/**
 * v1.0.5 Animation System
 * Sophisticated animations that enhance, not distract
 *
 * Philosophy: Animations should feel natural, purposeful, and polished.
 * Every motion guides the eye and reinforces the information hierarchy.
 */

/* ==========================================================================
   Gradient Animations (Hero Background)
   ========================================================================== */

@keyframes gradient-shift {
  0%, 100% {
    opacity: 1;
    transform: scale(1) rotate(0deg);
  }
  33% {
    opacity: 0.9;
    transform: scale(1.05) rotate(1deg);
  }
  66% {
    opacity: 0.85;
    transform: scale(1.1) rotate(-1deg);
  }
}

@keyframes gradient-pulse {
  0%, 100% {
    opacity: 0.3;
  }
  50% {
    opacity: 0.5;
  }
}

/* Subtle parallax effect for hero background */
@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
}

/* ==========================================================================
   Counter Animations (Metrics)
   ========================================================================== */

/* Pulsing highlight when counter animates */
@keyframes counter-highlight {
  0%, 100% {
    text-shadow: 0 0 0 transparent;
  }
  50% {
    text-shadow: 0 0 20px rgba(181, 103, 78, 0.4);
  }
}

/* ==========================================================================
   Card Animations (Category Cards, App Cards)
   ========================================================================== */

/* Card entrance animation */
@keyframes card-enter {
  0% {
    opacity: 0;
    transform: translateY(30px) scale(0.95);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* Card hover lift effect */
.card-interactive {
  transition: transform var(--transition-base) var(--ease-out),
              box-shadow var(--transition-base) var(--ease-out),
              border-color var(--transition-base) var(--ease-out);
}

.card-interactive:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

.card-interactive:active {
  transform: translateY(-3px);
  transition-duration: 100ms;
}

/* Icon rotation on hover */
.icon-rotate {
  transition: transform var(--transition-base) var(--ease-bounce);
}

.card-interactive:hover .icon-rotate {
  transform: rotate(5deg) scale(1.1);
}

/* ==========================================================================
   Expand/Collapse Animations
   ========================================================================== */

.expandable-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow) var(--ease-in-out),
              opacity var(--transition-base) var(--ease-out);
  opacity: 0;
}

.expandable-content--expanded {
  opacity: 1;
}

/* Chevron rotation */
.chevron {
  transition: transform var(--transition-base) var(--ease-out);
}

.chevron--expanded {
  transform: rotate(180deg);
}

/* ==========================================================================
   Search Bar Animations
   ========================================================================== */

/* Search bar slide in from top */
@keyframes slide-in-top {
  0% {
    opacity: 0;
    transform: translateY(-20px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Search results fade in */
@keyframes search-results-appear {
  0% {
    opacity: 0;
    transform: translateY(10px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Highlight matching text */
@keyframes highlight-flash {
  0%, 100% {
    background-color: transparent;
  }
  50% {
    background-color: rgba(181, 103, 78, 0.2);
  }
}

.search-highlight {
  animation: highlight-flash 1s ease-in-out;
  background-color: rgba(181, 103, 78, 0.15);
  padding: 0 2px;
  border-radius: 2px;
}

/* ==========================================================================
   Button Animations
   ========================================================================== */

.button {
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base) var(--ease-out);
}

/* Ripple effect on click */
.button::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  transform: translate(-50%, -50%);
  transition: width var(--transition-slow) var(--ease-out),
              height var(--transition-slow) var(--ease-out),
              opacity var(--transition-slower) var(--ease-out);
  opacity: 0;
}

.button:active::after {
  width: 300px;
  height: 300px;
  opacity: 1;
  transition-duration: 0ms;
}

/* Shimmer effect for primary buttons */
@keyframes shimmer {
  0% {
    background-position: -200% center;
  }
  100% {
    background-position: 200% center;
  }
}

.button--shimmer {
  background: linear-gradient(
    90deg,
    var(--color-rust) 0%,
    var(--color-rust-light) 50%,
    var(--color-rust) 100%
  );
  background-size: 200% auto;
  animation: shimmer 3s linear infinite;
}

.button--shimmer:hover {
  animation: none;
  background: var(--color-rust-light);
}

/* ==========================================================================
   Badge Animations
   ========================================================================== */

/* Badge pulse for NEW items */
@keyframes badge-pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

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

/* Badge entrance */
@keyframes badge-enter {
  0% {
    opacity: 0;
    transform: scale(0) rotate(-12deg);
  }
  50% {
    transform: scale(1.1) rotate(3deg);
  }
  100% {
    opacity: 1;
    transform: scale(1) rotate(0);
  }
}

.badge {
  animation: badge-enter var(--transition-base) var(--ease-bounce);
}

/* ==========================================================================
   Loading States
   ========================================================================== */

/* Skeleton loading animation */
@keyframes skeleton-loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-light-gray) 0%,
    var(--color-off-white) 50%,
    var(--color-light-gray) 100%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

/* Spinner animation */
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-light-gray);
  border-top-color: var(--color-rust);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* Dots loading animation */
@keyframes dot-pulse {
  0%, 80%, 100% {
    opacity: 0.3;
    transform: scale(1);
  }
  40% {
    opacity: 1;
    transform: scale(1.2);
  }
}

.loading-dots span {
  display: inline-block;
  width: 8px;
  height: 8px;
  margin: 0 4px;
  background-color: var(--color-rust);
  border-radius: 50%;
  animation: dot-pulse 1.4s ease-in-out infinite;
}

.loading-dots span:nth-child(1) {
  animation-delay: 0ms;
}

.loading-dots span:nth-child(2) {
  animation-delay: 160ms;
}

.loading-dots span:nth-child(3) {
  animation-delay: 320ms;
}

/* ==========================================================================
   Scroll Animations
   ========================================================================== */

/* Fade in on scroll (triggered by Intersection Observer) */
.fade-in-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s var(--ease-out),
              transform 0.6s var(--ease-out);
}

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

/* Slide in from left on scroll */
.slide-in-left {
  opacity: 0;
  transform: translateX(-50px);
  transition: opacity 0.6s var(--ease-out),
              transform 0.6s var(--ease-out);
}

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

/* Slide in from right on scroll */
.slide-in-right {
  opacity: 0;
  transform: translateX(50px);
  transition: opacity 0.6s var(--ease-out),
              transform 0.6s var(--ease-out);
}

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

/* ==========================================================================
   Reduced Motion Support
   ========================================================================== */

/* Respect user's motion preferences */
@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;
  }

  .gradient-shift,
  .gradient-pulse,
  .float,
  .shimmer,
  .badge-pulse {
    animation: none !important;
  }
}

/* ==========================================================================
   Performance Optimizations
   ========================================================================== */

/* Promote animated elements to their own layer for better performance */
.will-animate {
  will-change: transform, opacity;
}

/* Remove will-change after animation completes to free up resources */
.animation-complete {
  will-change: auto;
}