/* Geometry lessons are static evidence views: no script, form, tracker, or
   runtime fetch is required to read the complete human account. */

/* The memetic lesson is a cultural-artifact lane beside the physical-domain
   lessons. Every rule is page-scoped; people are never encoded as nodes or
   propagation arrows. */
.memetic-landscape-page .memetic-map {
  margin: 1.5rem 0;
  padding: clamp(0.75rem, 2.5vw, 1.5rem);
  overflow-x: auto;
  border: 1px solid var(--border-bright);
  border-radius: var(--r-xl);
  background: var(--geometry-landscape-bg);
  box-shadow: var(--shadow-card);
}

.memetic-landscape-page .memetic-stage-sequence {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 0.45rem;
  margin: 1rem 0 0.75rem;
  padding: 0;
  list-style: none;
  counter-reset: memetic-stage;
}

.memetic-landscape-page .memetic-stage-sequence li {
  counter-increment: memetic-stage;
  padding: 0.55rem 0.35rem;
  border: 1px solid color-mix(in srgb, var(--geometry-accent-readable) 34%, transparent);
  border-radius: 999px;
  background: color-mix(in srgb, var(--geometry-accent-readable) 8%, transparent);
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.72rem;
  text-align: center;
}

.memetic-landscape-page .memetic-stage-sequence li::before {
  content: counter(memetic-stage, decimal-leading-zero) " · ";
  color: var(--geometry-accent-readable);
}

.memetic-landscape-page .memetic-map:focus-visible,
.memetic-landscape-page .memetic-crosswalk-wrap:focus-visible {
  outline: 3px solid var(--geometry-accent-readable);
  outline-offset: 3px;
}

.memetic-landscape-page .memetic-map svg {
  width: 100%;
  min-width: 700px;
  height: auto;
}

.memetic-landscape-page .memetic-map figcaption {
  margin-top: 0.65rem;
  color: var(--text-muted);
  font-size: 0.82rem;
}

.memetic-landscape-page .memetic-context {
  fill: color-mix(in srgb, var(--surface) 72%, #dbe8db);
  stroke: var(--border-bright);
  stroke-width: 2;
}

.memetic-landscape-page .memetic-node {
  fill: #f8eee1;
  stroke: var(--geometry-accent-readable);
  stroke-width: 2.5;
}

.memetic-landscape-page .memetic-node.remix {
  fill: #f1ead3;
  stroke: var(--geometry-inference-readable);
}

.memetic-landscape-page .memetic-node.reply {
  fill: #e5ece4;
  stroke: var(--geometry-fact-readable);
}

.memetic-landscape-page .memetic-route {
  fill: none;
  stroke: var(--geometry-accent-readable);
  stroke-width: 3;
  color: var(--geometry-accent-readable);
}

.memetic-landscape-page .memetic-route + text {
  fill: var(--geometry-accent-readable);
}

.memetic-landscape-page .memetic-non-implication {
  fill: none;
  stroke: var(--text-dim);
  stroke-width: 1.5;
  stroke-dasharray: 5 7;
  opacity: 0.58;
}

.memetic-landscape-page .memetic-map-caption {
  fill: var(--text-muted);
  font-family: var(--mono);
  font-size: 13px;
}

.memetic-landscape-page .memetic-map-boundary {
  fill: var(--text-muted);
  font-family: var(--sans);
  font-size: 14px;
}

.memetic-landscape-page .memetic-event-row circle {
  fill: var(--surface);
  stroke: var(--geometry-analogy-readable);
  stroke-width: 2;
}

.memetic-landscape-page .memetic-event-row text {
  fill: var(--text);
  font-family: var(--mono);
  font-size: 12px;
}

.memetic-landscape-page .memetic-not-equal-row text {
  fill: var(--geometry-accent-readable);
  font: 700 21px var(--sans);
}

.memetic-landscape-page .memetic-boundary-banner,
.memetic-landscape-page .memetic-wake-card,
.memetic-landscape-page .memetic-do-not-transfer,
.memetic-landscape-page .memetic-brakes {
  margin: 1.5rem 0;
  padding: clamp(1.2rem, 3vw, 2rem);
  border: 1px solid var(--border-bright);
  border-radius: var(--r-xl);
  background: color-mix(in srgb, var(--surface) 84%, #ead8c8);
}

