@import url("https://use.typekit.net/rhw6amk.css");

:root {
  --background: #fff;
  --ink: #111;
  --muted: #595959;
  --line: #d8d8d8;
  --soft-line: #eee;
  --hover: #fafafa;
  --font-sans: "indivisible-variable", ui-sans-serif, system-ui, sans-serif;
  --font-mono: "config-mono-vf", ui-monospace, monospace;
  --page-pad: clamp(1.25rem, 3.5vw, 3rem);
  --section-gap: clamp(1.5rem, 4vw, 3rem);
  --content-max: 90rem;
  --measure: 58rem;
  --narrow-measure: 48rem;
  --label-size: clamp(0.75rem, 0.8vw, 0.86rem);
  --body-size: clamp(1rem, 1.05vw, 1.14rem);
  --lede-size: clamp(1.2rem, 2vw, 1.62rem);
  --title-size: clamp(2.35rem, 5.6vw, 5.65rem);
  --page-title-size: clamp(2.25rem, 5vw, 4.8rem);
  --section-title-size: clamp(1.75rem, 3.1vw, 3rem);
  --record-title-size: clamp(1.4rem, 2.3vw, 2.2rem);
  --duration: 180ms;
  --theme-crossfade-duration: 180ms;
  --theme-background-duration: 220ms;
  --theme-foreground-duration: 1ms;
  --theme-foreground-delay: 110ms;

  color-scheme: light;
}

:root[data-theme="dark"] {
  --background: #181715;
  --ink: #f1eee8;
  --muted: #b9b3aa;
  --line: #59544c;
  --soft-line: #2b2925;
  --hover: #211f1c;

  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

@media (prefers-reduced-motion: no-preference) {
  :root[data-theme-switching="view"]::view-transition-old(root),
  :root[data-theme-switching="view"]::view-transition-new(root),
  :root[data-theme-switching="view"]::view-transition-group(root) {
    animation-duration: var(--theme-crossfade-duration);
    animation-timing-function: ease;
  }

  :root[data-theme-switching="fallback"],
  :root[data-theme-switching="fallback"] *,
  :root[data-theme-switching="fallback"] *::before,
  :root[data-theme-switching="fallback"] *::after,
  :root[data-theme-switching="fallback"] .diagram-lightbox::backdrop {
    transition-property: background-color, border-color, box-shadow, color, fill, stroke;
    transition-duration:
      var(--theme-background-duration),
      var(--theme-background-duration),
      var(--theme-background-duration),
      var(--theme-foreground-duration),
      var(--theme-foreground-duration),
      var(--theme-foreground-duration);
    transition-delay:
      0ms,
      0ms,
      0ms,
      var(--theme-foreground-delay),
      var(--theme-foreground-delay),
      var(--theme-foreground-delay);
    transition-timing-function: ease, ease, ease, ease, ease, ease;
  }
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  background: var(--background);
  color: var(--ink);
  font-family: var(--font-sans);
}

body {
  min-inline-size: 320px;
  margin: 0;
  background: var(--background);
  color: var(--ink);
}

body,
button {
  font: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  inset-block-start: 0.75rem;
  inset-inline-start: 0.75rem;
  z-index: 30;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--ink);
  background: var(--background);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: var(--label-size);
  transform: translateY(-200%);
}

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

.site-header {
  position: sticky;
  inset-block-start: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 1rem;
  padding-block: 1rem;
  padding-inline: var(--page-pad);
  border-block-end: 1px solid var(--soft-line);
  background: color-mix(in srgb, var(--background) 96%, transparent);
  backdrop-filter: blur(12px);
}

.brand {
  justify-self: start;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 520;
  line-height: 1;
}

.menu-panel {
  position: static;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.75rem;
  min-inline-size: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 430;
  line-height: 1;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  block-size: 2rem;
  border-block-end: 1px solid transparent;
  transition:
    color var(--duration) ease,
    border-color var(--duration) ease;
}

.nav-links a:hover,
.nav-links a:focus-visible,
.nav-links a[aria-current="page"] {
  color: var(--ink);
  border-block-end-color: currentcolor;
}

.header-actions {
  display: flex;
  align-items: center;
  justify-self: end;
  gap: 0.25rem;
}

.contact-links {
  display: flex;
  align-items: center;
  gap: 0.2rem;
}

.contact-links--menu {
  display: flex;
  padding-inline-start: 0.55rem;
  border-inline-start: 1px solid var(--soft-line);
}

