/* ===================================
   CSS Variables for Easy Theming
   =================================== */
:root {
  /* Colors - easily changeable */
  --primary-color: #4A90E2;
  --primary-hover: #357ABD;
  --secondary-color: #F39C12;
  --text-color: #333333;
  --text-light: #666666;
  --background: #FFFFFF;
  --background-light: #F8F9FA;
  --border-color: #E0E0E0;
  --shadow: rgba(0, 0, 0, 0.1);
  --shadow-hover: rgba(0, 0, 0, 0.2);

  /* Spacing */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-xxl: 64px;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-size-base: 14px;
  --font-size-lg: 18px;
  --font-size-xl: 22px;
  --font-size-xxl: 30px;
  --font-weight-normal: 400;
  --font-weight-bold: 700;

  /* Layout */
  --max-width: 1200px;
  --border-radius: 8px;
  --transition: all 0.3s ease;
}

/* ===================================
   Reset & Base Styles
   =================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  color: var(--text-color);
  background-color: var(--background);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--primary-hover);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ===================================
   Accessibility
   =================================== */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--primary-color);
  color: white;
  padding: 0;
  z-index: 100;
}

.skip-link:focus {
  top: 0;
}

/* ===================================
   Header Styles
   =================================== */
.site-header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 2px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 2px 4px var(--shadow);
  height: 50px;
}

.header-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
  height: 50px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Logo Icon - Left side */
.site-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  font-size: 1.5rem;
  line-height: 1;
  flex-shrink: 0;
}

.logo-icon {
  display: block;
}

/* Mobile Menu Toggle - Right side */
.menu-checkbox {
  display: none;
}

.menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  padding: 8px;
  background: var(--background-light);
  border-radius: var(--border-radius);
  width: 40px;
  height: 40px;
  cursor: pointer;
  position: relative;
  transition: all 0.3s ease;
  flex-shrink: 0;
}

.menu-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-color);
  transition: all 0.3s ease;
  border-radius: 2px;
  position: relative;
}

/* Transform to X when checkbox is checked */
.menu-checkbox:checked ~ .menu-toggle .menu-bar:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-checkbox:checked ~ .menu-toggle .menu-bar:nth-child(2) {
  opacity: 0;
}

.menu-checkbox:checked ~ .menu-toggle .menu-bar:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Show menu when checkbox is checked */
.menu-checkbox:checked ~ .category-nav-mobile {
  display: block;
}

/* Category Navigation - Mobile Only */
.category-nav-mobile {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--background);
  border-bottom: 2px solid var(--border-color);
  box-shadow: 0 4px 6px var(--shadow);
}

.category-nav-mobile.active {
  display: block;
}

.category-menu {
  list-style: none;
  padding: var(--spacing-sm);
}

.category-menu li {
  margin-bottom: var(--spacing-xs);
}

.nav-link {
  display: block;
  padding: var(--spacing-sm);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  color: var(--text-color);
  border-radius: var(--border-radius);
  transition: var(--transition);
}

.nav-link:hover {
  background: var(--background-light);
  color: var(--primary-color);
}

/* Breadcrumbs at Bottom of Page */
.breadcrumbs-bottom {
  margin-top: var(--spacing-xxl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
}

.breadcrumbs-bottom ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--text-light);
}

.breadcrumbs-bottom li {
  display: flex;
  align-items: center;
}

.breadcrumbs-bottom li:not(:last-child)::after {
  content: '›';
  margin-left: var(--spacing-xs);
  color: var(--text-light);
  font-weight: var(--font-weight-bold);
}

.breadcrumbs-bottom a {
  color: var(--primary-color);
  text-decoration: none;
  transition: var(--transition);
}

.breadcrumbs-bottom a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

.breadcrumbs-bottom span {
  color: var(--text-color);
  font-weight: var(--font-weight-medium);
}

