/* Mobile-First CSS Optimizations */

/* Root variables for mobile */
:root {
  --touch-target-size: 44px;
  --safe-area-inset-top: env(safe-area-inset-top);
  --safe-area-inset-right: env(safe-area-inset-right);
  --safe-area-inset-bottom: env(safe-area-inset-bottom);
  --safe-area-inset-left: env(safe-area-inset-left);
  
  /* Pull to refresh variables */
  --pull-opacity: 0;
  --pull-ready: 0;
  --pull-refreshing: 0;
  
  /* Performance variables */
  --animation-duration: 0.3s;
  --animation-easing: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* Safe area handling for notched devices */
.safe-area-padding {
  padding-top: max(1rem, var(--safe-area-inset-top));
  padding-right: max(1rem, var(--safe-area-inset-right));
  padding-bottom: max(1rem, var(--safe-area-inset-bottom));
  padding-left: max(1rem, var(--safe-area-inset-left));
}

/* Touch target optimization */
.touch-target {
  min-height: var(--touch-target-size);
  min-width: var(--touch-target-size);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

/* Enhanced touch feedback */
.touch-feedback {
  position: relative;
  overflow: hidden;
  transition: transform 0.1s ease;
}

.touch-feedback::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.3s ease, height 0.3s ease;
  pointer-events: none;
}

.touch-feedback:active {
  transform: scale(0.98);
}

.touch-feedback:active::after {
  width: 200px;
  height: 200px;
}

/* Momentum scrolling for iOS */
.smooth-scroll {
  -webkit-overflow-scrolling: touch;
  overflow-scrolling: touch;
  scroll-behavior: smooth;
}

/* App-like animations */
@keyframes slideInUp {
  from {
    transform: translateY(100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

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

@keyframes scaleIn {
  from {
    transform: scale(0.8);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

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

/* Page transitions */
.page-enter {
  animation: slideInUp var(--animation-duration) var(--animation-easing);
}

.page-exit {
  animation: slideInDown var(--animation-duration) var(--animation-easing) reverse;
}

.modal-enter {
  animation: scaleIn var(--animation-duration) var(--animation-easing);
}

.item-enter {
  animation: fadeInSlide var(--animation-duration) var(--animation-easing);
}

/* Pull to refresh styles */
.pull-to-refresh-container {
  position: relative;
  overflow: hidden;
}

.pull-to-refresh-indicator {
  position: absolute;
  top: -60px;
  left: 50%;
  transform: translateX(-50%);
  opacity: var(--pull-opacity);
  transition: opacity 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.9);
  border-radius: 12px;
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.pull-to-refresh-icon {
  width: 24px;
  height: 24px;
  transition: transform 0.3s ease;
  transform: rotate(calc(var(--pull-ready) * 180deg));
}

.pull-refreshing .pull-to-refresh-icon {
  animation: spin 1s linear infinite;
}

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

/* PWA specific styles */
@media (display-mode: standalone) {
  body {
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
  }
  
  /* Hide scroll bars in standalone mode */
  ::-webkit-scrollbar {
    display: none;
  }
  
  /* Status bar spacing */
  .app-header {
    padding-top: var(--safe-area-inset-top);
  }
}

/* Offline mode styles */
.offline-mode {
  --primary-color: #6b7280;
}

.offline-mode .offline-indicator {
  display: flex !important;
  position: fixed;
  top: var(--safe-area-inset-top);
  left: 0;
  right: 0;
  background: #ef4444;
  color: white;
  padding: 8px 16px;
  text-align: center;
  font-size: 14px;
  z-index: 9999;
  animation: slideInDown 0.3s ease;
}

.offline-indicator {
  display: none;
}

/* Battery save mode */
.battery-save-mode {
  --animation-duration: 0s;
}

.battery-save-mode * {
  animation-duration: 0s !important;
  transition-duration: 0s !important;
}

.battery-save-mode .expensive-animation {
  display: none;
}

/* Mobile navigation styles */
.mobile-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  padding: 8px;
  padding-bottom: max(8px, var(--safe-area-inset-bottom));
  display: flex;
  justify-content: space-around;
  z-index: 50;
}

.mobile-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 8px 12px;
  border-radius: 12px;
  transition: background-color 0.2s ease;
  text-decoration: none;
  color: inherit;
  min-width: var(--touch-target-size);
}

.mobile-nav-item:hover,
.mobile-nav-item.active {
  background-color: rgba(59, 130, 246, 0.1);
  color: #3b82f6;
}

