:root {
  --ink: #202326;
  --muted: #5c646b;
  --paper: #fbfaf7;
  --panel: #ffffff;
  --line: #d8d4ca;
  --navy: #17324d;
  --blue: #235c7f;
  --red: #8f2f2f;
  --gold: #755b17;
  --shadow: 0 18px 40px rgba(23, 50, 77, 0.10);
  --font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;
  --measure: 68ch;
  --step--1: 0.9rem;
  --step-0: 1rem;
  --step-1: 1.14rem;
  --step-2: 1.38rem;
  --step-3: 1.82rem;
  --step-4: 2.55rem;
  --step-5: 3.45rem;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--blue);
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--red);
}

a:focus-visible,
button:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid #b7791f;
  outline-offset: 3px;
}

.skip-link {
  background: var(--navy);
  border-radius: 6px;
  color: #fff;
  font-weight: 800;
  left: 1rem;
  padding: 0.65rem 0.85rem;
  position: fixed;
  text-decoration: none;
  top: 1rem;
  transform: translateY(-150%);
  z-index: 100;
}

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

.main-anchor:focus {
  outline: none;
}

.site-alert {
  background: var(--red);
  color: #fff;
  font-size: var(--step--1);
  font-weight: 700;
  letter-spacing: 0;
  padding: 0.65rem 1rem;
  text-align: center;
}

.site-header {
  align-items: center;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  display: flex;
  gap: 1.25rem;
  justify-content: space-between;
  padding: 1rem clamp(1rem, 4vw, 3rem);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  color: var(--navy);
  font-family: var(--font-serif);
  font-size: var(--step-1);
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

nav ul {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.75rem;
  justify-content: flex-end;
  list-style: none;
  margin: 0;
  padding: 0;
}

nav a {
  border-radius: 6px;
  color: var(--ink);
  display: inline-block;
  font-size: var(--step--1);
  font-weight: 700;
  padding: 0.35rem 0.45rem;
  text-decoration: none;
}

nav a:hover,
nav a[aria-current="page"] {
  background: #eef4f7;
  color: var(--blue);
}

main {
  margin: 0 auto;
  max-width: 1120px;
  padding: clamp(1rem, 4vw, 3rem);
}

.home-main {
  max-width: 1180px;
}

.hero {
  align-items: end;
  background:
    linear-gradient(110deg, rgba(20, 28, 35, 0.96), rgba(35, 92, 127, 0.72)),
    url("assets/archive-reading-room.webp");
  background-size: cover;
  background-position: center;
  border-radius: 8px;
  box-shadow: var(--shadow);
  color: #fff;
  min-height: min(70vh, 620px);
  padding: clamp(2rem, 7vw, 5rem);
}

.hero-copy {
  max-width: 820px;
}

.eyebrow {
  color: var(--gold);
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  margin: 0 0 0.6rem;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: #f0cf78;
}

h1,
h2,
h3,
h4 {
  color: var(--navy);
  font-family: var(--font-serif);
  letter-spacing: 0;
  line-height: 1.12;
}

h1 {
  font-size: var(--step-4);
}

h2 {
  font-size: var(--step-3);
}

h3 {
  font-size: var(--step-2);
}

h4 {
  font-size: var(--step-1);
}

.hero h1 {
  color: #fff;
  font-size: var(--step-5);
  margin: 0;
  max-width: 860px;
}

.lead {
  color: #3b4248;
  font-size: var(--step-1);
  line-height: 1.58;
  margin: 0.9rem 0 0;
  max-width: 780px;
}

.hero .lead {
  color: rgba(255, 255, 255, 0.9);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.6rem;
}

.button {
  background: #fff;
  border: 1px solid #fff;
  border-radius: 6px;
  color: var(--navy);
  display: inline-flex;
  font-weight: 800;
  justify-content: center;
  min-height: 44px;
  padding: 0.65rem 1rem;
  text-decoration: none;
}

.button.secondary {
  background: transparent;
  color: #fff;
}

.button:hover {
  background: #f4efe4;
  color: var(--red);
}

section {
  margin-top: clamp(1.5rem, 4vw, 3rem);
}

.page {
  max-width: 920px;
}

.page-header {
  border-bottom: 1px solid var(--line);
  padding-bottom: 1.5rem;
}