.contact-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  inline-size: 1.8rem;
  block-size: 2rem;
  color: var(--muted);
  line-height: 0;
  transition:
    color var(--duration) ease,
    transform var(--duration) ease;
}

.contact-link:hover,
.contact-link:focus-visible {
  color: var(--ink);
}

.contact-link:active {
  transform: none;
}

.contact-link svg {
  inline-size: 1rem;
  block-size: 1rem;
  overflow: visible;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  gap: 0;
  inline-size: 1.8rem;
  block-size: 2rem;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  line-height: 0;
}

.theme-toggle svg {
  inline-size: 1rem;
  block-size: 1rem;
  overflow: visible;
}

.theme-toggle__icon--sun {
  display: none;
}

:root[data-theme="dark"] .theme-toggle__icon--sun {
  display: block;
}

:root[data-theme="dark"] .theme-toggle__icon--moon {
  display: none;
}

.menu-toggle {
  display: none;
  place-items: center;
  inline-size: 2rem;
  min-block-size: 2rem;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}

.menu-toggle__icon {
  position: relative;
  display: block;
  inline-size: 1.1rem;
  block-size: 0.8rem;
}

.menu-toggle__icon::before,
.menu-toggle__icon::after {
  position: absolute;
  inset-inline: 0;
  block-size: 1px;
  background: currentcolor;
  content: "";
  transition:
    inset-block-start var(--duration) ease,
    transform var(--duration) ease;
}

.menu-toggle__icon::before {
  inset-block-start: 0.15rem;
}

.menu-toggle__icon::after {
  inset-block-start: 0.65rem;
}

.menu-toggle[aria-expanded="true"] .menu-toggle__icon::before,
.menu-toggle[aria-expanded="true"] .menu-toggle__icon::after {
  inset-block-start: 0.4rem;
}

.menu-toggle[aria-expanded="true"] .menu-toggle__icon::before {
  transform: rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle__icon::after {
  transform: rotate(-45deg);
}

main {
  inline-size: min(100%, var(--content-max));
  margin-inline: auto;
  padding-inline: var(--page-pad);
}

.section-grid {
  display: grid;
  grid-template-columns: minmax(9rem, 0.22fr) minmax(0, 1fr);
  align-items: start;
  gap: var(--section-gap);
  padding-block: clamp(2.8rem, 6vw, 5.4rem);
  border-block-end: 1px solid var(--line);
}

.section-label,
.status-line,
.field-label,
.caption,
.meta-line,
.result-label,
.status-key dt,
.record-status,
.source-kicker {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: var(--label-size);
  line-height: 1.35;
}

.section-label {
  padding-block-start: 0;
  text-transform: uppercase;
}

.hero {
  min-block-size: calc(100svh - 3.75rem);
  align-content: center;
  border-block-end-color: var(--ink);
}

.page-hero {
  min-block-size: min(44rem, calc(82svh - 3.75rem));
  align-content: center;
  border-block-end-color: var(--ink);
}

.hero-main {
  padding-block: 0;
}

h1,
h2,
h3,
p,
blockquote {
  margin-block-start: 0;
}

h1,
h2,
h3 {
  text-wrap: balance;
}

h1 {
  max-inline-size: 16.5ch;
  margin-block-end: clamp(1.35rem, 3vw, 2rem);
  font-size: var(--title-size);
  font-weight: 430;
  letter-spacing: 0;
  line-height: 0.95;
}

.page-hero h1 {
  max-inline-size: 16ch;
  font-size: var(--page-title-size);
  line-height: 0.98;
}

h2 {
  max-inline-size: 20ch;
  margin-block-end: 1rem;
  font-size: var(--section-title-size);
  font-weight: 500;
  letter-spacing: 0;
  line-height: 1.04;
}

h3 {
  margin-block-end: 0.65rem;
  font-size: var(--record-title-size);
  font-weight: 510;
  line-height: 1.08;
}

p {
  max-inline-size: var(--measure);
  font-size: var(--body-size);
  line-height: 1.58;
}

p + p {
  margin-block-start: 1rem;
}

code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  white-space: nowrap;
}

.nowrap {
  white-space: nowrap;
}

.hero-lede {
  max-inline-size: 43rem;
  color: var(--muted);
  font-size: var(--lede-size);
  line-height: 1.3;
}

.byline {
  max-inline-size: 43rem;
  margin-block-start: 1.25rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: clamp(0.86rem, 0.9vw, 0.98rem);
  line-height: 1.45;
}

