:root {
  --bg: #ffffff;
  --bg-alt: #f6f7f9;
  --text: #1c2430;
  --muted: #5d6878;
  --line: #e3e7ec;
  --accent: #1d4e89;
  --accent-soft: #e8f0fa;
  --badge: #b45309;
  --serif: "Source Serif 4", Georgia, serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #12161c;
    --bg-alt: #181d25;
    --text: #e6e9ee;
    --muted: #9aa5b4;
    --line: #2a313c;
    --accent: #7fb0ea;
    --accent-soft: #1d2a3b;
    --badge: #f0a54a;
  }
}
:root[data-theme="dark"] {
  --bg: #12161c;
  --bg-alt: #181d25;
  --text: #e6e9ee;
  --muted: #9aa5b4;
  --line: #2a313c;
  --accent: #7fb0ea;
  --accent-soft: #1d2a3b;
  --badge: #f0a54a;
}
:root { color-scheme: light dark; }
:root[data-theme="light"] { color-scheme: light; }
:root[data-theme="dark"] { color-scheme: dark; }

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 var(--sans); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 960px; margin: 0 auto; padding: 0 20px; }
.muted { color: var(--muted); }

/* Top bar */
.topbar { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.topbar-inner { display: flex; align-items: center; justify-content: space-between; height: 56px; gap: 16px; }
.brand { font-family: var(--serif); font-weight: 600; font-size: 1.15rem; color: var(--text); }
.topbar nav { display: flex; gap: 20px; overflow-x: auto; margin-left: auto; }
.topbar nav a { color: var(--muted); font-size: .92rem; font-weight: 500; white-space: nowrap; }
.topbar nav a:hover { color: var(--accent); text-decoration: none; }
.theme-toggle { flex-shrink: 0; width: 34px; height: 34px; border: 1px solid var(--line); border-radius: 50%; background: transparent; color: var(--muted); cursor: pointer; font-size: .95rem; }
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); }

/* Hero */
.hero { padding: 56px 0 40px; border-bottom: 1px solid var(--line); }
.hero-inner { display: flex; gap: 40px; align-items: center; }
.avatar { width: 190px; height: 190px; border-radius: 50%; object-fit: cover; flex-shrink: 0; box-shadow: 0 4px 18px rgba(0,0,0,.12); }
.hero-side { display: flex; flex-direction: column; align-items: center; gap: 16px; flex-shrink: 0; }
.contact { list-style: none; margin: 0; padding: 0; font-size: .82rem; color: var(--muted); }
.contact li { display: flex; align-items: baseline; gap: 8px; margin: 3px 0; }
.contact i { width: 14px; text-align: center; flex-shrink: 0; }
.contact a { color: var(--muted); }
.contact a:hover { color: var(--accent); }
.hero h1 { font-family: var(--serif); font-size: 2.6rem; line-height: 1.1; margin: 0 0 8px; font-weight: 600; }
.role { margin: 0 0 12px; color: var(--muted); font-size: 1.05rem; }
.tagline { margin: 0 0 18px; max-width: 620px; }
.links { display: flex; flex-wrap: wrap; gap: 8px; }
.pill { display: inline-flex; align-items: center; gap: 6px; padding: 6px 14px; border: 1px solid var(--line); border-radius: 999px; font-size: .88rem; font-weight: 500; color: var(--text); }
.pill:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.pill.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.pill.primary:hover { color: #fff; opacity: .9; }

/* Sections */
.section { padding: 52px 0; }
.section.alt { background: var(--bg-alt); }
h2 { font-family: var(--serif); font-size: 1.9rem; font-weight: 600; margin: 0 0 20px; }
h3 { font-size: .8rem; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); margin: 36px 0 4px; font-weight: 600; }

/* Filters */
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 8px; }
.chip { font: 500 .87rem var(--sans); padding: 6px 14px; border-radius: 999px; border: 1px solid var(--line); background: var(--bg); color: var(--text); cursor: pointer; }
.chip:hover { border-color: var(--accent); }
.chip.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.chip .count { opacity: .7; font-size: .8em; }

