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

html {
  background: var(--ontology-canvas);
  font-synthesis: none;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--ontology-header) + 24px);
}

body {
  margin: 0;
  background: var(--ontology-canvas);
  color: var(--ontology-ink);
  font-family: var(--ontology-text);
  font-size: 1rem;
  font-weight: var(--ontology-body-weight);
  line-height: 1.55;
  overflow-x: clip;
  transition: background-color var(--ontology-theme) var(--ontology-ease), color var(--ontology-theme) var(--ontology-ease);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.index-open {
  overflow: hidden;
}

a {
  color: inherit;
}

button,
input,
textarea,
select {
  color: inherit;
  font: inherit;
}

button {
  border: 0;
}

img,
svg,
video {
  display: block;
  max-width: 100%;
}

img,
video {
  height: auto;
  object-fit: contain;
  object-position: center;
}

h1,
h2,
h3,
p,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
}

::selection {
  background: var(--ontology-signal);
  color: var(--ontology-black);
}

:focus-visible {
  outline: 2px solid var(--ontology-signal);
  outline-offset: 4px;
}

.skip-link {
  background: var(--ontology-signal);
  color: var(--ontology-black);
  font-family: var(--ontology-mono);
  font-size: 0.72rem;
  font-weight: 500;
  left: 12px;
  letter-spacing: 0.14em;
  padding: 12px 16px;
  position: fixed;
  text-transform: uppercase;
  top: 12px;
  transform: translateY(-160%);
  transition: transform var(--ontology-fast) var(--ontology-ease);
  z-index: 1000;
}

.skip-link:focus {
  transform: translateY(0);
}

.frame {
  margin-inline: auto;
  max-width: var(--ontology-frame);
  padding-inline: var(--ontology-pad);
  width: 100%;
}

.reading {
  margin-inline: auto;
  max-width: var(--ontology-reading);
}

.spaced {
  margin-top: 64px;
}

.visually-hidden {
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  height: 1px;
  overflow: hidden;
  position: absolute;
  white-space: nowrap;
  width: 1px;
}

.mono,
.eyebrow,
.label,
.micro,
.route,
.token-name,
.spec-caption {
  font-family: var(--ontology-mono);
  font-weight: 500;
  text-transform: uppercase;
}

.eyebrow,
.label {
  font-size: var(--ontology-label-size);
  letter-spacing: var(--ontology-label-tracking);
  line-height: var(--ontology-label-leading);
}

.micro {
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  line-height: 1.45;
}

.signal {
  background: var(--ontology-signal);
  display: inline-block;
  flex: 0 0 auto;
  height: 7px;
  width: 7px;
}

.signal-outline {
  background: transparent;
  border: 1px solid var(--ontology-signal);
}

.site-header {
  background: color-mix(in srgb, var(--ontology-canvas) 94%, transparent);
  border-bottom: 1px solid var(--ontology-rule);
  height: var(--ontology-header);
  inset: 0 0 auto;
  position: sticky;
  top: 0;
  transition: background-color var(--ontology-theme) var(--ontology-ease), border-color var(--ontology-theme) var(--ontology-ease);
  z-index: 100;
}

.site-header .frame {
  align-items: center;
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto minmax(220px, 1fr);
  height: 100%;
}

.site-brand {
  align-items: center;
  display: inline-grid;
  gap: 3px;
  justify-self: start;
  line-height: 1;
  text-decoration: none;
}

.site-brand strong {
  font-family: var(--ontology-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.site-brand small {
  color: var(--ontology-faint);
  font-family: var(--ontology-mono);
  font-size: 0.52rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.current-route {
  align-items: center;
  display: flex;
  gap: 12px;
  justify-self: center;
}

.current-route .route {
  font-size: 0.64rem;
  letter-spacing: 0.18em;
}

.header-actions {
  align-items: center;
  display: flex;
  gap: 22px;
  justify-self: end;
}

.bsd {
  color: var(--ontology-faint);
  font-family: var(--ontology-mono);
  font-weight: 500;
  font-size: 0.62rem;
  letter-spacing: 0.1em;
}