.byline a,
.inline-link {
  border-block-end: 1px solid currentcolor;
  color: var(--ink);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  margin-block-start: 2rem;
}

.text-link,
.source-link {
  display: inline-flex;
  align-items: center;
  min-block-size: 1.75rem;
  border-block-end: 1px solid currentcolor;
  color: var(--ink);
  line-height: 1.25;
}

.text-link {
  font-size: var(--body-size);
  transition:
    color var(--duration) ease,
    border-color var(--duration) ease,
    box-shadow var(--duration) ease,
    transform var(--duration) ease;
}

.source-link {
  font-family: var(--font-mono);
  font-size: var(--label-size);
}

.text-link--muted {
  color: var(--muted);
}

.text-link:hover,
.text-link:focus-visible,
.source-link:hover,
.source-link:focus-visible,
.inline-link:hover,
.inline-link:focus-visible,
.byline a:hover,
.byline a:focus-visible {
  color: var(--muted);
}

.text-link:hover,
.text-link:focus-visible {
  color: var(--ink);
  box-shadow: 0 1px 0 currentcolor;
  transform: translateY(-2px);
}

.text-link:active {
  box-shadow: none;
  transform: translateY(1px);
}

.section-intro {
  max-inline-size: var(--narrow-measure);
  color: var(--muted);
  font-size: var(--lede-size);
  line-height: 1.35;
}

.status-line,
.meta-line,
.record-status,
.source-kicker {
  margin-block-end: 0.85rem;
  text-transform: uppercase;
}

.research-list,
.result-list,
.definition-list,
.source-list,
.status-key,
.principle-list {
  display: grid;
  gap: 0;
  margin-block-start: clamp(1.75rem, 3vw, 2.5rem);
  border-block-start: 1px solid var(--line);
}

.research-list > a,
.result-row,
.definition-row,
.source-row,
.status-key > div,
.principle-row {
  display: grid;
  gap: 1.25rem;
  padding-block: 1.15rem;
  border-block-end: 1px solid var(--line);
}

.research-list > a {
  grid-template-columns: minmax(14rem, 0.36fr) minmax(0, 1fr) minmax(7rem, auto);
  align-items: start;
}

.research-list > a:hover,
.research-list > a:focus-visible {
  background: var(--hover);
}

.research-list h3,
.research-list p {
  margin: 0;
}

.research-list p {
  color: var(--muted);
}

.research-list .record-status {
  margin: 0;
  text-align: end;
}

.flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  margin-block-start: clamp(1.75rem, 3vw, 2.5rem);
  border-block-start: 1px solid var(--line);
  border-inline-start: 1px solid var(--line);
}

.flow > div {
  position: relative;
  min-block-size: 9rem;
  padding: 1rem;
  border-inline-end: 1px solid var(--line);
  border-block-end: 1px solid var(--line);
  font-size: clamp(1rem, 1.2vw, 1.2rem);
  line-height: 1.28;
}

.flow > div:not(:last-child)::after {
  position: absolute;
  inset-block-start: 50%;
  inset-inline-end: -0.4rem;
  z-index: 1;
  inline-size: 0.72rem;
  block-size: 0.72rem;
  border-block-start: 1px solid var(--ink);
  border-inline-end: 1px solid var(--ink);
  background: var(--background);
  content: "";
  transform: translateY(-50%) rotate(45deg);
}

.caption {
  max-inline-size: var(--narrow-measure);
  margin-block-start: 1rem;
}

.evidence-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  margin-block-start: clamp(1.75rem, 3vw, 2.5rem);
  border-block-start: 1px solid var(--line);
  border-inline-start: 1px solid var(--line);
}

.evidence-grid > div {
  display: grid;
  align-content: start;
  gap: 0.7rem;
  min-block-size: 13rem;
  padding: 1rem;
  border-inline-end: 1px solid var(--line);
  border-block-end: 1px solid var(--line);
}

.evidence-grid dt,
.evidence-grid dd {
  margin: 0;
}

.evidence-grid dd {
  font-size: clamp(1.45rem, 2.4vw, 2.35rem);
  font-weight: 520;
  line-height: 1.05;
}

.evidence-grid p {
  margin: 0;
  color: var(--muted);
  font-size: clamp(0.92rem, 1vw, 1.02rem);
  line-height: 1.45;
}

.boundary-statement {
  max-inline-size: 35ch;
  margin-block: 0;
  font-size: clamp(1.65rem, 3vw, 2.8rem);
  font-weight: 450;
  line-height: 1.12;
}

