/* ================================
   CSS Custom Properties
   ================================ */
:root {
  /* Colors */
  --color-primary: #2c3e50;
  --color-secondary: #3498db;
  --color-accent: #27ae60;
  --color-warning: #f39c12;
  --color-danger: #e74c3c;
  --color-purple: #9b59b6;

  --color-bg: #ecf0f1;
  --color-bg-dark: #1e1e1e;
  --color-bg-darker: #151515;

  --color-text: #2c3e50;
  --color-text-light: #ffffff;
  --color-text-muted: #7f8c8d;
  --color-text-subtle: #95a5a6;

  --color-border: #dee2e6;
  --color-border-light: #e9ecef;
  --color-border-dark: #404040;

  /* Tile Colors */
  --color-tile: #34495e;
  --color-tile-hover: #4a6278;
  --color-tile-correct: #27ae60;

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 25px rgba(0, 0, 0, 0.2);
  --shadow-tile: 0 4px 8px rgba(0, 0, 0, 0.3);

  /* Layout */
  --border-radius-sm: 6px;
  --border-radius-md: 10px;
  --border-radius-lg: 16px;
  --border-radius-xl: 20px;

  /* Grid */
  --grid-size: 4;
  --gap-size: 8px;
  --tile-size: clamp(60px, 18vw, 90px);

  /* Timing */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --animation-slide: 120ms ease-out;
}

/* ================================
   Reset & Base
   ================================ */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
  overscroll-behavior: contain;
  line-height: 1.5;
  color: var(--color-text);
}

/* ================================
   Accessibility
   ================================ */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

:focus-visible {
  outline: 3px solid var(--color-secondary);
  outline-offset: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}

/* ================================
   Game Container
   ================================ */
.game-container {
  background: var(--color-bg);
  border-radius: var(--border-radius-xl);
  padding: 30px;
  box-shadow: var(--shadow-lg);
  max-width: 500px;
  width: 100%;
  text-align: center;
  -webkit-user-select: none;
  user-select: none;
}

/* ================================
   Header
   ================================ */
.game-header {
  margin-bottom: 25px;
}

.game-header h1 {
  color: var(--color-primary);
  font-size: clamp(1.8rem, 5vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.instructions {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.4;
}

/* ================================
   Stats Bar
   ================================ */
.stats-bar {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin-bottom: 25px;
  padding: 15px 20px;
  background: white;
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-sm);
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 60px;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--color-text-subtle);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 4px;
}

.stat-value {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
  min-width: 3ch;
}

/* ================================
   Puzzle Board
   ================================ */
.puzzle-wrapper {
  display: flex;
  justify-content: center;
  margin-bottom: 25px;
}

.puzzle-board {
  display: grid;
  grid-template-columns: repeat(var(--grid-size), var(--tile-size));
  grid-template-rows: repeat(var(--grid-size), var(--tile-size));
  gap: var(--gap-size);
  padding: 15px;
  background: var(--color-primary);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  touch-action: none;
}

.puzzle-board.animating {
  pointer-events: none;
}

/* ================================
   Tiles
   ================================ */
.tile {
  display: flex;
  justify-content: center;
  align-items: center;
  background: linear-gradient(
    145deg,
    var(--color-tile-hover),
    var(--color-tile)
  );
  color: var(--color-text-light);
  font-size: clamp(1.2rem, 4vw, 1.8rem);
  font-weight: 700;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  -webkit-user-select: none;
  user-select: none;
  transition: transform var(--transition-fast),
    box-shadow var(--transition-fast), background var(--transition-fast);
  box-shadow: inset 0 2px 0 rgba(255, 255, 255, 0.1), var(--shadow-tile);
  position: relative;
  overflow: hidden;
  border: none;
}

.tile::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 50%;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.1), transparent);
  border-radius: var(--border-radius-md) var(--border-radius-md) 0 0;
  pointer-events: none;
}

@media (hover: hover) and (pointer: fine) {
  .tile:hover:not(.empty):not(.tile--disabled) {
    transform: scale(1.02);
    background: linear-gradient(145deg, #5a7288, #44596e);
  }
}

.tile:active:not(.empty):not(.tile--disabled) {
  transform: scale(0.98);
}

.tile.movable:not(:hover):not(:focus) {
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    box-shadow: inset 0 2px 0 rgba(255, 255, 255, 0.1), var(--shadow-tile);
  }

