/* ============================================================
   AIRPAK EXPRESS NOVA — iOS 26 Animation System
   Apple Spring Physics + Micro-interactions
   ============================================================ */

/* ===== SPRING ANIMATIONS ===== */
@keyframes apple-spring-in {
  0% {
    opacity: 0;
    transform: scale(0.90) translateY(8px);
  }
  60% {
    transform: scale(1.02) translateY(-2px);
  }
  80% {
    transform: scale(0.98) translateY(1px);
  }
  100% {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

@keyframes apple-spring-out {
  0% {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
  20% {
    transform: scale(1.02) translateY(-2px);
  }
  100% {
    opacity: 0;
    transform: scale(0.95) translateY(8px);
  }
}

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

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

@keyframes slide-in-right {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slide-in-left {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fade-out {
  from { opacity: 1; }
  to { opacity: 0; }
}

@keyframes scale-in {
  from {
    opacity: 0;
    transform: scale(0.85);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes scale-out {
  from {
    opacity: 1;
    transform: scale(1);
  }
  to {
    opacity: 0;
    transform: scale(0.85);
  }
}

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

/* Pulse for live indicators */
@keyframes pulse-dot {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.6;
    transform: scale(1.15);
  }
}

@keyframes pulse-ring {
  0% {
    transform: scale(1);
    opacity: 0.8;
  }
  100% {
    transform: scale(1.8);
    opacity: 0;
  }
}

/* Shimmer for skeleton loaders */
@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

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

/* Bounce for success */
@keyframes bounce-in {
  0% { transform: scale(0); }
  50% { transform: scale(1.15); }
  70% { transform: scale(0.95); }
  85% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

/* Float for ambient motion */
@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  25% { transform: translateY(-12px) rotate(1deg); }
  50% { transform: translateY(-6px) rotate(-0.5deg); }
  75% { transform: translateY(-18px) rotate(2deg); }
}

/* ===== ANIMATION UTILITY CLASSES ===== */
.animate-spring-in {
  animation: apple-spring-in 0.5s var(--ease-spring) forwards;
}

.animate-spring-out {
  animation: apple-spring-out 0.3s var(--ease-spring) forwards;
}

.animate-slide-up {
  animation: slide-up 0.4s var(--ease-spring) forwards;
}

.animate-slide-down {
  animation: slide-down 0.4s var(--ease-spring) forwards;
}

.animate-slide-right {
  animation: slide-in-right 0.4s var(--ease-spring) forwards;
}

.animate-slide-left {
  animation: slide-in-left 0.4s var(--ease-spring) forwards;
}

.animate-fade-in {
  animation: fade-in 0.3s var(--ease-out) forwards;
}

.animate-fade-out {
  animation: fade-out 0.2s var(--ease-in) forwards;
}

.animate-scale-in {
  animation: scale-in 0.3s var(--ease-spring) forwards;
}

.animate-scale-out {
  animation: scale-out 0.2s var(--ease-spring) forwards;
}

.animate-shake {
  animation: shake 0.5s var(--ease-smooth);
}

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

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

.animate-bounce {
  animation: bounce-in 0.5s var(--ease-spring-bounce);
}

.animate-float {
  animation: float 6s ease-in-out infinite;
}

/* Stagger children */
.stagger-children > * {
  opacity: 0;
  animation: slide-up 0.4s var(--ease-spring) 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; }
.stagger-children > *:nth-child(9) { animation-delay: 400ms; }
.stagger-children > *:nth-child(10) { animation-delay: 450ms; }
.stagger-children > *:nth-child(11) { animation-delay: 500ms; }
.stagger-children > *:nth-child(12) { animation-delay: 550ms; }

/* ===== SKELETON LOADER ===== */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--apple-fill-tertiary) 25%,
    var(--apple-fill-secondary) 50%,
    var(--apple-fill-tertiary) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

.skeleton-text {
  height: 14px;
  border-radius: var(--radius-xs);
}

.skeleton-title {
  height: 24px;
  width: 60%;
  border-radius: var(--radius-sm);
}

.skeleton-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
}

.skeleton-card {
  height: 160px;
  border-radius: var(--radius-xl);
}

/* ===== TRANSITION UTILITIES ===== */
.transition-all {
  transition: all var(--duration-normal) var(--ease-smooth);
}