/* Category Card (for subcategories) */
.category-card {
  display: block;
  background: var(--background);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  overflow: hidden;
  text-decoration: none;
  transition: var(--transition);
  box-shadow: 0 2px 8px var(--shadow);
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 16px var(--shadow-hover);
  border-color: var(--primary-color);
}

.category-card-image {
  width: 100%;
  height: 200px;
  overflow: hidden;
  background: var(--background-light);
}

.category-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.category-card:hover .category-card-image img {
  transform: scale(1.05);
}

.category-card-content {
  padding: var(--spacing-md);
}

.category-card-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-xs);
  color: var(--text-color);
}

.category-card-description {
  font-size: var(--font-size-sm);
  color: var(--text-light);
  line-height: 1.5;
  margin: 0;
}

/* ===================================
   Category Navigation - Desktop/Tablet
   =================================== */
.category-nav-desktop {
  display: none; /* Hidden on mobile */
}

/* ===================================
   Main Content
   =================================== */
.main-content {
  min-height: 60vh;
  padding: var(--spacing-lg) var(--spacing-sm);
}

/* Loader */
.loader {
  text-align: center;
  padding: var(--spacing-xxl);
}

.spinner {
  width: 50px;
  height: 50px;
  margin: 0 auto var(--spacing-md);
  border: 4px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* ===================================
   Home Page - Large Category Tiles
   =================================== */
.home-hero {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.home-hero h2 {
  font-size: var(--font-size-xxl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-md);
  color: var(--text-color);
}

.home-hero p {
  font-size: var(--font-size-lg);
  color: var(--text-light);
  max-width: 800px;
  margin: 0 auto;
}

.category-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  max-width: var(--max-width);
  margin: 0 auto var(--spacing-xl);
}

/* Large Category Tile */
.category-tile {
  background: var(--background);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 2px 8px var(--shadow);
}

.category-tile:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 16px var(--shadow-hover);
  border-color: var(--primary-color);
}

.category-tile-image {
  width: 100%;
  height: 250px;
  object-fit: cover;
  background: var(--background-light);
}

.category-tile-content {
  padding: var(--spacing-lg);
  text-align: center;
}

.category-tile-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
  color: var(--text-color);
}

.category-tile-description {
  font-size: var(--font-size-base);
  color: var(--text-light);
  line-height: 1.6;
}

/* Popular Section */
/* .popular-section { */
/*   margin-top: var(--spacing-xxl); */
/*   padding-top: var(--spacing-xl); */
/*   border-top: 2px solid var(--border-color); */
/* } */

/* .section-title { */
/*   font-size: var(--font-size-xxl); */
/*   font-weight: var(--font-weight-bold); */
/*   text-align: center; */
/*   margin-bottom: var(--spacing-lg); */
/*   color: var(--text-color); */
/* } */

/* ===================================
   Category Page - Image Gallery
   =================================== */
.category-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.category-title {
  font-size: var(--font-size-xxl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
}

.category-description {
  font-size: var(--font-size-lg);
  color: var(--text-light);
}

.image-gallery {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  max-width: var(--max-width);
  margin: 0 auto;
}

/* Image Card */
.image-card {
  background: var(--background);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  text-align: center;
  transition: var(--transition);
  box-shadow: 0 2px 8px var(--shadow);
}

.image-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 12px var(--shadow-hover);
}

.image-card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-md);
  color: var(--text-color);
}

.image-card-thumbnail {
  width: 100%;
  max-width: 400px;
  margin: 0 auto var(--spacing-md);
  cursor: pointer;
  border-radius: var(--border-radius);
  transition: var(--transition);
}

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

.image-card-thumbnail img {
  width: 100%;
  height: auto;
  border-radius: var(--border-radius);
}

.image-card-description {
  font-size: var(--font-size-base);
  color: var(--text-light);
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

.image-card-actions {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  text-align: center;
  border-radius: var(--border-radius);
  transition: var(--transition);
  cursor: pointer;
}

.btn-primary {
  background: var(--primary-color);
  color: white;
  border: 2px solid var(--primary-color);
}

