/* =========================================================
   UTILS.CSS : Animations
   ========================================================= */

/* =========================================================
   KEYFRAMES
   ========================================================= */

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

@keyframes slide-up {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

/* =========================================================
   SCROLL ANIMATIONS
   ========================================================= */

/* Visible par défaut (progressive enhancement) */
.animate-on-scroll {
  opacity: 1;
}

/* Masqué uniquement si JS actif */
body.js-ready .animate-on-scroll:not(.is-visible) {
  opacity: 0;
}

.animate-on-scroll.is-visible {
  animation-fill-mode: forwards;
  opacity: 1;
}

.fade-in.is-visible {
  animation: fade-in var(--duration-slow) var(--ease-smooth);
}

.slide-up.is-visible {
  animation: slide-up var(--duration-slow) var(--ease-smooth);
}

.scale-in.is-visible {
  animation: scale-in var(--duration-slow) var(--ease-smooth);
}

/* =========================================================
   DELAYS
   ========================================================= */

.delay-100 { animation-delay: 100ms; }
.delay-200 { animation-delay: 200ms; }
.delay-300 { animation-delay: 300ms; }
.delay-400 { animation-delay: 400ms; }
.delay-500 { animation-delay: 500ms; }
.delay-600 { animation-delay: 600ms; }

/* =========================================================
   REVEAL (transition CSS, sans keyframes)
   ========================================================= */

.reveal-item {
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity var(--duration-slow) var(--ease-smooth),
    transform var(--duration-slow) var(--ease-smooth);
}

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

/* =========================================================
   RESPECT USER PREFERENCES
   ========================================================= */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .animate-on-scroll {
    opacity: 1;
  }
}