@font-face {
  font-family: "IBM Plex Sans";
  src: url("/assets/fonts/IBMPlexSans-Regular.woff2") format("woff2");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Sans";
  src: url("/assets/fonts/IBMPlexSans-Medium.woff2") format("woff2");
  font-style: normal;
  font-weight: 500;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Sans";
  src: url("/assets/fonts/IBMPlexSans-SemiBold.woff2") format("woff2");
  font-style: normal;
  font-weight: 600;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Sans";
  src: url("/assets/fonts/IBMPlexSans-Bold.woff2") format("woff2");
  font-style: normal;
  font-weight: 700;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Sans";
  src: url("/assets/fonts/IBMPlexSans-Italic.woff2") format("woff2");
  font-style: italic;
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Sans";
  src: url("/assets/fonts/IBMPlexSans-BoldItalic.woff2") format("woff2");
  font-style: italic;
  font-weight: 700;
  font-display: swap;
}

:root {
  --ink: #192127;
  --muted: #59636a;
  --line: #dce0e3;
  --accent: #25485e;
  --subtle: #f5f6f7;
  --width: 1120px;
  --font: "IBM Plex Sans", sans-serif;
  font-family: var(--font);
  font-size: 16px;
  font-synthesis: none;
  color: var(--ink);
  background: #fff;
}
* { box-sizing: border-box; }
body { margin: 0; overflow-wrap: anywhere; }
a { color: var(--accent); text-underline-offset: .24em; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, summary:focus-visible { outline: 2px solid #376f93; outline-offset: 5px; }
p { line-height: 1.7; }
h1, h2, h3 { font-weight: 500; line-height: 1.2; letter-spacing: -.025em; }
h1 { font-size: clamp(2.3rem, 4.3vw, 3.4rem); margin: 18px 0 22px; }
h2 { font-size: 1.9rem; }
h3 { font-size: 1.125rem; }
img { max-width: 100%; }
.site-header, .site-footer, .landing, .research-hero, .reader-layout { max-width: var(--width); margin: auto; }
.site-header { display: flex; justify-content: space-between; align-items: center; padding: 25px 0; border-bottom: 1px solid var(--line); gap: 24px; }
.site-header > * { min-width: 0; }
.wordmark { display: flex; align-items: center; gap: 18px; text-decoration: none; font-size: 1.25rem; font-weight: 700; letter-spacing: .05em; color: var(--ink); }
.wordmark span { border-left: 1px solid var(--line); padding-left: 18px; font-size: .75rem; letter-spacing: .12em; font-weight: 400; color: var(--muted); }
.site-header nav { display: flex; gap: 26px; font-size: .875rem; }
.site-header nav a { text-decoration: none; }
.skip { position: absolute; left: 20px; top: -80px; background: white; padding: 16px; z-index: 5; }
.skip:focus { top: 10px; }
.eyebrow, .label { font-size: .75rem; line-height: 1.5; letter-spacing: .09em; color: var(--muted); font-weight: 600; }
.hero { padding: 45px 0 62px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.8fr) minmax(255px, 1fr); gap: 85px; align-items: start; }
.hero h1 { max-width: 560px; }
.hero .lead { max-width: 510px; font-size: 1rem; color: #46515a; line-height: 1.75; }
.actions { display: flex; align-items: center; gap: 27px; flex-wrap: wrap; margin-top: 27px; }
.button { display: inline-flex; align-items: center; justify-content: space-between; gap: 30px; padding: 13px 18px; background: var(--ink); color: white; text-decoration: none; font-size: .875rem; max-width: 100%; }
.button:hover { background: var(--accent); }
.text-link { font-size: .875rem; line-height: 1.6; }
.publication { border-top: 2px solid var(--ink); padding-top: 18px; margin-top: 18px; }
.brand-seal { display: block; width: 132px; height: auto; margin: 0 0 20px; }
.publication .brand-seal { float: right; width: 112px; margin: 0 0 18px 18px; }
.publication dl { clear: both; }
.research-hero .brand-seal { width: 120px; }
.publication h2 { font-size: 1.45rem; margin: 16px 0 22px; }
.publication dl { margin: 0; }
.publication dl div { display: grid; grid-template-columns: 67px 1fr; gap: 12px; padding: 11px 0; border-top: 1px solid var(--line); font-size: .875rem; line-height: 1.5; }
.publication dt, .publication dd span { color: var(--muted); }
.publication dd { margin: 0; }
.research-feature { display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); gap: 72px; align-items: center; padding: 50px 0; border-top: 1px solid var(--line); }
.feature-copy h2 { font-family: inherit; font-size: 2rem; line-height: 1.3; letter-spacing: -.025em; margin: 18px 0 25px; }
.feature-copy p:not(.eyebrow) { max-width: 410px; color: #46515a; margin-bottom: 18px; }
