:root {
  color-scheme: light;
  --paper: #fff;
  --surface: #fff;
  --ink: #173b67;
  --muted: #385b82;
  --line: #b7c9dc;
  --line-strong: #8fa8c3;
  --accent: #1c4fa3;
  --accent-strong: #173b67;
  --accent-soft: #edf4fb;
  --code: #f3f7fb;
  --code-ink: #173b67;
  --accent-ink: #fff;
  --edge: #47536b;
  --shadow: 0 12px 32px rgb(17 24 39 / 16%), 0 1px 3px rgb(17 24 39 / 10%);
  --k-actor: #2359b5;
  --k-journey: #6941c6;
  --k-use-case: #18794e;
  --k-business-rule: #b54708;
  --k-domain-term: #8a6100;
  --k-bounded-context: #0b7285;
  --k-functional-requirement: #b0287a;
  --k-quality-requirement: #56607a;
  --k-constraint: #b42318;
  --k-structured-behaviour: #466c10;
  /* Section colors identify semantic families, anchored to the existing PDaC artifact palette. */
  --section-requirements: var(--k-functional-requirement);
  --section-structures: var(--k-bounded-context);
  --section-concepts: var(--k-business-rule);
  --section-reference: var(--k-quality-requirement);
  --st-active-fg: #17512a;
  --st-active-bg: #e4efe6;
  --st-draft-fg: #6f5714;
  --st-draft-bg: #f7efd6;
  --st-deprecated-fg: #8a4214;
  --st-deprecated-bg: #fae4d6;
  --st-retired-fg: #4f5560;
  --st-retired-bg: #eceff3;
  --sans:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-appearance]) {
    color-scheme: dark;
    --paper: #0f1216;
    --surface: #141920;
    --ink: #eef1f5;
    --muted: #a5afbe;
    --line: #2b333f;
    --line-strong: #3a4350;
    --accent: #7aa7ff;
    --accent-strong: #9abaff;
    --accent-soft: #1a2432;
    --code: #141920;
    --code-ink: #eef1f5;
    --edge: #3a4350;
    --shadow: 0 12px 32px rgb(0 0 0 / 35%), 0 1px 3px rgb(0 0 0 / 25%);
    --k-actor: #80a9ff;
    --k-journey: #ab8ffa;
    --k-use-case: #4fcb8c;
    --k-business-rule: #f79c50;
    --k-domain-term: #e3b544;
    --k-bounded-context: #43c4da;
    --k-functional-requirement: #f27ec2;
    --k-quality-requirement: #a9b2c5;
    --k-constraint: #f7776c;
    --k-structured-behaviour: #a5d05a;
    --section-requirements: var(--k-functional-requirement);
    --section-structures: var(--k-bounded-context);
    --section-concepts: var(--k-business-rule);
    --section-reference: var(--k-quality-requirement);
    --st-active-fg: #76d49b;
    --st-active-bg: #183126;
    --st-draft-fg: #e6c46b;
    --st-draft-bg: #332d1c;
    --st-deprecated-fg: #f0a777;
    --st-deprecated-bg: #39251e;
    --st-retired-fg: #a5afbe;
    --st-retired-bg: #252b34;
  }
}

:root[data-appearance='dark'] {
  color-scheme: dark;
  --paper: #0f1216;
  --surface: #141920;
  --ink: #eef1f5;
  --muted: #a5afbe;
  --line: #2b333f;
  --line-strong: #3a4350;
  --accent: #7aa7ff;
  --accent-strong: #9abaff;
  --accent-soft: #1a2432;
  --code: #141920;
  --code-ink: #eef1f5;
  --edge: #3a4350;
  --shadow: 0 12px 32px rgb(0 0 0 / 35%), 0 1px 3px rgb(0 0 0 / 25%);
  --k-actor: #80a9ff;
  --k-journey: #ab8ffa;
  --k-use-case: #4fcb8c;
  --k-business-rule: #f79c50;
  --k-domain-term: #e3b544;
  --k-bounded-context: #43c4da;
  --k-functional-requirement: #f27ec2;
  --k-quality-requirement: #a9b2c5;
  --k-constraint: #f7776c;
  --k-structured-behaviour: #a5d05a;
  --section-requirements: var(--k-functional-requirement);
  --section-structures: var(--k-bounded-context);
  --section-concepts: var(--k-business-rule);
  --section-reference: var(--k-quality-requirement);
  --st-active-fg: #76d49b;
  --st-active-bg: #183126;
  --st-draft-fg: #e6c46b;
  --st-draft-bg: #332d1c;
  --st-deprecated-fg: #f0a777;
  --st-deprecated-bg: #39251e;
  --st-retired-fg: #a5afbe;
  --st-retired-bg: #252b34;
}

:root[data-appearance='light'] {
  color-scheme: light;
  --line-strong: #8fa8c3;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-appearance]) a:hover {
    color: var(--accent);
  }
  :root:not([data-appearance]) .button:hover,
  :root:not([data-appearance]) .cta-band .button:hover {
    background: #2b4d79;
  }
}

:root[data-appearance='dark'] a:hover {
  color: var(--accent);
}
:root[data-appearance='dark'] .button:hover,
:root[data-appearance='dark'] .cta-band .button:hover {
  background: #2b4d79;
}

* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background-color: var(--paper);
  background-image:
    linear-gradient(to right, rgb(28 79 163 / 2.5%) 1px, transparent 1px),
    linear-gradient(to bottom, rgb(28 79 163 / 2.5%) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--ink);
  font: 16px/1.65 var(--sans);
}
a {
  color: var(--accent-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}
a:hover {
  color: #102f55;
  text-decoration-thickness: 2px;
}
a:focus-visible,
button:focus-visible {
  outline: 3px solid #2b6dbe;
  outline-offset: 3px;
}
img,
svg {
  max-width: 100%;
}
code,
pre {
  font-family: var(--mono);
}
code {
  font-size: 0.9em;
}
.skip-link {
  position: absolute;
  top: -4rem;
  left: 1rem;
  z-index: 10;
  background: var(--surface);
  padding: 0.7rem 1rem;
  border: 1px solid var(--line);
}
.skip-link:focus {
  top: 1rem;
}
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}
.header-inner,
.footer-inner {
  width: min(1160px, calc(100% - 3rem));