.memetic-landscape-page .memetic-boundary-kicker,
.memetic-landscape-page .memetic-locale-label,
.memetic-landscape-page .memetic-wake-key,
.memetic-landscape-page .memetic-lens-number {
  margin: 0 0 0.45rem;
  color: var(--geometry-accent-readable);
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.memetic-landscape-page .memetic-boundary-big {
  margin: 0 0 0.8rem;
  font-family: var(--serif);
  font-size: clamp(1.6rem, 4vw, 2.7rem);
  line-height: 1.05;
}

.memetic-landscape-page .memetic-two-up {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.memetic-landscape-page .memetic-lens-grid,
.memetic-landscape-page .memetic-rights-grid,
.memetic-landscape-page .memetic-wake-card,
.memetic-landscape-page .memetic-wire-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
  margin: 1.5rem 0;
}

.memetic-landscape-page .memetic-lens-card,
.memetic-landscape-page .memetic-rights-grid article,
.memetic-landscape-page .memetic-locale-stack article,
.memetic-landscape-page .memetic-wire-grid article {
  padding: 1.15rem;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--surface);
  box-shadow: var(--shadow-card);
}

.memetic-landscape-page .memetic-lens-card h3,
.memetic-landscape-page .memetic-rights-grid h3,
.memetic-landscape-page .memetic-wire-grid h3 {
  margin: 0 0 0.55rem;
  font-size: 1rem;
}

.memetic-landscape-page .memetic-lens-card p,
.memetic-landscape-page .memetic-rights-grid p,
.memetic-landscape-page .memetic-wire-grid p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.memetic-landscape-page .memetic-lens-card .conditions {
  padding-top: 0.7rem;
  border-top: 1px solid var(--border);
  font-size: 0.78rem;
}

.memetic-landscape-page .memetic-crosswalk-wrap {
  margin: 1.5rem 0;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
}

.memetic-landscape-page .memetic-crosswalk {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
  background: var(--surface);
  font-size: 0.84rem;
}

.memetic-landscape-page .memetic-crosswalk th,
.memetic-landscape-page .memetic-crosswalk td {
  padding: 0.8rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.memetic-landscape-page .memetic-crosswalk thead th {
  background: color-mix(in srgb, var(--surface) 70%, #ead8c8);
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.memetic-landscape-page .memetic-crosswalk tbody th {
  color: var(--geometry-accent-readable);
  font-family: var(--mono);
}

.memetic-landscape-page .memetic-do-not-transfer {
  border-left: 5px solid var(--geometry-accent-readable);
}

.memetic-landscape-page .memetic-do-not-transfer h3,
.memetic-landscape-page .memetic-brakes h3 {
  margin-top: 0;
}

.memetic-landscape-page .memetic-brakes {
  border-left: 5px solid var(--geometry-fact-readable);
  background: color-mix(in srgb, var(--surface) 84%, #dbe8db);
}

.memetic-landscape-page .memetic-brake-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}

.memetic-landscape-page .memetic-brake-list li {
  padding: 0.42rem 0.7rem;
  border: 1px solid var(--border-bright);
  border-radius: 999px;
  background: var(--surface);
  font-family: var(--mono);
  font-size: 0.76rem;
}

.memetic-landscape-page .memetic-locale-stack {
  display: grid;
  gap: 0.8rem;
  margin: 1.5rem 0;
}

.memetic-landscape-page .memetic-locale-stack article {
  box-shadow: none;
}

.memetic-landscape-page .memetic-locale-stack article p:last-child {
  margin-bottom: 0;
}

.memetic-landscape-page .memetic-wake-card {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.memetic-landscape-page .memetic-wake-card > div {
  min-width: 0;
}

.memetic-landscape-page .memetic-wake-card p:last-child {
  margin-bottom: 0;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.memetic-landscape-page .memetic-compact-sources li {
  margin-bottom: 0.75rem;
}