.mobile-nav-icon {
  width: 24px;
  height: 24px;
}

.mobile-nav-label {
  font-size: 12px;
  font-weight: 500;
}

/* Responsive images */
.responsive-image {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 8px;
}

.responsive-image-container {
  position: relative;
  overflow: hidden;
  border-radius: 8px;
}

.responsive-image-placeholder {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

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

/* Touch-friendly form controls */
.mobile-input {
  min-height: var(--touch-target-size);
  padding: 12px 16px;
  border-radius: 12px;
  border: 2px solid #e5e7eb;
  font-size: 16px; /* Prevent zoom on iOS */
  transition: border-color 0.2s ease;
}

.mobile-input:focus {
  border-color: #3b82f6;
  outline: none;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.mobile-button {
  min-height: var(--touch-target-size);
  padding: 12px 24px;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}

.mobile-button:active {
  transform: scale(0.98);
}

/* Swipe gestures visual feedback */
.swipe-container {
  position: relative;
  overflow: hidden;
}

.swipe-hint {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
  background: rgba(0, 0, 0, 0.7);
  color: white;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 14px;
}

.swipe-hint.left {
  left: 20px;
}

.swipe-hint.right {
  right: 20px;
}

.swipe-container:hover .swipe-hint {
  opacity: 1;
}

/* Performance optimizations */
.will-change-transform {
  will-change: transform;
}

.will-change-scroll {
  will-change: scroll-position;
}

.gpu-accelerated {
  transform: translateZ(0);
  backface-visibility: hidden;
}

/* Dark mode optimizations for mobile */
@media (prefers-color-scheme: dark) {
  .mobile-nav {
    background: rgba(17, 24, 39, 0.95);
    border-top-color: rgba(255, 255, 255, 0.1);
  }
  
  .pull-to-refresh-indicator {
    background: rgba(17, 24, 39, 0.9);
  }
  
  .mobile-input {
    background: #1f2937;
    border-color: #374151;
    color: white;
  }
  
  .mobile-input:focus {
    border-color: #60a5fa;
  }
}

/* Landscape orientation adjustments */
@media (orientation: landscape) {
  .mobile-nav {
    display: none; /* Hide bottom nav in landscape */
  }
  
  .landscape-hidden {
    display: none;
  }
  
  .landscape-visible {
    display: block;
  }
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .pull-to-refresh-indicator,
  .touch-feedback,
  .page-enter,
  .modal-enter,
  .item-enter {
    animation: none;
  }
}

/* High contrast mode */
@media (prefers-contrast: high) {
  .mobile-button {
    border: 2px solid currentColor;
  }
  
  .mobile-nav-item:hover,
  .mobile-nav-item.active {
    border: 2px solid currentColor;
  }
}

/* iOS specific fixes */
@supports (-webkit-touch-callout: none) {
  .ios-fix {
    -webkit-appearance: none;
    -webkit-tap-highlight-color: transparent;
  }
  
  .mobile-input {
    -webkit-appearance: none;
    border-radius: 12px;
  }
  
  /* Fix for iOS viewport units */
  .full-height-mobile {
    height: 100vh;
    height: -webkit-fill-available;
  }
}

/* Loading states for lazy content */
.lazy-loading {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 8px;
}

/* PWA install prompt */
.pwa-install-prompt {
  position: fixed;
  bottom: 20px;
  left: 20px;
  right: 20px;
  background: white;
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
  z-index: 1000;
  animation: slideInUp 0.3s ease;
}

.pwa-install-prompt h3 {
  margin: 0 0 8px 0;
  font-size: 18px;
  font-weight: 600;
}

.pwa-install-prompt p {
  margin: 0 0 16px 0;
  color: #6b7280;
  font-size: 14px;
}

.pwa-install-buttons {
  display: flex;
  gap: 12px;
}

.pwa-install-button {
  flex: 1;
  padding: 12px;
  border-radius: 8px;
  border: none;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.pwa-install-button.primary {
  background: #3b82f6;
  color: white;
}

.pwa-install-button.secondary {
  background: #f3f4f6;
  color: #374151;
}

.pwa-install-button:hover {
  transform: translateY(-1px);
}

/* Utility classes */
.no-scroll {
  overflow: hidden;
  position: fixed;
  width: 100%;
}

.no-select {
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

.prevent-zoom {
  touch-action: manipulation;
}

.enable-3d {
  transform-style: preserve-3d;
}

/* Mobile-specific grid layouts */
.mobile-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
}

.mobile-stack {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

@media (min-width: 768px) {
  .mobile-stack {
    flex-direction: row;
  }
}