/* ============================================
   SCROLL REVEAL — Intersection Observer animations

   .reveal            → fade up on scroll
   .reveal-stagger    → children fade up with stagger
   .reveal-scale      → scale up on scroll
   ============================================ */

/* ─────────────────────────────────────────────────────────
 * ANIMATION STORYBOARD (per section)
 *
 *    0ms   element below viewport, invisible
 *  enter   observer fires (threshold 0.15)
 *    0ms   .reveal fades up (600ms cubic-bezier)
 *    0ms   .reveal-scale scales 0.92 → 1.0 (700ms cubic-bezier)
 *  stagger .reveal-stagger children cascade:
 *           child 1 at 0ms
 *           child 2 at 120ms
 *           child 3 at 240ms
 *           child 4 at 360ms
 * ───────────────────────────────────────────────────────── */

/* --- Base reveal: fade up --- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

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

/* --- Scale reveal: for images and videos --- */
.reveal-scale {
  opacity: 0;
  transform: scale(0.92);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

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

/* --- Stagger children: each child fades up in sequence --- */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

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

.reveal-stagger.is-visible > *:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger.is-visible > *:nth-child(2) { transition-delay: 120ms; }
.reveal-stagger.is-visible > *:nth-child(3) { transition-delay: 240ms; }
.reveal-stagger.is-visible > *:nth-child(4) { transition-delay: 360ms; }
.reveal-stagger.is-visible > *:nth-child(5) { transition-delay: 480ms; }

/* --- Reduce motion for accessibility --- */
@media (prefers-reduced-motion: reduce) {
  .reveal,
  .reveal-scale,
  .reveal-stagger > * {
    opacity: 1;
    transform: none;
    transition: none;
  }
}