@media (max-width: 760px) {
  .memetic-landscape-page .memetic-stage-sequence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .memetic-landscape-page .memetic-lens-grid,
  .memetic-landscape-page .memetic-rights-grid,
  .memetic-landscape-page .memetic-wake-card,
  .memetic-landscape-page .memetic-wire-grid,
  .memetic-landscape-page .memetic-two-up {
    grid-template-columns: 1fr;
  }
}

:root {
  /* These ink colors are deliberately darker than the estate's decorative
     terracotta/green/gold tokens. Each clears WCAG AA for small text on the
     exact dawn surfaces used below; color remains decorative, never the only
     link or evidence-kind affordance. */
  --geometry-accent-readable: #873017;
  --geometry-fact-readable: #32703f;
  --geometry-inference-readable: #775a12;
  --geometry-analogy-readable: #3d5a8a;
  --geometry-stage-number-bg: #f0dccd;
  --geometry-landscape-bg: #f3ecdf;
  --geometry-basin-bg: #efe6d4;
  --geometry-form-two-bg: #e4e5e8;
}

.estate-strip a.here,
.topnav .brand-text > span,
.topnav .nav-actions a.active,
.geometry-hero .eyebrow {
  color: var(--geometry-accent-readable);
}

.geometry-hero .eyebrow::before {
  background: var(--geometry-accent-readable);
}

.geometry-hero h1 em {
  background: none;
  background-clip: border-box;
  -webkit-background-clip: border-box;
  color: var(--geometry-accent-readable);
  -webkit-text-fill-color: currentColor;
}

.topnav .nav-cta,
.topnav .nav-cta:hover {
  background: var(--geometry-accent-readable);
  color: #faf5ec !important;
}

.estate-strip a:focus-visible,
.topnav a:focus-visible,
.geometry-shell a:focus-visible,
.site-footer a:focus-visible {
  outline: 3px solid var(--geometry-accent-readable);
  outline-offset: 3px;
}

.geometry-shell {
  max-width: 1180px;
  margin: 0 auto;
  padding: calc(var(--nav-height) + 2rem) 1.75rem 3rem;
}

.geometry-hero {
  position: relative;
  max-width: 940px;
  padding: clamp(2rem, 6vw, 4.5rem) 0 2.5rem;
  overflow: clip;
}

.geometry-hero::before {
  display: none;
}

.geometry-hero h1 {
  max-width: 860px;
}

.geometry-hero .lede {
  max-width: 800px;
  font-size: clamp(1.08rem, 2vw, 1.3rem);
}

.geometry-links,
.geometry-stats,
.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin: 1.25rem 0 0;
}

.geometry-stats {
  padding: 0;
  list-style: none;
}

.geometry-links a,
.stat-chip,
.evidence-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  border: 1px solid var(--border-bright);
  border-radius: var(--r-pill);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  padding: 0.38rem 0.72rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  line-height: 1.35;
}

.geometry-links a:hover {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 7%, var(--surface));
}

.stat-chip {
  margin: 0;
  color: var(--text-muted);
}

.geometry-content p a,
.source-list a {
  color: var(--geometry-accent-readable);
  text-decoration-line: underline;
  text-decoration-thickness: 0.09em;
  text-underline-offset: 0.16em;
  text-decoration-skip-ink: auto;
}

.geometry-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 250px;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.geometry-content {
  min-width: 0;
  max-width: 840px;
}

.geometry-content h2 {
  margin-top: 4.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.geometry-content h2:first-child {
  margin-top: 0;
}

.lesson-nav {
  position: sticky;
  top: calc(var(--nav-height) + 1rem);
  padding: 1.1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  box-shadow: var(--shadow-card);
}

.lesson-nav h2 {
  margin: 0 0 0.75rem;
  padding: 0;
  border: 0;
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.lesson-nav ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.lesson-nav li {
  margin: 0;
}

.lesson-nav a {
  display: block;
  padding: 0.42rem 0.55rem;
  border-left: 2px solid transparent;
  border-radius: var(--r-sm);
  color: var(--text-muted);
  font-size: 0.82rem;
}

