/**
 * MobiDaS Tutorial - Animations & Transitions
 * All animations respect prefers-reduced-motion
 */

/* ═══════════════════════════════════════════════════════════════════════════
   KEYFRAME ANIMATIONS
   ═══════════════════════════════════════════════════════════════════════════ */

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

/* Fade Out */
@keyframes fadeOut {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

/* Slide In from Right */
@keyframes slideInRight {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* Slide Out to Right */
@keyframes slideOutRight {
  from {
    transform: translateX(0);
    opacity: 1;
  }
  to {
    transform: translateX(100%);
    opacity: 0;
  }
}

/* Slide In from Left */
@keyframes slideInLeft {
  from {
    transform: translateX(-100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* Slide Out to Left */
@keyframes slideOutLeft {
  from {
    transform: translateX(0);
    opacity: 1;
  }
  to {
    transform: translateX(-100%);
    opacity: 0;
  }
}

/* Slide In from Top */
@keyframes slideInTop {
  from {
    transform: translateY(-20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* Slide In from Bottom */
@keyframes slideInBottom {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* Scale In */
@keyframes scaleIn {
  from {
    transform: scale(0.95);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

/* Scale Out */
@keyframes scaleOut {
  from {
    transform: scale(1);
    opacity: 1;
  }
  to {
    transform: scale(0.95);
    opacity: 0;
  }
}

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

/* 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);
  }
}

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

/* Progress Fill */
@keyframes progressFill {
  from {
    width: 0;
  }
}

/* Checkmark Draw */
@keyframes checkmarkDraw {
  from {
    stroke-dashoffset: 24;
  }
  to {
    stroke-dashoffset: 0;
  }
}

/* Expand Height */
@keyframes expandHeight {
  from {
    max-height: 0;
    opacity: 0;
  }
  to {
    max-height: 500px;
    opacity: 1;
  }
}

/* Collapse Height */
@keyframes collapseHeight {
  from {
    max-height: 500px;
    opacity: 1;
  }
  to {
    max-height: 0;
    opacity: 0;
  }
}

/* Highlight Flash */
@keyframes highlightFlash {
  0% {
    background-color: transparent;
  }
  50% {
    background-color: var(--color-accent-50);
  }
  100% {
    background-color: transparent;
  }
}

/* ═══════════════════════════════════════════════════════════════════════════
   ANIMATION UTILITY CLASSES
   ═══════════════════════════════════════════════════════════════════════════ */

.animate-fade-in {
  animation: fadeIn var(--transition-base) ease-out;
}

.animate-fade-out {
  animation: fadeOut var(--transition-base) ease-out;
}

.animate-slide-in-right {
  animation: slideInRight var(--transition-base) ease-out;
}

.animate-slide-out-right {
  animation: slideOutRight var(--transition-base) ease-out;
}

.animate-slide-in-left {
  animation: slideInLeft var(--transition-base) ease-out;
}

.animate-slide-in-top {
  animation: slideInTop var(--transition-base) ease-out;
}

.animate-slide-in-bottom {
  animation: slideInBottom var(--transition-base) ease-out;
}

.animate-scale-in {
  animation: scaleIn var(--transition-base) ease-out;
}

.animate-scale-out {
  animation: scaleOut var(--transition-base) ease-out;
}

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

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

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

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

.animate-highlight {
  animation: highlightFlash 1s ease-out;
}

/* ═══════════════════════════════════════════════════════════════════════════
   COMPONENT TRANSITIONS
   ═══════════════════════════════════════════════════════════════════════════ */

/* Toast Notifications */
.toast {
  animation: slideInRight var(--transition-base) ease-out;
}

.toast.hiding {
  animation: slideOutRight var(--transition-base) ease-out;
}

/* Modal */
.modal-backdrop {
  transition: opacity var(--transition-base) ease;
}

.modal-backdrop .modal {
  transition: transform var(--transition-base) ease, opacity var(--transition-base) ease;
}

