/* ==========================================================================
   Animation primitives — reveal, mask, hover micro-interactions
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* Generic reveal-on-scroll: elements start hidden, JS toggles .is-visible */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s var(--ease-editorial), transform 0.9s var(--ease-editorial);
  will-change: transform, opacity;
}

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

[data-reveal="fade"] { transform: none; }

[data-reveal-stagger] > * {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s var(--ease-editorial), transform 0.8s var(--ease-editorial);
}

[data-reveal-stagger].is-visible > * {
  opacity: 1;
  transform: translateY(0);
}

[data-reveal-stagger].is-visible > *:nth-child(1) { transition-delay: 0.05s; }
[data-reveal-stagger].is-visible > *:nth-child(2) { transition-delay: 0.12s; }
[data-reveal-stagger].is-visible > *:nth-child(3) { transition-delay: 0.19s; }
[data-reveal-stagger].is-visible > *:nth-child(4) { transition-delay: 0.26s; }
[data-reveal-stagger].is-visible > *:nth-child(5) { transition-delay: 0.33s; }
[data-reveal-stagger].is-visible > *:nth-child(6) { transition-delay: 0.4s; }

/* Mask text reveal for headings */
.mask-reveal {
  overflow: hidden;
  display: block;
}

.mask-reveal span {
  display: block;
  transform: translateY(105%);
  transition: transform 1s var(--ease-editorial);
}

.mask-reveal.is-visible span { transform: translateY(0); }

/* Image reveal — subtle scale-in with mask */
.image-reveal {
  overflow: hidden;
  position: relative;
}

.image-reveal img {
  transform: scale(1.08);
  transition: transform 1.2s var(--ease-editorial);
}

.image-reveal.is-visible img { transform: scale(1); }

.image-reveal::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--c-paper);
  transform-origin: left;
  transform: scaleX(0);
}

.image-reveal.is-animating::after {
  animation: wipeReveal 0.9s var(--ease-editorial) forwards;
}

@keyframes wipeReveal {
  0% { transform: scaleX(0); transform-origin: left; }
  50% { transform: scaleX(1); transform-origin: left; }
  50.01% { transform-origin: right; }
  100% { transform: scaleX(0); transform-origin: right; }
}

/* Timeline node pulse when revealed */
.timeline-item[data-reveal].is-visible .timeline-node {
  animation: nodePulse 0.6s var(--ease-editorial) 0.2s backwards;
}

@keyframes nodePulse {
  0% { transform: translateX(-50%) scale(0.4); opacity: 0; }
  100% { transform: translateX(-50%) scale(1); opacity: 1; }
}

/* Subtle parallax layer, JS sets --parallax-y */
[data-parallax] {
  transform: translateY(var(--parallax-y, 0));
  will-change: transform;
}

/* Progress bar for scroll */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  background: var(--c-accent);
  width: 0%;
  z-index: 1100;
  transition: width 0.1s linear;
}

/* Back to top */
.back-to-top {
  position: fixed;
  right: clamp(1.25rem, 3vw, 2.5rem);
  bottom: clamp(1.25rem, 3vw, 2.5rem);
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--c-border);
  background: var(--c-white);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.4s var(--ease-editorial), transform 0.4s var(--ease-editorial), visibility 0.4s;
  z-index: 900;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover { border-color: var(--c-accent); }

/* Loader fade-in for whole page */
body.is-loading::before {
  content: "";
  position: fixed;
  inset: 0;
  background: var(--c-white);
  z-index: 3000;
}

body:not(.is-loading) .fade-in-page {
  animation: fadeInPage 0.6s var(--ease-editorial);
}

@keyframes fadeInPage {
  from { opacity: 0; }
  to { opacity: 1; }
}