  50% {
    box-shadow: inset 0 2px 0 rgba(255, 255, 255, 0.1), var(--shadow-tile),
      0 0 0 3px rgba(52, 152, 219, 0.4);
  }
}

.tile.empty {
  background: rgba(0, 0, 0, 0.2);
  cursor: default;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.3);
  pointer-events: none;
}

.tile.empty::before {
  display: none;
}

.tile.correct:not(.empty) {
  background: linear-gradient(145deg, #2ecc71, var(--color-tile-correct));
}

.tile.sliding {
  transition: transform var(--animation-slide);
  z-index: 10;
}

.tile--disabled {
  cursor: wait;
  opacity: 0.9;
}

/* Hint highlight */
.tile.hint-highlight {
  animation: hint-flash 0.4s ease-in-out 3;
  outline: 4px solid var(--color-danger);
  outline-offset: -2px;
}

@keyframes hint-flash {
  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.05);
  }
}

/* ================================
   Buttons Base
   ================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: none;
  border-radius: var(--border-radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
  min-height: 44px;
  min-width: 44px;
  text-decoration: none;
  font-family: inherit;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

.btn-icon {
  width: 1.1em;
  height: 1.1em;
  flex-shrink: 0;
}

.btn-icon-sm {
  width: 0.9em;
  height: 0.9em;
  flex-shrink: 0;
}

/* Primary Button */
.btn-primary {
  background: linear-gradient(145deg, #3498db, #2980b9);
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(145deg, #2980b9, #2471a3);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

/* Secondary Button */
.btn-secondary {
  background: white;
  color: var(--color-primary);
  border: 2px solid var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
  background: #f8f9fa;
  border-color: #ccc;
  transform: translateY(-2px);
}

/* Control Buttons */
.controls {
  display: flex;
  justify-content: center;
  gap: 15px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

/* ================================
   Mobile Controls
   ================================ */
.mobile-controls {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
}

.arrow-row {
  display: flex;
  gap: 8px;
}

.arrow-btn {
  width: 55px;
  height: 55px;
  border: none;
  border-radius: var(--border-radius-md);
  background: white;
  color: var(--color-primary);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
}

.arrow-btn svg {
  width: 24px;
  height: 24px;
}

.arrow-btn:hover:not(:disabled) {
  background: var(--color-secondary);
  color: white;
  transform: scale(1.05);
}

.arrow-btn:active:not(:disabled) {
  transform: scale(0.95);
}

.arrow-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

@media (pointer: coarse) {
  .mobile-controls {
    display: flex;
  }
}

@media (max-width: 480px) {
  .mobile-controls {
    display: flex;
  }
}

/* ================================
   Win Modal
   ================================ */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal),
    visibility var(--transition-normal);
  z-index: 1000;
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  padding: 20px;
}

.modal-overlay[hidden] {
  display: none;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: white;
  padding: 40px;
  border-radius: var(--border-radius-xl);
  text-align: center;
  transform: scale(0.8) translateY(20px);
  transition: transform var(--transition-normal);
  box-shadow: var(--shadow-lg);
  max-width: 350px;
  width: 100%;
}

.modal-overlay.active .modal-content {
  transform: scale(1) translateY(0);
}

.win-icon {
  margin-bottom: 15px;
}

.win-icon svg {
  width: 64px;
  height: 64px;
  stroke: var(--color-accent);
}

.modal-content h2 {
  color: var(--color-accent);
  font-size: 1.8rem;
  margin-bottom: 20px;
}

.win-stats {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin-bottom: 15px;
}

.win-stats p {
  font-size: 1.1rem;
  color: var(--color-text);
}

.win-stats span {
  font-weight: 700;
  color: var(--color-secondary);
}

.win-message {
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 20px;
  min-height: 24px;
}

/* Celebration */
@keyframes celebrate {
  0%,
  100% {
    transform: scale(1);
  }

  25% {
    transform: scale(1.03) rotate(-1deg);
  }

  75% {
    transform: scale(1.03) rotate(1deg);
  }
}

.puzzle-board.winning {
  animation: celebrate 0.5s ease-in-out;
}

/* ================================
   Solver Section
   ================================ */
.solver-section {
  margin-top: 25px;
  border-top: 2px solid var(--color-border);
  padding-top: 20px;
}

.btn-solver {
  background: linear-gradient(145deg, #9b59b6, #8e44ad);
  color: white;
  width: 100%;
  padding: 14px 20px;
  border: none;
  border-radius: var(--border-radius-md);
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: all var(--transition-normal);
  box-shadow: 0 4px 15px rgba(155, 89, 182, 0.3);
}