  margin: 0 auto;
}
.header-inner {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--ink);
  text-decoration: none;
  font-weight: 750;
  letter-spacing: -0.04em;
  font-size: 1.15rem;
  white-space: nowrap;
}
.brand-icon {
  display: block;
  width: 38px;
  height: 38px;
  object-fit: contain;
  flex: none;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: clamp(0.8rem, 2vw, 1.7rem);
  flex-wrap: wrap;
  justify-content: end;
}
.main-nav a,
.language-switch a {
  font-size: 0.87rem;
  color: var(--ink);
  text-decoration: none;
}
.main-nav a[aria-current='page'] {
  color: var(--accent-strong);
  text-decoration: underline;
  text-underline-offset: 0.4em;
}
.main-nav a:hover,
.language-switch a:hover {
  color: var(--accent-strong);
}
.language-switch {
  border-left: 1px solid var(--line);
  padding-left: 1rem;
  display: flex;
  gap: 0.5rem;
}
.language-switch a[aria-current='true'] {
  font-weight: 750;
  text-decoration: underline;
  text-underline-offset: 0.35em;
}
main {
  min-height: 70vh;
}
.wrap {
  width: min(1160px, calc(100% - 3rem));
  margin: 0 auto;
}
.narrow {
  width: min(780px, calc(100% - 3rem));
  margin: 0 auto;
}
.hero {
  padding: clamp(2rem, 4vw, 4rem) 0 2.5rem;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.8fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: center;
}
.eyebrow {
  color: var(--accent-strong);
  font: 700 0.76rem/1.3 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
h1,
h2,
h3 {
  color: var(--ink);
  line-height: 1.12;
}
h1 {
  font: 600 clamp(2.1rem, 4vw, 3.4rem)/1.1 var(--sans);
  letter-spacing: -0.04em;
  margin: 0.85rem 0 1rem;
  max-width: 22ch;
}
h2 {
  font: 680 clamp(1.9rem, 3.6vw, 3rem)/1.16 var(--sans);
  letter-spacing: -0.04em;
  margin: 0 0 1rem;
}
h3 {
  font: 650 1.2rem/1.3 var(--sans);
  margin: 0 0 0.55rem;
}
.lead {
  font-size: clamp(1.1rem, 1.6vw, 1.3rem);
  color: var(--muted);
  max-width: 62ch;
}
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin: 2rem 0 0;
}
.button {
  display: inline-flex;
  min-height: 48px;
  padding: 0.72rem 1.05rem;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--accent-strong);
  background: var(--accent-strong);
  color: white;
  font-weight: 700;
  text-decoration: none;
}
.button:hover {
  background: #102f55;
  color: white;
}
.button.secondary {
  background: transparent;
  color: var(--accent-strong);
}
.button.secondary:hover {
  background: var(--accent-soft);
}
.hero-art {
  background-color: var(--surface);
  background-image:
    linear-gradient(to right, rgb(28 79 163 / 7%) 1px, transparent 1px),
    linear-gradient(to bottom, rgb(28 79 163 / 7%) 1px, transparent 1px);
  background-size: 24px 24px;
  border: 1px solid var(--line);
  padding: 1.2rem;
}
.hero-art img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
}
.image-caption {
  font: 0.72rem/1.5 var(--mono);
  color: var(--muted);
  margin: 0.8rem 0 0;
}
.proof-line {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.2rem;
  align-items: baseline;
  padding: 1rem 0;
  color: var(--muted);
  font-size: 0.9rem;
}
.proof-line strong {
  color: var(--ink);
  font: 700 0.72rem/1.2 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.section {
  padding: clamp(2.5rem, 4vw, 4rem) 0;
  border-bottom: 1px solid var(--line);
}
.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 0.65fr);
  gap: 2rem;
  align-items: end;
  margin-bottom: 1.75rem;
}
.section-heading p {
  margin: 0;
  color: var(--muted);
  max-width: 55ch;
}
.workflow-graphic {
  width: 100%;
  height: auto;
  margin: 0 0 2rem;
  border: 1px solid var(--line);
  background: var(--surface);
}
.flow-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.flow-step {
  padding: 1.45rem 1.35rem 1.6rem 0;
  margin-right: 1.35rem;
  border-right: 1px solid var(--line);
}
.flow-step:last-child {
  border-right: 0;
  margin-right: 0;
}
.step-number {
  color: var(--accent-strong);
  font: 700 0.78rem/1 var(--mono);
  display: block;
  margin-bottom: 1.1rem;
}
.flow-step p,
.feature p,
.content-section p,
.step-list p {
  color: var(--muted);
  margin: 0;
}
.split-section {
  display: grid;
  grid-template-columns: 0.75fr 1.25fr;
  gap: clamp(2rem, 8vw, 8rem);
  align-items: start;
}
.statement {
  border-left: 4px solid var(--accent);
  padding: 0.1rem 0 0.1rem 1.5rem;
}
.statement p {
  font-size: 1.15rem;
  color: var(--muted);
  margin: 0;
  max-width: 58ch;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.feature {
  padding: 1.5rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  min-height: 170px;
  background: var(--surface);
}
.feature-index {
  display: block;
  color: var(--accent-strong);
  font: 700 0.74rem/1 var(--mono);
  margin-bottom: 1.1rem;
}
.cta-band {
  background: var(--accent-soft);
  color: var(--ink);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  padding: clamp(2.5rem, 5vw, 4rem);
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
}
.cta-band h2 {
  color: var(--ink);
  max-width: 15ch;
}
.cta-band p {
  color: var(--muted);
  max-width: 54ch;
  margin-bottom: 0;
}
.cta-band .button {
