/* Drum Game Styles */

:root {
  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* Transitions */
  --transition-fast: 100ms ease-out;
  --transition-normal: 150ms ease-out;
}

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

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
}

/* Grid pattern overlay */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
  background-size: 20px 20px;
  pointer-events: none;
  z-index: 0;
}

/* Game Container */
.game {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-lg);
}

/* Header */
.game > h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin: 0 0 var(--space-lg) 0;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Board */
.board {
  background: var(--bg-surface);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  margin-bottom: var(--space-lg);
  user-select: none;
  -webkit-user-select: none;
}

/* Level Header */
.level-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

/* Level Title */
.level-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  min-width: 0;
  user-select: none;
  -webkit-user-select: none;
}

/* BPM Tag */
.bpm-tag {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-primary);
  background: rgba(0, 255, 245, 0.1);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  margin-left: var(--space-sm);
  vertical-align: middle;
  white-space: nowrap;
}

/* BPM Container */
.bpm-container {
  position: relative;
  display: inline-block;
  vertical-align: middle;
}

/* BPM Dropdown */
.bpm-dropdown {
  font-family: inherit;
  font-size: 0.7rem;
  padding: 0.2rem 0.4rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--box-inactive);
  border-radius: 4px;
  cursor: pointer;
  margin-left: var(--space-sm);
  vertical-align: middle;
}

.bpm-dropdown:hover {
  border-color: var(--accent-primary);
}

.bpm-dropdown:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-glow-accent);
}

.bpm-dropdown option {
  background: var(--bg-primary);
  color: var(--text-primary);
}

/* Stuck Hint Popover */
.stuck-hint {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  margin-top: var(--space-sm);
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.75rem;
  color: var(--text-primary);
  background: var(--accent-secondary);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
  z-index: 10;
}

/* Popover arrow */
.stuck-hint::before {
  content: "";
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-bottom-color: var(--accent-secondary);
}

.stuck-hint.visible {
  opacity: 1;
  visibility: visible;
  animation: pulse-hint 2s ease-in-out infinite;
}

@keyframes pulse-hint {
  0%, 100% { opacity: 0.85; }
  50% { opacity: 1; }
}

/* Level Progress Bar (top of board) */
.level-progress-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--box-border);
}

/* Level Progress Dots */
.level-progress {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  flex-wrap: wrap;
}

.level-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--box-border);
  background: transparent;
  cursor: pointer;
  transition:
    background var(--transition-normal),
    border-color var(--transition-normal),
    transform var(--transition-fast),
    box-shadow var(--transition-normal);
  padding: 0;
}

.level-dot:hover {
  border-color: var(--accent-primary);
  transform: scale(1.2);
}

.level-dot.completed {
  background: var(--success);
  border-color: var(--success);
}

.level-dot.completed:hover {
  box-shadow: var(--shadow-glow-success);
}

.level-dot.current {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-glow-primary);
  transform: scale(1.15);
}

.level-dot.locked {
  opacity: 0.3;
  cursor: default;
}

.level-dot.locked:hover {
  transform: none;
  border-color: var(--box-border);
}

.levels-remaining {
  color: var(--text-secondary);
  font-size: 0.75rem;
  margin-left: var(--space-xs);
  white-space: nowrap;
}

/* Score Display */
.score-display {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: "JetBrains Mono", "Fira Code", monospace;
}

.score-label {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.score-value {
  color: var(--accent-primary);
  font-size: 1.25rem;
  font-weight: 700;
  min-width: 60px;
}

/* Animate score changes */
.score-value.score-up {
  animation: scoreUp 300ms ease-out;
  color: var(--success);
}

.score-value.score-down {
  animation: scoreDown 300ms ease-out;
  color: var(--error);
}

@keyframes scoreUp {
  50% { transform: scale(1.2); }
}

@keyframes scoreDown {
  50% { transform: scale(0.9); }
}

/* Level Selector */
.level-selector {
  font-family: inherit;
  font-size: 0.875rem;
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--box-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  max-width: 180px;
}

