:root {
  --paper: #f4f2eb;
  --surface: #fffdf8;
  --surface-raised: #ffffff;
  --ink: #202522;
  --muted: #626a64;
  --line: #d7d7ce;
  --accent: #b64f38;
  --signal: #356f50;
  --warning: #a7472f;
  --component-accent: var(--accent);
  --component-wash: #f8f5ee;
  --font-body: "Avenir Next", Avenir, "Segoe UI", sans-serif;
  --font-display: "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --font-meta: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --page-width: 980px;
  --reading-width: 78ch;
  --body-size: 16px;
  --body-leading: 1.65;
  --section-space: 32px;
  --component-space: 20px;
  --page-gutter: 36px;
  --corner: 2px;
  --soft-shadow: 0 18px 48px rgb(32 37 34 / 8%);
}

* {
  box-sizing: border-box;
  min-width: 0;
  letter-spacing: 0;
}

html {
  color: var(--ink);
  background: var(--paper);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  overflow-wrap: anywhere;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgb(53 111 80 / 4%) 1px, transparent 1px) 0 0 / 34px 34px,
    var(--paper);
  font-family: var(--font-body);
  font-size: var(--body-size);
  line-height: var(--body-leading);
}

body[data-color-tokens="reference-neutral-v1"] {
  --paper: #f2f4f5;
  --surface: #ffffff;
  --surface-raised: #ffffff;
  --ink: #20282d;
  --muted: #5d6970;
  --line: #d1d8dc;
  --accent: #355d75;
  --signal: #4b6758;
  --component-wash: #f4f7f8;
}

body[data-color-tokens="signal-v1"] {
  --paper: #eef3ec;
  --surface: #fbfdf9;
  --surface-raised: #ffffff;
  --ink: #1c2921;
  --muted: #58675e;
  --line: #cbd7ce;
  --accent: #a84d2f;
  --signal: #236445;
  --component-wash: #edf5ee;
}

body[data-typography="reference-sans"] {
  --font-body: "Gill Sans", "Trebuchet MS", Calibri, sans-serif;
  --font-display: "Gill Sans", "Trebuchet MS", Calibri, sans-serif;
  --body-leading: 1.58;
}

body[data-typography="technical-readable"] {
  --font-body: Charter, "Bitstream Charter", "Sitka Text", Georgia, serif;
  --font-display: "Avenir Next Condensed", "Franklin Gothic Medium", sans-serif;
  --font-meta: "SFMono-Regular", Consolas, monospace;
  --body-leading: 1.7;
}

body[data-density="compact"] {
  --section-space: 22px;
  --component-space: 14px;
  --body-size: 15px;
  --body-leading: 1.55;
}

body[data-density="spacious"] {
  --section-space: 46px;
  --component-space: 26px;
  --body-size: 17px;
  --body-leading: 1.72;
}

body[data-architecture-shell="column"] {
  --page-width: 980px;
  --reading-width: 76ch;
}

body[data-architecture-shell="rail"] {
  --page-width: 1180px;
  --reading-width: 72ch;
}

body[data-architecture-shell="split"] {
  --page-width: 1160px;
  --reading-width: 66ch;
}

body[data-architecture-shell="wide"] {
  --page-width: 1320px;
  --reading-width: 82ch;
}

body[data-architecture-rhythm="chaptered"] {
  --section-space: 48px;
}

body[data-architecture-rhythm="dense"] {
  --section-space: 22px;
  --component-space: 14px;
}

body[data-architecture-rhythm="open"] {
  --section-space: 58px;
  --component-space: 28px;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  text-decoration-thickness: 2px;
}

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

img {
  display: block;
  max-width: 100%;
  height: auto;
}

.site-header,
main,
footer {
  width: min(var(--page-width), calc(100% - var(--page-gutter)));
  margin-inline: auto;
}

.site-header {
  min-height: 68px;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--line);
}

.site-name {
  color: var(--ink);
  font-family: var(--font-meta);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  text-transform: uppercase;
}

main {
  padding-block: clamp(36px, 6vw, 72px) clamp(64px, 9vw, 112px);
}

article {
  min-width: 0;
}

.article-hero {
  max-width: 860px;
  margin-bottom: calc(var(--section-space) * 0.9);
}

