/* ============================================
   NEXR ARTS — Animations
   ============================================ */

/* --- Fade In Up (default scroll reveal) --- */

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-slower) var(--ease-out-expo),
              transform var(--transition-slower) var(--ease-out-expo);
}

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

/* --- Fade In (no translate) --- */

.fade-in--flat {
  opacity: 0;
  transition: opacity var(--transition-slower) var(--ease-out-expo);
}

.fade-in--flat.is-visible {
  opacity: 1;
}

/* --- Stagger Children --- */

.stagger-children .fade-in:nth-child(1) { transition-delay: 0ms; }
.stagger-children .fade-in:nth-child(2) { transition-delay: 100ms; }
.stagger-children .fade-in:nth-child(3) { transition-delay: 200ms; }
.stagger-children .fade-in:nth-child(4) { transition-delay: 300ms; }
.stagger-children .fade-in:nth-child(5) { transition-delay: 400ms; }
.stagger-children .fade-in:nth-child(6) { transition-delay: 500ms; }

/* --- Slide In Left --- */

.slide-in-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity var(--transition-slower) var(--ease-out-expo),
              transform var(--transition-slower) var(--ease-out-expo);
}

.slide-in-left.is-visible {
  opacity: 1;
  transform: translateX(0);
}

/* --- Slide In Right --- */

.slide-in-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity var(--transition-slower) var(--ease-out-expo),
              transform var(--transition-slower) var(--ease-out-expo);
}

.slide-in-right.is-visible {
  opacity: 1;
  transform: translateX(0);
}

/* --- Scale In --- */

.scale-in {
  opacity: 0;
  transform: scale(0.95);
  transition: opacity var(--transition-slower) var(--ease-out-expo),
              transform var(--transition-slower) var(--ease-out-expo);
}

.scale-in.is-visible {
  opacity: 1;
  transform: scale(1);
}

/* --- Line Reveal --- */

.line-reveal {
  width: 0;
  transition: width 1s var(--ease-out-expo);
}

.line-reveal.is-visible {
  width: 40px;
}

/* --- KV specific animations --- */

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

@keyframes kv-line-expand {
  from { width: 0; }
  to { width: 60px; }
}

@keyframes scroll-indicator {
  0%, 100% {
    opacity: 0;
    transform: translateY(0);
  }
  50% {
    opacity: 1;
    transform: translateY(8px);
  }
}

/* Prefers reduced motion */
@media (prefers-reduced-motion: reduce) {
  .fade-in,
  .fade-in--flat,
  .slide-in-left,
  .slide-in-right,
  .scale-in {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .line-reveal {
    width: 40px;
    transition: none;
  }
}