@font-face {
  font-family: "Cormorant Garamond";
  src: url("../fonts/cormorant-garamond-500.ttf") format("truetype");
  font-style: normal;
  font-weight: 500;
  font-display: swap;
}

@font-face {
  font-family: "Cormorant Garamond";
  src: url("../fonts/cormorant-garamond-600.ttf") format("truetype");
  font-style: normal;
  font-weight: 600;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Sans";
  src: url("../fonts/ibm-plex-sans-300.ttf") format("truetype");
  font-style: normal;
  font-weight: 300;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Sans";
  src: url("../fonts/ibm-plex-sans-400.ttf") format("truetype");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Sans";
  src: url("../fonts/ibm-plex-sans-500.ttf") format("truetype");
  font-style: normal;
  font-weight: 500;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Sans";
  src: url("../fonts/ibm-plex-sans-600.ttf") format("truetype");
  font-style: normal;
  font-weight: 600;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Mono";
  src: url("../fonts/ibm-plex-mono-400.ttf") format("truetype");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Mono";
  src: url("../fonts/ibm-plex-mono-500.ttf") format("truetype");
  font-style: normal;
  font-weight: 500;
  font-display: swap;
}

:root {
  --ink: #17191c;
  --muted: #60666d;
  --line: #dfe2e5;
  --soft: #f5f6f7;
  --accent: #5262b5;
  --accent-dark: #3f4d94;
  --white: #ffffff;
  --content: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: "IBM Plex Sans", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
a:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 8px 12px;
  color: var(--white);
  background: var(--ink);
  transform: translateY(-150%);
}

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

.container,
.header-inner {
  width: min(calc(100% - 48px), var(--content));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid rgba(223, 226, 229, 0.9);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
}

.header-inner {
  display: flex;
  min-height: 68px;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.wordmark {
  text-decoration: none;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.86rem;
  font-weight: 500;
  letter-spacing: 0.12em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 26px;
}

.site-nav a {
  color: #444a50;
  text-decoration: none;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.site-nav a:hover {
  color: var(--accent);
}

.nav-toggle {
  display: none;
  border: 0;
  padding: 8px 0;
  background: transparent;
  font: 500 0.78rem/1 "IBM Plex Mono", monospace;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.hero {
  padding: clamp(80px, 10vw, 144px) 0 clamp(76px, 9vw, 126px);
  border-bottom: 1px solid var(--line);
}

.hero-inner {
  max-width: 1030px;
  text-align: center;
}

.eyebrow,
.section-index,
.card-label {
  margin: 0 0 20px;
  color: var(--accent);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.76rem;
  font-weight: 500;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  font-family: "Cormorant Garamond", serif;
  font-weight: 500;
  line-height: 1.04;
}

h1 {
  max-width: 1000px;
  margin: 0 auto 34px;
  font-size: clamp(3.15rem, 6.4vw, 6.2rem);
  letter-spacing: -0.045em;
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(2.4rem, 4.5vw, 4.35rem);
  letter-spacing: -0.035em;
}

h3 {
  font-size: 1.75rem;
}

.authors {
  display: flex;
  margin-bottom: 7px;
  align-items: center;
  justify-content: center;
  gap: 10px 26px;
  flex-wrap: wrap;
  font-size: 1.04rem;
}

.authors a {
  color: var(--accent-dark);
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}

.authors span:not(:last-child)::after,
.authors a::after {
  content: "·";
  position: absolute;
  margin-left: 12px;
  color: #a2a7ad;
  text-decoration: none;
}

.affiliation {
  margin-bottom: 30px;
  color: var(--muted);
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
}

.button {
  display: inline-flex;
  min-height: 46px;
  padding: 0 22px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--ink);
  text-decoration: none;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.76rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.button-primary {
  color: var(--white);
  background: var(--ink);
}

.button-primary:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
}

.button-secondary:hover {
  color: var(--accent-dark);
  border-color: var(--accent-dark);
}

