/* Animation System - Subtle UX enhancements with performance optimization */

/* Animation Performance Settings */
* {
  /* Optimize animation performance */
  backface-visibility: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

:root {
  /* Animation Timing - Based on UX research */
  --anim-duration-instant: 100ms;   /* Button feedback, simple interactions */
  --anim-duration-fast: 150ms;      /* Panel slide, quick transitions */
  --anim-duration-normal: 200ms;    /* Modal open/close, content transitions */
  --anim-duration-slow: 300ms;      /* Complex transitions, stepper changes */
  
  /* Easing Functions - Natural motion curves */
  --anim-ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);        /* Quick start, smooth end */
  --anim-ease-in: cubic-bezier(0.55, 0.055, 0.675, 0.19);       /* Smooth start, quick end */
  --anim-ease-in-out: cubic-bezier(0.645, 0.045, 0.355, 1);     /* Balanced, natural */
  --anim-ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);   /* Subtle bounce */
  
  /* GPU Acceleration Hints */
  --anim-will-change: transform, opacity;
}

/* Reduced Motion Support - Accessibility First */
@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;
  }
}

/* === PANEL SLIDE ANIMATIONS === */

/* Layer Manager Panel */
.layer-manager {
  transition: transform var(--anim-duration-fast) var(--anim-ease-out),
              opacity var(--anim-duration-fast) var(--anim-ease-out);
  will-change: var(--anim-will-change);
}

.layer-manager.ui-animate-slide-in {
  animation: slideInFromLeft var(--anim-duration-fast) var(--anim-ease-out) forwards;
}

.layer-manager.ui-animate-slide-out {
  animation: slideOutToLeft var(--anim-duration-fast) var(--anim-ease-in) forwards;
}

/* Inspector Panel */
.inspector {
  transition: transform var(--anim-duration-fast) var(--anim-ease-out),
              opacity var(--anim-duration-fast) var(--anim-ease-out);
  will-change: var(--anim-will-change);
}

.inspector.ui-animate-slide-in {
  animation: slideInFromRight var(--anim-duration-fast) var(--anim-ease-out) forwards;
}

.inspector.ui-animate-slide-out {
  animation: slideOutToRight var(--anim-duration-fast) var(--anim-ease-in) forwards;
}

/* Panel Collapse/Expand Animations */
.panel-collapsing {
  transition: width var(--anim-duration-normal) var(--anim-ease-out);
  will-change: width;
}

.panel-expanding {
  transition: width var(--anim-duration-normal) var(--anim-ease-out);
  will-change: width;
}

/* === BUTTON ANIMATIONS === */

/* Base Button Animation Setup */
.btn {
  transition: background-color var(--anim-duration-instant) var(--anim-ease-out),
              border-color var(--anim-duration-instant) var(--anim-ease-out),
              color var(--anim-duration-instant) var(--anim-ease-out),
              transform var(--anim-duration-instant) var(--anim-ease-out),
              box-shadow var(--anim-duration-instant) var(--anim-ease-out);
  will-change: var(--anim-will-change);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active,
.btn.ui-animate-press {
  transform: translateY(0) scale(0.98);
  transition-duration: calc(var(--anim-duration-instant) / 2);
}

/* Button Press Animation */
.btn.ui-animate-pressed {
  animation: buttonPress var(--anim-duration-instant) var(--anim-ease-out);
}

/* Loading State Animation */
.btn.ui-animate-loading {
  position: relative;
  color: transparent !important;
}

.btn.ui-animate-loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 16px;
  height: 16px;
  margin: -8px 0 0 -8px;
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: var(--radius-full);
  animation: buttonSpinner 0.8s linear infinite;
}

/* === TOAST ANIMATIONS === */

.toast-container {
  position: fixed;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  z-index: var(--z-toast);
  pointer-events: none;
}

.toast {
  transition: all var(--anim-duration-normal) var(--anim-ease-out);
  will-change: var(--anim-will-change);
  pointer-events: auto;
  margin-bottom: var(--spacing-sm);
}

.toast.ui-animate-fade-in {
  animation: toastFadeIn var(--anim-duration-normal) var(--anim-ease-out) forwards;
}

.toast.ui-animate-fade-out {
  animation: toastFadeOut var(--anim-duration-normal) var(--anim-ease-in) forwards;
}

.toast.ui-animate-slide-out {
  animation: toastSlideOut var(--anim-duration-fast) var(--anim-ease-in) forwards;
}

