:root {
  --navy: #0b151b;
  --navy-2: #13232c;
  --navy-rule: #29404a;
  --paper: #f4f0e7;
  --paper-2: #e9e2d4;
  --ink: #172022;
  --muted: #667174;
  --rule: #cbc4b7;
  --cyan: #72c8d2;
  --cyan-dark: #286b74;
  --cream: #f2f6f4;
  --serif: Charter, "Bitstream Charter", "Sitka Text", Cambria, Georgia, serif;
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
}

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

a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 5px;
}

.split-hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(360px, 34%) 1fr;
}

.hero-chrome {
  min-height: 760px;
  padding: 32px 42px 38px;
  display: flex;
  flex-direction: column;
  background: var(--navy);
  color: var(--cream);
}

.masthead,
.sub-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.masthead {
  padding-bottom: 22px;
  border-bottom: 1px solid var(--navy-rule);
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 13px;
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.wordmark b {
  color: var(--cyan);
  font-weight: 500;
}

.mark {
  width: 36px;
  height: 36px;
  border: 1px solid var(--cyan);
  border-radius: 50%;
  display: inline-grid;
  place-items: center;
  color: var(--cyan);
  font-family: var(--serif);
  font-size: 20px;
  font-style: italic;
}

.mark.small {
  width: 28px;
  height: 28px;
  font-size: 15px;
}

.masthead nav,
.sub-header nav,
.site-footer nav {
  display: flex;
  gap: 22px;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.masthead nav a,
.sub-header nav a,
.site-footer nav a {
  color: #aabbbd;
  transition: color 160ms ease;
}

.masthead nav a:hover,
.sub-header nav a:hover,
.site-footer nav a:hover,
.masthead nav a[aria-current="page"],
.sub-header nav a[aria-current="page"] {
  color: var(--cyan);
}

.hero-copy {
  max-width: 540px;
  margin: auto 0;
  padding: 72px 0;
}

.eyebrow {
  margin: 0 0 20px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.13em;
  line-height: 1.4;
  text-transform: uppercase;
}

.cyan {
  color: var(--cyan);
}

.ink-accent {
  color: var(--cyan-dark);
}

.hero-copy h1 {
  margin: 0 0 32px;
  font: 500 clamp(3.5rem, 6vw, 6.8rem) / 0.9 var(--serif);
  letter-spacing: -0.055em;
}

.hero-dek {
  max-width: 460px;
  color: #aabbbd;
  font: 400 18px/1.6 var(--serif);
}

.primary-action {
  min-width: 270px;
  margin-top: 20px;
  padding: 16px 18px;
  border: 1px solid var(--cyan);
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  color: var(--cream);
  font-size: 13px;
  transition: background 180ms ease;
}

.primary-action span {
  font-size: 19px;
  transition: transform 180ms ease;
}

.primary-action:hover {
  background: var(--cyan-dark);
}

.primary-action:hover span {
  transform: translateX(4px);
}

.hero-footer {
  padding-top: 22px;
  border-top: 1px solid var(--navy-rule);
  display: flex;
  justify-content: space-between;
  gap: 24px;
  color: #aabbbd;
  font-size: 11px;
  letter-spacing: 0.05em;
}

.hero-footer p {
  margin: 0;
}

.hero-paper {
  padding: clamp(48px, 6vw, 96px) clamp(40px, 8vw, 140px);
  background: var(--paper);
}

.hero-paper > h2 {
  max-width: 900px;
  margin: 0 0 26px;
  font: 500 clamp(3rem, 5.2vw, 6rem) / 0.98 var(--serif);
  letter-spacing: -0.045em;
}

.paper-dek {
  max-width: 780px;
  color: #465052;
  font: 400 21px/1.55 var(--serif);
}

.byline {
  max-width: 780px;
  margin: 32px 0 44px;
  padding: 19px 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.byline time {
  margin-left: auto;
}

.evidence-callout {
  max-width: 780px;
  margin-bottom: 52px;
  padding: 24px 28px;
  border-left: 4px solid var(--cyan-dark);
  background: var(--paper-2);
}

