/* ==========================================================================
   Medical Parasitology Laboratory - Main Stylesheet
   Theme Color: #5170FF
   ========================================================================== */

:root {
  /* Brand Color Palette */
  --primary: #5170FF;
  --primary-hover: #294CF0;
  --primary-dark: #0D31D8;
  --primary-light: #EBEFFF;
  --primary-surface: #F5F7FF;
  --primary-border: #C5CFFF;
  --primary-glow: rgba(81, 112, 255, 0.25);

  /* Section Color Accents */
  --urine-color: #10b981;
  --urine-light: #ecfdf5;
  --urine-border: #a7f3d0;
  
  --stool-color: #f59e0b;
  --stool-light: #fffbeb;
  --stool-border: #fde68a;
  
  --blood-color: #ef4444;
  --blood-light: #fef2f2;
  --blood-border: #fecaca;
  
  --parasites-color: #06b6d4;
  --parasites-light: #ecfeff;
  --parasites-border: #a5f3fc;
  
  --semen-color: #6366f1;
  --semen-light: #eef2ff;
  --semen-border: #c7d2fe;

  /* Neutral Tones (Light Theme Default) */
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --bg-elevated: #ffffff;
  --bg-input: #f1f5f9;
  --bg-tag: #f1f5f9;
  
  --text-main: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-on-primary: #ffffff;
  
  --border-subtle: #e2e8f0;
  --border-strong: #cbd5e1;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 8px 24px var(--primary-glow);

  /* Dimensions & Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  --header-height: 72px;
  --max-width: 1280px;
  
  --transition: all 0.22s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* Dark Theme */
[data-theme="dark"] {
  --bg-main: #0b0f19;
  --bg-card: #131b2e;
  --bg-card-hover: #1a243d;
  --bg-elevated: #1e293b;
  --bg-input: #1e293b;
  --bg-tag: #1e293b;
  
  --text-main: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  
  --border-subtle: #1e293b;
  --border-strong: #334155;
  
  --primary-light: #2a1b3d;
  --primary-surface: #1e1330;
  --primary-border: #52277d;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

/* Base & Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Accessibility */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

img, svg {
  display: block;
  max-width: 100%;
}

/* UI Vector Line Icons */
.ui-icon {
  width: 1.25em;
  height: 1.25em;
  display: inline-block;
  vertical-align: -0.2em;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
  flex-shrink: 0;
  transition: transform 0.2s ease, stroke 0.2s ease, fill 0.2s ease;
}

.action-btn .ui-icon {
  width: 20px;
  height: 20px;
  vertical-align: middle;
}

.pill-btn .ui-icon {
  width: 15px;
  height: 15px;
  vertical-align: -0.15em;
}

.drawer-nav-item .ui-icon {
  width: 18px;
  height: 18px;
  vertical-align: middle;
}

.detail-action-btn .ui-icon {
  width: 15px;
  height: 15px;
  vertical-align: -0.15em;
}

.star-active {
  color: #eab308 !important;
  fill: #eab308 !important;
}

.detail-action-btn.favorited {
  background-color: #fef9c3;
  color: #ca8a04;
}

[data-theme="dark"] .detail-action-btn.favorited {
  background-color: #422006;
  color: #fef08a;
}

.card-arrow-badge .ui-icon {
  width: 16px;
  height: 16px;
}

.menu-item-icon .ui-icon {
  width: 16px;
  height: 16px;
}

.gallery-overlay-badge .ui-icon {
  width: 14px;
  height: 14px;
  vertical-align: -0.15em;
  margin-right: 0.25rem;
}

.lightbox-btn .ui-icon {
  width: 18px;
  height: 18px;
}

.lightbox-nav-btn .ui-icon {
  width: 28px;
  height: 28px;
}

.drawer-close-btn .ui-icon {
  width: 20px;
  height: 20px;
}

.search-clear-btn .ui-icon {
  width: 14px;
  height: 14px;
}

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

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

/* ==========================================================================
   Header & Navbar
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.header-inner {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
  flex-shrink: 0;
}

.brand-logo-stack {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.brand-icon-svg {
  width: 38px;
  height: 38px;
  color: var(--primary);
}

.brand-icon-png {
  width: 28px;
  height: 28px;
  object-fit: contain;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.brand-subtitle {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  white-space: nowrap;
}

