/* =========================================================
   BEAUTY PLUZ — ANIMATIONS
   Motion is used sparingly: soft reveals and gentle
   micro-interactions, never bouncy or attention-grabbing.
   All keyframes respect prefers-reduced-motion via the
   global rule already set in style.css.
   ========================================================= */

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

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fade-down {
  from {
    opacity: 0;
    transform: translateY(-16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scale-in {
  from {
    opacity: 0;
    transform: scale(0.96);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes drift {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-6px);
  }
}

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

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

@keyframes cart-bump {
  0% {
    transform: scale(1);
  }
  40% {
    transform: scale(1.35);
  }
  100% {
    transform: scale(1);
  }
}

/* -----------------------------
   Utility classes
   Applied via JS (e.g. IntersectionObserver in main.js)
   or directly in markup for on-load elements.
------------------------------ */
.animate-fade-in {
  animation: fade-in var(--duration-slow) var(--ease-out) both;
}

.animate-fade-up {
  animation: fade-up var(--duration-slow) var(--ease-out) both;
}

.animate-fade-down {
  animation: fade-down var(--duration-slow) var(--ease-out) both;
}

.animate-scale-in {
  animation: scale-in var(--duration-base) var(--ease-out) both;
}

/* Scroll-reveal pattern: JS toggles .is-visible when an element
   enters the viewport. Element is hidden/offset until then. */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--duration-slow) var(--ease-out),
    transform var(--duration-slow) var(--ease-out);
}

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

/* Stagger helpers for groups of revealed items */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--duration-slow) var(--ease-out),
    transform var(--duration-slow) var(--ease-out);
}

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

.reveal-stagger.is-visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* Loading skeleton shimmer, for async product/cart content */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--clr-ivory-deep) 25%,
    var(--clr-white) 50%,
    var(--clr-ivory-deep) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.6s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

.spin {
  animation: spin 900ms linear infinite;
}

.drift {
  animation: drift 4s var(--ease-in-out) infinite;
}

@media (prefers-reduced-motion: reduce) {
  .reveal,
  .reveal-stagger > * {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .skeleton,
  .spin,
  .drift {
    animation: none;
  }
}