.page-header h1 {
  font-size: var(--step-4);
  margin: 0;
}

.notice-panel,
.standards,
.sources,
.content-warning,
.article-support,
.article-orientation,
.answer-first,
.source-packet {
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 5px solid var(--red);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: clamp(1rem, 3vw, 1.5rem);
}

.content-warning {
  display: flex;
  gap: 0.5rem;
}

.link-grid,
.collection-grid,
.course-paths {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.link-grid h2 {
  grid-column: 1 / -1;
  margin-bottom: 0;
}

.link-grid article,
.collection-grid article,
.glossary-list article,
.course-paths article {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1rem;
}

.link-grid h3,
.link-grid h4,
.collection-grid h3,
.glossary-list h3,
.course-paths h3 {
  font-size: 1.25rem;
  margin: 0 0 0.5rem;
}

.link-grid p,
.collection-grid p,
.glossary-list p,
.course-paths p {
  color: var(--muted);
  margin: 0;
}

.route-sections > h2 {
  margin-bottom: 0.75rem;
}

.route-band {
  border-top: 1px solid var(--line);
  margin-top: 1.25rem;
  padding-top: 1.25rem;
}

.route-band h3 {
  margin: 0 0 0.9rem;
}

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

.topic-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.topic-list a {
  background: #eef4f7;
  border: 1px solid #c7dbe7;
  border-radius: 999px;
  color: var(--navy);
  font-weight: 800;
  padding: 0.45rem 0.75rem;
  text-decoration: none;
}

.topic-list a:hover {
  background: #f6e9e4;
  border-color: #e0c5bc;
  color: var(--red);
}

.article-index,
.article-body {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: clamp(1rem, 3vw, 1.5rem);
}

.article-body {
  font-size: var(--step-1);
  line-height: 1.72;
}

.article-body > p,
.article-body > ul,
.article-body > ol,
.article-support > p,
.article-support > ul,
.article-support > ol {
  max-width: var(--measure);
}

.article-body blockquote {
  background: #f7f5ef;
  border-left: 5px solid var(--gold);
  color: #34383c;
  margin: 1.5rem 0;
  max-width: var(--measure);
  padding: 1rem 1.2rem;
}

.article-body blockquote p {
  margin: 0;
}

.article-body blockquote p + p {
  margin-top: 0.75rem;
}

.article-body figure {
  margin: 1.5rem 0;
  max-width: var(--measure);
}

.article-body figcaption {
  color: var(--muted);
  font-size: var(--step--1);
  margin-top: 0.5rem;
}

.article-body table,
.page table {
  border-collapse: collapse;
  font-size: var(--step--1);
  margin: 1.25rem 0;
  max-width: 100%;
  width: 100%;
}

.article-body th,
.article-body td,
.page th,
.page td {
  border: 1px solid var(--line);
  padding: 0.65rem;
  text-align: left;
  vertical-align: top;
}

.article-body th,
.page th {
  background: #f1efe8;
  color: var(--navy);
}

.breadcrumbs {
  color: var(--muted);
  font-size: 0.92rem;
  margin-bottom: 1rem;
}

.breadcrumbs ol {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.breadcrumbs li:not(:last-child)::after {
  color: var(--line);
  content: "/";
  margin-left: 0.35rem;
}

.review-status {
  color: var(--muted);
  margin: 0.8rem 0 0;
}

.article-orientation {
  border-left-color: var(--gold);
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(0, 1.25fr) minmax(240px, 0.75fr);
}

.article-orientation h2 {
  margin-top: 0;
}

.article-toc ol {
  margin-bottom: 0;
}

.article-toc {
  align-self: start;
  position: sticky;
  top: 6rem;
}

.source-quality-note {
  border-left-color: var(--blue);
}

.answer-first {
  border-left-color: var(--navy);
}

.answer-first h2,
.source-packet h2,
.source-packet h3,
.source-packet h4 {
  margin-top: 0;
}

.source-packet {
  border-left-color: var(--blue);
}

.source-packet-hub {
  margin-top: 2rem;
}

.packet-header {
  border-bottom: 1px solid var(--line);
  padding-bottom: 1rem;
}

.packet-summary {
  color: var(--ink);
  font-size: var(--step-1);
  margin: 0.5rem 0 1rem;
}

.packet-meta {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
}

.packet-meta div {
  background: #f7f5ef;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.75rem;
}

