/* ────────────────────────────────────────────────────────────────
   Base styles. Everything visual lives in this one file.
   Colors and spacing are defined once below as variables — change
   a value here and it updates everywhere it's used.
   ──────────────────────────────────────────────────────────────── */

:root {
  --color-text: #222222;
  --color-text-muted: #666666;
  --color-bg: #ffffff;
  --color-accent: #1a4d8f;
  --color-border: #e5e5e5;

  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;

  --content-width: 760px;
  --spacing: 1.5rem;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.3;
}

.wrap {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

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

a:hover {
  text-decoration: underline;
}

h1, h2, h3 {
  line-height: 1.25;
  font-weight: 600;
}

/* ── Header / nav ─────────────────────────────────────────────── */

.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: 1.25rem 0;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.site-title {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
}

.site-nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
}

.site-nav a {
  color: var(--color-text-muted);
}

.site-nav a.active,
.site-nav a:hover {
  color: var(--color-text);
}

/* ── Main content ─────────────────────────────────────────────── */

.page-content {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 3rem 1.25rem;
  min-height: 60vh;
}

/* ── Footer ───────────────────────────────────────────────────── */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 1.5rem 0;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* ── Home page hero ───────────────────────────────────────────── */

.hero {
  position: relative;
  overflow: hidden;
  text-align: center;
  padding: 4rem 0 3.5rem;
  aspect-ratio: 12 / 12;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.profile-photo {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 1rem;
}

.hero h1 {
  margin: 0.25rem 0 0;
  font-size: 2rem;
}

.tagline {
  color: var(--color-text-muted);
  margin: 0.4rem 0 0;
}

.bio {
  max-width: 560px;
  margin: 1.75rem auto 0;
  text-align: left;
}

.social-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  padding: 0;
  margin: 1.75rem 0 0;
}

.social-links a {
  display: inline-block;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 0.4rem 1rem;
  font-size: 0.9rem;
  color: var(--color-text);
}

.social-links a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  text-decoration: none;
}

/* ── Research page: project cards ────────────────────────────── */

.project-list {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.project-card {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 3rem;
}

.project-card:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.project-image {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  margin: 0 auto 1.25rem;
}

.project-title {
  margin: 0 0 0.5rem;
  font-size: 1.4rem;
}

.project-description {
  margin-bottom: 0.75rem;
}

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

.project-publications {
  list-style: none;
  padding: 0;
  margin: 0.75rem 0 0;
  font-size: 0.9rem;
  font-weight: 600;
}

.project-publications li + li {
  margin-top: 0.35rem;
}

.project-video {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  margin-top: 1.25rem;
  border-radius: 4px;
  overflow: hidden;
  background: #000;
}

.project-video iframe,
.project-video video {
  width: 100%;
  height: 100%;
  display: block;
  border: 0;
}

/* ── Publications page ────────────────────────────────────────── */

.section-heading {
  font-size: 1.2rem;
  margin: 0 0 1.25rem;
}

.section-heading + .publication-list {
  margin-bottom: 3rem;
}

.publication-list {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.publication-entry {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 1.75rem;
}

.publication-entry:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.publication-title {
  margin: 0 0 0.35rem;
  font-weight: 600;
}

.publication-meta {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.publication-links {
  margin: 0.5rem 0 0;
  font-size: 0.9rem;
}

/* ── Contact page ─────────────────────────────────────────────── */

.contact-info p {
  margin: 0 0 1rem;
}

.contact-affiliations {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: 1rem;
}

.contact-institution {
  margin: 0 0 0.25rem;
}

.contact-address {
  line-height: 1.5;
}

.contact-affiliation .contact-address {
  margin-bottom: 0;
}

.contact-links {
  justify-content: flex-start;
  margin-top: 0.5rem;
}

/* ── Mobile ───────────────────────────────────────────────────── */

@media (max-width: 600px) {
  .site-header .wrap {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-nav ul {
    gap: 1rem;
    flex-wrap: wrap;
  }

  /* The hero's fixed square aspect-ratio doesn't leave enough room
     for its content on narrow screens (it would get clipped by
     overflow: hidden), so let it size to its content here instead. */
  .hero {
    aspect-ratio: unset;
  }
}