.theme-toggle,
.index-summary {
  align-items: center;
  background: transparent;
  color: var(--ontology-ink);
  cursor: pointer;
  display: inline-flex;
  font-family: var(--ontology-mono);
  font-size: 0.62rem;
  font-weight: 500;
  gap: 9px;
  letter-spacing: 0.12em;
  min-height: 38px;
  padding: 0;
  text-transform: uppercase;
}

.theme-glyph {
  border: 1px solid currentColor;
  height: 12px;
  position: relative;
  width: 12px;
}

.theme-glyph::after {
  background: currentColor;
  content: "";
  inset: 0 50% 0 0;
  position: absolute;
}

.system-index {
  position: static;
}

.index-summary {
  list-style: none;
}

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

.index-summary::after {
  content: "+";
  font-family: var(--ontology-mono);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1;
}

.system-index[open] .index-summary::after {
  content: "−";
}

.index-panel {
  background: var(--ontology-canvas);
  border-bottom: 1px solid var(--ontology-rule-strong);
  border-left: 1px solid var(--ontology-rule-strong);
  max-height: calc(100svh - var(--ontology-header));
  overflow-y: auto;
  padding: 48px;
  position: fixed;
  right: 0;
  top: var(--ontology-header);
  transition: background-color var(--ontology-theme) var(--ontology-ease);
  width: min(620px, 100vw);
  z-index: 120;
}

.system-index:not([open]) .index-panel {
  display: none;
}

.index-intro {
  border-bottom: 1px solid var(--ontology-rule);
  display: flex;
  justify-content: space-between;
  margin-bottom: 32px;
  padding-bottom: 22px;
}

.index-intro p:last-child {
  color: var(--ontology-faint);
}

.index-groups {
  display: grid;
  gap: 36px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.index-group h2 {
  color: var(--ontology-faint);
  font-family: var(--ontology-mono);
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  margin-bottom: 14px;
  text-transform: uppercase;
}

.index-group a {
  align-items: baseline;
  border-top: 1px solid var(--ontology-rule);
  display: grid;
  gap: 10px;
  grid-template-columns: 20px 1fr;
  padding: 12px 0;
  text-decoration: none;
}

.index-group a span:first-child {
  color: var(--ontology-faint);
  font-family: var(--ontology-mono);
  font-size: 0.58rem;
  font-weight: 500;
}

.index-group a span:last-child {
  font-size: 0.86rem;
  font-weight: 400;
}

.index-group a[aria-current="page"] span:last-child,
.index-group a:hover span:last-child {
  color: var(--ontology-signal-text);
}

.site-sidebar {
  display: none;
}

.page-hero {
  border-bottom: 1px solid var(--ontology-rule);
  min-height: min(780px, calc(100svh - var(--ontology-header)));
  padding-block: 96px 80px;
}

.page-hero .frame {
  display: flex;
  flex-direction: column;
  min-height: calc(min(780px, 100svh - var(--ontology-header)) - 176px);
}

.hero-label {
  align-items: center;
  color: var(--ontology-faint);
  display: flex;
  gap: 14px;
}

.hero-title {
  font-size: var(--ontology-display-size);
  font-weight: var(--ontology-display-weight);
  letter-spacing: var(--ontology-display-tracking);
  line-height: var(--ontology-display-leading);
  margin-top: auto;
  max-width: 12ch;
  text-wrap: balance;
}

.hero-title.monument {
  font-size: var(--ontology-monument-size);
  font-weight: var(--ontology-monument-weight);
  letter-spacing: var(--ontology-monument-tracking);
  line-height: var(--ontology-monument-leading);
  max-width: none;
  text-transform: uppercase;
}

.hero-answer {
  align-self: flex-end;
  border-top: 1px solid var(--ontology-rule-strong);
  color: var(--ontology-ink-2);
  font-size: clamp(1.35rem, 2.2vw, 2.1rem);
  font-weight: var(--ontology-lede-weight);
  letter-spacing: -0.02em;
  line-height: 1.32;
  margin-top: 72px;
  max-width: 36ch;
  padding-top: 24px;
}

