@font-face {
  font-family: "Geist";
  src: url("/assets/fonts/Geist.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Geist Mono";
  src: url("/assets/fonts/GeistMono.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Geist Pixel";
  src: url("/assets/fonts/GeistPixel-Square.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

:root {
  --color-primary: #2f2d28;
  --color-secondary: #3f3b35;
  --color-muted: #70685e;
  --color-faint: #9a958c;
  --color-background: #fffdf9;
  --color-surface: #f6f1ea;
  --color-border: #e4dacd;
  --color-border-subtle: #ece5dc;
  --color-accent: #3f7468;
  --color-accent-soft: #e5f2ee;
  --color-code-background: #eef5f2;
  --color-definition: #2f7d57;
  --color-claim: #8a5d18;
  --color-representation: #3f7468;
  --color-system: #6d619f;
  --color-interface: #9a4f75;
  --color-practice: #966026;
  --color-diagram: #2f7480;
  --color-status: #8a681d;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;
  --space-page: 64px;
  --width-prose: 680px;
  --width-index: 760px;
  --width-shell: 960px;
  --font-body: "Geist", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-body: 16px;
  --text-title: 24px;
  --text-lede: 20px;
  --text-small: 14px;
  --text-ui: 13px;
  --text-micro: 12px;
  --line-body: 1.58;
  --line-compact: 1.35;
  --radius-sm: 4px;
  --border-subtle: 1px solid var(--color-border-subtle);
  --border-control: 1px solid var(--color-border);
  --control-height: 28px;
  --row-gap: 10px;

  color-scheme: light dark;
  color: var(--color-primary);
  background: var(--color-background);
  font-family: var(--font-body);
  font-size: var(--text-body);
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-primary: #f2efe8;
    --color-secondary: #e4ded4;
    --color-muted: #b8afa2;
    --color-faint: #888173;
    --color-background: #171613;
    --color-surface: #23211d;
    --color-border: #3b362f;
    --color-border-subtle: #2f2b25;
    --color-accent: #8ecabb;
    --color-accent-soft: #21332f;
    --color-code-background: #1f302d;
    --color-definition: #8fd6a8;
    --color-claim: #e2bc77;
    --color-representation: #8ecabb;
    --color-system: #b8b0f2;
    --color-interface: #e2a0c1;
    --color-practice: #d8a06d;
    --color-diagram: #8fd0dc;
    --color-status: #dec070;
  }
}

* {
  box-sizing: border-box;
}

html {
  background: var(--color-background);
}

body {
  max-width: calc(var(--width-shell) + 4rem);
  margin: 0 auto;
  padding: var(--space-page) 2rem;
  color: var(--color-primary);
  background: var(--color-background);
  font-weight: 350;
  line-height: 1.55;
}

.site-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-lg);
  max-width: var(--width-index);
  margin: 0 auto var(--space-page);
}

.site-title,
.site-nav {
  font-family: var(--font-mono);
  font-size: var(--text-small);
}

.site-title {
  color: var(--color-primary);
  text-decoration: none;
}

.site-nav {
  display: flex;
  gap: var(--space-md);
  color: var(--color-muted);
}

.site-nav a {
  position: relative;
  color: inherit;
}

.site-title[aria-current="page"] {
  color: var(--color-primary);
}

.site-nav a[aria-current] {
  color: var(--color-primary);
  text-decoration-line: underline;
  text-decoration-color: var(--color-accent);
  text-decoration-thickness: 0.12em;
}

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

:where(button, select, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

main {
  max-width: var(--width-prose);
  margin: 0 auto var(--space-page);
}

body[data-section="roadmap"] main:not(.lesson-shell):not(.graph-page),
body[data-section="lessons"] main:not(.lesson-shell):not(.graph-page),
body[data-section="sources"] main:not(.lesson-shell):not(.graph-page) {
  max-width: var(--width-index);
}

.home-intro {
  margin-bottom: var(--space-xl);
}

.focus-block {
  margin: var(--space-xl) 0;
  padding: var(--space-lg) 0;
  border-top: var(--border-subtle);
  border-bottom: var(--border-subtle);
}

.focus-block h2 {
  margin-top: var(--space-sm);
  font-size: var(--text-lede);
  line-height: 1.25;
}

