/* ============================================================
   ANIMATIONS — Reusable keyframes and reveal classes
   ============================================================ */

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

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

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

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.94);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

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

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

@keyframes bounce {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(8px);
  }
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

@keyframes drawLine {
  from {
    stroke-dashoffset: 400;
  }
  to {
    stroke-dashoffset: 0;
  }
}

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

/* --- Reveal on Scroll (IntersectionObserver adds .visible) --- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity var(--transition-reveal),
    transform var(--transition-reveal);
}

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

.reveal--left {
  opacity: 0;
  transform: translateX(-28px);
  transition:
    opacity var(--transition-reveal),
    transform var(--transition-reveal);
}

.reveal--left.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal--right {
  opacity: 0;
  transform: translateX(28px);
  transition:
    opacity var(--transition-reveal),
    transform var(--transition-reveal);
}

.reveal--right.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal--scale {
  opacity: 0;
  transform: scale(0.95);
  transition:
    opacity var(--transition-reveal),
    transform var(--transition-reveal);
}

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

/* Staggered children delays */
.stagger > *:nth-child(1) {
  transition-delay: 0ms;
}
.stagger > *:nth-child(2) {
  transition-delay: 80ms;
}
.stagger > *:nth-child(3) {
  transition-delay: 160ms;
}
.stagger > *:nth-child(4) {
  transition-delay: 240ms;
}
.stagger > *:nth-child(5) {
  transition-delay: 320ms;
}
.stagger > *:nth-child(6) {
  transition-delay: 400ms;
}

/* --- Shimmer skeleton (image loading placeholder) --- */
.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 infinite;
}

/* --- Utility animation classes --- */
.anim-bounce {
  animation: bounce 1.8s ease-in-out infinite;
}
.anim-pulse {
  animation: pulse 2s ease-in-out infinite;
}
.anim-fade-in {
  animation: fadeIn 0.6s ease forwards;
}
.anim-fade-up {
  animation: fadeUp 0.7s ease forwards;
}
.anim-scale-in {
  animation: scaleIn 0.5s ease forwards;
}

/* Respect reduced-motion preference */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .reveal,
  .reveal--left,
  .reveal--right,
  .reveal--scale {
    opacity: 1;
    transform: none;
  }
}