/* ============================================================
   ANIMATIONS — Scroll reveals, hover states, reduced motion
   ============================================================ */


/* ---- Scroll Reveal ---- */

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition:
    opacity 0.5s var(--ease-out),
    transform 0.5s var(--ease-out);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Card stagger via CSS custom property */
.card.reveal,
.roadmap-step.reveal {
  transition-delay: var(--stagger, 0s);
}

/* Grid stagger — auto-assigned */
.card-grid .card:nth-child(1) { --stagger: 0s; }
.card-grid .card:nth-child(2) { --stagger: 0.04s; }
.card-grid .card:nth-child(3) { --stagger: 0.08s; }
.card-grid .card:nth-child(4) { --stagger: 0.12s; }
.card-grid .card:nth-child(5) { --stagger: 0.16s; }
.card-grid .card:nth-child(6) { --stagger: 0.20s; }
.card-grid .card:nth-child(7) { --stagger: 0.24s; }
.card-grid .card:nth-child(8) { --stagger: 0.28s; }
.card-grid .card:nth-child(9) { --stagger: 0.32s; }

.roadmap .roadmap-step:nth-child(1) { --stagger: 0s; }
.roadmap .roadmap-step:nth-child(2) { --stagger: 0.06s; }
.roadmap .roadmap-step:nth-child(3) { --stagger: 0.12s; }
.roadmap .roadmap-step:nth-child(4) { --stagger: 0.18s; }
.roadmap .roadmap-step:nth-child(5) { --stagger: 0.24s; }
.roadmap .roadmap-step:nth-child(6) { --stagger: 0.30s; }


/* ---- Header Stagger ---- */

.header-label.reveal.visible  { transition-delay: 0s; }
.header h1.reveal.visible      { transition-delay: 0.06s; }
.header-desc.reveal.visible    { transition-delay: 0.12s; }
.header-meta.reveal.visible    { transition-delay: 0.2s; }


/* ---- Timeline Reveal ---- */

.timeline-item.reveal {
  opacity: 0;
  transform: translateX(-10px);
}
.timeline-item.reveal.visible {
  opacity: 1;
  transform: translateX(0);
}


/* ---- Focus States ---- */

.nav-btn:focus-visible,
.concept-chip:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}


/* ---- Reduced Motion ---- */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}