/**
 * CSS Animations - Air Tasman Login Page
 * Keyframes and animation utilities for enhanced UX
 */

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

/* Fade in animation for page load */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Slide up animation */
@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Shake animation for error states */
@keyframes shake {
  0%, 100% {
    transform: translateX(0);
  }
  10%, 30%, 50%, 70%, 90% {
    transform: translateX(-4px);
  }
  20%, 40%, 60%, 80% {
    transform: translateX(4px);
  }
}

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

/* Spinner rotation for loading indicators */
@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

/* Scale animation for button interactions */
@keyframes scaleIn {
  from {
    transform: scale(0.95);
  }
  to {
    transform: scale(1);
  }
}

/* Bounce animation for error highlighting */
@keyframes bounce {
  0%, 20%, 53%, 80%, 100% {
    transform: translateY(0);
  }
  40%, 43% {
    transform: translateY(-8px);
  }
  70% {
    transform: translateY(-4px);
  }
  90% {
    transform: translateY(-2px);
  }
}

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

/* Page load animations */
.animate-fade-in {
  animation: fadeIn var(--transition-medium) var(--ease-out) forwards;
}

.animate-slide-up {
  animation: slideUp var(--transition-medium) var(--ease-out) forwards;
}

/* Error state animations */
.animate-shake {
  animation: shake 0.5s var(--ease-out);
}

.animate-bounce {
  animation: bounce 0.6s var(--ease-bounce);
}

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

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

/* Interactive animations */
.animate-scale-in {
  animation: scaleIn var(--transition-fast) var(--ease-out);
}

/* =====================
   TRANSITION UTILITIES
   ===================== */

/* Base transition classes */
.transition-all {
  transition: all var(--transition-fast) var(--ease-out);
}

.transition-colors {
  transition: color var(--transition-fast) var(--ease-out),
              background-color var(--transition-fast) var(--ease-out),
              border-color var(--transition-fast) var(--ease-out);
}

.transition-transform {
  transition: transform var(--transition-fast) var(--ease-out);
}

.transition-opacity {
  transition: opacity var(--transition-fast) var(--ease-out);
}

.transition-shadow {
  transition: box-shadow var(--transition-fast) var(--ease-out);
}

/* Duration modifiers */
.duration-fast {
  transition-duration: var(--transition-fast);
}

.duration-medium {
  transition-duration: var(--transition-medium);
}

.duration-slow {
  transition-duration: var(--transition-slow);
}

/* =====================
   LOADING SPINNER
   ===================== */

.loading-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: currentColor;
  animation: spin 1s linear infinite;
}

/* =====================
   ACCESSIBILITY CONSIDERATIONS
   ===================== */

/* Respect user's motion preferences */
@media (prefers-reduced-motion: reduce) {
  /* Disable all animations except opacity changes */
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  /* Keep opacity transitions for accessibility */
  .transition-opacity,
  .animate-fade-in {
    animation-duration: var(--transition-fast) !important;
    transition-duration: var(--transition-fast) !important;
  }
  
  /* Remove transform-based animations */
  .animate-shake,
  .animate-bounce,
  .animate-slide-up,
  .animate-scale-in {
    animation: none !important;
    transform: none !important;
  }
  
  /* Simplify loading indicators */
  .loading-spinner {
    animation: pulse 2s infinite !important;
  }
}

/* =====================
   HOVER & FOCUS STATES
   ===================== */

/* Smooth hover transitions */
.hover-lift:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.hover-scale:hover {
  transform: scale(1.02);
}

/* Focus animations */
.focus-ring:focus {
  outline: none;
  box-shadow: var(--focus-ring);
  animation: scaleIn var(--transition-fast) var(--ease-out);
}

/* =====================
   STAGGERED ANIMATIONS
   ===================== */

/* For animating lists or multiple elements */
.stagger-children > * {
  animation-delay: calc(var(--stagger-delay, 100ms) * var(--stagger-index, 0));
}

/* =====================
   PERFORMANCE OPTIMIZATIONS
   ===================== */

/* Hardware acceleration for smooth animations */
.gpu-accelerated {
  transform: translateZ(0);
  backface-visibility: hidden;
  perspective: 1000px;
}

/* Prevent layout thrashing */
.animate-transform-only {
  will-change: transform;
}

.animate-opacity-only {
  will-change: opacity;
}