.packet-meta dt {
  color: var(--navy);
  font-weight: 800;
}

.packet-meta dd {
  color: var(--muted);
  margin: 0.25rem 0 0;
}

.packet-section {
  border-top: 1px solid var(--line);
  margin-top: 1.25rem;
  padding-top: 1.25rem;
}

.packet-deep-dive article,
.claim-map article,
.source-coverage article,
.packet-grid > section,
.related-topic-path {
  background: #fdfcf8;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1rem;
}

.packet-details summary {
  color: var(--navy);
  cursor: pointer;
  font-family: var(--font-serif);
  font-size: var(--step-2);
  font-weight: 700;
  line-height: 1.12;
}

.packet-detail-body {
  margin-top: 1rem;
}

.packet-deep-dive article + article,
.claim-map article + article,
.source-coverage article + article {
  margin-top: 0.85rem;
}

.packet-deep-dive h4,
.claim-map h4,
.source-coverage h4 {
  font-size: 1.14rem;
  margin-bottom: 0.45rem;
}

.claim-sources,
.packet-review-note {
  color: var(--muted);
  font-size: 0.94rem;
}

.packet-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  margin-top: 1.25rem;
}

.packet-grid h4 {
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 0.98rem;
  margin-bottom: 0.25rem;
}

.related-topic-path ol {
  margin-bottom: 0;
}

.article-body h2 {
  border-top: 1px solid var(--line);
  margin-top: 2rem;
  padding-top: 1.5rem;
}

.article-body h2:first-child {
  border-top: 0;
  margin-top: 0;
  padding-top: 0;
}

.article-meta {
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1rem;
  margin-top: 1rem;
}

.article-meta span {
  border-right: 1px solid var(--line);
  padding-right: 1rem;
}

.article-meta span:last-child {
  border-right: 0;
  padding-right: 0;
}

ul,
ol {
  padding-left: 1.3rem;
}

li + li {
  margin-top: 0.45rem;
}

.index-list {
  columns: 2;
}

.source-list,
.related-list {
  list-style: none;
  padding-left: 0;
}

.source-list li,
.related-list li {
  border-top: 1px solid var(--line);
  padding-top: 0.55rem;
}

.source-list span {
  color: var(--muted);
  display: block;
  font-size: 0.93rem;
  margin-top: 0.15rem;
}

.definition-list {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1rem;
}

.definition-list dt {
  color: var(--navy);
  font-weight: 800;
  margin-top: 1rem;
}

.definition-list dt:first-child {
  margin-top: 0;
}

.definition-list dd {
  color: var(--muted);
  margin: 0.2rem 0 0;
}

.search-page {
  max-width: 900px;
}

.search-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: clamp(1rem, 3vw, 1.5rem);
}

.search-widget {
  --pagefind-ui-primary: var(--navy);
  --pagefind-ui-text: var(--ink);
  --pagefind-ui-background: var(--panel);
  --pagefind-ui-border: var(--line);
  --pagefind-ui-tag: #eef4f7;
  --pagefind-ui-border-radius: 6px;
  --pagefind-ui-font: var(--font-sans);
}

.search-widget .pagefind-ui__form {
  margin: 0;
}

.search-widget .pagefind-ui__search-input {
  background: #fdfcf8;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  font: inherit;
  min-height: 52px;
  padding: 0.8rem 1rem;
}

.search-widget .pagefind-ui__search-input:focus {
  border-color: var(--blue);
  outline: 3px solid rgba(183, 121, 31, 0.28);
  outline-offset: 2px;
}

.search-widget .pagefind-ui__result {
  border-top: 1px solid var(--line);
  padding: 1rem 0;
}

.search-widget .pagefind-ui__result-title {
  font-family: var(--font-serif);
  font-size: var(--step-1);
  line-height: 1.18;
}

.search-widget .pagefind-ui__result-link {
  color: var(--navy);
  font-weight: 800;
  text-decoration-thickness: 1px;
}

.search-widget .pagefind-ui__result-excerpt,
.search-widget .pagefind-ui__message,
.search-widget .pagefind-ui__result-nested {
  color: var(--muted);
}

.search-widget .pagefind-ui__button,
.search-widget .pagefind-ui__search-clear {
  border-radius: 6px;
  font-weight: 800;
}

