:root {
  color-scheme: light;
  --paper: #f7f8fa;
  --paper-raised: #ffffff;
  --ink: #122033;
  --ink-soft: #435064;
  --ink-faint: #647084;
  --line: #cbd2dc;
  --line-strong: #8d99aa;
  --navy: #17365e;
  --signal: #08756f;
  --signal-dark: #075b57;
  --signal-pale: #dcefed;
  --focus: #f1a208;
  --serif: Charter, "Bitstream Charter", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --content: 74rem;
  --reading: 46rem;
  --shadow: 0 1rem 3rem rgb(18 32 51 / 8%);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    linear-gradient(90deg, transparent 0, transparent calc(50% - 37rem), rgb(23 54 94 / 4%) calc(50% - 37rem), rgb(23 54 94 / 4%) calc(50% - 36.94rem), transparent calc(50% - 36.94rem)),
    var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.68;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--signal-dark);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

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

:focus-visible {
  outline: 0.2rem solid var(--focus);
  outline-offset: 0.22rem;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.65rem 0.9rem;
  border: 1px solid var(--ink);
  background: var(--paper-raised);
  color: var(--ink);
  transform: translateY(-200%);
}

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

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgb(247 248 250 / 94%);
}

.header-inner,
.site-footer,
.page-shell {
  width: min(calc(100% - 2rem), var(--content));
  margin-inline: auto;
}

.header-inner {
  display: flex;
  min-height: 5.25rem;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.identity {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  color: var(--ink);
  font-weight: 720;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.identity-mark {
  display: grid;
  width: 2.5rem;
  height: 2.5rem;
  place-items: center;
  border: 1px solid var(--navy);
  color: var(--navy);
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: -0.06em;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a {
  color: var(--ink-soft);
  font-size: 0.9rem;
  font-weight: 650;
  text-decoration: none;
}

.site-nav a[aria-current="page"],
.site-nav a:hover {
  color: var(--signal-dark);
  text-decoration: underline;
  text-decoration-thickness: 0.12rem;
  text-underline-offset: 0.35rem;
}

.page-shell {
  padding-block: clamp(3.5rem, 8vw, 7.5rem) 5rem;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(17rem, 0.65fr);
  gap: clamp(3rem, 7vw, 7rem);
  align-items: end;
  padding-bottom: clamp(4rem, 8vw, 7rem);
  border-bottom: 1px solid var(--line-strong);
}

.eyebrow,
.section-label,
.note-number,
.metadata dt,
.record-label,
.breadcrumb,
.footer-label {
  font-family: var(--mono);
  font-size: 0.76rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  line-height: 1.4;
  text-transform: uppercase;
}

.eyebrow,
.section-label,
.note-number,
.record-label {
  color: var(--signal-dark);
}

h1,
h2,
h3 {
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: -0.032em;
  text-wrap: balance;
}

h1 {
  max-width: 12ch;
  margin: 1rem 0 1.35rem;
  font-size: clamp(3rem, 7.5vw, 6.6rem);
  line-height: 0.98;
}

h2 {
  margin: 0 0 1.25rem;
  font-size: clamp(2rem, 4vw, 3.3rem);
  line-height: 1.08;
}

h3 {
  margin: 0 0 0.7rem;
  font-size: clamp(1.3rem, 2.2vw, 1.65rem);
  line-height: 1.24;
}

p,
ul,
ol,
blockquote,
table {
  margin-top: 0;
}

caption {
  padding: 0.8rem 0;
  color: var(--ink-faint);
  font-size: 0.78rem;
  font-weight: 620;
  text-align: left;
}

.hero-deck {
  max-width: 42rem;
  margin-bottom: 0;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: clamp(1.25rem, 2.2vw, 1.65rem);
  line-height: 1.46;
}

.descriptor {
  display: inline-block;
  margin-top: 1.5rem;
  padding: 0.35rem 0.62rem;
  background: var(--signal-pale);
  color: var(--signal-dark);
  font-size: 0.83rem;
  font-weight: 670;
}

.register {
  margin: 0;
  border-top: 0.25rem solid var(--navy);
}

.register-row {
  display: grid;
  grid-template-columns: 5rem 1fr;
  gap: 1rem;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--line);
}

