:root {
  color-scheme: light;
  --canvas: #f4f6f8;
  --surface: #ffffff;
  --surface-muted: #eef1f5;
  --ink: #121826;
  --ink-secondary: #596274;
  --ink-muted: #7c8597;
  --line: #d5dbe5;
  --line-strong: #aeb7c6;
  --accent: #2f5bff;
  --accent-soft: #e9eeff;
  --accent-strong: #2147d8;
  --status-success: #15803d;
  --status-warning: #a16207;
  --status-danger: #b42318;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 40px;
  --space-6: 48px;
  --space-8: 64px;
  --space-10: 80px;
  --radius: 4px;
  --font-ui: "IBM Plex Sans", "Segoe UI", Arial, sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
  font-family: var(--font-ui);
  color: var(--ink);
  background: var(--canvas);
  line-height: 1.55;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    linear-gradient(to right, transparent calc(100% - 1px), rgba(174, 183, 198, 0.14) 1px) 0 0 / 8px 8px,
    var(--canvas);
  background-size: 64px 64px;
}

body,
button,
a {
  font-family: var(--font-ui);
}

a {
  color: inherit;
}

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

h1,
h2,
h3,
h4,
p,
dl,
dd,
ul,
ol {
  margin-top: 0;
}

h1,
h2,
h3,
h4 {
  line-height: 1.12;
}

h1 {
  margin-bottom: var(--space-3);
  font-size: clamp(2.75rem, 6vw, 5.75rem);
  font-weight: 600;
  letter-spacing: -0.055em;
}

h2 {
  font-size: clamp(1.75rem, 3.2vw, 3rem);
  font-weight: 550;
  letter-spacing: -0.035em;
}

h3 {
  font-size: 1rem;
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: var(--space-2);
  left: var(--space-2);
  padding: 10px 14px;
  background: var(--ink);
  color: var(--surface);
  transform: translateY(-160%);
}

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

.shell {
  width: min(1280px, calc(100% - 64px));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  z-index: 40;
  top: 0;
  border-bottom: 1px solid var(--line);
  background: rgba(244, 246, 248, 0.96);
}

.header-inner,
.footer-inner {
  display: flex;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand-link {
  display: inline-flex;
  min-width: 88px;
  min-height: 44px;
  align-items: center;
}

.brand-link img {
  width: 72px;
  height: 24px;
}

.primary-nav {
  display: flex;
  align-items: stretch;
  gap: var(--space-1);
}

.primary-nav a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  padding: 0 var(--space-2);
  border-bottom: 2px solid transparent;
  color: var(--ink-secondary);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
}

.primary-nav a:hover,
.primary-nav a[aria-current="page"] {
  border-color: var(--accent);
  color: var(--ink);
}

.hero {
  min-height: calc(100vh - 72px);
  padding: var(--space-5) 0 var(--space-8);
}

.hero-rail,
.system-id-row {
  display: flex;
  justify-content: space-between;
  gap: var(--space-2);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--line-strong);
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-3);
  padding-top: var(--space-10);
}

.hero-grid::before {
  position: absolute;
  top: calc(var(--space-10) - 1px);
  right: 0;
  left: 0;
  border-top: 1px solid var(--line-strong);
  content: "";
}

.hero-mark {
  position: relative;
  grid-column: 1 / 4;
  padding-top: var(--space-3);
}

.hero-mark::before,
.hero-copy::before,
.hero-profile::before {
  position: absolute;
  top: -4px;
  left: 0;
  width: 8px;
  height: 8px;
  border: 2px solid var(--canvas);
  background: var(--accent);
  content: "";
}

.hero-mark img {
  width: min(216px, 100%);
}

.hero-copy {
  position: relative;
  grid-column: 4 / 10;
  padding-top: var(--space-3);
}

.section-index,
.node-id,
.group-label,
.registry-id,
.system-id-row,
.registry-field > span,
.practice-card > span,
.integration-grid article > span,
.capability-card > span {
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.hero-copy h1 {
  max-width: 9ch;
}

