/* ============================================
   2048 GAME STYLES
   ============================================ */

.board-container {
  position: relative;
}

.board {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  padding: 12px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-xl);
  width: min(420px, 90vw);
  aspect-ratio: 1;
  touch-action: none;
}

.cell {
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 2rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.03);
  color: var(--text-primary);
  transition: background 0.15s, transform 0.15s, box-shadow 0.15s;
  user-select: none;
  position: relative;
  overflow: hidden;
}

.cell.pop {
  animation: cellPop 0.2s ease;
}

@keyframes cellPop {
  0% { transform: scale(0); }
  50% { transform: scale(1.15); }
  100% { transform: scale(1); }
}

@keyframes cellMerge {
  0% { transform: scale(1); }
  40% { transform: scale(1.2); }
  100% { transform: scale(1); }
}

.cell.merge {
  animation: cellMerge 0.25s ease;
}

/* Tile colors - dark theme */
.cell[data-value="2"] {
  background: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.7);
}
.cell[data-value="4"] {
  background: rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.8);
}
.cell[data-value="8"] {
  background: rgba(245, 158, 11, 0.25);
  color: #fbbf24;
  box-shadow: 0 0 20px rgba(245, 158, 11, 0.1);
}
.cell[data-value="16"] {
  background: rgba(249, 115, 22, 0.3);
  color: #fb923c;
  box-shadow: 0 0 20px rgba(249, 115, 22, 0.15);
}
.cell[data-value="32"] {
  background: rgba(239, 68, 68, 0.3);
  color: #f87171;
  box-shadow: 0 0 25px rgba(239, 68, 68, 0.15);
}
.cell[data-value="64"] {
  background: rgba(239, 68, 68, 0.4);
  color: #fca5a5;
  box-shadow: 0 0 30px rgba(239, 68, 68, 0.2);
}
.cell[data-value="128"] {
  background: rgba(234, 179, 8, 0.35);
  color: #fde047;
  box-shadow: 0 0 30px rgba(234, 179, 8, 0.2);
  font-size: 1.8rem;
}
.cell[data-value="256"] {
  background: rgba(234, 179, 8, 0.45);
  color: #fef08a;
  box-shadow: 0 0 35px rgba(234, 179, 8, 0.25);
  font-size: 1.8rem;
}
.cell[data-value="512"] {
  background: rgba(139, 92, 246, 0.4);
  color: #c4b5fd;
  box-shadow: 0 0 35px rgba(139, 92, 246, 0.25);
  font-size: 1.8rem;
}
.cell[data-value="1024"] {
  background: rgba(139, 92, 246, 0.5);
  color: #ddd6fe;
  box-shadow: 0 0 40px rgba(139, 92, 246, 0.3);
  font-size: 1.5rem;
}
.cell[data-value="2048"] {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.6), rgba(236, 72, 153, 0.6));
  color: #fff;
  box-shadow: 0 0 50px rgba(245, 158, 11, 0.3);
  font-size: 1.5rem;
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}
.cell[data-value="4096"] {
  background: linear-gradient(135deg, rgba(236, 72, 153, 0.6), rgba(139, 92, 246, 0.6));
  color: #fff;
  box-shadow: 0 0 50px rgba(236, 72, 153, 0.3);
  font-size: 1.5rem;
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}
.cell[data-value="8192"] {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.6), rgba(139, 92, 246, 0.6));
  color: #fff;
  box-shadow: 0 0 50px rgba(6, 182, 212, 0.3);
  font-size: 1.5rem;
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

/* Game Over Overlay */
.game-over-overlay {
  position: absolute;
  inset: 0;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  transition: var(--transition-base);
}

.game-over-overlay.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.game-over-content {
  text-align: center;
}

.game-over-icon {
  font-size: 3rem;
  margin-bottom: 0.75rem;
}

.game-over-content h2 {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.game-over-content p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
}

.game-over-content p span {
  color: var(--accent-orange);
  font-weight: 700;
  font-family: var(--font-display);
}

.hint-text {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-top: 1rem;
  text-align: center;
}

/* Score animation */
.score-pop {
  position: absolute;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--accent-orange);
  pointer-events: none;
  animation: scorePop 0.8s ease forwards;
  z-index: 5;
}

@keyframes scorePop {
  0% { opacity: 1; transform: translateY(0) scale(1); }
  100% { opacity: 0; transform: translateY(-40px) scale(0.8); }
}

/* RESPONSIVE */
@media (max-width: 480px) {
  .board {
    gap: 8px;
    padding: 8px;
    border-radius: var(--radius-lg);
  }
  
  .cell {
    font-size: 1.4rem;
    border-radius: var(--radius-sm);
  }
  
  .cell[data-value="128"],
  .cell[data-value="256"],
  .cell[data-value="512"] {
    font-size: 1.2rem;
  }
  
  .cell[data-value="1024"],
  .cell[data-value="2048"],
  .cell[data-value="4096"],
  .cell[data-value="8192"] {
    font-size: 1rem;
  }
}