.btn-solver:hover {
  background: linear-gradient(145deg, #8e44ad, #7d3c98);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(155, 89, 182, 0.4);
}

.btn-solver.active {
  background: linear-gradient(145deg, #7d3c98, #6c3483);
}

.btn-solver .btn-icon {
  transition: transform 0.4s ease;
}

.btn-solver.active .btn-icon {
  transform: rotate(180deg);
}

/* Solver Panel */
.solver-panel {
  margin-top: 15px;
  padding: 20px;
  background: linear-gradient(145deg, #f8f9fa, #fff);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  text-align: left;
}

.solver-header {
  margin-bottom: 18px;
}

.solver-header h3 {
  color: var(--color-primary);
  font-size: 1.15rem;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-icon {
  width: 1.1em;
  height: 1.1em;
  opacity: 0.8;
}

.header-icon-sm {
  width: 0.9em;
  height: 0.9em;
  opacity: 0.8;
}

.solver-info {
  color: var(--color-text-muted);
  font-size: 0.88rem;
  line-height: 1.4;
}

/* Script Input */
.solver-input-wrapper {
  margin-bottom: 15px;
}

.solver-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  flex-wrap: wrap;
  gap: 8px;
}

.solver-label {
  font-weight: 600;
  color: var(--color-primary);
  font-size: 0.92rem;
}

.btn-copy {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 12px;
  background: #e9ecef;
  border: none;
  border-radius: var(--border-radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  color: #495057;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-copy:hover {
  background: #dee2e6;
  color: var(--color-primary);
}

.btn-copy.copied {
  background: var(--color-accent);
  color: white;
}

.btn-copy.copy-error {
  background: var(--color-danger);
  color: white;
}

.solver-script-input {
  width: 100%;
  min-height: 180px;
  max-height: 350px;
  padding: 14px;
  border: 2px solid #e0e0e0;
  border-radius: var(--border-radius-md);
  font-family: "Fira Code", "Consolas", "Monaco", "Courier New", monospace;
  font-size: 0.8rem;
  line-height: 1.6;
  resize: vertical;
  background: var(--color-bg-dark);
  color: #d4d4d4;
  transition: all var(--transition-normal);
}

.solver-script-input:focus {
  outline: none;
  border-color: var(--color-purple);
  box-shadow: 0 0 0 4px rgba(155, 89, 182, 0.15);
}

.solver-script-input.editable {
  background: var(--color-bg-darker);
  border-color: var(--color-warning);
}

.solver-script-input[readonly] {
  cursor: default;
}

/* Scrollbar for script input */
.solver-script-input::-webkit-scrollbar {
  width: 10px;
}

.solver-script-input::-webkit-scrollbar-track {
  background: var(--color-bg-darker);
  border-radius: 5px;
}

.solver-script-input::-webkit-scrollbar-thumb {
  background: #555;
  border-radius: 5px;
}

.solver-script-input::-webkit-scrollbar-thumb:hover {
  background: #777;
}

/* Solver Actions */
.solver-actions {
  display: flex;
  gap: 10px;
  margin-bottom: 15px;
  flex-wrap: wrap;
}

.btn-load {
  flex: 2;
  background: linear-gradient(145deg, #27ae60, #219a52);
  color: white;
  padding: 12px 18px;
  border: none;
  border-radius: var(--border-radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  box-shadow: 0 4px 12px rgba(39, 174, 96, 0.3);
  min-width: 140px;
}

.btn-load:hover:not(:disabled) {
  background: linear-gradient(145deg, #219a52, #1e8449);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(39, 174, 96, 0.4);
}

.btn-load:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

.btn-reload {
  flex: 2;
  background: linear-gradient(145deg, #f39c12, #e67e22);
  color: white;
  padding: 12px 18px;
  border: none;
  border-radius: var(--border-radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  box-shadow: 0 4px 12px rgba(243, 156, 18, 0.3);
  min-width: 140px;
}

.btn-reload:hover:not(:disabled) {
  background: linear-gradient(145deg, #e67e22, #d35400);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(243, 156, 18, 0.4);
}

.btn-reload:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.btn-edit {
  flex: 1;
  background: #fff;
  color: #495057;
  padding: 12px 18px;
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 100px;
}

.btn-edit:hover {
  background: #f8f9fa;
  border-color: #ced4da;
}

.btn-edit.editing {
  background: #fff3cd;
  border-color: var(--color-warning);
  color: #856404;
}