.hero-title {
  max-width: 34ch;
  margin-bottom: var(--space-3);
  color: var(--ink);
  font-size: clamp(1.25rem, 2.2vw, 1.75rem);
  line-height: 1.3;
}

.hero-positioning {
  max-width: 60ch;
  margin-bottom: var(--space-4);
  color: var(--ink-secondary);
  font-size: 1.05rem;
}

.button-row,
.meta-list,
.action-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 10px 16px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 650;
  text-decoration: none;
  transition: border-color 150ms ease, background 150ms ease, color 150ms ease;
}

.button-primary {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--surface);
}

.button-primary:hover {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
}

.button-secondary {
  background: var(--surface);
}

.button-secondary:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
}

.hero-profile {
  position: relative;
  grid-column: 10 / 13;
  align-self: start;
  margin-top: var(--space-3);
  border-top: 2px solid var(--ink);
  background: var(--surface);
}

.hero-profile::before {
  top: -29px;
}

.hero-profile-heading {
  display: flex;
  justify-content: space-between;
  gap: var(--space-1);
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.hero-facts {
  position: relative;
  display: grid;
  margin-bottom: 0;
  padding-left: 12px;
}

.hero-facts::before {
  position: absolute;
  top: 22px;
  bottom: 22px;
  left: 27px;
  border-left: 1px solid var(--line-strong);
  content: "";
}

.hero-facts div {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 0 8px;
  padding: 14px 12px 14px 0;
  border-bottom: 1px solid var(--line);
}

.hero-facts div > span {
  z-index: 1;
  grid-row: 1 / 3;
  align-self: center;
  width: 31px;
  padding: 4px 0;
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  text-align: center;
}

.hero-facts dt {
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
}

.hero-facts dd {
  margin: 0;
  font-size: 0.92rem;
  font-weight: 600;
}

.topology-section,
.registry,
.system-header,
.system-section,
.not-found,
.error-page {
  padding-top: var(--space-10);
  padding-bottom: var(--space-10);
}

.topology-section {
  border-block: 1px solid var(--line-strong);
  background: var(--surface-muted);
}

.section-heading {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-3);
  align-items: end;
  margin-bottom: var(--space-6);
}

.section-heading > div {
  grid-column: 1 / 8;
}

.section-heading > p {
  grid-column: 9 / 13;
  margin-bottom: 8px;
  color: var(--ink-secondary);
}

.section-heading h1,
.section-heading h2 {
  max-width: 18ch;
  margin-bottom: 0;
}

.topology {
  position: relative;
  display: grid;
  min-height: 510px;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  grid-template-rows: 104px 48px 100px 100px 120px;
  column-gap: 24px;
  padding: var(--space-3);
  background: transparent;
}

.topology-lines {
  position: absolute;
  z-index: 0;
  inset: var(--space-3);
  width: calc(100% - 48px);
  height: calc(100% - 48px);
  overflow: visible;
  pointer-events: none;
}

.topology-edge {
  fill: none;
  stroke: var(--line-strong);
  stroke-width: 1.5;
  vector-effect: non-scaling-stroke;
  transition: opacity 160ms ease, stroke 160ms ease, stroke-width 160ms ease;
}

.topology-node {
  position: relative;
  z-index: 2;
  display: flex;
  min-height: 88px;
  flex-direction: column;
  justify-content: center;
  padding: 12px 16px;
  border: 1px solid var(--line-strong);
  border-left: 4px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
  text-decoration: none;
  transition: opacity 160ms ease, border-color 160ms ease, transform 160ms ease;
}

a.topology-node:hover,
a.topology-node:focus-visible,
.topology-node[data-related="true"] {
  border-color: var(--accent);
}

a.topology-node:hover,
a.topology-node:focus-visible {
  transform: translateY(-2px);
}

.topology[data-focused="true"] .topology-node:not([data-related="true"]),
.topology[data-focused="true"] .topology-edge:not([data-related="true"]) {
  opacity: 0.28;
}

