/* Layout Gallery - PSD3
 * Illuminated Manuscript aesthetic
 * Inspired by medieval codices - Visual Complexity homage
 */

/* ==========================================================================
   Illuminated Manuscript Color Palette
   ========================================================================== */

:root {
  /* Vellum/Parchment background tones */
  --vellum: #f5f0e1;
  --vellum-dark: #e8e0cc;
  --vellum-shadow: #d4c9b0;

  /* Manuscript ink and pigments */
  --ink-black: #1a1612;
  --ink-brown: #3d2b1f;
  --ink-sepia: #5c4033;

  /* Illumination colors - rich medieval pigments */
  --vermillion: #c23b22;        /* Red lead / cinnabar */
  --ultramarine: #1e3a5f;       /* Lapis lazuli */
  --gold-leaf: #c9a227;         /* Gold illumination */
  --gold-bright: #d4af37;
  --forest-green: #2d5a27;      /* Verdigris */
  --tyrian-purple: #66023c;     /* Murex purple */
  --ochre: #cc7722;             /* Yellow ochre */
  --malachite: #0d6e6e;         /* Copper green */

  /* Layout accent assignments */
  --color-tree: var(--forest-green);
  --color-cluster: var(--malachite);
  --color-pack: var(--vermillion);
  --color-partition: var(--gold-leaf);
  --color-treemap: var(--tyrian-purple);
  --color-chord: var(--ochre);
  --color-sankey: var(--ultramarine);
  --color-edge: var(--malachite);
  --color-adjacency: var(--ink-sepia);

  /* Typography */
  --font-display: 'Palatino Linotype', 'Book Antiqua', Palatino, Georgia, serif;
  --font-body: Georgia, 'Times New Roman', serif;

  /* Circle dimensions */
  --circle-size: 400px;
  --circle-gap: 32px;
  --row-offset: 216px;  /* Half circle + gap for offset */
}

/* ==========================================================================
   Base Styles
   ========================================================================== */

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

body {
  font-family: var(--font-body);
  background: var(--vellum);
  color: var(--ink-black);
  min-height: 100vh;
  /* Subtle parchment texture via gradient */
  background-image:
    radial-gradient(ellipse at 20% 30%, rgba(212, 201, 176, 0.3) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 70%, rgba(212, 201, 176, 0.25) 0%, transparent 50%),
    linear-gradient(180deg, var(--vellum) 0%, var(--vellum-dark) 100%);
}

/* ==========================================================================
   Gallery Container
   ========================================================================== */

.gallery-container {
  max-width: 1800px;
  margin: 0 auto;
  padding: 60px 40px 80px;
}

/* ==========================================================================
   Header - Manuscript Title Style
   ========================================================================== */

.gallery-header {
  text-align: center;
  margin-bottom: 60px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--vellum-shadow);
  position: relative;
}

/* Decorative flourish */
.gallery-header::after {
  content: '❧';
  display: block;
  margin-top: 20px;
  font-size: 1.5rem;
  color: var(--gold-leaf);
}

.gallery-header h1 {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  color: var(--ink-brown);
  margin-bottom: 12px;
  text-transform: uppercase;
}

.gallery-header .subtitle {
  font-family: var(--font-body);
  color: var(--ink-sepia);
  font-size: 1.1rem;
  font-style: italic;
  font-weight: 400;
}

.gallery-header .hint {
  font-family: var(--font-body);
  color: var(--vellum-shadow);
  font-size: 0.85rem;
  font-style: italic;
  margin-top: 8px;
}

/* ==========================================================================
   Offset Grid Layout (Honeycomb Pattern)
   4-3-4-3 pattern: Row 1 has 4, Row 2 has 3 offset, Row 3 has 4, Row 4 has 3 offset
   ========================================================================== */

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, var(--circle-size));
  gap: var(--circle-gap);
  justify-content: center;
  padding: 0 20px;
}

/* Row 2: items 5-7, offset (3 items) */
.layout-card:nth-child(5),
.layout-card:nth-child(6),
.layout-card:nth-child(7) {
  transform: translateX(var(--row-offset));
}

