/* ==========================================================================
   VIRTUAL PHOTOGRAPHY GALLERY - LIGHT METALLIC THEME (MOBILE-FIRST)
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. DESIGN TOKENS & CSS VARIABLES
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette - Polished Chrome & Light Titanium */
  --bg-primary: #f2f4f8;
  --bg-secondary: #e9edf4;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-sidebar: #f8fafd;
  --bg-glass: rgba(248, 250, 253, 0.88);
  --bg-glass-card: rgba(255, 255, 255, 0.75);
  --bg-modal: rgba(242, 245, 250, 0.96);

  /* Metallic Gradients */
  --metallic-sheen: linear-gradient(135deg, #ffffff 0%, #e2e8f2 50%, #f7f9fd 100%);
  --metallic-surface: linear-gradient(145deg, #ffffff 0%, #f4f6fa 60%, #eaeff7 100%);
  --metallic-dark: linear-gradient(135deg, #20242c 0%, #111419 100%);
  --metallic-chrome: linear-gradient(135deg, #f0f4f9 0%, #dce4f0 45%, #ffffff 70%, #d2dbe8 100%);
  --metallic-badge: linear-gradient(135deg, #eef2f7 0%, #e0e7f1 100%);

  /* Borders & Highlights */
  --border-subtle: rgba(18, 24, 38, 0.08);
  --border-medium: rgba(18, 24, 38, 0.15);
  --border-strong: rgba(18, 24, 38, 0.28);
  --border-focus: #111419;
  --border-chrome: rgba(255, 255, 255, 0.9);

  /* Typography Colors */
  --text-primary: #0f131a;
  --text-secondary: #4a5263;
  --text-muted: #7e889b;
  --text-inverse: #ffffff;

  /* Shadows - Specular Metallic Ambient */
  --shadow-sm: 0 2px 6px rgba(16, 24, 40, 0.04), 0 1px 2px rgba(16, 24, 40, 0.03);
  --shadow-metallic: 0 4px 16px -2px rgba(18, 28, 48, 0.06), 0 2px 6px -1px rgba(18, 28, 48, 0.04), inset 0 1px 0 rgba(255, 255, 255, 0.95);
  --shadow-metallic-hover: 0 20px 35px -8px rgba(18, 28, 48, 0.14), 0 8px 16px -4px rgba(18, 28, 48, 0.06), inset 0 1px 1px rgba(255, 255, 255, 1);
  --shadow-modal: 0 30px 70px -15px rgba(15, 23, 42, 0.25);

  /* Typography */
  --font-display: 'Bebas Neue', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Sizing & Radius */
  --sidebar-width: 310px;
  --header-height: 64px;
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Dark Mode Override (Liquid Obsidian & Dark Titanium) */
[data-theme="dark"] {
  --bg-primary: #0b0d13;
  --bg-secondary: #121620;
  --bg-surface: #141822;
  --bg-surface-elevated: #1a202e;
  --bg-sidebar: #0f1219;
  --bg-glass: rgba(15, 18, 25, 0.88);
  --bg-glass-card: rgba(20, 24, 34, 0.75);
  --bg-modal: rgba(10, 13, 19, 0.96);

  --metallic-sheen: linear-gradient(135deg, #2a3142 0%, #151922 50%, #2f374a 100%);
  --metallic-surface: linear-gradient(145deg, #181d28 0%, #12151f 60%, #0d1017 100%);
  --metallic-dark: linear-gradient(135deg, #ffffff 0%, #e2e8f2 100%);
  --metallic-chrome: linear-gradient(135deg, #2b3345 0%, #191e2a 50%, #343e54 100%);
  --metallic-badge: linear-gradient(135deg, #191d28 0%, #131620 100%);

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.16);
  --border-strong: rgba(255, 255, 255, 0.32);
  --border-focus: #ffffff;
  --border-chrome: rgba(255, 255, 255, 0.18);

  --text-primary: #f2f5fa;
  --text-secondary: #9da8ba;
  --text-muted: #626c7e;
  --text-inverse: #0b0d13;

