/* ==========================================================================
   ANIMATIONS AU SCROLL (piloté par IntersectionObserver, cf js/reveal.js)
   ========================================================================== */

[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
  will-change: opacity, transform;
}
[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

[data-reveal-group] > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--dur-med) var(--ease-out), transform var(--dur-med) var(--ease-out);
}
[data-reveal-group].is-visible > * {
  opacity: 1;
  transform: translateY(0);
}
[data-reveal-group].is-visible > *:nth-child(1) { transition-delay: 0ms; }
[data-reveal-group].is-visible > *:nth-child(2) { transition-delay: 70ms; }
[data-reveal-group].is-visible > *:nth-child(3) { transition-delay: 140ms; }
[data-reveal-group].is-visible > *:nth-child(4) { transition-delay: 210ms; }
[data-reveal-group].is-visible > *:nth-child(5) { transition-delay: 280ms; }
[data-reveal-group].is-visible > *:nth-child(6) { transition-delay: 350ms; }

[data-reveal-scale] {
  opacity: 0;
  transform: scale(0.96);
  transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
}
[data-reveal-scale].is-visible {
  opacity: 1;
  transform: scale(1);
}

/* Parallax léger (transform appliqué en JS via variable --py) */
[data-parallax] {
  transform: translateY(calc(var(--py, 0) * 1px));
  will-change: transform;
}

@media (prefers-reduced-motion: reduce) {
  [data-reveal], [data-reveal-group] > *, [data-reveal-scale] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  [data-parallax] { transform: none !important; }
}