.hero-ledger {
  border-top: 1px solid var(--ontology-rule);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 72px;
}

.hero-ledger div {
  min-width: 0;
  padding: 18px 20px 0 0;
}

.hero-ledger div + div {
  border-left: 1px solid var(--ontology-rule);
  padding-left: 20px;
}

.hero-ledger dt {
  color: var(--ontology-faint);
  font-family: var(--ontology-mono);
  font-size: 0.58rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  margin-bottom: 8px;
  text-transform: uppercase;
}

.hero-ledger dd {
  font-size: 0.9rem;
  font-weight: 400;
}

.content-section {
  border-bottom: 1px solid var(--ontology-rule);
  padding-block: 112px;
}

.content-section.compact {
  padding-block: 80px;
}

.section-head {
  display: grid;
  gap: 48px;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  margin-bottom: 72px;
}

.section-index {
  color: var(--ontology-faint);
  grid-column: span 3;
}

.section-heading {
  grid-column: span 9;
}

.section-heading h2 {
  font-size: var(--ontology-headline-size);
  font-weight: var(--ontology-headline-weight);
  letter-spacing: var(--ontology-headline-tracking);
  line-height: var(--ontology-headline-leading);
  max-width: 18ch;
  text-wrap: balance;
}

.section-heading p {
  color: var(--ontology-ink-2);
  font-size: var(--ontology-body-size);
  line-height: var(--ontology-body-leading);
  margin-top: 24px;
  max-width: 54ch;
}

.statement {
  font-size: clamp(2.7rem, 5vw, 5rem);
  font-weight: var(--ontology-display-weight);
  letter-spacing: -0.052em;
  line-height: 0.98;
  max-width: 15ch;
  text-wrap: balance;
}

.lede {
  color: var(--ontology-ink-2);
  font-size: var(--ontology-body-size);
  line-height: var(--ontology-body-leading);
  max-width: 58ch;
}

.rule-list {
  border-top: 1px solid var(--ontology-rule-strong);
  list-style: none;
}

.rule-list li {
  align-items: baseline;
  border-bottom: 1px solid var(--ontology-rule);
  display: grid;
  gap: 24px;
  grid-template-columns: 42px minmax(0, 1fr) minmax(220px, 0.7fr);
  padding-block: 24px;
}

.rule-list .number {
  color: var(--ontology-faint);
  font-family: var(--ontology-mono);
  font-size: 0.65rem;
  font-weight: 500;
}

.rule-list h3 {
  font-size: 1.28rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

.rule-list p {
  color: var(--ontology-ink-2);
  font-size: 0.95rem;
  line-height: 1.55;
}

.two-up,
.three-up,
.four-up {
  display: grid;
}

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

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

.four-up {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.divided > * {
  border-top: 1px solid var(--ontology-rule);
  min-width: 0;
  padding: 30px 32px 34px 0;
}

.divided > * + * {
  border-left: 1px solid var(--ontology-rule);
  padding-left: 32px;
}

.divided h3 {
  font-size: 1.22rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin-top: 18px;
}

.divided p {
  color: var(--ontology-ink-2);
  margin-top: 10px;
}

.paper-field {
  --ontology-canvas: var(--ontology-paper);
  --ontology-canvas-2: var(--ontology-ghost);
  --ontology-ink: var(--ontology-black);
  --ontology-ink-2: var(--ontology-paper-ink-2);
  --ontology-faint: var(--ontology-paper-faint-readable);
  --ontology-rule: var(--ontology-paper-rule);
  --ontology-rule-strong: rgba(5, 5, 5, 0.32);
  --ontology-signal-text: #006b4f;
  background: var(--ontology-paper);
  color: var(--ontology-black);
}

.dark-field {
  --ontology-canvas: var(--ontology-black);
  --ontology-canvas-2: #0a0a0a;
  --ontology-ink: var(--ontology-carbon-ink);
  --ontology-ink-2: var(--ontology-carbon-2);
  --ontology-faint: rgba(246, 246, 241, 0.56);
  --ontology-rule: rgba(246, 246, 241, 0.1);
  --ontology-rule-strong: rgba(246, 246, 241, 0.2);
  --ontology-signal-text: var(--ontology-signal);
  background: var(--ontology-black);
  color: var(--ontology-carbon-ink);
}

