:root {
  --paper: #f6f7f4;
  --surface: #ecefeb;
  --ink: #18201e;
  --muted: #69726e;
  --line: #cfd5d1;
  --accent: #167d74;
  --accent-dark: #0e5d56;
  --serif: "Newsreader", "Noto Serif SC", Georgia, serif;
  --sans: "DM Sans", "Noto Sans SC", Arial, sans-serif;
  --max-width: 1240px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  letter-spacing: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  color: inherit;
  font: inherit;
}

.skip-link {
  position: fixed;
  top: -60px;
  left: 20px;
  z-index: 100;
  padding: 8px 14px;
  background: var(--ink);
  color: #fff;
  transition: top 180ms ease;
}

.skip-link:focus {
  top: 12px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid transparent;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(16px);
  transition: border-color 200ms ease;
}

.site-header.scrolled {
  border-color: var(--line);
}

.nav-wrap {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  width: min(calc(100% - 64px), var(--max-width));
  height: 78px;
  margin: 0 auto;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  width: max-content;
  gap: 12px;
  font-weight: 600;
}

.wordmark-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid var(--ink);
  font-size: 11px;
}

.desktop-nav {
  display: flex;
  gap: 34px;
  font-size: 14px;
}

.desktop-nav a,
.mobile-nav a {
  transition: color 160ms ease;
}

.desktop-nav a:hover,
.mobile-nav a:hover {
  color: var(--accent);
}

.nav-actions {
  display: flex;
  justify-self: end;
  align-items: center;
  gap: 20px;
}

.lang-toggle,
.menu-toggle {
  border: 0;
  background: none;
  cursor: pointer;
}

.lang-toggle {
  display: flex;
  gap: 6px;
  padding: 8px 0;
  color: var(--muted);
  font-size: 12px;
}

.lang-option.active {
  color: var(--ink);
  font-weight: 600;
}

.menu-toggle {
  display: none;
  width: 34px;
  height: 34px;
  padding: 8px 5px;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 1px;
  margin: 6px 0;
  background: var(--ink);
  transition: transform 180ms ease;
}

.menu-toggle[aria-expanded="true"] span:first-child {
  transform: translateY(3.5px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-3.5px) rotate(-45deg);
}

.mobile-nav {
  display: none;
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  align-items: center;
  column-gap: clamp(56px, 8vw, 126px);
  width: min(calc(100% - 64px), var(--max-width));
  min-height: calc(100vh - 138px);
  margin: 0 auto;
  padding: 56px 0 100px;
}

.hero-copy {
  max-width: 700px;
}

.eyebrow {
  margin: 0 0 24px;
  color: var(--accent-dark);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(72px, 10vw, 144px);
  font-weight: 400;
  line-height: 0.82;
  letter-spacing: 0;
}

.accent-dot {
  color: var(--accent);
}

.hero-intro {
  max-width: 610px;
  margin: 48px 0 0;
  font-family: var(--serif);
  font-size: clamp(26px, 3vw, 42px);
  line-height: 1.25;
}

.hero-links {
  display: flex;
  gap: 30px;
  margin-top: 44px;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--accent);
  color: var(--accent-dark);
  font-size: 14px;
  font-weight: 600;
}

.text-link.muted {
  border-color: var(--line);
  color: var(--ink);
}

.portrait-wrap {
  align-self: center;
  margin: 0;
}

.portrait-frame {
  position: relative;
  aspect-ratio: 4 / 5;
  overflow: hidden;
  background: var(--surface);
}

.portrait-frame::after {
  position: absolute;
  inset: 0;
  border: 1px solid rgba(24, 32, 30, 0.12);
  content: "";
  pointer-events: none;
}

.portrait-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 16%;
  filter: saturate(0.88) contrast(0.98);
}

.portrait-wrap figcaption {
  display: flex;
  justify-content: space-between;
  margin-top: 12px;
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
}

.scroll-cue {
  position: absolute;
  bottom: 34px;
  left: 0;
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
}

.scroll-line {
  display: block;
  width: 74px;
  height: 1px;
  overflow: hidden;
  background: var(--line);
}

.scroll-line::after {
  display: block;
  width: 100%;
  height: 1px;
  background: var(--accent);
  content: "";
  animation: scan 2.4s ease-in-out infinite;
}

@keyframes scan {
  0% { transform: translateX(-100%); }
  50%, 100% { transform: translateX(100%); }
}

.section {
  display: grid;
  grid-template-columns: 80px minmax(240px, 0.72fr) minmax(0, 1fr);
  gap: clamp(28px, 5vw, 80px);
  width: min(calc(100% - 64px), var(--max-width));
  margin: 0 auto;
  padding: 130px 0;
  border-top: 1px solid var(--line);
}

.section-index {
  color: var(--muted);
  font-family: var(--serif);
  font-size: 18px;
}

.section-heading .eyebrow {
  margin-bottom: 20px;
}

.section-heading h2,
.contact h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(38px, 4.4vw, 62px);
  font-weight: 400;
  line-height: 1.1;
}

.section-body > p {
  max-width: 630px;
  margin: 0;
  font-size: 19px;
  line-height: 1.8;
}

.quick-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin: 64px 0 0;
}

.quick-facts div {
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.quick-facts dt {
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 12px;
}

