/* ═══════════════════════════════════════════════
   Xuemei Chen — Academic Site Stylesheet
   ═══════════════════════════════════════════════ */
/*ink color #1c1c1c;

/* ─── Tokens ─────────────────────────────────── */
:root {
  --teal:      #00605a;
  --teal-light:#e6f2f1;
  --teal-mid:  #cce5e3;
  --gold:      #b8860b;
  --uncwblue: rgb(15, 44, 88);
  --ink:       rgb(15, 44, 88); 
  --mid:       #444444;
  --muted:     #6b7280;
  --rule:      #d4dbd9;
  --bg:        #fafbfa;
  --white:     #ffffff;

  --display:   'Playfair Display', serif;
  --body:      'Source Sans 3', sans-serif;
  --mono:      'JetBrains Mono', monospace;

  --max:       1040px;
  --nav-h:     60px;
}

/* ─── Reset ──────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--body);
  background: var(--bg);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

a {
  color: var(--teal);
  text-decoration: none;
  transition: color 0.15s;
}
a:hover { color: var(--gold); text-decoration: underline; }

/* ─── Header / Nav ───────────────────────────── */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: var(--teal);
  display: flex;
  align-items: center;
  box-shadow: 0 2px 12px rgba(0,0,0,0.15);
}

nav {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--white);
  text-decoration: none;
  letter-spacing: 0.01em;
}

.logo:hover { color: var(--teal-mid); text-decoration: none; }

.nav-links {
  display: flex;
  list-style: none;
  gap: 4px;
}

.nav-links a {
  font-family: var(--body);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: rgba(255,255,255,0.82);
  text-decoration: none;
  padding: 6px 14px;
  border-radius: 4px;
  transition: background 0.15s, color 0.15s;
}

.nav-links a:hover {
  background: rgba(255,255,255,0.15);
  color: var(--white);
  text-decoration: none;
}

.nav-links a.active {
  background: rgba(255,255,255,0.22);
  color: var(--white);
}

/* ─── Page wrapper ───────────────────────────── */
.page-wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 56px 32px 80px;
}

/* ─── Section headings ───────────────────────── */
h1 {
  font-family: var(--display);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.2;
}

h2 {
  font-family: var(--display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--teal);
  margin-top: 48px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--teal-mid);
}

h3 {
  font-family: var(--body);
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
  margin-top: 28px;
  margin-bottom: 8px;
}

/* ─── Footer ─────────────────────────────────── */
footer {
  background: var(--ink);
  color: rgba(255,255,255,0.45);
  padding: 24px 32px;
  font-size: 0.8rem;
  line-height: 1.6;
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-links a {
  color: rgba(255,255,255,0.5);
  font-size: 0.8rem;
}

.footer-links a:hover { color: var(--teal-mid); text-decoration: none; }


/* ═══════════════════════════════════════════════
   HOME PAGE
   ═══════════════════════════════════════════════ */
.profile-grid {
  display: grid;
  grid-template-columns: 1fr 2.4fr;
  gap: 48px;
  align-items: start;
  margin-bottom: 48px;
}

.profile-sidebar {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.profile-photo-placeholder {
  width: 100%;
  aspect-ratio: 1;
  max-width: 200px;
  background: var(--teal-light);
  border: 3px solid var(--teal-mid);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--display);
  font-size: 3.5rem;
  color: var(--teal);
  margin-bottom: 20px;
}

.contact-block {
  background: var(--white);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 18px 20px;
  font-size: 0.875rem;
  line-height: 2;
}

.contact-block .title {
  font-weight: 700;
  color: var(--ink);
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.contact-block .dept {
  color: var(--muted);
  font-size: 0.82rem;
  margin-bottom: 12px;
  line-height: 1.5;
}

.contact-block .row {
  display: flex;
  gap: 8px;
  align-items: baseline;
  color: var(--mid);
  font-size: 0.82rem;
}

.contact-block .row .lbl {
  font-weight: 600;
  color: var(--ink);
  min-width: 50px;
}

.ext-links {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.ext-links a {
  font-size: 0.82rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.profile-main h1 { margin-bottom: 6px; }

.profile-main .position {
  font-size: 1rem;
  color: var(--teal);
  font-weight: 600;
  margin-bottom: 20px;
}

.bio {
  font-size: 0.975rem;
  color: var(--mid);
  line-height: 1.75;
  margin-bottom: 28px;
}

/* Highlight cards on home */
.highlight-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 8px;
}

.highlight-card {
  background: var(--white);
  border: 1px solid var(--rule);
  border-left: 4px solid var(--teal);
  border-radius: 4px;
  padding: 16px 18px;
  text-decoration: none;
  color: inherit;
  transition: box-shadow 0.15s, border-left-color 0.15s;
  display: block;
}

.highlight-card:hover {
  box-shadow: 0 4px 16px rgba(0,96,90,0.12);
  border-left-color: var(--gold);
  text-decoration: none;
  color: inherit;
}

