/* Animations - Respects prefers-reduced-motion */

/* ============================================
   FADE IN ANIMATIONS
   ============================================ */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

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

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

/* ============================================
   SLIDE ANIMATIONS
   ============================================ */
@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

/* ============================================
   PULSE & BOUNCE
   ============================================ */
@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

@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);
  }
}

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

/* ============================================
   SKELETON LOADING
   ============================================ */
@keyframes skeleton {
  0% {
    background-position: -200px 0;
  }
  100% {
    background-position: calc(200px + 100%) 0;
  }
}

/* ============================================
   ANIMATION UTILITY CLASSES
   ============================================ */
.animate-fade-in {
  animation: fadeIn 0.6s ease-out forwards;
}

.animate-fade-in-up {
  animation: fadeInUp 0.6s ease-out forwards;
}

.animate-fade-in-down {
  animation: fadeInDown 0.6s ease-out forwards;
}

.animate-fade-in-scale {
  animation: fadeInScale 0.4s ease-out forwards;
}

.animate-slide-in-right {
  animation: slideInRight 0.5s ease-out forwards;
}

.animate-slide-in-left {
  animation: slideInLeft 0.5s ease-out forwards;
}

/* ============================================
   STAGGERED ANIMATIONS
   ============================================ */
.animate-stagger > * {
  opacity: 0;
  animation: fadeInUp 0.6s ease-out forwards;
}

.animate-stagger > *:nth-child(1) {
  animation-delay: 0.1s;
}

.animate-stagger > *:nth-child(2) {
  animation-delay: 0.2s;
}

.animate-stagger > *:nth-child(3) {
  animation-delay: 0.3s;
}

.animate-stagger > *:nth-child(4) {
  animation-delay: 0.4s;
}

.animate-stagger > *:nth-child(5) {
  animation-delay: 0.5s;
}

.animate-stagger > *:nth-child(6) {
  animation-delay: 0.6s;
}

.animate-stagger > *:nth-child(n+7) {
  animation-delay: 0.7s;
}

/* ============================================
   HOVER ANIMATIONS
   ============================================ */
.hover-lift {
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.hover-scale {
  transition: transform var(--transition-base);
}

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

.hover-glow {
  transition: box-shadow var(--transition-base);
}

.hover-glow:hover {
  box-shadow: 0 0 20px rgba(251, 191, 36, 0.4);
}

/* ============================================
   LOADING STATES
   ============================================ */
.loading-skeleton {
  background: linear-gradient(
    90deg,
    var(--color-surface) 0px,
    var(--color-border-light) 40px,
    var(--color-surface) 80px
  );
  background-size: 200px 100%;
  animation: skeleton 1.5s infinite linear;
  border-radius: var(--radius-md);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: var(--radius-full);
  animation: spin 0.8s linear infinite;
}

/* ============================================
   BUTTON ANIMATIONS
   ============================================ */
.button-ripple {
  position: relative;
  overflow: hidden;
}

.button-ripple::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.button-ripple:active::after {
  width: 300px;
  height: 300px;
}

/* ============================================
   PAGE TRANSITIONS
   ============================================ */
.page-enter {
  animation: fadeIn 0.4s ease-out forwards;
}

/* ============================================
   COMPONENT-SPECIFIC ANIMATIONS
   ============================================ */

/* Hero Section */
.hero__title {
  animation: fadeInDown 0.8s ease-out forwards;
}

.hero__subtitle {
  opacity: 0;
  animation: fadeInUp 0.8s ease-out 0.2s forwards;
}

.hero__actions {
  opacity: 0;
  animation: fadeInUp 0.8s ease-out 0.4s forwards;
}

/* Category Cards */
.category-card {
  opacity: 0;
  animation: fadeInScale 0.5s ease-out forwards;
}

.category-card:nth-child(1) {
  animation-delay: 0.1s;
}

.category-card:nth-child(2) {
  animation-delay: 0.2s;
}

.category-card:nth-child(3) {
  animation-delay: 0.3s;
}

.category-card:nth-child(4) {
  animation-delay: 0.4s;
}

/* Video Cards */
.video-card {
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.video-card:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: var(--shadow-lg);
}

/* Navigation */
.header__nav-link {
  position: relative;
  transition: color var(--transition-fast);
}

.header__nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 50%;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transform: translateX(-50%);
  transition: width var(--transition-base);
}

