/* ---------- Design tokens ---------- */
:root {
  --color-bg: #ffffff;
  --color-text: #1a1a1a;
  --color-muted: #6b7280;
  --color-accent: #2563eb;
  --color-border: #e5e7eb;

  --maxw: 720px;
  --space: 1.25rem;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f1115;
    --color-text: #e6e6e6;
    --color-muted: #9aa0aa;
    --color-accent: #6ea8fe;
    --color-border: #2a2e37;
  }
}

/* ---------- Base ---------- */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ---------- Header / nav ---------- */
.site-header {
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background: var(--color-bg);
}

.nav {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: var(--space);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space);
  flex-wrap: wrap;
}

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

.nav__links {
  list-style: none;
  display: flex;
  gap: var(--space);
  margin: 0;
  padding: 0;
}

/* ---------- Layout ---------- */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--space);
}

.hero {
  padding: 3.5rem 0 2rem;
}

.hero h1 {
  font-size: 2.25rem;
  line-height: 1.15;
  margin: 0 0 0.5rem;
}

.hero__tagline {
  font-size: 1.2rem;
  color: var(--color-muted);
  margin: 0;
}

.section {
  padding: 2rem 0;
  border-top: 1px solid var(--color-border);
}

.section h2 {
  font-size: 1.35rem;
  margin: 0 0 1rem;
}

/* ---------- Projects ---------- */
.projects {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.5rem;
}

.project__title {
  margin: 0 0 0.25rem;
  font-size: 1.1rem;
}

.project__desc {
  margin: 0 0 0.25rem;
}

.project__meta {
  margin: 0;
  font-size: 0.9rem;
  color: var(--color-muted);
}

/* ---------- Publications ---------- */
.pubs {
  margin: 0;
  padding-left: 1.25rem;
  display: grid;
  gap: 1rem;
}

.pub {
  line-height: 1.55;
}

.pub cite {
  font-style: italic;
}

.pub__links {
  white-space: nowrap;
}

.pub__links a {
  font-size: 0.9rem;
  margin-left: 0.15rem;
}

/* ---------- Contact ---------- */
.contact {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space);
  margin: 0;
  padding: 0;
}

/* ---------- Footer ---------- */
.site-footer {
  max-width: var(--maxw);
  margin: 2rem auto 0;
  padding: var(--space);
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 0.9rem;
}