.highlight-card .hc-label {
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 4px;
}

.highlight-card .hc-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.4;
}

/* Employment table */
.employment-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.employment-list li {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 0.9rem;
}

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

.employment-list .years {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.78rem;
  padding-top: 2px;
}

.employment-list .role { color: var(--ink); }
.employment-list .inst { color: var(--muted); font-size: 0.85rem; }


/* ═══════════════════════════════════════════════
   RESEARCH PAGE
   ═══════════════════════════════════════════════ */
.grant-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.grant-list li {
  background: var(--teal-light);
  border-left: 4px solid var(--teal);
  padding: 12px 16px;
  border-radius: 0 4px 4px 0;
  font-size: 0.9rem;
  line-height: 1.5;
}

.pub-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0;
  counter-reset: pub-counter 23;
}

.pub-list li {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 0.88rem;
  line-height: 1.6;
  counter-increment: pub-counter -1;
}

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

.pub-num {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--muted);
  padding-top: 3px;
  text-align: right;
}

.pub-body { color: var(--mid); }
.pub-body strong { color: var(--ink); }

.pub-links {
  margin-top: 4px;
  display: inline;
  gap: 10px;
  flex-wrap: wrap;
}

.pub-links a {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  background: var(--teal-light);
  color: var(--teal);
  padding: 2px 8px;
  border-radius: 3px;
  text-decoration: none;
}

.pub-links a:hover { background: var(--teal); color: var(--white); text-decoration: none; }

.conf-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.conf-list li {
  font-size: 0.88rem;
  color: var(--mid);
  padding: 8px 0;
  border-bottom: 1px solid var(--rule);
  line-height: 1.55;
}

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


/* ═══════════════════════════════════════════════
   TEACHING PAGE
   ═══════════════════════════════════════════════ */
.current-teaching {
  background: var(--teal-light);
  border: 1px solid var(--teal-mid);
  border-radius: 6px;
  padding: 20px 24px;
  margin-bottom: 12px;
}

.current-teaching .sem-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 6px;
}

.current-teaching p {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink);
}

.teaching-block { margin-bottom: 32px; }

.teaching-block h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--teal);
  background: var(--teal-light);
  padding: 6px 12px;
  border-radius: 3px;
  margin-top: 24px;
  margin-bottom: 0;
}

.teaching-rows {
  list-style: none;
  border: 1px solid var(--rule);
  border-top: none;
  border-radius: 0 0 4px 4px;
  overflow: hidden;
}

.teaching-rows li {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 16px;
  padding: 9px 14px;
  font-size: 0.875rem;
  border-bottom: 1px solid var(--rule);
  background: var(--white);
  align-items: baseline;
}

.teaching-rows li:last-child { border-bottom: none; }
.teaching-rows li:nth-child(even) { background: var(--bg); }

.teaching-rows .sem {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--muted);
  white-space: nowrap;
}

.teaching-rows .course { color: var(--ink); }


/* ═══════════════════════════════════════════════
   STUDENTS PAGE
   ═══════════════════════════════════════════════ */
.opportunity-box {
  background: var(--white);
  border: 1px solid var(--rule);
  border-left: 5px solid var(--gold);
  border-radius: 0 6px 6px 0;
  padding: 24px 28px;
  margin-bottom: 32px;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--mid);
}

.opportunity-box strong { color: var(--ink); }

.link-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.link-list li {
  padding: 11px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 0.9rem;
  display: flex;
  align-items: baseline;
  gap: 10px;
}

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

.link-list li::before {
  content: '→';
  color: var(--teal);
  font-size: 0.85rem;
  flex-shrink: 0;
}

.ds-badge {
  display: inline-block;
  background: var(--teal);
  color: var(--white);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 3px 9px;
  border-radius: 3px;
  margin-bottom: 16px;
}

.ds-note {
  background: var(--teal-light);
  border-radius: 6px;
  padding: 16px 20px;
  font-size: 0.9rem;
  color: var(--mid);
  margin-bottom: 28px;
}


/* ═══════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════ */
@media (max-width: 720px) {
  nav { padding: 0 16px; }
  .nav-links { gap: 2px; }
  .nav-links a { padding: 5px 9px; font-size: 0.8rem; }
  .logo { font-size: 1rem; }

  .page-wrap { padding: 36px 16px 60px; }

  .profile-grid { grid-template-columns: 1fr; gap: 28px; }
  .profile-photo-placeholder { max-width: 120px; font-size: 2.5rem; }

  .highlight-cards { grid-template-columns: 1fr; }

  .employment-list li { grid-template-columns: 1fr; gap: 2px; }
  .employment-list .years { font-size: 0.72rem; }

  .pub-list li { grid-template-columns: 24px 1fr; }

  .teaching-rows li { grid-template-columns: 80px 1fr; }

  .footer-inner { flex-direction: column; align-items: flex-start; }
}