  background: var(--accent-strong);
  color: #fff;
  border-color: var(--accent-strong);
  white-space: nowrap;
}
.page-hero {
  padding: clamp(2rem, 3.5vw, 3.25rem) 0 1.75rem;
  border-bottom: 1px solid var(--line);
}
.page-hero h1 {
  max-width: 26ch;
  font-size: clamp(2rem, 3.2vw, 2.75rem);
}
.content-section {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line);
}
.content-section h2 {
  font-size: clamp(1.65rem, 2.8vw, 2.35rem);
}
.content-section p {
  max-width: 74ch;
}
.guide-selection {
  padding: 2rem 0;
  border-top: 1px solid var(--line);
}
.guide-selection > p:not(.eyebrow) {
  color: var(--muted);
}
.guide-selection ol {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
}
.guide-selection li + li {
  border-left: 1px solid var(--line);
}
.guide-selection li a {
  display: flex;
  min-height: 100%;
  flex-direction: column;
  gap: 0.6rem;
  padding: 1.1rem;
  color: var(--ink);
  text-decoration: none;
}
.guide-selection li a:hover {
  background: var(--accent-soft);
}
.guide-selection li span {
  color: var(--accent);
  font: 700 0.68rem/1.4 var(--mono);
  text-transform: uppercase;
}
.guide-selection li strong {
  font-size: 1rem;
  line-height: 1.35;
}
.guide-selection li p {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.5;
}
.guide-hero {
  padding-bottom: 2rem;
}
.guide-hero h1 {
  max-width: 25ch;
}
.guide-section {
  padding-top: 2rem;
}
.guide-content {
  width: min(900px, calc(100% - 3rem));
  min-width: 0;
  max-width: 100%;
  overflow-x: clip;
  margin: 0 auto;
  padding: clamp(1.25rem, 4vw, 3rem);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  background: var(--surface);
  line-height: 1.72;
}
.guide-content > h2 {
  margin: 2.8rem 0 0.9rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  font-size: clamp(1.5rem, 2.8vw, 2rem);
}
.guide-content > h2:first-of-type {
  margin-top: 0;
  border-top: 0;
  padding-top: 0;
}
.guide-content > h3 {
  margin-top: 2rem;
  color: var(--accent-strong);
}
.guide-content p,
.guide-content li {
  max-width: 82ch;
}
.guide-content li + li {
  margin-top: 0.45rem;
}
.guide-content ul,
.guide-content ol {
  padding-left: 1.5rem;
}
.guide-content pre {
  overflow-x: auto;
  margin: 1.2rem 0 1.6rem;
  padding: 1rem 1.15rem;
  border-left: 3px solid var(--accent);
  background: var(--code);
  color: var(--code-ink);
  font-size: 0.84rem;
  line-height: 1.6;
}
.guide-content pre code {
  font-size: inherit;
}
.guide-content table {
  display: block;
  width: 100%;
  margin: 1.4rem 0 2rem;
  overflow-x: auto;
  border-collapse: collapse;
  font-size: 0.88rem;
}
.guide-content th,
.guide-content td {
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}
.guide-content th {
  background: var(--accent-soft);
}
.guide-content blockquote {
  margin: 1.6rem 0;
  padding: 0.85rem 1rem;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
}
.guide-content blockquote p {
  margin: 0;
}
.guide-source {
  margin-top: 3rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
}
.guide-language-note {
  margin-top: 0;
}
.step-list {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  counter-reset: site-step;
}
.step-list li {
  counter-increment: site-step;
  padding: 1.65rem 0 1.8rem 4rem;
  border-top: 1px solid var(--line);
  position: relative;
}
.step-list li::before {
  content: '0' counter(site-step);
  position: absolute;
  left: 0;
  top: 1.9rem;
  color: var(--accent-strong);
  font: 700 0.8rem/1 var(--mono);
}
.callout {
  margin: 2rem 0;
  padding: 1.1rem 1.25rem;
  border-left: 4px solid var(--warm);
  background: var(--accent-soft);
}
.callout p {
  margin: 0.45rem 0 0;
  color: var(--ink);
}
.code-block {
  background: var(--code);
  color: var(--code-ink);
  padding: 1.25rem 1.35rem;
  overflow-x: auto;
  border-left: 3px solid var(--accent);
  margin: 1.2rem 0;
}
.code-block code {
  font-size: 0.88rem;
  line-height: 1.8;
  white-space: pre;
}
.link-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1.4rem;
  margin: 1.5rem 0;
}
.product-source-links {
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}
.engineering-layout {
  display: grid;
  grid-template-columns: minmax(230px, 285px) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
  padding: 1rem 0 6rem;
}
.engineering-nav {
  position: sticky;
  top: 98px;
  max-height: calc(100vh - 118px);
  overflow: auto;
  align-self: start;
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent-strong);
  background: var(--surface);
  scrollbar-color: var(--line) transparent;
  scrollbar-width: thin;
}
.engineering-nav details {
  padding: 0.9rem 1rem 1rem;
}
.engineering-nav summary {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  align-items: baseline;
  color: var(--ink);
  font-size: 0.82rem;
  font-weight: 750;
  cursor: pointer;
  list-style: none;
}
.engineering-nav summary::-webkit-details-marker {
  display: none;
}
.engineering-nav summary::after {
  content: '−';
  color: var(--accent-strong);
  font: 0.9rem/1 var(--mono);
}
.engineering-nav details:not([open]) summary::after {
  content: '+';
}
.engineering-nav summary span {
  margin-left: auto;