/* === STEPPER ANIMATIONS === */

.progress-steps {
  will-change: var(--anim-will-change);
}

.progress-step {
  transition: all var(--anim-duration-normal) var(--anim-ease-out);
  will-change: var(--anim-will-change);
}

.progress-step.ui-animate-activate {
  animation: stepperActivate var(--anim-duration-slow) var(--anim-ease-bounce) forwards;
}

.progress-step.ui-animate-complete {
  animation: stepperComplete var(--anim-duration-normal) var(--anim-ease-out) forwards;
}

/* Progress Bar Animation */
.progress-step-connector {
  transition: background-color var(--anim-duration-slow) var(--anim-ease-out);
  will-change: background-color;
}

.progress-step-connector.ui-animate-fill {
  animation: progressFill var(--anim-duration-slow) var(--anim-ease-out) forwards;
}

/* === MODAL ANIMATIONS === */

.modal-overlay {
  transition: opacity var(--anim-duration-normal) var(--anim-ease-out);
  will-change: opacity;
}

.modal-overlay.ui-animate-fade-in {
  animation: modalFadeIn var(--anim-duration-normal) var(--anim-ease-out) forwards;
}

.modal-overlay.ui-animate-fade-out {
  animation: modalFadeOut var(--anim-duration-normal) var(--anim-ease-in) forwards;
}

.modal-content {
  transition: transform var(--anim-duration-normal) var(--anim-ease-out),
              opacity var(--anim-duration-normal) var(--anim-ease-out);
  will-change: var(--anim-will-change);
}

.modal-content.ui-animate-scale-in {
  animation: modalScaleIn var(--anim-duration-normal) var(--anim-ease-out) forwards;
}

.modal-content.ui-animate-scale-out {
  animation: modalScaleOut var(--anim-duration-normal) var(--anim-ease-in) forwards;
}

/* === KEYFRAME DEFINITIONS === */

/* Panel Slide Animations */
@keyframes slideInFromLeft {
  from {
    transform: translateX(-100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

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

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

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

/* Button Animations */
@keyframes buttonPress {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(0.98);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes buttonSpinner {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* Toast Animations */
@keyframes toastFadeIn {
  0% {
    opacity: 0;
    transform: translateX(100%) scale(0.8);
  }
  100% {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
}

@keyframes toastFadeOut {
  0% {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
  100% {
    opacity: 0;
    transform: translateX(100%) scale(0.8);
  }
}

@keyframes toastSlideOut {
  0% {
    transform: translateX(0);
    opacity: 1;
  }
  100% {
    transform: translateX(100%);
    opacity: 0;
  }
}

/* Stepper Animations */
@keyframes stepperActivate {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
  100% {
    transform: scale(1);
  }
}

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

@keyframes progressFill {
  0% {
    width: 0%;
  }
  100% {
    width: 100%;
  }
}

/* Modal Animations */
@keyframes modalFadeIn {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

@keyframes modalFadeOut {
  0% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}

@keyframes modalScaleIn {
  0% {
    opacity: 0;
    transform: scale(0.9);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes modalScaleOut {
  0% {
    opacity: 1;
    transform: scale(1);
  }
  100% {
    opacity: 0;
    transform: scale(0.9);
  }
}

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

/* Animation Control */
.ui-no-animation {
  animation: none !important;
  transition: none !important;
}

.ui-animation-paused {
  animation-play-state: paused !important;
}

.ui-animation-running {
  animation-play-state: running !important;
}

/* Performance Optimization */
.ui-animate-gpu {
  transform: translateZ(0);
  will-change: var(--anim-will-change);
}

.ui-animate-reset {
  will-change: auto;
  transform: none;
}

/* Focus and Hover States */
.ui-animate-focus {
  transition: box-shadow var(--anim-duration-instant) var(--anim-ease-out);
}

.ui-animate-focus:focus-visible {
  box-shadow: 0 0 0 2px var(--accent-primary);
}

/* Mobile Optimizations */
@media (max-width: 768px) {
  /* Reduce animation complexity on mobile for better performance */
  .ui-animate-slide-in,
  .ui-animate-slide-out {
    animation-duration: calc(var(--anim-duration-fast) * 0.8);
  }
  
  .modal-content.ui-animate-scale-in,
  .modal-content.ui-animate-scale-out {
    animation-duration: calc(var(--anim-duration-normal) * 0.8);
  }
}

/* High contrast mode - disable decorative animations */
@media (prefers-contrast: high) {
  .btn:hover {
    transform: none;
  }
  
  .ui-animate-scale-in,
  .ui-animate-scale-out {
    animation: none !important;
  }
}