@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=Syne:wght@400;500;600;700;800&display=swap');

:root {
  /* Neutral palette - warm undertones */
  --ink: oklch(15% 0.01 250);
  --ink-soft: oklch(25% 0.008 250);
  --ink-muted: oklch(45% 0.006 250);
  --surface: oklch(98.5% 0.003 90);
  --surface-elevated: oklch(100% 0 0);
  --surface-dim: oklch(95% 0.004 90);

  /* Accent - electric vermillion */
  --accent: oklch(65% 0.25 25);
  --accent-dim: oklch(55% 0.2 25);

  /* Functional */
  --success: oklch(50% 0.28 27);
  --border: oklch(88% 0.005 90);
  --border-subtle: oklch(92% 0.003 90);

  /* Spacing scale */
  --space-xs: clamp(0.25rem, 0.5vw, 0.5rem);
  --space-sm: clamp(0.5rem, 1vw, 0.75rem);
  --space-md: clamp(1rem, 2vw, 1.5rem);
  --space-lg: clamp(1.5rem, 3vw, 2.5rem);
  --space-xl: clamp(2rem, 5vw, 4rem);
  --space-2xl: clamp(3rem, 8vw, 6rem);

  /* Typography */
  --font-display: 'Syne', sans-serif;
  --font-body: 'Space Grotesk', sans-serif;

  /* Motion */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 500ms;
}

/* Dark theme - applied via class */
:root.dark-theme {
  --ink: oklch(95% 0.01 250);
  --ink-soft: oklch(85% 0.008 250);
  --ink-muted: oklch(60% 0.006 250);
  --surface: oklch(12% 0.008 270);
  --surface-elevated: oklch(18% 0.01 270);
  --surface-dim: oklch(8% 0.006 270);
  --border: oklch(22% 0.008 270);
  --border-subtle: oklch(18% 0.006 270);
}

/* Fallback: use system preference if no class is set */
@media (prefers-color-scheme: dark) {
  :root:not(.light-theme):not(.dark-theme) {
    --ink: oklch(95% 0.01 250);
    --ink-soft: oklch(85% 0.008 250);
    --ink-muted: oklch(60% 0.006 250);
    --surface: oklch(12% 0.008 270);
    --surface-elevated: oklch(18% 0.01 270);
    --surface-dim: oklch(8% 0.006 270);
    --border: oklch(22% 0.008 270);
    --border-subtle: oklch(18% 0.006 270);
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: clamp(15px, 1vw + 12px, 18px);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-body);
  background-color: var(--surface);
  color: var(--ink);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  transition:
    background-color var(--duration-normal) var(--ease-out-quart),
    color var(--duration-normal) var(--ease-out-quart);
}

/* ═══════════════════════════════════════════
   HEADER - Architectural, minimal
   ═══════════════════════════════════════════ */

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.header-content {
  max-width: 1600px;
  margin: 0 auto;
  padding: var(--space-lg) var(--space-xl);
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: var(--space-lg);
}

.header-title {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  text-transform: uppercase;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.header-title::before {
  content: '';
  display: block;
  width: 0.6em;
  height: 0.6em;
  background: var(--accent);
  border-radius: 2px;
  transform: rotate(45deg);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.theme-toggle {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  background: var(--surface-dim);
  border: 1px solid var(--border);
  color: var(--ink);
  cursor: pointer;
  transition:
    background var(--duration-fast) var(--ease-out-quart),
    border-color var(--duration-fast) var(--ease-out-quart),
    color var(--duration-fast) var(--ease-out-quart);
}

.theme-toggle:hover {
  background: var(--surface-elevated);
  border-color: var(--ink-muted);
}

.theme-icon {
  transition: opacity var(--duration-fast) var(--ease-out-quart);
}

.theme-icon--dark {
  position: absolute;
  opacity: 0;
}

:root.dark-theme .theme-icon--light,
:root:not(.light-theme):not(.dark-theme) .theme-icon--light {
  opacity: 1;
}

:root.dark-theme .theme-icon--dark,
:root:not(.light-theme):not(.dark-theme) .theme-icon--dark {
  opacity: 0;
}

