/* ==========================================================================
   LUMINA Image Gallery - Modern, Responsive & Interactive Stylesheet
   ========================================================================== */

/* --- CSS Variables & Theme Tokens --- */
:root {
  /* Hue & Primary Accents */
  --primary-hue: 250;
  --primary: hsl(var(--primary-hue), 90%, 65%);
  --primary-hover: hsl(var(--primary-hue), 95%, 72%);
  --primary-glow: hsla(var(--primary-hue), 90%, 65%, 0.35);
  
  --accent-cyan: #06b6d4;
  --accent-pink: #ec4899;
  --accent-amber: #f59e0b;
  --accent-emerald: #10b981;

  /* Dark Theme Default */
  --bg-main: #0a0c10;
  --bg-surface: rgba(18, 22, 32, 0.75);
  --bg-surface-solid: #121620;
  --bg-card: rgba(22, 27, 40, 0.8);
  --bg-card-hover: rgba(28, 35, 52, 0.95);
  --bg-input: rgba(13, 17, 26, 0.9);
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: hsla(var(--primary-hue), 90%, 65%, 0.6);
  --border-card: rgba(255, 255, 255, 0.1);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0f172a;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 25px var(--primary-glow);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-pill: 9999px;

  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.45s cubic-bezier(0.16, 1, 0.3, 1);

  --glass-blur: blur(16px);
  --glass-border: 1px solid var(--border-subtle);
}

/* Light Theme Overrides */
[data-theme="light"] {
  --bg-main: #f8fafc;
  --bg-surface: rgba(255, 255, 255, 0.85);
  --bg-surface-solid: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-card-hover: #ffffff;
  --bg-input: rgba(241, 245, 249, 0.95);
  
  --border-subtle: rgba(0, 0, 0, 0.08);
  --border-card: rgba(0, 0, 0, 0.06);
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-inverse: #ffffff;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 10px 25px -3px rgba(0, 0, 0, 0.08), 0 4px 10px -2px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 20px 35px -5px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 20px hsla(var(--primary-hue), 80%, 55%, 0.25);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  color-scheme: dark light;
}

body {
  font-family: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  transition: background-color var(--transition-base), color var(--transition-base);
}

/* Background Ambient Glows */
.bg-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.15;
  pointer-events: none;
  z-index: 0;
  transition: opacity var(--transition-base);
}

.bg-glow-1 {
  width: 500px;
  height: 500px;
  background: var(--primary);
  top: -150px;
  right: -100px;
}

.bg-glow-2 {
  width: 450px;
  height: 450px;
  background: var(--accent-cyan);
  bottom: 50px;
  left: -120px;
}

/* --- App Layout --- */
.app-container {
  max-width: 1540px;
  margin: 0 auto;
  padding: 1.5rem 2rem 3rem;
  position: relative;
  z-index: 1;
}

/* --- Header Section --- */
.app-header {
  margin-bottom: 2rem;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1rem 1.5rem;
  background: var(--bg-surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.brand-icon {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--primary), var(--accent-cyan));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.3rem;
  box-shadow: 0 4px 15px var(--primary-glow);
}

.brand-text h1 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.1;
  color: var(--text-primary);
}

.brand-accent {
  color: var(--primary);
}

.tagline {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.stats-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.9rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.stats-badge i {
  color: var(--primary);
}

/* Icon Buttons */
.icon-btn {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 1.05rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.icon-btn:active {
  transform: translateY(0);
}

/* Theme Toggle Icons */
[data-theme="dark"] .light-icon { display: block; }
[data-theme="dark"] .dark-icon { display: none; }
[data-theme="light"] .light-icon { display: none; }
[data-theme="light"] .dark-icon { display: block; }

/* --- Controls Section --- */
.controls-section {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.search-and-tools {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

/* Search Box */
.search-box {
  flex: 1 1 340px;
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 1.1rem;
  color: var(--text-muted);
  font-size: 1rem;
  pointer-events: none;
  transition: color var(--transition-fast);
}

.search-box input {
  width: 100%;
  padding: 0.8rem 2.8rem 0.8rem 2.8rem;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  font-size: 0.92rem;
  font-family: inherit;
  color: var(--text-primary);
  outline: none;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

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

.search-box input:focus + .clear-search-btn,
.search-box:focus-within .search-icon {
  color: var(--primary);
}

.clear-search-btn {
  position: absolute;
  right: 0.9rem;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.95rem;
  padding: 0.3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: color var(--transition-fast);
}

.clear-search-btn:hover {
  color: var(--text-primary);
}

/* Toolbar Dropdowns */
.toolbar-dropdowns {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.9rem;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-surface);
  backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-md);
  font-size: 0.84rem;
  color: var(--text-secondary);
}