.topology-edge[data-related="true"] {
  stroke: var(--accent);
  stroke-width: 2.5;
}

.topology-node strong {
  margin: 2px 0;
  font-size: 1rem;
}

.topology-node > span:last-child {
  color: var(--ink-secondary);
  font-size: 0.78rem;
}

.node-root {
  grid-column: 6 / 8;
  grid-row: 1;
  border-left-color: var(--accent);
}

.node-systems {
  grid-column: 1 / 4;
  grid-row: 3;
}

.node-engineering {
  grid-column: 5 / 9;
  grid-row: 3;
}

.node-operations {
  grid-column: 10 / 13;
  grid-row: 3;
}

.node-project {
  grid-row: 5;
}

.project-slot-1 { grid-column: 1 / 4; }
.project-slot-2 { grid-column: 4 / 7; }
.project-slot-3 { grid-column: 7 / 10; }
.project-slot-4 { grid-column: 10 / 13; }

.registry {
  min-height: calc(100vh - 145px);
}

.registry-labels,
.registry-row {
  display: grid;
  grid-template-columns: 96px minmax(300px, 2.4fr) minmax(150px, 1fr) minmax(150px, 1fr) 128px;
  gap: var(--space-3);
}

.registry-labels {
  padding: 0 var(--space-2) var(--space-1);
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.registry-list {
  border-top: 1px solid var(--line-strong);
}

.registry-row {
  min-height: 144px;
  align-items: center;
  padding: var(--space-3) var(--space-2);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.55);
  transition: background 150ms ease, box-shadow 150ms ease;
}

.registry-row:hover {
  background: rgba(255, 255, 255, 0.9);
}

.registry-row[data-inspectable="true"]:focus-within,
.registry-row[data-inspectable="true"]:hover {
  box-shadow: inset 3px 0 var(--accent);
}

.registry-row:target {
  box-shadow: inset 4px 0 var(--accent);
  background: var(--accent-soft);
}

.registry-id {
  color: var(--ink-muted);
}

.registry-name h2 {
  margin-bottom: var(--space-1);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.registry-name h2 a,
.registry-action a,
.back-link {
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.registry-name p {
  max-width: 58ch;
  margin-bottom: 0;
  color: var(--ink-secondary);
  font-size: 0.9rem;
}

.registry-field {
  display: grid;
  gap: 4px;
}

.registry-field strong {
  font-size: 0.9rem;
  font-weight: 600;
}

.registry-field small {
  color: var(--ink-secondary);
}

.registry-action a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  font-size: 0.82rem;
  font-weight: 650;
}

.registry-action > span {
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
}

.system-header {
  min-height: 640px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.system-header .back-link {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  align-self: flex-start;
  margin-bottom: var(--space-6);
  color: var(--ink-secondary);
  font-size: 0.85rem;
}

.system-id-row {
  margin-bottom: var(--space-5);
}

.system-header h1 {
  max-width: 10ch;
}

.system-lede {
  max-width: 52ch;
  margin-bottom: var(--space-4);
  color: var(--ink-secondary);
  font-size: clamp(1.2rem, 2.2vw, 1.65rem);
}

.meta-list {
  margin-bottom: var(--space-4);
}

.meta-badge {
  display: inline-flex;
  min-height: 32px;
  align-items: center;
  gap: var(--space-1);
  padding: 5px 10px;
  border: 1px solid var(--line);
  background: var(--surface);
  font-size: 0.78rem;
}

.meta-key {
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
}

.project-navigation {
  position: sticky;
  z-index: 30;
  top: 73px;
  border-block: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.97);
}

.project-navigation-inner {
  display: grid;
  min-height: 56px;
  grid-template-columns: 144px minmax(0, 1fr);
  gap: var(--space-3);
  align-items: center;
}

.project-navigation-label {
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.project-navigation-inner > div {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
}

.project-navigation a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: var(--ink-secondary);
  font-size: 0.76rem;
  font-weight: 600;
  text-decoration-color: transparent;
  text-underline-offset: 5px;
}

