/* The sudoku grid itself, plus the difficulty switcher above it. */

.sudoku-board {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  width: min(100%, 468px);
  aspect-ratio: 1 / 1;
  margin: var(--space-4) auto;
  background: var(--color-surface);
  border: 2px solid var(--color-text);
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.cell {
  width: 100%;
  height: 100%;
  border: 1px solid var(--color-border);
  text-align: center;
  font-size: 1.1rem;
  font-weight: 600;
  font-family: var(--font-sans);
  background: var(--color-surface);
  color: var(--color-text);
  padding: 0;
}

.cell.border-right {
  border-right: 2px solid var(--color-text);
}

.cell.border-bottom {
  border-bottom: 2px solid var(--color-text);
}

.cell.fixed {
  background: var(--color-surface-alt);
  color: var(--color-text);
  font-weight: 700;
}

.cell.editable {
  color: var(--color-primary-dark);
}

.cell.editable:focus {
  background: #eaf0ff;
}

.cell.correct {
  background: var(--color-correct-bg);
  color: var(--color-correct);
}

.cell.incorrect {
  background: var(--color-incorrect-bg);
  color: var(--color-incorrect);
}

.actions {
  margin: var(--space-4) 0;
}

.message {
  min-height: 1.5em;
  font-weight: 600;
}

.puzzle-meta {
  color: var(--color-text-muted);
}

.difficulty-switch {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin: var(--space-3) 0;
}

.difficulty-pill {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 700;
  border: 2px solid transparent;
  cursor: pointer;
  background: var(--color-surface-alt);
  color: var(--color-text-muted);
}

.difficulty-pill.difficulty-facil { color: var(--color-facil); }
.difficulty-pill.difficulty-medio { color: var(--color-medio); }
.difficulty-pill.difficulty-dificil { color: var(--color-dificil); }

.difficulty-pill.active.difficulty-facil { background: var(--color-facil-bg); border-color: var(--color-facil); }
.difficulty-pill.active.difficulty-medio { background: var(--color-medio-bg); border-color: var(--color-medio); }
.difficulty-pill.active.difficulty-dificil { background: var(--color-dificil-bg); border-color: var(--color-dificil); }

.puzzle-navigation {
  display: flex;
  justify-content: space-between;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
}

.puzzle-nav-link {
  font-weight: 600;
}

.puzzle-nav-link.disabled {
  color: var(--color-text-muted);
  opacity: 0.5;
}

@media (max-width: 560px) {
  .sudoku-board {
    width: 100%;
  }

  .cell {
    font-size: 0.95rem;
  }
}