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

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

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

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

/* ===== HOVER EFFECTS ===== */
.hover-lift {
  transition: transform var(--duration-fast) var(--ease-spring),
              box-shadow var(--duration-fast) var(--ease-smooth);
}

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

.hover-scale {
  transition: transform var(--duration-fast) var(--ease-spring);
}

.hover-scale:hover {
  transform: scale(1.03);
}

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

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

/* ===== TOAST / NOTIFICATION ===== */
.toast {
  position: fixed;
  top: calc(var(--nav-height) + var(--space-4));
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-toast);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  background: var(--apple-bg-secondary);
  backdrop-filter: var(--glass-blur-heavy);
  -webkit-backdrop-filter: var(--glass-blur-heavy);
  border: 1px solid var(--glass-border-strong);
  border-radius: var(--radius-xl);
  box-shadow: var(--glass-shadow-strong);
  animation: slide-down 0.4s var(--ease-spring) forwards;
}

.toast.success {
  border-left: 4px solid var(--apple-green);
}

.toast.error {
  border-left: 4px solid var(--apple-red);
}

.toast.warning {
  border-left: 4px solid var(--apple-orange);
}

.toast.info {
  border-left: 4px solid var(--apple-blue);
}

/* ===== BOTTOM SHEET ===== */
.bottom-sheet-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: var(--z-modal-backdrop);
  animation: fade-in 0.2s var(--ease-out) forwards;
}

.bottom-sheet {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: var(--z-modal);
  background: var(--apple-bg-grouped-secondary);
  backdrop-filter: var(--glass-blur-heavy);
  -webkit-backdrop-filter: var(--glass-blur-heavy);
  border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
  box-shadow: 0 -8px 40px rgba(0, 0, 0, 0.2);
  animation: slide-up 0.4s var(--ease-spring) forwards;
}

.bottom-sheet-handle {
  width: 36px;
  height: 5px;
  background: var(--apple-fill-tertiary);
  border-radius: var(--radius-full);
  margin: var(--space-3) auto var(--space-4);
}

/* ===== MODAL ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: var(--z-modal-backdrop);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  animation: fade-in 0.2s var(--ease-out) forwards;
}

.modal {
  background: var(--apple-bg-secondary);
  border-radius: var(--radius-2xl);
  box-shadow: var(--glass-shadow-ultra);
  max-width: 480px;
  width: 100%;
  animation: scale-in 0.3s var(--ease-spring) forwards;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-6);
  border-bottom: 1px solid var(--apple-separator);
}

.modal-title {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--apple-label);
}

.modal-close {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--apple-fill);
  cursor: pointer;
  transition: all var(--duration-fast);
}

.modal-close:hover {
  background: var(--apple-fill-secondary);
}

.modal-body {
  padding: var(--space-6);
}

.modal-footer {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-6);
  border-top: 1px solid var(--apple-separator);
  justify-content: flex-end;
}

/* ===== PROGRESS BAR ===== */
.progress-bar {
  width: 100%;
  height: 4px;
  background: var(--apple-fill);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--apple-blue);
  border-radius: var(--radius-full);
  transition: width 0.6s var(--ease-smooth);
}

.progress-bar-fill.animated {
  animation: shimmer 2s ease-in-out infinite;
  background-size: 200% 100%;
}

/* ===== SPINNER ===== */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--apple-fill-tertiary);
  border-top-color: var(--apple-blue);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.spinner-lg {
  width: 32px;
  height: 32px;
  border-width: 3px;
}

.spinner-xl {
  width: 48px;
  height: 48px;
  border-width: 4px;
}

.spinner-white {
  border-color: rgba(255,255,255,0.3);
  border-top-color: white;
}

/* ===== TYPING INDICATOR ===== */
.typing-dots {
  display: flex;
  align-items: center;
  gap: 4px;
}

.typing-dots span {
  width: 8px;
  height: 8px;
  background: var(--apple-gray);
  border-radius: 50%;
  animation: pulse-dot 1.4s ease-in-out infinite;
}

.typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.typing-dots span:nth-child(3) { animation-delay: 0.4s; }

/* ===== SCROLL REVEAL ===== */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s var(--ease-spring),
              transform 0.6s var(--ease-spring);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== PARTICLE BACKGROUND ===== */
.particle-container {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.particle {
  position: absolute;
  border-radius: 50%;
  background: rgba(0, 122, 255, 0.3);
  animation: float linear infinite;
}