/**
 * AECS4U Animation System
 * Smooth animations and micro-interactions
 * Version: 2.0.0
 * Date: 2025-10-04
 *
 * Dependencies: design-tokens.css
 */

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

/* Fade Animations */
@keyframes fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

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

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

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

@keyframes fade-in-left {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fade-in-right {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Scale Animations */
@keyframes scale-up {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes scale-down {
  from {
    opacity: 0;
    transform: scale(1.1);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Slide Animations */
@keyframes slide-in-left {
  from {
    transform: translateX(-100%);
  }
  to {
    transform: translateX(0);
  }
}

@keyframes slide-in-right {
  from {
    transform: translateX(100%);
  }
  to {
    transform: translateX(0);
  }
}

@keyframes slide-in-up {
  from {
    transform: translateY(100%);
  }
  to {
    transform: translateY(0);
  }
}

@keyframes slide-in-down {
  from {
    transform: translateY(-100%);
  }
  to {
    transform: translateY(0);
  }
}

/* Bounce Animations */
@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-10px);
  }
  60% {
    transform: translateY(-5px);
  }
}

@keyframes bounce-in {
  0% {
    opacity: 0;
    transform: scale(0.3);
  }
  50% {
    opacity: 1;
    transform: scale(1.05);
  }
  70% {
    transform: scale(0.9);
  }
  100% {
    transform: scale(1);
  }
}

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

/* Pulse Animation */
@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

@keyframes pulse-scale {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

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

/* Wiggle Animation */
@keyframes wiggle {
  0%, 100% {
    transform: rotate(0deg);
  }
  25% {
    transform: rotate(-10deg);
  }
  75% {
    transform: rotate(10deg);
  }
}

/* Glow Animation */
@keyframes glow {
  0%, 100% {
    box-shadow: 0 0 5px var(--color-primary-500);
  }
  50% {
    box-shadow: 0 0 20px var(--color-primary-500);
  }
}

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

/* Progress Bar */
@keyframes progress {
  from {
    transform: scaleX(0);
  }
  to {
    transform: scaleX(1);
  }
}

/* Heart Beat */
@keyframes heart-beat {
  0%, 100% {
    transform: scale(1);
  }
  10%, 30% {
    transform: scale(1.2);
  }
  20%, 40% {
    transform: scale(1);
  }
}

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

/* Fade Animations */
.animate-fade-in {
  animation: fade-in var(--duration-300) var(--ease-out);
}

.animate-fade-out {
  animation: fade-out var(--duration-300) var(--ease-in);
}

.animate-fade-in-up {
  animation: fade-in-up var(--duration-500) var(--ease-out);
}

.animate-fade-in-down {
  animation: fade-in-down var(--duration-500) var(--ease-out);
}

.animate-fade-in-left {
  animation: fade-in-left var(--duration-500) var(--ease-out);
}

.animate-fade-in-right {
  animation: fade-in-right var(--duration-500) var(--ease-out);
}

/* Scale Animations */
.animate-scale-up {
  animation: scale-up var(--duration-300) var(--ease-out);
}

.animate-scale-down {
  animation: scale-down var(--duration-300) var(--ease-out);
}

/* Bounce Animations */
.animate-bounce {
  animation: bounce var(--duration-1000) var(--ease-in-out) infinite;
}

.animate-bounce-in {
  animation: bounce-in var(--duration-500) var(--ease-out);
}

/* Shake Animation */
.animate-shake {
  animation: shake var(--duration-500) var(--ease-in-out);
}

/* Pulse Animations */
.animate-pulse {
  animation: pulse var(--duration-1000) var(--ease-in-out) infinite;
}

.animate-pulse-scale {
  animation: pulse-scale var(--duration-1000) var(--ease-in-out) infinite;
}

/* Spin Animation */
.animate-spin {
  animation: spin var(--duration-1000) linear infinite;
}

.animate-spin-slow {
  animation: spin 3s linear infinite;
}

/* Wiggle Animation */
.animate-wiggle {
  animation: wiggle var(--duration-500) var(--ease-in-out);
}

