/* 스도쿠 게임 전용 스타일 (공통 패널/통계/결과 UI는 assets/css/common.css 참고) */

.sudoku-app {
  margin-top: 1rem;
}

.difficulty-row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.1rem;
  flex-wrap: wrap;
}

.difficulty-btn {
  border: 1.5px solid var(--border);
  background: var(--bg);
  color: var(--fg-muted);
  border-radius: 999px;
  padding: 0.45rem 1rem;
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
}

.difficulty-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(74, 108, 247, 0.1);
}

.sudoku-board-wrap {
  position: relative;
  width: max-content;
  max-width: 100%;
  margin: 1rem auto 0;
}

.sudoku-board {
  display: grid;
  grid-template-columns: repeat(9, var(--su-cell, 38px));
  grid-template-rows: repeat(9, var(--su-cell, 38px));
  background: var(--border);
  border: 2px solid var(--fg);
  border-radius: 8px;
  gap: 1px;
  overflow: hidden;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.14);
}

.su-cell {
  background: var(--bg-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--accent);
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
  transition: background 0.12s ease, color 0.12s ease;
}

.su-cell.given {
  color: var(--fg);
  cursor: default;
}

.su-cell.selected {
  background: rgba(74, 108, 247, 0.22);
}

.su-cell.peer {
  background: var(--bg);
}

.su-cell.same-number {
  color: var(--correct);
}

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

.su-cell.hinted {
  color: #d97706;
}

.su-cell.border-right-thick {
  box-shadow: inset -2px 0 0 var(--fg);
}

.su-cell.border-bottom-thick {
  box-shadow: inset 0 -2px 0 var(--fg);
}

.su-cell.border-right-thick.border-bottom-thick {
  box-shadow: inset -2px 0 0 var(--fg), inset 0 -2px 0 var(--fg);
}

.number-pad {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.5rem;
  max-width: 320px;
  margin: 1rem auto 0;
}

.number-pad button {
  border: 1.5px solid var(--border);
  background: var(--bg-elevated);
  color: var(--fg);
  border-radius: 8px;
  padding: 0.6rem 0;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
}

.number-pad button:active {
  background: var(--border);
}

.number-pad button.erase {
  grid-column: span 1;
  font-size: 0.85rem;
}

@media (max-width: 480px) {
  .sudoku-board {
    --su-cell: 32px;
  }

  .su-cell {
    font-size: 0.92rem;
  }
}