:root {
  --crimson: #7f1d1d;
  --crimson-dark: #5c1414;
  --crimson-light: #a83232;
  --bg-page: #f4f3f1;
  --bg-card: #ffffff;
  --text-primary: #1f1b16;
  --text-secondary: #55504a;
  --text-muted: #8a847c;
  --border: #e3ded6;
  --radius: 10px;
  --purple: #4c1d95;
  --purple-bg: #f2eefc;
  --purple-text: #4c1d95;
  --red-bg: #fbeaea;
  --red-text: #8f1d1d;
  --max-width: 980px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-page);
}

a { color: var(--crimson); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.25;
  margin: 0 0 0.6em;
  color: var(--text-primary);
}
h1 { font-size: 1.9rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.2rem; }
h4 { font-size: 1.05rem; }

p { margin: 0 0 1em; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- Header / nav ---------- */

.site-header {
  background: var(--crimson);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 1px 3px rgba(0,0,0,0.15);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  padding-top: 12px;
  padding-bottom: 12px;
  gap: 10px;
}

.site-brand {
  color: #fff;
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.2px;
}
.site-brand:hover { text-decoration: none; opacity: 0.92; }

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  display: inline-block;
  color: #f4dede;
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 0.92rem;
}
.site-nav a:hover {
  color: #fff;
  background: rgba(255,255,255,0.12);
  text-decoration: none;
}
.site-nav a[aria-current="page"] {
  color: #fff;
  background: rgba(255,255,255,0.22);
  font-weight: 600;
}

@media (max-width: 700px) {
  .site-header .container { flex-direction: column; align-items: flex-start; }
  .site-nav { gap: 2px; }
  .site-nav a { padding: 6px 8px; font-size: 0.85rem; }
  .container { padding: 0 14px; }
}

/* ---------- Layout helpers ---------- */

main.container { padding-top: 24px; padding-bottom: 48px; }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 20px;
}

.card + .card { margin-top: 0; }

.section-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 2.2em;
  margin-bottom: 0.8em;
}
.section-title:first-child { margin-top: 0; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.two-col {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 20px;
  align-items: start;
}
@media (max-width: 800px) {
  .two-col { grid-template-columns: 1fr; }
}

/* ---------- Hero / bio ---------- */

.hero {
  display: flex;
  gap: 22px;
  align-items: flex-start;
}
.hero img.avatar {
  width: 140px;
  height: 140px;
  object-fit: cover;
  border-radius: 50%;
  border: 3px solid var(--border);
  flex-shrink: 0;
}
@media (max-width: 560px) {
  .hero { flex-direction: column; align-items: center; text-align: center; }
}

.callout {
  border-left: 4px solid var(--crimson);
  background: var(--red-bg);
  padding: 16px 20px;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin-bottom: 20px;
}
.callout h3 { color: var(--red-text); margin-bottom: 0.4em; }

/* ---------- Tags / pills ---------- */

.tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 20px;
  margin-right: 8px;
  vertical-align: middle;
}
.tag-award { background: #fde0e0; color: #8f1d1d; }
.tag-paper { background: #e2f3e6; color: #1f6b3a; }
.tag-tpc   { background: #e2ecfb; color: #1d4e8f; }
.tag-students { background: #fde0e0; color: #8f1d1d; }
.tag-talk  { background: var(--purple-bg); color: var(--purple-text); }

/* ---------- Lists ---------- */

ul.plain, ol.plain { list-style: none; margin: 0; padding: 0; }

.news-list { list-style: none; margin: 0; padding: 0; }
.news-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.96rem;
}
.news-list li:last-child { border-bottom: none; }
.news-date { color: var(--text-muted); font-size: 0.85rem; margin-right: 4px; }

.recent-pubs-list li {
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.94rem;
}
.recent-pubs-list li:last-child { border-bottom: none; }
.recent-pubs-list .pub-loading { color: var(--text-muted); font-style: italic; }

dl.kv { margin: 0; }
dl.kv dt { float: left; clear: left; width: 40%; color: var(--text-secondary); font-weight: 600; padding: 4px 0; }
dl.kv dd { margin-left: 42%; padding: 4px 0; }
dl.kv::after { content: ""; display: block; clear: both; }

table.simple { width: 100%; border-collapse: collapse; font-size: 0.94rem; }
table.simple td, table.simple th { padding: 6px 8px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
table.simple th { color: var(--text-secondary); font-weight: 600; }

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

.person {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.person img {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 2px solid var(--border);
}
.person h4 { margin-bottom: 2px; }
.person p { margin: 0; font-size: 0.9rem; color: var(--text-secondary); }

/* ---------- Project cards ---------- */

.project-card { text-align: center; }
.project-card img { max-width: 100%; height: auto; border-radius: 6px; border: 1px solid var(--border); margin-bottom: 10px; display: block; }
.project-card .imgs { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.project-card .imgs a { flex: 1 1 260px; max-width: 47%; }
.project-card .imgs img { width: 100%; max-width: 100%; }
@media (max-width: 560px) {
  .project-card .imgs a { max-width: 100%; }
}

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

.venue-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}
.venue-chip {
  font: inherit;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.86rem;
}
.venue-chip:hover { border-color: var(--crimson-light); }
.venue-chip.prestige {
  border-color: var(--purple);
  color: var(--purple-text);
  background: var(--purple-bg);
}
.venue-chip.all {
  border-color: var(--crimson);
  color: var(--crimson);
  font-weight: 600;
}
.venue-chip.active {
  background: var(--crimson);
  border-color: var(--crimson);
  color: #fff;
}

.year-heading {
  margin-top: 1.8em;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--crimson);
  color: var(--crimson-dark);
}
.year-heading:first-of-type { margin-top: 0.4em; }

.pub-entry {
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.94rem;
}
.pub-entry:last-child { border-bottom: none; }
.pub-entry .pub-meta { color: var(--text-muted); font-size: 0.86rem; }

/* Venue badges */
.venue-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  padding: 3px 9px;
  border-radius: 20px;
  margin-right: 6px;
  white-space: nowrap;
  vertical-align: middle;
  background: #eceae5;
  color: #5f5a50;
}
.venue-badge.prestige { color: #fff; }
.venue-badge.v-neurips    { background: #4338ca; }
.venue-badge.v-kdd        { background: #7f1d1d; }
.venue-badge.v-icml       { background: #c2410c; }
.venue-badge.v-icdm       { background: #0f766e; }
.venue-badge.v-sigspatial { background: #15803d; }
.venue-badge.v-aaai       { background: #1d4ed8; }
.venue-badge.v-sdm        { background: #be185d; }
.venue-badge.v-ijcai      { background: #92400e; }
.venue-badge.v-www        { background: #0e7490; }
.venue-badge.v-icde       { background: #6d28d9; }

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

.site-footer {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  padding: 30px 0;
}