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

.modal-backdrop.show .modal {
  transform: scale(1);
  opacity: 1;
}

/* Sidebar */
.sidebar {
  transition: transform var(--transition-base) ease;
}

.sidebar.collapsed {
  transform: translateX(-100%);
}

@media (min-width: 769px) {
  .sidebar.collapsed {
    transform: translateX(0);
    width: var(--sidebar-width-collapsed);
  }
}

/* Accordion */
.accordion-content {
  overflow: hidden;
  transition: max-height var(--transition-slow) ease, padding var(--transition-base) ease;
}

.accordion-icon {
  transition: transform var(--transition-base) ease;
}

/* Tabs */
.tab-content {
  animation: fadeIn var(--transition-fast) ease-out;
}

/* Progress Bar */
.progress-fill {
  transition: width var(--transition-slow) ease-out;
}

/* Tooltips */
.glossary-tooltip {
  transition: opacity var(--transition-fast) ease, visibility var(--transition-fast) ease;
}

/* Decision Gate */
.decision-gate {
  transition: border-color var(--transition-base) ease, background var(--transition-base) ease;
}

.decision-gate-icon {
  transition: background-color var(--transition-base) ease;
}

/* Cards */
.card {
  transition: box-shadow var(--transition-base) ease, border-color var(--transition-base) ease;
}

.card-interactive {
  transition: box-shadow var(--transition-base) ease, border-color var(--transition-base) ease, transform var(--transition-base) ease;
}

.card-interactive:hover {
  transform: translateY(-2px);
}

/* Buttons */
.btn {
  transition: background-color var(--transition-fast) ease, color var(--transition-fast) ease, border-color var(--transition-fast) ease, box-shadow var(--transition-fast) ease;
}

/* Form Inputs */
.form-input,
.form-textarea,
.form-select,
.decision-gate-input {
  transition: border-color var(--transition-fast) ease, box-shadow var(--transition-fast) ease;
}

/* Quiz Options */
.quiz-option {
  transition: border-color var(--transition-fast) ease, background-color var(--transition-fast) ease;
}

/* Rubric Rating Buttons */
.rubric-rating-btn {
  transition: border-color var(--transition-fast) ease, background-color var(--transition-fast) ease, color var(--transition-fast) ease;
}

/* Self-Check Items */
.self-check-item {
  transition: background-color var(--transition-fast) ease;
}

/* Module List Links */
.module-list a {
  transition: background-color var(--transition-fast) ease, color var(--transition-fast) ease;
}

/* Freytag Pyramid Stages */
.freytag-stage {
  transition: background-color var(--transition-fast) ease, color var(--transition-fast) ease, border-color var(--transition-fast) ease;
}

/* Reveal Answer Content */
.reveal-answer-content {
  animation: slideInBottom var(--transition-base) ease-out;
}

/* ═══════════════════════════════════════════════════════════════════════════
   LOADING STATES
   ═══════════════════════════════════════════════════════════════════════════ */

.loading-spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.loading-spinner--lg {
  width: 40px;
  height: 40px;
  border-width: 4px;
}

/* Skeleton Loading */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-border) 25%,
    var(--color-border-light) 50%,
    var(--color-border) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton-shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

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

.skeleton-text:last-child {
  width: 60%;
}

.skeleton-heading {
  height: 1.5em;
  width: 40%;
  margin-bottom: 1em;
}

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

.skeleton-card {
  height: 200px;
}

/* ═══════════════════════════════════════════════════════════════════════════
   PAGE TRANSITIONS
   ═══════════════════════════════════════════════════════════════════════════ */

.page-enter {
  animation: fadeIn var(--transition-base) ease-out;
}

.page-exit {
  animation: fadeOut var(--transition-base) ease-out;
}

/* Section reveal on scroll */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow) ease, transform var(--transition-slow) ease;
}

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

/* ═══════════════════════════════════════════════════════════════════════════
   SUCCESS ANIMATIONS
   ═══════════════════════════════════════════════════════════════════════════ */

/* Completion checkmark */
.completion-checkmark {
  width: 60px;
  height: 60px;
}

.completion-checkmark circle {
  stroke: var(--color-success);
  stroke-dasharray: 166;
  stroke-dashoffset: 166;
  animation: checkmarkCircle 0.6s ease-in-out forwards;
}