.project-navigation a:hover,
.project-navigation a:focus-visible {
  color: var(--ink);
  text-decoration-color: var(--accent);
}

.system-section-stack {
  border-top: 1px solid var(--line-strong);
  background: var(--canvas);
}

.system-section {
  border-bottom: 1px solid var(--line-strong);
}

.split-section {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-3);
}

.section-label {
  grid-column: 1 / 4;
}

.section-label > span {
  display: block;
  margin-bottom: var(--space-2);
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.section-label h2 {
  max-width: 8ch;
  margin-bottom: 0;
  font-size: clamp(1.5rem, 2.4vw, 2.3rem);
}

.section-label h3 {
  max-width: 9ch;
  margin-bottom: 0;
  font-size: clamp(1.3rem, 2vw, 1.8rem);
  font-weight: 550;
}

.section-content {
  grid-column: 4 / 13;
}

.section-intro,
.prose-lead > p:first-child {
  max-width: 60ch;
  color: var(--ink);
  font-size: 1.15rem;
}

.prose-lead > p:not(:first-child) {
  max-width: 70ch;
  color: var(--ink-secondary);
}

.problem-statement {
  max-width: 72ch;
  margin: var(--space-5) 0;
  padding: var(--space-3);
  border-left: 4px solid var(--accent);
  background: var(--surface);
}

.problem-statement > span {
  display: block;
  margin-bottom: var(--space-2);
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.problem-statement p {
  margin-bottom: 0;
  font-size: 1.05rem;
}

.constraint-list {
  display: grid;
  max-width: 76ch;
  gap: var(--space-1);
  margin: var(--space-4) 0 0;
  padding: 0;
  list-style: none;
}

.constraint-list li {
  position: relative;
  padding: 12px 16px 12px 40px;
  border-top: 1px solid var(--line);
  color: var(--ink-secondary);
}

.constraint-list li::before {
  position: absolute;
  left: 8px;
  color: var(--accent);
  content: "→";
}

.responsibility-matrix,
.responsibility-items,
.decision-list,
.connection-list,
.credit-block {
  display: grid;
  gap: var(--space-2);
}

.responsibility-group {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--line);
}

.responsibility-item {
  padding-bottom: var(--space-2);
}

.responsibility-item h3 {
  margin-bottom: var(--space-1);
}

.responsibility-item p {
  margin-bottom: var(--space-2);
  color: var(--ink-secondary);
}

.action-tags span {
  padding: 3px 7px;
  border: 1px solid var(--line);
  color: var(--ink-secondary);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  text-transform: uppercase;
}

.credit-block {
  margin-top: var(--space-4);
  padding: var(--space-3);
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
}

.credit-block ul {
  display: grid;
  gap: var(--space-2);
  margin-bottom: 0;
  padding: 0;
  list-style: none;
}

.credit-block li {
  display: grid;
  gap: 4px;
}

.credit-block li span {
  color: var(--ink-secondary);
}

.architecture-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px var(--space-3);
  align-items: end;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--line-strong);
}

.architecture-heading > span {
  grid-column: 1 / 3;
  color: var(--ink-secondary);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.architecture-heading h3,
.architecture-heading p {
  margin-bottom: 0;
}

.architecture-heading h3 {
  font-size: 1.25rem;
}

.architecture-heading p {
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
}

.boundary-nodes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 var(--space-3);
  margin: 0 0 var(--space-5);
  padding: 0;
  border-bottom: 1px solid var(--line);
  list-style: none;
}

.boundary-node {
  display: grid;
  min-height: 88px;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 2px var(--space-2);
  align-content: center;
  padding: var(--space-2) 0;
  border-top: 1px solid var(--line);
}

.boundary-node > span,
.boundary-node small {
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
}

.boundary-node > span {
  grid-row: 1 / 3;
  align-self: center;
  color: var(--accent-strong);
}