.topic-kicker {
  margin: 0 0 10px;
  color: var(--signal);
  font-family: var(--font-meta);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  line-height: 1.13;
  text-wrap: balance;
}

h1 {
  max-width: 780px;
  margin: 0;
  font-size: clamp(38px, 6vw, 62px);
  font-weight: 620;
  letter-spacing: -0.025em;
}

h2 {
  margin: 0 0 14px;
  font-size: clamp(25px, 3.4vw, 34px);
  font-weight: 620;
}

h3 {
  margin: 14px 0 5px;
  font-size: 22px;
}

h4 {
  margin: 16px 0 6px;
  font-size: 16px;
}

.direct-answer {
  max-width: 720px;
  margin: 20px 0 0;
  padding-inline-start: 20px;
  border-inline-start: 3px solid var(--component-accent);
  color: #343d38;
  font-size: clamp(18px, 2vw, 21px);
  line-height: 1.55;
}

.section-navigation {
  margin: 0 0 calc(var(--section-space) * 1.05);
  padding: 15px 18px;
  border-block: 1px solid var(--line);
  background: rgb(255 253 248 / 62%);
}

.section-navigation ol {
  margin: 0;
  padding-inline-start: 20px;
  columns: 2;
  column-gap: 36px;
}

.section-navigation li {
  min-height: 34px;
  break-inside: avoid;
  padding-block: 3px;
}

.section-navigation a {
  display: inline-flex;
  min-height: 32px;
  align-items: center;
}

article > section {
  padding-block: var(--section-space);
  border-top: 1px solid var(--line);
}

article > section p {
  max-width: var(--reading-width);
  margin: 0;
  white-space: pre-line;
}

.scenario {
  margin: calc(var(--section-space) * 0.5) 0 calc(var(--section-space) * 1.2);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--corner);
  background: var(--surface);
}

.scenario img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.scenario figcaption {
  padding: 11px 15px;
  color: var(--muted);
  font-size: 13px;
}

.decision-matrix,
.decision-checklist,
.evidence-note,
.source-block,
.disclosure-slot,
.closing-recap,
.closing-product-rail,
.closing-links {
  margin: var(--section-space) 0;
  padding: var(--component-space);
  border-inline-start: 4px solid var(--component-accent);
  background: var(--component-wash);
}

.decision-matrix > p,
.decision-checklist > p,
.evidence-note > p,
.source-block > p,
.disclosure-slot > p {
  margin: 0;
}

.source-block {
  border: 1px solid var(--line);
  border-inline-start-width: 4px;
  border-radius: var(--corner);
}

.disclosure-slot .affiliate-disclosure {
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  font-weight: 700;
}

.source-list {
  margin: 16px 0 0;
  padding-inline-start: 20px;
}

.source-list li + li {
  margin-top: 12px;
}

.source-list p {
  color: var(--muted);
  font-size: 13px;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.product-layer {
  margin-block: var(--section-space);
}

.product-card-stack .product-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

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

.related-cluster ul,
.closing-links ul,
.closing-product-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.related-cluster a,
.closing-links a,
.closing-product-list a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
}

.site-disclosure {
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 24px var(--page-gutter) 40px;
  color: var(--muted);
  font-family: var(--font-meta);
  font-size: 12px;
}

.product-card {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--corner);
  background: var(--surface);
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.product-card:hover {
  border-color: var(--component-accent);
  box-shadow: var(--soft-shadow);
  transform: translateY(-2px);
}

.product-card > a {
  height: 100%;
  display: block;
  padding: 17px;
  color: var(--ink);
  text-decoration: none;
}

.product-card img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: contain;
  background: #edf0ec;
}

.product-card p,
.product-card ul {
  color: var(--muted);
  font-size: 14px;
}

.product-card li + li {
  margin-top: 5px;
}

nav[aria-label="Related references"] {
  padding-block: var(--section-space);
  border-top: 1px solid var(--line);
}

nav[aria-label="Related references"] ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 22px;
  padding-inline-start: 20px;
}

footer {
  padding-block: 26px 44px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