.lesson-nav a:hover {
  color: var(--accent-text);
  border-left-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 6%, transparent);
}

.core-account {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
  margin: 1.5rem 0;
  counter-reset: core-step;
}

.core-card {
  position: relative;
  min-height: 180px;
  padding: 1.15rem;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--surface);
  box-shadow: var(--shadow-card);
  counter-increment: core-step;
}

.core-card::before {
  content: "0" counter(core-step);
  display: block;
  margin-bottom: 0.8rem;
  font-family: var(--mono);
  font-size: 0.67rem;
  letter-spacing: 0.12em;
  color: var(--accent-text);
}

.core-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.core-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.landscape {
  margin: 1.5rem 0;
  padding: clamp(1rem, 3vw, 1.75rem);
  border: 1px solid var(--border-bright);
  border-radius: var(--r-xl);
  background: var(--geometry-landscape-bg);
  box-shadow: var(--shadow-card);
}

.landscape svg {
  width: 100%;
  height: auto;
  overflow: visible;
}

.landscape .basin {
  fill: var(--geometry-basin-bg);
  stroke: var(--border-bright);
  stroke-width: 2;
}

.landscape .basin.form-two {
  fill: var(--geometry-form-two-bg);
  stroke: color-mix(in srgb, var(--blue) 55%, var(--border));
}

.landscape .route {
  fill: none;
  stroke: var(--text-muted);
  stroke-width: 3;
}

.landscape .route.rare {
  stroke-dasharray: 8 7;
}

.landscape .route.seeded {
  stroke: var(--accent);
  stroke-width: 4;
}

.landscape #arrow-neutral path {
  fill: var(--text-muted);
}

.landscape #arrow-accent path {
  fill: var(--accent);
}

.landscape .node-title {
  fill: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  font-weight: 700;
}

.landscape .node-note,
.landscape .route-note {
  fill: var(--text-muted);
  font-family: var(--mono);
  font-size: 12px;
}

.landscape figcaption {
  margin-top: 1rem;
  color: var(--text-muted);
  font-size: 0.82rem;
}

.equation {
  display: block;
  margin: 1rem 0;
  padding: 0.9rem 1rem;
  overflow-wrap: anywhere;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--code-bg);
  color: var(--text-muted);
  font-family: var(--mono);
  font-size: 0.78rem;
}

.stage-list {
  display: grid;
  gap: 0.85rem;
  margin: 1.5rem 0;
}

.stage {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 1rem;
  padding: 1.1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: color-mix(in srgb, var(--surface) 82%, transparent);
}

.stage-number {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--geometry-stage-number-bg);
  color: var(--geometry-accent-readable);
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 700;
}

.stage h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
}

.stage p {
  margin: 0;
  color: var(--text-muted);
}

.claim-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
  margin: 1.5rem 0;
}

.claim-card {
  padding: 1.1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--surface);
}

.claim-card h3 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 0.6rem;
  font-family: var(--mono);
  font-size: 0.78rem;
}

.claim-card p {
  margin-bottom: 0.65rem;
}

.claim-card .conditions {
  margin: 0;
  padding-top: 0.65rem;
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 0.76rem;
}

.evidence-badge {
  padding: 0.18rem 0.48rem;
  font-size: 0.58rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.evidence-badge.fact {
  color: var(--geometry-fact-readable);
  border-color: color-mix(in srgb, var(--green) 45%, var(--border));
}

.evidence-badge.inference {
  color: var(--geometry-inference-readable);
  border-color: color-mix(in srgb, var(--gold) 45%, var(--border));
}

.evidence-badge.analogy {
  color: var(--geometry-analogy-readable);
  border-color: color-mix(in srgb, var(--blue) 45%, var(--border));
}

.question-grid,
.uncertainty-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
  margin: 1.5rem 0;
}

.question,
.uncertainty {
  padding: 1.1rem;
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--r-lg) var(--r-lg) 0;
  background: color-mix(in srgb, var(--accent) 5%, var(--surface));
}

