/* ============================================================
   Satyam Advisory · animations.css
   Fade-in observer-driven · transitions parcimonieuses
   Respect prefers-reduced-motion
   ============================================================ */

/* État initial — masqué (avant observation IntersectionObserver) */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--duration-slow) var(--easing),
              transform var(--duration-slow) var(--easing);
  will-change: opacity, transform;
}

/* État révélé (ajouté par observer.js) */
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Délais cascade — pour révéler en séquence */
.reveal[data-reveal-delay="1"].is-visible { transition-delay: 80ms; }
.reveal[data-reveal-delay="2"].is-visible { transition-delay: 160ms; }
.reveal[data-reveal-delay="3"].is-visible { transition-delay: 240ms; }
.reveal[data-reveal-delay="4"].is-visible { transition-delay: 320ms; }

/* Variantes de révélation */
.reveal--from-left {
  transform: translateX(-16px);
}
.reveal--from-left.is-visible {
  transform: translateX(0);
}

.reveal--fade-only {
  transform: none;
}

/* ---------- Slide formulaire 2 étapes ---------- */

.form-step {
  transition: opacity var(--duration-base) var(--easing),
              transform var(--duration-base) var(--easing);
}

.form-step--hidden {
  opacity: 0;
  transform: translateX(-24px);
  position: absolute;
  pointer-events: none;
  visibility: hidden;
}

.form-step--visible {
  opacity: 1;
  transform: translateX(0);
}

/* ---------- Underline animé sur liens éditoriaux ---------- */

.link-animated {
  position: relative;
  border-bottom: none;
  display: inline-block;
}

.link-animated::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-slow) var(--easing);
}

.link-animated:hover::after {
  transform: scaleX(1);
}

/* ---------- Respect strict prefers-reduced-motion ---------- */

@media (prefers-reduced-motion: reduce) {
  .reveal,
  .reveal[data-reveal-delay] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .form-step--hidden {
    transition: none;
  }

  .link-animated::after {
    transition: none;
  }

  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}