.boundary-node small {
  grid-column: 2;
}

.architecture-relationships {
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.architecture-relationships > summary {
  display: grid;
  min-height: 72px;
  grid-template-columns: 160px minmax(0, 1fr) auto;
  gap: var(--space-2);
  align-items: center;
  cursor: pointer;
  list-style: none;
}

.architecture-relationships > summary::-webkit-details-marker,
.technical-inspection > summary::-webkit-details-marker {
  display: none;
}

.architecture-relationships > summary > span:first-child {
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
}

.architecture-relationships[open] > summary {
  border-bottom: 1px solid var(--line);
}

.architecture-relationships[open] .summary-action,
.technical-inspection[open] > summary .summary-action {
  font-size: 0;
}

.architecture-relationships[open] .summary-action::after,
.technical-inspection[open] > summary .summary-action::after {
  font-size: 0.7rem;
  content: "Close";
}

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

.connection-list li {
  display: grid;
  grid-template-columns: 1fr 140px 1fr;
  gap: var(--space-2);
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.86rem;
}

.connection-kind {
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-align: center;
  text-transform: uppercase;
}

.decision {
  border-top: 1px solid var(--line-strong);
}

.decision:last-child {
  border-bottom: 1px solid var(--line);
}

.decision summary {
  display: grid;
  min-height: 88px;
  grid-template-columns: 48px minmax(0, 1fr) auto;
  gap: var(--space-2);
  align-items: center;
  cursor: pointer;
  list-style: none;
}

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

.decision summary > span:first-child,
.summary-action {
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
}

.decision summary > span:first-child {
  font-size: 0.84rem;
}

.decision summary strong {
  font-size: 1.04rem;
}

.decision[open] .summary-action {
  font-size: 0;
}

.decision[open] .summary-action::after {
  font-size: 0.7rem;
  content: "Close";
}

.decision-body {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  padding: var(--space-3) var(--space-3) var(--space-4) 64px;
  border-left: 3px solid var(--accent);
  background: var(--surface-muted);
}

.decision-body h4 {
  margin-bottom: var(--space-1);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
}

.decision-body p,
.decision-body li {
  color: var(--ink-secondary);
  font-size: 0.9rem;
}

.runtime-practices {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
  list-style: none;
}

.runtime-practice {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: var(--space-2);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--line);
}

.runtime-practice > span {
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.runtime-practice strong {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.runtime-practice p {
  margin: 4px 0 0;
  color: var(--ink-secondary);
}

.runtime-detail {
  margin-top: var(--space-2);
}

.runtime-detail summary {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  width: fit-content;
  cursor: pointer;
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-decoration: underline;
  text-underline-offset: 4px;
  text-transform: uppercase;
}

.runtime-detail ul {
  margin: var(--space-2) 0 0;
  padding-left: var(--space-3);
  color: var(--ink-secondary);
  font-size: 0.88rem;
}

.state-section {
  margin-top: var(--space-8);
  margin-bottom: var(--space-8);
  border: 1px solid var(--line-strong);
  border-left: 4px solid var(--accent);
  background: var(--surface);
}

.technical-inspection {
  border-block: 1px solid var(--line-strong);
  background: var(--surface-muted);
}

.technical-inspection > summary {
  display: grid;
  min-height: 160px;
  grid-template-columns: minmax(0, 7fr) minmax(240px, 4fr) auto;
  gap: var(--space-3);
  align-items: center;
  cursor: pointer;
  list-style: none;
}

.technical-inspection > summary span:first-child {
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.technical-inspection > summary h2,
.technical-inspection > summary p {
  margin-bottom: 0;
}

.technical-inspection > summary h2 {
  margin-top: var(--space-1);
  font-size: clamp(1.6rem, 3vw, 2.6rem);
}

.technical-inspection > summary p {
  color: var(--ink-secondary);
}

.technical-inspection[open] > summary {
  border-bottom: 1px solid var(--line-strong);
}

.inspection-stack {
  background: var(--surface);
}

.inspection-section {
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
  border-bottom: 1px solid var(--line);
}

