/* ============================================
   Scroll-triggered Animations
   Applied via JS IntersectionObserver adding .is-visible class
   All animations use transform + opacity only (GPU-accelerated)
   ============================================ */

/* --- Base: elements start hidden, animate when .is-visible is added --- */

.animate-fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity var(--transition-slow),
    transform var(--transition-slow);
}

.animate-fade-up.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Fade in (no movement) --- */

.animate-fade {
  opacity: 0;
  transition: opacity var(--transition-slow);
}

.animate-fade.is-visible {
  opacity: 1;
}

/* --- Scale in --- */

.animate-scale {
  opacity: 0;
  transform: scale(0.95);
  transition:
    opacity var(--transition-slow),
    transform var(--transition-slow);
}

.animate-scale.is-visible {
  opacity: 1;
  transform: scale(1);
}

/* --- Slide in from left --- */

.animate-slide-left {
  opacity: 0;
  transform: translateX(-20px);
  transition:
    opacity var(--transition-slow),
    transform var(--transition-slow);
}

.animate-slide-left.is-visible {
  opacity: 1;
  transform: translateX(0);
}

/* --- Slide in from right --- */

.animate-slide-right {
  opacity: 0;
  transform: translateX(20px);
  transition:
    opacity var(--transition-slow),
    transform var(--transition-slow);
}

.animate-slide-right.is-visible {
  opacity: 1;
  transform: translateX(0);
}

/* --- Stagger delays for grid children ---
   Apply .animate-stagger on the parent grid/flex container.
   Each direct child gets an incremental delay.
*/

.animate-stagger > * {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity var(--transition-slow),
    transform var(--transition-slow);
}

.animate-stagger.is-visible > * {
  opacity: 1;
  transform: translateY(0);
}

.animate-stagger.is-visible > *:nth-child(1) { transition-delay: 0ms; }
.animate-stagger.is-visible > *:nth-child(2) { transition-delay: 60ms; }
.animate-stagger.is-visible > *:nth-child(3) { transition-delay: 120ms; }
.animate-stagger.is-visible > *:nth-child(4) { transition-delay: 180ms; }
.animate-stagger.is-visible > *:nth-child(5) { transition-delay: 240ms; }
.animate-stagger.is-visible > *:nth-child(6) { transition-delay: 300ms; }
.animate-stagger.is-visible > *:nth-child(7) { transition-delay: 360ms; }
.animate-stagger.is-visible > *:nth-child(8) { transition-delay: 420ms; }

/* --- Hero entrance (plays on page load, not scroll) --- */

.animate-hero {
  opacity: 0;
  transform: translateY(16px);
  animation: hero-entrance 0.6s ease-out 0.3s forwards;
}

@keyframes hero-entrance {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- Reduced motion: disable everything --- */

@media (prefers-reduced-motion: reduce) {
  .animate-fade-up,
  .animate-fade,
  .animate-scale,
  .animate-slide-left,
  .animate-slide-right,
  .animate-stagger > *,
  .animate-hero {
    opacity: 1;
    transform: none;
    animation: none;
    transition: none;
  }
}