.control-group label i {
  color: var(--primary);
  margin-right: 2px;
}

.control-group select {
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
  outline: none;
  padding: 0.2rem 0.4rem;
}

.control-group select option {
  background-color: var(--bg-surface-solid);
  color: var(--text-primary);
}

/* View Mode Switcher */
.view-mode-toggle {
  display: flex;
  align-items: center;
  background: var(--bg-surface);
  border: var(--glass-border);
  border-radius: var(--radius-md);
  padding: 3px;
  gap: 3px;
}

.view-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.view-btn:hover {
  color: var(--text-primary);
}

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

/* Category Filter Navigation */
.category-nav {
  position: relative;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: thin;
}

.category-pills {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-width: max-content;
}

.category-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.6rem 1.15rem;
  background: var(--bg-surface);
  backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.category-pill i {
  font-size: 0.85rem;
  opacity: 0.75;
  transition: opacity var(--transition-fast);
}

.category-pill:hover {
  color: var(--text-primary);
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
  transform: translateY(-1px);
}

.category-pill.active {
  background: linear-gradient(135deg, var(--primary), hsl(var(--primary-hue), 85%, 55%));
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 16px var(--primary-glow);
}

.category-pill.active i {
  opacity: 1;
}

/* Filter Status Bar */
.filter-status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1.25rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
  font-size: 0.86rem;
  color: var(--text-secondary);
}

.text-btn {
  background: none;
  border: none;
  color: var(--primary);
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: opacity var(--transition-fast);
}

.text-btn:hover {
  text-decoration: underline;
  opacity: 0.85;
}

/* --- Gallery Container & Grid --- */
.gallery-container {
  min-height: 480px;
}

/* Standard Grid Layout */
.gallery-grid.view-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.75rem;
}

/* Masonry / Variable Height View */
.gallery-grid.view-masonry {
  column-count: 3;
  column-gap: 1.75rem;
}

.gallery-grid.view-masonry .gallery-card {
  break-inside: avoid;
  margin-bottom: 1.75rem;
}

.gallery-grid.view-masonry .gallery-card:nth-child(2n) .card-media {
  aspect-ratio: 4 / 5;
}

.gallery-grid.view-masonry .gallery-card:nth-child(3n) .card-media {
  aspect-ratio: 3 / 4;
}

.gallery-grid.view-masonry .gallery-card:nth-child(4n) .card-media {
  aspect-ratio: 16 / 10;
}

/* Compact Grid View */
.gallery-grid.view-compact {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 1rem;
}

.gallery-grid.view-compact .card-details {
  padding: 0.75rem;
}

.gallery-grid.view-compact .card-title {
  font-size: 0.95rem;
}

/* --- Gallery Card Design & Hover Animations --- */
.gallery-card {
  position: relative;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-card);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-smooth);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  animation: cardFadeIn 0.5s ease-out forwards;
}

@keyframes cardFadeIn {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.gallery-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg), 0 0 20px rgba(0, 0, 0, 0.2);
  border-color: var(--border-focus);
}

/* Card Media Container */
.card-media {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background-color: rgba(255, 255, 255, 0.03);
}

.gallery-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1), filter var(--transition-base);
  will-change: transform;
}

.gallery-card:hover .gallery-img {
  transform: scale(1.08);
}

/* Image Filter Classes applied dynamically */
.filter-vivid .gallery-img,
.filter-vivid #lightbox-image {
  filter: saturate(1.45) contrast(1.1);
}

.filter-vintage .gallery-img,
.filter-vintage #lightbox-image {
  filter: sepia(0.35) contrast(1.15) brightness(0.95) hue-rotate(-8deg);
}

.filter-noir .gallery-img,
.filter-noir #lightbox-image {
  filter: grayscale(1) contrast(1.3) brightness(0.95);
}

.filter-sepia .gallery-img,
.filter-sepia #lightbox-image {
  filter: sepia(0.85) brightness(0.95) contrast(1.05);
}

.filter-cool .gallery-img,
.filter-cool #lightbox-image {
  filter: hue-rotate(170deg) saturate(1.25) contrast(1.05);
}

.filter-cinematic .gallery-img,
.filter-cinematic #lightbox-image {
  filter: contrast(1.25) brightness(0.88) saturate(1.3);
}

/* Card Category Chip */
.card-category-badge {
  position: absolute;
  top: 1rem;
  left: 1rem;
  z-index: 2;
  padding: 0.35rem 0.75rem;
  background: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #fff;
  transition: transform var(--transition-fast);
}

