:root {
  --arrow-width: 80px;
  --grid-gap: 15px;
  --theme-dark: #212529;
  --theme-light: #f8f9fa;
  --primary-font: 'Cairo', sans-serif;
  --transition-speed: 0.3s;
}

* {
  font-family: var(--primary-font);
}

body {
  background-color: var(--theme-light);
  overscroll-behavior: contain; /* Prevent pull-to-refresh on mobile */
}

/* Gallery Container */
.gallery-container {
  position: relative;
  padding: 2rem 0;
  min-height: 50vh; /* Ensure there's space even when empty */
}

/* Gallery Grid */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--grid-gap);
  padding: var(--grid-gap);
  margin: 0 var(--arrow-width);
  max-width: 1600px;
  margin-left: auto;
  margin-right: auto;
}

/* Gallery Items */
.gallery-item {
  position: relative;
  aspect-ratio: 1;
  border-radius: 12px;
  overflow: hidden;
  background: white;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  transition: all var(--transition-speed) cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
}

.gallery-item:hover {
  transform: translateY(-8px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.gallery-item a {
  flex: 1;
  display: flex; /* To properly center the image */
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 0.5s ease, transform var(--transition-speed) ease;
  will-change: transform, opacity; /* Performance optimization */
}

.gallery-item img.loaded {
  opacity: 1;
}

.gallery-item:hover img {
  transform: scale(1.05);
}

/* Image Caption */
.image-caption {
  padding: 0.5rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--theme-dark);
  background-color: rgba(255, 255, 255, 0.9);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  border-top: 1px solid rgba(0, 0, 0, 0.05);
}

/* Error Overlay */
.error-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Navigation Arrows */
.nav-arrow {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  width: var(--arrow-width);
  height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--theme-dark);
  cursor: pointer;
  transition: all var(--transition-speed) cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1000;
}

/* RTL-specific positioning */
.nav-prev {
  right: 0;
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
  border-top-left-radius: 20px;
  border-bottom-left-radius: 20px;
}

.nav-next {
  left: 0;
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
  border-top-right-radius: 20px;
  border-bottom-right-radius: 20px;
}

.nav-arrow:not(.disabled):hover {
  background: #2c3237;
  width: calc(var(--arrow-width) + 20px);
}

.nav-arrow.disabled {
  background: rgba(33, 37, 41, 0.6);
  cursor: not-allowed;
}

.nav-arrow i {
  font-size: 3rem;
  color: white;
  transition: transform var(--transition-speed) ease;
}

.nav-arrow:not(.disabled):hover i {
  transform: scale(1.1);
}

/* Loading Spinner */
.loading-spinner {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: none;
  z-index: 1000;
  background: rgba(33, 37, 41, 0.9);
  padding: 2rem;
  border-radius: 15px;
  text-align: center;
  backdrop-filter: blur(5px); /* Modern blur effect */
}

.loading-spinner.active {
  display: block;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

.loading-spinner .spinner-border {
  animation: pulse 1.5s infinite ease-in-out;
}

/* Pagination */
.pagination-container {
  background: white;
  padding: 1rem;
  border-radius: 12px;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.05);
  margin: 2rem auto;
  max-width: 300px;
  transition: transform var(--transition-speed) ease;
}

.pagination-container:hover {
  transform: translateY(-5px);
}

.pagination-info {
  font-size: 1.1rem;
  color: var(--theme-dark);
}

/* Footer Styles */
.social-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  margin-top: 1rem;
}

.social-links a {
  color: #fff;
  font-size: 2rem;
  text-decoration: none;
  transition: opacity var(--transition-speed) ease;
}

.social-links a:hover,
.social-links a:focus {
  opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 1200px) {
  :root {
    --arrow-width: 70px;
  }
  
  .gallery-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  }
  
  .nav-arrow {
    height: 150px;
  }
  
  .nav-arrow i {
    font-size: 2.5rem;
  }
}

@media (max-width: 768px) {
  :root {
    --arrow-width: 50px;
    --grid-gap: 12px;
  }
  
  .gallery-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  }
  
  .nav-arrow {
    height: 120px;
  }
  
  .nav-arrow i {
    font-size: 2rem;
  }
  
  .social-links a {
    font-size: 1.75rem;
  }
  
  /* Better mobile navigation */
  .nav-arrow {
    opacity: 0.7;
  }
  
  .nav-arrow:not(.disabled):active {
    opacity: 1;
  }
}

@media (max-width: 480px) {
  :root {
    --arrow-width: 40px;
    --grid-gap: 10px;
  }
  
  .gallery-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  }
  
  .nav-arrow {
    height: 100px;
  }
  
  .nav-arrow i {
    font-size: 1.5rem;
  }
  
  .social-links a {
    font-size: 1.5rem;
  }
  
  .image-caption {
    font-size: 0.75rem;
    padding: 0.25rem;
  }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  body {
    background-color: #121212;
    color: #f8f9fa;
  }
  
  .pagination-container,
  .gallery-item {
    background-color: #212121;
    color: #f8f9fa;
  }
  
  .pagination-info {
    color: #f8f9fa;
  }
  
  .image-caption {
    background-color: rgba(33, 33, 33, 0.9);
    color: #f8f9fa;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }
}