.callout {
  max-inline-size: var(--measure);
  margin-block-start: 1.75rem;
  padding-block: 1rem;
  border-block: 1px solid var(--line);
}

.callout p {
  margin: 0;
}

.outcome-list,
.plain-list {
  display: grid;
  gap: 0.65rem;
  max-inline-size: var(--measure);
  margin: 1.5rem 0 0;
  padding-inline-start: 1.15rem;
  color: var(--muted);
  font-size: var(--body-size);
  line-height: 1.5;
}

.outcome-list li::marker,
.plain-list li::marker {
  color: var(--ink);
}

.link-row {
  margin-block-start: 1.75rem;
}

.next-links {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  margin-block-start: clamp(1.75rem, 3vw, 2.5rem);
  border-block-start: 1px solid var(--line);
  border-inline-start: 1px solid var(--line);
}

.next-links a {
  min-block-size: 11rem;
  padding: 1rem;
  border-inline-end: 1px solid var(--line);
  border-block-end: 1px solid var(--line);
}

.next-links a:hover,
.next-links a:focus-visible {
  background: var(--hover);
}

.next-links span {
  display: block;
  margin-block-end: 0.65rem;
  font-size: clamp(1.15rem, 1.6vw, 1.45rem);
  font-weight: 520;
  line-height: 1.15;
}

.next-links p {
  margin: 0;
  color: var(--muted);
  font-size: clamp(0.92rem, 1vw, 1.02rem);
  line-height: 1.45;
}

.status-key > div {
  grid-template-columns: minmax(8rem, 0.25fr) minmax(0, 1fr);
}

.status-key dt,
.status-key dd {
  margin: 0;
}

.status-key dd {
  max-inline-size: var(--measure);
  color: var(--muted);
  font-size: var(--body-size);
  line-height: 1.5;
}

.research-record {
  padding-block: clamp(3rem, 6vw, 5.5rem);
  border-block-end: 1px solid var(--line);
}

.record-head {
  display: grid;
  grid-template-columns: minmax(9rem, 0.22fr) minmax(0, 1fr);
  gap: var(--section-gap);
}

.record-head h2 {
  max-inline-size: 26ch;
}

.record-body {
  display: grid;
  grid-template-columns: minmax(9rem, 0.22fr) minmax(0, 1fr);
  gap: var(--section-gap);
  margin-block-start: clamp(1.75rem, 3vw, 2.5rem);
}

.record-body > div:last-child {
  display: grid;
  gap: 0;
  border-block-start: 1px solid var(--line);
}

.record-field {
  display: grid;
  grid-template-columns: minmax(9rem, 0.25fr) minmax(0, 1fr);
  gap: 1.25rem;
  padding-block: 1rem;
  border-block-end: 1px solid var(--line);
}

.field-label {
  margin: 0;
  text-transform: uppercase;
}

.record-field p {
  margin: 0;
}

.record-field p + p {
  margin-block-start: 0.75rem;
}

.record-source {
  margin-block-start: 1.25rem;
}

.result-row {
  grid-template-columns: minmax(9rem, 0.22fr) minmax(9rem, 0.18fr) minmax(0, 1fr);
  align-items: start;
}

.result-label {
  margin: 0;
  text-transform: uppercase;
}

.result-value {
  margin: 0;
  font-size: clamp(1.35rem, 2.2vw, 2rem);
  font-weight: 540;
  line-height: 1.08;
}

.result-context {
  margin: 0;
  color: var(--muted);
}

.definition-row,
.source-row,
.principle-row {
  grid-template-columns: minmax(9rem, 0.25fr) minmax(0, 1fr);
}

.definition-row dt,
.definition-row dd,
.source-row dt,
.source-row dd {
  margin: 0;
}

.definition-row dt,
.source-row dt {
  font-family: var(--font-mono);
  font-size: var(--label-size);
  line-height: 1.4;
  text-transform: uppercase;
}

.definition-row dd,
.source-row dd,
.principle-row p {
  max-inline-size: var(--measure);
  color: var(--muted);
  font-size: var(--body-size);
  line-height: 1.55;
}

.principle-row h3,
.principle-row p {
  margin: 0;
}

.method-steps {
  display: grid;
  gap: 0;
  margin: clamp(1.75rem, 3vw, 2.5rem) 0 0;
  padding: 0;
  list-style: none;
  border-block-start: 1px solid var(--line);
}

