:root {
  --background: #f7f8fa;
  --surface: #ffffff;
  --text: #17263b;
  --muted: #526176;
  --accent: #075e70;
  --border: #dce2e9;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.7;
}

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

a:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 5px;
}

.site-header,
main,
footer {
  width: min(1120px, calc(100% - 48px));
  margin-inline: auto;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding-block: 24px;
  border-bottom: 1px solid var(--border);
}

.brand {
  color: var(--text);
  font-size: 1.9rem;
  font-weight: 850;
  letter-spacing: -0.06em;
  text-decoration: none;
}

.brand span {
  color: var(--accent);
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
}

nav a {
  color: var(--text);
  font-size: 0.95rem;
  text-decoration: none;
}

nav a:hover {
  text-decoration: underline;
}

.hero {
  padding-block: 88px 64px;
}

.eyebrow {
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 750;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

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

h1 {
  margin-block: 22px;
  font-size: clamp(2.5rem, 6vw, 4.8rem);
  letter-spacing: -0.055em;
}

h1 span {
  color: var(--accent);
}

h2 {
  max-width: 760px;
  margin-block: 16px 24px;
  font-size: clamp(1.9rem, 3.5vw, 2.7rem);
  letter-spacing: -0.035em;
}

h3 {
  font-size: 1.3rem;
}

.intro,
.section-intro {
  max-width: 720px;
  color: var(--muted);
  font-size: 1.1rem;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 24px;
  margin-top: 18px;
  padding: 12px 22px;
  border-radius: 6px;
  background: var(--text);
  color: white;
  font-weight: 650;
  text-decoration: none;
}

.button:hover {
  background: var(--accent);
}

.credentials {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  margin-top: 36px;
  padding: 0;
  color: var(--muted);
  font-size: 0.85rem;
  list-style: none;
}

.section {
  padding-block: 60px;
  border-top: 1px solid var(--border);
  scroll-margin-top: 24px;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  margin-top: 32px;
}

.card {
  padding: 30px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
}

.featured {
  grid-column: 1 / -1;
  border-top: 4px solid var(--accent);
}

.card p,
.approach-grid p,
.about p {
  color: var(--muted);
}

.card .status {
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 700;
}

.tags,
.publication-note {
  font-size: 0.85rem;
}

.evidence {
  padding-top: 18px;
  border-top: 1px solid var(--border);
}

.approach-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 32px;
}

.about {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

footer {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 24px;
  padding-block: 24px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
}

.skip-link {
  position: absolute;
  top: 8px;
  left: 12px;
  padding: 8px 16px;
  transform: translateY(-200%);
  background: white;
}

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

@media (max-width: 700px) {
  .site-header,
  main,
  footer {
    width: calc(100% - 32px);
  }

  nav {
    gap: 16px;
  }

  .hero {
    padding-block: 52px 40px;
  }

  .project-grid,
  .approach-grid,
  .about {
    grid-template-columns: 1fr;
  }

  .about {
    gap: 12px;
  }

  .section {
    padding-block: 40px;
  }

  .card {
    padding: 24px;
  }
}

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

.table-wrapper {
  overflow-x: auto;
  margin-block: 24px;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
}

caption {
  padding-bottom: 12px;
  color: var(--muted);
  text-align: left;
}

th,
td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

th {
  background: var(--text);
  color: white;
}