/* ============================================
   SCROLL ANIMATIONS
   ============================================ */

/* Base state — elements are invisible until observed */
[data-animate] {
  opacity: 0;
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
  transition-delay: var(--delay, 0ms);
}

[data-animate="fade-up"] {
  transform: translateY(32px);
}

[data-animate="fade-in"] {
  transform: none;
}

[data-animate="fade-left"] {
  transform: translateX(-32px);
}

[data-animate="fade-right"] {
  transform: translateX(32px);
}

[data-animate="scale-in"] {
  transform: scale(0.96);
}

/* Visible state */
[data-animate].is-visible {
  opacity: 1;
  transform: none;
}

/* ---- Keyframe animations ---- */

@keyframes shimmer {
  from { background-position: 200% center; }
  to   { background-position: -200% center; }
}

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

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}

/* ---- Loading skeleton ---- */

.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-surface) 25%,
    var(--color-surface-2) 50%,
    var(--color-surface) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
}

/* ---- Respect prefers-reduced-motion ---- */

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

  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}