/* ============================================
   ANIMATIONS & TRANSITIONS
   CSS animations + classes for Intersection Observer
   ============================================ */

/* ============================================
   SCROLL ANIMATIONS (Intersection Observer)
   ============================================ */

/* Fade In */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--duration-slow) var(--ease-out-expo),
              transform var(--duration-slow) var(--ease-out-expo);
}

.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Slide In from Left */
.slide-in-left {
  opacity: 0;
  transform: translateX(-50px);
  transition: opacity var(--duration-slower) var(--ease-out-expo),
              transform var(--duration-slower) var(--ease-out-expo);
}

.slide-in-left.is-visible {
  opacity: 1;
  transform: translateX(0);
}

/* Slide In from Right */
.slide-in-right {
  opacity: 0;
  transform: translateX(50px);
  transition: opacity var(--duration-slower) var(--ease-out-expo),
              transform var(--duration-slower) var(--ease-out-expo);
}

.slide-in-right.is-visible {
  opacity: 1;
  transform: translateX(0);
}

/* Scale In */
.scale-in {
  opacity: 0;
  transform: scale(0.8);
  transition: opacity var(--duration-slow) var(--ease-out-expo),
              transform var(--duration-slow) var(--ease-spring);
}

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

/* Stagger Items (used with JS) */
.stagger-item {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-slow) var(--ease-out-expo),
              transform var(--duration-slow) var(--ease-out-expo);
}

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

/* ============================================
   KEYFRAME ANIMATIONS
   ============================================ */

/* Fade In */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Slide Up */
@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Slide Down */
@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Scale */
@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.8);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Float */
@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-20px);
  }
}

/* Pulse */
@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.8;
    transform: scale(1.05);
  }
}

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

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

/* Bounce */
@keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

/* Shake */
@keyframes shake {
  0%, 100% {
    transform: translateX(0);
  }
  10%, 30%, 50%, 70%, 90% {
    transform: translateX(-5px);
  }
  20%, 40%, 60%, 80% {
    transform: translateX(5px);
  }
}

/* ============================================
   UTILITY ANIMATION CLASSES
   ============================================ */

.animate-fade-in {
  animation: fadeIn var(--duration-slow) var(--ease-out-expo);
}

.animate-slide-up {
  animation: slideUp var(--duration-slow) var(--ease-out-expo);
}

.animate-slide-down {
  animation: slideDown var(--duration-slow) var(--ease-out-expo);
}

.animate-scale-in {
  animation: scaleIn var(--duration-slow) var(--ease-spring);
}

.animate-float {
  animation: float 3s ease-in-out infinite;
}

.animate-pulse {
  animation: pulse 2s ease-in-out infinite;
}

.animate-spin {
  animation: spin 1s linear infinite;
}

.animate-bounce {
  animation: bounce 1s ease-in-out infinite;
}

.animate-shake {
  animation: shake 0.5s ease-in-out;
}

/* Animation Delays */
.delay-100 { animation-delay: 0.1s; }
.delay-200 { animation-delay: 0.2s; }
.delay-300 { animation-delay: 0.3s; }
.delay-400 { animation-delay: 0.4s; }
.delay-500 { animation-delay: 0.5s; }
.delay-600 { animation-delay: 0.6s; }
.delay-700 { animation-delay: 0.7s; }
.delay-800 { animation-delay: 0.8s; }

/* ============================================
   HOVER EFFECTS
   ============================================ */

/* Lift on Hover */
.hover-lift {
  transition: transform var(--duration-normal) var(--ease-out-expo),
              box-shadow var(--duration-normal) var(--ease-out-expo);
}

.hover-lift:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
}

/* Scale on Hover */
.hover-scale {
  transition: transform var(--duration-normal) var(--ease-out-expo);
}

.hover-scale:hover {
  transform: scale(1.05);
}

/* Brightness on Hover */
.hover-brightness:hover {
  filter: brightness(1.1);
}

/* Glow on Hover */
.hover-glow {
  transition: box-shadow var(--duration-normal) var(--ease-out-expo);
}

.hover-glow:hover {
  box-shadow: 0 0 20px rgba(46, 139, 192, 0.4);
}

/* ============================================
   LOADING STATES
   ============================================ */

/* Skeleton Loader */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-neutral-200) 0%,
    var(--color-neutral-300) 20%,
    var(--color-neutral-200) 40%,
    var(--color-neutral-200) 100%
  );
  background-size: 1000px 100%;
  animation: shimmer 2s linear infinite;
  border-radius: var(--radius-md);
}

.skeleton-text {
  height: 1em;
  margin-bottom: 0.5em;
}

.skeleton-title {
  height: 2em;
  width: 60%;
  margin-bottom: 1em;
}

.skeleton-circle {
  width: 100px;
  height: 100px;
  border-radius: var(--radius-full);
}

/* Pulsing Dot */
.pulsing-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--color-primary-600);
  animation: pulse 2s ease-in-out infinite;
}

/* ============================================
   PAGE TRANSITIONS
   ============================================ */

body {
  animation: fadeIn var(--duration-normal) var(--ease-out);
}

/* ============================================
   REDUCED MOTION
   ============================================ */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .fade-in,
  .slide-in-left,
  .slide-in-right,
  .scale-in,
  .stagger-item {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .fade-in.is-visible,
  .slide-in-left.is-visible,
  .slide-in-right.is-visible,
  .scale-in.is-visible,
  .stagger-item.is-visible {
    opacity: 1;
    transform: none;
  }
}

/* ============================================
   PARALLAX ELEMENTS
   ============================================ */

.parallax-slow {
  will-change: transform;
  transition: transform 0.1s linear;
}

.parallax-medium {
  will-change: transform;
  transition: transform 0.15s linear;
}

.parallax-fast {
  will-change: transform;
  transition: transform 0.2s linear;
}