.evidence-callout .eyebrow {
  margin-bottom: 8px;
}

.evidence-callout strong {
  font: 500 21px/1.35 var(--serif);
}

.evidence-callout p:last-child {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.6;
}

.reading-preview {
  max-width: 780px;
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 38px;
}

.reading-preview aside {
  border-right: 1px solid var(--rule);
  color: var(--muted);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.reading-preview aside span {
  color: var(--cyan-dark);
}

.reading-preview aside p {
  margin: 3px 20px 18px 0;
}

.reading-preview h3 {
  margin: 0 0 16px;
  font: 500 34px/1.1 var(--serif);
}

.reading-preview div p {
  font: 18px/1.72 var(--serif);
}

.text-link {
  color: var(--cyan-dark);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.latest-section {
  padding: 100px clamp(28px, 5vw, 80px) 120px;
}

.section-heading {
  padding-bottom: 24px;
  border-bottom: 1px solid var(--ink);
  display: flex;
  align-items: end;
  justify-content: space-between;
}

.section-heading h2,
.standards-section h2 {
  margin: 0;
  font: 500 clamp(2.5rem, 4vw, 5rem) / 1 var(--serif);
  letter-spacing: -0.04em;
}

.brief-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1fr;
}

.brief-card {
  min-height: 410px;
  padding: 30px;
  border-right: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
}

.brief-card:first-child {
  padding-left: 0;
}

.brief-card:last-child {
  padding-right: 0;
  border-right: 0;
}

.card-meta {
  margin-bottom: 65px;
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.brief-card h3 {
  margin: 0 0 18px;
  font: 500 clamp(1.7rem, 2.4vw, 2.8rem) / 1.05 var(--serif);
  letter-spacing: -0.03em;
}

.brief-card > p:not(.eyebrow) {
  max-width: 46ch;
  color: var(--muted);
  line-height: 1.6;
}

.card-bottom {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
}

.card-bottom a {
  color: var(--cyan-dark);
  font-size: 20px;
}

.standards-section {
  padding: 100px clamp(28px, 5vw, 80px);
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 100px;
  background: var(--navy);
  color: var(--cream);
}

.standards-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.standards-grid p {
  min-height: 150px;
  margin: 0;
  padding: 24px;
  border-left: 1px solid var(--navy-rule);
  border-bottom: 1px solid var(--navy-rule);
}

.standards-grid b,
.standards-grid span {
  display: block;
}

.standards-grid b {
  margin-bottom: 18px;
  color: var(--cyan);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.standards-grid span {
  color: #aabbbd;
  font: 17px/1.5 var(--serif);
}

.site-footer {
  min-height: 160px;
  padding: 40px clamp(28px, 5vw, 80px);
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  align-items: center;
  gap: 40px;
  background: #071015;
  color: #aabbbd;
  font-size: 11px;
}

.site-footer > div {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--cream);
}

.site-footer nav {
  justify-content: end;
}

.subpage {
  min-height: 100vh;
  background: var(--paper);
}

.sub-header {
  padding: 24px clamp(24px, 5vw, 80px);
  background: var(--navy);
  color: var(--cream);
}

.page-intro {
  padding: 100px clamp(24px, 8vw, 140px) 70px;
  border-bottom: 1px solid var(--rule);
}

.page-intro h1 {
  max-width: 1000px;
  margin: 0 0 28px;
  font: 500 clamp(3.5rem, 7vw, 8rem) / 0.9 var(--serif);
  letter-spacing: -0.055em;
}

.page-intro > p:last-child {
  max-width: 680px;
  color: var(--muted);
  font: 20px/1.6 var(--serif);
}

.archive-list {
  padding: 0 clamp(24px, 8vw, 140px) 120px;
}

.archive-row {
  padding: 42px 0;
  border-bottom: 1px solid var(--rule);
  display: grid;
  grid-template-columns: 120px 1fr 170px;
  gap: 32px;
}