.gallery-card:hover .card-category-badge {
  transform: scale(1.05);
}

/* Quick Action Buttons on Image Overlay */
.card-quick-actions {
  position: absolute;
  top: 1rem;
  right: 1rem;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  opacity: 0;
  transform: translateX(10px);
  transition: all var(--transition-base);
}

.gallery-card:hover .card-quick-actions {
  opacity: 1;
  transform: translateX(0);
}

.quick-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #fff;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.quick-btn:hover {
  background: var(--primary);
  transform: scale(1.12);
  box-shadow: 0 4px 12px var(--primary-glow);
}

.quick-btn.liked {
  color: #f43f5e;
  background: rgba(244, 63, 94, 0.2);
  border-color: #f43f5e;
}

/* Card Hover Gradient Overlay */
.card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(10, 12, 16, 0.9) 0%,
    rgba(10, 12, 16, 0.4) 40%,
    rgba(10, 12, 16, 0.05) 100%
  );
  opacity: 0;
  display: flex;
  align-items: flex-end;
  padding: 1.25rem;
  transition: opacity var(--transition-base);
}

.gallery-card:hover .card-overlay {
  opacity: 1;
}

.overlay-content {
  width: 100%;
  transform: translateY(12px);
  transition: transform var(--transition-base);
}

.gallery-card:hover .overlay-content {
  transform: translateY(0);
}

.view-photo-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.9rem;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(6px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-pill);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 600;
}

/* Card Details (Always visible below media) */
.card-details {
  padding: 1.1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  background: var(--bg-card);
}

.card-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
}

.card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.card-author {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.card-author i {
  font-size: 0.75rem;
}

.card-likes {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.card-likes.liked i {
  color: #f43f5e;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 4rem 1.5rem;
  background: var(--bg-surface);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  margin: 2rem auto;
  max-width: 500px;
}

.empty-icon {
  font-size: 3.5rem;
  color: var(--primary);
  margin-bottom: 1rem;
}

.empty-state h3 {
  font-size: 1.35rem;
  margin-bottom: 0.5rem;
}

.empty-state p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
}

.primary-btn {
  padding: 0.7rem 1.5rem;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-pill);
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
}

.primary-btn:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

/* --- Lightbox Modal --- */
.lightbox-modal {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
  padding: 0;
}

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

.lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(5, 7, 10, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 1;
}

.lightbox-dialog {
  position: relative;
  z-index: 2;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

/* Lightbox Header */
.lightbox-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.75rem;
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.7) 0%, rgba(0, 0, 0, 0) 100%);
  z-index: 10;
}

.lightbox-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.lightbox-counter {
  padding: 0.35rem 0.8rem;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.05em;
}

.lightbox-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.lightbox-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.lb-btn {
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #fff;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
  overflow: hidden;
}

.lb-btn:hover {
  background: var(--primary);
  border-color: var(--primary);
  transform: scale(1.06);
}

.lb-btn.close-btn:hover {
  background: #ef4444;
  border-color: #ef4444;
}

.slideshow-progress-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: var(--accent-cyan);
  transition: width linear;
}

.zoom-controls {
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-md);
  padding: 2px;
}

.zoom-controls .lb-btn {
  background: transparent;
  border: none;
  width: 34px;
  height: 34px;
}

.zoom-level {
  font-size: 0.78rem;
  font-weight: 700;
  color: #fff;
  padding: 0 0.4rem;
  min-width: 45px;
  text-align: center;
}

/* Lightbox Stage (Center Viewport) */
.lightbox-stage {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 1rem;
  overflow: hidden;
}

.lb-nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 20;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #fff;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lb-nav-btn:hover {
  background: var(--primary);
  transform: translateY(-50%) scale(1.12);
  box-shadow: 0 0 20px var(--primary-glow);
}

.lb-nav-btn.prev-btn { left: 1.5rem; }
.lb-nav-btn.next-btn { right: 1.5rem; }

.lightbox-image-wrapper {
  position: relative;
  max-width: 88vw;
  max-height: 68vh;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: grab;
}

.lightbox-image-wrapper.zoomed {
  cursor: grab;
}

.lightbox-image-wrapper.zoomed:active {
  cursor: grabbing;
}

.lightbox-image {
  max-width: 100%;
  max-height: 68vh;
  object-fit: contain;
  border-radius: var(--radius-md);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8);
  transition: transform 0.25s cubic-bezier(0.2, 0, 0, 1), opacity 0.3s ease;
  user-select: none;
  -webkit-user-drag: none;
}

.lb-spinner {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.2);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.lb-spinner.active {
  opacity: 1;
}

.spinner-ring {
  width: 44px;
  height: 44px;
  border: 3px solid rgba(255, 255, 255, 0.2);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Lightbox Footer */
.lightbox-footer {
  padding: 1rem 1.75rem;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.85) 0%, rgba(0, 0, 0, 0) 100%);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.5rem;
  z-index: 10;
}