  --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-metallic: 0 4px 16px -2px rgba(0, 0, 0, 0.45), 0 2px 6px -1px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  --shadow-metallic-hover: 0 20px 35px -8px rgba(0, 0, 0, 0.7), 0 8px 16px -4px rgba(0, 0, 0, 0.4), inset 0 1px 1px rgba(255, 255, 255, 0.16);
  --shadow-modal: 0 30px 70px -15px rgba(0, 0, 0, 0.75);
}

/* --------------------------------------------------------------------------
   2. RESET & BASE (MOBILE-FIRST)
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 15px;
  scroll-behavior: smooth;
  color-scheme: light;
  background-color: var(--bg-primary);
}

body {
  background-color: var(--bg-primary);
  background-image: 
    radial-gradient(at 100% 0%, rgba(226, 235, 247, 0.6) 0px, transparent 50%),
    radial-gradient(at 0% 100%, rgba(235, 240, 249, 0.7) 0px, transparent 50%);
  background-attachment: fixed;
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  overflow-x: hidden;
}

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

button, input {
  font-family: inherit;
  color: inherit;
  background: none;
  border: none;
  outline: none;
}

button {
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

a {
  color: inherit;
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   3. MOBILE LAYOUT & STRUCTURE
   -------------------------------------------------------------------------- */
.app-layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.main-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  width: 100%;
}

/* --------------------------------------------------------------------------
   4. SIDEBAR DRAWER (MOBILE BASE)
   -------------------------------------------------------------------------- */
.sidebar {
  position: fixed;
  top: 0;
  bottom: 0;
  left: -100%;
  width: min(85vw, 340px);
  height: 100vh;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-medium);
  display: flex;
  flex-direction: column;
  padding: 2.25rem 1.6rem 1.75rem;
  z-index: 200;
  overflow-y: auto;
  box-shadow: 10px 0 40px rgba(18, 28, 48, 0.15);
  transition: transform var(--transition-smooth), left var(--transition-smooth);
  scrollbar-width: thin;
  scrollbar-color: var(--border-subtle) transparent;
}

.sidebar.open {
  left: 0;
}

.sidebar::-webkit-scrollbar {
  width: 4px;
}
.sidebar::-webkit-scrollbar-thumb {
  background: var(--border-subtle);
  border-radius: 4px;
}

.sidebar-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 150;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.sidebar-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.sidebar-header {
  margin-bottom: 1.75rem;
}

.profile-name {
  font-family: var(--font-display);
  font-size: 2.4rem;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  line-height: 1;
  text-transform: uppercase;
  background: linear-gradient(135deg, #0b0d13 0%, #3a4253 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.profile-role {
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-top: 0.2rem;
}

.profile-bio {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-top: 1rem;
  line-height: 1.6;
}

/* Stats Cards with Metallic Depth */
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: var(--metallic-surface);
  border: 1px solid var(--border-subtle);
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-metallic);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--border-chrome);
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-metallic-hover);
}

.stat-value {
  font-family: var(--font-display);
  font-size: 1.65rem;
  letter-spacing: 0.03em;
  line-height: 1.1;
  color: var(--text-primary);
}

.stat-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

.sidebar-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-medium), transparent);
  margin: 1.5rem 0;
}

/* Category Navigation (Bebas Neue) */
.nav-section-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.category-nav {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.category-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.65rem 0.95rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-align: left;
  background: transparent;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.category-btn span:first-child {
  font-family: var(--font-display);
  font-size: 1.18rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  line-height: 1;
}

.category-btn:hover {
  background: var(--metallic-badge);
  color: var(--text-primary);
  border-color: var(--border-subtle);
  transform: translateX(3px);
}

.category-btn.active {
  background: var(--metallic-dark);
  color: var(--text-inverse);
  box-shadow: 0 4px 12px rgba(18, 24, 38, 0.2);
  border-color: transparent;
  font-weight: 500;
}

.category-count {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  background: rgba(18, 24, 38, 0.05);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.category-btn.active .category-count {
  color: rgba(255, 255, 255, 0.85);
  background: rgba(255, 255, 255, 0.18);
}

/* Social Links */
.social-links {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-top: auto;
  padding-top: 1.75rem;
}

.social-icon-btn {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--metallic-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  box-shadow: var(--shadow-metallic);
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.social-icon-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--border-chrome);
}

