/* ============================================
   ANIMATIONS - Transitions, Keyframes, Effects
   ============================================ */

/* === PAGE TRANSITIONS === */
.page-enter {
  opacity: 0;
  transform: translateX(20px);
}

.page-enter-active {
  opacity: 1;
  transform: translateX(0);
  transition: opacity var(--transition-normal), transform var(--transition-normal);
}

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

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

/* === FADE ANIMATIONS === */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fadeOut {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.fade-in {
  animation: fadeIn var(--transition-normal) ease forwards;
}

.fade-in-up {
  animation: fadeInUp var(--transition-normal) ease forwards;
}

.fade-in-down {
  animation: fadeInDown var(--transition-normal) ease forwards;
}

/* === SCALE ANIMATIONS === */
@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes scaleOut {
  from {
    opacity: 1;
    transform: scale(1);
  }
  to {
    opacity: 0;
    transform: scale(0.9);
  }
}

.scale-in {
  animation: scaleIn var(--transition-normal) ease forwards;
}

/* === SLIDE ANIMATIONS === */
@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(100%);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInDown {
  from {
    opacity: 0;
    transform: translateY(-100%);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.slide-in-right {
  animation: slideInRight var(--transition-normal) ease forwards;
}

.slide-in-up {
  animation: slideInUp var(--transition-normal) ease forwards;
}

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

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

.loading-spinner--small {
  width: 20px;
  height: 20px;
  border-width: 2px;
}

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

.pulse {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* === SKELETON LOADING === */
@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-bg-secondary) 25%,
    var(--color-bg-tertiary) 50%,
    var(--color-bg-secondary) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

.skeleton-text {
  height: 14px;
  margin-bottom: var(--space-2);
}

.skeleton-title {
  height: 20px;
  width: 60%;
  margin-bottom: var(--space-3);
}

.skeleton-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
}

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

.bounce {
  animation: bounce 0.5s ease;
}

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

.shake {
  animation: shake 0.5s ease;
}

/* === RIPPLE EFFECT === */
.ripple {
  position: relative;
  overflow: hidden;
}

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

.ripple:active::after {
  width: 200px;
  height: 200px;
  opacity: 0;
  transition: width 0.3s ease, height 0.3s ease, opacity 0.3s ease;
}

/* === CHECKBOX ANIMATION === */
@keyframes checkmark {
  0% {
    stroke-dashoffset: 24;
  }
  100% {
    stroke-dashoffset: 0;
  }
}

.checkbox-animated .checkmark {
  stroke-dasharray: 24;
  stroke-dashoffset: 24;
}

.checkbox-animated input:checked + .checkmark {
  animation: checkmark 0.3s ease forwards;
}

/* === COLLAPSE/EXPAND === */
.collapse-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), 
              opacity 0.3s ease;
  opacity: 0;
}

.collapse-content.expanded {
  max-height: 2000px;
  opacity: 1;
}

/* === FLASH HIGHLIGHT === */
@keyframes flashHighlight {
  0% {
    background-color: var(--color-primary-light);
    box-shadow: 0 0 0 3px var(--color-primary-light);
  }
  50% {
    background-color: transparent;
    box-shadow: 0 0 0 0 transparent;
  }
  100% {
    background-color: var(--color-primary-light);
    box-shadow: 0 0 0 3px var(--color-primary-light);
  }
}

.flash-highlight {
  animation: flashHighlight 0.3s ease 2;
}

/* === SMOOTH SELECT/DROPDOWN === */
.select--animated {
  transition: all 0.2s ease;
}

.select--animated:focus {
  transform: scale(1.02);
}

/* === ACCORDION CHEVRON === */
.accordion-chevron {
  transition: transform var(--transition-fast);
}

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

/* === MODAL ANIMATIONS === */
.modal-backdrop {
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.modal-backdrop.visible {
  opacity: 1;
}

.modal-content {
  opacity: 0;
  transform: scale(0.95) translateY(10px);
  transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.modal-content.visible {
  opacity: 1;
  transform: scale(1) translateY(0);
}

/* === TOAST ANIMATIONS === */
@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateY(100%) scale(0.9);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes toastOut {
  from {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  to {
    opacity: 0;
    transform: translateY(100%) scale(0.9);
  }
}

.toast-enter {
  animation: toastIn var(--transition-normal) ease forwards;
}

.toast-exit {
  animation: toastOut var(--transition-normal) ease forwards;
}

/* === STAGGER ANIMATION FOR LISTS === */
.stagger-item {
  opacity: 0;
  transform: translateY(10px);
  animation: fadeInUp var(--transition-normal) ease forwards;
}

.stagger-item:nth-child(1) { animation-delay: 0ms; }
.stagger-item:nth-child(2) { animation-delay: 50ms; }
.stagger-item:nth-child(3) { animation-delay: 100ms; }
.stagger-item:nth-child(4) { animation-delay: 150ms; }
.stagger-item:nth-child(5) { animation-delay: 200ms; }
.stagger-item:nth-child(6) { animation-delay: 250ms; }
.stagger-item:nth-child(7) { animation-delay: 300ms; }
.stagger-item:nth-child(8) { animation-delay: 350ms; }
.stagger-item:nth-child(9) { animation-delay: 400ms; }
.stagger-item:nth-child(10) { animation-delay: 450ms; }

/* === BUTTON PRESS EFFECT === */
.btn-press {
  transition: transform var(--transition-fast);
}

.btn-press:active {
  transform: scale(0.97);
}

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

.hover-lift:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* === REDUCED MOTION === */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .loading-spinner {
    animation: none;
    border-top-color: var(--color-primary);
  }
}