/* Force item 8 to start new row */
.layout-card:nth-child(8) {
  grid-column: 1;
}

/* Row 4: items 12-14, offset (3 items) */
.layout-card:nth-child(12),
.layout-card:nth-child(13),
.layout-card:nth-child(14) {
  transform: translateX(var(--row-offset));
}

/* Force item 12 to start new row */
.layout-card:nth-child(12) {
  grid-column: 1;
}

/* ==========================================================================
   Layout Card
   ========================================================================== */

.layout-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

/* ==========================================================================
   Circular Viewport - Medallion Style
   ========================================================================== */

.circle-viewport {
  width: var(--circle-size);
  height: var(--circle-size);
  border-radius: 50%;
  background: var(--vellum);
  border: 3px solid var(--vellum-shadow);
  overflow: hidden;
  position: relative;
  box-shadow:
    inset 0 2px 8px rgba(0, 0, 0, 0.08),
    0 4px 12px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

/* Inner decorative ring */
.circle-viewport::before {
  content: '';
  position: absolute;
  inset: 6px;
  border-radius: 50%;
  border: 1px solid var(--vellum-shadow);
  pointer-events: none;
  z-index: 10;
}

.circle-viewport:hover {
  box-shadow:
    inset 0 2px 8px rgba(0, 0, 0, 0.08),
    0 8px 24px rgba(0, 0, 0, 0.15);
  transform: scale(1.02);
}

/* SVG inside circle */
.circle-viewport svg {
  width: 100%;
  height: 100%;
}

/* ==========================================================================
   Card Labels - Manuscript Script Style
   ========================================================================== */

.layout-label {
  text-align: center;
}

.layout-label h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0 0 2px 0;
  color: var(--ink-brown);
  letter-spacing: 0.05em;
}

.layout-label p {
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--ink-sepia);
  font-style: italic;
  margin: 0;
}

/* ==========================================================================
   Accent Colors per Layout Type
   ========================================================================== */

.layout-card[data-layout="tree-horizontal"] .circle-viewport,
.layout-card[data-layout="tree-radial"] .circle-viewport {
  border-color: var(--color-tree);
}

.layout-card[data-layout="cluster-horizontal"] .circle-viewport,
.layout-card[data-layout="cluster-radial"] .circle-viewport {
  border-color: var(--color-cluster);
}

.layout-card[data-layout="pack"] .circle-viewport {
  border-color: var(--color-pack);
}

.layout-card[data-layout="partition-sunburst"] .circle-viewport,
.layout-card[data-layout="partition-icicle"] .circle-viewport {
  border-color: var(--color-partition);
}

.layout-card[data-layout="treemap"] .circle-viewport {
  border-color: var(--color-treemap);
}

.layout-card[data-layout="chord"] .circle-viewport {
  border-color: var(--color-chord);
}

.layout-card[data-layout="sankey"] .circle-viewport {
  border-color: var(--color-sankey);
}

.layout-card[data-layout="edge-bundle"] .circle-viewport {
  border-color: var(--color-edge);
}

.layout-card[data-layout="adjacency"] .circle-viewport {
  border-color: var(--color-adjacency);
}

/* Hover - gold illumination effect */
.layout-card:hover .circle-viewport {
  border-color: var(--gold-leaf);
}

.layout-card:hover .layout-label h3 {
  color: var(--gold-leaf);
}

/* ==========================================================================
   Footer - Colophon Style
   ========================================================================== */

.gallery-footer {
  text-align: center;
  margin-top: 80px;
  padding-top: 40px;
  border-top: 1px solid var(--vellum-shadow);
  position: relative;
}

.gallery-footer::before {
  content: '✠';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--vellum);
  padding: 0 20px;
  font-size: 1.2rem;
  color: var(--gold-leaf);
}

.gallery-footer p {
  font-family: var(--font-body);
  color: var(--ink-sepia);
  font-size: 0.95rem;
  font-style: italic;
}

