/* 091 — Parallax Layers
   Scène décorative multi-couches dans un scroller interne : la scène est
   sticky, un spacer crée la course de défilement, et chaque couche translate
   à sa propre vitesse (--parallax-layers-shift) via animation-timeline:
   scroll(nearest). Le titre central se dévoile entre 12 % et 60 %.
   CSS pur. Fallback sans support : scène statique (spacer replié, tout
   visible), aucun contenu perdu. */

.parallax-layers {
  position: relative;
  width: min(340px, 100%);
}

.parallax-layers__viewport {
  height: 230px;
  overflow-y: auto;
  overscroll-behavior: contain;
  border-radius: 14px;
  border: 1px solid color-mix(in oklab, var(--ml-fg, #e8eaf2) 8%, transparent);
  background: var(--ml-bg, #0d1017);
  scrollbar-width: thin;
  scrollbar-color: color-mix(in oklab, var(--ml-fg, #e8eaf2) 16%, transparent) transparent;
}

.parallax-layers__viewport:focus-visible {
  outline: 2px solid var(--ml-accent-2, #2dd4bf);
  outline-offset: 2px;
}

.parallax-layers__viewport::-webkit-scrollbar { width: 6px; }
.parallax-layers__viewport::-webkit-scrollbar-track { background: transparent; }
.parallax-layers__viewport::-webkit-scrollbar-thumb {
  border-radius: 3px;
  background: color-mix(in oklab, var(--ml-fg, #e8eaf2) 16%, transparent);
}

/* La scène reste collée pendant toute la course du spacer */
.parallax-layers__scene {
  position: sticky;
  top: 0;
  height: 230px;
  /* clip et non hidden : hidden ferait de la scène un scroll container,
     et scroll(nearest) des couches s'y rattacherait (timeline inactive) */
  overflow: clip;
  background:
    linear-gradient(180deg,
      color-mix(in oklab, var(--ml-accent, #7c8cff) 12%, var(--ml-bg, #0d1017)),
      var(--ml-bg, #0d1017) 62%);
}

/* Course de défilement (repliée en fallback et en reduced motion) */
.parallax-layers__spacer {
  height: 300px;
}

/* Couches — plus hautes que la scène pour couvrir la translation */
.parallax-layers__layer {
  position: absolute;
  inset: -40px 0;
  pointer-events: none;
}

/* Fond : lueurs diffuses + poussière d'étoiles */
.parallax-layers__layer--back {
  --parallax-layers-shift: -22px;
  background:
    radial-gradient(95px 95px at 22% 30%,
      color-mix(in oklab, var(--ml-accent, #7c8cff) 26%, transparent), transparent 70%),
    radial-gradient(120px 120px at 80% 20%,
      color-mix(in oklab, var(--ml-accent-2, #2dd4bf) 18%, transparent), transparent 70%),
    radial-gradient(2px 2px at 15% 58%,
      color-mix(in oklab, var(--ml-fg, #e8eaf2) 55%, transparent), transparent 60%),
    radial-gradient(1.5px 1.5px at 45% 24%,
      color-mix(in oklab, var(--ml-fg, #e8eaf2) 45%, transparent), transparent 60%),
    radial-gradient(2px 2px at 68% 48%,
      color-mix(in oklab, var(--ml-fg, #e8eaf2) 40%, transparent), transparent 60%),
    radial-gradient(1.5px 1.5px at 88% 62%,
      color-mix(in oklab, var(--ml-fg, #e8eaf2) 50%, transparent), transparent 60%);
}

/* Collines médianes, teintées accent / accent-2 */
.parallax-layers__layer--mid {
  --parallax-layers-shift: -54px;
}

.parallax-layers__layer--mid::before,
.parallax-layers__layer--mid::after {
  content: "";
  position: absolute;
  border-radius: 50%;
}

.parallax-layers__layer--mid::before {
  left: -22%;
  bottom: -140px;
  width: 80%;
  height: 200px;
  background: color-mix(in oklab, var(--ml-accent, #7c8cff) 24%, var(--ml-surface, #151a24));
}

.parallax-layers__layer--mid::after {
  right: -26%;
  bottom: -155px;
  width: 88%;
  height: 210px;
  background: color-mix(in oklab, var(--ml-accent-2, #2dd4bf) 16%, var(--ml-surface, #151a24));
}