.question h3,
.uncertainty h3 {
  margin: 0 0 0.45rem;
  font-size: 0.98rem;
}

.question p,
.uncertainty p {
  margin: 0;
  color: var(--text-muted);
}

.uncertainty {
  border-left-color: var(--gold);
  background: color-mix(in srgb, var(--gold) 5%, var(--surface));
}

.source-list {
  margin-left: 0;
  list-style: none;
  counter-reset: source;
}

.source-list li {
  position: relative;
  margin: 0;
  padding: 0.8rem 0 0.8rem 2.7rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
  counter-increment: source;
}

.source-list li::before {
  content: "S" counter(source, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.92rem;
  font-family: var(--mono);
  font-size: 0.64rem;
  color: var(--accent-text);
}

.source-list a {
  overflow-wrap: anywhere;
}

.provenance-box {
  margin: 1.5rem 0;
  padding: 1.15rem;
  border: 1px solid var(--border-bright);
  border-radius: var(--r-lg);
  background: var(--code-bg);
}

.provenance-box dl {
  display: grid;
  grid-template-columns: minmax(9rem, 0.35fr) minmax(0, 1fr);
  gap: 0.45rem 1rem;
  margin: 0;
}

.provenance-box dt {
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.provenance-box dd {
  min-width: 0;
  margin: 0;
  color: var(--text-muted);
  font-family: var(--mono);
  font-size: 0.72rem;
  overflow-wrap: anywhere;
}

.boundary-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 1.25rem 0;
  padding: 0;
  list-style: none;
}

.boundary-list li {
  margin: 0;
  padding: 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  color: var(--text-muted);
  background: color-mix(in srgb, var(--surface) 82%, transparent);
}

/* Forms, folds, and prion templating. The shapes are decorative; every
   distinction is repeated in adjacent text and the structured JSON. */

.lineage-content {
  max-width: 880px;
}

.stop-card {
  margin: 0 0 2rem;
  padding: clamp(1.2rem, 3vw, 1.8rem);
  border: 2px solid var(--geometry-analogy-readable);
  border-radius: var(--r-xl);
  background: color-mix(in srgb, var(--blue) 7%, var(--surface));
}

.stop-card h2 {
  margin: 0.65rem 0 0.65rem;
  padding: 0;
  border: 0;
}

.stop-card p:last-child {
  margin-bottom: 0;
  color: var(--text-muted);
}

.domain-lanes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
  margin: 1.5rem 0;
}

.domain-lane {
  position: relative;
  min-width: 0;
  padding: 1.2rem;
  overflow: clip;
  border: 1px solid var(--border-bright);
  border-radius: var(--r-xl);
  background: var(--surface);
  box-shadow: var(--shadow-card);
}

.domain-lane::after {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 4px;
  background: var(--geometry-accent-readable);
}

.folding-domain::after {
  background: var(--geometry-analogy-readable);
}

.amyloid-domain::after {
  background: var(--geometry-inference-readable);
}

.prion-domain::after {
  background: var(--geometry-fact-readable);
}

.domain-mark {
  width: 64px;
  height: 64px;
  display: grid;
  place-items: center;
  margin: 0 0 0.9rem auto;
  color: var(--geometry-accent-readable);
}

.crystal-domain .domain-mark {
  grid-template-columns: repeat(2, 18px);
  gap: 6px;
  transform: rotate(12deg);
}

.crystal-domain .domain-mark i {
  width: 18px;
  height: 18px;
  border: 2px solid currentColor;
  border-radius: 3px;
}

.folding-domain .domain-mark {
  color: var(--geometry-analogy-readable);
}

.folding-domain .domain-mark i {
  width: 54px;
  height: 38px;
  border: 3px solid currentColor;
  border-color: currentColor transparent currentColor currentColor;
  border-radius: 58% 42% 56% 44%;
  transform: rotate(-17deg);
}

.amyloid-domain .domain-mark {
  align-content: center;
  gap: 7px;
  color: var(--geometry-inference-readable);
}

.amyloid-domain .domain-mark i {
  width: 55px;
  height: 4px;
  border-radius: 4px;
  background: currentColor;
}

