/* Sudoku Main Layout - Unified Vertical Stack for ALL devices */
.sudoku-mode .memory-grid-layout {
  display: flex !important;
  flex-direction: column !important;
  align-items: center !important; /* Horizontal centering */
  justify-content: flex-start !important; /* Pull to top */
  gap: 15px !important; /* Tight spacing "just below board" */
  width: 100% !important;
  max-width: 1000px !important;
  margin: 0 auto !important;
  padding-top: 1rem !important; /* Maintain desktop breathing room */

  /* Swapped Contrast Logic: Light mode gets DARK lines */
  --sudoku-grid-line: #333;
}

/* Correct selector: space between body class and game class */
.dark-mode .sudoku-mode .memory-grid-layout {
  /* Swapped Contrast Logic: Dark mode gets LIGHT lines */
  --sudoku-grid-line: #eee;
}

/* Also swap the board background which forms the "thick" lines (gap) 
   But KEEP the outer border consistent with the background */
.sudoku-mode .memory-board {
  background: var(--bg-secondary) !important; /* Back to theme background */
  padding: 0 !important;
  gap: 0 !important; /* REMOVE GAP: Borders provide better precision */
  border: 4px solid var(--bg-secondary) !important;
  border-radius: 8px;
  overflow: hidden;
  aspect-ratio: 1/1 !important; /* REINFORCE SYMMETRY */
}

/* Remove internal rounding to prevent background bleed at edges */
.sudoku-mode .sudoku-chunk-slot,
.sudoku-mode .mini-sudoku-grid {
  border-radius: 0 !important;
  box-sizing: border-box !important;
}

/* PIXEL-PERFECT SYMMETRY: Use borders instead of gaps to avoid rounding errors */
.sudoku-mode .sudoku-chunk-slot {
  border-right: 3px solid var(--sudoku-grid-line);
  border-bottom: 3px solid var(--sudoku-grid-line);
}

/* Remove borders on the edges of the board */
.sudoku-mode .sudoku-chunk-slot:nth-child(3n) {
  border-right: none !important;
}

.sudoku-mode .sudoku-chunk-slot:nth-child(n + 7) {
  border-bottom: none !important;
}

/* Ensure side panels and cards are completely gone */
.sudoku-mode .collected-zone,
.sudoku-mode .collected-wrapper,
.sudoku-mode .cards-area {
  display: none !important;
}

/* Center elements within the stack */
.sudoku-mode .board-wrapper {
  order: 1 !important;
  width: auto !important;
  margin: 0 !important;
  padding: 0 !important;
}

.sudoku-controls {
  order: 2 !important; /* Always below board (order 1) */
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  max-width: 400px;
  margin: 0 auto 10px auto !important; /* Center and add compact bottom margin */
  animation: slideUp 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.sudoku-controls.hidden {
  display: none !important;
}

.control-row {
  display: flex;
  justify-content: center;
  gap: 10px;
}

/* Secondary row (Actions) */
.btn-sudoku-action {
  background: var(--bg-tertiary);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  padding: 10px 20px;
  font-size: 1.2rem;
  cursor: pointer;
  transition: all 0.2s ease;
  flex: 1;
  max-width: 80px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.btn-sudoku-action:hover {
  background: var(--bg-secondary);
  transform: translateY(-2px);
}

.btn-sudoku-action:active {
  transform: translateY(0);
}

.btn-sudoku-action.active {
  background: var(--accent-color);
  color: white;
  border-color: var(--accent-color);
}

/* Primary row (Numbers) - Default: Single Row (9x1) */
.numbers {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 6px;
  width: 100%;
}

.sudoku-num {
  aspect-ratio: 1;
  background: white;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 1.4rem;
  font-weight: 700;
  color: #333;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* 3x3 Grid & Height-based Scaling - Mobile Transition */
@media (max-width: 768px) {
  .sudoku-mode .memory-grid-layout {
    flex: 1 !important; /* Take all available space between header and timer */
    min-height: 0;
    width: 100% !important;
    display: flex !important;
    flex-direction: column !important;
    justify-content: flex-start !important;
    align-items: center !important;
    gap: 8px !important;
    padding-bottom: 2px !important; /* Tightest gap */
    max-height: calc(
      100dvh - var(--header-height) - var(--footer-height) - 4px
    ) !important;
    overflow: hidden !important;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  }

  /* Ultra-Short Screens optimizations */
  @media (max-height: 660px) {
    .sudoku-mode .memory-grid-layout {
      gap: 4px !important;
      padding-bottom: 0 !important;
      justify-content: space-between !important;
    }
    .sudoku-controls {
      max-height: 38dvh !important;
      gap: 4px !important;
      margin-bottom: 2px !important;
    }
  }
}

