@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 15px var(--color-accent-violet-glow); }
  50% { box-shadow: 0 0 28px var(--color-accent-violet); }
}

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

@keyframes flipCard {
  0% { transform: rotateY(0deg); }
  100% { transform: rotateY(180deg); }
}

@keyframes shakeError {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-8px); }
  40%, 80% { transform: translateX(8px); }
}

@keyframes confettiBounce {
  0% { transform: scale(0.8) translateY(0); opacity: 1; }
  50% { transform: scale(1.2) translateY(-10px); }
  100% { transform: scale(1) translateY(0); opacity: 1; }
}

.animate-fade-in {
  animation: fadeIn var(--transition-normal) forwards;
}

.animate-slide-up {
  animation: slideInUp var(--transition-slow) forwards;
}

.animate-shake {
  animation: shakeError 0.4s ease;
}

.animate-bounce-success {
  animation: confettiBounce 0.5s ease;
}

/* 3D Flip Card Container */
.flip-container {
  perspective: 1000px;
  width: 100%;
}

.flip-card-inner {
  position: relative;
  width: 100%;
  transition: transform var(--transition-slow);
  transform-style: preserve-3d;
}

.flip-card-inner.is-flipped {
  transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
  width: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  border-radius: var(--radius-lg);
}

.flip-card-back {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  transform: rotateY(180deg);
}