.method-steps li {
  display: grid;
  grid-template-columns: 4rem minmax(0, 1fr);
  gap: 1rem;
  padding-block: 1rem;
  border-block-end: 1px solid var(--line);
}

.method-steps span {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: var(--label-size);
}

.method-steps p {
  margin: 0;
}

.split-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin-block-start: clamp(1.75rem, 3vw, 2.5rem);
  border-block-start: 1px solid var(--line);
  border-inline-start: 1px solid var(--line);
}

.split-grid > div {
  min-block-size: 13rem;
  padding: 1rem;
  border-inline-end: 1px solid var(--line);
  border-block-end: 1px solid var(--line);
}

.split-grid h3 {
  margin-block-end: 0.8rem;
}

.split-grid p {
  margin: 0;
  color: var(--muted);
}

.diagram-set {
  display: grid;
  gap: clamp(3rem, 6vw, 5rem);
  margin-block-start: clamp(2rem, 4vw, 3rem);
}

.diagram-object {
  padding-block-end: clamp(3rem, 6vw, 5rem);
  border-block-end: 1px solid var(--line);
}

.diagram-object:last-child {
  padding-block-end: 0;
  border-block-end: 0;
}

.diagram-object h3 {
  max-inline-size: 32ch;
}

.source-diagram {
  display: block;
  inline-size: 100%;
  block-size: auto;
  margin-block-start: 1.5rem;
  border: 1px solid var(--line);
  background: #fff;
}

.source-diagram[role="button"] {
  cursor: zoom-in;
}

.source-diagram[role="button"]:hover,
.source-diagram[role="button"]:focus-visible {
  border-color: var(--ink);
}

.diagram-lightbox {
  inline-size: min(92vw, 82rem);
  max-inline-size: none;
  max-block-size: 88vh;
  padding: 0;
  border: 1px solid var(--ink);
  background: var(--background);
  color: var(--ink);
}

.diagram-lightbox::backdrop {
  background: color-mix(in srgb, var(--background) 28%, #000 72%);
}

.diagram-lightbox__inner {
  display: grid;
  gap: 1rem;
  padding: 1rem;
}

.diagram-lightbox__close {
  justify-self: end;
  padding: 0;
  border: 0;
  border-block-end: 1px solid currentcolor;
  background: transparent;
  color: inherit;
  font-family: var(--font-mono);
  font-size: var(--label-size);
  cursor: pointer;
}

.diagram-lightbox__image {
  display: block;
  inline-size: 100%;
  max-block-size: 72vh;
  object-fit: contain;
  border: 1px solid var(--line);
  background: #fff;
}

.diagram-lightbox__caption {
  max-inline-size: none;
  margin: 0;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: var(--label-size);
}

.diagram-rail {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  margin-block-start: 1.5rem;
  border-block-start: 1px solid var(--line);
  border-inline-start: 1px solid var(--line);
}

.diagram-node {
  position: relative;
  min-block-size: 10rem;
  padding: 1rem;
  border-inline-end: 1px solid var(--line);
  border-block-end: 1px solid var(--line);
}

.diagram-node strong {
  display: block;
  margin-block-end: 0.55rem;
  font-size: clamp(1.05rem, 1.4vw, 1.35rem);
  font-weight: 520;
  line-height: 1.15;
}

.diagram-node p {
  margin: 0;
  color: var(--muted);
  font-size: clamp(0.9rem, 1vw, 1rem);
  line-height: 1.45;
}

.diagram-rail .diagram-node:not(:last-child)::after {
  position: absolute;
  inset-block-start: 50%;
  inset-inline-end: -0.4rem;
  z-index: 1;
  inline-size: 0.72rem;
  block-size: 0.72rem;
  border-block-start: 1px solid var(--ink);
  border-inline-end: 1px solid var(--ink);
  background: var(--background);
  content: "";
  transform: translateY(-50%) rotate(45deg);
}

.diagram-branch {
  display: grid;
  grid-template-columns: 0.9fr 1.2fr 1fr;
  gap: 0;
  margin-block-start: 1.5rem;
  border-block-start: 1px solid var(--line);
  border-inline-start: 1px solid var(--line);
}

.diagram-branch > div {
  min-block-size: 10rem;
  padding: 1rem;
  border-inline-end: 1px solid var(--line);
  border-block-end: 1px solid var(--line);
}

.diagram-branch h4 {
  margin: 0 0 0.55rem;
  font-size: clamp(1rem, 1.3vw, 1.25rem);
  font-weight: 520;
  line-height: 1.2;
}