.level-selector:hover {
  border-color: var(--accent-primary);
}

.level-selector:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 2px rgba(0, 255, 245, 0.2);
}

/* Start Over Button */
.start-over-btn {
  font-family: inherit;
  font-size: 0.75rem;
  padding: var(--space-xs) var(--space-sm);
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--box-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: color var(--transition-normal), border-color var(--transition-normal);
}

.start-over-btn:hover {
  color: var(--error);
  border-color: var(--error);
}

/* Description */
.board > p.i {
  color: var(--text-secondary);
  font-style: italic;
  margin: 0 0 var(--space-lg) 0;
  font-size: 0.9rem;
}

/* Pattern Canvas */
.pattern-canvas {
  margin-bottom: var(--space-xl);
}

/* Staff System - groups tracks that break together like sheet music */
.staff-system {
  margin-bottom: var(--space-lg);
}

/* Track Row */
.track {
  margin-bottom: var(--space-xs);
}

.staff-system .track:last-child {
  margin-bottom: 0;
}

/* Track Name */
.track-name {
  font-family: "JetBrains Mono", "Fira Code", monospace;
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: block;
  margin-bottom: var(--space-xs);
  cursor: pointer;
  transition: color var(--transition-normal);
}

.track-name:hover {
  color: var(--accent-primary);
}

/* Track Preview Icon (Speaker) */
.track-preview-icon {
  opacity: 0.6;
  transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.track-name:hover .track-preview-icon {
  opacity: 1;
  transform: scale(1.1);
}

/* Track Colors - Subtle background tints for box differentiation */
.box.track-color-1 {
  background: var(--track-color-1, var(--box-inactive));
}

.box.track-color-2 {
  background: var(--track-color-2, var(--box-inactive));
}

.box.track-color-3 {
  background: var(--track-color-3, var(--box-inactive));
}

.box.track-color-4 {
  background: var(--track-color-4, var(--box-inactive));
}

/* Track boxes container */
.track-boxes {
  display: flex;
  align-items: flex-start;
  gap: 2px;
}

/* Beat group container */
.beat-group {
  display: flex;
  gap: 2px;
}

/* Add spacing between beat groups */
.beat-group + .beat-group {
  margin-left: var(--space-sm);
}

/* Boxes */
.box {
  width: 36px;
  height: 36px;
  background: var(--box-inactive);
  border: 2px solid var(--box-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition:
    background var(--transition-normal),
    border-color var(--transition-normal),
    box-shadow var(--transition-normal),
    transform var(--transition-fast);
  flex-shrink: 0;
}

.box:hover {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-glow-primary);
}

.box:active {
  transform: scale(0.95);
}

/* Box States */
.box.tick {
  background: var(--success);
  border-color: var(--success);
  box-shadow: var(--shadow-glow-success);
}

.box.isActive {
  background: var(--accent-secondary);
  border-color: var(--accent-secondary);
  box-shadow: var(--shadow-glow-accent);
  animation: pulse 300ms ease-in-out;
}

.box.mistake.tick {
  background: var(--error);
  border-color: var(--error);
  box-shadow: var(--shadow-glow-error);
}

@keyframes pulse {
  50% {
    transform: scale(1.1);
  }
}

/* Victory wave animation */
@keyframes victoryWave {
  0% {
    transform: scale(1);
  }
  40% {
    transform: scale(1.2);
    background: var(--success);
    box-shadow: var(--shadow-glow-success);
  }
  100% {
    transform: scale(1);
  }
}