/* Controlled page-level composition profiles. */

body[data-layout-family="editorial-rail"] .article-hero {
  max-width: 1020px;
}

body[data-layout-family="editorial-rail"] h1 {
  max-width: 920px;
}

body[data-layout-family="decision-first"] .decision-boundary {
  border-width: 0 0 0 6px;
  box-shadow: var(--soft-shadow);
  font-size: 1.08em;
}

body[data-layout-family="field-guide"] article > section {
  margin-block: 12px;
  padding-inline: clamp(16px, 3vw, 32px);
  border: 1px solid var(--line);
  background: rgb(255 253 248 / 70%);
}

body[data-architecture-shell="rail"] main > article {
  display: grid;
  grid-template-columns: minmax(190px, 240px) minmax(0, 1fr);
  column-gap: clamp(28px, 5vw, 72px);
}

body[data-architecture-shell="rail"] main > article > * {
  grid-column: 2;
}

body[data-architecture-shell="rail"] main > article > .article-hero {
  max-width: none;
  grid-column: 1 / -1;
}

body[data-architecture-shell="rail"] main > article > .section-navigation {
  position: sticky;
  top: 20px;
  grid-column: 1;
  grid-row: 2 / span 6;
  align-self: start;
  margin: 0;
  padding: 18px 0 18px 18px;
  border-block: 0;
  border-inline-start: 2px solid var(--component-accent);
  background: transparent;
}

body[data-architecture-shell="rail"] main > article > .section-navigation ol {
  columns: 1;
  padding-inline-start: 18px;
}

body[data-architecture-shell="split"] main > article {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: clamp(24px, 5vw, 64px);
}

body[data-architecture-shell="split"] main > article > * {
  grid-column: 1 / -1;
}

body[data-architecture-shell="split"] main > article > section:not([aria-labelledby="products"]) {
  grid-column: auto;
  align-self: stretch;
}

body[data-architecture-shell="wide"] .product-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

body[data-architecture-shell="wide"] main > article > section:not([aria-labelledby="products"]),
body[data-architecture-shell="wide"] .decision-boundary,
body[data-architecture-shell="wide"] .evidence-note {
  max-width: 1040px;
}

body[data-architecture-rhythm="chaptered"] article > section > h2::before {
  content: "§";
  display: block;
  margin-bottom: 8px;
  color: var(--component-accent);
  font-family: var(--font-meta);
  font-size: 13px;
}

body[data-architecture-rhythm="dense"] .section-navigation {
  margin-bottom: 18px;
}

body[data-architecture-rhythm="open"] .article-hero {
  margin-bottom: 52px;
}

body[data-architecture-accent="left"] article > section {
  padding-inline-start: clamp(16px, 2.4vw, 30px);
  border-top: 0;
  border-inline-start: 1px solid var(--line);
}

body[data-architecture-accent="top"] article > section {
  border-top: 3px solid var(--component-accent);
}

/* Every registry entry resolves to a controlled presentation descriptor. */

[data-component-id] {
  --component-accent: var(--accent);
  --component-wash: #f8f5ee;
}

[data-component-accent="0"] { --component-accent: #a84832; }
[data-component-accent="1"] { --component-accent: #a76620; }
[data-component-accent="2"] { --component-accent: #77722b; }
[data-component-accent="3"] { --component-accent: #36704f; }
[data-component-accent="4"] { --component-accent: #28716d; }
[data-component-accent="5"] { --component-accent: #3d6981; }
[data-component-accent="6"] { --component-accent: #475d79; }
[data-component-accent="7"] { --component-accent: #685a7d; }
[data-component-accent="8"] { --component-accent: #85536b; }
[data-component-accent="9"] { --component-accent: #9b4e55; }
[data-component-accent="10"] { --component-accent: #ad5c3e; }
[data-component-accent="11"] { --component-accent: #5d6d68; }

[data-component-emphasis="warning"] {
  --component-accent: var(--warning);
  --component-wash: #fbede7;
}

[data-component-emphasis="signal"] {
  --component-accent: var(--signal);
  --component-wash: #eaf2eb;
}

[data-component-emphasis="contrast"] {
  --component-wash: #e8ece8;
}

[data-component-emphasis="accent"] {
  --component-wash: #f7ede8;
}

[data-component-frame="card"] {
  padding: var(--component-space);
  border: 1px solid var(--line);
  border-radius: clamp(10px, 1.5vw, 18px);
  background: var(--surface-raised);
  box-shadow: var(--soft-shadow);
}

[data-component-frame="band"] {
  padding: var(--component-space);
  border-block: 1px solid var(--component-accent);
  background: var(--component-wash);
}

