:root {
    --ink: #201d26;
    --muted: #6a6574;
    --paper: #fbfaf7;
    --card: #ffffff;
    --purple: #4e2a84;
    --purple-soft: #efe9f7;
    --purple-line: #d9cdea;
    --rule: #e8e4dc;
    --mono: "IBM Plex Mono", monospace;
    --serif: "Fraunces", Georgia, serif;
    --sans: "Source Sans 3", -apple-system, sans-serif;
  }
  * { margin: 0; padding: 0; box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; } }
  body {
    font-family: var(--sans);
    background: var(--paper);
    color: var(--ink);
    font-size: 17px;
    line-height: 1.65;
  }
  a { color: var(--purple); text-decoration: none; }
  a:hover { text-decoration: underline; }
  a:focus-visible, summary:focus-visible, button:focus-visible {
    outline: 2px solid var(--purple); outline-offset: 3px; border-radius: 2px;
  }
  .wrap { max-width: 880px; margin: 0 auto; padding: 0 24px; }

  /* ---------- Nav ---------- */
  nav {
    position: sticky; top: 0; z-index: 50;
    background: rgba(251, 250, 247, 0.92);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--rule);
  }
  .nav-inner {
    max-width: 880px; margin: 0 auto; padding: 14px 24px;
    display: flex; align-items: center; justify-content: space-between; gap: 16px;
    flex-wrap: wrap;
  }
  .nav-name { font-family: var(--serif); font-weight: 600; font-size: 1.05rem; color: var(--ink); letter-spacing: 0.01em; }
  .nav-name:hover { text-decoration: none; color: var(--purple); }
  .nav-links { display: flex; gap: 22px; flex-wrap: wrap; }
  .nav-links a {
    font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.06em;
    text-transform: uppercase; color: var(--muted);
  }
  .nav-links a:hover { color: var(--purple); text-decoration: none; }

  /* ---------- Hero ---------- */
  header.hero { padding: 72px 0 56px; border-bottom: 1px solid var(--rule); }
  .hero-grid { display: grid; grid-template-columns: 180px 1fr; gap: 44px; align-items: center; }
  .portrait {
    width: 180px; height: 180px; border-radius: 50%;
    background: linear-gradient(135deg, var(--purple) 0%, #7a52b8 100%);
    display: flex; align-items: center; justify-content: center;
    color: #fff; font-family: var(--serif); font-size: 3.2rem; font-weight: 500;
    box-shadow: 0 0 0 6px var(--paper), 0 0 0 7px var(--purple-line);
    object-fit: cover;
  }
  .eyebrow {
    font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em;
    text-transform: uppercase; color: var(--purple); margin-bottom: 14px;
  }
  h1 { font-family: var(--serif); font-size: 3rem; font-weight: 500; line-height: 1.1; letter-spacing: -0.01em; }
  .hero-title { margin-top: 14px; color: var(--muted); font-size: 1.05rem; line-height: 1.5; }
  .hero-title a { color: var(--muted); border-bottom: 1px solid var(--purple-line); }
  .hero-title a:hover { color: var(--purple); text-decoration: none; }
  .hero-links { margin-top: 22px; display: flex; gap: 10px; flex-wrap: wrap; }
  .pill {
    font-family: var(--mono); font-size: 0.75rem; letter-spacing: 0.04em;
    padding: 7px 15px; border: 1px solid var(--purple-line); border-radius: 999px;
    color: var(--purple); background: var(--card); transition: background 0.15s, color 0.15s;
  }
  .pill:hover { background: var(--purple); color: #fff; text-decoration: none; border-color: var(--purple); }

  /* ---------- Sections ---------- */
  section { padding: 56px 0; border-bottom: 1px solid var(--rule); }
  h2 { font-family: var(--serif); font-size: 1.9rem; font-weight: 500; margin-bottom: 8px; }
  .section-note { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); margin-bottom: 28px; }
  .prose p { margin-bottom: 1em; }
  .prose p:last-child { margin-bottom: 0; }

  .focus-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 26px; }
  .focus-card {
    background: var(--card); border: 1px solid var(--rule); border-radius: 10px;
    padding: 20px 22px; border-top: 3px solid var(--purple);
  }
  .focus-card h3 { font-family: var(--serif); font-size: 1.1rem; font-weight: 600; margin-bottom: 6px; }
  .focus-card p { font-size: 0.95rem; color: var(--muted); }
  .lab-logo {
    display: block; height: 60px; width: auto; max-width: 100%;
    object-fit: contain; object-position: left; margin-bottom: 14px;
  }