:root.light-theme .theme-icon--light {
  opacity: 0;
}

:root.light-theme .theme-icon--dark {
  opacity: 1;
}

@media (prefers-color-scheme: dark) {
  :root:not(.light-theme):not(.dark-theme) .theme-icon--light {
    opacity: 0;
  }
  :root:not(.light-theme):not(.dark-theme) .theme-icon--dark {
    opacity: 1;
  }
}

.search-container {
  position: relative;
  width: clamp(200px, 30vw, 400px);
}

.search-input {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  padding-left: calc(var(--space-md) + 1.5rem);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 400;
  letter-spacing: 0.01em;
  color: var(--ink);
  background: var(--surface-dim);
  border: 1px solid transparent;
  border-radius: 0;
  transition:
    border-color var(--duration-fast) var(--ease-out-quart),
    background var(--duration-fast) var(--ease-out-quart);
}

.search-container::before {
  content: '';
  position: absolute;
  left: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  width: 1rem;
  height: 1rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%23666'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M21 21l-5.197-5.197m0 0A7.5 7.5 0 105.196 5.196a7.5 7.5 0 0010.607 10.607z'/%3E%3C/svg%3E");
  background-size: contain;
  opacity: 0.5;
  pointer-events: none;
}

.search-input:focus {
  outline: none;
  border-color: var(--ink);
  background: var(--surface-elevated);
}

.search-input::placeholder {
  color: var(--ink-muted);
  font-weight: 400;
}

/* ═══════════════════════════════════════════
   FILTERS - Pill navigation
   ═══════════════════════════════════════════ */

.filters {
  position: sticky;
  top: calc(var(--space-lg) * 2 + 3rem);
  z-index: 99;
  background: var(--surface);
  padding: var(--space-md) var(--space-xl);
  border-bottom: 1px solid var(--border-subtle);
}

.filters-content {
  max-width: 1600px;
  margin: 0 auto;
  display: flex;
  gap: var(--space-xs);
  flex-wrap: wrap;
  align-items: center;
}

/* Filter Buttons */
.filter-buttons {
  display: flex;
  gap: var(--space-xs);
  flex-wrap: wrap;
}

.filter-btn {
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-soft);
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  cursor: pointer;
  transition:
    background var(--duration-fast) var(--ease-out-quart),
    border-color var(--duration-fast) var(--ease-out-quart),
    color var(--duration-fast) var(--ease-out-quart),
    transform var(--duration-fast) var(--ease-out-expo);
}

.filter-btn:hover {
  border-color: var(--ink-muted);
  color: var(--ink);
  transform: translateY(-1px);
}

.filter-btn.active {
  background: var(--success);
  border-color: var(--success);
  color: var(--surface);
}

/* Filter Dropdown */
.filter-dropdown {
  position: relative;
}

.filter-btn .dropdown-arrow {
  margin-left: var(--space-xs);
  transition: transform var(--duration-fast) var(--ease-out-quart);
}

.filter-dropdown.open .dropdown-arrow {
  transform: rotate(180deg);
}

.filter-submenu {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  min-width: 200px;
  max-height: 300px;
  overflow-y: auto;
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  box-shadow: 0 8px 24px oklch(0% 0 0 / 0.15);
  z-index: 200;
  display: none;
  animation: submenuReveal var(--duration-fast) var(--ease-out-expo);
}

.filter-dropdown.open .filter-submenu {
  display: block;
}

@keyframes submenuReveal {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.filter-submenu::-webkit-scrollbar {
  width: 6px;
}

.filter-submenu::-webkit-scrollbar-track {
  background: var(--surface-dim);
}

.filter-submenu::-webkit-scrollbar-thumb {
  background: var(--border);
}

.submenu-item {
  display: block;
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 500;
  text-align: left;
  color: var(--ink-soft);
  background: transparent;
  border: none;
  cursor: pointer;
  transition:
    background var(--duration-fast) var(--ease-out-quart),
    color var(--duration-fast) var(--ease-out-quart);
}

.submenu-item:hover {
  background: var(--surface-dim);
  color: var(--ink);
}

.submenu-item.active {
  background: var(--success);
  color: var(--surface);
}

/* ═══════════════════════════════════════════
   MAIN CONTENT
   ═══════════════════════════════════════════ */

.main-content {
  max-width: 1600px;
  margin: 0 auto;
  padding: var(--space-xl);
  padding-top: var(--space-lg);
}