.completion-checkmark path {
  stroke: var(--color-success);
  stroke-dasharray: 48;
  stroke-dashoffset: 48;
  animation: checkmarkDraw 0.3s ease-in-out 0.6s forwards;
}

@keyframes checkmarkCircle {
  to {
    stroke-dashoffset: 0;
  }
}

/* Module completion celebration */
.celebration-confetti {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: var(--z-toast);
}

/* ═══════════════════════════════════════════════════════════════════════════
   STAGGER ANIMATIONS
   ═══════════════════════════════════════════════════════════════════════════ */

/* Staggered list items */
.stagger-children > * {
  opacity: 0;
  animation: fadeIn var(--transition-base) ease-out forwards;
}

.stagger-children > *:nth-child(1) { animation-delay: 0ms; }
.stagger-children > *:nth-child(2) { animation-delay: 50ms; }
.stagger-children > *:nth-child(3) { animation-delay: 100ms; }
.stagger-children > *:nth-child(4) { animation-delay: 150ms; }
.stagger-children > *:nth-child(5) { animation-delay: 200ms; }
.stagger-children > *:nth-child(6) { animation-delay: 250ms; }
.stagger-children > *:nth-child(7) { animation-delay: 300ms; }
.stagger-children > *:nth-child(8) { animation-delay: 350ms; }

/* ═══════════════════════════════════════════════════════════════════════════
   INTERACTION FEEDBACK
   ═══════════════════════════════════════════════════════════════════════════ */

/* Button press effect */
.btn:active:not(:disabled) {
  transform: scale(0.98);
}

/* Checkbox check animation */
.checkbox-animated:checked {
  animation: checkmarkDraw 0.2s ease-out;
}

/* Radio select animation */
.radio-animated:checked::after {
  animation: scaleIn 0.15s ease-out;
}

/* Input focus glow */
.input-glow:focus {
  animation: inputGlow 0.3s ease-out;
}

@keyframes inputGlow {
  0% {
    box-shadow: 0 0 0 0 var(--color-primary-100);
  }
  100% {
    box-shadow: 0 0 0 4px var(--color-primary-100);
  }
}

/* ═══════════════════════════════════════════════════════════════════════════
   REDUCED MOTION OVERRIDE
   All animations disabled for users who prefer reduced motion
   ═══════════════════════════════════════════════════════════════════════════ */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    animation-delay: 0ms !important;
  }

  /* Remove all utility animations */
  .animate-fade-in,
  .animate-fade-out,
  .animate-slide-in-right,
  .animate-slide-out-right,
  .animate-slide-in-left,
  .animate-slide-in-top,
  .animate-slide-in-bottom,
  .animate-scale-in,
  .animate-scale-out,
  .animate-pulse,
  .animate-bounce,
  .animate-shake,
  .animate-spin,
  .animate-highlight {
    animation: none !important;
  }

  /* Instant state changes */
  .toast,
  .modal-backdrop,
  .modal,
  .sidebar,
  .accordion-content,
  .tab-content,
  .progress-fill,
  .glossary-tooltip,
  .card,
  .card-interactive,
  .btn,
  .form-input,
  .form-textarea,
  .form-select,
  .quiz-option,
  .rubric-rating-btn,
  .self-check-item,
  .module-list a,
  .freytag-stage,
  .decision-gate,
  .decision-gate-icon {
    transition: none !important;
  }

  /* No transform on button press */
  .btn:active:not(:disabled) {
    transform: none !important;
  }

  /* No transform on card hover */
  .card-interactive:hover {
    transform: none !important;
  }

  /* Instant reveal */
  .reveal-on-scroll {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  /* Skeleton loading - show static state */
  .skeleton {
    animation: none !important;
    background: var(--color-border) !important;
  }

  /* Loading spinner - show static indicator */
  .loading-spinner {
    animation: none !important;
    border-top-color: var(--color-primary);
    border-right-color: var(--color-primary);
  }

  /* Stagger - all visible immediately */
  .stagger-children > * {
    opacity: 1 !important;
    animation: none !important;
  }
}