/* ============================================
   ANIMATIONS.CSS — Transitions & Keyframes
   ============================================ */

/* Keyframes */

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

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

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

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

/* Utility animation classes */

.animate-fade-in       { animation: fadeIn var(--transition-base) ease-out both; }
.animate-fade-in-down  { animation: fadeInDown var(--transition-base) ease-out both; }
.animate-fade-in-up    { animation: fadeInUp var(--transition-base) ease-out both; }
.animate-scale-in      { animation: scaleIn var(--transition-fast) ease-out both; }

/* Skeleton loading */

.skeleton {
  background: linear-gradient(
    90deg,
    var(--surface-raised) 25%,
    var(--border)         50%,
    var(--surface-raised) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

/* Stagger delays */

.stagger > *:nth-child(1) { animation-delay: 0ms; }
.stagger > *:nth-child(2) { animation-delay: 50ms; }
.stagger > *:nth-child(3) { animation-delay: 100ms; }
.stagger > *:nth-child(4) { animation-delay: 150ms; }
.stagger > *:nth-child(5) { animation-delay: 200ms; }