.focus-block .meta-list {
  margin-bottom: 0;
}

h1 {
  margin: 0 0 var(--space-sm);
  font-size: var(--text-title);
  font-weight: 420;
  letter-spacing: 0;
  line-height: 1.16;
}

h2 {
  margin: var(--space-xl) 0 var(--space-md);
  font-size: var(--text-body);
  font-weight: 520;
  letter-spacing: 0;
  line-height: 1.45;
}

h3 {
  margin: var(--space-lg) 0 var(--space-sm);
  font-size: var(--text-body);
  font-weight: 500;
  letter-spacing: 0;
}

p {
  margin: var(--space-lg) 0;
  color: var(--color-secondary);
  font-size: var(--text-body);
  line-height: var(--line-body);
  overflow-wrap: break-word;
}

a {
  color: inherit;
  text-decoration: none;
  text-decoration-thickness: 0.06em;
  text-underline-offset: 3px;
  transition: color 150ms ease, text-decoration-color 150ms ease;
}

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

.article-page :where(p:not(.meta), li) > a:not(.pill):not(.artifact-link) {
  text-decoration-line: underline;
  text-decoration-color: color-mix(in srgb, currentColor, transparent 58%);
}

.article-page :where(p:not(.meta), li) > a:not(.pill):not(.artifact-link):hover {
  text-decoration-color: currentColor;
}

blockquote {
  margin: var(--space-lg) 0;
  padding: 0 0 0 var(--space-md);
  border-left: 1px solid var(--color-border);
  color: var(--color-muted);
}

blockquote p {
  color: inherit;
}

ul,
ol {
  margin: var(--space-md) 0 var(--space-lg);
  padding-left: 1.25rem;
  color: var(--color-secondary);
}

li {
  margin: var(--space-xs) 0;
  overflow-wrap: break-word;
}

hr {
  border: 0;
  border-top: var(--border-subtle);
  margin: var(--space-xl) 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-lg) 0;
  font-size: var(--text-small);
  overflow-wrap: break-word;
}

th,
td {
  border-top: var(--border-subtle);
  padding: var(--space-sm) 0;
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--color-primary);
  font-weight: 500;
}

code,
pre,
.meta,
.section-path,
.meta-list,
.compact-list a,
.compact-list span,
.item span,
.pill {
  font-family: var(--font-mono);
}

code {
  padding: 0.08em 0.28em;
  border-radius: var(--radius-sm);
  background: var(--color-code-background);
  font-size: var(--text-small);
  overflow-wrap: anywhere;
}

pre {
  overflow-x: auto;
  margin: var(--space-lg) 0;
  padding: var(--space-md);
  border-radius: var(--radius-sm);
  background: var(--color-code-background);
}

pre code {
  display: block;
  padding: 0;
  background: transparent;
  line-height: 1.55;
}

.diagram-source {
  background: var(--color-surface);
}

.diagram-block {
  margin: var(--space-xl) 0;
}

.diagram-viewer {
  overflow-x: auto;
  border: var(--border-subtle);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
}

.mermaid {
  display: flex;
  justify-content: center;
  padding: var(--space-md);
}

.mermaid svg {
  display: block;
  flex: 0 1 auto;
  width: auto;
  max-width: 100%;
  min-width: 0;
  height: auto;
  margin: 0 auto;
}

.mermaid.is-error {
  min-height: 0;
  color: var(--color-claim);
  font-family: var(--font-mono);
  font-size: var(--text-small);
  white-space: pre-wrap;
}

.diagram-details {
  margin-top: var(--space-sm);
}

.diagram-details summary {
  cursor: pointer;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: var(--text-ui);
}

.diagram-details .diagram-source {
  margin-top: var(--space-sm);
}

.formula-block {
  overflow-x: auto;
  margin: var(--space-lg) 0;
  padding: var(--space-md);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  font-family: var(--font-mono);
}

.figure {
  margin: var(--space-xl) 0;
}

.figure img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}

.figure figcaption {
  margin-top: var(--space-sm);
  color: var(--color-muted);
  font-size: var(--text-small);
  line-height: 1.45;
}

.media-block {
  margin: var(--space-xl) 0;
}

.media-block audio,
.media-block video {
  display: block;
  width: 100%;
}

.media-block video {
  border-radius: var(--radius-sm);
}

.media-block figcaption {
  margin-top: var(--space-sm);
  color: var(--color-muted);
  font-size: var(--text-small);
  line-height: 1.45;
}

.media-player-list {
  display: grid;
  gap: var(--space-lg);
  margin: var(--space-lg) 0 var(--space-xl);
}

