:root {
  --accent: #1f6feb;
  --text: #1f2328;
  --muted: #57606a;
  --border: #e5e7eb;
  --bg-soft: #f6f8fa;
  --max: 820px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  line-height: 1.6;
  background: #fff;
}

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

/* ── Top nav ─────────────────────────────────────────────── */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.7rem 1.2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.nav-brand { font-weight: 700; color: var(--text); }
.nav-links a { margin-left: 1.1rem; color: var(--muted); font-size: 0.95rem; }
.nav-links a:hover { color: var(--accent); text-decoration: none; }

/* ── Layout ──────────────────────────────────────────────── */
.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2rem 1.2rem 3rem;
}
section { margin-bottom: 2.75rem; scroll-margin-top: 4rem; }
h2 {
  font-size: 1.5rem;
  border-bottom: 2px solid var(--border);
  padding-bottom: 0.35rem;
  margin-bottom: 1.1rem;
}

/* ── Profile header ──────────────────────────────────────── */
.profile {
  display: flex;
  gap: 1.6rem;
  align-items: center;
  margin-top: 0.5rem;
}
.profile-photo {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border);
  flex-shrink: 0;
}
.profile-info h1 { margin: 0 0 0.2rem; font-size: 1.9rem; }
.profile-info .role { margin: 0; font-weight: 600; }
.profile-info .affiliation { margin: 0.15rem 0 0.2rem; color: var(--muted); }
.profile-info .lab-line { margin: 0 0 0.7rem; color: var(--muted); font-size: 0.95rem; }
.profile-info .links a {
  display: inline-block;
  margin: 0 0.9rem 0.3rem 0;
  font-size: 0.92rem;
}
.bio { color: #333; }

/* ── Research cards ──────────────────────────────────────── */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}
.card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.1rem 1.2rem;
  background: var(--bg-soft);
}
.card h3 { margin: 0 0 0.4rem; font-size: 1.1rem; }
.card p { margin: 0 0 0.7rem; font-size: 0.95rem; color: #333; }
.tags { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tags li {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.15rem 0.7rem;
  font-size: 0.8rem;
  color: var(--muted);
}

/* ── Publications ────────────────────────────────────────── */
.pub-list { padding-left: 1.2rem; }
.pub { margin-bottom: 1rem; }
.pub-title { display: block; font-weight: 600; }
.pub.selected .pub-title::before { content: "★ "; color: var(--accent); }
.pub-authors { display: block; font-size: 0.9rem; color: #333; }
.pub-venue { display: block; font-size: 0.9rem; color: var(--muted); font-style: italic; }
.pub-links a {
  font-size: 0.82rem;
  margin-right: 0.7rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.05rem 0.5rem;
}

/* ── Awards ──────────────────────────────────────────────── */
.award-list { list-style: none; padding: 0; margin: 0; }
.award-list li { display: flex; gap: 1rem; padding: 0.45rem 0; border-bottom: 1px solid var(--border); }
.award-year { flex: 0 0 3.2rem; font-weight: 700; color: var(--accent); }

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

/* ── Mobile ──────────────────────────────────────────────── */
@media (max-width: 560px) {
  .profile { flex-direction: column; text-align: center; }
  .profile-info .links a { margin: 0 0.45rem 0.3rem; }
}