/* ==========================================================================
   Prometheus Research Group — Geometric Library
   Dark theme. No grid backgrounds. Mobile-first. Production-grade.
   ========================================================================== */

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

:root {
  --bg: #0a0a0a;
  --bg-card: #141414;
  --bg-card-hover: #1c1c1c;
  --bg-surface: #111111;
  --border: #222222;
  --border-light: #333333;
  --text: #e8e8e8;
  --text-dim: #999999;
  --text-muted: #666666;
  --accent: #C41E3A;
  --accent-light: #E8384F;
  --accent-glow: rgba(196, 30, 58, 0.15);
  --blue: #2c5f7c;
  --blue-light: #3a7fa0;
  --gold: #c9a84c;
  --green: #3a8a5c;
  --purple: #7c5cbf;
  --font-sans: 'Helvetica Neue', -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Courier New', monospace;
  --radius: 6px;
  --radius-lg: 10px;
  --transition: 0.25s ease;
  --header-h: 56px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

a {
  color: var(--accent-light);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--accent);
}

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

/* --- Shared Layout --- */
.page-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* --- Site Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.25rem;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.site-header .org-link {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-light);
}

.site-header .org-link:hover {
  color: var(--text);
}

.site-header nav {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.site-header nav a {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-dim);
  letter-spacing: 0.04em;
}

.site-header nav a:hover,
.site-header nav a.active {
  color: var(--text);
}

/* --- Breadcrumb --- */
.breadcrumb {
  padding: 1rem 0 0.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  align-items: center;
}

.breadcrumb a {
  color: var(--text-dim);
}

.breadcrumb a:hover {
  color: var(--accent-light);
}

.breadcrumb .sep {
  color: var(--text-muted);
  user-select: none;
}

/* --- Page Hero --- */
.page-hero {
  text-align: center;
  padding: 3.5rem 1rem 2.5rem;
}

.page-hero h1 {
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 0.75rem;
  color: var(--text);
}

.page-hero .subtitle {
  font-size: 1.05rem;
  color: var(--text-dim);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.65;
}

.page-hero .stat-row {
  display: flex;
  justify-content: center;
  gap: 2.5rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.page-hero .stat {
  text-align: center;
}

.page-hero .stat-number {
  display: block;
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent-light);
  line-height: 1.1;
}

.page-hero .stat-label {
  display: block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

/* --- Navigation Mode Cards (Landing) --- */
.mode-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  padding: 1rem 0 3rem;
  max-width: 700px;
  margin: 0 auto;
}

.mode-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  transition: all var(--transition);
  cursor: pointer;
  text-decoration: none;
  color: var(--text);
}

.mode-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
  box-shadow: 0 0 20px var(--accent-glow);
  transform: translateY(-2px);
  color: var(--text);
}

.mode-card .card-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  line-height: 1;
}

.mode-card h2 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.mode-card p {
  font-size: 0.88rem;
  color: var(--text-dim);
  line-height: 1.55;
}

/* --- Dimension Cards --- */
.dim-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
  padding: 0.5rem 0 3rem;
}

.dim-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: all var(--transition);
  cursor: pointer;
  text-decoration: none;
  color: var(--text);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.dim-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--blue-light);
  transform: translateY(-2px);
  color: var(--text);
}

.dim-card .dim-label {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--blue-light);
  line-height: 1;
}

.dim-card .dim-name {
  font-size: 0.88rem;
  color: var(--text-dim);
  line-height: 1.4;
}

.dim-card .dim-count {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: auto;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
}

/* --- Family List (within a dimension) --- */
.family-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
  padding: 0 0 3rem;
}

.family-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  transition: all var(--transition);
  cursor: pointer;
  text-decoration: none;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 1rem;
}

.family-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
  color: var(--text);
}

.family-card .thumb {
  width: 56px;
  height: 56px;
  border-radius: var(--radius);
  background: var(--bg);
  border: 1px solid var(--border);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.family-card .thumb img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.family-card .thumb .placeholder-icon {
  font-size: 1.5rem;
  color: var(--text-muted);
}

.family-card .info {
  flex: 1;
  min-width: 0;
}

.family-card .info h3 {
  font-size: 0.92rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.family-card .info .meta {
  font-size: 0.75rem;
  color: var(--text-dim);
}