.stats {
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--ink-muted);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--border-subtle);
}

/* ═══════════════════════════════════════════
   GALLERY - Museum grid
   ═══════════════════════════════════════════ */

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr));
  gap: var(--space-md);
}

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

.card {
  --card-index: 0;
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  position: relative;
  animation: cardReveal var(--duration-slow) var(--ease-out-expo) backwards;
  animation-delay: calc(var(--card-index) * 30ms);
  transition:
    border-color var(--duration-normal) var(--ease-out-quart),
    transform var(--duration-normal) var(--ease-out-expo);
}

.card:hover {
  border-color: var(--ink-muted);
  transform: translateY(-2px);
}

.card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--duration-normal) var(--ease-out-expo);
}

.card:hover::after {
  width: 100%;
}

.card-image-container {
  position: relative;
  aspect-ratio: 1;
  background:
    linear-gradient(135deg, var(--surface-dim) 25%, transparent 25%),
    linear-gradient(225deg, var(--surface-dim) 25%, transparent 25%),
    linear-gradient(45deg, var(--surface-dim) 25%, transparent 25%),
    linear-gradient(315deg, var(--surface-dim) 25%, var(--surface-elevated) 25%);
  background-size: 20px 20px;
  background-position: 0 0, 10px 0, 10px -10px, 0 10px;
  cursor: pointer;
  overflow: hidden;
}

.card-image {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: var(--space-lg);
  transition: transform var(--duration-slow) var(--ease-out-expo);
  filter: drop-shadow(0 4px 12px oklch(0% 0 0 / 0.08));
}

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

.card-info {
  padding: var(--space-md);
  display: grid;
  gap: var(--space-xs);
}

.card-name {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.4;
}

.card-category {
  font-size: 0.65rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-muted);
}

.card-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  margin-top: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-body);
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--surface);
  background: var(--success);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition:
    background var(--duration-fast) var(--ease-out-quart),
    transform var(--duration-fast) var(--ease-out-expo);
}

.card-download:hover {
  background: oklch(45% 0.28 27);
  transform: translateY(-1px);
}

.card-download:disabled {
  background: var(--border);
  color: var(--ink-muted);
  cursor: not-allowed;
  transform: none;
}

.card-download svg {
  width: 12px;
  height: 12px;
}

.card-downloads {
  display: flex;
  gap: var(--space-xs);
  margin-top: var(--space-xs);
}

.card-downloads .card-download {
  flex: 1;
  margin-top: 0;
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.6rem;
}

.card-download--png {
  background: var(--ink);
}

.card-download--png:hover {
  background: var(--ink-soft);
}

.card-download--tiff {
  background: var(--success);
}

.card-download--tiff:hover {
  background: oklch(45% 0.28 27);
}

/* ═══════════════════════════════════════════
   LOADING & EMPTY STATES
   ═══════════════════════════════════════════ */

.loading,
.no-results {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
  color: var(--ink-muted);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
}

.loading::before {
  content: '';
  display: block;
  width: 24px;
  height: 24px;
  margin: 0 auto var(--space-md);
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ═══════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════ */

@media (max-width: 768px) {
  .header-content {
    grid-template-columns: 1fr;
    gap: var(--space-md);
    padding: var(--space-md);
  }

  .header-title {
    justify-content: center;
  }

  .header-actions {
    width: 100%;
    justify-content: center;
  }

  .search-container {
    flex: 1;
    width: auto;
  }

  .filters {
    padding: var(--space-sm) var(--space-md);
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }

  .filters::-webkit-scrollbar {
    display: none;
  }

  .filters-content {
    flex-wrap: nowrap;
    padding-bottom: var(--space-xs);
  }

  .filters-content::before {
    display: none;
  }

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

  .gallery {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
  }

  .card-image {
    padding: var(--space-md);
  }

  .card-info {
    padding: var(--space-sm);
  }
}

@media (min-width: 1200px) {
  .gallery {
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  }
}

/* ═══════════════════════════════════════════
   FOCUS STYLES
   ═══════════════════════════════════════════ */

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

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

/* ═══════════════════════════════════════════
   SELECTION
   ═══════════════════════════════════════════ */

::selection {
  background: var(--accent);
  color: oklch(100% 0 0);
}