/* Glow Animation */
.animate-glow {
  animation: glow var(--duration-1000) var(--ease-in-out) infinite;
}

/* ============================================================
   SCROLL REVEAL ANIMATIONS
   ============================================================ */

.reveal {
  opacity: 0;
  transition: opacity var(--duration-700) var(--ease-out),
              transform var(--duration-700) var(--ease-out);
}

.reveal.reveal-active {
  opacity: 1;
}

.reveal-up {
  transform: translateY(30px);
}

.reveal-up.reveal-active {
  transform: translateY(0);
}

.reveal-down {
  transform: translateY(-30px);
}

.reveal-down.reveal-active {
  transform: translateY(0);
}

.reveal-left {
  transform: translateX(-30px);
}

.reveal-left.reveal-active {
  transform: translateX(0);
}

.reveal-right {
  transform: translateX(30px);
}

.reveal-right.reveal-active {
  transform: translateX(0);
}

.reveal-scale {
  transform: scale(0.9);
}

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

/* Stagger Delays */
.reveal-delay-100 {
  transition-delay: 100ms;
}

.reveal-delay-200 {
  transition-delay: 200ms;
}

.reveal-delay-300 {
  transition-delay: 300ms;
}

.reveal-delay-400 {
  transition-delay: 400ms;
}

.reveal-delay-500 {
  transition-delay: 500ms;
}

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

/* Skeleton Loader */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-gray-200) 0%,
    var(--color-gray-100) 50%,
    var(--color-gray-200) 100%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
  border-radius: var(--radius-base);
}

.skeleton-text {
  height: 1em;
  margin-bottom: var(--space-2);
}

.skeleton-heading {
  height: 2em;
  width: 60%;
  margin-bottom: var(--space-4);
}

.skeleton-paragraph {
  height: 1em;
  margin-bottom: var(--space-2);
}

.skeleton-paragraph:last-child {
  width: 80%;
}

.skeleton-avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
}

.skeleton-card {
  height: 200px;
}

/* Spinner */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-gray-300);
  border-top-color: var(--color-primary-600);
  border-radius: var(--radius-full);
  animation: spin var(--duration-700) linear infinite;
}

.spinner-sm {
  width: 16px;
  height: 16px;
  border-width: 2px;
}

.spinner-lg {
  width: 32px;
  height: 32px;
  border-width: 3px;
}

/* Dots Loader */
.dots-loader {
  display: inline-flex;
  gap: var(--space-1);
}

.dots-loader-dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-primary-600);
  border-radius: var(--radius-full);
  animation: pulse var(--duration-700) var(--ease-in-out) infinite;
}

.dots-loader-dot:nth-child(2) {
  animation-delay: 150ms;
}

.dots-loader-dot:nth-child(3) {
  animation-delay: 300ms;
}

/* Progress Bar */
.progress-bar {
  position: relative;
  width: 100%;
  height: 4px;
  background-color: var(--color-gray-200);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background-color: var(--color-primary-600);
  border-radius: var(--radius-full);
  transform-origin: left;
  transition: transform var(--duration-300) var(--ease-out);
}

.progress-bar-indeterminate {
  position: absolute;
  width: 30%;
  height: 100%;
  background-color: var(--color-primary-600);
  border-radius: var(--radius-full);
  animation: indeterminate-progress 1.5s ease-in-out infinite;
}

@keyframes indeterminate-progress {
  0% {
    left: -30%;
  }
  100% {
    left: 100%;
  }
}

/* ============================================================
   MICRO-INTERACTIONS
   ============================================================ */

/* Favorite Button */
.btn-favorite {
  position: relative;
  transition: var(--transition-transform);
}

.btn-favorite:active {
  transform: scale(0.9);
}

.btn-favorite.is-favorite {
  color: var(--color-danger-600);
  animation: heart-beat var(--duration-500) var(--ease-bounce);
}