  color: var(--muted);
  font: 0.68rem/1 var(--mono);
  font-weight: 400;
}
.engineering-nav ol {
  margin: 0.75rem -0.45rem 0;
  padding: 0;
  list-style: none;
}
.engineering-overview {
  display: block;
  margin: 0.7rem 0 0;
  padding: 0.55rem 0.45rem;
  border-left: 3px solid transparent;
  background: var(--paper);
  font-size: 0.76rem;
  font-weight: 700;
  text-decoration: none;
}
.engineering-overview:hover {
  border-left-color: var(--accent-strong);
  background: var(--accent-soft);
  text-decoration: none;
}
.engineering-nav li {
  border-top: 1px solid var(--line);
}
.engineering-nav li a {
  display: grid;
  grid-template-columns: 1.8rem 1fr;
  gap: 0.55rem;
  padding: 0.52rem 0.45rem;
  border-left: 3px solid transparent;
  text-decoration: none;
  color: var(--ink);
  font-size: 0.78rem;
  line-height: 1.35;
}
.engineering-nav .nav-no {
  font: 0.7rem/1.7 var(--mono);
  color: var(--accent-strong);
}
.engineering-nav li a:hover {
  color: var(--accent-strong);
  background: var(--accent-soft);
}
.engineering-nav li a[aria-current='page'] {
  border-left-color: var(--accent-strong);
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-weight: 700;
}
.engineering-decisions {
  display: block;
  margin: 0.65rem 0.35rem 0;
  padding: 0.65rem 0.1rem 0;
  border-top: 1px solid var(--line);
  font-size: 0.74rem;
  font-weight: 700;
  text-decoration: none;
}
.nav-adjacent-list,
.article-pagination {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}
.nav-adjacent-list {
  margin-top: 0.75rem;
}
.nav-adjacent {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: 0.22rem;
  padding: 0.58rem 0.65rem;
  border: 1px solid var(--line);
  background: var(--paper);
  text-decoration: none;
}
.nav-adjacent span {
  color: var(--muted);
  font: 0.63rem/1.3 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.nav-adjacent strong {
  overflow: hidden;
  color: var(--ink);
  font-size: 0.7rem;
  font-weight: 650;
  text-overflow: ellipsis;
}
.nav-adjacent:hover {
  border-color: var(--accent-strong);
  background: var(--accent-soft);
  text-decoration: none;
}
.nav-adjacent.disabled {
  border-color: transparent;
  background: transparent;
}
.engineering-content {
  min-width: 0;
}
.engineering-page-hero {
  padding: 2.2rem 0 1.4rem;
}
.engineering-page-hero h1 {
  margin: 0.65rem 0 0.7rem;
  max-width: 22ch;
  font-size: clamp(2.5rem, 5vw, 4.8rem);
}
.engineering-page-hero .lead {
  margin: 0;
  max-width: 78ch;
}
.engineering-content h2 {
  font-size: 1.7rem;
  margin-top: 2.6rem;
}
.engineering-content h3 {
  margin-top: 1.8rem;
}
.engineering-content p,
.engineering-content li {
  max-width: 78ch;
}
.engineering-content-inner {
  max-width: 82ch;
  margin: 0 auto;
  padding: clamp(1.4rem, 3.4vw, 2.6rem);
  border: 1px solid var(--line);
  background: var(--surface);
}
.engineering-content-inner > h2:first-child {
  margin-top: 0;
}
.engineering-endmatter {
  margin-top: 3.5rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
}
.engineering-endmatter .link-list {
  margin-bottom: 1.4rem;
}
.engineering-endmatter .article-pagination .nav-adjacent {
  padding: 0.8rem 0.9rem;
}
.engineering-endmatter .article-pagination .nav-adjacent strong {
  font-size: 0.82rem;
}
.engineering-content table {
  border-collapse: collapse;
  width: 100%;
  display: block;
  overflow-x: auto;
  margin: 1.3rem 0 2rem;
  font-size: 0.9rem;
  background: var(--surface);
}
.engineering-content th,
.engineering-content td {
  border: 1px solid var(--line);
  padding: 0.65rem 0.8rem;
  text-align: left;
  vertical-align: top;
}
.engineering-content th {
  background: var(--accent-soft);
  font-weight: 700;
}
.engineering-content pre {
  overflow-x: auto;
  background: var(--code);
  padding: 1rem;
  border-left: 3px solid var(--accent);
  font-size: 0.8rem;
  line-height: 1.55;
}
.architecture-figure {
  margin: 1.5rem 0 2rem;
}
.architecture-figure img {
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--surface);
}
.architecture-figure figcaption {
  color: var(--muted);
  font-size: 0.82rem;
  margin-top: 0.5rem;
}
.engineering-content blockquote {
  margin: 1rem 0;
  padding: 0.5rem 1rem;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  color: var(--muted);
}
.engineering-content hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 2rem 0;
}
.engineering-content .citation {
  color: var(--muted);
  font-size: 0.75rem;
}
.section-index {
  list-style: none;
  padding: 0;
  margin: 2rem 0;
  border-top: 1px solid var(--line);
}
.section-index li {
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr);
  gap: 1rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
}
.section-index .section-no {
  font: 700 0.82rem/1.6 var(--mono);
  color: var(--accent-strong);
}
.section-index a {
  font-weight: 700;
}
.section-index p {
  margin: 0.15rem 0 0;
  color: var(--muted);
}
.model-launch {
  max-width: 980px;
  margin: 2rem auto 0;
  padding: clamp(1.25rem, 3vw, 2rem);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  background-color: var(--surface);
  background-image:
    linear-gradient(to right, rgb(28 79 163 / 3%) 1px, transparent 1px),
    linear-gradient(to bottom, rgb(28 79 163 / 3%) 1px, transparent 1px);
  background-size: 28px 28px;
}
.model-launch > p {
  max-width: 72ch;
  margin-top: 0;
  color: var(--muted);
}
.model-launch .link-list {
  align-items: center;
  margin-bottom: 0;
}
.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--line);
  padding: 2rem 0;
}
.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(220px, 0.9fr);
  gap: 2rem 4rem;
  align-items: center;
  color: var(--muted);
  font-size: 0.85rem;
}
.footer-identities {
  display: flex;
  align-items: center;
  gap: clamp(1.3rem, 4vw, 3.2rem);
}
.footer-productshape {
  display: block;
  width: min(190px, 42%);
  flex: none;
  mix-blend-mode: multiply;
}
.footer-productshape img {
  display: block;
  width: 100%;
  height: auto;
}
.footer-methodology {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--ink);
  text-decoration: none;
}
.footer-methodology img {
  width: 52px;
  height: 52px;
  flex: none;
  border: 1px solid var(--line);
}
.footer-methodology span {
  display: grid;
  gap: 0.2rem;
}
.footer-methodology strong {
  max-width: 15ch;
  font: 600 0.82rem/1.25 var(--sans);
}
.footer-methodology small {
  color: var(--muted);
  font-size: 0.67rem;
  line-height: 1.35;
}
.footer-meta {
  justify-self: end;
}
.footer-inner p {
  margin: 0;
}
.footer-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.footer-links a {
  color: var(--ink);
}
.footer-meta .footer-links {
  margin-top: 0.8rem;
}
.breadcrumbs {
  color: var(--muted);
  font-size: 0.82rem;
  margin-bottom: 1.2rem;
}
.breadcrumbs a {
  color: var(--muted);
}
.source-stamp {
  display: inline-block;
  border: 1px solid var(--line);
  padding: 0.15rem 0.45rem;
  color: var(--muted);
  font: 0.7rem/1.5 var(--mono);
}
@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    padding-top: 4.5rem;
  }
  .hero-art {
    width: min(560px, 100%);
    margin-left: auto;
  }
  .section-heading {
    grid-template-columns: 1fr;
  }
  .header-inner {
    padding: 1rem 0;
    align-items: start;
  }
  .main-nav {
    gap: 0.65rem 1rem;
  }
}
@media (max-width: 680px) {
  .header-inner,
  .footer-inner,
  .wrap {
    width: min(100% - 2rem, 1160px);
  }
  .header-inner {
    display: block;
  }
  .brand {
    margin-bottom: 0.9rem;
  }
  .main-nav {
    justify-content: start;
  }
  .language-switch {
    border-left: 0;
    border-top: 1px solid var(--line);
    padding: 0.5rem 0 0;
    margin-top: 0.4rem;
  }
  .hero {
    padding: 3rem 0;
  }
  h1 {
    font-size: clamp(2.55rem, 13vw, 4rem);
  }
  .flow-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .flow-step:nth-child(2) {
    border-right: 0;
    margin-right: 0;
  }
  .flow-step:nth-child(3),
  .flow-step:nth-child(4) {
    border-top: 1px solid var(--line);
  }
  .feature-grid {
    grid-template-columns: 1fr;
  }
  .guide-selection ol {
    grid-template-columns: 1fr;
  }
  .guide-selection li + li {
    border-top: 1px solid var(--line);
    border-left: 0;
  }
  .feature {
    min-height: 0;
  }
  .split-section {
    grid-template-columns: 1fr;
  }
  .cta-band {
    display: block;
  }
  .cta-band .button {
    margin-top: 1.5rem;
  }
  .engineering-layout {
    grid-template-columns: 1fr;
    gap: 1rem;
    padding-top: 0.5rem;
  }
  .engineering-nav {
    position: static;
    max-height: none;
    overflow: visible;
  }
  .engineering-nav details {
    padding: 0.75rem 0.85rem;
  }
  .engineering-content-inner {
    padding: 1.2rem;
  }
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .footer-identities {
    justify-content: space-between;
    gap: 1rem;
  }
  .footer-meta {
    justify-self: start;
  }
  .footer-links {
    margin-top: 1rem;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* Public-site header follows the Product Snapshot header geometry and controls. */
.site-header {
  height: 2.9rem;
  background: var(--paper);
}
.header-inner {
  display: flex;
  align-items: center;
  width: 100%;
  min-height: 0;
  height: 100%;
  padding: 0 0.9rem;
  margin: 0;
  justify-content: flex-start;
  gap: 0.65rem;
}
.brand {
  flex: none;
  margin: 0;
  gap: 0.45rem;
  font-size: 0.98rem;
  font-weight: 400;
  letter-spacing: -0.005em;
}
.brand-icon {
  width: 1.65rem;
  height: 1.65rem;
}
.brand-title {
  white-space: nowrap;
}
.header-version {
  flex: none;
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 0.05rem 0.4rem;
  color: var(--muted);
  font: 0.74rem var(--mono);
  white-space: nowrap;
}
.main-nav {
  align-self: stretch;
  flex: none;
  align-items: center;
  flex-wrap: nowrap;
  justify-content: flex-start;
  gap: 0;
  padding: 0;
}
.main-nav a {
  align-self: stretch;
  padding: 0 0.7rem;
  border-bottom: 2px solid transparent;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 500;
}
.main-nav a:hover {
  color: var(--ink);
  text-decoration: none;
}
.main-nav a[aria-current='page'] {
  color: var(--ink);
  border-bottom-color: var(--accent-strong);
}
.language-switch {
  align-self: center;
  border-left: 1px solid var(--line);
  padding-left: 0.65rem;