.btn-primary:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
  color: white;
}

.btn-secondary {
  background: white;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
  background: var(--primary-color);
  color: white;
}

/* ===================================
   Image Detail Page
   =================================== */
.image-detail {
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}

.image-detail-title {
  font-size: var(--font-size-xxl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-lg);
}

.image-detail-container {
  background: var(--background);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
  box-shadow: 0 4px 12px var(--shadow);
}

.image-detail-full {
  width: 100%;
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
  border-radius: var(--border-radius);
}

.image-detail-description {
  font-size: var(--font-size-lg);
  color: var(--text-light);
  margin-bottom: var(--spacing-lg);
  line-height: 1.8;
}

.image-detail-actions {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

/* ===================================
   Static Pages
   =================================== */
.static-page {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-sm);
}

.static-page h2 {
  font-size: var(--font-size-xxl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

.static-page h3 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.static-page p {
  font-size: var(--font-size-base);
  line-height: 1.8;
  margin-bottom: var(--spacing-md);
  color: var(--text-color);
}

.static-page ul {
  margin-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.static-page li {
  margin-bottom: var(--spacing-xs);
  line-height: 1.6;
}

/* ===================================
   Ad Placeholders
   =================================== */
.ad-banner {
  background: var(--background-light);
  border: 1px dashed var(--border-color);
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: var(--spacing-md) 0;
}

/* ===================================
   Footer
   =================================== */
.site-footer {
  background: var(--background-light);
  border-top: 2px solid var(--border-color);
  padding: var(--spacing-xl) var(--spacing-sm);
  margin-top: var(--spacing-xxl);
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.footer-links a {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--text-color);
}

.footer-copyright {
  font-size: 14px;
  color: var(--text-light);
}

/* ===================================
   Responsive Design - Tablet
   =================================== */
@media (min-width: 768px) {
  /* Hide mobile menu on tablet/desktop */
  .menu-toggle {
    display: none;
  }

  .category-nav-mobile {
    display: none !important;
  }

  /* Subtitle larger on tablet/desktop */
  .site-subtitle {
    font-size: 1rem;
  }

  /* Show desktop category navigation */
  .category-nav-desktop {
    display: block;
    background: var(--background-light);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 4px var(--shadow);
    max-width: var(--max-width);
    margin: 0 auto var(--spacing-xl);
  }

  .category-nav-list {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    padding: 0;
    margin: 0;
  }

  .category-nav-link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--background);
    color: var(--text-color);
    font-weight: var(--font-weight-bold);
    border-radius: var(--border-radius);
    transition: var(--transition);
    border: 2px solid var(--border-color);
  }

  .category-nav-link:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-2px);
  }

  .category-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .image-gallery {
    grid-template-columns: repeat(2, 1fr);
  }

  .image-card-actions {
    flex-direction: row;
    justify-content: center;
  }

  .image-detail-actions {
    flex-direction: row;
    justify-content: center;
  }
}

/* ===================================
   Responsive Design - Desktop
   =================================== */
@media (min-width: 1024px) {
  .header-container {
    padding: var(--spacing-lg) var(--spacing-md);
  }

  .site-title {
    font-size: var(--font-size-xxl);
  }

  .category-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .image-gallery {
    grid-template-columns: repeat(3, 1fr);
  }

  .main-content {
    padding: var(--spacing-xxl) var(--spacing-md);
  }
}

/* ===================================
   Lazy Loading
   =================================== */
.lazy-image {
  opacity: 0;
  transition: opacity 0.3s ease-in;
}

.lazy-image.loaded {
  opacity: 1;
}

/* Loading placeholder */
.image-placeholder {
  background: linear-gradient(90deg, var(--background-light) 25%, #e0e0e0 50%, var(--background-light) 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
}

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

/* ===================================
   Utility Classes
   =================================== */
.text-center {
  text-align: center;
}

.hidden {
  display: none;
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

.mb-lg {
  margin-bottom: var(--spacing-lg);
}