.published-media {
  margin: 0;
  padding: var(--space-md) 0;
  border-top: var(--border-subtle);
  border-bottom: var(--border-subtle);
}

.published-media + .published-media {
  border-top: 0;
}

.published-media audio,
.published-media video {
  display: block;
  width: 100%;
}

.published-media video {
  border-radius: var(--radius-sm);
  background: var(--color-surface);
}

.published-media figcaption {
  margin-top: var(--space-sm);
  color: var(--color-muted);
  font-size: var(--text-small);
  line-height: 1.45;
}

.published-media figcaption strong {
  display: block;
  color: var(--color-primary);
  font-weight: 460;
}

.published-media figcaption p {
  margin: var(--space-xs) 0 0;
  color: inherit;
  font-size: inherit;
  line-height: inherit;
}

.media-transcript {
  margin: var(--space-xl) 0 0;
}

.media-transcript h2 {
  color: var(--color-interface);
}

.meta,
.muted,
.meta-list dt,
.meta-list dd,
.item span {
  color: var(--color-muted);
  font-size: var(--text-small);
}

.section-path {
  margin-top: var(--space-xl);
  color: var(--color-primary);
}

.stat-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-md);
  margin: var(--space-lg) 0 var(--space-xl);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: var(--text-ui);
}

.stat-row span {
  display: inline-flex;
  gap: 5px;
  align-items: baseline;
}

.stat-row strong {
  color: var(--color-primary);
  font-weight: 520;
}

.stat-row [data-status],
.item-row [data-status] {
  color: var(--color-status);
}

.stat-row [data-status="seed"],
.item-row [data-status="seed"] {
  color: var(--color-faint);
}

.stat-row [data-status="published"],
.item-row [data-status="published"] {
  color: var(--color-definition);
}

.item-list {
  margin: var(--space-md) 0 var(--space-xl);
  padding: 0;
  list-style: none;
}

.item {
  margin: 0;
  padding: var(--space-md) 0;
  border-top: var(--border-subtle);
}

.item:last-child {
  border-bottom: var(--border-subtle);
}

.area-list {
  display: grid;
  gap: var(--space-lg);
}

.area-list .item {
  padding: 0;
  border-top: 0;
}

.area-list .item:last-child {
  border-bottom: 0;
}

.area-list .item-row span {
  flex: 0 0 auto;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: var(--text-ui);
}

.area-list .item[data-progress="started"] .item-row span {
  color: var(--color-status);
}

.area-list .item p {
  max-width: 640px;
}

.item[data-progress="empty"] a,
.item[data-progress="empty"] p {
  color: var(--color-muted);
}

.item[data-progress="empty"] span {
  color: var(--color-faint);
}

.item-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-md);
}

.item-row a {
  font-weight: 360;
}

.item p {
  margin: var(--space-sm) 0 0;
  color: var(--color-muted);
}

.anchor-groups {
  display: grid;
  gap: var(--space-xl);
  margin: var(--space-md) 0 var(--space-xl);
}

.anchor-group {
  min-width: 0;
}

.anchor-group-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: var(--border-subtle);
}

.anchor-group-header h3 {
  margin: 0;
}

.anchor-group-header span {
  flex: 0 0 auto;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: var(--text-ui);
}

.anchor-list {
  margin: var(--space-md) 0 var(--space-xl);
  padding: 0;
  list-style: none;
}

.anchor-list li {
  margin: 0;
  padding: var(--space-md) 0;
  border-top: var(--border-subtle);
}

.anchor-list li:last-child {
  border-bottom: var(--border-subtle);
}

.anchor-list p {
  margin: 0;
}

.anchor-list span {
  display: block;
  margin-top: var(--space-xs);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: var(--text-ui);
}

#source-anchors + ul {
  margin-top: var(--space-md);
  color: var(--color-muted);
  font-size: var(--text-small);
  line-height: 1.55;
}

#source-anchors + ul ul {
  margin-top: var(--space-sm);
  margin-bottom: var(--space-md);
}

#source-anchors + ul li {
  margin: 6px 0;
}

#source-anchors + ul code {
  padding: 0;
  background: transparent;
  color: var(--color-secondary);
  font-size: var(--text-ui);
}

#source-anchors + ul > li > code {
  color: var(--color-muted);
}

.source-page {
  color: var(--color-faint);
  font-family: var(--font-mono);
  font-size: var(--text-ui);
  white-space: nowrap;
}

