/* =========================================================
   TOKENS
   Change colors, fonts, and spacing here. index.html should
   rarely need edits for a purely visual change.
   ========================================================= */
:root {
  --text: #1c1c1a;
  --text-muted: #55534c;
  --background: #fafaf7;
  --surface-alt: #f2f1eb;
  --border: #e1dfd5;
  --accent: #1f3a5f;      /* deep academic blue — change for a different accent */
  --accent-muted: #4a6483;

  --font-display: "Source Serif 4", Georgia, "Times New Roman", serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --content-width: 720px;
  --wide-width: 960px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text);
  background: var(--background);
  line-height: 1.6;
  font-size: 17px;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 500;
  color: var(--text);
  line-height: 1.25;
  margin: 0 0 0.5em;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
a:hover { color: var(--accent-muted); }

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 0.6em 1em;
  z-index: 100;
}
.skip-link:focus { left: 0.5em; top: 0.5em; }

.placeholder {
  color: var(--accent-muted);
  font-style: italic;
}

/* =========================================================
   HEADER / NAV
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(250, 250, 247, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 0.9em 1.5em;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text);
  text-decoration: none;
  font-size: 1.05rem;
}

.site-nav ul {
  list-style: none;
  display: flex;
  gap: 1.6em;
  margin: 0;
  padding: 0;
}

.site-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.92rem;
  letter-spacing: 0.01em;
}
.site-nav a:hover { color: var(--accent); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
}

/* =========================================================
   HERO
   ========================================================= */
.hero {
  padding: 5em 1.5em 4em;
}

.hero-inner {
  max-width: var(--wide-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 2.5em;
}

.hero-photo {
  width: 176px;
  height: 176px;
  border-radius: 4px;
  object-fit: cover;
  border: 1px solid var(--border);
  flex-shrink: 0;
  background: var(--surface-alt);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  color: var(--accent-muted);
  margin: 0 0 0.6em;
  font-weight: 600;
}

.hero-text h1 {
  font-size: clamp(2.1rem, 4vw, 2.9rem);
}

.hero-intro {
  max-width: 56ch;
  color: var(--text-muted);
  font-size: 1.05rem;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4em 1.4em;
  margin-top: 1.2em;
}

.hero-links a {
  text-decoration: none;
  font-size: 0.92rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 2px;
}
.hero-links a:hover { border-color: var(--accent); }

/* =========================================================
   SECTIONS
   ========================================================= */
.section {
  padding: 4em 1.5em;
  border-top: 1px solid var(--border);
}
.section.alt { background: var(--surface-alt); }

.section-inner {
  max-width: var(--wide-width);
  margin: 0 auto;
}

.section h2 {
  font-size: 1.5rem;
  display: flex;
  align-items: baseline;
  gap: 0.6em;
}

.section-number {
  font-family: var(--font-body);
  font-size: 0.8rem;
  color: var(--accent-muted);
  letter-spacing: 0.05em;
}

.section-lede {
  max-width: 68ch;
  color: var(--text-muted);
  margin-top: -0.2em;
  margin-bottom: 1.8em;
}

.prose {
  max-width: var(--content-width);
}
.prose p { margin: 0 0 1.1em; }

/* =========================================================
   RESEARCH
   ========================================================= */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 2em 2.5em;
}

.research-item h3 {
  font-size: 1.05rem;
  margin-bottom: 0.4em;
}

.research-item p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin: 0;
}

/* =========================================================
   PUBLICATIONS
   ========================================================= */
.pub-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: var(--content-width);
  counter-reset: pub;
}

.publication {
  padding: 1.3em 0;
  border-top: 1px solid var(--border);
}
.publication:last-child { border-bottom: 1px solid var(--border); }

.pub-title {
  margin: 0 0 0.3em;
  font-weight: 500;
}

.pub-meta {
  margin: 0 0 0.5em;
  color: var(--text-muted);
  font-size: 0.93rem;
}

.pub-links {
  margin: 0;
  display: flex;
  gap: 1.2em;
  font-size: 0.88rem;
}

/* =========================================================
   THESIS
   ========================================================= */
.thesis-card {
  max-width: var(--content-width);
  background: var(--background);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  padding: 1.8em 2em;
}

.thesis-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin: 0 0 0.4em;
}

.thesis-meta {
  color: var(--text-muted);
  font-size: 0.93rem;
  margin: 0 0 1em;
}

.thesis-abstract {
  font-size: 0.96rem;
  margin: 0 0 1.4em;
}

.thesis-download {
  display: inline-block;
  font-size: 0.92rem;
  text-decoration: none;
  border-bottom: 1px solid var(--accent);
  padding-bottom: 2px;
}

/* =========================================================
   TIMELINE
   ========================================================= */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: var(--content-width);
}

.timeline li {
  display: flex;
  gap: 1.5em;
  padding: 0.9em 0;
  border-top: 1px solid var(--border);
}
.timeline li:last-child { border-bottom: 1px solid var(--border); }

.timeline-date {
  flex: 0 0 130px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.timeline-body { font-size: 0.97rem; }

/* =========================================================
   TEACHING
   ========================================================= */
.teaching-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: var(--content-width);
}

.teaching-list li {
  padding: 0.9em 0;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.2em;
}
.teaching-list li:last-child { border-bottom: 1px solid var(--border); }

.teaching-meta {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* =========================================================
   DOCUMENTS
   ========================================================= */
.doc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: var(--content-width);
  display: grid;
  gap: 0.6em;
}

.doc-list a {
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  display: inline-block;
  padding-bottom: 2px;
}
.doc-list a:hover { border-color: var(--accent); }

/* =========================================================
   CONTACT
   ========================================================= */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 2em;
  max-width: var(--wide-width);
}

.contact-label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  color: var(--accent-muted);
  font-weight: 600;
  margin: 0 0 0.4em;
}

.contact-grid p:last-child { margin: 0; }

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer {
  text-align: center;
  padding: 2.5em 1.5em;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width: 760px) {
  .hero-inner {
    flex-direction: column;
    text-align: center;
    gap: 1.5em;
  }
  .hero-links { justify-content: center; }

  .nav-toggle { display: flex; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--background);
    border-bottom: 1px solid var(--border);
    display: none;
  }
  .site-nav.open { display: block; }

  .site-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 0.5em 1.5em 1em;
  }
  .site-nav li { border-top: 1px solid var(--border); }
  .site-nav li:first-child { border-top: none; }
  .site-nav a {
    display: block;
    padding: 0.8em 0;
  }

  .timeline li { flex-direction: column; gap: 0.2em; }
  .timeline-date { flex: none; }
}