.domain-list,
.integration-list,
.capability-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.domain-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 var(--space-3);
  border-bottom: 1px solid var(--line);
}

.domain-list li {
  display: grid;
  gap: 6px;
  min-height: 112px;
  align-content: center;
  padding: var(--space-2) 0;
  border-top: 1px solid var(--line);
}

.domain-list li span,
.capability-item span {
  color: var(--ink-secondary);
  font-size: 0.88rem;
}

.integration-list {
  border-top: 1px solid var(--line-strong);
}

.integration-list li {
  display: grid;
  grid-template-columns: 128px minmax(160px, 0.8fr) minmax(240px, 1.4fr) 160px;
  gap: var(--space-2);
  align-items: center;
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--line);
}

.integration-list li > span,
.integration-list small {
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  text-transform: uppercase;
}

.integration-list p {
  margin-bottom: 0;
  color: var(--ink-secondary);
  font-size: 0.86rem;
}

.capability-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 var(--space-3);
  border-bottom: 1px solid var(--line);
}

.capability-item {
  display: grid;
  min-height: 104px;
  gap: 6px;
  align-content: center;
  padding: var(--space-2) 0;
  border-top: 1px solid var(--line);
}

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

.milestone-list li {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-top: 1px solid var(--line);
}

.milestone-list li span {
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
}

.milestone-list p {
  margin-bottom: 0;
}

.public-footer {
  border-top: 1px solid var(--line-strong);
  background: var(--surface-muted);
}

.footer-inner {
  min-height: 88px;
  color: var(--ink-secondary);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
}

.not-found,
.error-page {
  min-height: calc(100vh - 160px);
}

.not-found h1,
.error-page h1 {
  max-width: 16ch;
  font-size: clamp(2.5rem, 5vw, 4.5rem);
}

.not-found p,
.error-page > p {
  max-width: 60ch;
  color: var(--ink-secondary);
}

@media (max-width: 1023px) {
  .shell {
    width: min(100% - 48px, 960px);
  }

  .hero-grid,
  .section-heading,
  .split-section {
    grid-template-columns: repeat(8, minmax(0, 1fr));
  }

  .hero-mark { grid-column: 1 / 3; }
  .hero-copy { grid-column: 3 / 7; }
  .hero-profile { grid-column: 7 / 9; }
  .section-heading > div { grid-column: 1 / 6; }
  .section-heading > p { grid-column: 6 / 9; }
  .section-label { grid-column: 1 / 3; }
  .section-content { grid-column: 3 / 9; }

  .registry-labels,
  .registry-row {
    grid-template-columns: 80px minmax(260px, 2fr) minmax(130px, 1fr) minmax(130px, 1fr);
  }

  .registry-labels span:last-child,
  .registry-action {
    display: none;
  }

  .project-navigation-inner {
    grid-template-columns: 112px minmax(0, 1fr);
  }

  .project-navigation-inner > div {
    gap: var(--space-2);
  }

  .integration-list li {
    grid-template-columns: 112px minmax(160px, 0.8fr) minmax(220px, 1.4fr);
  }

  .integration-list small {
    grid-column: 2 / 4;
  }
}

@media (max-width: 767px) {
  html {
    scroll-behavior: auto;
  }

  .shell {
    width: min(100% - 32px, 680px);
  }

  .header-inner {
    min-height: 64px;
  }

  .primary-nav a {
    padding-inline: 12px;
  }

  .hero {
    min-height: auto;
    padding-top: var(--space-3);
  }

  .hero-rail span:last-child,
  .hero-mark {
    display: none;
  }

  .hero-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    padding-top: var(--space-6);
  }

  .hero-copy,
  .hero-profile {
    grid-column: 1 / 5;
  }

  .hero-copy h1 {
    max-width: none;
  }

  .hero-profile {
    margin-top: var(--space-5);
  }

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

  .button-row .button {
    width: 100%;
  }

  .topology-section,
  .registry,
  .system-header,
  .system-section,
  .not-found,
  .error-page {
    padding-top: var(--space-8);
    padding-bottom: var(--space-8);
  }