.social-icon-btn:hover {
  background: var(--metallic-chrome);
  color: var(--text-primary);
  border-color: var(--border-medium);
  transform: translateY(-2px);
  box-shadow: var(--shadow-metallic-hover);
}

.social-icon-btn svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

/* --------------------------------------------------------------------------
   5. TOP TOOLBAR & HEADER (MOBILE-FIRST)
   -------------------------------------------------------------------------- */
.top-toolbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  box-shadow: 0 2px 10px rgba(18, 28, 48, 0.03);
}

.mobile-menu-toggle {
  width: 42px;
  height: 42px;
  min-width: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--metallic-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  box-shadow: var(--shadow-metallic);
  transition: all var(--transition-fast);
}

.mobile-menu-toggle:hover {
  background: var(--metallic-chrome);
  border-color: var(--border-medium);
}

.mobile-menu-toggle:active {
  transform: scale(0.95);
}

.search-box {
  position: relative;
  flex: 1;
  max-width: 100%;
}

.search-icon {
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  width: 16px;
  height: 16px;
  transition: color var(--transition-fast);
}

.search-input {
  width: 100%;
  height: 42px;
  padding: 0 1rem 0 2.4rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  color: var(--text-primary);
  box-shadow: inset 0 1px 2px rgba(18, 24, 38, 0.03);
  transition: all var(--transition-fast);
}

.search-input::placeholder {
  color: var(--text-muted);
}

.search-input:focus {
  border-color: var(--border-focus);
  background-color: var(--bg-surface);
  box-shadow: 0 0 0 3px rgba(18, 24, 38, 0.06), inset 0 1px 2px rgba(18, 24, 38, 0.03);
}

.search-input:focus + .search-icon {
  color: var(--text-primary);
}

/* Toolbar Controls (Sort & Column switches) */
.toolbar-controls {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.sort-wrapper {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.sort-select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  height: 38px;
  padding: 0 1.9rem 0 0.85rem;
  background: var(--metallic-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  box-shadow: var(--shadow-metallic);
  transition: all var(--transition-fast);
}

.sort-select:hover {
  background: var(--metallic-chrome);
  border-color: var(--border-medium);
  box-shadow: var(--shadow-metallic-hover);
}

.sort-select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(18, 24, 38, 0.08);
}

.sort-select option {
  background: #ffffff;
  color: #0f131a;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  text-transform: none;
  padding: 0.5rem;
}

.sort-arrow {
  position: absolute;
  right: 0.65rem;
  pointer-events: none;
  color: var(--text-muted);
  transition: transform var(--transition-fast), color var(--transition-fast);
}

.sort-wrapper:hover .sort-arrow {
  color: var(--text-primary);
}

/* Theme Toggle Button (Dark / Light) */
.theme-toggle-btn {
  width: 38px;
  height: 38px;
  min-width: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--metallic-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  box-shadow: var(--shadow-metallic);
  transition: all var(--transition-fast);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.theme-toggle-btn:hover {
  background: var(--metallic-chrome);
  border-color: var(--border-medium);
  box-shadow: var(--shadow-metallic-hover);
  transform: translateY(-1px);
}

.theme-toggle-btn:active {
  transform: translateY(0) scale(0.95);
}

.theme-icon {
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.2s ease;
}

/* Light mode: Show moon icon (clicking switches to dark) */
.theme-toggle-btn .sun-icon {
  display: none;
}

.theme-toggle-btn .moon-icon {
  display: block;
}

/* Dark mode overrides */
[data-theme="dark"] body {
  background-color: var(--bg-primary);
  background-image: 
    radial-gradient(at 100% 0%, rgba(30, 42, 64, 0.4) 0px, transparent 50%),
    radial-gradient(at 0% 100%, rgba(20, 28, 44, 0.5) 0px, transparent 50%);
}

[data-theme="dark"] .profile-name {
  background: linear-gradient(135deg, #ffffff 0%, #a4b0c2 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

[data-theme="dark"] .sort-select option {
  background: #141822;
  color: #f2f5fa;
}