.register dt,
.register dd {
  margin: 0;
}

.register dt {
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 0.75rem;
  text-transform: uppercase;
}

.register dd {
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 650;
}

.section-grid {
  display: grid;
  grid-template-columns: minmax(10rem, 0.42fr) minmax(0, 1.58fr);
  gap: clamp(2rem, 7vw, 7rem);
  padding-block: clamp(4rem, 8vw, 7rem);
  border-bottom: 1px solid var(--line);
}

.section-copy {
  max-width: var(--reading);
}

.section-copy > p {
  color: var(--ink-soft);
  font-size: 1.08rem;
}

.note-card {
  position: relative;
  display: grid;
  grid-template-columns: 7rem minmax(0, 1fr) auto;
  gap: clamp(1.25rem, 4vw, 3rem);
  align-items: start;
  margin-top: 2rem;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border: 1px solid var(--line-strong);
  background: var(--paper-raised);
  box-shadow: var(--shadow);
  color: inherit;
  text-decoration: none;
}

.note-card::before {
  position: absolute;
  top: -1px;
  bottom: -1px;
  left: -1px;
  width: 0.35rem;
  background: var(--signal);
  content: "";
}

.note-card:hover {
  border-color: var(--navy);
  color: inherit;
}

.note-card h3 {
  max-width: 27ch;
}

.note-card p {
  margin-bottom: 0;
  color: var(--ink-soft);
}

.note-arrow {
  color: var(--signal-dark);
  font-size: 1.5rem;
  line-height: 1;
}

.topic-list,
.layer-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: 2rem 0 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
  list-style: none;
}

.topic-list li,
.layer-list li {
  min-height: 4rem;
  padding: 1rem 1.25rem 1rem 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
}

.topic-list li:nth-child(odd),
.layer-list li:nth-child(odd) {
  padding-right: 2rem;
}

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

.layer-list li {
  padding-right: 2rem;
}

.layer-list strong {
  display: block;
  margin-bottom: 0.3rem;
  color: var(--ink);
}

.page-intro {
  max-width: 53rem;
  padding-bottom: clamp(3rem, 7vw, 6rem);
  border-bottom: 1px solid var(--line-strong);
}

.page-intro h1,
.article-header h1,
.error-page h1 {
  max-width: 14ch;
  font-size: clamp(2.8rem, 6vw, 5.2rem);
}

.page-intro p {
  max-width: 42rem;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: 1.3rem;
}

.research-list {
  margin-top: 3rem;
}

.breadcrumb {
  margin-bottom: 2rem;
  color: var(--ink-faint);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumb li:not(:last-child)::after {
  margin-left: 0.5rem;
  color: var(--line-strong);
  content: "/";
}

.article-header {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(17rem, 0.55fr);
  gap: clamp(2.5rem, 7vw, 7rem);
  align-items: end;
  padding-bottom: clamp(3rem, 7vw, 6rem);
  border-bottom: 1px solid var(--line-strong);
}

.article-header h1 {
  max-width: 18ch;
}

.article-abstract {
  max-width: 47rem;
  margin-bottom: 0;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: 1.25rem;
}

.metadata {
  margin: 0;
  border-top: 0.25rem solid var(--navy);
}

.metadata div {
  display: grid;
  grid-template-columns: 6rem 1fr;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--line);
}

.metadata dt,
.metadata dd {
  margin: 0;
}

.metadata dt {
  color: var(--ink-faint);
}

.metadata dd {
  font-size: 0.92rem;
  font-weight: 620;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(13rem, 0.45fr) minmax(0, 1.55fr);
  gap: clamp(2.5rem, 7vw, 7rem);
  padding-top: clamp(3rem, 7vw, 6rem);
}

.article-toc {
  position: sticky;
  top: 2rem;
  align-self: start;
  padding-top: 0.75rem;
  border-top: 0.25rem solid var(--signal);
}

.article-toc h2 {
  margin-bottom: 0.75rem;
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.article-toc ol {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--ink-faint);
}

.article-toc a {
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.article-body {
  max-width: var(--reading);
  min-width: 0;
}

