/* ===================================
   Game Grid - 4x4 Layout
   =================================== */
.game-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  max-width: 600px;
  width: 100%;
  margin: 0 auto;
  padding: var(--spacing-md);
}

/* ===================================
   Grid Square
   =================================== */
.grid-square {
  aspect-ratio: 1;
  background: rgba(20, 20, 30, 0.95);
  border: 2px solid var(--neon-red);
  background-clip: padding-box;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow:
    0 0 25px rgba(255, 23, 68, 0.5),
    0 4px 15px rgba(0, 0, 0, 0.5),
    inset 0 0 30px rgba(255, 214, 0, 0.1);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm);
  min-height: 80px;
}

.grid-square::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(45deg, var(--neon-red), var(--neon-cyan), var(--neon-gold), var(--neon-green));
  border-radius: var(--radius-lg);
  z-index: -1;
  opacity: 0.3;
}

/* Square States */
.grid-square:hover:not(.disabled):not(.answered) {
  transform: scale(1.08) translateY(-5px);
  border-color: var(--neon-cyan);
  box-shadow:
    0 0 50px var(--neon-red),
    0 0 70px var(--neon-cyan),
    0 10px 30px rgba(0, 0, 0, 0.5);
  animation: gridGlow 1.5s ease-in-out infinite;
}

@keyframes gridGlow {
  0%, 100% {
    box-shadow:
      0 0 50px var(--neon-red),
      0 0 70px var(--neon-cyan),
      0 10px 30px rgba(0, 0, 0, 0.5);
  }
  50% {
    box-shadow:
      0 0 60px var(--neon-gold),
      0 0 80px var(--neon-red),
      0 10px 35px rgba(0, 0, 0, 0.6);
  }
}

.grid-square:active:not(.disabled) {
  transform: scale(0.98);
}

.grid-square.disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

.grid-square.selected {
  border-color: var(--color-primary);
  border-width: 3px;
  box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.2);
}

/* Answered States */
.grid-square.correct {
  background: rgba(0, 0, 0, 0.9);
  border-color: var(--neon-green);
  box-shadow:
    0 0 40px var(--neon-green),
    0 0 70px var(--neon-green),
    0 5px 20px rgba(0, 0, 0, 0.5);
  animation: correctPulse 0.5s ease;
}

.grid-square.incorrect {
  background: rgba(0, 0, 0, 0.9);
  border-color: var(--neon-red);
  box-shadow:
    0 0 40px var(--neon-red),
    0 0 70px var(--neon-red),
    0 5px 20px rgba(0, 0, 0, 0.5);
  animation: incorrectShake 0.3s ease;
}

.grid-square.skipped {
  background: rgba(0, 0, 0, 0.9);
  border-color: var(--neon-gold);
  box-shadow:
    0 0 40px var(--neon-gold),
    0 0 70px var(--neon-gold),
    0 5px 20px rgba(0, 0, 0, 0.5);
  opacity: 0.9;
}

.grid-square.answered {
  cursor: default;
}

/* ===================================
   Square Content
   =================================== */
.square-category {
  position: absolute;
  top: 6px;
  left: 6px;
  font-size: 1.25rem;
  z-index: 1;
}

.square-difficulty {
  position: absolute;
  bottom: 6px;
  right: 6px;
  font-size: 0.75rem;
  color: var(--color-warning);
}

.square-number {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--neon-gold);
  margin-bottom: var(--spacing-xs);
  text-shadow: 0 0 10px var(--neon-gold);
}

.square-category-text {
  font-size: 0.75rem;
  font-weight: 700;
  text-align: center;
  color: var(--color-white);
  text-transform: uppercase;
  line-height: 1.2;
  text-shadow: 0 0 10px rgba(0, 0, 0, 0.8), 0 2px 4px rgba(0, 0, 0, 0.5);
}

.square-icon {
  font-size: 3rem;
  margin: var(--spacing-xs) 0;
  filter: drop-shadow(0 0 10px var(--neon-gold));
}

/* Result Icons */
.result-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 3rem;
  font-weight: 700;
  z-index: 2;
  animation: iconAppear 0.3s ease;
}

.result-icon.correct {
  color: var(--color-success);
}

.result-icon.incorrect {
  color: var(--color-error);
}

.result-icon.skipped {
  color: var(--color-warning);
}

/* ===================================
   Animations
   =================================== */
@keyframes correctPulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.4);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes incorrectShake {
  0%, 100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-10px);
  }
  75% {
    transform: translateX(10px);
  }
}

@keyframes iconAppear {
  0% {
    transform: translate(-50%, -50%) scale(0);
    opacity: 0;
  }
  50% {
    transform: translate(-50%, -50%) scale(1.2);
  }
  100% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
  }
}

