.sokudoku-wrap { max-width: 720px; margin: 1rem auto; padding: 1rem; border: 1px solid #ddd; border-radius: 8px; background:#fff; }
.sokudoku-controls { display: grid; gap: .5rem; margin-bottom: 1rem; }
.sokudoku-display { height: 120px; display:flex; align-items:center; justify-content:center; font-size: 48px; border: 1px solid #ccc; border-radius: 8px; }
.sokudoku-buttons { display: flex; gap: .5rem; margin: .75rem 0; }
.sokudoku-under { display:flex; gap:.5rem; align-items:center; }
@media (max-width: 480px) {
  .sokudoku-display { font-size: 40px; height: 100px; }
}