:root {
  color-scheme: dark;
  --background: #101613;
  --text: #e7eee8;
  --secondary: #aab9af;
  --accent: #7fd4a5;
  --border: #3b4c42;
  --selection-background: #244c37;
  --selection-text: #e7eee8;
  --content-width: 72rem;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--background);
  font-synthesis: none;
}

:root[data-theme="light"] {
  color-scheme: light;
  --background: #f7f7f2;
  --text: #171b1a;
  --secondary: #4e5853;
  --accent: #176b48;
  --border: #d6ddd5;
  --selection-background: #d5e8da;
  --selection-text: #171b1a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-size: 1.0625rem;
  line-height: 1.65;
}

a {
  color: var(--accent);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.25em;
}

a:hover {
  text-decoration-thickness: 0.15em;
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 6px;
}

::selection {
  background: var(--selection-background);
  color: var(--selection-text);
}

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

h1, h2, h3 {
  line-height: 1.15;
  font-weight: 600;
}

h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  letter-spacing: -0.045em;
}

h3 {
  font-size: 1.375rem;
  letter-spacing: -0.025em;
}

.page-shell {
  width: min(calc(100% - 3rem), var(--content-width));
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  top: 0.75rem;
  left: 1.5rem;
  z-index: 1;
  padding: 0.6rem 1rem;
  background: var(--background);
  transform: translateY(-200%);
  font-weight: 600;
}

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

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.25rem 2rem;
  padding-block: 1.75rem;
  border-bottom: 1px solid var(--border);
}

.wordmark {
  color: var(--text);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.035em;
  text-decoration: none;
}

.wordmark span {
  font-weight: 400;
}

.wordmark:hover {
  text-decoration: underline;
}

.header-controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem 2rem;
  min-width: 0;
}

.theme-control {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  flex-shrink: 0;
  color: var(--text);
  font-size: 0.875rem;
  cursor: pointer;
}

.theme-control[hidden] {
  display: none;
}

.theme-control input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.theme-track {
  display: block;
  width: 52px;
  height: 28px;
  padding: 2px;
  border: 2px solid var(--accent);
  border-radius: 999px;
  background: var(--accent);
  pointer-events: none;
}

.theme-thumb {
  display: block;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--background);
  transition: transform 150ms ease;
}

.theme-control input:checked + .theme-track .theme-thumb {
  transform: translateX(24px);
}

.theme-control input:focus-visible + .theme-track {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

@media (prefers-reduced-motion: reduce) {
  .theme-thumb {
    transition: none;
  }
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.75rem;
  font-size: 0.9375rem;
}

.site-nav a {
  display: inline-block;
  padding-block: 0.25rem;
  color: var(--text);
}

.hero {
  padding-block: clamp(3.25rem, 7.25vw, 6rem);
}

.eyebrow {
  color: var(--accent);
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-size: 0.8125rem;
  line-height: 1.5;
  letter-spacing: 0.025em;
}

.hero .eyebrow {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.lab-mark {
  width: 0.5rem;
  height: 0.5rem;
  flex-shrink: 0;
  background: var(--accent);
}

.hero h1 {
  font-size: clamp(2.75rem, 7.5vw, 6.5rem);
  letter-spacing: -0.065em;
  line-height: 1.05;
}

.hero h1 span {
  font-weight: 400;
}

.hero-positioning {
  margin-top: 1.75rem;
  font-size: clamp(1.125rem, 2.5vw, 1.625rem);
  line-height: 1.4;
  letter-spacing: -0.025em;
}

.hero-introduction {
  max-width: 55ch;
  margin-top: 1rem;
  color: var(--secondary);
}

.research-link {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 2rem;
  padding-block: 0.375rem;
  font-weight: 600;
}

.section {
  border-top: 1px solid var(--border);
  padding-block: clamp(3rem, 6vw, 5rem);
  scroll-margin-top: 1.5rem;
}

.section-split {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 2rem 4rem;
}

.section-heading .eyebrow {
  margin-bottom: 1rem;
}

.section-copy {
  max-width: 65ch;
  color: var(--secondary);
}

.section-copy p + p {
  margin-top: 1rem;
}

.research-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
}

.section-introduction {
  max-width: 34ch;
  color: var(--secondary);
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2rem;
  margin-top: 2.75rem;
}

.research-item {
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
}

.research-number {
  margin-bottom: 1rem;
  color: var(--accent);
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-size: 0.8125rem;
}

.research-item h3 {
  max-width: 22ch;
  margin-bottom: 1rem;
}

.research-item {
  display: flex;
  flex-direction: column;
  align-items: start;
}

.project-description {
  color: var(--secondary);
  margin-bottom: 1.5rem;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: auto;
  padding-block: 0.375rem;
  font-size: 0.9375rem;
  font-weight: 600;
}

.footer-brand span {
  color: var(--secondary);
  font-weight: 400;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  padding-block: 0.375rem;
}

.approach-copy {
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  line-height: 1.6;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem 2rem;
  border-top: 1px solid var(--border);
  padding-block: 1.75rem 2.5rem;
  color: var(--secondary);
  font-size: 0.875rem;
}

.footer-brand {
  color: var(--text);
  font-weight: 600;
}

@media (max-width: 48rem) {
  .section {
    padding-block: 2.5rem;
  }

  .section-split {
    grid-template-columns: 1fr;
    row-gap: 1.25rem;
  }

  .research-heading {
    flex-direction: column;
    align-items: start;
    gap: 1.25rem;
  }

  .section-introduction {
    max-width: 55ch;
  }

  .research-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
    margin-top: 2rem;
  }

  .project-description {
    max-width: 65ch;
  }
}

@media (max-width: 30rem) {
  .page-shell {
    width: calc(100% - 2.5rem);
  }

  .site-header {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding-block: 0.75rem;
    gap: 0.25rem 0.75rem;
  }

  .header-controls {
    display: contents;
  }

  .theme-control {
    grid-column: 2;
    grid-row: 1;
  }

  .theme-control > span:first-child {
    display: none;
  }

  .site-nav {
    grid-column: 1 / -1;
    grid-row: 2;
    gap: 0.5rem 1.5rem;
  }

  .site-nav a {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
  }

  .research-link {
    margin-top: 1.5rem;
  }

  .site-footer {
    padding-block: 1.25rem 1.75rem;
  }

  .hero h1 span {
    display: block;
  }
}