@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fade-in-up {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fade-in-down {
  from {
    opacity: 0;
    transform: translateY(-24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slide-in-left {
  from {
    opacity: 0;
    transform: translateX(-24px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slide-in-right {
  from {
    opacity: 0;
    transform: translateX(24px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes scale-in {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes glow-pulse {
  0%, 100% {
    box-shadow: 0 0 8px hsl(var(--color-primary) / 0.3);
  }
  50% {
    box-shadow: 0 0 24px hsl(var(--color-primary) / 0.6);
  }
}

@keyframes spin-slow {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes bounce-subtle {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

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

/* Utility classes for animations */
.animate-fade-in {
  animation: fade-in 0.5s var(--ease-out-expo) both;
}

.animate-fade-in-up {
  animation: fade-in-up 0.6s var(--ease-out-expo) both;
}

.animate-fade-in-down {
  animation: fade-in-down 0.6s var(--ease-out-expo) both;
}

.animate-slide-in-left {
  animation: slide-in-left 0.5s var(--ease-out-expo) both;
}

.animate-slide-in-right {
  animation: slide-in-right 0.5s var(--ease-out-expo) both;
}

.animate-scale-in {
  animation: scale-in 0.4s var(--ease-out-expo) both;
}

.animate-glow-pulse {
  animation: glow-pulse 2s ease-in-out infinite;
}

/* Staggered animation delays */
.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }
.stagger-5 { animation-delay: 0.5s; }

/* Scroll reveal base state */
.scroll-reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease-out-expo),
              transform 0.6s var(--ease-out-expo);
}

.scroll-reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Book Player 3D animations */
@keyframes fade-scale-in {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes book-open {
  from {
    transform: rotateY(0deg);
  }
  to {
    transform: rotateY(-180deg);
  }
}

@keyframes page-turn {
  0% {
    transform: rotateY(0deg);
  }
  100% {
    transform: rotateY(-180deg);
  }
}

.animate-fade-scale-in {
  animation: fade-scale-in 0.4s cubic-bezier(0.645, 0.045, 0.355, 1) both;
}
