@font-face {
  font-family: "Newsreader";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/newsreader-latin-400-normal.woff2") format("woff2");
}

@font-face {
  font-family: "Newsreader";
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/newsreader-latin-400-italic.woff2") format("woff2");
}

@font-face {
  font-family: "Newsreader";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("../fonts/newsreader-latin-600-normal.woff2") format("woff2");
}

@font-face {
  font-family: "Newsreader";
  font-style: italic;
  font-weight: 600;
  font-display: swap;
  src: url("../fonts/newsreader-latin-600-italic.woff2") format("woff2");
}

:root {
  --paper: #f3f2ed;
  --surface: #fbfaf7;
  --ink: #22211f;
  --muted: #66645f;
  --line: #cbc7bd;
  --line-light: #ddd9d0;
  --accent: #7a3434;
  --accent-dark: #5e2828;
  --sage: #64716b;
  --font: "Newsreader", Georgia, serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

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

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

.shell,
.header-inner {
  width: min(1060px, calc(100% - 48px));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 8px 12px;
  background: var(--ink);
  color: #fff;
  transform: translateY(-160%);
}

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

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid rgba(203, 199, 189, 0.88);
  background: rgba(243, 242, 237, 0.96);
  backdrop-filter: blur(12px);
}

.header-inner {
  display: flex;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
}

.wordmark:hover {
  color: var(--ink);
}

.wordmark-name {
  font-size: 1.12rem;
  font-weight: 600;
  letter-spacing: -0.015em;
}

.wordmark-field {
  color: var(--muted);
  font-size: 0.77rem;
  font-style: italic;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav a {
  position: relative;
  padding: 23px 0 20px;
  color: #474541;
  font-size: 0.94rem;
  text-decoration: none;
}

.site-nav a::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  background: var(--accent);
  content: "";
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 160ms ease;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--ink);
}

.site-nav a:hover::after,
.site-nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(240px, 0.7fr);
  align-items: center;
  gap: 72px;
  min-height: 620px;
  padding-block: 72px 84px;
}

.hero-copy {
  max-width: 730px;
}

.hero h1 {
  margin-bottom: 18px;
  font-size: clamp(3.35rem, 6vw, 4.65rem);
  font-weight: 400;
  letter-spacing: -0.045em;
  line-height: 0.96;
}

.hero-lede {
  max-width: 700px;
  margin-bottom: 28px;
  color: #45423e;
  font-size: 1.16rem;
  line-height: 1.63;
}

.hero-lede a {
  text-decoration-color: rgba(122, 52, 52, 0.45);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
}

.portrait-block {
  width: min(100%, 260px);
  justify-self: end;
}

.portrait-frame {
  position: relative;
  padding: 10px;
  border: 1px solid var(--line);
  background: var(--surface);
}

.portrait-frame img {
  display: block;
  width: 100%;
  height: auto;
  filter: saturate(0.78) contrast(1.03);
}

.portrait-caption {
  display: flex;
  justify-content: space-between;
  margin-top: 15px;
  color: var(--muted);
  font-size: 0.77rem;
  font-style: italic;
}

.research-band {
  border-block: 1px solid var(--line);
  background: var(--surface);
}

.research-grid {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 64px;
  padding-block: 68px 72px;
}

.research-grid h2,
.section-heading h2,
.paper-section-title h2 {
  margin-bottom: 0;
  font-size: clamp(1.72rem, 3vw, 2.25rem);
  font-weight: 400;
  letter-spacing: -0.025em;
  line-height: 1.12;
}

.topic-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}

.topic-list article {
  min-height: 138px;
  padding: 19px 24px 20px 0;
  border-bottom: 1px solid var(--line);
}

.topic-list article:nth-child(odd) {
  padding-right: 28px;
  border-right: 1px solid var(--line);
}

.topic-list article:nth-child(even) {
  padding-left: 28px;
}

.topic-list h3 {
  margin-bottom: 7px;
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.2;
}

.topic-list p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.48;
}

.selected-section,
.event-section {
  padding-block: 76px 84px;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 36px;
  margin-bottom: 34px;
}

.text-link {
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
}

.selected-grid {
  display: block;
  border-top: 1px solid var(--line);
}

.selected-card {
  display: grid;
  grid-template-columns: 165px minmax(0, 1fr) 135px;
  gap: 4px 28px;
  min-height: 0;
  padding: 22px 0 23px;
  border-bottom: 1px solid var(--line);
  background: transparent;
}