.family-card .entry-count {
  font-size: 0.7rem;
  color: var(--text-muted);
  background: var(--bg);
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  flex-shrink: 0;
}

/* --- Category Cards (Match Map) --- */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1.25rem;
  padding: 0.5rem 0 3rem;
}

.cat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  text-align: center;
  transition: all var(--transition);
  cursor: pointer;
  text-decoration: none;
  color: var(--text);
}

.cat-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--gold);
  transform: translateY(-2px);
  color: var(--text);
}

.cat-card.unknown:hover {
  border-color: var(--purple);
}

.cat-card .cat-icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
  line-height: 1;
}

.cat-card h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.cat-card .cat-count {
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* --- Category Detail List --- */
.category-header {
  text-align: center;
  padding: 2.5rem 1rem 1.5rem;
}

.category-header h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.category-header .desc {
  font-size: 0.95rem;
  color: var(--text-dim);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

.category-header .unknown-callout {
  background: rgba(124, 92, 191, 0.08);
  border: 1px solid rgba(124, 92, 191, 0.25);
  border-radius: var(--radius);
  padding: 1rem 1.5rem;
  margin-top: 1.25rem;
  font-size: 0.9rem;
  color: var(--purple);
  display: inline-block;
}

.topology-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
  padding: 0 0 3rem;
}

.topology-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  transition: all var(--transition);
  cursor: pointer;
  text-decoration: none;
  color: var(--text);
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.topology-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
  color: var(--text);
}

.topology-card .thumb {
  width: 48px;
  height: 48px;
  border-radius: 4px;
  background: var(--bg);
  border: 1px solid var(--border);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.topology-card .thumb img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.topology-card .info {
  flex: 1;
  min-width: 0;
}

.topology-card .info h3 {
  font-size: 0.92rem;
  font-weight: 600;
  margin-bottom: 0.15rem;
}

.topology-card .info .dim-badge {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
  background: var(--bg);
  color: var(--blue-light);
  border: 1px solid var(--border);
  margin-right: 0.35rem;
}

.topology-card .info .desc-text {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 0.35rem;
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ==========================================================================
   GALLERY — The main interactive shape viewer
   ========================================================================== */

.gallery-page {
  display: flex;
  flex-direction: column;
  height: calc(100vh - var(--header-h));
  overflow: hidden;
}

/* Top bar: breadcrumb + dimensional arrows */
.gallery-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.6rem 1.25rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.gallery-topbar .dim-arrows {
  display: flex;
  gap: 0.5rem;
}

.dim-arrow-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-dim);
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.dim-arrow-btn:hover:not(:disabled) {
  border-color: var(--blue-light);
  color: var(--text);
  background: var(--bg-card-hover);
}

.dim-arrow-btn:disabled {
  opacity: 0.3;
  cursor: default;
}

/* Image viewport */
.gallery-viewport {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background: var(--bg);
  min-height: 0;
  touch-action: pan-y;
  user-select: none;
  -webkit-user-select: none;
}

.gallery-viewport .shape-image {
  max-width: 90%;
  max-height: 90%;
  object-fit: contain;
  transition: opacity 0.15s ease;
  pointer-events: none;
}

.gallery-viewport .shape-image.loading {
  opacity: 0.3;
}

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

.gallery-viewport .no-image .placeholder-shape {
  font-size: 4rem;
  margin-bottom: 1rem;
  opacity: 0.3;
}

/* Swipe hint arrows (left/right edges) */
.swipe-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(20, 20, 20, 0.7);
  color: var(--text-dim);
  font-size: 1.2rem;
  border: none;
  cursor: pointer;
  z-index: 10;
  transition: all var(--transition);
  border-radius: 4px;
}

.swipe-arrow:hover {
  background: rgba(30, 30, 30, 0.9);
  color: var(--text);
}

.swipe-arrow.left {
  left: 0.5rem;
}

.swipe-arrow.right {
  right: 0.5rem;
}

.swipe-arrow:disabled {
  opacity: 0.15;
  cursor: default;
}

/* Bottom control panel */
.gallery-controls {
  flex-shrink: 0;
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  padding: 0.75rem 1.25rem 1rem;
}

/* Row 1: Shape navigation */
.ctrl-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 0.6rem;
}

.nav-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-dim);
  font-size: 0.8rem;
  padding: 0.35rem 0.75rem;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.nav-btn:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--text);
}