.signal-text {
  color: var(--ontology-signal-text) !important;
}

.status-line {
  align-items: center;
  display: inline-flex;
  gap: 10px;
}

.code-field {
  background: var(--ontology-canvas-2);
  border: 1px solid var(--ontology-rule);
  color: var(--ontology-ink-2);
  font-family: var(--ontology-mono);
  font-weight: 500;
  font-size: 0.76rem;
  line-height: 1.7;
  overflow-x: auto;
  padding: 28px;
  tab-size: 2;
  white-space: pre;
}

.code-field .key {
  color: var(--ontology-ink);
}

code,
.code-field {
  font-family: var(--ontology-mono);
  font-weight: 400;
}

.code-field .value {
  color: var(--ontology-signal-text);
}

.site-footer {
  min-height: 96px;
  padding-block: 30px;
}

.site-footer .frame {
  align-items: center;
  color: var(--ontology-faint);
  display: flex;
  flex-wrap: wrap;
  font-family: var(--ontology-mono);
  font-size: 0.58rem;
  font-weight: 500;
  gap: 16px 32px;
  justify-content: space-between;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.source-note {
  border-top: 1px solid var(--ontology-rule);
  color: var(--ontology-faint);
  font-size: 0.8rem;
  line-height: 1.6;
  margin-top: 56px;
  padding-top: 20px;
}

.source-note a {
  text-underline-offset: 3px;
}

[data-reveal] {
  opacity: 1;
  transform: none;
}

@media (min-width: 1101px) {
  .site-header::after {
    background: var(--ontology-rule);
    bottom: 0;
    content: "";
    left: var(--ontology-sidebar);
    position: absolute;
    top: 0;
    width: 1px;
  }

  .site-header .frame {
    grid-template-columns: calc(var(--ontology-sidebar) + var(--ontology-pad) - 28px) minmax(0, 1fr);
    max-width: none;
    padding-left: 28px;
    padding-right: var(--ontology-pad);
    position: relative;
  }

  .current-route {
    grid-column: 2;
  }

  .header-actions {
    position: absolute;
    right: var(--ontology-pad);
  }

  .system-index {
    display: none;
  }

  .site-sidebar {
    background: var(--ontology-canvas);
    border-right: 1px solid var(--ontology-rule);
    bottom: 0;
    display: flex;
    flex-direction: column;
    left: 0;
    overscroll-behavior: contain;
    overflow-y: auto;
    scrollbar-gutter: stable;
    padding: 42px 28px 28px;
    position: fixed;
    top: var(--ontology-header);
    transition: background-color var(--ontology-theme) var(--ontology-ease), border-color var(--ontology-theme) var(--ontology-ease);
    width: var(--ontology-sidebar);
    z-index: 80;
  }

  .sidebar-intro {
    border-bottom: 1px solid var(--ontology-rule);
    margin-bottom: 30px;
    padding-bottom: 18px;
  }

  .sidebar-intro p:first-child {
    color: var(--ontology-ink);
  }

  .sidebar-intro p:last-child {
    color: var(--ontology-faint);
    margin-top: 5px;
  }

  .sidebar-nav {
    display: grid;
    gap: 22px;
  }

  .sidebar-group h2 {
    color: var(--ontology-faint);
    font-family: var(--ontology-mono);
    font-size: 0.56rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    margin: 0 0 9px;
    text-transform: uppercase;
  }

  .sidebar-group a {
    align-items: center;
    border-top: 1px solid var(--ontology-rule);
    display: grid;
    gap: 10px;
    grid-template-columns: 7px 20px minmax(0, 1fr);
    min-height: 34px;
    padding: 7px 0;
    text-decoration: none;
  }

  .sidebar-group a::before {
    background: transparent;
    content: "";
    height: 7px;
    width: 7px;
  }

  .sidebar-group a[aria-current="page"]::before {
    background: var(--ontology-signal);
  }