.selected-card-feature {
  background: transparent;
}

.paper-status {
  grid-column: 1;
  grid-row: 1 / span 2;
  margin-bottom: 0;
  padding-top: 3px;
  color: var(--accent);
  font-size: 0.8rem;
  font-style: italic;
  line-height: 1.35;
}

.selected-card h3 {
  grid-column: 2;
  margin-bottom: 0;
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.018em;
  line-height: 1.22;
}

.selected-card p:not(.paper-status) {
  grid-column: 2;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.91rem;
  line-height: 1.48;
}

.selected-card > a {
  grid-column: 3;
  grid-row: 1 / span 2;
  justify-self: end;
  margin-top: 2px;
  color: var(--accent);
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
}

.ai-callout {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  gap: 72px;
  margin-bottom: 84px;
  padding: 34px 38px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: transparent;
}

.ai-callout h2 {
  margin-bottom: 0;
  font-size: 1.72rem;
  font-weight: 400;
  letter-spacing: -0.025em;
  line-height: 1.1;
}

.ai-callout > div:last-child p {
  margin-bottom: 17px;
  color: var(--muted);
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #e9e7e0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr auto;
  gap: 48px;
  padding-block: 38px 42px;
}

.footer-grid p {
  margin-bottom: 0;
  color: #55524d;
  font-size: 0.86rem;
  line-height: 1.45;
}

.footer-grid strong {
  color: var(--ink);
  font-size: 1rem;
  font-weight: 600;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 20px;
  align-items: start;
  max-width: 390px;
}

.footer-links a {
  color: var(--ink);
  font-size: 0.86rem;
  text-decoration: none;
}

/* Interior pages */
.page-hero {
  padding-block: 64px 72px;
}

.page-hero-grid {
  display: grid;
  grid-template-columns: minmax(240px, 0.85fr) minmax(0, 1.15fr);
  align-items: end;
  gap: 72px;
}

.page-hero h1 {
  margin-bottom: 0;
  font-size: clamp(2.85rem, 6vw, 4.35rem);
  font-weight: 400;
  letter-spacing: -0.05em;
  line-height: 0.96;
}

.page-hero-grid > p,
.page-hero-grid > div > p {
  max-width: 620px;
  margin-bottom: 4px;
  color: #4d4a45;
  font-size: 1.08rem;
  line-height: 1.58;
}

.paper-section {
  padding-block: 66px 78px;
  border-top: 1px solid var(--line);
}

.paper-section-tinted {
  background: var(--surface);
}

.paper-section-title {
  margin-bottom: 30px;
}

.paper-list {
  border-top: 1px solid var(--line);
}

.paper-list-preprints {
  border-top-color: var(--ink);
}

.paper-row {
  display: grid;
  grid-template-columns: 185px minmax(0, 1fr) 56px;
  gap: 28px;
  align-items: start;
  padding: 24px 0 25px;
  border-bottom: 1px solid var(--line-light);
}

.paper-row h3 {
  margin-bottom: 5px;
  font-size: 1.22rem;
  font-weight: 600;
  letter-spacing: -0.012em;
  line-height: 1.3;
}

.paper-meta {
  padding-top: 4px;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0;
  line-height: 1.45;
}

.paper-authors {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.43;
}

.paper-link {
  padding-top: 2px;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
  text-align: right;
  text-decoration: none;
}

.year-group {
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr);
  gap: 48px;
  margin-top: 46px;
}

.year-group:first-of-type {
  margin-top: 0;
}

.year-label {
  padding-top: 14px;
  color: var(--accent);
  font-size: 1.18rem;
  font-style: italic;
}

.year-group .paper-row {
  grid-template-columns: 185px minmax(0, 1fr) 56px;
}

/* AI and mathematics */
.page-hero-ai {
  border-bottom: 1px solid var(--line);
}

.event-list {
  border-top: 2px solid var(--ink);
}

.event-card {
  display: grid;
  grid-template-columns: 125px minmax(0, 1fr) 70px;
  gap: 32px;
  padding: 30px 0 32px;
  border-bottom: 1px solid var(--line);
}

.event-card-current {
  border-bottom-color: var(--accent);
}

.event-date strong,
.event-date span {
  display: block;
}

.event-date strong {
  margin-bottom: 2px;
  color: var(--accent);
  font-size: 1.25rem;
  font-weight: 600;
}

.event-date span {
  color: var(--muted);
  font-size: 0.8rem;
  font-style: italic;
}