  margin-left: 0.25rem;
}
.language-switch a {
  font-size: 0.82rem;
}
.language-switch a[aria-current='true'] {
  font-weight: 500;
  text-decoration: none;
}
.header-spacer {
  flex: 1 1 auto;
  min-width: 0.25rem;
}
.site-search {
  flex: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 15rem;
  height: 1.95rem;
  padding: 0 0.55rem;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  background: var(--surface);
  color: var(--muted);
  text-decoration: none;
}
.site-search:hover {
  border-color: var(--accent-strong);
  color: var(--ink);
  text-decoration: none;
}
.site-search svg {
  width: 1rem;
  height: 1rem;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-width: 1.8;
}
.site-search span {
  flex: 1;
  white-space: nowrap;
}
.site-search kbd {
  min-width: 1.3rem;
  text-align: center;
  font: 0.75rem var(--mono);
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  padding: 0.02rem 0.25rem;
  color: var(--muted);
  background: var(--paper);
}
.appearance-controls {
  display: inline-flex;
  align-items: stretch;
  float: none;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  background: var(--surface);
}
.appearance-controls button {
  min-width: 2.35rem;
  min-height: 1.95rem;
  padding: 0 0.5rem;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}
.appearance-controls button + button {
  border-left: 1px solid var(--line);
}
.appearance-controls button[aria-pressed='true'] {
  background: var(--accent-soft);
  color: var(--accent-strong);
}
.site-keys {
  flex: none;
  display: inline-grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border: 1px solid transparent;
  border-radius: 4px;
  color: var(--muted);
  text-decoration: none;
}
.site-keys:hover {
  border-color: var(--accent-strong);
  color: var(--ink);
  text-decoration: none;
}
@media (max-width: 76rem) {
  .site-search {
    min-width: 2.1rem;
    justify-content: center;
  }
  .site-search span,
  .site-search kbd {
    display: none;
  }
}
@media (max-width: 62rem) {
  .header-inner {
    gap: 0.35rem;
    padding: 0 0.6rem;
    overflow: hidden;
  }
  .main-nav {
    flex: 1 1 auto;
    min-width: 0;
    overflow-x: auto;
  }
  .main-nav a {
    padding: 0 0.45rem;
  }
  .main-nav [rel='external'],
  .language-switch {
    display: flex;
  }
  .header-version {
    display: none;
  }
}
@media (max-width: 34rem) {
  .header-inner {
    gap: 0.25rem;
    padding: 0 0.35rem;
  }
  .brand-title {
    display: none;
  }
  .brand-icon {
    width: 1.8rem;
    height: 1.8rem;
  }
  .main-nav a {
    padding: 0 0.35rem;
    font-size: 0.78rem;
  }
  .site-keys {
    display: none;
  }
  .appearance-controls button {
    min-width: 1.8rem;
    padding: 0 0.3rem;
  }
}

/* arc42 pages use the same fixed, compact navigation pane as the Product Snapshot. */
.engineering-layout {
  display: grid;
  grid-template-columns: minmax(225px, 18.5rem) minmax(0, 1fr);
  gap: 0;
  align-items: stretch;
  width: 100%;
  min-height: calc(100vh - 2.9rem);
  margin: 0;
  padding: 0;
}
.engineering-nav {
  position: sticky;
  top: 2.9rem;
  display: flex;
  flex-direction: column;
  align-self: start;
  height: calc(100vh - 2.9rem);
  max-height: none;
  min-height: 0;
  overflow: hidden;
  border: 0;
  border-right: 1px solid var(--line-strong);
  background: var(--surface);
}
.engineering-nav-head {
  flex: none;
  display: flex;
  align-items: center;
  gap: 0.55rem;
  height: 2.4rem;
  padding: 0 0.35rem 0 0.75rem;
  border-bottom: 1px solid var(--line);
}
.engineering-nav-head h2 {
  margin: 0;
  color: var(--ink);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}
.engineering-nav-head span {
  margin-left: 0;
  color: var(--muted);
  font: 0.74rem var(--mono);
}
.engineering-listwrap {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  scrollbar-color: var(--line-strong) transparent;
  scrollbar-width: thin;
}
.engineering-nav ol {
  margin: 0;
  padding: 0;
  list-style: none;
}
.engineering-nav li {
  border-bottom: 1px solid var(--line);
}
.engineering-nav li a {
  display: grid;
  grid-template-columns: 0.7rem auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.45rem;
  min-height: 2.55rem;
  padding: 0.42rem 0.6rem 0.42rem 0.45rem;
  border: 0;
  color: var(--ink);
  font-size: 0.8rem;
  font-weight: 600;
  line-height: 1.25;
  text-decoration: none;
}
.engineering-chev {
  color: var(--muted);
  font: 1.2rem/1 var(--sans);
}
.engineering-token {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  flex: none;
  padding: 0 0.28em;
  border: 1px solid color-mix(in srgb, var(--section-color, var(--accent-strong)) 45%, transparent);
  border-radius: 3px;
  color: var(--section-color, var(--accent-strong));
  font: 700 0.66rem/1.35 var(--mono);
  letter-spacing: 0.03em;
  white-space: nowrap;
}
.ic {
  width: 1rem;
  height: 1rem;
  flex: none;
  vertical-align: -0.18em;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.engineering-nav-title {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}
.engineering-number {
  color: var(--muted);
  font: 0.74rem var(--mono);
  font-variant-numeric: tabular-nums;