/* Search Bar in Header */
.header-search {
  flex: 1;
  max-width: 480px;
  position: relative;
}

.search-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 0.85rem;
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  pointer-events: none;
}

.search-input {
  width: 100%;
  height: 40px;
  padding: 0 2.2rem 0 2.5rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-input);
  color: var(--text-main);
  font-size: 0.875rem;
  transition: var(--transition);
}

.search-input:focus {
  border-color: var(--primary);
  background-color: var(--bg-card);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.search-clear-btn {
  position: absolute;
  right: 0.6rem;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: var(--text-muted);
  font-size: 1rem;
  transition: var(--transition);
  visibility: hidden;
}

.search-clear-btn.visible {
  visibility: visible;
}

.search-clear-btn:hover {
  background-color: var(--border-subtle);
  color: var(--text-main);
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  background-color: var(--bg-input);
  transition: var(--transition);
  font-size: 1.1rem;
}

.action-btn:hover {
  background-color: var(--primary-light);
  color: var(--primary);
}

.action-btn.active {
  background-color: var(--primary);
  color: #ffffff;
}

/* ==========================================================================
   Hero Banner & Author Section
   ========================================================================== */
.hero-section {
  background: linear-gradient(135deg, #5170FF 0%, #0D31D8 100%);
  color: #ffffff;
  padding: 2.5rem 0 2rem;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, rgba(255,255,255,0) 70%);
  pointer-events: none;
}

.hero-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  position: relative;
  z-index: 1;
}

.hero-info {
  max-width: 680px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.3rem 0.8rem;
  background: rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 0.85rem;
  letter-spacing: 0.02em;
}

.hero-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 0.75rem;
  text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.hero-author {
  font-size: 1.1rem;
  font-weight: 600;
  opacity: 0.95;
  margin-bottom: 0.25rem;
}

.hero-position {
  font-size: 0.875rem;
  opacity: 0.85;
  line-height: 1.4;
  white-space: pre-line;
}

.hero-logos {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: rgba(255, 255, 255, 0.12);
  padding: 1rem 1.5rem;
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.hero-logo-img {
  height: 54px;
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.15));
}

/* ==========================================================================
   Navigation Bar & Breadcrumbs
   ========================================================================== */
.nav-breadcrumbs-bar {
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.75rem 0;
  position: sticky;
  top: var(--header-height);
  z-index: 40;
  transition: background-color 0.3s ease;
}

.nav-breadcrumbs-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  font-size: 0.875rem;
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
}

.breadcrumb-item:hover {
  color: var(--primary);
}

.breadcrumb-item.active {
  color: var(--primary);
  font-weight: 600;
  pointer-events: none;
}

.breadcrumb-separator {
  color: var(--text-muted);
  font-size: 0.75rem;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-md);
  background-color: var(--bg-input);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  transition: var(--transition);
}

.back-btn:hover {
  background-color: var(--primary-light);
  color: var(--primary);
}

/* Quick Categories Pills */
.categories-pills {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  overflow-x: auto;
  padding: 0.5rem 0;
  scrollbar-width: none;
}

.categories-pills::-webkit-scrollbar {
  display: none;
}

.pill-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-full);
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.825rem;
  font-weight: 600;
  white-space: nowrap;
  transition: var(--transition);
}

.pill-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-1px);
}

.pill-btn.active {
  background-color: var(--primary);
  border-color: var(--primary);
  color: #ffffff;
  box-shadow: 0 2px 8px var(--primary-glow);
}

/* ==========================================================================
   Main Content Area & Views
   ========================================================================== */
.main-wrapper {
  flex: 1;
  padding: 2rem 0 4rem;
}

/* View transitions */
.view-container {
  animation: fadeIn 0.25s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Section Header */
.section-header {
  margin-bottom: 1.75rem;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.section-subtitle {
  font-size: 0.925rem;
  color: var(--text-secondary);
  margin-top: 0.35rem;
  max-width: 800px;
}

/* Category Grid on Home */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.category-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background-color: var(--card-accent, var(--primary));
  transition: height 0.2s ease;
}