.lightbox-caption-area {
  max-width: 75%;
}

.lightbox-description {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 0.6rem;
  line-height: 1.4;
}

.lightbox-meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.2rem;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.7);
}

.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.meta-item i {
  color: var(--primary);
}

.lightbox-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.lightbox-tag-chip {
  padding: 0.2rem 0.6rem;
  background: rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.85);
}

.lb-like-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-pill);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lb-like-btn:hover {
  background: rgba(244, 63, 94, 0.25);
  border-color: #f43f5e;
}

.lb-like-btn.liked {
  background: #f43f5e;
  border-color: #f43f5e;
  color: #fff;
}

/* Lightbox Bottom Thumbnail Strip */
.lightbox-thumbs-container {
  padding: 0.5rem 1.75rem 1.2rem;
  background: rgba(0, 0, 0, 0.7);
  overflow-x: auto;
  scrollbar-width: thin;
  z-index: 10;
}

.lightbox-thumbs-strip {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  min-width: max-content;
  margin: 0 auto;
}

.thumb-item {
  width: 64px;
  height: 48px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  opacity: 0.5;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition-fast);
  background: #1e293b;
}

.thumb-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.thumb-item:hover {
  opacity: 0.85;
  transform: translateY(-2px);
}

.thumb-item.active {
  opacity: 1;
  border-color: var(--primary);
  box-shadow: 0 0 10px var(--primary-glow);
  transform: scale(1.08);
}

/* --- Keyboard Shortcuts Modal --- */
.shortcuts-modal {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), visibility var(--transition-fast);
}

.shortcuts-modal.active {
  opacity: 1;
  visibility: visible;
}

.shortcuts-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
}

.shortcuts-card {
  position: relative;
  z-index: 2;
  width: 90%;
  max-width: 460px;
  background: var(--bg-surface-solid);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-lg);
}

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

.shortcuts-title {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--primary);
}

.shortcuts-title h3 {
  color: var(--text-primary);
  font-size: 1.15rem;
}

.shortcuts-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.shortcut-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

kbd {
  display: inline-block;
  padding: 0.25rem 0.55rem;
  background: var(--bg-main);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  font-family: 'Space Grotesk', monospace;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-primary);
  box-shadow: 0 2px 0 var(--border-subtle);
}

/* --- Toast Notification --- */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 10001;
  background: var(--bg-surface-solid);
  color: var(--text-primary);
  border: 1px solid var(--border-focus);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: 0.9rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  transition: all var(--transition-base);
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* --- Footer Section --- */
.app-footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.footer-links span i {
  color: var(--primary);
}

/* --- Responsive Media Queries --- */
@media (max-width: 1024px) {
  .gallery-grid.view-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.25rem;
  }
  .gallery-grid.view-masonry {
    column-count: 2;
  }
  .lightbox-image-wrapper {
    max-width: 92vw;
    max-height: 60vh;
  }
  .lightbox-image {
    max-height: 60vh;
  }
  .lightbox-caption-area {
    max-width: 70%;
  }
}

@media (max-width: 768px) {
  .app-container {
    padding: 1rem 1rem 2rem;
  }
  .header-content {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  .header-actions {
    width: 100%;
    justify-content: space-between;
  }
  .search-and-tools {
    flex-direction: column;
    align-items: stretch;
  }
  .toolbar-dropdowns {
    justify-content: space-between;
  }
  .control-group {
    flex: 1 1 calc(50% - 0.5rem);
    justify-content: space-between;
  }
  .gallery-grid.view-grid {
    grid-template-columns: 1fr;
  }
  .gallery-grid.view-masonry {
    column-count: 1;
  }
  .lb-nav-btn {
    width: 42px;
    height: 42px;
    font-size: 1rem;
  }
  .lb-nav-btn.prev-btn { left: 0.5rem; }
  .lb-nav-btn.next-btn { right: 0.5rem; }
  .lightbox-header {
    padding: 0.75rem 1rem;
  }
  .lightbox-title {
    font-size: 1rem;
    max-width: 150px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .lightbox-footer {
    flex-direction: column;
    align-items: flex-start;
    padding: 0.75rem 1rem;
    gap: 0.75rem;
  }
  .lightbox-caption-area {
    max-width: 100%;
  }
  .lightbox-meta-row {
    gap: 0.6rem;
  }
  .lightbox-thumbs-container {
    padding: 0.4rem 1rem 0.8rem;
  }
  .thumb-item {
    width: 52px;
    height: 38px;
  }
  /* On touch devices, keep overlay elements accessible */
  .card-quick-actions {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Accessibility: Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}