.gallery-footer a {
  color: var(--ultramarine);
  text-decoration: none;
}

.gallery-footer a:hover {
  color: var(--gold-leaf);
  text-decoration: underline;
}

/* ==========================================================================
   Responsive Adjustments
   ========================================================================== */

@media (max-width: 1800px) {
  :root {
    --circle-size: 340px;
    --row-offset: 186px;
  }
}

@media (max-width: 1500px) {
  :root {
    --circle-size: 300px;
    --row-offset: 166px;
  }

  .gallery-grid {
    grid-template-columns: repeat(3, var(--circle-size));
  }

  /* Reset desktop-specific rules */
  .layout-card:nth-child(5),
  .layout-card:nth-child(6),
  .layout-card:nth-child(7),
  .layout-card:nth-child(12) {
    transform: none;
    grid-column: auto;
  }

  .layout-card:nth-child(8) {
    grid-column: auto;
  }

  /* 3-column pattern: 3-2-3-2-2 */
  .layout-card:nth-child(4),
  .layout-card:nth-child(5),
  .layout-card:nth-child(9),
  .layout-card:nth-child(10) {
    transform: translateX(var(--row-offset));
  }

  .layout-card:nth-child(4) {
    grid-column: 1;
  }

  .layout-card:nth-child(6) {
    grid-column: 1;
  }

  .layout-card:nth-child(11) {
    grid-column: 1;
  }
}

@media (max-width: 1100px) {
  :root {
    --circle-size: 280px;
  }

  .gallery-grid {
    grid-template-columns: repeat(2, var(--circle-size));
  }

  /* Reset previous rules */
  .layout-card:nth-child(n) {
    transform: none;
    grid-column: auto;
  }

  /* 2-column offset pattern */
  .layout-card:nth-child(3),
  .layout-card:nth-child(4),
  .layout-card:nth-child(7),
  .layout-card:nth-child(8),
  .layout-card:nth-child(11),
  .layout-card:nth-child(12) {
    transform: translateX(var(--row-offset));
  }

  .layout-card:nth-child(3),
  .layout-card:nth-child(5),
  .layout-card:nth-child(7),
  .layout-card:nth-child(9),
  .layout-card:nth-child(11) {
    grid-column: 1;
  }
}

@media (max-width: 700px) {
  :root {
    --circle-size: 320px;
  }

  .gallery-grid {
    grid-template-columns: 1fr;
    justify-items: center;
  }

  .layout-card,
  .layout-card:nth-child(n) {
    transform: none !important;
    grid-column: auto !important;
  }

  .gallery-header h1 {
    font-size: 2rem;
    letter-spacing: 0.1em;
  }
}

/* ==========================================================================
   Coordinated Highlighting - Cross-View Node Emphasis
   ========================================================================== */

/* Base node styling */
.node {
  cursor: pointer;
  transition: opacity 0.15s ease, fill 0.15s ease, r 0.15s ease;
}

/* Base link styling */
.link {
  transition: opacity 0.15s ease, stroke 0.15s ease, stroke-width 0.15s ease;
}

/* Primary highlight - the hovered node itself */
.node.highlight-primary {
  opacity: 1 !important;
  fill: var(--gold-bright) !important;
  stroke: var(--ink-brown);
  stroke-width: 2px;
}

.link.highlight-primary {
  opacity: 1 !important;
  stroke: var(--gold-bright) !important;
  stroke-width: 2.5px !important;
}

/* Related highlight - ancestors and descendants */
.node.highlight-related {
  opacity: 0.9 !important;
  stroke: var(--gold-leaf);
  stroke-width: 1.5px;
}

.link.highlight-related {
  opacity: 0.8 !important;
  stroke: var(--gold-leaf) !important;
  stroke-width: 1.5px !important;
}

/* Dimmed - unrelated nodes when something is hovered */
.node.highlight-dimmed {
  opacity: 0.2 !important;
}

.link.highlight-dimmed {
  opacity: 0.1 !important;
}

/* Pack circles - special handling for nested circles */
.pack-circle {
  cursor: pointer;
  transition: opacity 0.15s ease, stroke 0.15s ease, stroke-width 0.15s ease;
}