  .section-heading,
  .split-section {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .section-heading > div,
  .section-heading > p,
  .section-label,
  .section-content {
    grid-column: 1 / 5;
  }

  .section-heading > p {
    margin-bottom: 0;
  }

  .topology {
    display: flex;
    min-height: 0;
    flex-direction: column;
    gap: var(--space-2);
    padding: var(--space-2) 0 var(--space-2) var(--space-3);
    border-left: 1px solid var(--line-strong);
    background: transparent;
  }

  .topology-lines {
    display: none;
  }

  .topology-node {
    width: 100%;
    min-height: 80px;
  }

  .node-project {
    width: calc(100% - 24px);
    margin-left: 24px;
  }

  .topology-node::before {
    position: absolute;
    top: 50%;
    left: -25px;
    width: 24px;
    border-top: 1px solid var(--line-strong);
    content: "";
  }

  .node-project::before {
    left: -49px;
    width: 48px;
  }

  .registry-heading {
    margin-bottom: var(--space-5);
  }

  .registry-labels {
    display: none;
  }

  .registry-row {
    display: grid;
    min-height: 0;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--space-2);
    padding: var(--space-4) var(--space-2);
  }

  .registry-id,
  .registry-name,
  .registry-field,
  .registry-action {
    grid-column: 1 / 5;
  }

  .registry-field {
    grid-column: span 2;
  }

  .registry-action {
    display: block;
  }

  .system-header {
    min-height: calc(100vh - 64px);
  }

  .project-navigation {
    position: static;
  }

  .project-navigation-inner {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    padding-top: 12px;
    padding-bottom: 12px;
  }

  .project-navigation-label,
  .project-navigation-inner > div {
    grid-column: 1 / 5;
  }

  .project-navigation-inner > div {
    justify-content: flex-start;
    flex-wrap: wrap;
    gap: 0 var(--space-2);
  }

  .project-navigation a {
    min-height: 44px;
  }

  .system-id-row {
    display: grid;
  }

  .section-label h2 {
    max-width: none;
  }

  .responsibility-group {
    grid-template-columns: 1fr;
  }

  .boundary-nodes,
  .domain-list,
  .capability-list,
  .decision-body {
    grid-template-columns: 1fr;
  }

  .architecture-heading,
  .technical-inspection > summary {
    grid-template-columns: 1fr;
  }

  .architecture-heading > span {
    grid-column: 1;
  }

  .architecture-heading p {
    margin-top: var(--space-1);
  }

  .architecture-relationships > summary {
    grid-template-columns: minmax(0, 1fr) auto;
    padding: 12px 0;
  }

  .architecture-relationships > summary > span:first-child {
    grid-column: 1 / 3;
  }

  .connection-list li {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .connection-kind {
    text-align: left;
  }

  .decision summary {
    grid-template-columns: 36px minmax(0, 1fr);
    padding: 12px 0;
  }

  .summary-action {
    display: none;
  }

  .decision-body {
    margin-bottom: var(--space-2);
    padding-left: 0;
    border-left-width: 0;
  }

  .state-section {
    padding-right: var(--space-3);
    padding-left: var(--space-3);
  }

  .technical-inspection > summary {
    min-height: 0;
    padding-top: var(--space-6);
    padding-bottom: var(--space-6);
  }

  .technical-inspection > summary .summary-action {
    justify-self: start;
  }

  .inspection-section {
    padding-top: var(--space-6);
    padding-bottom: var(--space-6);
  }

  .integration-list li {
    grid-template-columns: 1fr;
    gap: 6px;
    padding: var(--space-3) 0;
  }

  .integration-list small {
    grid-column: 1;
  }

  .milestone-list li {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
  }
}

.system-detail [id] {
  scroll-margin-top: 144px;
}

@media (max-width: 767px) {
  .system-detail [id] {
    scroll-margin-top: 80px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}