/* assets/css/motion.css — loader + reveals + sticky (izanami adapted; cloud/VT dropped) */

/* === loader: CSS-only fixed-duration dark fade (~1.2s), not preload-gated === */
.loader {
  position: fixed; inset: 0; z-index: var(--loader-index);
  background: var(--bg);
  display: grid; place-items: center;
  opacity: 1;
  transition: opacity var(--dur) var(--ease);
}
.loader__mark {
  font-family: var(--serif);
  letter-spacing: 0.2em;
  color: var(--text);
  font-size: clamp(20px, 3vw, 28px);
}
.loader.is-hidden { opacity: 0; pointer-events: none; }

/* === narrative sections: balanced equal-height 2-col (left text / right card aligned) === */
.sticky-wrap { display: grid; grid-template-columns: minmax(0, .72fr) minmax(360px, .72fr); gap: 56px; align-items: stretch; }
.sticky-section__media { display: flex; align-items: stretch; }
@media (max-width: 1080px) {
  .sticky-wrap { grid-template-columns: 1fr; gap: 32px; align-items: start; }
  .sticky-section__media { display: block; height: auto; }
  .after-before, .flow-map-panel, .scatter-board { height: auto !important; justify-content: flex-start; }
}

/* === whileInView reveals (scoped to html.js; default visible without JS) ===
   inline [data-reveal] = visible by default; html.js hides then reveals on scroll */
html.js [data-reveal] { opacity: 0; transform: translateY(16px); transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease); }
html.js [data-reveal].is-visible { opacity: 1; transform: translateY(0); }

/* === prefers-reduced-motion: instant reveals, instant loader, auto scroll === */
@media (prefers-reduced-motion: reduce) {
  html.js [data-reveal] { opacity: 1; transform: none; transition: none; }
  .loader { transition: none; }
  *, *::before, *::after { scroll-behavior: auto !important; animation: none !important; }
}