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

html, body {
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  scroll-behavior: smooth;
  min-height: 100vh;
  transition: background-color var(--transition-speed), color var(--transition-speed);
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
}

a, button, input, select {
  font-family: inherit;
}

/* Accessibility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Header */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem 2rem;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-speed);
}

.brand-title {
  font-size: clamp(1.2rem, 5vw, 1.75rem);
  font-weight: 700;
  white-space: nowrap;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

/* Glassmorphism & Claymorphism specific header backdrops */
[data-theme="glassmorphism"] .app-header {
  background-color: rgba(18, 14, 36, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}
[data-theme="claymorphism"] .app-header {
  background-color: rgba(240, 230, 255, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(180, 160, 210, 0.4);
  box-shadow: 0 4px 14px rgba(180, 160, 210, 0.35);
}
[data-theme="glassmorphism"] .filter-popover,
[data-theme="claymorphism"] .filter-popover {
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

/* Neo-Brutalism specific borders */
[data-theme="neo-brutalism"] * {
  border-width: 3px;
}
[data-theme="neo-brutalism"] .art-card {
  border: 4px solid var(--color-border);
}

.theme-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.theme-selector {
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  font-size: 0.875rem;
  font-weight: 500;
  max-width: 160px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: all var(--transition-speed);
}

@media (max-width: 600px) {
  .app-header {
    padding: 0.75rem 1rem;
  }
  .theme-selector {
    max-width: 125px;
    padding: 0.35rem 0.5rem;
    font-size: 0.8rem;
  }
  main {
    padding: 1rem;
  }
}

/* Controls */
main {
  padding: 2rem;
  max-width: 1400px;
  margin: 0 auto;
}

.control-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  margin-bottom: 2rem;
}

.search-container {
  flex: 1;
  min-width: 250px;
}

#search-input {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-speed);
}
#search-input:focus {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

.filter-container {
  position: relative;
}

.btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-speed);
  font-weight: 500;
}
.btn:hover {
  background-color: var(--color-surface-hover);
  box-shadow: var(--shadow-md);
}

/* Filter Popover */
.filter-popover {
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 0;
  right: auto;
  width: min(320px, calc(100vw - 2rem));
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-lg);
  z-index: 90;
  transition: opacity 0.2s, transform 0.2s;
}

@media (min-width: 601px) {
  .filter-popover {
    left: auto;
    right: 0;
    width: 300px;
  }
}

.filter-popover[hidden] {
  display: none;
}

.filter-section {
  margin-bottom: 1.5rem;
}
.filter-section h3 {
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.checkbox-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.checkbox-group label, .filter-section label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.95rem;
}

.chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.chip-label input {
  display: none;
}
.chip {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border-subtle);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition-speed);
}
.chip-label input:checked + .chip {
  background-color: var(--color-accent);
  color: var(--color-accent-text);
  border-color: var(--color-accent);
}
.chip.static {
  cursor: default;
  background-color: var(--color-surface);
}

.btn-text {
  background: none;
  border: none;
  color: var(--color-accent);
  cursor: pointer;
  font-weight: 500;
}

/* Badges */
.active-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  width: 100%;
}
.badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-full);
  background-color: var(--color-accent);
  color: var(--color-accent-text);
  border: none;
  font-size: 0.85rem;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s;
}
.badge:hover {
  transform: scale(1.05);
}

/* Gallery Grid */
.gallery-grid {
  column-count: 1;
  column-gap: 1.5rem;
}
@media (min-width: 600px) { .gallery-grid { column-count: 2; } }
@media (min-width: 900px) { .gallery-grid { column-count: 3; } }
@media (min-width: 1200px) { .gallery-grid { column-count: 4; } }

.art-card {
  break-inside: avoid;
  margin-bottom: 1.5rem;
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-surface);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

@media (hover: hover) {
  .art-card:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-lg);
  }
  .art-card:hover .card-overlay {
    opacity: 1;
  }
}

.card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.8) 0%, rgba(0,0,0,0) 50%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 1.5rem;
  opacity: 0;
  transition: opacity var(--transition-speed);
  color: #fff;
  pointer-events: none;
}
.card-overlay h3 {
  font-size: 1.25rem;
  margin-top: 0.25rem;
}
.card-category {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #ddd;
}

/* Image wrapper + Shimmer Loading */
.art-card-image-wrapper {
  position: relative;
  width: 100%;
  min-height: 160px;
  background-color: var(--color-surface);
}

.art-card-image-wrapper img {
  display: block;
  width: 100%;
  height: auto;
  transition: transform var(--transition-speed);
}

.shimmer {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    var(--color-surface) 0%,
    var(--color-bg-secondary) 40%,
    var(--color-surface) 80%
  );
  background-size: 200% 100%;
  animation: shimmer 1.4s infinite linear;
  opacity: 1;
  transition: opacity 0.4s ease;
  z-index: 1;
  pointer-events: none;
}

.shimmer--done {
  opacity: 0;
}

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

/* Empty State */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--color-text-secondary);
}
.empty-emoji {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  display: inline-block;
  animation: floatEmoji 3s infinite ease-in-out;
}
@keyframes floatEmoji {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}
.empty-state h2 {
  margin-bottom: 0.5rem;
  color: var(--color-text-primary);
}
.empty-state button {
  margin-top: 1.5rem;
}

/* Error Fallbacks & Funny Messages */
.art-card-image-wrapper.has-error {
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg-secondary);
}

.card-error-fallback {
  text-align: center;
  padding: 1.5rem;
  color: var(--color-text-secondary);
}

