/* ============================================================
   ScoreIndexer — Animations (stylesheet 4 of 4)
   Scroll-reveal, micro-interactions, and stagger effects.
   All gated by prefers-reduced-motion in base.css.
   ============================================================ */

/* --- Scroll reveal ----------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children inside a grid */
.reveal-stagger > .card { opacity: 0; transform: translateY(16px); }
.reveal-stagger.is-visible > .card {
  opacity: 1;
  transform: translateY(0);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}
.reveal-stagger.is-visible > .card:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger.is-visible > .card:nth-child(2) { transition-delay: 80ms; }
.reveal-stagger.is-visible > .card:nth-child(3) { transition-delay: 160ms; }
.reveal-stagger.is-visible > .card:nth-child(4) { transition-delay: 240ms; }
.reveal-stagger.is-visible > .card:nth-child(5) { transition-delay: 320ms; }
.reveal-stagger.is-visible > .card:nth-child(6) { transition-delay: 400ms; }

/* --- Hero entrance ----------------------------------------- */
@keyframes hero-fade-in {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
.hero-animate > * {
  animation: hero-fade-in 0.7s var(--ease-out) both;
}
.hero-animate > *:nth-child(1) { animation-delay: 0.05s; }
.hero-animate > *:nth-child(2) { animation-delay: 0.15s; }
.hero-animate > *:nth-child(3) { animation-delay: 0.25s; }
.hero-animate > *:nth-child(4) { animation-delay: 0.35s; }
.hero-animate > *:nth-child(5) { animation-delay: 0.45s; }

/* --- Floating pulse on brand mark -------------------------- */
@keyframes brand-pulse {
  0%, 100% { box-shadow: 0 0 0 0 var(--c-accent-glow); }
  50%      { box-shadow: 0 0 0 6px transparent; }
}
.brand:hover .brand__mark {
  animation: brand-pulse 1.2s ease-in-out;
}

/* --- Subtle shimmer on hero gradient ----------------------- */
@keyframes hero-gradient-shift {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}