/* Responsibilities: Apple-style scroll motion shared by the Home and the service pages.
   Load after the page stylesheets. Everything here is gated by `.has-reveal`, which reveal.js adds
   only when it runs and the visitor has not asked for reduced motion, so the content stays visible
   without JavaScript. */

:root {
  --apple-ease: cubic-bezier(0.16, 1, 0.3, 1);
}

/* --- Rise and settle on enter --- */

.has-reveal .reveal-target {
  transition:
    opacity 900ms var(--apple-ease) var(--stagger, 0ms),
    transform 1000ms var(--apple-ease) var(--stagger, 0ms),
    box-shadow 300ms var(--ease),
    border-color 300ms var(--ease);
}
.has-reveal .reveal-target:not(.is-visible) {
  opacity: 0;
  transform: translateY(44px) scale(0.97);
}

/* --- Words light up while you scroll past the paragraph --- */

.has-reveal .scrub-word {
  opacity: 0.28;
  transition: opacity 250ms linear;
}
.has-reveal .scrub-word.is-lit {
  opacity: 1;
}

/* --- The hero image drifts and grows slightly as the page scrolls --- */

.service-hero__image {
  transform: translate3d(0, var(--py, 0px), 0) scale(var(--ps, 1));
  will-change: transform;
}

/* --- Cards that pile up while scrolling; the ones underneath step back --- */

.info-cards--stack,
.steps--stack {
  display: block;
  padding-bottom: var(--space-3);
}
.info-cards--stack .info-card,
.steps--stack .step {
  position: sticky;
  top: calc(1.5rem + var(--i, 0) * 0.9rem);
  margin-bottom: 1.25rem;
  transform-origin: 50% 0;
  transform: scale(var(--scale, 1));
  transition: transform 300ms var(--apple-ease);
}
.info-cards--stack .info-card {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: var(--space-4);
  row-gap: 0.25rem;
  align-content: center;
  align-items: center;
  padding: clamp(1.4rem, 3vw, 2.2rem) clamp(1.4rem, 4vw, 2.6rem);
  background: var(--card-bg, var(--white));
  box-shadow: 0 18px 40px rgba(22, 38, 66, 0.1);
}
.info-cards--stack .info-card__number {
  grid-row: 1 / span 2;
  font-size: var(--type-xl);
  line-height: 1;
}
.info-cards--stack .info-card h3 {
  font-size: var(--type-lg);
}
.info-cards--stack .info-card p {
  font-size: var(--type-base);
}
.info-cards--stack .info-card:nth-child(6n + 2) {
  --card-bg: #f3f8fc;
}
.info-cards--stack .info-card:nth-child(6n + 3) {
  --card-bg: #eff9f7;
}
.info-cards--stack .info-card:nth-child(6n + 4) {
  --card-bg: #fff8e6;
}
.info-cards--stack .info-card:nth-child(6n + 5) {
  --card-bg: #f3f8fc;
}
.info-cards--stack .info-card:nth-child(6n) {
  --card-bg: #eff9f7;
}
.info-cards--stack .info-card:hover {
  border-color: var(--line);
  box-shadow: 0 18px 40px rgba(22, 38, 66, 0.1);
}

/* Home: the four approach steps, stacked on the navy section. */
.steps--stack .step {
  padding: clamp(1.4rem, 3vw, 2rem) clamp(1.4rem, 4vw, 2.4rem);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius);
  background: var(--card-bg, var(--navy-soft));
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.25);
}
.steps--stack .step:nth-child(2) {
  --card-bg: #2a4166;
}
.steps--stack .step:nth-child(3) {
  --card-bg: #30496f;
}
.steps--stack .step:nth-child(4) {
  --card-bg: #365178;
}
.steps--stack .step::before {
  margin-bottom: 0.75rem;
}
.steps--stack .step h3 {
  font-size: var(--type-lg);
}

/* Stacked cards keep their own transition (so the scale follows the scroll) and appear without a delay. */
.has-reveal .info-cards--stack .reveal-target,
.has-reveal .steps--stack .reveal-target {
  --stagger: 0ms !important;
  transition:
    opacity 700ms var(--apple-ease),
    transform 300ms var(--apple-ease);
}
.has-reveal .info-cards--stack .reveal-target:not(.is-visible),
.has-reveal .steps--stack .reveal-target:not(.is-visible) {
  transform: translateY(44px) scale(var(--scale, 1));
}

@media (prefers-reduced-motion: reduce) {
  .service-hero__image {
    transform: none;
  }
}