/* ==========================================================================
   Animations & Scroll Reveal
   ========================================================================== */

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

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fade-down {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scale-in {
  from {
    opacity: 0;
    transform: scale(0.94);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

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

@keyframes pulse-ring {
  0% { box-shadow: 0 0 0 0 rgba(var(--color-primary-rgb), 0.45); }
  100% { box-shadow: 0 0 0 16px rgba(var(--color-primary-rgb), 0); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes float-y {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* ---- Scroll-reveal base state ---- */
/* Elements get [data-reveal] in HTML; JS (animations.js) toggles .is-visible
   via IntersectionObserver. Hidden state only applies once JS confirms it
   can run, preventing content from being stuck invisible without JS. */
.js-enabled [data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 700ms var(--ease-out), transform 700ms var(--ease-out);
  will-change: opacity, transform;
}

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

.js-enabled [data-reveal-scale] {
  opacity: 0;
  transform: scale(0.94);
  transition: opacity 700ms var(--ease-out), transform 700ms var(--ease-out);
}

.js-enabled [data-reveal-scale].is-visible {
  opacity: 1;
  transform: scale(1);
}

.js-enabled [data-reveal-stagger] > * {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 600ms var(--ease-out), transform 600ms var(--ease-out);
}

.js-enabled [data-reveal-stagger].is-visible > * {
  opacity: 1;
  transform: translateY(0);
}

.js-enabled [data-reveal-stagger].is-visible > *:nth-child(1) { transition-delay: 0ms; }
.js-enabled [data-reveal-stagger].is-visible > *:nth-child(2) { transition-delay: 90ms; }
.js-enabled [data-reveal-stagger].is-visible > *:nth-child(3) { transition-delay: 180ms; }
.js-enabled [data-reveal-stagger].is-visible > *:nth-child(4) { transition-delay: 270ms; }
.js-enabled [data-reveal-stagger].is-visible > *:nth-child(5) { transition-delay: 360ms; }
.js-enabled [data-reveal-stagger].is-visible > *:nth-child(6) { transition-delay: 450ms; }

/* ---- Utility animation classes ---- */
.anim-fade-in { animation: fade-in var(--transition-slow) both; }
.anim-fade-up { animation: fade-up var(--transition-slow) both; }
.anim-spin { animation: spin 900ms linear infinite; }
.anim-float { animation: float-y 6s var(--ease-in-out) infinite; }

/* Respect user motion preference: disable non-essential motion */
@media (prefers-reduced-motion: reduce) {
  .js-enabled [data-reveal],
  .js-enabled [data-reveal-scale],
  .js-enabled [data-reveal-stagger] > * {
    opacity: 1;
    transform: none;
    transition: none;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}