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

.category-card:hover::before {
  height: 6px;
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.card-icon-box {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background-color: var(--card-light, var(--primary-light));
  color: var(--card-accent, var(--primary));
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.card-icon-box img, .card-icon-box svg {
  width: 32px;
  height: 32px;
}

.category-card:hover .card-icon-box {
  transform: scale(1.08);
}

.card-arrow-badge {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--bg-input);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: var(--transition);
}

.category-card:hover .card-arrow-badge {
  background-color: var(--card-accent, var(--primary));
  color: #ffffff;
  transform: translateX(3px);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.card-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ==========================================================================
   Screen & Submenu Button Grids
   ========================================================================== */
.menu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.menu-item-btn {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  color: var(--text-main);
  text-align: left;
  font-size: 0.95rem;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.menu-item-btn::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background-color: var(--primary);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.menu-item-btn:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
  background-color: var(--bg-card-hover);
  box-shadow: var(--shadow-md);
  color: var(--primary);
}

.menu-item-btn:hover::before {
  opacity: 1;
}

.menu-item-icon {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  flex-shrink: 0;
  transition: var(--transition);
}

.menu-item-btn:hover .menu-item-icon {
  color: var(--primary);
  transform: translateX(4px);
}

/* ==========================================================================
   Medical Detail View & Formatting Engine
   ========================================================================== */
.detail-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 2rem;
}

.detail-header {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 1.25rem;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.detail-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary);
}

.detail-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.detail-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-md);
  background-color: var(--bg-input);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  transition: var(--transition);
}

.detail-action-btn:hover {
  background-color: var(--primary-light);
  color: var(--primary);
}

.detail-action-btn.favorited {
  background-color: #fee2e2;
  color: #ef4444;
}

/* Content Text Styling */
.formatted-content {
  font-size: 1rem;
  color: var(--text-main);
  line-height: 1.8;
}

.content-paragraph {
  margin-bottom: 1rem;
}

.content-list {
  list-style: none;
  padding-left: 0;
  margin: 1rem 0;
}

.content-list-item {
  position: relative;
  padding-left: 1.75rem;
  margin-bottom: 0.75rem;
  line-height: 1.6;
}

.content-list-item::before {
  content: '';
  position: absolute;
  left: 0.35rem;
  top: 0.55rem;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--primary);
}

.content-list-subitem {
  position: relative;
  padding-left: 2.75rem;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.content-list-subitem::before {
  content: '–';
  position: absolute;
  left: 1.75rem;
  color: var(--primary);
  font-weight: bold;
}

.highlight-label {
  font-weight: 700;
  color: var(--primary-dark);
}

[data-theme="dark"] .highlight-label {
  color: #dfb8ff;
}

/* ==========================================================================
   Image Gallery & Lightbox
   ========================================================================== */
.image-gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-top: 1.75rem;
}

.image-gallery-item {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--bg-input);
  border: 1px solid var(--border-subtle);
  aspect-ratio: 4 / 3;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.image-gallery-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.gallery-thumbnail {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.image-gallery-item:hover .gallery-thumbnail {
  transform: scale(1.04);
}

.gallery-overlay-badge {
  position: absolute;
  bottom: 0.5rem;
  right: 0.5rem;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  color: #ffffff;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.3rem;
  pointer-events: none;
}

/* Lightbox Modal */
.lightbox-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.92);
  backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.lightbox-modal.open {
  opacity: 1;
  visibility: visible;
}

.lightbox-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  color: #ffffff;
  z-index: 10;
}

.lightbox-title {
  font-size: 1rem;
  font-weight: 600;
  opacity: 0.9;
}

.lightbox-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.lightbox-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: var(--transition);
}

.lightbox-btn:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: scale(1.08);
}

.lightbox-body {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  user-select: none;
}

.lightbox-image {
  max-width: 90vw;
  max-height: 80vh;
  object-fit: contain;
  transition: transform 0.2s cubic-bezier(0.2, 0, 0.2, 1);
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
  border-radius: var(--radius-sm);
}

.lightbox-nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  transition: var(--transition);
  z-index: 10;
}

