:root {
  --accent: #1f6feb;
  --accent-dark: #1a56b0;
  --ink: #1f2937;
  --muted: #6b7280;
  --bg: #ffffff;
  --bg-soft: #f6f8fa;
  --border: #e5e7eb;
  --award: #b45309;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
}

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

.container { max-width: 920px; margin: 0 auto; padding: 0 24px; }

/* ---------- Header ---------- */
.site-header {
  background: linear-gradient(135deg, #12315e, var(--accent-dark));
  color: #fff;
  padding: 56px 0 40px;
}

.site-header .container { display: flex; align-items: center; gap: 28px; }

.portrait {
  flex: 0 0 120px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  object-position: top center;
  background: rgba(255, 255, 255, 0.15);
  border: 3px solid rgba(255, 255, 255, 0.5);
}

.site-header h1 { margin: 0 0 4px; font-size: 1.9rem; line-height: 1.2; }
.site-header .role { margin: 0; font-size: 1.05rem; opacity: 0.95; }
.site-header .affil { margin: 0; font-size: 0.95rem; opacity: 0.85; }

.header-links { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 8px; }
.header-links a {
  display: inline-block;
  padding: 6px 12px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 20px;
  color: #fff;
  font-size: 0.85rem;
}
.header-links a:hover { background: rgba(255, 255, 255, 0.15); text-decoration: none; }

/* ---------- Nav ---------- */
.site-nav {
  position: sticky;
  top: 0;
  background: #fff;
  border-bottom: 1px solid var(--border);
  z-index: 10;
}
.site-nav .container { display: flex; flex-wrap: wrap; }
.site-nav a {
  display: inline-block;
  padding: 12px 14px;
  color: var(--accent-dark);
  font-weight: 500;
  font-size: 0.9rem;
}
.site-nav a:hover { background: var(--bg-soft); text-decoration: none; }

/* ---------- Layout ---------- */
main.container { padding: 40px 24px 64px; }
section { margin-bottom: 48px; scroll-margin-top: 56px; }

h2 {
  font-size: 1.4rem;
  margin: 0 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border);
}

h3 { margin: 0 0 10px; font-size: 1.1rem; }

/* ---------- Callout (recruiting) ---------- */
.callout {
  border: 1px solid #bfdbfe;
  background: #eff6ff;
  border-radius: 8px;
  padding: 16px 20px;
  margin-bottom: 16px;
}
.callout strong { color: var(--accent-dark); }
.callout ul { margin: 8px 0 8px 20px; padding: 0; }
.callout p { margin: 0; }

/* ---------- Lists ---------- */
.interest-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.interest-list li {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 6px 14px;
  font-size: 0.9rem;
}

.news-list, .award-list, .service-list { margin: 0; padding: 0 0 0 20px; }
.news-list li, .award-list li, .service-list li { margin-bottom: 10px; }
.news-list li { margin-bottom: 14px; }

/* ---------- Publications ---------- */
.pub-year {
  margin: 28px 0 10px;
  font-size: 1.15rem;
  color: var(--accent-dark);
}

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

.pub-list li {
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
}
.pub-list li:last-child { border-bottom: none; }

.pub-authors { color: var(--muted); }
.pub-title { font-style: italic; }
.pub-venue { color: var(--muted); }

.pub-dblp { margin-top: 20px; font-size: 0.95rem; }

.pub-award {
  display: inline-block;
  margin-left: 8px;
  padding: 1px 8px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--award);
  background: #fef3c7;
  border: 1px solid #fde68a;
  border-radius: 10px;
  white-space: nowrap;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--ink);
  color: #d1d5db;
  padding: 24px 0;
  font-size: 0.9rem;
  text-align: center;
}
.site-footer p { margin: 0; }

@media (max-width: 600px) {
  .site-header .container { flex-direction: column; text-align: center; }
  .site-header h1 { font-size: 1.5rem; }
  .site-nav a { padding: 10px 8px; font-size: 0.82rem; }
}