[data-theme="dark"] .theme-toggle-btn .sun-icon {
  display: block;
}

[data-theme="dark"] .theme-toggle-btn .moon-icon {
  display: none;
}

[data-theme="dark"] .lightbox-image {
  background: #0f1219;
}

.column-switch {
  display: none;
  align-items: center;
  background: var(--metallic-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 2px;
  box-shadow: var(--shadow-metallic);
}

.col-btn {
  padding: 0.35rem 0.65rem;
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  border-radius: var(--radius-xs);
  transition: all var(--transition-fast);
  text-transform: uppercase;
}

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

.col-btn.active {
  background: var(--metallic-dark);
  color: var(--text-inverse);
  box-shadow: 0 2px 6px rgba(18, 24, 38, 0.15);
}

/* --------------------------------------------------------------------------
   6. CONTENT AREA & GALLERY HEADER
   -------------------------------------------------------------------------- */
.content-container {
  padding: 1.25rem 1rem 3rem;
  flex: 1;
}

.gallery-info-bar {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-subtle);
}

.gallery-title {
  font-family: var(--font-display);
  font-size: 2rem;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  line-height: 1;
  text-transform: uppercase;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.current-filter-name {
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.95rem;
  text-transform: none;
  letter-spacing: 0;
}

.items-count-badge {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  background: var(--metallic-badge);
  border: 1px solid var(--border-subtle);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-full);
}

/* --------------------------------------------------------------------------
   7. MASONRY GALLERY & CARDS (MOBILE-FIRST)
   -------------------------------------------------------------------------- */
.gallery-grid {
  column-count: 1;
  column-gap: 1.25rem;
  width: 100%;
}

.gallery-grid.cols-2 {
  column-count: 2;
}

.gallery-grid.cols-3 {
  column-count: 3;
}

.gallery-grid.cols-4 {
  column-count: 4;
}

/* Gallery Card - Polished Light Metallic Frame */
.gallery-card {
  position: relative;
  break-inside: avoid;
  margin-bottom: 1.25rem;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--metallic-surface);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-metallic);
  cursor: pointer;
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-fast);
  transform: translateZ(0);
  animation: cardReveal 0.5s cubic-bezier(0.16, 1, 0.3, 1) backwards;
}

@keyframes cardReveal {
  from {
    opacity: 0;
    transform: translateY(18px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.gallery-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--border-chrome);
  z-index: 2;
  pointer-events: none;
}

.gallery-card:hover {
  border-color: var(--border-medium);
  box-shadow: var(--shadow-metallic-hover);
  transform: translateY(-5px);
}

.card-image-wrapper {
  position: relative;
  width: 100%;
  background: #e2e8f2;
  overflow: hidden;
}

/* Metallic Sheen Effect on Hover */
.card-image-wrapper::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    60deg,
    transparent 40%,
    rgba(255, 255, 255, 0.28) 50%,
    transparent 60%
  );
  transform: rotate(-30deg) translateX(-100%);
  transition: transform 0.75s ease;
  pointer-events: none;
  z-index: 3;
}

.gallery-card:hover .card-image-wrapper::after {
  transform: rotate(-30deg) translateX(100%);
}

.card-img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1), filter 0.4s ease;
  background-color: #e5ebf5;
}

.gallery-card:hover .card-img {
  transform: scale(1.04);
}

/* Hover Overlay - Clean & Title/Tag-Free as Requested */
.card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(15, 20, 30, 0.88) 0%,
    rgba(15, 20, 30, 0.25) 45%,
    transparent 100%
  );
  opacity: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 1.15rem;
  transition: opacity var(--transition-normal);
  z-index: 4;
}

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

.card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  width: 100%;
}

.card-game {
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #ffffff;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-expand-icon {
  width: 32px;
  height: 32px;
  min-width: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 50%;
  color: #ffffff;
  transition: transform var(--transition-fast), background var(--transition-fast);
}

.gallery-card:hover .card-expand-icon {
  transform: scale(1.1);
  background: rgba(255, 255, 255, 0.4);
}

/* Empty State */
.no-results {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--text-muted);
  width: 100%;
}

.no-results-icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
  opacity: 0.7;
}