.lesson-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  gap: var(--space-xl);
  max-width: var(--width-shell);
  margin: 0 auto var(--space-page);
  position: relative;
}

.lesson-shell.is-context-hidden {
  grid-template-columns: minmax(0, 1fr);
}

.lesson-shell.is-context-hidden .lesson-aside {
  display: none;
}

.lesson-toolbar {
  position: absolute;
  top: 0;
  right: 0;
  display: flex;
  justify-content: flex-end;
  color: var(--color-faint);
  font-family: var(--font-mono);
  font-size: var(--text-ui);
  line-height: var(--line-compact);
}

.context-toggle {
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  cursor: pointer;
  font: inherit;
}

.context-toggle:hover,
.context-toggle:focus-visible {
  color: var(--color-accent);
}

.context-toggle[aria-expanded="false"] {
  color: var(--color-primary);
}

.article-page {
  min-width: 0;
}

.artifact-tabs {
  display: none;
  gap: var(--space-xs);
  overflow-x: auto;
  margin: calc(var(--space-xl) * -0.35) 0 var(--space-xl);
  padding: 0 0 var(--space-sm);
  scrollbar-width: thin;
}

.lesson-shell.is-context-hidden .artifact-tabs {
  display: flex;
}

.artifact-tabs a {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  padding: 3px 7px;
  border: var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: var(--text-micro);
  text-decoration: none;
}

.artifact-tabs a[aria-current="page"] {
  border-color: var(--color-accent);
  color: var(--color-primary);
  background: var(--color-accent-soft);
}

.not-found-page a {
  text-decoration-line: underline;
  text-decoration-color: color-mix(in srgb, currentColor, transparent 58%);
}

.artifact-page[data-artifact-type="diagram"] h2 {
  color: var(--color-diagram);
}

.artifact-page[data-artifact-type="lab"] h2 {
  color: var(--color-practice);
}

.artifact-page[data-artifact-type="quiz"] h2,
.artifact-page[data-artifact-type="flashcards"] h2 {
  color: var(--color-claim);
}

.artifact-page[data-artifact-type="audio-script"] h2,
.artifact-page[data-artifact-type="video-script"] h2 {
  color: var(--color-interface);
}

.artifact-page[data-artifact-type="briefing"] h2,
.artifact-page[data-artifact-type="study-guide"] h2 {
  color: var(--color-representation);
}

.artifact-page[data-artifact-type="diagram"] .diagram-block {
  padding: 0;
}

.lab-step {
  margin: var(--space-xl) 0;
  padding: 0 0 0 var(--space-md);
  border-left: 2px solid var(--color-practice);
}

.lab-step h2 {
  margin-top: 0;
}

.lab-step pre {
  border-left: 0;
}

.artifact-page[data-artifact-type="quiz"] h2#questions + ol,
.artifact-page[data-artifact-type="quiz"] h2#answers + ol {
  padding-left: 0;
  list-style-position: inside;
}

.artifact-page[data-artifact-type="quiz"] h2#questions + ol li,
.artifact-page[data-artifact-type="quiz"] h2#answers + ol li {
  margin: var(--space-sm) 0;
  padding: var(--space-sm) 0;
  border-top: var(--border-subtle);
}

.artifact-page[data-artifact-type="quiz"] h2#answers + ol li {
  color: var(--color-muted);
}

.answer-key {
  margin: var(--space-xl) 0;
  padding-top: var(--space-md);
  border-top: var(--border-subtle);
}

.answer-key summary {
  cursor: pointer;
  color: var(--color-claim);
  font-family: var(--font-mono);
  font-size: var(--text-ui);
}

.answer-key h2 {
  margin-top: var(--space-lg);
}

.disclosure > summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: var(--text-ui);
  list-style: none;
}

.disclosure > summary::-webkit-details-marker {
  display: none;
}

.disclosure > summary::before {
  content: "+";
  width: 1ch;
  color: var(--color-faint);
}

.disclosure[open] > summary::before {
  content: "-";
}

.flashcard-grid {
  display: grid;
  margin: var(--space-lg) 0 var(--space-xl);
  border-top: var(--border-subtle);
  border-bottom: var(--border-subtle);
}