.section {
  padding: clamp(78px, 9vw, 132px) 0;
  border-bottom: 1px solid var(--line);
}

.section-first {
  padding-top: clamp(48px, 6vw, 88px);
}

.section-muted {
  background: var(--soft);
}

.section-dark {
  color: #f7f7f7;
  background: #1a1c1f;
  border-bottom-color: #1a1c1f;
}

.section-dark .section-index {
  color: #aab4ec;
}

.section-dark .split-heading > p {
  color: #bbc0c7;
}

.section-heading {
  max-width: 760px;
  margin-bottom: clamp(42px, 6vw, 74px);
}

.split-heading {
  display: grid;
  max-width: none;
  align-items: end;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: clamp(34px, 8vw, 100px);
}

.split-heading h2 {
  margin-bottom: 0;
}

.split-heading > p,
.heading-note {
  margin-bottom: 3px;
  color: var(--muted);
  font-size: 1.06rem;
}

.figure-frame {
  margin-bottom: clamp(66px, 8vw, 104px);
  border: 1px solid var(--line);
  padding: clamp(12px, 2vw, 24px);
  background: var(--white);
}

.figure-scroll {
  max-width: 100%;
  overflow-x: auto;
  scrollbar-width: thin;
}

.principles {
  display: grid;
  border-top: 1px solid var(--line);
  grid-template-columns: repeat(3, 1fr);
}

.principles article {
  padding: 34px 34px 0 0;
}

.principles article + article {
  border-left: 1px solid var(--line);
  padding-left: 34px;
}

.principles span {
  color: var(--accent);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.principles h3 {
  margin: 14px 0 12px;
}

.principles p,
.media-copy p {
  color: var(--muted);
}

.media-layout {
  display: grid;
  align-items: center;
  grid-template-columns: minmax(280px, 0.72fr) minmax(0, 1.28fr);
  gap: clamp(48px, 8vw, 110px);
}

.paper-figure {
  margin: 0;
}

.paper-figure img {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--white);
}

.paper-figure figcaption {
  margin-top: 12px;
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.7rem;
  letter-spacing: 0.03em;
}

.method-figure {
  margin-bottom: 34px;
}

.method-steps {
  display: grid;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  grid-template-columns: repeat(4, 1fr);
}

.method-steps div {
  display: flex;
  padding: 22px 20px;
  align-items: baseline;
  gap: 12px;
}

.method-steps div + div {
  border-left: 1px solid var(--line);
}

.method-steps span {
  color: var(--accent);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
}

.method-steps strong {
  font-size: 0.88rem;
  font-weight: 500;
}

.metrics {
  display: grid;
  margin-bottom: clamp(56px, 7vw, 90px);
  border-top: 1px solid #42464b;
  border-bottom: 1px solid #42464b;
  grid-template-columns: repeat(4, 1fr);
}

.metrics article {
  padding: 28px 24px 30px;
}

.metrics article + article {
  border-left: 1px solid #42464b;
}

.metrics strong {
  display: block;
  margin-bottom: 4px;
  color: var(--white);
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(2.25rem, 4vw, 3.6rem);
  font-weight: 500;
  line-height: 1;
}

.metrics span {
  color: #adb2b8;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 46px 32px;
}

.result-grid .paper-figure img {
  border-color: #3b3e42;
}

.result-grid .paper-figure figcaption {
  color: #afb4ba;
}

.result-wide {
  grid-column: 1 / -1;
}

.application-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.application-card {
  display: grid;
  min-width: 0;
  border: 1px solid var(--line);
  grid-template-columns: minmax(0, 1.9fr) minmax(310px, 0.75fr);
  background: var(--white);
}

.application-card figure {
  display: flex;
  min-height: 420px;
  margin: 0;
  padding: clamp(18px, 2.5vw, 34px);
  align-items: center;
  border-right: 1px solid var(--line);
  background: #fafafa;
}

.application-card figure img {
  width: 100%;
}

.application-copy {
  display: flex;
  height: 100%;
  padding: clamp(30px, 4vw, 52px);
  flex-direction: column;
}

