/* ============================================================
   ANIMATIONS — Scroll-triggered animations & keyframes
   ============================================================ */

/* ============================================================
   ANIMATION KEYFRAMES
   ============================================================ */

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

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

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* ============================================================
   ANIMATION TARGETS — Default (hidden) state
   ============================================================ */

[data-animation] {
  opacity: 0;
  will-change: opacity, transform;
}

[data-animation="fade-up"] {
  transform: translateY(30px);
}

[data-animation="fade-in"] {
  opacity: 0;
}

[data-animation="slide-left"] {
  transform: translateX(-40px);
}

[data-animation="slide-right"] {
  transform: translateX(40px);
}

[data-animation="scale-in"] {
  transform: scale(0.95);
}

/* ============================================================
   VISIBLE STATE — Applied by JavaScript after intersection
   ============================================================ */

[data-animation].is-visible {
  opacity: 1;
  transform: none;
}

[data-animation="fade-up"].is-visible {
  animation: fadeUp var(--transition-base) ease-out forwards;
}

[data-animation="fade-in"].is-visible {
  animation: fadeIn var(--transition-base) ease-out forwards;
}

[data-animation="slide-left"].is-visible {
  animation: slideInLeft var(--transition-base) ease-out forwards;
}

[data-animation="slide-right"].is-visible {
  animation: slideInRight var(--transition-base) ease-out forwards;
}

[data-animation="scale-in"].is-visible {
  animation: scaleIn var(--transition-base) ease-out forwards;
}

/* ============================================================
   STAGGERED DELAYS — Applied via data-delay attribute
   ============================================================ */

/*
  Usage: <element data-animation="fade-up" data-delay="0">
         <element data-animation="fade-up" data-delay="1">
         <element data-animation="fade-up" data-delay="2">

  Delays calculated as: delay-index * 100ms
*/

[data-delay="0"].is-visible {
  animation-delay: 0ms;
}

[data-delay="1"].is-visible {
  animation-delay: 100ms;
}

[data-delay="2"].is-visible {
  animation-delay: 200ms;
}

[data-delay="3"].is-visible {
  animation-delay: 300ms;
}

[data-delay="4"].is-visible {
  animation-delay: 400ms;
}

[data-delay="5"].is-visible {
  animation-delay: 500ms;
}

[data-delay="6"].is-visible {
  animation-delay: 600ms;
}

[data-delay="7"].is-visible {
  animation-delay: 700ms;
}

[data-delay="8"].is-visible {
  animation-delay: 800ms;
}

[data-delay="9"].is-visible {
  animation-delay: 900ms;
}

/* ============================================================
   REDUCE MOTION SUPPORT (Accessibility)
   ============================================================ */

@media (prefers-reduced-motion: reduce) {
  [data-animation],
  [data-animation].is-visible {
    opacity: 1;
    transform: none;
    animation: none;
  }
}