.sudoku-pad__btn:hover,
.sudoku-pad__btn:focus-visible {
  border-color: #2a6fdb;
  background: #eef4fc;
}

.sudoku-pad__btn--clear {
  grid-column: 1 / -1;
  font-size: 0.95rem;
}

.sudoku-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

@media (max-width: 520px) {
  .sudoku-board {
    grid-template-columns: repeat(9, minmax(1.7rem, 1fr));
    grid-template-rows: repeat(9, minmax(1.7rem, 2.2rem));
    width: 100%;
  }

  .sudoku-cell {
    font-size: 1rem;
  }

  .sudoku-pad {
    grid-template-columns: repeat(5, minmax(2.2rem, 1fr));
  }

  .sudoku-pad__btn--clear {
    grid-column: span 2;
  }
}