  .sidebar-group a span:first-child {
    color: var(--ontology-faint);
    font-family: var(--ontology-mono);
    font-size: 0.55rem;
    font-weight: 500;
  }

  .sidebar-group a span:last-child {
    font-size: 0.82rem;
    font-weight: 400;
  }

  .sidebar-group a:hover span:last-child,
  .sidebar-group a:focus-visible span:last-child,
  .sidebar-group a[aria-current="page"] span:last-child {
    color: var(--ontology-ink);
  }

  .sidebar-group a[aria-current="page"] span:last-child {
    font-weight: 500;
  }

  .sidebar-status {
    border-top: 1px solid var(--ontology-rule);
    color: var(--ontology-faint);
    display: grid;
    gap: 6px;
    margin-top: auto;
    padding-top: 18px;
  }

  main,
  .site-footer {
    margin-left: var(--ontology-sidebar);
  }
}

@media (min-width: 1101px) and (max-width: 1279px) {
  :root {
    --ontology-pad: 48px;
  }

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

  .four-up.divided > *:nth-child(3) {
    border-left: 0;
  }

  .section-index {
    grid-column: span 2;
  }

  .section-heading {
    grid-column: span 10;
  }
}

.motion-ready [data-reveal] {
  opacity: 1;
  transform: translateY(14px);
  transition: transform var(--ontology-entry-fast) var(--ontology-ease);
}

.motion-ready [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 1100px) {
  .site-header .frame {
    grid-template-columns: 1fr auto;
  }

  .current-route,
  .bsd {
    display: none;
  }

  .hero-title.monument {
    font-size: clamp(5rem, 13.2vw, 9rem);
  }

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

  .four-up.divided > *:nth-child(3) {
    border-left: 0;
  }

  .section-index {
    grid-column: span 2;
  }

  .section-heading {
    grid-column: span 10;
  }
}

@media (max-width: 767px) {
  .site-header {
    height: 64px;
  }

  :root {
    --ontology-header: 64px;
  }

  .site-brand small,
  .theme-label {
    display: none;
  }

  .header-actions {
    gap: 16px;
  }

  .index-panel {
    border-left: 0;
    min-height: calc(100svh - var(--ontology-header));
    padding: 30px 24px 48px;
    width: 100%;
  }

  .index-groups {
    gap: 32px;
    grid-template-columns: 1fr;
  }

  .page-hero {
    min-height: auto;
    padding-block: 72px 56px;
  }

  .page-hero .frame {
    min-height: 560px;
  }

  .hero-title,
  .hero-title.monument {
    margin-top: 100px;
  }

  .hero-title.monument {
    font-size: clamp(4.4rem, 18vw, 6rem);
    line-height: 0.84;
  }

  .hero-answer {
    align-self: stretch;
    font-size: 1.28rem;
    margin-top: auto;
  }

  .hero-ledger {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 48px;
  }

  .hero-ledger div:nth-child(3) {
    border-left: 0;
  }

  .hero-ledger div:nth-child(n + 3) {
    border-top: 1px solid var(--ontology-rule);
    margin-top: 18px;
    padding-top: 18px;
  }

  .content-section,
  .content-section.compact {
    padding-block: 72px;
  }

  .section-head {
    gap: 20px;
    grid-template-columns: 1fr;
    margin-bottom: 48px;
  }

  .section-index,
  .section-heading {
    grid-column: auto;
  }

  .section-heading h2 {
    font-size: clamp(2.35rem, 10vw, 3.3rem);
  }

  .two-up,
  .three-up,
  .four-up {
    grid-template-columns: 1fr;
  }

  .divided > *,
  .divided > * + *,
  .four-up.divided > *:nth-child(3) {
    border-left: 0;
    padding-left: 0;
    padding-right: 0;
  }

  .rule-list li {
    gap: 12px 16px;
    grid-template-columns: 28px minmax(0, 1fr);
  }

  .rule-list p {
    grid-column: 2;
  }

}

@media (max-width: 359px) {
  .hero-title.long-title {
    font-size: clamp(3.45rem, 15vw, 4.2rem);
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .motion-ready [data-reveal] {
    opacity: 1;
    transform: none;
  }
}