.flashcard {
  border-top: var(--border-subtle);
}

.flashcard:first-child {
  border-top: 0;
}

.flashcard summary {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr) 18px;
  gap: var(--space-md);
  align-items: baseline;
  padding: 12px 0;
  cursor: pointer;
  color: var(--color-primary);
  list-style: none;
}

.flashcard summary::-webkit-details-marker {
  display: none;
}

.flashcard summary::after {
  content: "+";
  justify-self: end;
  color: var(--color-faint);
  font-family: var(--font-mono);
  font-size: var(--text-ui);
}

.flashcard[open] summary::after {
  content: "-";
  color: var(--color-claim);
}

.flashcard-number {
  color: var(--color-faint);
  font-family: var(--font-mono);
  font-size: var(--text-ui);
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.flashcard-prompt {
  min-width: 0;
}

.flashcard-answer {
  margin: 0 0 var(--space-md) calc(32px + var(--space-md));
  padding-left: var(--space-md);
  border-left: 2px solid var(--color-claim);
  color: var(--color-muted);
  font-size: var(--text-small);
  line-height: 1.5;
}

.source-anchor-disclosure {
  margin: var(--space-xl) 0;
  padding-top: var(--space-md);
  border-top: var(--border-subtle);
}

.source-anchor-disclosure summary {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-muted);
}

.source-anchor-disclosure h2 {
  margin-top: var(--space-lg);
}

.artifact-page[data-artifact-type="audio-script"] p strong,
.artifact-page[data-artifact-type="video-script"] p strong {
  color: var(--color-interface);
  font-weight: 520;
}

.script-line {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: var(--space-md);
  margin: var(--space-sm) 0;
  padding: var(--space-sm) 0;
  border-top: var(--border-subtle);
}

.script-line strong {
  font-family: var(--font-mono);
  font-size: var(--text-ui);
}

.script-line span {
  color: var(--color-secondary);
}

.artifact-page[data-artifact-type="video-script"] table {
  display: block;
  overflow-x: auto;
  border-top: var(--border-subtle);
  border-bottom: var(--border-subtle);
}

.artifact-page[data-artifact-type="video-script"] th,
.artifact-page[data-artifact-type="video-script"] td {
  min-width: 120px;
  padding-right: var(--space-md);
}

.article-page > h1 + .meta-list {
  margin-top: var(--space-md);
}

.lesson-aside {
  padding-top: 3px;
}

.related-block {
  margin: 0;
}

.related-block h2 {
  margin: 0 0 var(--row-gap);
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--text-ui);
  font-weight: 420;
  line-height: var(--line-compact);
}

.related-context {
  margin-top: var(--space-lg);
}

.related-disclosure {
  padding: var(--row-gap) 0;
  border-top: var(--border-subtle);
}

.related-disclosure:last-child {
  border-bottom: var(--border-subtle);
}

.related-disclosure summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-md);
  color: var(--color-primary);
  font-weight: 420;
  line-height: var(--line-compact);
}

.related-disclosure summary span:first-child {
  flex: 1 1 auto;
}

.related-disclosure summary span:last-child {
  color: var(--color-faint);
  font-variant-numeric: tabular-nums;
  font-weight: 350;
}

.related-disclosure > :not(summary) {
  margin-top: var(--space-md);
}

.compact-list {
  display: grid;
  gap: var(--row-gap);
  margin: 0;
  padding: 0;
  list-style: none;
}

.compact-list li {
  position: relative;
  margin: 0;
  padding-left: var(--space-sm);
}

.compact-list a {
  display: block;
}

.compact-list a.artifact-link {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: var(--space-xs);
  align-items: baseline;
  line-height: var(--line-compact);
}

.lesson-aside .compact-list a {
  font-size: var(--text-ui);
  line-height: var(--line-compact);
}

.artifact-number {
  color: var(--color-faint);
  font-family: var(--font-mono);
  font-size: var(--text-micro);
  text-decoration: none;
}

.artifact-title {
  min-width: 0;
}

.compact-list li.is-current::before {
  content: "";
  position: absolute;
  top: 0.35em;
  bottom: 0.2em;
  left: 0;
  width: 2px;
  background: var(--color-accent);
}

.compact-list li.is-current a {
  color: var(--color-primary);
  text-decoration: none;
}

.semantic-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.semantic-list li {
  margin: 0 0 var(--space-md);
  padding-left: var(--space-sm);
  border-left: 2px solid var(--color-border);
}