  /* ---------- Publications ---------- */
  .pub {
    background: var(--card); border: 1px solid var(--rule); border-radius: 10px;
    margin-bottom: 16px; overflow: hidden; transition: border-color 0.15s;
  }
  .pub[open], .pub:hover { border-color: var(--purple-line); }
  .pub summary {
    list-style: none; cursor: pointer; padding: 20px 24px;
    display: flex; gap: 16px; align-items: baseline;
  }
  .pub summary::-webkit-details-marker { display: none; }
  .pub-toggle {
    font-family: var(--mono); color: var(--purple); font-size: 1rem;
    flex-shrink: 0; transition: transform 0.2s; line-height: 1.4;
  }
  .pub[open] .pub-toggle { transform: rotate(45deg); }
  .pub-title { font-family: var(--serif); font-size: 1.12rem; font-weight: 600; line-height: 1.4; }
  .pub-meta {
    font-family: var(--mono); font-size: 0.74rem; color: var(--muted);
    margin-top: 6px; letter-spacing: 0.02em;
  }
  .pub-meta .venue { color: var(--purple); }
  .pub-body { padding: 0 24px 22px 24px; }
  .pub-abstract {
    font-size: 0.95rem; color: #454050; border-left: 3px solid var(--purple-soft);
    padding-left: 16px; margin-bottom: 16px;
  }
  .pub-links { display: flex; gap: 8px; flex-wrap: wrap; }
  .pub-links a {
    font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.04em;
    padding: 5px 12px; background: var(--purple-soft); border-radius: 6px; color: var(--purple);
  }
  .pub-links a:hover { background: var(--purple); color: #fff; text-decoration: none; }
  .see-all { display: inline-block; margin-top: 12px; font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.04em; }

  /* ---------- Teaching ---------- */
  .course { background: var(--card); border: 1px solid var(--rule); border-radius: 10px; padding: 22px 24px; margin-bottom: 16px; }
  .course-code { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--purple); margin-bottom: 6px; }
  .course h3 { font-family: var(--serif); font-size: 1.15rem; font-weight: 600; margin-bottom: 8px; }
  .course p { font-size: 0.95rem; color: var(--muted); }

  /* ---------- Footer ---------- */
  footer { padding: 40px 0 56px; }
  .footer-inner { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
  footer p { font-size: 0.85rem; color: var(--muted); }
  footer .mono { font-family: var(--mono); font-size: 0.75rem; }

  @media (max-width: 680px) {
    h1 { font-size: 2.2rem; }
    .hero-grid { grid-template-columns: 1fr; gap: 28px; justify-items: start; }
    .portrait { width: 140px; height: 140px; font-size: 2.5rem; }
    .focus-cards { grid-template-columns: 1fr; }
    .nav-links { gap: 14px; }
  }
/* ---------- Research archive page ---------- */
.page-head { padding: 64px 0 12px; }
.page-head h1 { font-size: 2.4rem; }
.page-head p { color: var(--muted); margin-top: 10px; max-width: 60ch; }
.pub-cat { margin-top: 44px; }
.pub-cat > h3 {
  font-family: var(--serif); font-size: 1.35rem; font-weight: 600;
  padding-bottom: 10px; border-bottom: 2px solid var(--purple);
  margin-bottom: 4px; display: inline-block;
}
.pub-item { padding: 20px 0; border-bottom: 1px solid var(--rule); }
.pub-item:last-child { border-bottom: none; }
.pub-item .pub-title { display: block; }
.pub-item .pub-meta { display: block; margin-bottom: 10px; }
.nav-links a[aria-current="page"] { color: var(--purple); }

/* ---------- News & talks ---------- */
.news-item {
  display: flex; gap: 16px; align-items: baseline;
  padding: 10px 0; border-bottom: 1px solid var(--rule);
  font-size: 0.97rem;
}
.news-item:last-child { border-bottom: none; }
.news-date {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.05em;
  color: var(--purple); flex-shrink: 0; min-width: 64px;
}
.news-more { margin-top: 4px; }
.news-more > summary {
  cursor: pointer; list-style: none; margin: 14px 0 4px;
  font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.05em;
  color: var(--purple);
}
.news-more > summary::-webkit-details-marker { display: none; }
.news-more > summary::after { content: " ↓"; }
.news-more[open] > summary::after { content: " ↑"; }