[data-component-frame="line"] {
  padding-inline-start: var(--component-space);
  border-inline-start: 4px solid var(--component-accent);
}

[data-component-alignment="center"] > h1,
[data-component-alignment="center"] > h2,
[data-component-alignment="center"] > .topic-kicker,
[data-component-alignment="center"] > .direct-answer {
  margin-inline: auto;
  text-align: center;
}

article > [data-component-alignment="offset"] {
  margin-inline-start: min(6vw, 72px);
}

[data-component-alignment="tight"] {
  max-width: 720px;
}

[data-component-layout="split"] {
  --split-gap: clamp(22px, 4vw, 56px);
}

.article-hero[data-component-layout="split"] {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.8fr);
  gap: 12px var(--split-gap);
  align-items: end;
}

.article-hero[data-component-layout="split"] .topic-kicker {
  grid-column: 1 / -1;
}

.article-hero[data-component-layout="split"] .direct-answer {
  margin-top: 0;
}

article > section[data-component-layout="split"] {
  display: grid;
  grid-template-columns: minmax(180px, 0.72fr) minmax(0, 1.28fr);
  gap: var(--split-gap);
  align-items: start;
}

article > section[data-component-layout="split"] > h2 {
  position: sticky;
  top: 20px;
}

.scenario[data-component-layout="split"] {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(220px, 0.55fr);
  align-items: stretch;
}

.scenario[data-component-layout="split"] img {
  height: 100%;
}

.scenario[data-component-layout="split"] figcaption {
  display: flex;
  align-items: end;
  padding: clamp(18px, 3vw, 34px);
  border-inline-start: 1px solid var(--line);
  font-size: 15px;
}

article > section[data-component-layout="grid"] .product-grid,
nav[data-component-layout="grid"] ul,
.section-navigation[data-component-layout="grid"] ol {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  columns: auto;
  padding-inline-start: 0;
  list-style-position: inside;
}

[data-component-layout="rail"] {
  border-inline-start: 5px solid var(--component-accent);
}

.section-navigation[data-component-layout="rail"] {
  position: sticky;
  top: 18px;
}

[data-component-layout="band"] {
  width: auto;
  background: var(--component-wash);
}

.section-navigation[data-component-layout="pills"] ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  columns: auto;
  padding: 0;
  list-style: none;
}

.section-navigation[data-component-layout="pills"] li {
  min-height: 0;
  padding: 0;
}

.section-navigation[data-component-layout="pills"] a {
  min-height: 44px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  text-decoration: none;
}

[data-component-layout="compact"] {
  --component-space: 12px;
  --section-space: 20px;
}

.section-navigation[data-component-layout="accordion"] ol {
  columns: 1;
}

.section-navigation[data-component-layout="accordion"] li {
  border-bottom: 1px solid var(--line);
}

[data-component-layout="steps"] ol,
[data-component-layout="steps"] .section-checklist {
  list-style: none;
  counter-reset: reference-step;
}

[data-component-layout="steps"] li {
  position: relative;
  padding-inline-start: 38px;
  counter-increment: reference-step;
}

[data-component-layout="steps"] li::before {
  content: counter(reference-step, decimal-leading-zero);
  position: absolute;
  inset-inline-start: 0;
  color: var(--component-accent);
  font-family: var(--font-meta);
  font-size: 12px;
  font-weight: 700;
}

/* Physical-family behavior. */

[data-component-family="HeroShell"][data-component-emphasis="warning"] .direct-answer {
  color: #6f2f24;
}

[data-component-family="MediaBlock"] {
  border-color: var(--component-accent);
}

[data-component-family="ProductRail"] .product-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

[data-component-family="ProductRail"].closing-product-rail {
  border-block: 1px solid var(--line);
  border-inline-start-width: 0;
}

[data-component-family="ProductCard"] .product-card:first-child {
  border-top: 4px solid var(--component-accent);
}

[data-component-family="DecisionMatrix"],
[data-component-family="Checklist"] {
  --component-wash: #f6f2e8;
}

[data-component-family="EvidenceNote"],
[data-component-family="SourceBlock"] {
  --component-wash: #eaf2eb;
}

[data-component-family="InternalLinkCluster"] a {
  text-decoration-color: var(--component-accent);
}

[data-component-family="DisclosureSlot"] {
  font-family: var(--font-meta);
  font-size: 12px;
}