.header__nav-link:hover::after,
.header__nav-link--active::after {
  width: calc(100% - 16px);
}

/* Buttons */
.hero__button,
.challenge-banner__button,
.auth-form__submit--primary,
.video-page__action-button--primary,
.profile-page__action-button--primary {
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.hero__button:hover,
.challenge-banner__button:hover,
.auth-form__submit--primary:hover,
.video-page__action-button--primary:hover,
.profile-page__action-button--primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.hero__button:active,
.challenge-banner__button:active,
.auth-form__submit--primary:active,
.video-page__action-button--primary:active,
.profile-page__action-button--primary:active {
  transform: translateY(0);
}

/* Form Inputs */
.auth-form__input:focus,
.email-capture__input:focus,
.video-comments__input:focus {
  transform: scale(1.02);
  box-shadow: 0 0 0 3px rgba(45, 80, 22, 0.1);
}

/* Tabs */
.discover__tab,
.video-ideas__tab,
.profile-page__tab,
.auth-page__tab {
  position: relative;
  transition: color var(--transition-fast);
}

.discover__tab::after,
.video-ideas__tab::after,
.profile-page__tab::after,
.auth-page__tab::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-base);
}

.discover__tab--active::after,
.video-ideas__tab--active::after,
.profile-page__tab--active::after,
.auth-page__tab--active::after {
  width: 100%;
}

/* Continuation Carousel */
.video-continuation-card {
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.video-continuation-card:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: var(--shadow-md);
}

/* Comments */
.video-comment {
  animation: fadeIn 0.4s ease-out forwards;
}

.video-comment:nth-child(even) {
  animation-delay: 0.1s;
}

/* Profile Avatar */
.profile-page__avatar {
  animation: fadeInScale 0.6s ease-out 0.3s forwards;
  opacity: 0;
}

/* Recipe Cards */
.recipe-card {
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.recipe-card:hover {
  transform: translateY(-4px) rotate(1deg);
  box-shadow: var(--shadow-lg);
}

/* Course Cards */
.course-card {
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

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

/* Creator Cards */
.creator-card {
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.creator-card:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: var(--shadow-xl);
}

.creator-card__avatar {
  transition: transform var(--transition-base);
}

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

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

.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-surface) 0px,
    var(--color-border-light) 50px,
    var(--color-surface) 100px
  );
  background-size: 1000px 100%;
  animation: shimmer 2s infinite;
}

/* Scroll Animations (will be enhanced with JS in Stage 3) */
.scroll-reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.scroll-reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   PARALLAX EFFECTS
   ============================================ */
.parallax-container {
  position: relative;
  overflow: hidden;
  will-change: transform;
}

.parallax-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  will-change: transform;
}

.parallax-slow {
  transform: translateZ(0);
  transition: transform 0.1s ease-out;
}

.parallax-medium {
  transform: translateZ(0);
  transition: transform 0.15s ease-out;
}

.parallax-fast {
  transform: translateZ(0);
  transition: transform 0.2s ease-out;
}

/* Hero Parallax */
.hero {
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 1px, transparent 1px);
  background-size: 50px 50px;
  animation: parallax-bg 20s linear infinite;
  will-change: transform;
  pointer-events: none;
}

@keyframes parallax-bg {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(50px, 50px);
  }
}

.hero__container {
  position: relative;
  z-index: 1;
}

/* Challenge Banner Parallax */
.challenge-banner {
  position: relative;
  overflow: hidden;
}

.challenge-banner::before {
  content: '';
  position: absolute;
  top: -100%;
  left: -100%;
  width: 300%;
  height: 300%;
  background: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 10px,
    rgba(255, 255, 255, 0.03) 10px,
    rgba(255, 255, 255, 0.03) 20px
  );
  animation: parallax-diagonal 15s linear infinite;
  will-change: transform;
  pointer-events: none;
}

@keyframes parallax-diagonal {
  0% {
    transform: translate(0, 0) rotate(0deg);
  }
  100% {
    transform: translate(100px, 100px) rotate(360deg);
  }
}

.challenge-banner__container {
  position: relative;
  z-index: 1;
}

/* Profile Banner Parallax */
.profile-page__banner {
  position: relative;
  overflow: hidden;
}

.profile-page__banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
  will-change: transform;
  pointer-events: none;
}

/* Floating Elements */
.floating {
  animation: floating 3s ease-in-out infinite;
}