.pack-circle.highlight-primary {
  opacity: 1 !important;
  stroke: var(--gold-bright) !important;
  stroke-width: 3px !important;
}

.pack-circle.highlight-related {
  opacity: 0.9 !important;
  stroke: var(--gold-leaf) !important;
  stroke-width: 2px !important;
}

.pack-circle.highlight-dimmed {
  opacity: 0.15 !important;
}

/* Partition arcs (Sunburst/Icicle) */
.partition-arc {
  cursor: pointer;
  transition: opacity 0.15s ease, stroke 0.15s ease;
}

.partition-arc.highlight-primary {
  opacity: 1 !important;
  stroke: var(--gold-bright) !important;
  stroke-width: 2px !important;
}

.partition-arc.highlight-related {
  opacity: 0.9 !important;
  stroke: var(--gold-leaf) !important;
  stroke-width: 1px !important;
}

.partition-arc.highlight-dimmed {
  opacity: 0.15 !important;
}

/* Treemap rectangles */
.treemap-rect {
  cursor: pointer;
  transition: opacity 0.15s ease, stroke 0.15s ease;
}

.treemap-rect.highlight-primary {
  opacity: 1 !important;
  stroke: var(--gold-bright) !important;
  stroke-width: 3px !important;
}

.treemap-rect.highlight-related {
  opacity: 0.9 !important;
  stroke: var(--gold-leaf) !important;
  stroke-width: 2px !important;
}

.treemap-rect.highlight-dimmed {
  opacity: 0.2 !important;
}

/* ==========================================================================
   Flow Layouts - Sankey, Chord, Edge Bundle, Adjacency
   ========================================================================== */

/* Sankey nodes */
.sankey-node {
  cursor: pointer;
  transition: opacity 0.15s ease, fill 0.15s ease;
}

.sankey-node.highlight-primary {
  opacity: 1 !important;
  fill: var(--gold-bright) !important;
}

.sankey-node.highlight-related {
  opacity: 0.9 !important;
  fill: var(--gold-leaf) !important;
}

.sankey-node.highlight-dimmed {
  opacity: 0.2 !important;
}

/* Sankey links */
.sankey-link {
  transition: opacity 0.15s ease, fill 0.15s ease;
}

.sankey-link.highlight-primary {
  opacity: 1 !important;
  fill: rgba(212, 175, 55, 0.7) !important;
}

.sankey-link.highlight-related {
  opacity: 0.8 !important;
  fill: rgba(201, 162, 39, 0.5) !important;
}

.sankey-link.highlight-dimmed {
  opacity: 0.1 !important;
}

/* Chord arcs */
.chord-arc {
  cursor: pointer;
  transition: opacity 0.15s ease, fill 0.15s ease;
}

.chord-arc.highlight-primary {
  opacity: 1 !important;
  fill: var(--gold-bright) !important;
}

.chord-arc.highlight-related {
  opacity: 0.9 !important;
  fill: var(--gold-leaf) !important;
}

.chord-arc.highlight-dimmed {
  opacity: 0.2 !important;
}

/* Chord ribbons */
.chord-ribbon {
  transition: opacity 0.15s ease, fill 0.15s ease;
}

.chord-ribbon.highlight-primary {
  opacity: 1 !important;
  fill: rgba(212, 175, 55, 0.7) !important;
}

.chord-ribbon.highlight-related {
  opacity: 0.8 !important;
  fill: rgba(201, 162, 39, 0.5) !important;
}

.chord-ribbon.highlight-dimmed {
  opacity: 0.1 !important;
}

/* Edge bundle nodes */
.bundle-node {
  cursor: pointer;
  transition: opacity 0.15s ease, fill 0.15s ease, r 0.15s ease;
}

.bundle-node.highlight-primary {
  opacity: 1 !important;
  fill: var(--gold-bright) !important;
}

.bundle-node.highlight-related {
  opacity: 0.9 !important;
  fill: var(--gold-leaf) !important;
}