/* Papers */
.paper { padding: 18px 0; border-bottom: 1px solid var(--line); }
.paper:last-of-type { border-bottom: none; }
.paper-venue { font-size: .85rem; color: var(--muted); display: flex; gap: 8px; align-items: baseline; flex-wrap: wrap; }
.venue { font-style: italic; }
.year { font-weight: 600; }
.year::before { content: "·"; margin-right: 8px; font-weight: 400; }
.paper-venue .year:first-child::before { content: none; }
.badge { font-size: .72rem; font-weight: 600; text-transform: uppercase; letter-spacing: .06em; color: var(--badge); border: 1px solid currentColor; border-radius: 4px; padding: 0 6px; }
.paper-title { font-family: var(--serif); font-size: 1.18rem; font-weight: 600; line-height: 1.35; margin: 4px 0 2px; }
.paper-title a { color: var(--text); }
.paper-title a:hover { color: var(--accent); }
.paper-authors { margin: 0 0 10px; color: var(--muted); font-size: .93rem; }
.paper-actions { display: flex; flex-wrap: wrap; gap: 6px; }
.btn { display: inline-flex; align-items: center; gap: 6px; font: 500 .8rem var(--sans); padding: 4px 11px; border-radius: 6px; border: 1px solid var(--line); background: var(--bg); color: var(--accent); cursor: pointer; }
.btn:hover { background: var(--accent-soft); border-color: var(--accent); text-decoration: none; }
.btn[aria-expanded="true"] { background: var(--accent-soft); border-color: var(--accent); }
.panel { margin-top: 12px; padding: 14px 16px; background: var(--bg-alt); border-left: 3px solid var(--accent); border-radius: 0 6px 6px 0; font-size: .92rem; position: relative; }
.panel p { margin: 0; }
.bibtex pre { margin: 0; white-space: pre-wrap; word-break: break-word; font: .8rem/1.5 ui-monospace, "SFMono-Regular", Consolas, monospace; padding-right: 70px; }
.copy { position: absolute; top: 10px; right: 10px; font: 500 .75rem var(--sans); padding: 3px 9px; border-radius: 5px; border: 1px solid var(--line); background: var(--bg); color: var(--text); cursor: pointer; }
.copy.done { color: #1a7f37; border-color: #1a7f37; }
.empty { color: var(--muted); font-style: italic; }

/* Grants */
.grants { list-style: none; padding: 0; margin: 0; }
.grants li { display: grid; grid-template-columns: 120px 1fr; gap: 16px; padding: 12px 0; border-bottom: 1px solid var(--line); }
.grants li:last-child { border-bottom: none; }
.g-years { color: var(--muted); font-size: .9rem; font-variant-numeric: tabular-nums; }

/* Teaching */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; }
.card { border: 1px solid var(--line); border-radius: 10px; padding: 18px 20px; background: var(--bg); }
.card h4 { font-family: var(--serif); font-size: 1.12rem; margin: 0 0 6px; }
.card p { margin: 0 0 10px; font-size: .93rem; }
.materials { list-style: none; padding: 0; margin: 8px 0 0; }
.materials li { padding: 8px 0; display: flex; gap: 12px; align-items: baseline; border-bottom: 1px solid var(--line); }
.kind { font-size: .72rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); width: 52px; flex-shrink: 0; }

/* About */
.prose p, .prose li { max-width: 720px; }
.prose ul { padding-left: 20px; }

.footer { padding: 28px 0; font-size: .85rem; color: var(--muted); border-top: 1px solid var(--line); }

@media (max-width: 680px) {
  .hero-inner { flex-direction: column; text-align: center; gap: 20px; }
  .avatar { width: 150px; height: 150px; }
  .contact li { justify-content: center; }
  .hero h1 { font-size: 2rem; }
  .links { justify-content: center; }
  .topbar nav { gap: 14px; }
  .brand { display: none; }
  .grants li { grid-template-columns: 1fr; gap: 2px; }
}