/* ============================================================
   Root variables — edit here to change colours/fonts globally
   ============================================================ */
:root {
  --ink:      #0f172a;
  --paper:    #ffffff;
  --accent:   #1e3a5f;
  --muted:    #64748b;
  --border:   #e2e8f0;
  --bg-tag:   #f1f5f9;
  --max-width: 860px;
}

/* ============================================================
   Reset & base
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'DM Sans', system-ui, -apple-system, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.7;
}

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

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

a:hover {
  text-decoration: underline;
}

/* ============================================================
   Layout
   ============================================================ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

main {
  padding: 4rem 0 6rem;
}

section {
  margin-bottom: 4rem;
}

/* ============================================================
   Navigation
   ============================================================ */
nav {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border);
}

nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-name {
  font-weight: 600;
  font-size: 1rem;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.nav-name:hover {
  text-decoration: none;
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.8rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 500;
}

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

.nav-links a.active {
  color: var(--accent);
}

/* ============================================================
   Section labels and dividers
   ============================================================ */
.section-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.section-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin-bottom: 2rem;
}

/* ============================================================
   Home — bio grid
   ============================================================ */
.bio-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 3rem;
  align-items: start;
}

.bio-photo {
  width: 220px;
  height: 220px;
  object-fit: cover;
  object-position: top;
  border-radius: 4px;
}

.bio-text h1 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  margin-bottom: 0.2rem;
  letter-spacing: -0.02em;
}

.bio-text .title {
  color: var(--muted);
  font-size: 0.975rem;
  margin-bottom: 1.25rem;
}

.bio-text p {
  font-size: 0.975rem;
  margin-bottom: 0.9rem;
}

/* Research interest tags */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.25rem;
  margin-bottom: 1.25rem;
}

.tag {
  background: var(--bg-tag);
  color: var(--muted);
  padding: 0.25rem 0.75rem;
  border-radius: 2rem;
  font-size: 0.78rem;
  font-weight: 500;
}

/* Social / contact links in bio */
.social-links {
  display: flex;
  gap: 1.5rem;
}

.social-link {
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 500;
}

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

/* ============================================================
   Publication list
   ============================================================ */
.pub-list {
  list-style: none;
}

.pub-item {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border);
}

.pub-item:last-child {
  border-bottom: none;
}

.pub-title {
  font-weight: 600;
  font-size: 0.975rem;
  margin-bottom: 0.3rem;
  line-height: 1.4;
}

.pub-title a {
  color: var(--ink);
}

.pub-title a:hover {
  color: var(--accent);
  text-decoration: none;
}

.pub-meta {
  font-size: 0.875rem;
  color: var(--muted);
}

.pub-status {
  display: inline-block;
  margin-top: 0.4rem;
  font-size: 0.775rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
}

.pub-links {
  display: flex;
  gap: 1.25rem;
  margin-top: 0.6rem;
}

.pub-link {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--accent);
  font-weight: 600;
  border: 1px solid var(--border);
  padding: 0.2rem 0.6rem;
  border-radius: 3px;
}

.pub-link:hover {
  background: var(--accent);
  color: white;
  text-decoration: none;
  border-color: var(--accent);
}

/* "All research" arrow link */
.more-link {
  display: inline-block;
  margin-top: 1rem;
  font-size: 0.875rem;
  color: var(--accent);
  font-weight: 500;
}

/* ============================================================
   Teaching
   ============================================================ */
.teaching-block {
  margin-bottom: 2.5rem;
}

.teaching-block h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.teaching-block .period {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 1rem;
}

.course-list {
  list-style: none;
}

.course-list li {
  display: flex;
  gap: 1.25rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.925rem;
}

.course-list li:last-child {
  border-bottom: none;
}

.course-code {
  color: var(--muted);
  font-size: 0.8rem;
  min-width: 70px;
  padding-top: 0.15rem;
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}

.award-list {
  list-style: none;
  margin-top: 0.5rem;
}

.award-list li {
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.925rem;
}

.award-list li:last-child {
  border-bottom: none;
}

/* ============================================================
   Contact page
   ============================================================ */
.contact-block {
  font-size: 0.975rem;
}

.contact-block p {
  margin-bottom: 0.75rem;
}

.contact-block a {
  font-weight: 500;
}

/* ============================================================
   Footer
   ============================================================ */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  text-align: center;
  font-size: 0.8rem;
  color: var(--muted);
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 640px) {
  .container {
    padding: 0 1.25rem;
  }

  main {
    padding: 2.5rem 0 4rem;
  }

  .bio-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .bio-photo {
    width: 110px;
    height: 110px;
  }

  .nav-links {
    gap: 1.25rem;
  }

  .nav-links a {
    font-size: 0.75rem;
  }
}