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

@keyframes fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

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

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

@keyframes slide-left {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slide-right {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

@keyframes shimmer {
  0% {
    background-position: -1000px 0;
  }
  100% {
    background-position: 1000px 0;
  }
}

@keyframes ripple {
  0% {
    transform: scale(0);
    opacity: 0.6;
  }
  100% {
    transform: scale(2.5);
    opacity: 0;
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

/* Counter animation */
@keyframes counter-up {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* =========================================================
   UTILITY CLASSES FOR SCROLL ANIMATIONS
   ========================================================= */

/* Base state - elements are VISIBLE by default (progressive enhancement) */
.animate-on-scroll {
  opacity: 1;
}

/* Only hide if JS is ready (body gets .js-ready class) */
body.js-ready .animate-on-scroll:not(.is-visible) {
  opacity: 0;
}

/* When element becomes visible */
.animate-on-scroll.is-visible {
  animation-fill-mode: forwards;
  opacity: 1;
}

/* Animation variants */
.fade-in.is-visible {
  animation: fade-in var(--duration-slow) var(--ease-smooth);
}

.slide-up.is-visible {
  animation: slide-up var(--duration-slow) var(--ease-smooth);
}

.slide-down.is-visible {
  animation: slide-down var(--duration-slow) var(--ease-smooth);
}

.slide-left.is-visible {
  animation: slide-left var(--duration-slow) var(--ease-smooth);
}

.slide-right.is-visible {
  animation: slide-right var(--duration-slow) var(--ease-smooth);
}

.scale-in.is-visible {
  animation: scale-in var(--duration-slow) var(--ease-smooth);
}

/* Stagger delays for sequential animations */
.stagger-1 {
  animation-delay: var(--stagger-1);
}

.stagger-2 {
  animation-delay: var(--stagger-2);
}

.stagger-3 {
  animation-delay: var(--stagger-3);
}

.stagger-4 {
  animation-delay: var(--stagger-4);
}

/* Custom delays */
.delay-100 {
  animation-delay: 100ms;
}

.delay-200 {
  animation-delay: 200ms;
}

.delay-300 {
  animation-delay: 300ms;
}

.delay-400 {
  animation-delay: 400ms;
}

.delay-500 {
  animation-delay: 500ms;
}

/* =========================================================
   SPECIAL EFFECTS
   ========================================================= */

/* Parallax effect - applied by JS */
.parallax {
  transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* Reveal animation container */
.reveal-container {
  overflow: hidden;
}

.reveal-item {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--duration-slow) var(--ease-smooth),
              transform var(--duration-slow) var(--ease-smooth);
}

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

/* Loading spinner (optional) */
@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.spinner {
  animation: spin 1s linear infinite;
}

/* =========================================================
   ACCESSIBILITY - RESPECT USER PREFERENCES
   ========================================================= */

/* Disable animations for users who prefer reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .animate-on-scroll {
    opacity: 1;
  }

  .parallax {
    transform: none !important;
  }
}