.box.victory-wave {
  animation: victoryWave 400ms ease-out forwards;
}

/* Final level rainbow wave animation */
@keyframes rainbowWave {
  0% {
    transform: scale(1);
    background: #ff6b6b;
    border-color: #ff6b6b;
    box-shadow: 0 0 20px rgba(255, 107, 107, 0.6);
  }
  14% {
    background: #ffa94d;
    border-color: #ffa94d;
    box-shadow: 0 0 20px rgba(255, 169, 77, 0.6);
  }
  28% {
    transform: scale(1.3);
    background: #ffd43b;
    border-color: #ffd43b;
    box-shadow: 0 0 25px rgba(255, 212, 59, 0.7);
  }
  42% {
    background: #69db7c;
    border-color: #69db7c;
    box-shadow: 0 0 20px rgba(105, 219, 124, 0.6);
  }
  57% {
    background: #4ecdc4;
    border-color: #4ecdc4;
    box-shadow: 0 0 20px rgba(78, 205, 196, 0.6);
  }
  71% {
    transform: scale(1.2);
    background: #74c0fc;
    border-color: #74c0fc;
    box-shadow: 0 0 20px rgba(116, 192, 252, 0.6);
  }
  85% {
    background: #b197fc;
    border-color: #b197fc;
    box-shadow: 0 0 20px rgba(177, 151, 252, 0.6);
  }
  100% {
    transform: scale(1);
    background: var(--success);
    border-color: var(--success);
    box-shadow: var(--shadow-glow-success);
  }
}

.box.rainbow-wave {
  animation: rainbowWave 1.2s ease-in-out forwards;
}

/* Final victory board state */
.board.final-victory .level-title {
  background: linear-gradient(90deg, #ff6b6b, #ffa94d, #ffd43b, #69db7c, #4ecdc4, #74c0fc, #b197fc);
  background-size: 200% 100%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: rainbowTitle 2s linear infinite;
}

@keyframes rainbowTitle {
  0% { background-position: 0% 50%; }
  100% { background-position: 200% 50%; }
}

/* Victory state for the board */
.board.victory .level-title {
  background: linear-gradient(90deg, var(--success), var(--accent-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Victory Overlay */
.pattern-canvas {
  position: relative;
}

.victory-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-overlay);
  border-radius: var(--radius-lg);
  z-index: 10;
  animation: fadeIn 300ms ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.victory-card {
  text-align: center;
  padding: var(--space-xl);
}

.victory-card h3 {
  font-size: 1.5rem;
  margin: 0 0 var(--space-sm) 0;
  background: linear-gradient(90deg, var(--success), var(--accent-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.victory-card p {
  color: var(--text-primary);
  margin: 0 0 var(--space-lg) 0;
}

.victory-card .next-level-btn {
  display: inline-block;
}

/* Audio Controls Container */
.audio-controls {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* Volume Control */
.volume-control {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.volume-icon {
  font-size: 1rem;
  user-select: none;
}

.volume-slider {
  width: 80px;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--box-inactive);
  border-radius: 2px;
  cursor: pointer;
}

.volume-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  background: var(--accent-primary);
  border-radius: 50%;
  cursor: pointer;
  transition: box-shadow var(--transition-normal);
}

.volume-slider::-webkit-slider-thumb:hover {
  box-shadow: var(--shadow-glow-primary);
}

.volume-slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  background: var(--accent-primary);
  border: none;
  border-radius: 50%;
  cursor: pointer;
}

.volume-slider::-moz-range-track {
  background: var(--box-inactive);
  border-radius: 2px;
  height: 4px;
}

/* Buttons */
.play-btn,
.next-level-btn {
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  padding: var(--space-md) var(--space-xl);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition:
    background var(--transition-normal),
    box-shadow var(--transition-normal),
    transform var(--transition-fast);
}

.play-btn {
  background: var(--bg-primary);
  color: var(--accent-primary);
  border: 2px solid var(--accent-primary);
  min-width: 140px;
  text-align: center;
}

.play-btn:hover:not([disabled]) {
  background: rgba(0, 255, 245, 0.1);
  box-shadow: var(--shadow-glow-primary);
}

.play-btn:active:not([disabled]) {
  transform: scale(0.98);
}

.play-btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
}

.next-level-btn {
  background: var(--success);
  color: var(--bg-primary);
}

.next-level-btn:hover {
  box-shadow: var(--shadow-glow-success);
}

.next-level-btn:active {
  transform: scale(0.98);
}

/* Finished State */
.finished {
  text-align: center;
  padding: var(--space-xl);
}

