/* Sudoku is kept beside its page so future pyssel can be moved independently. */
.sudoku-panel { max-width: 620px; margin: 0 auto; }
.sudoku-heading { text-align: center; }
.sudoku-heading h1 { margin-bottom: 4px; }
.sudoku-nav { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin: 14px 0 8px; }
.sudoku-nav-date { color: var(--navy); font: 600 13px var(--font-label); letter-spacing: .06em; text-align: center; text-transform: uppercase; }
.sudoku-nav .btn { padding: 8px 13px; font-size: 12px; }
.sudoku-nav .is-disabled { opacity: .4; pointer-events: none; box-shadow: none; }
.sudoku-board-wrap { display: flex; justify-content: center; }
.sudoku-board { background: var(--navy); border: 4px solid var(--navy); box-shadow: 4px 4px 0 var(--teal-dark); display: grid; gap: 2px; grid-template-columns: repeat(6, minmax(0, 1fr)); width: min(100%, 510px); }
.sudoku-cell { aspect-ratio: 1; background: var(--cream-soft); border: 0; color: var(--navy); cursor: pointer; font: 900 clamp(25px, 7vw, 42px) var(--font-display); line-height: 1; padding: 0; }
.sudoku-cell:nth-child(3n) { border-right: 4px solid var(--navy); }
.sudoku-cell:nth-child(6n) { border-right: 0; }
.sudoku-cell:nth-child(n+7):nth-child(-n+12),
.sudoku-cell:nth-child(n+19):nth-child(-n+24) { border-bottom: 4px solid var(--navy); }
.sudoku-cell.is-given { background: var(--gold); cursor: default; }
.sudoku-cell.is-selected { background-color: #fff8dc; background-image: repeating-linear-gradient(135deg, transparent 0 7px, rgba(242, 223, 160, 0.95) 7px 9px); box-shadow: inset 0 0 0 4px var(--red); }
.sudoku-cell.is-peer { background-image: repeating-linear-gradient(135deg, transparent 0 7px, rgba(242, 223, 160, 0.95) 7px 9px); }
.sudoku-cell.is-box-peer { background-image: repeating-linear-gradient(135deg, transparent 0 5px, rgba(242, 223, 160, 0.95) 5px 10px); }
.sudoku-cell.is-conflict { background: #f4b2a4; color: var(--red-dark); }
.sudoku-cell.is-complete { background: #4fae4f; color: var(--cream-soft); }
.sudoku-pad { display: grid; gap: 8px; grid-template-columns: repeat(7, minmax(38px, 1fr)); margin: 18px auto 0; max-width: 510px; }
.sudoku-number { background: var(--gold-bright); border: 3px solid var(--navy); border-radius: 10px; box-shadow: 2px 2px 0 var(--teal-dark); color: var(--navy); cursor: pointer; font: 900 23px var(--font-display); min-height: 48px; }
.sudoku-number:active { box-shadow: none; transform: translate(2px, 2px); }
.sudoku-status { min-height: 30px; margin: 14px auto 0; color: var(--navy); font: 600 14px var(--font-label); text-align: center; }
.sudoku-instructions { margin: 22px auto 0; max-width: 510px; color: var(--ink); font-size: 14px; }
.sudoku-instructions strong { color: var(--navy); font-family: var(--font-label); text-transform: uppercase; }
@media (max-width: 600px) {
  .sudoku-panel { width: 100%; }
  .sudoku-board { box-shadow: 3px 3px 0 var(--teal-dark); }
  .sudoku-pad { gap: 6px; }
  .sudoku-number { min-height: 44px; }
  .sudoku-instructions { margin-bottom: 4px; }
}