.nav-btn:disabled {
  opacity: 0.25;
  cursor: default;
}

.ctrl-nav .shape-title {
  text-align: center;
  min-width: 0;
  flex: 1;
  max-width: 400px;
}

.ctrl-nav .shape-title .name {
  font-size: 0.95rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ctrl-nav .shape-title .position {
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* Row 2: Image type tabs */
.ctrl-tabs {
  display: flex;
  justify-content: center;
  gap: 0.35rem;
  margin-bottom: 0.6rem;
  flex-wrap: wrap;
}

.tab-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-dim);
  font-size: 0.72rem;
  font-weight: 500;
  padding: 0.3rem 0.7rem;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.tab-btn:hover {
  border-color: var(--accent);
  color: var(--text);
}

.tab-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.tab-btn:disabled {
  opacity: 0.2;
  cursor: default;
}

.tab-btn:disabled:hover {
  border-color: var(--border);
  color: var(--text-dim);
}

/* Row 3: Distortion scrubber */
.ctrl-scrubber {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.scrubber-track {
  flex: 1;
  position: relative;
  height: 28px;
  display: flex;
  align-items: center;
}

.scrubber-track .track-line {
  width: 100%;
  height: 2px;
  background: var(--border-light);
  border-radius: 1px;
  position: relative;
}

.scrubber-track .track-fill {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  background: var(--accent);
  border-radius: 1px;
  transition: width 0.1s ease;
}

.scrubber-dots {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  transform: translateY(-50%);
  display: flex;
  justify-content: space-between;
  pointer-events: none;
}

.scrubber-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border-light);
  border: 2px solid var(--bg-surface);
  transition: all 0.15s ease;
  pointer-events: all;
  cursor: pointer;
  flex-shrink: 0;
}

.scrubber-dot.active {
  background: var(--accent-light);
  border-color: var(--accent);
  transform: scale(1.3);
}

.scrubber-dot.visited {
  background: var(--text-muted);
}

.scrubber-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  white-space: nowrap;
  min-width: 60px;
  text-align: right;
}

.scrubber-value {
  font-size: 0.7rem;
  color: var(--text-dim);
  white-space: nowrap;
  min-width: 60px;
}

/* Metadata row */
.ctrl-meta {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.meta-item {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.meta-item .meta-label {
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-right: 0.3rem;
}

.meta-item .meta-val {
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.7rem;
}

/* --- Footer --- */
.site-footer {
  text-align: center;
  padding: 2rem 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.72rem;
  color: var(--text-muted);
}

.site-footer a {
  color: var(--text-dim);
}

/* --- Section Headings --- */
.section-heading {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  padding: 1.5rem 0 0.75rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1rem;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .page-hero h1 {
    font-size: 1.8rem;
  }

  .page-hero .subtitle {
    font-size: 0.92rem;
  }

  .mode-cards {
    grid-template-columns: 1fr;
    max-width: 400px;
  }

  .dim-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  }

  .family-list {
    grid-template-columns: 1fr;
  }

  .topology-list {
    grid-template-columns: 1fr;
  }

  .gallery-controls {
    padding: 0.5rem 0.75rem 0.75rem;
  }

  .ctrl-nav .shape-title .name {
    font-size: 0.85rem;
  }

  .ctrl-meta {
    gap: 0.75rem;
  }

  .swipe-arrow {
    width: 36px;
    height: 60px;
    font-size: 1rem;
  }

  .site-header nav {
    gap: 0.75rem;
  }

  .site-header nav a {
    font-size: 0.75rem;
  }
}

@media (max-width: 480px) {
  .page-hero {
    padding: 2.5rem 0.5rem 2rem;
  }

  .page-hero h1 {
    font-size: 1.5rem;
  }

  .dim-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }

  .cat-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }

  .ctrl-tabs {
    gap: 0.25rem;
  }

  .tab-btn {
    font-size: 0.65rem;
    padding: 0.25rem 0.5rem;
  }

  .ctrl-meta {
    gap: 0.5rem;
  }

  .meta-item {
    font-size: 0.65rem;
  }
}

/* --- Loading/Empty States --- */
.loading-state {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
}

.empty-state h2 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  color: var(--text-dim);
}

/* --- Scrollbar styling (WebKit) --- */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}