.archive-row h2 {
  margin: 0 0 12px;
  font: 500 clamp(1.8rem, 3vw, 3.5rem) / 1.04 var(--serif);
}

.archive-row p {
  max-width: 680px;
  color: var(--muted);
  line-height: 1.6;
}

.archive-row > span,
.archive-row time {
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.article-shell {
  padding: 80px clamp(24px, 6vw, 100px) 120px;
  display: grid;
  grid-template-columns: 260px minmax(0, 760px) 1fr;
  gap: 70px;
}

.article-toc {
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.article-toc a {
  display: block;
  padding: 10px 0;
  border-bottom: 1px solid var(--rule);
}

.article-toc a:hover {
  color: var(--cyan-dark);
}

.article-body h1 {
  margin: 8px 0 24px;
  font: 500 clamp(3rem, 5vw, 5.5rem) / 0.98 var(--serif);
  letter-spacing: -0.045em;
}

.article-body h2 {
  margin: 64px 0 18px;
  font: 500 2.2rem/1.1 var(--serif);
}

.article-body p,
.article-body li {
  font: 18px/1.75 var(--serif);
}

.article-body .lede {
  color: #3d494b;
  font-size: 22px;
}

.article-body .disclaimer {
  padding: 18px 22px;
  border-left: 4px solid var(--cyan-dark);
  background: var(--paper-2);
  font: 14px/1.55 var(--sans);
}

.article-body sup {
  color: var(--cyan-dark);
  font-family: var(--sans);
  font-weight: 700;
}

.article-note {
  padding-top: 130px;
}

.article-note div {
  padding-top: 16px;
  border-top: 3px solid var(--ink);
}

.article-note strong {
  font: 500 20px/1.3 var(--serif);
}

.reference-list li {
  margin-bottom: 16px;
  font-size: 15px;
}

@media (max-width: 1000px) {
  .split-hero {
    grid-template-columns: 1fr;
  }

  .hero-chrome {
    min-height: 690px;
  }

  .brief-grid {
    grid-template-columns: 1fr;
  }

  .brief-card,
  .brief-card:first-child,
  .brief-card:last-child {
    min-height: 330px;
    padding: 34px 0;
    border-right: 0;
    border-bottom: 1px solid var(--rule);
  }

  .card-meta {
    margin-bottom: 38px;
  }

  .standards-section {
    grid-template-columns: 1fr;
    gap: 60px;
  }

  .article-shell {
    grid-template-columns: 180px 1fr;
  }

  .article-note {
    display: none;
  }
}

@media (max-width: 700px) {
  .hero-chrome {
    padding: 24px;
  }

  .hero-paper {
    padding: 60px 24px;
  }

  .masthead nav {
    gap: 12px;
  }

  .hero-footer,
  .site-footer {
    display: flex;
    flex-direction: column;
  }

  .reading-preview {
    grid-template-columns: 1fr;
  }

  .reading-preview aside {
    display: none;
  }

  .section-heading {
    flex-direction: column;
    align-items: start;
    gap: 28px;
  }

  .standards-grid {
    grid-template-columns: 1fr;
  }

  .standards-grid p {
    padding-left: 0;
    border-left: 0;
  }

  .archive-row {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .archive-row > time {
    order: 2;
  }

  .article-shell {
    grid-template-columns: 1fr;
    padding-top: 40px;
  }

  .article-toc {
    display: none;
  }

  .sub-header {
    align-items: flex-start;
    gap: 20px;
  }

  .sub-header nav {
    flex-direction: column;
    gap: 8px;
  }
}

/* === Evidence Confidence Badges === */
.evidence-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.02em;
}
.evidence-badge.high       { background: #d4edda; color: #155724; }
.evidence-badge.moderate   { background: #cce5ff; color: #004085; }
.evidence-badge.emerging   { background: #fff3cd; color: #856404; }
.evidence-badge.experimental { background: #f8d7da; color: #721c24; }

.editorial-policy {
  margin-top: 3rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--rule);
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.5;
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}