.finished h2 {
  font-size: 1.5rem;
  background: linear-gradient(90deg, var(--accent-primary), var(--success));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-lg);
}

.finished a {
  display: inline-block;
  background: var(--accent-primary);
  color: var(--bg-primary);
  text-decoration: none;
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-lg);
  font-weight: 600;
  transition: box-shadow var(--transition-normal);
}

.finished a:hover {
  box-shadow: var(--shadow-glow-primary);
}

/* Tip Panel */
.tip-panel {
  background: rgba(45, 55, 72, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  color: var(--text-secondary);
  font-size: 0.875rem;
  max-width: 600px;
}

.tip-panel strong {
  color: var(--accent-primary);
}

/* Loading State */
.pattern-canvas:empty::before,
.board .pattern-canvas:only-child::before {
  content: "Loading...";
  color: var(--text-secondary);
}

/* Mobile Responsive */
@media (max-width: 600px) {
  .game {
    padding: var(--space-md);
  }

  .board {
    padding: var(--space-md);
  }

  .track {
    flex-direction: column;
    align-items: flex-start;
  }

  .track-name {
    min-width: auto;
    text-align: left;
    padding-right: 0;
    margin-bottom: var(--space-xs);
  }

  .track-boxes {
    display: flex;
    gap: 2px;
  }

  .box {
    width: 32px;
    height: 32px;
  }

  .beat-group + .beat-group {
    margin-left: var(--space-xs);
  }

  .level-title {
    font-size: 1.25rem;
  }

  .level-header {
    flex-direction: column;
  }

  .level-progress-bar {
    flex-wrap: wrap;
  }

  .level-progress {
    flex-wrap: wrap;
  }

  .level-dot {
    width: 10px;
    height: 10px;
  }

  .audio-controls {
    flex-direction: column;
    align-items: stretch;
  }

  .play-btn,
  .next-level-btn {
    width: 100%;
  }

  .volume-control {
    justify-content: center;
    order: -1;
  }

  .volume-slider {
    width: 120px;
  }
}

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

/* Theme Switcher */
.theme-switcher {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.theme-label {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.theme-selector {
  font-family: inherit;
  font-size: 0.8rem;
  padding: 2px var(--space-xs);
  background: var(--bg-primary);
  color: var(--text-secondary);
  border: 1px solid var(--box-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--transition-normal), color var(--transition-normal);
}

.theme-selector:hover {
  border-color: var(--accent-primary);
  color: var(--text-primary);
}

.theme-selector:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.theme-selector option {
  background: var(--bg-primary);
  color: var(--text-primary);
}

/* How to Play Button */
.how-to-play-btn {
  font-family: inherit;
  font-size: 0.75rem;
  font-weight: 500;
  padding: var(--space-xs) var(--space-sm);
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--box-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  margin-left: var(--space-sm);
  vertical-align: middle;
  transition: color var(--transition-normal), border-color var(--transition-normal);
}

.how-to-play-btn:hover {
  color: var(--accent-primary);
  border-color: var(--accent-primary);
}

/* Onboarding Modal */
.onboarding-modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.7);
  z-index: 100;
  animation: fadeIn 300ms ease-out;
}

.onboarding-modal-content {
  background: var(--bg-surface);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  max-width: 400px;
  text-align: center;
  margin: var(--space-md);
}

.onboarding-modal-content h2 {
  font-size: 1.5rem;
  margin: 0 0 var(--space-md) 0;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.onboarding-modal-content p {
  color: var(--text-secondary);
  margin: 0 0 var(--space-lg) 0;
  line-height: 1.6;
}

.onboarding-start-btn {
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  padding: var(--space-md) var(--space-xl);
  background: var(--accent-primary);
  color: var(--bg-primary);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: box-shadow var(--transition-normal), transform var(--transition-fast);
}