.amyloid-domain .domain-mark i:nth-child(2) {
  width: 43px;
  transform: translateX(6px);
}

.prion-domain .domain-mark {
  grid-template-columns: 30px 30px;
  color: var(--geometry-fact-readable);
}

.prion-domain .domain-mark i {
  width: 31px;
  height: 50px;
  border: 3px solid currentColor;
  border-right: 0;
  border-radius: 50% 0 0 50%;
}

.prion-domain .domain-mark i:last-child {
  border: 3px solid currentColor;
  border-left: 0;
  border-radius: 0 50% 50% 0;
  transform: translateX(-5px) rotate(180deg);
}

.lane-kicker {
  margin: 0 0 0.35rem;
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.domain-lane h3 {
  margin: 0 0 0.5rem;
  font-size: 1.16rem;
}

.domain-lane .lane-core {
  min-height: 3.8rem;
  color: var(--text);
  font-weight: 650;
}

.domain-lane dl {
  margin: 1rem 0;
  padding: 0.75rem 0;
  border-block: 1px solid var(--border);
}

.domain-lane dt {
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.domain-lane dd {
  margin: 0.18rem 0 0.7rem;
  color: var(--text-muted);
  font-size: 0.82rem;
}

.domain-lane dd:last-child {
  margin-bottom: 0;
}

.domain-lane details {
  border-radius: var(--r-md);
  background: color-mix(in srgb, var(--surface-2) 72%, transparent);
}

.domain-lane summary {
  padding: 0.7rem;
  cursor: pointer;
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 700;
}

.domain-lane summary:focus-visible {
  outline: 3px solid var(--geometry-accent-readable);
  outline-offset: 2px;
}

.domain-lane details p {
  margin: 0;
  padding: 0 0.7rem 0.8rem;
  color: var(--text-muted);
  font-size: 0.82rem;
}

.shape-flow {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.55rem;
  margin: 1.5rem 0;
  padding: 0;
  list-style: none;
}

.shape-flow li {
  position: relative;
  min-width: 0;
  margin: 0;
  padding: 1rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: color-mix(in srgb, var(--surface) 85%, transparent);
}

.shape-flow li:not(:last-child)::after {
  content: "→";
  position: absolute;
  z-index: 1;
  top: 50%;
  right: -0.72rem;
  width: 1rem;
  color: var(--geometry-analogy-readable);
  font-weight: 800;
  text-align: center;
  transform: translateY(-50%);
}

.shape-flow span,
.shape-flow strong,
.shape-flow small {
  display: block;
}

.shape-flow span {
  color: var(--geometry-accent-readable);
  font-family: var(--mono);
  font-size: 0.62rem;
}

.shape-flow strong {
  margin: 0.55rem 0 0.35rem;
  font-size: 0.86rem;
}

.shape-flow small {
  color: var(--text-muted);
  font-size: 0.72rem;
  line-height: 1.45;
}

.shape-floor,
.distinction-note {
  padding: 0.9rem 1rem;
  border-left: 4px solid var(--geometry-analogy-readable);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: color-mix(in srgb, var(--blue) 5%, var(--surface));
}

.math-grid,
.return-grid,
.insight-grid,
.kingdom-map {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
  margin: 1.5rem 0;
}

.math-card {
  min-width: 0;
  padding: 1.1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--surface);
}

.math-card.wide-math {
  grid-column: 1 / -1;
}

.math-card h3 {
  margin: 0.65rem 0;
  font-size: 1rem;
}

.math-card code {
  display: block;
  max-width: 100%;
  margin: 0.65rem 0 0.9rem;
  padding: 0.7rem;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--code-bg);
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.76rem;
  white-space: nowrap;
}

.math-card p {
  color: var(--text-muted);
}

.math-card .conditions {
  margin-bottom: 0;
  padding-top: 0.65rem;
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 0.76rem;
}

.mechanism-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.7rem;
  margin: 1.5rem 0;
}

.mechanism-grid article {
  min-width: 0;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: color-mix(in srgb, var(--surface) 84%, transparent);
}

