/* games/sudoku/style.css */

.difficulty-bar {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

/* 數獨棋盤 */
.sudoku-board {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 1px;
  background: #888;
  border: 3px solid #333;
  border-radius: 4px;
  overflow: hidden;
  width: min(90vw, 450px);
  height: min(90vw, 450px);
}

.sudoku-cell {
  background: #fff;
  border: none;
  font-size: clamp(14px, 4vw, 26px);
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font-family);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  color: var(--color-primary);
  transition: background 0.1s;
  -webkit-tap-highlight-color: transparent;
  /* 3×3 宮格粗邊框 */
  outline: none;
}

/* 每 3 格加粗右邊界 */
.sudoku-cell:nth-child(3n) { border-right: 2px solid #555; }
/* 每 3 行加粗下邊界 */
.sudoku-cell:nth-child(n+19):nth-child(-n+27),
.sudoku-cell:nth-child(n+46):nth-child(-n+54) {
  border-bottom: 2px solid #555;
}

.sudoku-cell.given {
  color: #1A1A1A;
  background: #f8f8f0;
  font-weight: 700;
  cursor: default;
}

.sudoku-cell.selected {
  background: #FFE58F;
}

.sudoku-cell.highlight {
  background: #FFF7E6;
}

.sudoku-cell.same-num {
  background: #FFD591;
}

.sudoku-cell.error {
  color: #D32F2F;
  background: #FFEBEE;
}

/* 數字輸入鍵盤 */
.sudoku-numpad {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  width: min(90vw, 450px);
}

.num-btn {
  height: 52px;
  border-radius: var(--border-radius-sm);
  border: 2px solid var(--color-border);
  background: var(--color-bg-card);
  font-size: var(--font-size-title);
  font-weight: 700;
  font-family: var(--font-family);
  cursor: pointer;
  color: var(--color-text);
  transition: all 0.15s;
  -webkit-tap-highlight-color: transparent;
}

.num-btn:hover, .num-btn:active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.erase-btn {
  grid-column: span 2;
  font-size: var(--font-size-base);
  font-weight: 600;
}