/* 3x3 Grid & Height-based Scaling - Large Desktop */
@media (min-width: 1100px) and (min-height: 1001px) {
  .sudoku-mode .memory-grid-layout {
    flex: 1 !important;
    min-height: 0;
    display: flex !important;
    flex-direction: column !important;
    justify-content: flex-start !important;
    gap: 10px !important;
    padding-bottom: 30px !important; /* Room for timer */
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  }
}

/* Integrated 3-column Keypad (Actions + Numbers) for Mobile/Large Desktop */
@media (max-width: 768px), (min-width: 1100px) and (min-height: 1001px) {
  .sudoku-controls {
    flex: 1;
    min-height: 0;
    max-height: 28dvh; /* Budgeted: ~28% of height for keypad to allow board growth */
    display: grid !important;
    grid-template-columns: repeat(3, 1fr) !important;
    grid-template-rows: repeat(
      4,
      1fr
    ) !important; /* 1 (actions) + 3 (numbers) */
    gap: 5px !important; /* Tighter gap */
    width: auto !important;
    aspect-ratio: 3 / 4 !important;
    margin: 0 auto !important;
    height: 100% !important;
    align-self: center !important;
    justify-content: center !important; /* Center the grid content horizontally */
    justify-items: center !important; /* Center items in their cells */
  }

  /* Limit keypad size on Large Desktop to avoid over-scaling */
  @media (min-width: 1100px) and (min-height: 851px) {
    .sudoku-controls {
      max-width: 200px !important;
      max-height: 267px !important;
    }
  }

  /* Unbox buttons to make them direct children of the 4x3 grid */
  .control-row {
    display: contents !important;
  }

  .btn-sudoku-action,
  .sudoku-num {
    width: 100% !important;
    height: 100% !important;
    margin: 0 !important;
    padding: 0 !important;
    aspect-ratio: 1 / 1 !important;
    display: flex !important;
    justify-content: center !important;
    align-items: center !important;
    font-size: clamp(
      0.9rem,
      3vh,
      1.4rem
    ) !important; /* Reduced for smaller keypad */
  }

  /* Specific styles for action buttons in grid */
  .btn-sudoku-action {
    background: var(--bg-tertiary) !important;
    max-width: none !important;
    border-radius: 8px !important;
  }
}

.dark-mode .sudoku-num {
  background: #333;
  border-color: #444;
  color: #eee;
}

.sudoku-num:hover {
  background: var(--accent-color);
  color: white;
  border-color: var(--accent-color);
  transform: scale(1.1);
}

.sudoku-num:active {
  transform: scale(0.95);
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Mobile adjustments */
@media (max-width: 768px) {
  .sudoku-num {
    font-size: 1.1rem;
  }

  .btn-sudoku-action {
    padding: 8px 15px;
  }
}

/* Cell Selection */
.sudoku-mode .mini-cell:not(.has-number),
.sudoku-mode .mini-cell.user-filled {
  cursor: pointer;
}

.mini-cell.selected-cell {
  background: rgba(var(--accent-rgb), 0.2) !important;
  outline: 2px solid var(--accent-color);
  outline-offset: -2px;
  z-index: 5;
}

.mini-cell.user-filled {
  color: var(--accent-color);
  font-weight: 900;
}

/* ERROR FEEDBACK */
.mini-cell.error {
  color: #f44336 !important; /* Red for incorrect numbers */
}

/* SUCCESS FEEDBACK */
@keyframes sudokuPulseGreen {
  0% {
    box-shadow: 0 0 0 0 rgba(76, 175, 80, 0.4);
    transform: scale(1);
  }
  50% {
    box-shadow: 0 0 20px 10px rgba(76, 175, 80, 0.6);
    transform: scale(1.02);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(76, 175, 80, 0);
    transform: scale(1);
  }
}

.sudoku-mode .memory-board.board-complete {
  animation: sudokuPulseGreen 0.6s ease-out 2; /* Pulse twice like memory victory */
  border-color: #4caf50 !important;
}

/* Notes Grid */
.notes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  width: 100%;
  height: 100%;
  padding: 2px;
  box-sizing: border-box;
}

.note-slot {
  font-size: 8px; /* Use container relative sizing if needed: 3cqw? */
  display: flex;
  justify-content: center;
  align-items: center;
  color: #666;
  line-height: 1;
}

.dark-mode .note-slot {
  color: #aaa;
}

.mini-cell {
  position: relative; /* For notes-grid positioning */
}