.bundle-node.highlight-dimmed {
  opacity: 0.2 !important;
}

/* Edge bundle links */
.bundle-link {
  transition: opacity 0.15s ease, stroke 0.15s ease, stroke-width 0.15s ease;
}

.bundle-link.highlight-primary {
  opacity: 1 !important;
  stroke: var(--gold-bright) !important;
  stroke-width: 2px !important;
}

.bundle-link.highlight-related {
  opacity: 0.8 !important;
  stroke: var(--gold-leaf) !important;
  stroke-width: 1.5px !important;
}

.bundle-link.highlight-dimmed {
  opacity: 0.05 !important;
}

/* Adjacency cells */
.adjacency-cell {
  cursor: pointer;
  transition: opacity 0.15s ease, fill 0.15s ease;
}

.adjacency-cell.highlight-primary {
  fill: var(--gold-bright) !important;
  fill-opacity: 1 !important;
}

.adjacency-cell.highlight-related {
  fill: var(--gold-leaf) !important;
  fill-opacity: 0.8 !important;
}

.adjacency-cell.highlight-dimmed {
  opacity: 0.2 !important;
}

/* Adjacency labels */
.adjacency-label {
  transition: fill 0.15s ease, font-weight 0.15s ease;
}

.adjacency-label.highlight-primary {
  fill: var(--ink-brown) !important;
  font-weight: bold !important;
}

.adjacency-label.highlight-related {
  fill: var(--gold-leaf) !important;
  font-weight: 600 !important;
}

.adjacency-label.highlight-dimmed {
  opacity: 0.3 !important;
}

/* ==========================================================================
   Gallery Navigation
   ========================================================================== */

.gallery-nav {
  margin-top: 12px;
}

.gallery-nav a {
  color: var(--ultramarine);
  text-decoration: none;
  font-style: italic;
  font-size: 0.95rem;
}

.gallery-nav a:hover {
  color: var(--gold-leaf);
  text-decoration: underline;
}

/* ==========================================================================
   Masonry Demo
   ========================================================================== */

.masonry-demo {
  max-width: 900px;
  margin: 0 auto;
  padding: 60px 40px 80px;
}

.masonry-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.masonry-label {
  font-family: var(--font-body);
  color: var(--ink-sepia);
  font-size: 0.95rem;
  margin-right: 4px;
}

.masonry-btn {
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 6px 16px;
  border: 1px solid var(--vellum-shadow);
  border-radius: 4px;
  background: var(--vellum);
  color: var(--ink-brown);
  cursor: pointer;
  transition: all 0.15s ease;
}

.masonry-btn:hover {
  border-color: var(--gold-leaf);
  color: var(--gold-leaf);
}

.masonry-btn.active {
  background: var(--ultramarine);
  color: var(--vellum);
  border-color: var(--ultramarine);
}

.masonry-btn-regen {
  margin-left: auto;
  background: var(--vellum-dark);
  border-color: var(--ink-sepia);
}

.masonry-btn-regen:hover {
  background: var(--gold-leaf);
  color: var(--vellum);
  border-color: var(--gold-leaf);
}

.masonry-viewport {
  border: 1px solid var(--vellum-shadow);
  border-radius: 8px;
  padding: 16px;
  background: var(--vellum);
}

/* ==========================================================================
   Pattern Demo Shared Styles (shelf, waffle, stacked, waterfall, etc.)
   ========================================================================== */

.pattern-demo {
  max-width: 900px;
  margin: 0 auto;
  padding: 60px 40px 80px;
}

/* Gallery navigation links */
.gallery-nav {
  margin-top: 8px;
  font-size: 0.9rem;
}

.gallery-nav a {
  color: var(--ultramarine);
  text-decoration: none;
  transition: color 0.2s;
}

.gallery-nav a:hover {
  color: var(--gold-leaf);
}

/* Waffle chart legend */
.waffle-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--ink-brown);
}

.waffle-legend-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

.waffle-legend-swatch {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 2px;
}

/* ==========================================================================
   Landing Page
   ========================================================================== */

.landing-container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 80px 40px;
}