.application-copy h3 {
  margin-bottom: 25px;
}

.application-copy dl {
  margin: auto 0 0;
}

.application-copy dl div {
  display: flex;
  padding: 11px 0;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
  border-top: 1px solid var(--line);
}

.application-copy dt {
  color: var(--muted);
  font-size: 0.82rem;
}

.application-copy dd {
  margin: 0;
  font-family: "IBM Plex Mono", monospace;
  font-weight: 500;
}

.metric-note {
  margin: 8px 0 0;
  color: var(--muted);
  text-align: right;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.7rem;
}

.citation-layout {
  display: grid;
  align-items: start;
  grid-template-columns: minmax(250px, 0.62fr) minmax(0, 1.38fr);
  gap: clamp(46px, 8vw, 100px);
}

.citation-layout > div:first-child p:not(.section-index) {
  color: var(--muted);
}

.text-link {
  color: var(--accent-dark);
  text-underline-offset: 5px;
}

.citation-box {
  position: relative;
  min-width: 0;
  border: 1px solid var(--line);
  background: var(--white);
}

.citation-box button {
  position: absolute;
  top: 14px;
  right: 14px;
  border: 1px solid var(--line);
  padding: 8px 11px;
  color: var(--ink);
  background: var(--white);
  font: 500 0.7rem/1 "IBM Plex Mono", monospace;
  cursor: pointer;
}

.citation-box button:hover {
  color: var(--accent-dark);
  border-color: var(--accent);
}

.citation-box pre {
  margin: 0;
  padding: 58px 24px 24px;
  overflow-x: auto;
  font: 400 0.74rem/1.7 "IBM Plex Mono", monospace;
  white-space: pre;
}

#copy-status {
  min-height: 20px;
  margin: 0;
  padding: 0 24px 12px;
  color: var(--accent-dark);
  font: 400 0.7rem/1.4 "IBM Plex Mono", monospace;
}

.site-footer {
  padding: 30px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.footer-inner p {
  margin: 0;
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.68rem;
}

@media (max-width: 900px) {
  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 68px;
    right: 0;
    left: 0;
    display: none;
    padding: 12px 24px 22px;
    align-items: stretch;
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    gap: 0;
    background: var(--white);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 11px 0;
  }

  .split-heading,
  .media-layout,
  .citation-layout {
    grid-template-columns: 1fr;
  }

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

  .principles article {
    padding: 28px 0;
  }

  .principles article + article {
    border-top: 1px solid var(--line);
    border-left: 0;
    padding-left: 0;
  }

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

  .metrics article:nth-child(3) {
    border-top: 1px solid #42464b;
    border-left: 0;
  }

  .metrics article:nth-child(4) {
    border-top: 1px solid #42464b;
  }

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

  .application-card figure {
    min-height: 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
}

@media (max-width: 620px) {
  .container,
  .header-inner {
    width: min(calc(100% - 32px), var(--content));
  }

  .hero {
    padding-top: 72px;
  }

  h1 {
    font-size: clamp(2.65rem, 13vw, 4rem);
  }

  h2 {
    font-size: clamp(2.2rem, 11vw, 3.1rem);
  }

  .authors {
    flex-direction: column;
    gap: 5px;
  }

  .authors span::after,
  .authors a::after {
    content: none !important;
  }

  .hero-actions {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .figure-scroll img {
    width: auto;
    max-width: none;
  }

  #overview .figure-scroll img {
    height: 260px;
  }

  .method-figure img {
    height: 520px;
  }

  .method-steps,
  .result-grid {
    grid-template-columns: 1fr;
  }

  .method-steps div + div {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

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

  .metrics article + article,
  .metrics article:nth-child(3) {
    border-top: 1px solid #42464b;
    border-left: 0;
  }

  .result-wide {
    grid-column: auto;
  }

  .application-card {
    display: grid;
  }

  .application-card figure {
    padding: 12px;
  }

  .citation-box pre {
    font-size: 0.68rem;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}

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