.semantic-list span {
  display: block;
  margin-bottom: 1px;
  color: var(--color-faint);
  font-family: var(--font-mono);
  font-size: var(--text-micro);
}

.semantic-list strong {
  display: block;
  font-size: var(--text-ui);
  font-weight: 450;
}

.semantic-list p {
  margin: var(--space-xs) 0 0;
  color: var(--color-muted);
  font-size: var(--text-ui);
  line-height: 1.42;
}

.semantic-list [data-semantic-type="definition"] {
  border-left-color: var(--color-definition);
}

.semantic-list [data-semantic-type="definition"] span {
  color: var(--color-definition);
}

.semantic-list [data-semantic-type="claim"] {
  border-left-color: var(--color-claim);
}

.semantic-list [data-semantic-type="claim"] span {
  color: var(--color-claim);
}

.meta-list {
  display: grid;
  gap: var(--space-xs);
  margin: var(--space-lg) 0 var(--space-xl);
}

.meta-row {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: var(--space-sm);
}

.meta-list dt,
.meta-list dd {
  margin: 0;
  overflow-wrap: anywhere;
}

.meta-list dt {
  color: var(--color-faint);
  overflow-wrap: normal;
  white-space: nowrap;
}

.pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.pill {
  display: inline-flex;
  max-width: 100%;
  padding: 2px 6px;
  border: var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  font-size: var(--text-micro);
  line-height: 1.4;
  text-decoration: none;
}

.pill:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.pill[data-concept-tone="representation"] {
  border-color: color-mix(in srgb, var(--color-representation), transparent 70%);
  color: var(--color-representation);
}

.pill[data-concept-tone="system"] {
  border-color: color-mix(in srgb, var(--color-system), transparent 70%);
  color: var(--color-system);
}

.pill[data-concept-tone="interface"] {
  border-color: color-mix(in srgb, var(--color-interface), transparent 70%);
  color: var(--color-interface);
}

.pill[data-concept-tone="practice"] {
  border-color: color-mix(in srgb, var(--color-practice), transparent 70%);
  color: var(--color-practice);
}

body[data-section="graph"] {
  --concept: var(--color-muted);
  --graph-edge: color-mix(in srgb, var(--color-muted), transparent 68%);
  --graph-stage-background: color-mix(in srgb, var(--color-surface), transparent 44%);
}

body[data-section="graph"] .graph-page {
  max-width: var(--width-shell);
}

.graph-controls {
  display: grid;
  gap: var(--space-sm);
  margin: var(--space-xl) 0 var(--space-lg);
  padding: var(--space-md) 0;
  border-top: var(--border-subtle);
  border-bottom: var(--border-subtle);
}

.control-label {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: var(--text-ui);
}

.graph-controls select,
.graph-actions button,
.graph-detail .link-row {
  min-height: 36px;
  border: var(--border-control);
  border-radius: var(--radius-sm);
  background: var(--color-background);
  color: var(--color-primary);
  font-family: var(--font-body);
  font-size: var(--text-small);
  font-weight: inherit;
  line-height: 1.35;
}

.graph-controls select {
  width: 100%;
  padding: 0 var(--space-sm);
}

.graph-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

.graph-actions button,
.graph-detail .link-row {
  cursor: pointer;
}

.graph-actions button.active {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
  color: var(--color-primary);
}

.graph-actions button:focus-visible,
.graph-controls select:focus-visible,
.graph-detail .link-row:focus-visible {
  border-color: var(--color-accent);
}

.graph-stage {
  margin: var(--space-lg) 0 var(--space-xl);
}

#graph {
  display: block;
  width: 100%;
  height: min(62vh, 520px);
  min-height: 420px;
  border: var(--border-control);
  border-radius: var(--radius-sm);
  background:
    linear-gradient(color-mix(in srgb, var(--color-muted), transparent 94%) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--color-muted), transparent 94%) 1px, transparent 1px),
    var(--graph-stage-background);
  background-size: 36px 36px;
  cursor: grab;
  touch-action: none;
}

#graph.panning {
  cursor: grabbing;
}

.edge {
  stroke: var(--graph-edge);
  stroke-opacity: 0.52;
  stroke-width: 1.05;
}

.edge.is_a,
.edge.part_of {
  stroke-opacity: 0.34;
}

.edge.precedes {
  stroke-dasharray: 2 7;
  stroke-opacity: 0.22;
}

.edge.depends_on,
.edge.constrains,
.edge.interprets,
.edge.protects {
  stroke-dasharray: 3 5;
}

