/* Yue (Luna) Xiao — personal academic website */

:root {
  --text: #2a2f35;
  --muted: #5b636d;
  --faint: #8a929b;
  --accent: #115740;        /* William & Mary green */
  --accent-soft: #eef5f1;
  --gold: #b9975b;          /* William & Mary gold */
  --border: #e6e9ec;
  --bg: #ffffff;
  --max-width: 1120px;
  /* W&M brand fonts: Adelle (Adobe) -> approved free alternates Aleo + Roboto */
  --serif: "Aleo", Georgia, serif;
  --sans: "Roboto", Arial, sans-serif;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.7;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 2px; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------- Header / navigation ---------- */

.site-header {
  border-top: 4px solid var(--accent);
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.site-header .container {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 32px;
  padding-top: 20px;
  padding-bottom: 18px;
}

.site-title {
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
}
.site-title:hover { text-decoration: none; }
.site-title .affil {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold);
  margin-left: 10px;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 22px;
}
.site-nav a {
  color: var(--muted);
  font-size: 0.95rem;
  padding-bottom: 3px;
  border-bottom: 2px solid transparent;
}
.site-nav a:hover { color: var(--accent); text-decoration: none; }
.site-nav a.active {
  color: var(--accent);
  font-weight: 500;
  border-bottom-color: var(--accent);
}

/* ---------- Page layout ---------- */

main.container { padding-top: 44px; padding-bottom: 72px; }

.layout {
  display: grid;
  grid-template-columns: 236px 1fr;
  gap: 56px;
}

.sidebar {
  font-size: 0.92rem;
  padding-right: 32px;
  border-right: 1px solid var(--border);
  margin-right: -24px;   /* place the divider between the columns */
}
.content { min-width: 0; }

/* Single-column pages read better at a narrower measure */
.page { max-width: 860px; }

/* ---------- Typography ---------- */

h1, h2 {
  font-family: var(--serif);
  font-weight: 600;
  color: var(--text);
}

h1 { font-size: 1.9rem; margin: 0 0 12px; }

h2 {
  font-size: 1.3rem;
  margin: 52px 0 20px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}
h2 .more { font-family: var(--sans); font-size: 0.9rem; font-weight: 400; margin-left: 6px; }
.content > h2:first-child { margin-top: 0; }

h3 {
  font-size: 1rem;
  font-weight: 500;
  margin: 26px 0 10px;
}

p { margin: 0 0 18px; }

.footnote { color: var(--muted); font-size: 0.88rem; }

/* ---------- Sidebar ---------- */

.profile-photo {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: top;
  border-radius: 4px;
  margin-bottom: 14px;
}

.contact { line-height: 1.55; color: var(--muted); margin-bottom: 14px; }
.contact strong { color: var(--text); font-weight: 500; }

.buttons { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
.btn {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 500;
  padding: 3px 10px;
  border: 1px solid var(--accent);
  border-radius: 3px;
  color: var(--accent);
}
.btn:hover { background: var(--accent); color: #fff; text-decoration: none; }

.sidebar h2 {
  font-size: 1.1rem;
  margin: 36px 0 14px;
  padding-bottom: 4px;
}

.class-list { list-style: none; margin: 0; padding: 0; }
.class-list li { margin-bottom: 6px; }
.class-list .term { color: var(--muted); }

.news-list { list-style: none; margin: 0; padding: 0; }
.news-list li { margin-bottom: 16px; line-height: 1.55; }
.news-list .date {
  display: block;
  font-weight: 500;
  font-size: 0.82rem;
  color: var(--accent);
  letter-spacing: 0.02em;
}

/* ---------- Content blocks ---------- */

.callout {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  padding: 12px 16px;
  margin: 18px 0 0;
}
.callout p:last-child { margin-bottom: 0; }

.bullets { margin: 0; padding-left: 20px; }
.bullets li { margin-bottom: 6px; }

.dated-list { list-style: none; margin: 0; padding: 0; }
.dated-list li {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  margin-bottom: 10px;
}
.dated-list .date {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  text-align: right;
}

/* ---------- Publications ---------- */

.pub-list { list-style: none; margin: 0; padding: 0; }

.pub {
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: 16px;
  margin-bottom: 24px;
  line-height: 1.6;
}

.venue-badge {
  align-self: start;
  text-align: center;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: #fff;
  background: var(--accent);
  border-radius: 3px;
  padding: 3px 4px;
  margin-top: 3px;
}
.venue-badge.workshop { background: #fff; color: var(--accent); border: 1px solid var(--accent); padding: 2px 3px; }

.pub-title { font-weight: 500; color: var(--text); }
a.pub-title:hover { color: var(--accent); }
.pub-authors .me { font-weight: 500; text-decoration: underline; text-underline-offset: 2px; }
.pub-venue { color: var(--muted); }
.cofirst { color: var(--faint); font-size: 0.85rem; white-space: nowrap; }
.pub-links { font-size: 0.85rem; }
.pub-links a {
  display: inline-block;
  margin: 3px 6px 0 0;
  padding: 0 6px;
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--muted);
}
.pub-links a:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.award {
  display: inline-block;
  margin-top: 3px;
  font-size: 0.8rem;
  font-weight: 500;
  color: #7a5c1e;
  background: #f6efe1;
  border: 1px solid #e3d3ad;
  border-radius: 3px;
  padding: 0 7px;
}

/* ---------- People ---------- */

.people-list { margin: 0; padding-left: 20px; }
.people-list li { margin-bottom: 8px; }
.people-list .note { color: var(--muted); }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--faint);
  font-size: 0.82rem;
  padding: 18px 0 30px;
}

/* ---------- Responsive ---------- */

@media (max-width: 820px) {
  /* Stack as: profile card, main content, then classes and news */
  .layout { display: flex; flex-direction: column; gap: 0; }
  .sidebar { display: contents; border-right: 0; }
  .profile-card {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 0 20px;
    align-items: start;
    margin-bottom: 24px;
  }
  .profile-card .profile-photo { grid-row: span 2; margin-bottom: 0; }
  .content { order: 1; }
  .sidebar > section { order: 2; font-size: 0.92rem; }
}

@media (max-width: 560px) {
  .container { padding: 0 18px; }
  main.container { padding-top: 24px; }
  .site-title { font-size: 1.4rem; }
  .site-title .affil { display: none; }
  .site-nav { gap: 4px 16px; }
  .profile-card { grid-template-columns: 120px 1fr; gap: 0 16px; }
  .pub { grid-template-columns: 1fr; gap: 4px; }
  .venue-badge { justify-self: start; padding: 2px 8px; }
  .dated-list li { grid-template-columns: 1fr; gap: 0; }
  .dated-list .date { text-align: left; order: -1; font-size: 0.85rem; }
}