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

.floating-slow {
  animation: floating-slow 4s ease-in-out infinite;
}

@keyframes floating-slow {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-15px);
  }
}

/* Scroll-based Parallax (will be enhanced with JS in Stage 3) */
.parallax-scroll {
  transform: translateZ(0);
  will-change: transform;
}

/* Category Icons Parallax */
.category-card__icon {
  display: inline-block;
  transition: transform 0.3s ease-out;
}

.category-card:hover .category-card__icon {
  transform: translateY(-5px) scale(1.1);
  animation: bounce 0.6s ease-in-out;
}

/* Video Thumbnail Parallax Effect */
.video-card__thumbnail {
  position: relative;
  overflow: hidden;
}

.video-card__thumbnail::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    45deg,
    transparent 30%,
    rgba(255, 255, 255, 0.1) 50%,
    transparent 70%
  );
  transform: translateX(-100%) translateY(-100%) rotate(45deg);
  transition: transform 0.6s;
  pointer-events: none;
}

.video-card:hover .video-card__thumbnail::after {
  transform: translateX(100%) translateY(100%) rotate(45deg);
}

/* Recipe Card Parallax */
.recipe-card__thumbnail {
  position: relative;
  overflow: hidden;
}

.recipe-card__thumbnail::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  transition: left 0.5s;
  pointer-events: none;
}

.recipe-card:hover .recipe-card__thumbnail::before {
  left: 100%;
}

/* Creator Avatar Parallax */
.creator-card__avatar {
  position: relative;
  transition: transform 0.3s ease-out;
}

.creator-card:hover .creator-card__avatar {
  transform: translateY(-5px) rotate(5deg) scale(1.1);
}

/* Profile Avatar Parallax */
.profile-page__avatar {
  position: relative;
}

.profile-page__avatar::after {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  border-radius: var(--radius-full);
  background: linear-gradient(45deg, var(--color-primary), var(--color-yellow), var(--color-accent), var(--color-primary));
  background-size: 200% 200%;
  animation: gradient-rotate 3s ease infinite;
  z-index: -1;
  opacity: 0;
  transition: opacity 0.3s;
}

.profile-page__avatar:hover::after {
  opacity: 1;
}

@keyframes gradient-rotate {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

/* Background Parallax Layers */
.parallax-bg-layer-1 {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 120%;
  background: radial-gradient(circle at 30% 20%, rgba(45, 80, 22, 0.1) 0%, transparent 50%);
  will-change: transform;
  pointer-events: none;
  z-index: 0;
}

.parallax-bg-layer-2 {
  position: absolute;
  top: 0;
  right: 0;
  width: 100%;
  height: 120%;
  background: radial-gradient(circle at 70% 80%, rgba(107, 142, 35, 0.1) 0%, transparent 50%);
  will-change: transform;
  pointer-events: none;
  z-index: 0;
}

/* Section Parallax */
.section-parallax {
  position: relative;
  overflow: hidden;
}

.section-parallax::before {
  content: '';
  position: absolute;
  top: -20%;
  left: -20%;
  width: 140%;
  height: 140%;
  background: 
    radial-gradient(circle at 25% 25%, rgba(45, 80, 22, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 75% 75%, rgba(107, 142, 35, 0.05) 0%, transparent 50%);
  will-change: transform;
  pointer-events: none;
  z-index: 0;
}

.section-parallax > * {
  position: relative;
  z-index: 1;
}

/* ============================================
   RESPECT 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;
  }
  
  .animate-fade-in,
  .animate-fade-in-up,
  .animate-fade-in-down,
  .animate-fade-in-scale,
  .animate-slide-in-right,
  .animate-slide-in-left,
  .animate-stagger > * {
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
  
  .hero__title,
  .hero__subtitle,
  .hero__actions,
  .category-card,
  .profile-page__avatar {
    animation: none !important;
    opacity: 1 !important;
  }
  
  /* Disable parallax for reduced motion */
  .hero::before,
  .challenge-banner::before,
  .profile-page__banner::before,
  .parallax-bg-layer-1,
  .parallax-bg-layer-2,
  .section-parallax::before {
    animation: none !important;
    transform: none !important;
  }
  
  .floating,
  .floating-slow {
    animation: none !important;
    transform: none !important;
  }
  
  .category-card:hover .category-card__icon,
  .creator-card:hover .creator-card__avatar,
  .profile-page__avatar::after {
    transform: none !important;
    animation: none !important;
  }
}