.card-error-fallback .error-emoji {
  font-size: 2.5rem;
  display: block;
  margin-bottom: 0.5rem;
}

.card-error-fallback .error-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 0.25rem;
}

.card-error-fallback .error-subtext {
  font-size: 0.825rem;
}

.lightbox-error-fallback {
  text-align: center;
  padding: 2rem;
  color: #ffffff;
  max-width: 380px;
}

.lightbox-error-fallback .error-emoji {
  font-size: 3.5rem;
  display: block;
  margin-bottom: 1rem;
}

.lightbox-error-fallback h3 {
  font-size: 1.35rem;
  margin-bottom: 0.5rem;
  color: #ffffff;
}

.lightbox-error-fallback p {
  font-size: 0.95rem;
  color: #cccccc;
  margin-bottom: 1.5rem;
  line-height: 1.5;
}

.btn-retry {
  background-color: var(--color-accent);
  color: var(--color-accent-text);
  border: none;
  font-size: 0.9rem;
  padding: 0.6rem 1.25rem;
  margin: 0 auto;
}
.btn-retry:hover {
  transform: scale(1.05);
}

/* Lightbox Modal */
.lightbox-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.85);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-speed), visibility var(--transition-speed);
  padding: 2rem;
}
.lightbox-overlay[hidden] {
  display: none !important;
}
.lightbox-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

/* Glassmorphism lightbox */
[data-theme="glassmorphism"] .lightbox-overlay {
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.lightbox-container {
  display: flex;
  align-items: center;
  width: 100%;
  height: 100%;
  max-width: 1400px;
  gap: 1rem;
}

.lightbox-content {
  flex: 1;
  display: flex;
  position: relative;
  background-color: var(--color-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  height: 100%;
  max-height: 90vh;
  border: 1px solid var(--color-border);
}

.lightbox-image-container {
  flex: 2;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #000;
  overflow: auto;
}

.lightbox-image {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  transition: transform 0.3s ease;
}
.lightbox-image.zoomed {
  transform: scale(2);
  cursor: zoom-out;
}

.lightbox-controls {
  position: absolute;
  bottom: 1rem;
  right: 1rem;
  display: flex;
  gap: 0.5rem;
  z-index: 20;
}

.lightbox-controls .icon-btn {
  background: rgba(0, 0, 0, 0.65);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  width: 44px;
  height: 44px;
}
.lightbox-controls .icon-btn:hover,
.lightbox-content.info-active .info-btn {
  background: var(--color-accent);
  color: var(--color-accent-text);
  border-color: var(--color-accent);
}

.lightbox-sidebar {
  flex: 1;
  min-width: 300px;
  max-width: 400px;
  padding: 2rem;
  overflow-y: auto;
  border-left: 1px solid var(--color-border);
  background-color: var(--color-bg);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.drawer-handle {
  display: none;
  width: 40px;
  height: 5px;
  background-color: var(--color-text-muted);
  border-radius: 99px;
  margin: 0 auto 0.75rem auto;
  cursor: pointer;
  opacity: 0.5;
  transition: opacity 0.2s ease;
}
.drawer-handle:hover {
  opacity: 1;
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.sidebar-header h2 {
  font-size: 1.5rem;
  margin-bottom: 0;
}

.info-close-btn {
  background: var(--color-surface);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-sm);
}

.info-close-btn:hover {
  background: var(--color-accent);
  color: var(--color-accent-text);
  border-color: var(--color-accent);
}

@media (min-width: 901px) {
  .info-close-btn {
    display: none;
  }
}

@media (max-width: 900px) {
  .drawer-handle {
    display: block;
  }
}

.meta-row {
  display: flex;
  justify-content: space-between;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border-subtle);
}
.meta-label {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}
.meta-value {
  font-weight: 500;
}

.lightbox-desc-container, .lightbox-tags-container {
  margin-top: 1.5rem;
}
.lightbox-desc-container h3, .lightbox-tags-container h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
  color: var(--color-text-secondary);
}
.lightbox-desc-container p {
  line-height: 1.6;
  color: var(--color-text-primary);
}

/* Icon Buttons */
.icon-btn {
  background: var(--color-surface);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: var(--shadow-md);
}
.icon-btn:hover {
  background: var(--color-accent);
  color: var(--color-accent-text);
  transform: scale(1.08);
}
.icon-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}
.close-btn {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 1010;
}

/* Responsive Lightbox */
@media (max-width: 900px) {
  .lightbox-overlay {
    padding: 1rem;
  }
  .lightbox-container {
    gap: 0;
  }
  .lightbox-content {
    flex-direction: column;
    position: relative;
    max-height: 85vh;
  }
  .lightbox-image-container {
    flex: 1;
    width: 100%;
    height: 100%;
    min-height: 0;
  }
  
  .lightbox-sidebar {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    max-width: 100%;
    max-height: 60vh;
    border-left: none;
    border-top: 1px solid var(--color-border);
    box-shadow: 0 -8px 32px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    background-color: var(--color-surface);
    transform: translateY(100%);
    opacity: 0;
    pointer-events: none;
    z-index: 30;
    padding: 1.5rem;
    border-top-left-radius: var(--radius-lg);
    border-top-right-radius: var(--radius-lg);
  }

  .lightbox-content.info-active .lightbox-sidebar {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 10;
  }
  .prev { left: 0.5rem; }
  .next { right: 0.5rem; }
  .close-btn {
    top: 0.75rem;
    right: 0.75rem;
    width: 40px;
    height: 40px;
  }
}