.node {
  cursor: pointer;
}

.node circle {
  stroke: var(--color-background);
  stroke-width: 2;
  filter: drop-shadow(0 2px 4px color-mix(in srgb, var(--color-primary), transparent 84%));
}

.node text {
  fill: var(--color-primary);
  font-size: 10px;
  paint-order: stroke;
  pointer-events: none;
  stroke: var(--color-background);
  stroke-width: 4px;
}

.node.hidden,
.edge.hidden {
  display: none;
}

.node.dim,
.edge.dim {
  opacity: 0.12;
}

.node.selected circle {
  stroke: var(--color-primary);
  stroke-width: 4;
}

.node:focus-visible {
  outline: none;
}

.node:focus-visible circle {
  stroke: var(--color-accent);
  stroke-width: 4;
}

.graph-detail {
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: var(--border-subtle);
}

.detail-type {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 0 7px;
  border-radius: var(--radius-sm);
  color: var(--color-background);
  font-family: var(--font-mono);
  font-size: var(--text-micro);
}

.graph-detail h2 {
  margin: var(--space-md) 0 var(--space-sm);
  font-size: var(--text-lede);
  line-height: 1.2;
}

.graph-detail p {
  margin: var(--space-sm) 0 0;
  color: var(--color-muted);
  font-size: var(--text-small);
  line-height: 1.5;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-md);
}

.chip {
  display: inline-flex;
  min-height: 24px;
  align-items: center;
  padding: 0 6px;
  border: var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: var(--text-micro);
}

.graph-detail .section {
  margin-top: var(--space-lg);
}

.graph-detail .section h3 {
  margin: 0 0 var(--space-sm);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: var(--text-ui);
  font-weight: 420;
}

.graph-detail .list {
  display: grid;
  gap: var(--space-sm);
}

.graph-detail .link-row {
  display: flex;
  width: 100%;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-sm);
  padding: var(--space-sm);
  text-align: left;
}

.graph-detail .link-row span:first-child,
.graph-detail .meta-row-top span:first-child {
  overflow-wrap: anywhere;
}

.graph-detail .link-row span:last-child,
.graph-detail .meta-row-top span:last-child {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: var(--text-micro);
  white-space: nowrap;
}

.graph-detail .meta-row {
  display: block;
  padding: var(--space-sm) 0;
  border-top: var(--border-subtle);
}

.graph-detail .meta-row:last-child {
  border-bottom: var(--border-subtle);
}

.graph-detail .meta-row-top {
  display: flex;
  justify-content: space-between;
  gap: var(--space-sm);
  font-size: var(--text-small);
  line-height: 1.4;
}

.graph-detail .meta-row code {
  display: block;
  margin-top: var(--space-xs);
  background: transparent;
  color: var(--color-faint);
  font-size: var(--text-micro);
  white-space: normal;
}

@media (max-width: 860px) {
  body {
    max-width: 680px;
  }

  .lesson-shell {
    display: block;
  }

  .lesson-toolbar {
    position: static;
    margin: 0 0 var(--space-md);
  }

  .lesson-aside {
    margin-top: var(--space-xl);
    padding-top: var(--space-xl);
    border-top: var(--border-subtle);
  }

  .artifact-tabs {
    display: flex;
    margin: var(--space-md) 0 var(--space-xl);
  }
}

@media (max-width: 560px) {
  body {
    min-width: 0;
    padding: calc(var(--space-lg) * 2) var(--space-lg);
  }

  .site-header,
  .item-row {
    display: block;
  }

  .meta-row {
    grid-template-columns: 64px minmax(0, 1fr);
  }

  .site-nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm) var(--space-md);
    margin-top: var(--space-sm);
  }

  .artifact-tabs {
    margin-bottom: var(--space-lg);
  }

  .artifact-tabs a {
    min-height: 28px;
    align-items: center;
  }

  .flashcard summary {
    grid-template-columns: 26px minmax(0, 1fr) 18px;
    gap: var(--space-sm);
  }

  .flashcard-answer {
    margin-left: calc(26px + var(--space-sm));
  }

  .anchor-group-header {
    display: block;
  }

  .anchor-group-header span {
    display: block;
    margin-top: var(--space-xs);
  }

  #graph {
    height: 440px;
    min-height: 360px;
  }

  .item-row span {
    display: block;
    margin-top: var(--space-xs);
  }
}