/* ================================================================
   PHILOMANUS — Animations
   Versión: 2.0 | Rediseño con Hero inmersivo
   Directiva: Quiet Confidence + Anti-AI-Look
   
   RESTRICCIÓN DE ALCANCE (RD v1.2 §7.5):
   Solo estos elementos se animan. Todo lo demás aparece sin animación.
   ================================================================ */


/* ── HERO: Logo Reveal ── */

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


/* ── HERO: Scroll Hint ── */

@keyframes hint-appear {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes hint-breathe {
  0%, 100% {
    transform: scaleY(1);
    opacity: 0.4;
  }
  50% {
    transform: scaleY(1.4);
    opacity: 0.8;
  }
}

/* Mouse wheel scroll animation */
@keyframes scroll-wheel {
  0% {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
  50% {
    opacity: 0.3;
    transform: translateX(-50%) translateY(14px);
  }
  100% {
    opacity: 0;
    transform: translateX(-50%) translateY(14px);
  }
}

/* Mobile chevron bounce */
@keyframes hint-chevron {
  0%, 100% {
    transform: rotate(45deg) translateY(0);
    opacity: 0.4;
  }
  50% {
    transform: rotate(45deg) translateY(4px);
    opacity: 0.8;
  }
}


/* Reveal elements (generic — transitions only, initial opacity/transform set post-paint by main.js) */
.reveal-element {
  transition: 
    opacity var(--reveal-duration) var(--reveal-easing),
    transform var(--reveal-duration) var(--reveal-easing);
}

/* Stagger for metrics (problema) and steps (proceso) — max 3 items */
.problema__metric.reveal-element:nth-child(1) { transition-delay: 0ms; }
.problema__metric.reveal-element:nth-child(2) { transition-delay: var(--reveal-stagger); }
.problema__metric.reveal-element:nth-child(3) { transition-delay: calc(var(--reveal-stagger) * 2); }

.proceso__step.reveal-element:nth-child(1) { transition-delay: 0ms; }
.proceso__step.reveal-element:nth-child(2) { transition-delay: var(--reveal-stagger); }
.proceso__step.reveal-element:nth-child(3) { transition-delay: calc(var(--reveal-stagger) * 2); }

/* A5: Proceso divider grows as step reveals */
.proceso__divider {
  transform-origin: left center;
  transform: scaleX(0);
  transition: transform 0.8s var(--reveal-easing);
}

.proceso__step.reveal-element.is-visible .proceso__divider {
  transform: scaleX(1);
}

.proceso__step.reveal-element:nth-child(1) .proceso__divider { transition-delay: 0.2s; }
.proceso__step.reveal-element:nth-child(2) .proceso__divider { transition-delay: calc(var(--reveal-stagger) + 0.2s); }
.proceso__step.reveal-element:nth-child(3) .proceso__divider { transition-delay: calc(var(--reveal-stagger) * 2 + 0.2s); }


/* ── PORTAFOLIO: Row reveal (Stagger) ── */
.portfolio__item.reveal-element {
  transition-delay: 0ms;
}

@media (min-width: 768px) {
  /* Al ser una lista vertical simple, el stagger clásico de filas funciona bien */
  .portfolio__item.reveal-element:nth-child(1) { transition-delay: 0ms; }
  .portfolio__item.reveal-element:nth-child(2) { transition-delay: var(--reveal-stagger); }
  .portfolio__item.reveal-element:nth-child(3) { transition-delay: calc(var(--reveal-stagger) * 2); }
  .portfolio__item.reveal-element:nth-child(4) { transition-delay: calc(var(--reveal-stagger) * 3); }
  .portfolio__item.reveal-element:nth-child(5) { transition-delay: calc(var(--reveal-stagger) * 4); }
}

/* ── NAV: Sticky appearance ── */

.nav {
  opacity: 0;
  transform: translateY(-100%);
  transition: 
    opacity var(--transition-base),
    transform var(--transition-base);
}

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


/* ── REDUCED MOTION ── */

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

  .hero__logo-mark,
  .hero__scroll-hint {
    opacity: 1;
  }

  .reveal-element,
  .hero__content .hero__title,
  .hero__content .hero__subtitle,
  .hero__content .btn--primary {
    opacity: 1;
    transform: none;
    clip-path: none;
  }
}