/* Premier plan : grande dune sombre + lucioles accent */
.parallax-layers__layer--front {
  --parallax-layers-shift: -98px;
  background:
    radial-gradient(3px 3px at 30% 76%,
      color-mix(in oklab, var(--ml-accent, #7c8cff) 80%, transparent), transparent 60%),
    radial-gradient(2.5px 2.5px at 74% 82%,
      color-mix(in oklab, var(--ml-accent-2, #2dd4bf) 75%, transparent), transparent 60%);
}

.parallax-layers__layer--front::before {
  content: "";
  position: absolute;
  left: -18%;
  bottom: -175px;
  width: 136%;
  height: 230px;
  border-radius: 48% 52% 0 0 / 100% 100% 0 0;
  background: color-mix(in oklab, var(--ml-bg, #0d1017) 78%, var(--ml-accent, #7c8cff));
}

/* Titre central, dévoilé pendant le défilement */
.parallax-layers__caption {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 5px;
  text-align: center;
}

.parallax-layers__kicker {
  margin: 0;
  font: 600 10px/1 system-ui, -apple-system, sans-serif;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ml-accent-2, #2dd4bf);
}

.parallax-layers__title {
  margin: 0;
  font: 700 26px/1.1 system-ui, -apple-system, sans-serif;
  letter-spacing: -0.02em;
  color: var(--ml-fg, #e8eaf2);
  text-shadow: 0 2px 24px color-mix(in oklab, var(--ml-accent, #7c8cff) 45%, transparent);
}

.parallax-layers__sub {
  margin: 0;
  font: 400 11.5px/1.4 system-ui, -apple-system, sans-serif;
  color: var(--ml-muted, #8b91a3);
}

/* Indice « faites défiler », épinglé en bas du scrollport */
.parallax-layers__hint {
  position: sticky;
  bottom: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 14px 0 10px;
  pointer-events: none;
  font: 500 10.5px/1 system-ui, -apple-system, sans-serif;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ml-muted, #8b91a3);
}

.parallax-layers__hint::after {
  content: "";
  width: 7px;
  height: 7px;
  margin-top: -4px;
  border-right: 1.5px solid var(--ml-accent, #7c8cff);
  border-bottom: 1.5px solid var(--ml-accent, #7c8cff);
  transform: rotate(45deg);
  animation: parallax-layers-nudge 1.5s ease-in-out infinite;
}

@keyframes parallax-layers-nudge {
  0%, 100% { transform: translateY(-2px) rotate(45deg); opacity: 0.55; }
  50%      { transform: translateY(2px) rotate(45deg); opacity: 1; }
}

/* ——— Scroll-driven (Chrome/Edge 115+, Safari 26+) ——— */

@supports (animation-timeline: scroll()) {
  .parallax-layers__layer {
    animation-name: parallax-layers-drift;
    animation-timing-function: linear;
    animation-fill-mode: both;
    animation-timeline: scroll(nearest);
  }

  .parallax-layers__caption {
    animation-name: parallax-layers-title-in;
    animation-timing-function: linear;
    animation-fill-mode: both;
    animation-timeline: scroll(nearest);
    animation-range: 12% 60%;
  }

  .parallax-layers__hint {
    animation-name: parallax-layers-hint-out;
    animation-timing-function: linear;
    animation-fill-mode: both;
    animation-timeline: scroll(nearest);
    animation-range: 0% 15%;
  }
}

@keyframes parallax-layers-drift {
  to { transform: translateY(var(--parallax-layers-shift, -40px)); }
}

@keyframes parallax-layers-title-in {
  from {
    opacity: 0;
    transform: translateY(16px) scale(0.96);
    filter: blur(8px);
  }
  to {
    opacity: 1;
    transform: none;
    filter: none;
  }
}

@keyframes parallax-layers-hint-out {
  to {
    opacity: 0;
    visibility: hidden;
  }
}

/* ——— Fallback (Firefox) : scène statique élégante, rien à défiler ——— */

@supports not (animation-timeline: scroll()) {
  .parallax-layers__spacer,
  .parallax-layers__hint {
    display: none;
  }
}

/* ——— Reduced motion : même scène statique, zéro mouvement ——— */

@media (prefers-reduced-motion: reduce) {
  .parallax-layers__spacer,
  .parallax-layers__hint {
    display: none;
  }
  .parallax-layers__layer,
  .parallax-layers__caption {
    animation: none;
  }
}