.no-results-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  letter-spacing: 0.04em;
  color: var(--text-primary);
  margin-bottom: 0.3rem;
  text-transform: uppercase;
}

/* --------------------------------------------------------------------------
   8. LIGHTBOX MODAL (CLEAN LIGHT METALLIC VIEWER)
   -------------------------------------------------------------------------- */
.lightbox-modal {
  position: fixed;
  inset: 0;
  background-color: var(--bg-modal);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
  padding: 1rem;
}

.lightbox-modal.active {
  opacity: 1;
  pointer-events: auto;
}

.lightbox-actions-bar {
  position: fixed;
  top: 1.25rem;
  right: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  z-index: 1010;
}

.lightbox-download-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  height: 44px;
  padding: 0 1.1rem 0 0.95rem;
  border-radius: var(--radius-full);
  background: var(--metallic-surface);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-medium);
  box-shadow: var(--shadow-metallic);
  color: var(--text-primary);
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.lightbox-download-btn:hover {
  background: var(--metallic-chrome);
  border-color: var(--border-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-metallic-hover);
}

.lightbox-download-btn:active {
  transform: translateY(0) scale(0.97);
}

.lightbox-download-btn.loading {
  opacity: 0.7;
  pointer-events: none;
}

.lightbox-close-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--metallic-surface);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-medium);
  box-shadow: var(--shadow-metallic);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.lightbox-close-btn:hover {
  background: var(--metallic-chrome);
  transform: rotate(90deg) scale(1.05);
  box-shadow: var(--shadow-metallic-hover);
}

.lightbox-media-container {
  display: flex;
  align-items: center;
  justify-content: center;
  max-width: 92vw;
  max-height: 90vh;
  position: relative;
  user-select: none;
}

.lightbox-image {
  max-width: 92vw;
  max-height: 86vh;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-modal);
  border: 1px solid var(--border-subtle);
  background: #ffffff;
  transition: transform var(--transition-smooth);
}

.lightbox-nav-btn {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--metallic-surface);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-medium);
  box-shadow: var(--shadow-metallic);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  z-index: 1010;
}

.lightbox-nav-btn:hover {
  background: var(--metallic-chrome);
  border-color: var(--border-strong);
  transform: translateY(-50%) scale(1.1);
  box-shadow: var(--shadow-metallic-hover);
}

.lightbox-nav-btn:active {
  transform: translateY(-50%) scale(0.95);
}

.lightbox-prev {
  left: 1rem;
}

.lightbox-next {
  right: 1rem;
}

/* --------------------------------------------------------------------------
   9. RESPONSIVE BREAKPOINTS (TABLET & DESKTOP)
   -------------------------------------------------------------------------- */

/* Tablet (>= 680px) */
@media (min-width: 680px) {
  .gallery-grid {
    column-count: 2;
    column-gap: 1.5rem;
  }

  .content-container {
    padding: 1.75rem 1.75rem 3.5rem;
  }

  .toolbar-controls {
    display: flex;
    gap: 0.75rem;
  }

  .column-switch {
    display: flex;
  }

  .search-box {
    max-width: 320px;
  }

  .top-toolbar {
    padding: 0.85rem 1.75rem;
  }

  .lightbox-prev {
    left: 2rem;
  }

  .lightbox-next {
    right: 2rem;
  }
}

/* Desktop (>= 1024px) */
@media (min-width: 1024px) {
  .app-layout {
    flex-direction: row;
  }

  .sidebar {
    position: sticky;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    box-shadow: none;
    border-right: 1px solid var(--border-subtle);
    padding: 2.5rem 1.75rem 2rem;
    flex-shrink: 0;
  }

  .mobile-menu-toggle {
    display: none;
  }

  .sidebar-backdrop {
    display: none !important;
  }

  .top-toolbar {
    padding: 1rem 2.5rem;
  }

  .content-container {
    padding: 2.25rem 2.5rem 4rem;
  }

  .gallery-grid {
    column-count: 3;
    column-gap: 1.75rem;
  }

  .search-box {
    max-width: 380px;
  }
}

/* Extra Large Desktop (>= 1440px) */
@media (min-width: 1440px) {
  .gallery-grid.cols-4 {
    column-count: 4;
  }
}