/* ============================================================
   ZERO DRIVER — Animations & Scroll Reveals
   Classes managed by premium.js
   ============================================================ */

/* ── KEYFRAMES ───────────────────────────────────────────── */
@keyframes zd-fade-up {
  from { opacity: 0; transform: translateY(32px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes zd-fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes zd-slide-left {
  from { opacity: 0; transform: translateX(40px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes zd-slide-right {
  from { opacity: 0; transform: translateX(-40px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes zd-shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position:  200% 0; }
}

/* ── SCROLL REVEAL — initial hidden state ────────────────── */
.zd-reveal,
.zd-reveal--fade,
.zd-reveal--left,
.zd-reveal--right {
  opacity: 0;
  transition:
    opacity var(--duration-slow) var(--ease-cinematic),
    transform var(--duration-slow) var(--ease-cinematic);
}

.zd-reveal         { transform: translateY(24px); }
.zd-reveal--fade   { transform: none; }
.zd-reveal--left   { transform: translateX(32px); }
.zd-reveal--right  { transform: translateX(-32px); }

/* Visible state — added by IntersectionObserver */
.zd-reveal.is-visible,
.zd-reveal--fade.is-visible,
.zd-reveal--left.is-visible,
.zd-reveal--right.is-visible {
  opacity: 1;
  transform: none;
}

/* ── STAGGER GROUP — children cascade in ────────────────── */
.zd-reveal-group > * {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity var(--duration-slow) var(--ease-cinematic),
    transform var(--duration-slow) var(--ease-cinematic);
}

.zd-reveal-group.is-visible > *:nth-child(1) { transition-delay: 0ms; }
.zd-reveal-group.is-visible > *:nth-child(2) { transition-delay: 100ms; }
.zd-reveal-group.is-visible > *:nth-child(3) { transition-delay: 200ms; }
.zd-reveal-group.is-visible > *:nth-child(4) { transition-delay: 300ms; }
.zd-reveal-group.is-visible > *:nth-child(5) { transition-delay: 400ms; }
.zd-reveal-group.is-visible > *:nth-child(6) { transition-delay: 500ms; }

.zd-reveal-group.is-visible > * {
  opacity: 1;
  transform: none;
}

/* ── REDUCED MOTION ──────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .zd-reveal,
  .zd-reveal--fade,
  .zd-reveal--left,
  .zd-reveal--right,
  .zd-reveal-group > * {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

/* ── GOLD SHIMMER (loading states) ──────────────────────── */
.zd-shimmer {
  background: linear-gradient(
    90deg,
    var(--color-surface-low) 25%,
    var(--color-surface-high) 50%,
    var(--color-surface-low) 75%
  );
  background-size: 200% 100%;
  animation: zd-shimmer 1.5s infinite;
}