/* ==========================================================================
   Animations — scroll reveals, hero motion, micro-interactions
   Paired with js/animations.js (IntersectionObserver adds .is-visible)
   ========================================================================== */

[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--duration-slow) var(--ease-spring), transform var(--duration-slow) var(--ease-spring);
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children of a [data-reveal-group] using an inline --delay set by JS */
[data-reveal-child] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-base) var(--ease-spring), transform var(--duration-base) var(--ease-spring);
  transition-delay: var(--delay, 0ms);
}

[data-reveal-child].is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  [data-reveal],
  [data-reveal-child] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---- Hero mark: gentle perpetual float + scroll-driven transform ---- */

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-14px) rotate(2deg); }
}

.hero__mark {
  animation: float 6s ease-in-out infinite;
}

@media (prefers-reduced-motion: reduce) {
  .hero__mark {
    animation: none;
  }
}

/* JS sets --scroll-progress (0-1) on .hero__stage while the hero is in view */
.hero__stage {
  --scroll-progress: 0;
}

.hero__stage .hero__mark {
  transform: translateY(calc(var(--scroll-progress) * -40px)) scale(calc(1 - var(--scroll-progress) * 0.12))
             rotate(calc(var(--scroll-progress) * 18deg));
}

/* ---- Mobile nav burger ---- */

.nav.is-open .nav__burger span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav.is-open .nav__burger span:nth-child(2) {
  opacity: 0;
}

.nav.is-open .nav__burger span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ---- Subtle background drift on dark sections ---- */

@keyframes drift {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(2%, -2%) scale(1.05); }
  100% { transform: translate(0, 0) scale(1); }
}

.section-dark {
  position: relative;
  overflow: hidden;
}

.section-dark::before {
  content: "";
  position: absolute;
  inset: -10%;
  background: radial-gradient(circle at 30% 20%, color-mix(in srgb, var(--color-accent) 10%, transparent), transparent 55%);
  animation: drift 14s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}

.section-dark > * {
  position: relative;
  z-index: 1;
}