.feature-copy .text-link { display: inline-block; margin-top: 12px; }
.featured-figure { margin: 0; padding-left: 28px; border-left: 1px solid var(--line); }
.featured-figure img { display: block; width: 100%; height: auto; }
.featured-figure figcaption { border-top: 1px solid var(--line); margin-top: 16px; padding-top: 14px; font-size: .875rem; line-height: 1.7; color: var(--muted); }
.featured-figure figcaption span { font-size: .75rem; letter-spacing: .06em; color: var(--ink); margin-right: 13px; }
.scope { border-top: 1px solid var(--line); padding: 48px 0 52px; display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); gap: 72px; }
.scope h2 { max-width: 330px; font-size: 1.8rem; margin: 16px 0 19px; }
.scope-heading > p:not(.eyebrow) { max-width: 360px; color: var(--muted); }
.scope-heading .text-link { display: inline-block; margin-top: 9px; }
.scope-copy article + article { border-top: 1px solid var(--line); padding-top: 22px; margin-top: 24px; }
.scope-copy h3 { margin: 10px 0; }
.scope-copy p { color: #46515a; margin: 0; }
.reading { border-top: 1px solid var(--line); padding: 38px 0 52px; display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); gap: 72px; }
.reading h2 { font-size: 1.65rem; margin: 16px 0; }
.reading-list > a { display: grid; grid-template-columns: 32px 1fr 16px; gap: 17px; color: var(--ink); text-decoration: none; padding: 19px 0; border-bottom: 1px solid var(--line); }
.reading-list > a:first-child { padding-top: 10px; }
.reading-list > a:last-child { border-bottom: 0; }
.reading-list a:hover h3 { text-decoration: underline; text-underline-offset: .2em; }
.reading-list .chapter, .read-arrow { font-size: .875rem; color: var(--muted); padding-top: 3px; }
.reading-list h3 { margin: 0 0 7px; }
.reading-list p { font-size: .875rem; line-height: 1.65; color: var(--muted); margin: 0; }
.site-footer { border-top: 1px solid var(--line); padding: 25px 0 32px; display: flex; justify-content: space-between; align-items: flex-start; gap: 28px; font-size: .875rem; }
.site-footer p { margin: 0; color: var(--muted); }
.site-footer .wordmark { font-size: 1rem; }
.research-hero { padding: 36px 0 28px; }
.research-hero h1 { font-size: clamp(2.1rem, 3.6vw, 2.8rem); max-width: 790px; margin-bottom: 16px; }
.research-hero .lead { font-size: 1rem; color: var(--muted); max-width: 710px; }
.metadata { display: flex; flex-wrap: wrap; gap: 12px 32px; margin: 25px 0; font-size: .875rem; line-height: 1.6; }
.metadata div { border-left: 1px solid var(--line); padding-left: 14px; min-width: 0; }
.metadata dt { color: var(--muted); }
.metadata dd { margin: 2px 0 0; }
.notice { border-left: 2px solid var(--accent); padding: 1px 19px; max-width: 880px; margin: 27px 0 0; }
.notice p { font-size: .875rem; line-height: 1.65; margin: 8px 0; color: #46515a; }
.source-note { font-size: .8125rem; color: var(--muted); line-height: 1.65; margin: 20px 0; max-width: 880px; }
.reader-layout { border-top: 1px solid var(--line); display: grid; grid-template-columns: 225px minmax(0, 1fr); gap: 56px; padding-top: 26px; }
.contents { position: sticky; top: 20px; max-height: calc(100vh - 40px); overflow: auto; padding: 0 12px 20px 0; align-self: start; scrollbar-width: thin; }
.contents summary { font-size: .75rem; font-weight: 700; letter-spacing: .09em; padding: 10px 0; cursor: pointer; }
.contents nav > a, .contents nav details a { display: block; padding: 6px 0; font-size: .875rem; line-height: 1.4; text-decoration: none; color: var(--muted); }
.contents nav a:hover { color: var(--ink); text-decoration: underline; }
.contents nav details summary { font-size: .875rem; letter-spacing: 0; font-weight: 400; color: var(--muted); padding: 6px 0; }
.contents nav details a { padding-left: 12px; }
.paper { max-width: 755px; min-width: 0; padding-bottom: 45px; }
.paper section { scroll-margin-top: 24px; margin-bottom: 52px; }
.paper h2 { font-size: 1.8rem; padding-top: 15px; border-top: 1px solid var(--line); margin: 0 0 22px; }
.paper section:first-child h2 { border-top: 0; }
.paper h3 { font-size: 1.25rem; margin: 30px 0 13px; line-height: 1.35; scroll-margin-top: 24px; }
.paper p, .paper li { font-family: inherit; font-size: 1rem; line-height: 1.8; max-width: 76ch; }
.paper p { margin: 0 0 17px; }
.paper li { margin: 8px 0; }
.paper .citation { font-family: inherit; font-size: .75em; vertical-align: super; text-decoration: none; }
.paper figure { margin: 30px 0 34px; scroll-margin-top: 20px; }