.mechanism-grid span {
  color: var(--geometry-inference-readable);
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.mechanism-grid h3 {
  margin: 0.55rem 0 0.4rem;
  font-size: 0.9rem;
}

.mechanism-grid p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.78rem;
}

.return-card {
  padding: 1.2rem;
  border: 1px solid var(--border-bright);
  border-radius: var(--r-xl);
  background: color-mix(in srgb, var(--blue) 5%, var(--surface));
}

.karma-card {
  background: color-mix(in srgb, var(--gold) 6%, var(--surface));
}

.return-card h3 {
  margin: 0 0 0.7rem;
}

.return-card ol {
  margin: 0 0 1rem 1.2rem;
}

.return-card li {
  margin-bottom: 0.55rem;
  color: var(--text-muted);
}

.return-card p:last-child {
  margin-bottom: 0;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
}

.insight-grid article,
.kingdom-map article {
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: color-mix(in srgb, var(--surface) 84%, transparent);
}

.insight-grid h3,
.kingdom-map h3 {
  margin: 0 0 0.4rem;
  font-size: 0.95rem;
}

.insight-grid p,
.kingdom-map p {
  margin: 0;
  color: var(--text-muted);
}

.kingdom-map article {
  border-left: 4px solid var(--geometry-accent-readable);
  border-radius: 0 var(--r-lg) var(--r-lg) 0;
}

.hf-card {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(14rem, 0.8fr);
  gap: 1.2rem;
  margin: 1.5rem 0;
  padding: 1.2rem;
  border: 2px solid var(--geometry-inference-readable);
  border-radius: var(--r-xl);
  background: color-mix(in srgb, var(--gold) 5%, var(--surface));
}

.hf-card h3 {
  margin: 0.65rem 0;
  overflow-wrap: anywhere;
}

.hf-card code {
  overflow-wrap: anywhere;
}

.hf-card dl {
  margin: 0;
  padding: 0.8rem;
  border-radius: var(--r-md);
  background: color-mix(in srgb, var(--surface) 76%, transparent);
}

.hf-card dt {
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.hf-card dd {
  margin: 0.15rem 0 0.7rem;
  color: var(--text-muted);
  font-size: 0.78rem;
}

.hf-card dd:last-child {
  margin-bottom: 0;
}

.hf-link {
  display: inline-block;
  margin-top: 0.5rem;
  font-weight: 700;
}

.footer-mark {
  width: 14px;
  height: 14px;
  border-width: 1.5px;
}

@media (max-width: 900px) {
  .geometry-layout {
    grid-template-columns: 1fr;
  }

  .lesson-nav {
    position: static;
    order: -1;
  }

  .lesson-nav ol {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr));
  }

  .mechanism-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .shape-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .shape-flow li::after {
    display: none;
  }
}

@media (max-width: 680px) {
  .geometry-shell {
    padding-inline: 1.1rem;
  }

  .core-account,
  .claim-grid,
  .question-grid,
  .uncertainty-grid,
  .boundary-list,
  .domain-lanes,
  .math-grid,
  .return-grid,
  .insight-grid,
  .kingdom-map,
  .mechanism-grid,
  .shape-flow,
  .hf-card {
    grid-template-columns: 1fr;
  }

  .math-card.wide-math {
    grid-column: auto;
  }

  .domain-lane .lane-core {
    min-height: 0;
  }

  .stage {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 0.75rem;
  }

  .stage-number {
    width: 36px;
    height: 36px;
  }

  .provenance-box dl {
    grid-template-columns: 1fr;
  }

  .provenance-box dd {
    margin-bottom: 0.55rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

@media print {
  .estate-strip,
  .topnav,
  .lesson-nav,
  .geometry-links,
  .site-footer {
    display: none;
  }

  .geometry-shell {
    max-width: none;
    padding: 0;
  }

  .geometry-layout {
    display: block;
  }

  .core-card,
  .stage,
  .claim-card,
  .landscape,
  .domain-lane,
  .math-card,
  .return-card,
  .hf-card {
    break-inside: avoid;
    box-shadow: none;
  }

  .domain-lane details {
    display: block;
  }
}