}
.engineering-layout
  a:is([data-section='01'], [data-section='02'], [data-section='03'], [data-section='10']) {
  --section-color: var(--section-requirements);
}
.engineering-layout a:is([data-section='05'], [data-section='06'], [data-section='07']) {
  --section-color: var(--section-structures);
}
.engineering-layout a:is([data-section='04'], [data-section='08'], [data-section='09']) {
  --section-color: var(--section-concepts);
}
.engineering-layout a:is([data-section='11'], [data-section='12']) {
  --section-color: var(--section-reference);
}
.engineering-nav li a:hover {
  background: color-mix(in srgb, var(--surface) 82%, var(--line-strong));
  color: var(--ink);
}
.engineering-nav li a[aria-current='page'] {
  background: color-mix(in srgb, var(--section-color, var(--accent-strong)) 10%, var(--surface));
  color: var(--ink);
  font-weight: 600;
  box-shadow: inset 3px 0 0 var(--section-color, var(--accent-strong));
}
.engineering-attribution {
  flex: none;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  min-height: 2.2rem;
  padding: 0 0.7rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.68rem;
  text-decoration: none;
}
.engineering-attribution:hover {
  color: var(--accent-strong);
  text-decoration: none;
}
.engineering-info {
  display: inline-grid;
  place-items: center;
  width: 0.9rem;
  height: 0.9rem;
  border: 1px solid currentColor;
  border-radius: 50%;
  font: 600 0.62rem/1 sans-serif;
}
.engineering-content {
  min-width: 0;
  padding: 1.35rem clamp(1.2rem, 3vw, 2.5rem) 4rem;
}
.engineering-content-inner {
  max-width: 82ch;
  margin: 0 auto;
  padding: 0;
  border: 0;
  background: transparent;
}
.engineering-title {
  margin: 0 0 1.5rem;
  color: var(--ink);
  font-size: clamp(2rem, 4vw, 3.25rem);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.035em;
}
.engineering-content-inner > h2:first-child {
  margin-top: 0;
}
.engineering-overview-inner {
  width: min(1160px, 100%);
  margin: 0 auto;
}
.engineering-overview-heading {
  margin: 0 0 1.6rem;
  text-align: center;
}
.engineering-overview-heading h1 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 650;
  line-height: 1.1;
  letter-spacing: -0.035em;
}
.engineering-overview-heading > p:last-child {
  max-width: 66ch;
  margin: 0.55rem auto 0;
  color: var(--muted);
}
.engineering-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
}
.engineering-card {
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr);
  align-items: start;
  gap: 0.75rem;
  min-height: 6rem;
  padding: 0.85rem;
  border: 1px solid color-mix(in srgb, var(--section-color) 17%, var(--line));
  border-radius: 5px;
  background: color-mix(in srgb, var(--section-color) 8%, var(--surface));
  color: var(--ink);
  text-decoration: none;
}
.engineering-card:hover {
  border-color: color-mix(in srgb, var(--section-color) 58%, var(--line));
  color: var(--ink);
  text-decoration: none;
}
.engineering-card-icon {
  display: grid;
  place-items: center;
  width: 2.15rem;
  height: 2.15rem;
  border: 1px solid color-mix(in srgb, var(--section-color) 28%, transparent);
  border-radius: 50%;
  background: color-mix(in srgb, var(--section-color) 13%, var(--surface));
  color: var(--section-color);
}
.engineering-card-icon .ic {
  width: 1.1rem;
  height: 1.1rem;
}
.engineering-card-copy {
  display: grid;
  justify-items: start;
  gap: 0.16rem;
  min-width: 0;
}
.engineering-card-code {
  color: var(--section-color);
  font: 700 0.66rem/1.3 var(--mono);
  letter-spacing: 0.04em;
}
.engineering-card-copy strong {
  font-size: 0.98rem;
  line-height: 1.3;
}
.engineering-card-description {
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.45;
}
.engineering-legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem 1.4rem;
  margin: 0.65rem 0 0;
  padding: 0;
  color: var(--muted);
  font-size: 0.84rem;
  list-style: none;
}
.engineering-legend li {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.engineering-legend-swatch {
  flex: none;
  width: 0.78rem;
  height: 0.78rem;
  border-radius: 50%;
}
.engineering-legend-swatch[data-family='requirements'] {
  background: var(--section-requirements);
}
.engineering-legend-swatch[data-family='structures'] {
  background: var(--section-structures);
}
.engineering-legend-swatch[data-family='concepts'] {
  background: var(--section-concepts);
}
.engineering-legend-swatch[data-family='reference'] {
  background: var(--section-reference);
}
@media (max-width: 48rem) {
  .engineering-layout {
    grid-template-columns: minmax(0, 1fr);
    min-height: 0;
  }
  .engineering-nav {
    position: static;
    height: auto;
    max-height: 15rem;
    border-right: 0;
    border-bottom: 1px solid var(--line-strong);
  }
  .engineering-content {
    padding: 1.2rem 1rem 3rem;
  }
  .engineering-overview-heading {
    text-align: left;
  }
  .engineering-overview-heading > p:last-child {
    margin-left: 0;
  }
  .engineering-cards {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* Keep the public shell readable at every width. The desktop toolbar stays in