.diagram-branch p {
  margin: 0;
  color: var(--muted);
  font-size: clamp(0.9rem, 1vw, 1rem);
  line-height: 1.45;
}

.about-intro {
  max-inline-size: 43rem;
  color: var(--muted);
  font-size: var(--lede-size);
  line-height: 1.35;
}

.signature {
  margin-block-start: 2.25rem;
  font-family: var(--font-mono);
  font-size: var(--label-size);
  line-height: 1.5;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1.1rem;
  padding-inline: var(--page-pad);
  border-block-start: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: var(--label-size);
}

.site-footer p {
  margin: 0;
  font-size: inherit;
}

.site-footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.2rem;
}

.site-footer a {
  border-block-end: 1px solid currentcolor;
}

@media (width <= 64rem) {
  .evidence-grid,
  .next-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .research-list > a {
    grid-template-columns: minmax(14rem, 0.42fr) minmax(0, 1fr);
  }

  .research-list .record-status {
    grid-column: 2;
    text-align: start;
  }

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

  .flow > div:nth-child(2)::after,
  .diagram-rail .diagram-node:nth-child(2)::after {
    display: none;
  }
}

@media (width <= 48rem) {
  .site-header {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 0.5rem;
    padding-inline: 1rem;
  }

  .brand {
    font-size: 0.76rem;
  }

  .header-actions {
    gap: 0.2rem;
  }

  .menu-panel {
    position: absolute;
    inset-block-start: 100%;
    inset-inline: 0;
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
    padding: 0.55rem var(--page-pad) 0.9rem;
    border-block-end: 1px solid var(--line);
    background: var(--background);
  }

  .site-header.menu-ready .menu-panel:not([data-open]) {
    display: none;
  }

  .nav-links {
    display: grid;
    grid-template-columns: 1fr;
    justify-content: stretch;
    gap: 0;
  }

  .nav-links a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-block-size: 2.9rem;
    border-block-end: 1px solid var(--soft-line);
    color: var(--ink);
    font-size: 1rem;
  }

  .nav-links a:last-child {
    border-block-end: 0;
  }

  .contact-links--menu {
    display: flex;
    justify-content: flex-start;
    gap: 0.5rem;
    padding-block-start: 0.75rem;
    padding-inline-start: 0;
    border-block-start: 1px solid var(--soft-line);
    border-inline-start: 0;
  }

  .contact-link {
    inline-size: 2.5rem;
    min-block-size: 2.5rem;
  }

  .theme-toggle {
    inline-size: 1.65rem;
    min-block-size: 1.65rem;
  }

  .menu-toggle {
    display: grid;
    inline-size: 1.8rem;
    min-block-size: 1.8rem;
  }

  .section-grid,
  .record-head,
  .record-body {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .hero,
  .page-hero {
    min-block-size: auto;
  }

  .hero-main {
    padding-block: 3rem;
  }

  h1,
  .page-hero h1 {
    max-inline-size: 100%;
  }

  h2 {
    max-inline-size: 100%;
  }

  .record-body {
    margin-block-start: 1.25rem;
  }

  .status-key > div,
  .record-field,
  .definition-row,
  .source-row,
  .principle-row,
  .result-row {
    grid-template-columns: 1fr;
    gap: 0.55rem;
  }

  .diagram-branch {
    grid-template-columns: 1fr;
  }
}

@media (width <= 40rem) {
  .evidence-grid,
  .next-links,
  .split-grid,
  .flow,
  .diagram-rail {
    grid-template-columns: 1fr;
  }

  .flow > div::after,
  .diagram-rail .diagram-node::after {
    display: none;
  }

  .research-list > a {
    grid-template-columns: 1fr;
    gap: 0.55rem;
  }

  .research-list .record-status {
    grid-column: 1;
  }
}

@media (width <= 36rem) {
  main {
    padding-inline: 1.15rem;
  }

  .method-steps li {
    grid-template-columns: 2.75rem minmax(0, 1fr);
  }

  .site-footer {
    display: grid;
  }
}

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

  body,
  .nav-links a,
  .text-link,
  .contact-link,
  .menu-toggle__icon::before,
  .menu-toggle__icon::after {
    transition: none;
  }

  .text-link:hover,
  .text-link:focus-visible,
  .text-link:active {
    transform: none;
  }

  .contact-link:hover,
  .contact-link:focus-visible,
  .contact-link:active {
    transform: none;
  }
}