.landing-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 20px;
}

.landing-card {
  display: block;
  text-decoration: none;
  color: var(--ink-black);
  border: 2px solid var(--vellum-shadow);
  border-radius: 8px;
  padding: 32px 28px;
  background: var(--vellum);
  transition: all 0.25s ease;
  border-top: 4px solid var(--card-accent, var(--vellum-shadow));
}

.landing-card:hover {
  border-color: var(--card-accent, var(--gold-leaf));
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  transform: translateY(-2px);
}

.landing-card-body h2 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--ink-brown);
  margin: 0 0 12px 0;
  text-transform: uppercase;
}

.landing-card:hover h2 {
  color: var(--card-accent, var(--gold-leaf));
}

.landing-card-desc {
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--ink-sepia);
  font-style: italic;
  line-height: 1.5;
  margin: 0 0 16px 0;
}

.landing-card-count {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--vellum-shadow);
  margin: 0;
  letter-spacing: 0.05em;
}

.landing-card-preview {
  display: flex;
  justify-content: center;
  margin-bottom: 20px;
}

.landing-viewport {
  --circle-size: 200px;
  width: 200px;
  height: 200px;
  pointer-events: none;
  transition: border-color 0.25s ease;
}

.landing-card:hover .landing-viewport {
  border-color: var(--card-accent, var(--gold-leaf));
}

@media (max-width: 800px) {
  .landing-cards {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
  }
}

/* ==========================================================================
   Hierarchy Grid (10 items: 4-3-3)
   ========================================================================== */

.hierarchy-grid {
  grid-template-columns: repeat(4, var(--circle-size));
}

/* Row 2: items 5-7, offset */
.hierarchy-grid .layout-card:nth-child(5),
.hierarchy-grid .layout-card:nth-child(6),
.hierarchy-grid .layout-card:nth-child(7) {
  transform: translateX(var(--row-offset));
}

/* Force item 8 to new row */
.hierarchy-grid .layout-card:nth-child(8) {
  grid-column: 1;
}

/* Row 3: items 8-10, offset */
.hierarchy-grid .layout-card:nth-child(8),
.hierarchy-grid .layout-card:nth-child(9),
.hierarchy-grid .layout-card:nth-child(10) {
  transform: translateX(var(--row-offset));
}

/* ==========================================================================
   Flow Grid (4 items: single row)
   ========================================================================== */

.flow-grid {
  grid-template-columns: repeat(3, var(--circle-size));
}

/* No offset needed for single row */
.flow-grid .layout-card:nth-child(n) {
  transform: none;
}

@media (max-width: 1500px) {
  .hierarchy-grid {
    grid-template-columns: repeat(3, var(--circle-size));
  }

  /* Reset 4-col hierarchy rules */
  .hierarchy-grid .layout-card:nth-child(5),
  .hierarchy-grid .layout-card:nth-child(6),
  .hierarchy-grid .layout-card:nth-child(7),
  .hierarchy-grid .layout-card:nth-child(8),
  .hierarchy-grid .layout-card:nth-child(9),
  .hierarchy-grid .layout-card:nth-child(10) {
    transform: none;
    grid-column: auto;
  }

  /* 3-col hierarchy: 3-2-3-2 offset */
  .hierarchy-grid .layout-card:nth-child(4),
  .hierarchy-grid .layout-card:nth-child(5) {
    transform: translateX(var(--row-offset));
  }
  .hierarchy-grid .layout-card:nth-child(4) {
    grid-column: 1;
  }
  .hierarchy-grid .layout-card:nth-child(6) {
    grid-column: 1;
  }
  .hierarchy-grid .layout-card:nth-child(9),
  .hierarchy-grid .layout-card:nth-child(10) {
    transform: translateX(var(--row-offset));
  }

  .flow-grid {
    grid-template-columns: repeat(2, var(--circle-size));
  }
  .flow-grid .layout-card:nth-child(n) {
    transform: none;
  }
}

@media (max-width: 1100px) {
  .hierarchy-grid {
    grid-template-columns: repeat(2, var(--circle-size));
  }
  .hierarchy-grid .layout-card:nth-child(n) {
    transform: none;
    grid-column: auto;
  }