.paper figure img { display: block; width: 100%; height: auto; }
.paper figcaption { font-size: .875rem; line-height: 1.7; color: var(--muted); padding: 13px 0; border-bottom: 1px solid var(--line); }
.figure-link { display: block; }
.figure-full { display: inline-block; margin-top: 8px; font-size: .875rem; }
.table-scroll { overflow: auto; max-width: 100%; margin: 22px 0 28px; }
.paper table { border-collapse: collapse; width: 100%; min-width: 550px; font-size: .875rem; line-height: 1.65; }
.paper th, .paper td { border-bottom: 1px solid var(--line); padding: 13px; vertical-align: top; text-align: left; }
.paper th { background: var(--subtle); font-weight: 600; }
.paper td p { font: inherit; margin: 0 0 8px; }
.paper a { overflow-wrap: anywhere; }
.table-caption { font-family: inherit !important; font-size: .875rem !important; font-weight: 600; }
.paper #references p { font-family: inherit; font-size: .875rem; line-height: 1.7; }
.paper #references .reference { margin-top: 26px; }
.paper .section-jump { font-family: inherit; font-size: .8125rem; text-decoration: none; float: right; margin-top: 10px; }
.not-found { max-width: 800px; min-height: 65vh; margin: auto; padding: 90px 24px; }
.not-found h1 { font-size: 2.5rem; }
@media (max-width: 1200px) {
  .site-header, .site-footer, .landing, .research-hero, .reader-layout { margin-left: 36px; margin-right: 36px; }
  .hero-grid { gap: 45px; }
  .research-feature, .scope, .reading { gap: 45px; }
  .reader-layout { gap: 35px; grid-template-columns: 210px minmax(0, 1fr); }
}
@media (max-width: 850px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr) minmax(210px, .7fr); gap: 35px; }
  .hero { padding: 32px 0 42px; }
  .hero h1 { font-size: 2.55rem; }
  .research-feature { gap: 30px; }
  .feature-copy h2 { font-size: 1.7rem; }
  .featured-figure { padding-left: 16px; }
  .reader-layout { display: block; padding-top: 12px; }
  .contents { position: static; max-height: none; padding: 0 0 22px; }
  .contents > summary { display: list-item; }
  .contents nav { columns: 2; column-gap: 25px; padding: 8px 0; }
  .contents nav > a, .contents nav details { break-inside: avoid; }
  .paper { max-width: none; }
}
@media (min-width: 851px) {
  .contents > summary { list-style: none; }
  .contents > summary::-webkit-details-marker { display: none; }
}
@media (max-width: 650px) {
  .site-header, .site-footer, .landing, .research-hero, .reader-layout { margin-left: 22px; margin-right: 22px; }
  .site-header { padding: 20px 0; align-items: flex-start; }
  .wordmark { font-size: 1.1rem; display: block; }
  .wordmark span { display: block; border: 0; padding: 6px 0 0; font-size: .75rem; }
  .site-header nav { gap: 11px; flex-direction: column; font-size: .875rem; text-align: right; }
  .hero-grid, .research-feature, .scope, .reading { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .hero h1 { font-size: 2.35rem; max-width: 440px; }
  .publication { margin-top: 10px; }
  .publication h2 { font-size: 1.3rem; margin: 14px 0; }
  .actions { gap: 22px; }
  .research-feature, .scope { padding: 32px 0; }
  .feature-copy h2 { font-size: 1.75rem; }
  .feature-copy p:not(.eyebrow), .scope-heading > p:not(.eyebrow) { max-width: none; }
  .featured-figure { padding: 0; border: 0; }
  .scope h2 { font-size: 1.65rem; max-width: none; }
  .scope-copy { border-top: 1px solid var(--line); padding-top: 23px; }
  .reading { padding: 28px 0 38px; gap: 12px; }
  .reading h2 { font-size: 1.5rem; }
  .site-footer { flex-wrap: wrap; }
  .site-footer p { width: 100%; order: 3; }
  .metadata { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
  .research-hero { padding-top: 28px; }
  .research-hero h1 { font-size: 2.1rem; }
  .notice { padding-left: 14px; }
  .contents nav { columns: 1; }
  .paper h2 { font-size: 1.6rem; }
  .paper h3 { font-size: 1.1875rem; }
  .paper .section-jump { float: none; display: block; margin: 0 0 13px; }
}
@media print {
  .site-header, .site-footer, .contents, .actions, .skip, .section-jump, .figure-full { display: none !important; }
  .reader-layout { display: block; margin: 0; border: 0; }
  .research-hero { margin: 0; }
  .paper { max-width: none; }
  .paper p, .paper li { font-size: 11pt; line-height: 1.5; }
  .paper figure, .paper table { break-inside: avoid; }
  .paper h2, .paper h3 { break-after: avoid; }
  .paper section { margin-bottom: 24px; }
  a { color: inherit; text-decoration: none; }
  .table-scroll { overflow: visible; }
}