/* Solver Status */
.solver-status {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: #fff;
  border-radius: var(--border-radius-md);
  margin-bottom: 15px;
  border: 1px solid var(--color-border);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.status-indicator {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #adb5bd;
  flex-shrink: 0;
  transition: all var(--transition-normal);
}

.status-indicator.status-idle {
  background: #adb5bd;
}

.status-indicator.status-loading {
  background: var(--color-warning);
  animation: status-pulse 1s ease-in-out infinite;
}

.status-indicator.status-success {
  background: var(--color-accent);
  box-shadow: 0 0 12px rgba(39, 174, 96, 0.6);
}

.status-indicator.status-error {
  background: var(--color-danger);
  box-shadow: 0 0 12px rgba(231, 76, 60, 0.6);
}

@keyframes status-pulse {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }

  50% {
    opacity: 0.6;
    transform: scale(0.9);
  }
}

.status-text {
  color: #495057;
  font-size: 0.92rem;
  font-weight: 500;
}

/* Solver Commands */
.solver-commands {
  margin-bottom: 15px;
}

.solver-commands h4 {
  color: var(--color-primary);
  font-size: 0.95rem;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.command-buttons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(85px, 1fr));
  gap: 10px;
  margin-bottom: 18px;
}

.cmd-btn {
  padding: 12px 10px;
  border: none;
  border-radius: var(--border-radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
  color: white;
  position: relative;
  overflow: hidden;
}

.cmd-icon {
  width: 1.3em;
  height: 1.3em;
}

.cmd-text {
  font-size: 0.8rem;
}

.cmd-btn:hover:not(:disabled) {
  transform: translateY(-3px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.15);
}

.cmd-btn:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

.cmd-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.cmd-btn.loading {
  pointer-events: none;
}

.cmd-btn.loading::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% {
    left: -100%;
  }

  100% {
    left: 100%;
  }
}

.cmd-btn.cmd-solve {
  background: linear-gradient(145deg, #3498db, #2980b9);
}

.cmd-btn.cmd-instant {
  background: linear-gradient(145deg, #9b59b6, #8e44ad);
}

.cmd-btn.cmd-hint {
  background: linear-gradient(145deg, #f39c12, #e67e22);
}

.cmd-btn.cmd-analyze {
  background: linear-gradient(145deg, #1abc9c, #16a085);
}

.cmd-btn.cmd-stop {
  background: linear-gradient(145deg, #e74c3c, #c0392b);
}

/* Speed Control */
.speed-control {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  background: #fff;
  border-radius: var(--border-radius-md);
  border: 1px solid var(--color-border);
  margin-bottom: 15px;
  flex-wrap: wrap;
}

.speed-control label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  color: #495057;
  font-size: 0.92rem;
  white-space: nowrap;
}

.label-icon {
  width: 1em;
  height: 1em;
  opacity: 0.7;
}

.speed-control input[type="range"] {
  flex: 1;
  min-width: 100px;
  height: 8px;
  -webkit-appearance: none;
  appearance: none;
  background: linear-gradient(
    90deg,
    var(--color-purple),
    var(--color-secondary)
  );
  border-radius: 4px;
  outline: none;
  cursor: pointer;
}

.speed-control input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: white;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  border: 3px solid var(--color-purple);
  transition: transform 0.2s ease;
}

.speed-control input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.speed-control input[type="range"]::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: white;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  border: 3px solid var(--color-purple);
}

#speed-value {
  min-width: 55px;
  text-align: right;
  font-weight: 700;
  color: var(--color-purple);
  font-size: 0.95rem;
  font-family: "Fira Code", monospace;
}

/* Console Output */
.console-output-wrapper {
  background: var(--color-bg-dark);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border-dark);
}

.console-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  background: var(--color-bg-darker);
  border-bottom: 1px solid var(--color-border-dark);
}

.console-title {
  display: flex;
  align-items: center;
  gap: 6px;
  color: #888;
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.btn-clear-console {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  background: #404040;
  border: none;
  border-radius: 4px;
  color: #aaa;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-clear-console:hover {
  background: #555;
  color: #fff;
}

.console-output {
  min-height: 120px;
  max-height: 200px;
  overflow-y: auto;
  padding: 12px 14px;
  font-family: "Fira Code", "Consolas", monospace;
  font-size: 0.8rem;
  line-height: 1.6;
  -webkit-overflow-scrolling: touch;
}

