/* Performance and Lazy Loading Styles */

/* Lazy Loading Image States */
img.lazy {
  opacity: 1;
  transition: opacity 0.3s ease-in-out;
}

img.loaded {
  opacity: 1;
}

img.loading {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
}

img.error {
  background: #f3f4f6;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #9ca3af;
  font-size: var(--font-size-sm);
}

img.error::after {
  content: "Failed to load image";
}

/* Skeleton Loading Animation */
@keyframes skeleton-loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* Enhanced Form Validation */
input.valid {
  border-color: #10b981;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

input.invalid {
  border-color: #ef4444;
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

/* Donation Modal */
.donation-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.donation-modal.show {
  opacity: 1;
  visibility: visible;
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(5px);
}

.modal-content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: white;
  border-radius: var(--radius-3xl);
  box-shadow: var(--shadow-xl);
  max-width: 500px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
}

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

.modal-header h3 {
  margin: 0;
  color: var(--text-primary);
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: var(--spacing-2);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  color: var(--text-primary);
  background: var(--background-light);
}

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

.donation-preview {
  margin: var(--spacing-6) 0;
}

.preview-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  margin-bottom: var(--spacing-4);
  padding: var(--spacing-3);
  background: var(--background-light);
  border-radius: var(--radius-lg);
}

.preview-item i {
  color: var(--primary-color);
  font-size: var(--font-size-lg);
}

.modal-actions {
  display: flex;
  gap: var(--spacing-4);
  margin-top: var(--spacing-6);
}

/* FAQ Search */
.faq-search {
  margin-bottom: var(--spacing-8);
}

.faq-search .search-box {
  position: relative;
  max-width: 400px;
  margin: 0 auto;
}

.faq-search-input {
  width: 100%;
  padding: var(--spacing-4);
  padding-right: 50px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: var(--font-size-base);
  transition: all var(--transition-fast);
}

.faq-search-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(22, 163, 74, 0.1);
}

.search-icon {
  position: absolute;
  right: var(--spacing-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
  pointer-events: none;
}

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

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

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .btn-primary {
    border: 2px solid currentColor;
  }

  .btn-outline {
    background: white;
  }
}

/* Dark mode support (for future implementation) */
@media (prefers-color-scheme: dark) {
  :root {
    --background-white: #1f2937;
    --background-light: #374151;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --border-color: #4b5563;
  }
}

/* Print styles */
@media print {
  .header,
  .back-to-top,
  .donation-modal,
  .floating-element {
    display: none !important;
  }

  .hero {
    min-height: auto;
    padding: var(--spacing-8) 0;
  }

  .hero-background {
    display: none;
  }

  * {
    color: black !important;
    background: white !important;
  }
}

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

.critical-content.loaded {
  background: none;
  animation: none;
}

/* Intersection Observer fallback */
.no-intersection-observer img.lazy {
  opacity: 1;
}

/* Resource hints for better performance */
.preload-hint {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

/* Optimize font loading */
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: local("Inter Regular"), local("Inter-Regular");
}

@font-face {
  font-family: "Poppins";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: local("Poppins Bold"), local("Poppins-Bold");
}

/* Optimize animations for better performance */
.optimized-animation {
  transform: translateZ(0);
  backface-visibility: hidden;
  perspective: 1000px;
}

/* Lazy load sections */
.lazy-section {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.lazy-section.loaded {
  opacity: 1;
  transform: translateY(0);
}

/* Critical CSS inlining support */
.above-fold {
  /* Styles for above-the-fold content */
  display: block;
}

.below-fold {
  /* Styles for below-the-fold content */
  display: block;
}

.below-fold.loaded {
  display: block;
}

/* Service Worker support indicators */
.sw-update-available {
  position: fixed;
  bottom: var(--spacing-4);
  left: var(--spacing-4);
  background: var(--primary-color);
  color: white;
  padding: var(--spacing-3) var(--spacing-4);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  z-index: 1000;
  transform: translateY(100px);
  transition: transform var(--transition-normal);
}

.sw-update-available.show {
  transform: translateY(0);
}

/* Optimize images for different screen densities */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .high-dpi-image {
    /* High DPI image optimizations */
  }
}

/* Connection-aware loading */
@media (max-width: 768px) and (max-resolution: 150dpi) {
  .low-bandwidth-optimization {
    /* Optimizations for low bandwidth connections */
    background-image: none;
  }
}