.section-evidence-note,
.section-source-block {
  padding: var(--component-space);
  border-inline-start: 4px solid var(--component-accent);
  background: var(--component-wash);
}

.section-source-block {
  border-block: 1px solid var(--line);
  border-inline-end: 1px solid var(--line);
  border-radius: var(--corner);
}

.faq-section {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
}

.faq-section summary {
  min-height: 48px;
  padding: 14px 48px 14px 16px;
  cursor: pointer;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 620;
}

.faq-section p {
  padding: 0 16px 18px;
}

.section-matrix-scroll {
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
}

.section-matrix {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}

.section-matrix th,
.section-matrix td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  text-align: start;
  vertical-align: top;
}

.section-matrix tr:last-child th,
.section-matrix tr:last-child td {
  border-bottom: 0;
}

.section-matrix th {
  width: min(30%, 220px);
  color: var(--signal);
  font-family: var(--font-meta);
  font-size: 12px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.section-checklist {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.section-checklist li {
  position: relative;
  min-height: 44px;
  padding: 10px 12px 10px 42px;
  border-bottom: 1px solid var(--line);
}

.section-checklist li::before {
  content: "✓";
  position: absolute;
  inset-inline-start: 12px;
  color: var(--component-accent);
  font-family: var(--font-meta);
  font-weight: 800;
}

@media (max-width: 920px) {
  body[data-architecture-shell="rail"] main > article,
  body[data-architecture-shell="split"] main > article {
    display: block;
  }

  body[data-architecture-shell="rail"] main > article > *,
  body[data-architecture-shell="rail"] main > article > .article-hero,
  body[data-architecture-shell="rail"] main > article > .section-navigation,
  body[data-architecture-shell="split"] main > article > *,
  body[data-architecture-shell="split"] main > article > section:not([aria-labelledby="products"]) {
    display: revert;
    grid-column: auto;
    grid-row: auto;
  }

  body[data-architecture-shell="rail"] main > article > .section-navigation,
  .section-navigation[data-component-layout="rail"] {
    position: static;
    margin-bottom: var(--section-space);
    padding: 15px 18px;
    border-block: 1px solid var(--line);
    border-inline-start-width: 3px;
    background: rgb(255 253 248 / 72%);
  }

  body[data-architecture-shell="wide"] .product-grid,
  [data-component-family="ProductRail"] .product-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  article > [data-component-alignment="offset"] {
    margin-inline-start: 0;
  }
}

@media (max-width: 720px) {
  :root {
    --page-gutter: 28px;
    --section-space: 27px;
    --component-space: 16px;
  }

  body {
    background: var(--paper);
  }

  main {
    padding-block: 34px 60px;
  }

  .article-hero[data-component-layout="split"],
  article > section[data-component-layout="split"],
  .scenario[data-component-layout="split"] {
    display: block;
  }

  article > section[data-component-layout="split"] > h2 {
    position: static;
  }

  .article-hero[data-component-layout="split"] .direct-answer {
    margin-top: 18px;
  }

  .scenario[data-component-layout="split"] figcaption {
    border-inline-start: 0;
    border-top: 1px solid var(--line);
  }

  article > section[data-component-layout="grid"] .product-grid,
  nav[data-component-layout="grid"] ul,
  .section-navigation[data-component-layout="grid"] ol,
  nav[aria-label="Related references"] ul {
    grid-template-columns: 1fr;
  }

  .section-navigation ol {
    columns: 1;
  }

  .product-grid,
  body[data-architecture-shell="wide"] .product-grid,
  [data-component-family="ProductRail"] .product-grid {
    grid-template-columns: 1fr;
  }

  [data-component-frame="card"],
  [data-component-frame="band"] {
    padding: 16px;
  }

  body[data-architecture-accent="left"] article > section {
    padding-inline-start: 16px;
  }

  .section-matrix,
  .section-matrix tbody,
  .section-matrix tr,
  .section-matrix th,
  .section-matrix td {
    display: block;
    width: 100%;
  }

  .section-matrix tr + tr {
    border-top: 1px solid var(--line);
  }

  .section-matrix th,
  .section-matrix td {
    border-bottom: 0;
  }

  .section-matrix th {
    padding-bottom: 5px;
    background: var(--component-wash);
  }

  .section-matrix td {
    padding-top: 7px;
  }
}

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

  .product-card {
    transition: none;
  }
}