.onboarding-start-btn:hover {
  box-shadow: var(--shadow-glow-primary);
}

.onboarding-start-btn:active {
  transform: scale(0.98);
}

/* Onboarding Popover */
.onboarding-popover {
  position: absolute;
  background: var(--accent-primary);
  color: var(--bg-primary);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  z-index: 50;
  max-width: 280px;
  line-height: 1.5;
  animation: popoverPulse 2s ease-in-out infinite;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* Arrow pointing down (popover above target) */
.onboarding-popover.arrow-down::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 8px solid transparent;
  border-top-color: var(--accent-primary);
}

/* Arrow pointing up (popover below target) */
.onboarding-popover.arrow-up::after {
  content: "";
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 8px solid transparent;
  border-bottom-color: var(--accent-primary);
}

/* Arrow pointing left (popover to the right of target) */
.onboarding-popover.arrow-left::after {
  content: "";
  position: absolute;
  top: 50%;
  right: 100%;
  transform: translateY(-50%);
  border: 8px solid transparent;
  border-right-color: var(--accent-primary);
}

@keyframes popoverPulse {
  0%, 100% { opacity: 0.95; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.02); }
}

/* Focus Visible for Keyboard Navigation */
.box:focus-visible,
.play-btn:focus-visible,
.next-level-btn:focus-visible,
.track-name:focus-visible,
.level-dot:focus-visible,
.start-over-btn:focus-visible,
.theme-selector:focus-visible,
.bpm-dropdown:focus-visible,
.how-to-play-btn:focus-visible,
.onboarding-start-btn:focus-visible,
.retry-level-btn:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/* Mistake Warning Banner */
.mistake-warning {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  margin-bottom: var(--space-md);
  background: rgba(255, 193, 7, 0.15);
  border: 1px solid rgba(255, 193, 7, 0.4);
  border-radius: var(--radius-md);
  color: #ffc107;
  font-weight: 500;
  font-size: 0.875rem;
}

.mistake-warning .warning-icon {
  font-size: 1rem;
}

.mistake-warning.critical {
  background: rgba(255, 82, 82, 0.15);
  border-color: rgba(255, 82, 82, 0.4);
  color: var(--error);
  animation: warningPulse 1s ease-in-out infinite;
}

@keyframes warningPulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.85;
    transform: scale(1.02);
  }
}

/* Level Failed Overlay */
.level-failed-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-overlay);
  border-radius: var(--radius-lg);
  z-index: 10;
  animation: fadeIn 300ms ease-out;
}

.level-failed-card {
  text-align: center;
  padding: var(--space-xl);
}

.level-failed-card h3 {
  font-size: 1.5rem;
  margin: 0 0 var(--space-sm) 0;
  color: var(--error);
}

.level-failed-card p {
  color: var(--text-primary);
  margin: 0 0 var(--space-lg) 0;
}

/* Retry Button */
.retry-level-btn {
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  padding: var(--space-md) var(--space-xl);
  background: var(--error);
  color: white;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition:
    background var(--transition-normal),
    box-shadow var(--transition-normal),
    transform var(--transition-fast);
}

.retry-level-btn:hover {
  box-shadow: var(--shadow-glow-error);
}

.retry-level-btn:active {
  transform: scale(0.98);
}

/* Board Level Failed State */
.board.level-failed .box {
  cursor: not-allowed;
}

.board.level-failed .box:hover {
  border-color: var(--box-border);
  box-shadow: none;
}

/* Failure Wave Animation */
@keyframes failureWave {
  0% {
    transform: translateX(0);
    background: var(--error);
    border-color: var(--error);
  }
  20% {
    transform: translateX(-4px);
  }
  40% {
    transform: translateX(4px);
  }
  60% {
    transform: translateX(-2px);
  }
  80% {
    transform: translateX(2px);
  }
  100% {
    transform: translateX(0);
    background: var(--error);
    border-color: var(--error);
    box-shadow: var(--shadow-glow-error);
  }
}

.box.failure-wave {
  animation: failureWave 400ms ease-out forwards;
}