   one row; compact screens get a brand/actions row and a scrollable nav row. */
@media (max-width: 64rem) {
  .site-header {
    height: auto;
  }
  .header-inner {
    gap: 0.35rem;
    padding-inline: 0.65rem;
  }
  .header-version {
    display: none;
  }
  .main-nav {
    flex: 1 1 auto;
    min-width: 0;
    overflow-x: auto;
    overscroll-behavior-inline: contain;
    scrollbar-width: none;
  }
  .main-nav::-webkit-scrollbar {
    height: 2px;
  }
  .main-nav {
    scrollbar-width: thin;
    scrollbar-color: var(--line-strong) transparent;
  }
  .main-nav::-webkit-scrollbar-thumb {
    background: var(--line-strong);
  }
  .main-nav [rel='external'],
  .language-switch {
    display: flex;
  }
  .site-search {
    min-width: 2.1rem;
    justify-content: center;
  }
  .site-search span,
  .site-search kbd {
    display: none;
  }
}

@media (max-width: 48rem) {
  .header-inner {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto auto;
    grid-template-areas:
      'brand spacer search appearance'
      'nav nav nav nav';
    gap: 0 0.5rem;
    height: auto;
    min-height: 0;
    padding: 0.4rem 0.75rem 0;
    overflow: visible;
  }
  .brand {
    grid-area: brand;
    gap: 0.4rem;
    font-size: 0.95rem;
  }
  .brand-title {
    display: inline;
  }
  .brand-icon {
    width: 1.55rem;
    height: 1.55rem;
  }
  .header-spacer {
    grid-area: spacer;
    display: block;
  }
  .site-search {
    grid-area: search;
    width: 2rem;
    min-width: 2rem;
    height: 2rem;
    padding: 0;
  }
  .appearance-controls {
    grid-area: appearance;
  }
  .appearance-controls button {
    min-width: 1.85rem;
    min-height: 2rem;
    padding-inline: 0.3rem;
  }
  .site-keys {
    display: none;
  }
  .main-nav {
    grid-area: nav;
    width: auto;
    margin: 0 -0.5rem;
    padding: 0 0.45rem;
    min-height: 2.45rem;
    border-top: 1px solid var(--line);
    overflow-x: auto;
    overflow-y: hidden;
    justify-content: flex-start;
    scrollbar-width: thin;
    scrollbar-color: var(--line-strong) transparent;
  }
  .main-nav::-webkit-scrollbar {
    height: 2px;
  }
  .main-nav::-webkit-scrollbar-thumb {
    background: var(--line-strong);
  }
  .main-nav a {
    display: inline-flex;
    align-items: center;
    flex: none;
    padding: 0 0.55rem;
    white-space: nowrap;
  }
  .main-nav a[rel='external'],
  .language-switch {
    display: flex;
  }
  .language-switch {
    align-self: center;
    border-left: 1px solid var(--line);
    padding-left: 0.6rem;
    margin-left: 0.2rem;
  }
  .language-switch a {
    align-self: center;
    padding: 0 0.35rem;
    white-space: nowrap;
  }
  .hero {
    padding: clamp(1.75rem, 7vw, 2.5rem) 0;
    gap: 1.25rem;
  }
  .hero h1 {
    max-width: 19ch;
    font-size: clamp(2rem, 8vw, 2.5rem);
  }
  .hero .lead {
    margin-top: 0.75rem;
    font-size: 1.08rem;
    line-height: 1.55;
  }
  .page-hero {
    padding-block: 1.6rem 1.25rem;
  }
  .content-section {
    padding-block: 1.25rem;
  }
  .engineering-layout {
    gap: 0;
  }
  .engineering-nav {
    height: auto;
    max-height: none;
    overflow: hidden;
    border-right: 0;
    border-bottom: 1px solid var(--line-strong);
  }
  .engineering-nav-head {
    height: 2.2rem;
    min-height: 2.2rem;
    padding-inline: 0.75rem;
  }
  .engineering-listwrap {
    flex: none;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: thin;
    overscroll-behavior-inline: contain;
  }
  .engineering-listwrap::-webkit-scrollbar {
    height: 2px;
  }
  .engineering-listwrap::-webkit-scrollbar-thumb {
    background: var(--line-strong);
  }
  .engineering-nav ol {
    display: flex;
    width: max-content;
    min-width: 100%;
    padding: 0.35rem 0.5rem;
    gap: 0.35rem;
  }
  .engineering-nav li {
    flex: none;
    border: 0;
  }
  .engineering-nav li a {
    display: flex;
    min-height: 2.5rem;
    gap: 0.4rem;
    padding: 0.35rem 0.55rem;
    border: 1px solid var(--line);
    border-radius: 3px;
    white-space: nowrap;
  }
  .engineering-nav li a[aria-current='page'] {
    box-shadow: inset 0 -2px 0 var(--section-color, var(--accent-strong));
  }
  .engineering-nav .engineering-number {
    margin-left: 0.1rem;
  }
  .engineering-attribution {
    min-height: 1.9rem;
    align-self: flex-start;
    border-top: 0;
    padding-inline: 0.75rem;
  }
  .engineering-attribution span:last-child {
    white-space: nowrap;
  }
  .engineering-cards {
    gap: 0.65rem;
  }
  .engineering-card {
    padding: 0.9rem;
  }
  .engineering-legend {
    flex-wrap: wrap;
    gap: 0.35rem 0.8rem;
  }
  .wrap,
  .footer-inner,
  .narrow {
    width: min(100% - 1.5rem, 1160px);
  }
  .button,
  .actions .button {
    max-width: 100%;
  }
}

@media (max-width: 22rem) {
  .header-version {
    display: none;
  }
  .header-inner {
    grid-template-columns: auto minmax(0, 1fr) auto auto;
    column-gap: 0.3rem;
    padding-inline: 0.5rem;
  }
  .brand {
    gap: 0.3rem;
    font-size: 0.88rem;
  }
  .brand-icon {
    width: 1.4rem;
    height: 1.4rem;
  }
  .appearance-controls button {
    min-width: 1.65rem;
    padding-inline: 0.2rem;
  }
}