.event-topline {
  display: flex;
  flex-wrap: wrap;
  gap: 9px 15px;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 0.77rem;
}

.event-tag {
  color: var(--accent);
  font-style: italic;
}

.event-main h3 {
  margin-bottom: 9px;
  font-size: 1.38rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.event-main > p {
  max-width: 700px;
  margin-bottom: 10px;
  color: #55514c;
  font-size: 0.96rem;
  line-height: 1.5;
}

.tool-note {
  padding-left: 14px;
  border-left: 2px solid var(--accent);
}

.tool-note a {
  color: var(--accent);
  font-weight: 600;
}

.event-link {
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
  text-align: right;
  text-decoration: none;
}

.not-found-action {
  margin-top: 24px;
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: minmax(0, 1fr) 230px;
    gap: 40px;
    min-height: auto;
  }

  .research-grid {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 36px;
  }

  .selected-card {
    grid-template-columns: 135px minmax(0, 1fr) 120px;
  }

  .page-hero-grid {
    gap: 42px;
  }

  .year-group {
    grid-template-columns: 82px minmax(0, 1fr);
    gap: 30px;
  }

  .paper-row,
  .year-group .paper-row {
    grid-template-columns: 150px minmax(0, 1fr) 50px;
    gap: 20px;
  }
}

@media (max-width: 700px) {
  body {
    font-size: 16px;
  }

  .shell,
  .header-inner {
    width: min(100% - 32px, 1060px);
  }

  .header-inner {
    min-height: 64px;
    gap: 18px;
  }

  .wordmark-field {
    display: none;
  }

  .site-nav {
    gap: 17px;
  }

  .site-nav a {
    padding-block: 20px 17px;
    font-size: 0.86rem;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 42px;
    padding-block: 54px 60px;
  }

  .hero-copy {
    max-width: none;
  }

  .hero h1 {
    font-size: clamp(3rem, 16vw, 4.25rem);
  }

  .hero-lede {
    font-size: 1.05rem;
  }

  .portrait-block {
    width: min(76%, 260px);
    justify-self: center;
  }

  .research-grid,
  .page-hero-grid,
  .paper-section-title,
  .ai-callout {
    grid-template-columns: 1fr;
  }

  .research-grid,
  .selected-section,
  .event-section,
  .paper-section {
    padding-block: 52px 58px;
  }

  .research-grid,
  .ai-callout {
    gap: 30px;
  }

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

  .topic-list article {
    min-height: auto;
    padding: 19px 0 20px;
    border-right: 0;
  }

  .topic-list article:nth-child(odd),
  .topic-list article:nth-child(even) {
    padding-right: 0;
    padding-left: 0;
    border-right: 0;
  }

  .section-heading {
    align-items: start;
    flex-direction: column;
    gap: 16px;
  }

  .ai-callout {
    margin-bottom: 58px;
    padding: 28px 24px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .page-hero {
    padding-block: 52px 58px;
  }

  .page-hero-grid {
    align-items: start;
    gap: 28px;
  }

  .page-hero h1 {
    font-size: clamp(2.8rem, 14vw, 4.2rem);
  }

  .paper-section-title {
    gap: 8px;
  }

  .year-group {
    grid-template-columns: 1fr;
    gap: 7px;
    margin-top: 40px;
  }

  .paper-row,
  .year-group .paper-row {
    grid-template-columns: 1fr auto;
    gap: 8px 20px;
  }

  .paper-meta {
    grid-column: 1 / -1;
  }

  .paper-link {
    grid-column: 2;
    grid-row: 2;
  }

  .event-card {
    grid-template-columns: 1fr auto;
    gap: 14px 20px;
    padding-block: 25px 27px;
  }

  .event-date {
    grid-column: 1;
  }

  .event-link {
    grid-column: 2;
    grid-row: 1;
  }

  .event-main {
    grid-column: 1 / -1;
  }

  .selected-card {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 7px 18px;
  }

  .paper-status {
    grid-column: 1;
    grid-row: 1;
    padding-top: 0;
  }

  .selected-card h3 {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  .selected-card p:not(.paper-status) {
    grid-column: 1 / -1;
    grid-row: 3;
  }

  .selected-card > a {
    grid-column: 2;
    grid-row: 1;
    margin-top: 0;
  }
}

@media (max-width: 430px) {
  .header-inner {
    align-items: start;
    flex-direction: column;
    gap: 4px;
    padding-top: 13px;
  }

  .site-nav {
    width: 100%;
  }

  .site-nav a {
    padding-block: 8px 11px;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}