:root {
  --paper: #fbfaf7;
  --ink: #202420;
  --muted: #686e69;
  --line: #deddd7;
  --accent: #155f4b;
  --serif: "Source Sans 3", "Source Sans Pro", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --sans: "Source Sans 3", "Source Sans Pro", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --max-width: 880px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent);
  text-decoration-color: rgba(21, 95, 75, 0.42);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 10;
  top: 12px;
  left: 12px;
  padding: 8px 12px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--sans);
  font-size: 0.75rem;
  transform: translateY(-160%);
}

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

.site-shell {
  width: min(calc(100% - 56px), var(--max-width));
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 234px;
  column-gap: clamp(42px, 8vw, 78px);
  row-gap: 0;
  align-items: center;
  padding: clamp(72px, 10vw, 106px) 0 clamp(70px, 9vw, 94px);
}

.profile-photo {
  position: relative;
  transform: translateX(-21px);
  width: 234px;
  aspect-ratio: 1;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: #202722;
}

.profile-photo img {
  position: absolute;
  top: 44%;
  left: 50%;
  width: 300%;
  max-width: none;
  height: auto;
  transform: translate(-54%, -55%);
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  font-family: var(--sans);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1 {
  margin: 14px 0 24px;
  font-size: clamp(2.6rem, 5.4vw, 3.8rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 0.98;
}

.introduction {
  max-width: 750px;
  margin: 0;
  color: #343a35;
  font-size: clamp(0.87rem, 1.63vw, 1.01rem);
  line-height: 1.58;
}

.hero-links {
  display: flex;
  gap: 14px;
  align-items: center;
  margin: 45px 0 0;
  font-family: var(--sans);
  font-size: 1.01rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.hero-links a {
  text-decoration: underline;
  text-decoration-color: rgba(21, 95, 75, 0.42);
  text-underline-offset: 0.26em;
}

.hero-links .divider {
  color: var(--line);
}

.research {
  padding: 0 0 82px;
}

.section-heading {
  margin-bottom: 54px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--ink);
}

h2 {
  margin: 0;
  font-size: clamp(1.8rem, 3.6vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
}

.research-group + .research-group {
  margin-top: 66px;
}

.research-group h3 {
  margin: 0 0 12px;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.055em;
  text-transform: uppercase;
}

.research-item {
  padding: 25px 0 29px;
  border-top: 1px solid var(--line);
}

.research-group .research-item:last-child {
  border-bottom: 1px solid var(--line);
}

h4 {
  max-width: 800px;
  margin: 0;
  font-size: clamp(1.22rem, 2.25vw, 1.5rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.34;
}

.paper-meta {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.86rem;
  font-style: italic;
}

.paper-meta span {
  padding: 0 0.28em;
  font-style: normal;
}

.paper-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 7px;
  align-items: flex-start;
  margin-top: 14px;
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 600;
}

.paper-actions > a,
summary {
  cursor: pointer;
  text-decoration: underline;
  text-decoration-color: rgba(21, 95, 75, 0.42);
  text-underline-offset: 0.26em;
}

details {
  display: contents;
}

details[open] {
  display: block;
  flex-basis: 100%;
}

summary {
  width: max-content;
  color: var(--accent);
}

summary::marker {
  content: "";
}

summary::after {
  content: " +";
  display: inline-block;
  margin-left: 0.2em;
}

details[open] summary::after {
  content: " −";
}

details p {
  max-width: 730px;
  margin: 20px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
  color: #505651;
  font-family: var(--serif);
  font-size: 0.92rem;
  font-weight: 400;
  line-height: 1.68;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 24px 0 36px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.64rem;
  letter-spacing: 0.055em;
  text-transform: uppercase;
}

footer p {
  margin: 0;
}

#update-note {
  opacity: 0.72;
}

@media (max-width: 620px) {
  .site-shell {
    width: min(calc(100% - 32px), var(--max-width));
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 34px;
    padding: 58px 0 62px;
  }

  .profile-photo {
    grid-row: 1;
    transform: none;
    width: 174px;
  }

  .hero-copy {
    grid-row: 2;
  }

  h1 {
    font-size: clamp(2.6rem, 12.6vw, 3.4rem);
  }

  .research {
    padding: 0 0 64px;
  }

  .section-heading {
    margin-bottom: 44px;
  }

  .research-group + .research-group {
    margin-top: 54px;
  }

  footer {
    display: block;
  }

  footer p + p {
    margin-top: 5px;
  }
}

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

@media print {
  body {
    background: #fff;
    color: #000;
  }

  .site-shell {
    width: 100%;
  }

  details {
    display: block;
  }

  details p {
    display: block;
  }
}