.quick-facts dd {
  margin: 0;
  font-family: var(--serif);
  font-size: 23px;
}

.research-list,
.publication-list,
.timeline {
  grid-column: 3;
}

.research-item {
  display: grid;
  grid-template-columns: 44px 1fr auto;
  gap: 20px;
  min-height: 132px;
  padding: 26px 0;
  border-top: 1px solid var(--line);
}

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

.item-number {
  color: var(--muted);
  font-size: 11px;
}

.research-item h3,
.timeline-item h3 {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 400;
}

.research-item p,
.timeline-item p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.item-arrow {
  color: var(--accent);
  font-size: 20px;
}

.placeholder-item {
  opacity: 0.55;
}

.publication-item {
  display: grid;
  grid-template-columns: 86px minmax(0, 1fr);
  gap: 28px;
  padding: 30px 0 34px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.publication-meta {
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: var(--muted);
  font-size: 12px;
}

.publication-number {
  color: var(--accent-dark);
  font-weight: 600;
}

.publication-content h3 {
  max-width: 720px;
  margin: 0;
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 400;
  line-height: 1.25;
}

.citation {
  max-width: 760px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}

.citation strong {
  color: var(--ink);
  font-weight: 600;
}

.publication-links {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-top: 24px;
}

.publication-links .text-link {
  font-size: 12px;
}

.venue {
  padding-left: 18px;
  border-left: 1px solid var(--line);
  color: var(--muted);
  font-size: 11px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 32px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
}

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

.timeline-year {
  color: var(--accent-dark);
  font-size: 13px;
  font-weight: 600;
}

.contact {
  background: var(--ink);
  color: #f5f6f3;
}

.contact-inner {
  position: relative;
  width: min(calc(100% - 64px), var(--max-width));
  margin: 0 auto;
  padding: 130px 0;
}

.contact .eyebrow {
  color: #72c8bd;
}

.contact h2 {
  max-width: 820px;
}

.contact-email {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-top: 38px;
  padding-bottom: 6px;
  border-bottom: 1px solid #65706c;
  color: #d9e1de;
  font-size: 16px;
  transition: border-color 160ms ease, color 160ms ease;
}

.contact-email:hover {
  border-color: #72c8bd;
  color: #fff;
}

.back-top {
  position: absolute;
  right: 0;
  bottom: 130px;
  display: flex;
  gap: 12px;
  padding-bottom: 5px;
  border-bottom: 1px solid #65706c;
  font-size: 13px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  padding: 24px max(32px, calc((100vw - var(--max-width)) / 2));
  background: var(--ink);
  border-top: 1px solid #34403c;
  color: #8f9a96;
  font-size: 11px;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 900px) {
  .nav-wrap {
    grid-template-columns: 1fr auto;
  }

  .desktop-nav {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .mobile-nav {
    position: fixed;
    inset: 78px 0 auto;
    flex-direction: column;
    gap: 0;
    padding: 16px 32px 24px;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
  }

  .mobile-nav.open {
    display: flex;
  }

  .mobile-nav a {
    padding: 15px 0;
    border-bottom: 1px solid var(--line);
  }

  .hero {
    grid-template-columns: 1fr 0.72fr;
    column-gap: 40px;
  }

  .hero h1 {
    font-size: clamp(64px, 11vw, 96px);
  }

  .hero-intro {
    font-size: 29px;
  }

  .section {
    grid-template-columns: 48px 0.72fr 1fr;
    gap: 24px;
  }
}

@media (max-width: 680px) {
  .nav-wrap,
  .hero,
  .section,
  .contact-inner {
    width: min(calc(100% - 40px), var(--max-width));
  }

  .nav-wrap {
    height: 68px;
  }

  .mobile-nav {
    inset: 68px 0 auto;
    padding-inline: 20px;
  }

  .wordmark > span:last-child {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding: 58px 0 86px;
  }

  .hero-copy {
    display: contents;
  }

  .hero .eyebrow {
    order: 1;
  }

  .hero h1 {
    order: 2;
    font-size: clamp(68px, 24vw, 104px);
  }

  .portrait-wrap {
    order: 3;
    width: min(82%, 390px);
    margin: 44px 0 0 auto;
  }

  .hero-intro {
    order: 4;
    margin-top: 40px;
    font-size: 29px;
  }

  .hero-links {
    order: 5;
    margin-top: 32px;
  }

  .scroll-cue {
    display: none;
  }

  .section {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 88px 0;
  }

  .section-index {
    margin-bottom: 36px;
  }

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

  .section-heading h2,
  .contact h2 {
    font-size: 42px;
  }

  .section-body > p {
    font-size: 17px;
  }

  .research-list,
  .publication-list,
  .timeline {
    grid-column: 1;
  }

  .research-item {
    grid-template-columns: 34px 1fr auto;
  }

  .research-item h3,
  .timeline-item h3 {
    font-size: 24px;
  }

  .timeline-item {
    grid-template-columns: 90px 1fr;
    gap: 18px;
  }

  .publication-item {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .publication-meta {
    flex-direction: row;
    justify-content: space-between;
  }

  .publication-content h3 {
    font-size: 26px;
  }

  .contact-inner {
    padding: 90px 0 150px;
  }

  .back-top {
    right: auto;
    bottom: 76px;
    left: 0;
  }

  .site-footer {
    padding-inline: 20px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}