.lightbox-nav-btn:hover {
  background: rgba(255, 255, 255, 0.4);
}

.lightbox-prev { left: 1.5rem; }
.lightbox-next { right: 1.5rem; }

/* ==========================================================================
   YouTube & PDF Embeds
   ========================================================================== */
.video-container {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
  height: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: #000000;
  margin-top: 1.5rem;
  box-shadow: var(--shadow-md);
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.pdf-viewer-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-top: 1.5rem;
  text-align: center;
}

.pdf-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.pdf-title {
  font-weight: 700;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.pdf-frame {
  width: 100%;
  height: 700px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

/* ==========================================================================
   Search Modal / Dropdown
   ========================================================================== */
.search-results-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background-color: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  max-height: 480px;
  overflow-y: auto;
  z-index: 60;
  display: none;
}

.search-results-dropdown.open {
  display: block;
  animation: fadeIn 0.15s ease-out;
}

.search-result-item {
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  color: inherit;
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item:hover, .search-result-item.selected {
  background-color: var(--primary-light);
}

.result-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.result-title {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--primary);
}

.result-category-badge {
  font-size: 0.725rem;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  background-color: var(--bg-tag);
  color: var(--text-secondary);
  font-weight: 600;
}

.result-path {
  font-size: 0.775rem;
  color: var(--text-muted);
}

.result-snippet {
  font-size: 0.825rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.search-highlight {
  background-color: #fde047;
  color: #854d0e;
  padding: 0.05rem 0.2rem;
  border-radius: 3px;
  font-weight: 600;
}

.no-results-msg {
  padding: 2rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ==========================================================================
   Drawer / Sidebar for Mobile & Quick Atlas
   ========================================================================== */
.sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 90;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.sidebar-overlay.open {
  opacity: 1;
  visibility: visible;
}

.sidebar-drawer {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 340px;
  max-width: 85vw;
  background-color: var(--bg-card);
  box-shadow: var(--shadow-xl);
  z-index: 95;
  transform: translateX(-100%);
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
}

.sidebar-drawer.open {
  transform: translateX(0);
}

.drawer-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.drawer-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
}

.drawer-close-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
}

.drawer-body {
  flex: 1;
  overflow-y: auto;
  padding: 1rem 0;
}

.drawer-nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.5rem;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.925rem;
  text-decoration: none;
  transition: var(--transition);
}

.drawer-nav-item:hover, .drawer-nav-item.active {
  background-color: var(--primary-light);
  color: var(--primary);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background-color: var(--bg-card);
  border-top: 1px solid var(--border-subtle);
  padding: 2.5rem 0 1.5rem;
  margin-top: auto;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.footer-author-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.footer-author-name {
  font-weight: 700;
  color: var(--text-main);
}

.footer-stores {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border-subtle);
}

.store-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  height: 44px;
  padding: 0 0.95rem 0 0.7rem;
  background: #000;
  color: #fff;
  border: 1px solid #3f3f3f;
  border-radius: 8px;
  text-decoration: none;
  transition: var(--transition);
}

.store-badge:hover {
  transform: translateY(-1px);
  border-color: #6b6b6b;
}

.store-badge:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.store-badge-icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
}

.store-badge-text {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
  text-align: left;
}

.store-badge-kicker {
  font-size: 0.58rem;
  font-weight: 400;
  letter-spacing: 0.01em;
  opacity: 0.92;
}

.store-badge-name {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.footer-bottom {
  padding-top: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-credits {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-coderbot {
  height: 28px;
  width: auto;
  object-fit: contain;
}

/* ==========================================================================
   Print Styles
   ========================================================================== */
@media print {
  .site-header, .hero-section, .nav-breadcrumbs-bar, .site-footer, .header-actions, .lightbox-modal, .search-results-dropdown {
    display: none !important;
  }
  
  body {
    background: #ffffff;
    color: #000000;
  }
  
  .detail-card {
    border: none;
    box-shadow: none;
    padding: 0;
  }
  
  .image-gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 900px) {
  .hero-content {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .hero-logos {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 640px) {
  .header-search {
    display: none; /* Can be opened via search button on mobile */
  }
  
  .header-search.mobile-active {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--bg-card);
    padding: 0.5rem 1rem;
    z-index: 60;
    max-width: none;
  }
  
  .category-grid {
    grid-template-columns: 1fr;
  }
  
  .menu-grid {
    grid-template-columns: 1fr;
  }
  
  .image-gallery-grid {
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  }
}