/* Category Color Accents */
.grid-square[data-category="NFL"],
.grid-square[data-category="Sports"] {
  --category-color: #10B981;
}

.grid-square[data-category="NBA"] {
  --category-color: #F97316;
}

.grid-square[data-category="NHL"] {
  --category-color: #3B82F6;
}

.grid-square[data-category="TV Shows"],
.grid-square[data-category="Movies"] {
  --category-color: #8B5CF6;
}

.grid-square[data-category="Music"] {
  --category-color: #EC4899;
}

.grid-square[data-category="Pop Culture"] {
  --category-color: #F59E0B;
}

.grid-square[data-category="History"] {
  --category-color: #EF4444;
}

.grid-square[data-category="Science"] {
  --category-color: #14B8A6;
}

.grid-square[data-category="Geography"] {
  --category-color: #06B6D4;
}

.grid-square[data-category="Food"] {
  --category-color: #84CC16;
}

.grid-square:not(.answered):hover {
  border-color: var(--category-color, var(--color-primary));
}

/* ===================================
   Loading State
   =================================== */
.grid-square.loading {
  pointer-events: none;
}

.grid-square.loading::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.5),
    transparent
  );
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(100%);
  }
}

/* ===================================
   Streak Indicator
   =================================== */
.streak-indicator {
  position: absolute;
  top: -10px;
  right: -10px;
  background: var(--color-warning);
  color: white;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  z-index: 3;
  animation: streakPulse 0.5s ease;
  box-shadow: 0 2px 8px rgba(245, 158, 11, 0.4);
}

@keyframes streakPulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.2);
  }
}

/* ===================================
   Responsive Grid
   =================================== */
@media (max-width: 768px) {
  .game-grid {
    gap: 10px;
    max-width: 100%;
  }

  .grid-square {
    min-height: 70px;
    padding: var(--spacing-xs);
  }

  .square-category {
    font-size: 1rem;
    top: 4px;
    left: 4px;
  }

  .square-difficulty {
    font-size: 0.625rem;
    bottom: 4px;
    right: 4px;
  }

  .square-category-text {
    font-size: 0.625rem;
  }

  .square-icon {
    font-size: 1.5rem;
  }

  .result-icon {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  .game-grid {
    gap: 8px;
  }

  .grid-square {
    min-height: 60px;
    border-radius: var(--radius-sm);
  }

  .square-number {
    font-size: 0.75rem;
  }

  .square-category-text {
    font-size: 0.55rem;
  }

  .square-icon {
    font-size: 1.25rem;
  }
}

/* ===================================
   Grid Completion Effects
   =================================== */
.game-grid.completed {
  pointer-events: none;
}

.confetti {
  position: fixed;
  width: 10px;
  height: 10px;
  background: var(--color-success);
  position: absolute;
  animation: confettiFall 3s linear forwards;
  z-index: 1000;
}

@keyframes confettiFall {
  0% {
    transform: translateY(0) rotate(0deg);
    opacity: 1;
  }
  100% {
    transform: translateY(100vh) rotate(720deg);
    opacity: 0;
  }
}

/* ===================================
   Category Icons (Fallback)
   =================================== */
.category-icon {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-xs);
}

/* Default icons for categories */
.grid-square[data-category="NFL"] .category-icon::before { content: '🏈'; }
.grid-square[data-category="NBA"] .category-icon::before { content: '🏀'; }
.grid-square[data-category="NHL"] .category-icon::before { content: '🏒'; }
.grid-square[data-category="TV Shows"] .category-icon::before { content: '📺'; }
.grid-square[data-category="Movies"] .category-icon::before { content: '🎬'; }
.grid-square[data-category="Music"] .category-icon::before { content: '🎵'; }
.grid-square[data-category="Pop Culture"] .category-icon::before { content: '✨'; }
.grid-square[data-category="History"] .category-icon::before { content: '📜'; }
.grid-square[data-category="Science"] .category-icon::before { content: '🔬'; }
.grid-square[data-category="Geography"] .category-icon::before { content: '🌍'; }
.grid-square[data-category="Food"] .category-icon::before { content: '🍔'; }
.grid-square[data-category="Sports"] .category-icon::before { content: '⚽'; }

/* ===================================
   Accessibility
   =================================== */
@media (prefers-reduced-motion: reduce) {
  .grid-square,
  .result-icon,
  .streak-indicator {
    animation: none !important;
    transition: none !important;
  }

  .grid-square:hover:not(.disabled):not(.answered) {
    transform: none;
  }
}

.grid-square:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  z-index: 2;
}