/* ==========================================================================
   Motion primitives
   Declarative hooks driven by assets/js/motion/*.js
   - [data-reveal]            fade + rise when in view   (Kit effect H / G)
   - [data-reveal="fade"]     opacity only
   - [data-reveal="scale"]    subtle scale-in for product surfaces
   - [data-split]             word-by-word mask reveal   (Kit effect I)
   - [data-stagger]           children receive --i for staggered delays
   Everything is gated behind html.js so content is visible without JS,
   and collapses to a static state under prefers-reduced-motion.
   ========================================================================== */

.js [data-reveal] {
  opacity: 0;
  transform: translate3d(0, var(--reveal-distance), 0);
  transition:
    opacity var(--dur-xl) var(--ease-emphasized),
    transform var(--dur-xl) var(--ease-emphasized);
  transition-delay: calc(var(--i, 0) * var(--stagger) + var(--delay, 0ms));
}

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

.js [data-reveal="scale"] {
  transform: translate3d(0, 28px, 0) scale(0.975);
  transition-duration: var(--dur-2xl), var(--dur-2xl);
}

.js [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* Word mask reveal ------------------------------------------------------- */

.split-w {
  display: inline-block;
  overflow: clip;
  vertical-align: top;
  /* room for descenders while clipped */
  padding-bottom: 0.09em;
  margin-bottom: -0.09em;
}

.js [data-split] .split-i {
  display: inline-block;
  transform: translate3d(0, 108%, 0);
  transition: transform var(--dur-2xl) var(--ease-emphasized);
  transition-delay: calc(var(--wi, 0) * 55ms + var(--delay, 0ms));
  will-change: transform;
}

.js [data-split].is-in .split-i {
  transform: none;
}

/* Scroll-highlighted words (Problem section) ---------------------------- */

.js [data-scrub-words] .scrub-w {
  opacity: 0.16;
  transition: opacity 120ms linear;
}

/* Reduced motion: present final states, no movement --------------------- */

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

  .js [data-split] .split-i {
    transform: none;
    transition: none;
  }

  .js [data-scrub-words] .scrub-w {
    opacity: 1;
  }

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