.console-line {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  color: #d4d4d4;
  margin-bottom: 4px;
  padding: 3px 0;
  word-break: break-word;
}

.line-icon {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  margin-top: 2px;
  opacity: 0.7;
}

.line-text {
  flex: 1;
  min-width: 0;
}

.console-line.console-success {
  color: #4ade80;
}

.console-line.console-success .line-icon {
  opacity: 1;
}

.console-line.console-error {
  color: #f87171;
}

.console-line.console-error .line-icon {
  opacity: 1;
}

.console-line.console-info {
  color: #60a5fa;
}

.console-line.console-info .line-icon {
  opacity: 1;
}

/* Console scrollbar */
.console-output::-webkit-scrollbar {
  width: 8px;
}

.console-output::-webkit-scrollbar-track {
  background: var(--color-bg-dark);
}

.console-output::-webkit-scrollbar-thumb {
  background: #444;
  border-radius: 4px;
}

.console-output::-webkit-scrollbar-thumb:hover {
  background: #555;
}

/* Solver Usage */
.solver-usage {
  padding: 18px;
  background: linear-gradient(145deg, #fff, #f8f9fa);
  border-radius: var(--border-radius-md);
  border: 1px solid var(--color-border);
}

.solver-usage h4 {
  color: var(--color-primary);
  font-size: 0.98rem;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.solver-usage ol {
  margin: 0;
  padding-left: 22px;
}

.solver-usage li {
  color: #495057;
  font-size: 0.88rem;
  line-height: 1.7;
  margin-bottom: 8px;
}

.solver-usage li:last-child {
  margin-bottom: 0;
}

.solver-usage li strong {
  color: var(--color-primary);
}

/* ================================
   Responsive
   ================================ */
@media (max-width: 480px) {
  body {
    padding: 10px;
    align-items: flex-start;
    padding-top: 20px;
  }

  .game-container {
    padding: 20px 15px;
    border-radius: var(--border-radius-lg);
  }

  .game-header {
    margin-bottom: 20px;
  }

  .stats-bar {
    gap: 15px;
    padding: 12px 15px;
  }

  .stat-value {
    font-size: 1.2rem;
  }

  .controls {
    flex-direction: column;
    gap: 10px;
  }

  .btn {
    width: 100%;
  }

  .modal-content {
    padding: 30px 20px;
  }

  .modal-content h2 {
    font-size: 1.6rem;
  }

  .solver-panel {
    padding: 16px;
  }

  .solver-script-input {
    min-height: 140px;
    font-size: 0.75rem;
  }

  .solver-actions {
    flex-direction: column;
  }

  .btn-load,
  .btn-reload,
  .btn-edit {
    flex: none;
    width: 100%;
    min-width: auto;
  }

  .command-buttons {
    grid-template-columns: repeat(3, 1fr);
  }

  .cmd-btn {
    padding: 10px 6px;
  }

  .cmd-icon {
    width: 1.1em;
    height: 1.1em;
  }

  .cmd-text {
    font-size: 0.72rem;
  }

  .speed-control {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .speed-control label {
    justify-content: space-between;
  }

  .speed-control input[type="range"] {
    width: 100%;
  }

  #speed-value {
    text-align: left;
  }

  .console-output {
    min-height: 100px;
    max-height: 150px;
    font-size: 0.75rem;
  }

  .solver-usage {
    padding: 14px;
  }

  .solver-usage li {
    font-size: 0.82rem;
  }
}

@media (max-width: 360px) {
  .command-buttons {
    grid-template-columns: repeat(2, 1fr);
  }

  .cmd-btn.cmd-stop {
    grid-column: span 2;
  }
}

/* ================================
   Reduced Motion
   ================================ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .tile.movable:not(:hover):not(:focus) {
    animation: none;
  }

  .cmd-btn.loading::after {
    animation: none;
  }
}

/* ================================
   High Contrast
   ================================ */
@media (prefers-contrast: high) {
  .tile {
    border: 2px solid white;
  }

  .tile.empty {
    border: 2px dashed rgba(255, 255, 255, 0.5);
  }

  .btn,
  .cmd-btn {
    border: 2px solid currentColor;
  }

  .solver-script-input {
    border-width: 3px;
  }
}

/* ================================
   Print
   ================================ */
@media print {
  .controls,
  .mobile-controls,
  .modal-overlay,
  .solver-section {
    display: none !important;
  }

  body {
    background: white;
  }

  .game-container {
    box-shadow: none;
    border: 1px solid #ccc;
  }
}