/* Add to Compare */
.btn-compare {
  transition: var(--transition-colors);
}

.btn-compare:active {
  transform: scale(0.95);
}

.btn-compare.is-comparing {
  background-color: var(--color-success-600);
  color: white;
}

/* Ripple Effect */
.ripple {
  position: relative;
  overflow: hidden;
}

.ripple::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: var(--radius-full);
  background-color: rgba(255, 255, 255, 0.5);
  transform: translate(-50%, -50%);
  transition: width var(--duration-500) var(--ease-out),
              height var(--duration-500) var(--ease-out),
              opacity var(--duration-500) var(--ease-out);
  opacity: 0;
}

.ripple:active::after {
  width: 200%;
  height: 200%;
  opacity: 1;
}

/* Float Effect */
.float {
  animation: float 3s ease-in-out infinite;
}

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

/* Hover Lift */
.hover-lift {
  transition: var(--transition-transform);
}

.hover-lift:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* Hover Grow */
.hover-grow {
  transition: var(--transition-transform);
}

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

/* Hover Glow */
.hover-glow {
  transition: box-shadow var(--duration-300) var(--ease-in-out);
}

.hover-glow:hover {
  box-shadow: 0 0 20px var(--color-primary-500);
}

/* Click Feedback */
.click-feedback:active {
  transform: scale(0.95);
  transition: transform var(--duration-100) var(--ease-in);
}

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

.page-transition-enter {
  opacity: 0;
  transform: translateX(20px);
}

.page-transition-enter-active {
  opacity: 1;
  transform: translateX(0);
  transition: opacity var(--duration-300) var(--ease-out),
              transform var(--duration-300) var(--ease-out);
}

.page-transition-exit {
  opacity: 1;
  transform: translateX(0);
}

.page-transition-exit-active {
  opacity: 0;
  transform: translateX(-20px);
  transition: opacity var(--duration-300) var(--ease-in),
              transform var(--duration-300) var(--ease-in);
}

/* ============================================================
   SCROLL EFFECTS
   ============================================================ */

/* Parallax */
.parallax {
  transition: transform var(--duration-100) linear;
}

/* Sticky Header with Shadow */
.sticky-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  transition: box-shadow var(--duration-300) var(--ease-out);
}

.sticky-header.is-stuck {
  box-shadow: var(--shadow-md);
}

/* Scroll Progress */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--color-primary-500),
    var(--color-secondary-500)
  );
  z-index: var(--z-fixed);
  transition: width var(--duration-100) linear;
}

/* ============================================================
   FORM ANIMATIONS
   ============================================================ */

/* Input Focus Effect */
.form-control-animated {
  position: relative;
}

.form-control-animated::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary-600);
  transition: width var(--duration-300) var(--ease-out);
}

.form-control-animated:focus::after {
  width: 100%;
}

/* Label Float */
.floating-label {
  position: relative;
}

.floating-label input,
.floating-label textarea {
  padding-top: 1.5rem;
}

.floating-label label {
  position: absolute;
  top: 50%;
  left: var(--space-3);
  transform: translateY(-50%);
  font-size: var(--text-base);
  color: var(--color-text-tertiary);
  pointer-events: none;
  transition: all var(--duration-200) var(--ease-out);
}

.floating-label input:focus + label,
.floating-label input:not(:placeholder-shown) + label,
.floating-label textarea:focus + label,
.floating-label textarea:not(:placeholder-shown) + label {
  top: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-primary-600);
}

/* Success/Error Animation */
.form-control.animated-success {
  animation: success-pulse var(--duration-500) var(--ease-out);
}

.form-control.animated-error {
  animation: shake var(--duration-500) var(--ease-in-out);
}

@keyframes success-pulse {
  0%, 100% {
    border-color: var(--color-success-600);
  }
  50% {
    border-color: var(--color-success-600);
    box-shadow: 0 0 0 4px var(--color-success-100);
  }
}

/* ============================================================
   RESPONSIVE BEHAVIOR
   ============================================================ */

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

  .reveal {
    opacity: 1 !important;
    transform: none !important;
  }
}