/**
 * ============================================================
 * SCROLL-TRIGGERED ANIMATIONS - Stile Apple/Linear
 * ============================================================
 * Sistema modulare per animazioni on-scroll performanti.
 * Usa SOLO transform e opacity per garantire 60fps (GPU accelerato).
 * 
 * UTILIZZO:
 *   1. Aggiungi la classe base: .reveal
 *   2. Aggiungi il tipo di animazione: .reveal--fade-up | .reveal--text-mask | .reveal--zoom-out
 *   3. (Opzionale) Aggiungi delay: .reveal--delay-1, .reveal--delay-2, .reveal--delay-3
 *   4. L'elemento riceverà automaticamente .is-visible quando entra nel viewport
 */

/* ============================================================
   BASE: Stato iniziale per tutti gli elementi animati
   ============================================================ */
.has-reveal-js .reveal {
  will-change: transform, opacity;
  /* Elementi invisibili di default (solo quando lo script è presente) */
  opacity: 0;
}

/* Base visibility state when in viewport (scoped to quando lo script è attivo) */
.has-reveal-js .reveal.is-visible {
  opacity: 1;
}

/* Safety: headings that DO NOT opt-in to reveal should remain visible
   even when the reveal system is active. This prevents accidental
   hiding of page titles when pages don't use .reveal on headings. */
.has-reveal-js h1:not(.reveal),
.has-reveal-js h2:not(.reveal),
.has-reveal-js h3:not(.reveal),
.has-reveal-js h4:not(.reveal),
.has-reveal-js h5:not(.reveal) {
  opacity: 1 !important;
  transform: none !important;
}

/* Disabilita animazioni se l'utente preferisce movimento ridotto */
@media (prefers-reduced-motion: reduce) {
  .reveal,
  .reveal--fade-up,
  .reveal--text-mask,
  .reveal--zoom-out {
    opacity: 1 !important;
    transform: none !important;
    clip-path: none !important;
    transition: none !important;
  }
}

/* ============================================================
   EFFETTO 1: FADE UP MORBIDO
   ============================================================
   L'elemento parte traslato verso il basso e trasparente,
   poi sale dolcemente diventando visibile.
   
   Esempio: <div class="reveal reveal--fade-up">...</div>
*/
.has-reveal-js .reveal--fade-up {
  opacity: 0;
  transform: translateY(60px) translateZ(0);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.has-reveal-js .reveal--fade-up.is-visible {
  opacity: 1;
  transform: translateY(0) translateZ(0);
}

/* Variante più sottile (meno spostamento) */
.has-reveal-js .reveal--fade-up-subtle {
  opacity: 0;
  transform: translateY(30px) translateZ(0);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.has-reveal-js .reveal--fade-up-subtle.is-visible {
  opacity: 1;
  transform: translateY(0) translateZ(0);
}

/* ============================================================
   EFFETTO 2: TEXT REVEAL MASK
   ============================================================
   Il testo emerge da una "maschera" invisibile usando clip-path.
   Effetto elegante per titoli e headline.
   
   Esempio: <h1 class="reveal reveal--text-mask">Titolo</h1>
*/
.has-reveal-js .reveal--text-mask {
  opacity: 0;
  clip-path: inset(100% 0 0 0);
  transform: translateY(20px) translateZ(0);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
    clip-path 0.8s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.has-reveal-js .reveal--text-mask.is-visible {
  opacity: 1;
  clip-path: inset(0 0 0 0);
  transform: translateY(0) translateZ(0);
}

/* Variante: reveal da sinistra */
.has-reveal-js .reveal--text-mask-left {
  opacity: 0;
  clip-path: inset(0 100% 0 0);
  transform: translateX(-20px) translateZ(0);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
    clip-path 0.8s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.has-reveal-js .reveal--text-mask-left.is-visible {
  opacity: 1;
  clip-path: inset(0 0 0 0);
  transform: translateX(0) translateZ(0);
}

/* ============================================================
   EFFETTO 3: IMAGE ZOOM OUT
   ============================================================
   L'immagine parte leggermente ingrandita e torna a scala normale.
   Effetto cinematografico per hero images e gallery.
   
   Esempio: <img class="reveal reveal--zoom-out" src="..." alt="...">
*/
.has-reveal-js .reveal--zoom-out {
  opacity: 0;
  transform: scale(1.15) translateZ(0);
  transition: opacity 1s cubic-bezier(0.16, 1, 0.3, 1),
    transform 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.has-reveal-js .reveal--zoom-out.is-visible {
  opacity: 1;
  transform: scale(1) translateZ(0);
}

/* Variante più sottile */
.has-reveal-js .reveal--zoom-out-subtle {
  opacity: 0;
  transform: scale(1.08) translateZ(0);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
    transform 1s cubic-bezier(0.16, 1, 0.3, 1);
}

.has-reveal-js .reveal--zoom-out-subtle.is-visible {
  opacity: 1;
  transform: scale(1) translateZ(0);
}

/* ============================================================
   EFFETTI EXTRA (Bonus)
   ============================================================ */

/* Fade semplice (solo opacità) */
.has-reveal-js .reveal--fade {
  opacity: 0;
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.has-reveal-js .reveal--fade.is-visible {
  opacity: 1;
}

/* Slide da sinistra */
.has-reveal-js .reveal--slide-left {
  opacity: 0;
  transform: translateX(-80px) translateZ(0);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.has-reveal-js .reveal--slide-left.is-visible {
  opacity: 1;
  transform: translateX(0) translateZ(0);
}

/* Slide da destra */
.has-reveal-js .reveal--slide-right {
  opacity: 0;
  transform: translateX(80px) translateZ(0);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.has-reveal-js .reveal--slide-right.is-visible {
  opacity: 1;
  transform: translateX(0) translateZ(0);
}

/* Scale up (parte piccolo) */
.has-reveal-js .reveal--scale-up {
  opacity: 0;
  transform: scale(0.9) translateZ(0);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.has-reveal-js .reveal--scale-up.is-visible {
  opacity: 1;
  transform: scale(1) translateZ(0);
}

/* ============================================================
   DELAY UTILITIES
   ============================================================
   Per creare effetti staggered (elementi che appaiono in sequenza).
   
   Esempio: 
   <div class="reveal reveal--fade-up reveal--delay-1">Primo</div>
   <div class="reveal reveal--fade-up reveal--delay-2">Secondo</div>
*/
.reveal--delay-1 {
  transition-delay: 0.1s;
}
.reveal--delay-2 {
  transition-delay: 0.2s;
}
.reveal--delay-3 {
  transition-delay: 0.3s;
}
.reveal--delay-4 {
  transition-delay: 0.4s;
}
.reveal--delay-5 {
  transition-delay: 0.5s;
}

/* ============================================================
   DURATION UTILITIES
   ============================================================
   Per controllare la velocità dell'animazione.
*/
.reveal--fast {
  transition-duration: 0.4s !important;
}

.reveal--slow {
  transition-duration: 1.2s !important;
}

/* ============================================================
   EASING ALTERNATIVES
   ============================================================
   La curva di default è "expo-out" (0.16, 1, 0.3, 1) - molto smooth.
   Queste sono alternative se vuoi effetti diversi.
*/
.reveal--ease-out {
  transition-timing-function: cubic-bezier(0, 0, 0.2, 1) !important;
}

.reveal--ease-spring {
  transition-timing-function: cubic-bezier(0.34, 1.56, 0.64, 1) !important;
}