.search-noscript {
  margin-top: 1rem;
}

.fallback-list {
  columns: 2;
}

.annotated-samples {
  display: grid;
  gap: 1rem;
}

.annotated-samples > article,
.update-log > article {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1rem;
}

.update-log {
  display: grid;
  gap: 1rem;
}

.annotated-samples h3 {
  margin-top: 0;
}

.future-path {
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-size: 0.85rem;
  margin-top: 0.6rem !important;
}

details {
  border-top: 1px solid var(--line);
  padding: 0.75rem 0;
}

summary {
  color: var(--navy);
  cursor: pointer;
  font-weight: 800;
}

.site-footer {
  background: var(--navy);
  color: rgba(255, 255, 255, 0.86);
  margin-top: 2rem;
  padding: 1.5rem clamp(1rem, 4vw, 3rem);
  text-align: center;
}

.site-footer p {
  margin: 0.2rem 0;
}

.site-footer a {
  color: #fff;
  font-weight: 800;
}

@media (max-width: 820px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    position: static;
  }

  nav ul {
    justify-content: flex-start;
  }

  .hero {
    min-height: auto;
  }

  .link-grid,
  .collection-grid,
  .course-paths,
  .compact-grid,
  .article-orientation,
  .packet-meta,
  .packet-grid {
    grid-template-columns: 1fr;
  }

  .article-toc {
    position: static;
  }

  .index-list {
    columns: 1;
  }

  .fallback-list {
    columns: 1;
  }
}

@media (max-width: 520px) {
  :root {
    --step-3: 1.62rem;
    --step-4: 2.12rem;
    --step-5: 2.5rem;
  }

  main {
    padding: 1rem;
  }

  .site-alert {
    text-align: left;
  }

  .brand {
    white-space: normal;
  }

  .hero-actions,
  .button {
    width: 100%;
  }

  .content-warning {
    display: block;
  }

  .search-panel {
    padding: 1rem;
  }
}

@media print {
  @page {
    margin: 0.7in;
  }

  :root {
    --ink: #000000;
    --muted: #333333;
    --paper: #ffffff;
    --panel: #ffffff;
    --line: #999999;
    --navy: #000000;
    --blue: #000000;
    --red: #000000;
    --gold: #000000;
    --shadow: none;
  }

  html {
    scroll-behavior: auto;
  }

  body {
    background: #ffffff;
    color: #000000;
    font-family: var(--font-serif);
    font-size: 11pt;
    line-height: 1.48;
  }

  .skip-link,
  .site-alert,
  .site-header,
  .site-footer,
  .breadcrumbs,
  .hero-actions {
    display: none !important;
  }

  main,
  .home-main,
  .page {
    margin: 0;
    max-width: none;
    padding: 0;
  }

  .hero {
    background: none !important;
    border: 0;
    box-shadow: none;
    color: #000000;
    min-height: 0;
    padding: 0;
  }

  .hero h1,
  .hero .lead,
  .hero .eyebrow {
    color: #000000;
  }

  a {
    color: #000000;
    text-decoration: underline;
  }

  h1,
  h2,
  h3,
  h4 {
    break-after: avoid;
    color: #000000;
  }

  .notice-panel,
  .standards,
  .sources,
  .content-warning,
  .article-support,
  .article-orientation,
  .answer-first,
  .source-packet,
  .article-index,
  .article-body,
  .link-grid article,
  .collection-grid article,
  .glossary-list article,
  .course-paths article,
  .packet-deep-dive article,
  .claim-map article,
  .source-coverage article,
  .packet-grid > section,
  .related-topic-path,
  .definition-list,
  .annotated-samples > article,
  .update-log > article {
    background: #ffffff;
    break-inside: avoid;
    box-shadow: none;
  }

  .article-body {
    border: 0;
    padding: 0;
  }

  .article-orientation,
  .packet-grid,
  .packet-meta,
  .link-grid,
  .collection-grid,
  .course-paths,
  .compact-grid {
    display: block;
  }

  .article-toc {
    position: static;
  }

  details,
  .packet-section,
  .source-list li,
  .related-list li {
    break-inside: avoid;
  }

  .source-list a[href^="http"]::after,
  .source-coverage a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 9pt;
    overflow-wrap: anywhere;
  }

  .search-panel,
  .search-noscript {
    box-shadow: none;
  }
}