.article-body section {
  padding-bottom: 3.5rem;
  scroll-margin-top: 2rem;
}

.article-body p,
.article-body li {
  color: var(--ink-soft);
}

.article-body p,
.article-body ul,
.article-body ol {
  max-width: 42rem;
}

.article-body strong {
  color: var(--ink);
}

.record-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 2rem 0;
  border: 1px solid var(--line);
  background: var(--line);
}

.record {
  min-height: 8rem;
  padding: 1.25rem;
  background: var(--paper-raised);
}

.record-value {
  display: block;
  margin-top: 0.45rem;
  color: var(--navy);
  font-family: var(--serif);
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  font-weight: 600;
  line-height: 1;
}

.record-detail {
  display: block;
  margin-top: 0.55rem;
  color: var(--ink-faint);
  font-size: 0.78rem;
}

.table-wrap {
  width: 100%;
  min-width: 0;
  max-width: 100%;
  margin: 1.75rem 0;
  overflow-x: auto;
  border-top: 1px solid var(--line-strong);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  line-height: 1.45;
}

th,
td {
  padding: 0.8rem 0.75rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

td {
  color: var(--ink-soft);
}

td.numeric,
th.numeric {
  text-align: right;
  white-space: nowrap;
}

.method-note,
.finding {
  margin: 2rem 0;
  padding: 1.4rem 1.5rem;
  border-left: 0.3rem solid var(--signal);
  background: var(--signal-pale);
}

.method-note p:last-child,
.finding p:last-child {
  margin-bottom: 0;
}

.prompt {
  margin: 1.5rem 0;
  padding: 1.25rem;
  border: 1px solid var(--line);
  background: var(--paper-raised);
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.65;
  white-space: pre-wrap;
}

code {
  overflow-wrap: anywhere;
  color: var(--navy);
  font-family: var(--mono);
  font-size: 0.86em;
}

.architecture-result {
  display: grid;
  gap: 1rem;
  margin-top: 2rem;
}

.architecture-row {
  display: grid;
  grid-template-columns: 13rem 1fr;
  gap: 1.5rem;
  padding: 1.1rem 0;
  border-top: 1px solid var(--line);
}

.architecture-row strong {
  color: var(--navy);
  font-family: var(--serif);
  font-size: 1.25rem;
}

.site-footer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  padding-block: 2rem 3rem;
  border-top: 1px solid var(--line-strong);
  color: var(--ink-faint);
  font-size: 0.84rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1.2rem;
}

.footer-links a {
  color: var(--ink-soft);
}

.error-page {
  min-height: calc(100vh - 14rem);
  display: grid;
  align-content: center;
  max-width: 52rem;
}

.error-code {
  color: var(--signal-dark);
  font-family: var(--mono);
}

@media (max-width: 52rem) {
  .hero,
  .article-header,
  .article-layout,
  .section-grid {
    grid-template-columns: 1fr;
  }

  .hero,
  .article-header {
    align-items: start;
  }

  .hero {
    gap: 3rem;
  }

  .section-grid {
    gap: 1.5rem;
  }

  .article-toc {
    position: static;
  }

  .article-toc ol {
    columns: 2;
  }

  .note-card {
    grid-template-columns: 5rem minmax(0, 1fr);
  }

  .note-arrow {
    display: none;
  }

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

@media (max-width: 38rem) {
  .header-inner {
    min-height: auto;
    align-items: flex-start;
    padding-block: 1rem;
  }

  .identity-text {
    max-width: 10rem;
    line-height: 1.2;
  }

  .site-nav ul {
    align-items: flex-end;
    flex-direction: column;
    gap: 0.25rem;
  }

  .page-shell {
    width: min(calc(100% - 1.4rem), var(--content));
  }

  .topic-list,
  .record-grid {
    grid-template-columns: 1fr;
  }

  .topic-list li:nth-child(odd) {
    padding-right: 1.25rem;
  }

  .note-card {
    grid-template-columns: 1fr;
  }

  .article-toc ol {
    columns: 1;
  }

  .architecture-row {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .site-footer {
    grid-template-columns: 1fr;
  }
}

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

@media print {
  .site-header,
  .article-toc,
  .site-footer,
  .skip-link {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }

  .page-shell {
    width: 100%;
    padding: 0;
  }

  .article-layout {
    display: block;
  }

  a {
    color: inherit;
  }
}