  .flow-grid {
    grid-template-columns: repeat(2, var(--circle-size));
  }
}

@media (max-width: 700px) {
  .hierarchy-grid,
  .flow-grid {
    grid-template-columns: 1fr;
    justify-items: center;
  }
  .hierarchy-grid .layout-card:nth-child(n),
  .flow-grid .layout-card:nth-child(n) {
    transform: none !important;
    grid-column: auto !important;
  }
}

/* ==========================================================================
   Pattern Page
   ========================================================================== */

.pattern-page {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 40px 80px;
}

.pattern-page-header {
  padding-top: 60px;
}

/* Remove individual demo padding/margins when composed on pattern page */
.pattern-section .masonry-demo,
.pattern-section .pattern-demo {
  padding: 0;
  max-width: none;
}

/* Remove individual demo headers — the parent page has one */
.pattern-section .gallery-header {
  border-bottom: none;
  margin-bottom: 24px;
  padding-bottom: 0;
}

.pattern-section .gallery-header::after {
  display: none;
}

/* Hide the back-links within child demos on the composed page */
.pattern-section .gallery-header .hint {
  display: none;
}

.pattern-divider {
  text-align: center;
  padding: 40px 0;
  color: var(--gold-leaf);
  font-size: 1.2rem;
}

.pattern-divider span {
  display: inline-block;
  position: relative;
}

.pattern-divider::before,
.pattern-divider::after {
  content: '';
  display: inline-block;
  width: 80px;
  height: 1px;
  background: var(--vellum-shadow);
  vertical-align: middle;
  margin: 0 16px;
}

/* ==========================================================================
   Ribbon Page - Cycle Topology Variants
   ========================================================================== */

.ribbon-grid {
  display: flex;
  flex-direction: column;
  gap: 48px;
  max-width: 1200px;
  margin: 0 auto;
}

.ribbon-card {
  border: 2px solid var(--vellum-shadow);
  border-radius: 8px;
  background: var(--vellum);
  padding: 24px 32px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.ribbon-card-header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 4px;
}

.ribbon-card-header h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--ink-brown);
  margin: 0;
}

.ribbon-topology-badge {
  font-family: var(--font-body);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  padding: 2px 10px;
  border-radius: 12px;
  font-weight: 600;
}

.topology-Acyclic {
  background: #e8f0e4;
  color: var(--forest-green);
}

.topology-EndCyclic {
  background: #e4e8f0;
  color: var(--ultramarine);
}

.topology-InteriorCyclic {
  background: #f0e8e4;
  color: var(--ochre);
}

.topology-MixedCyclic {
  background: #f0e4ea;
  color: var(--tyrian-purple);
}

.ribbon-card-description {
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--ink-sepia);
  margin: 0 0 16px 0;
}

.ribbon-viewport {
  width: 100%;
  min-height: 200px;
  border-top: 1px solid var(--vellum-shadow);
  padding-top: 16px;
}

.ribbon-viewport svg {
  width: 100%;
  height: auto;
  display: block;
}

/* Generalized flow note — manuscript medallion style, rectangular */
.ribbon-note {
  background: var(--vellum);
  border: 3px solid var(--vellum-shadow);
  border-radius: 8px;
  padding: 28px 36px;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  box-shadow:
    inset 0 2px 8px rgba(0, 0, 0, 0.06),
    0 4px 12px rgba(0, 0, 0, 0.08);
}

/* Inner decorative border */
.ribbon-note::before {
  content: '';
  position: absolute;
  inset: 6px;
  border-radius: 4px;
  border: 1px solid var(--vellum-shadow);
  pointer-events: none;
}

.ribbon-note p {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-style: italic;
  color: var(--ink-sepia);
  line-height: 1.7;
  margin: 0;
  text-align: center;
}

.ribbon-note a {
  color: var(--ultramarine);
  font-style: normal;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid var(--vellum-shadow);
}

.ribbon-note a:hover {
  border-bottom-color: var(--ultramarine);
}