/* ---------- Colour tokens ---------- */
:root {
  --bg: #fbfbf9;
  --surface: #ffffff;
  --surface-2: #f2f5f4;
  --text: #1c2321;
  --muted: #5b6663;
  --border: #e3e8e6;
  --accent: #0f766e;
  --accent-strong: #0b5c56;
  --accent-soft: #e3f3f1;
  --on-accent: #ffffff;
  --shadow: 0 1px 2px rgba(16, 24, 22, .05), 0 8px 24px rgba(16, 24, 22, .06);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111615;
    --surface: #171d1c;
    --surface-2: #1d2524;
    --text: #e6ebea;
    --muted: #9aa7a4;
    --border: #2a3432;
    --accent: #5eead4;
    --accent-strong: #99f6e4;
    --accent-soft: #15302d;
    --on-accent: #0b1f1d;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #111615;
  --surface: #171d1c;
  --surface-2: #1d2524;
  --text: #e6ebea;
  --muted: #9aa7a4;
  --border: #2a3432;
  --accent: #5eead4;
  --accent-strong: #99f6e4;
  --accent-soft: #15302d;
  --on-accent: #0b1f1d;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
  color-scheme: dark;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 Inter, system-ui, -apple-system, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-strong); text-decoration: underline; text-underline-offset: 2px; }
img { max-width: 100%; height: auto; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 32px; } }
.muted { color: var(--muted); }
.small { font-size: .875rem; }

/* ---------- Top menu ---------- */
.nav {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(160%) blur(10px);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; gap: 16px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; color: var(--text); white-space: nowrap; }
.brand:hover { color: var(--text); text-decoration: none; }
.mark {
  display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 8px;
  background: var(--accent); color: var(--on-accent); font: 700 13px/1 "Source Serif 4", Georgia, serif;
}
.nav-links { display: flex; gap: 2px; margin-left: auto; }
.nav-links a {
  padding: 6px 10px; border-radius: 8px; color: var(--muted); font-size: .92rem; font-weight: 500; white-space: nowrap;
}
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--text); background: var(--surface-2); text-decoration: none; }
.nav-actions { display: flex; gap: 4px; }
.icon-btn {
  display: inline-grid; place-items: center; width: 36px; height: 36px; padding: 0;
  border: 1px solid transparent; border-radius: 8px; background: none; color: var(--muted); cursor: pointer;
}
.icon-btn:hover { background: var(--surface-2); color: var(--text); }
.icon-btn svg { width: 19px; height: 19px; }
.i-moon { display: none; }
:root[data-theme="dark"] .i-sun { display: none; }
:root[data-theme="dark"] .i-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .i-sun { display: none; }
  :root:not([data-theme="light"]) .i-moon { display: block; }
}
.nav-burger { display: none; }
@media (max-width: 900px) {
  .nav-burger { display: inline-grid; }
  .nav-actions { margin-left: auto; }
  .nav-links {
    display: none; position: absolute; top: 60px; left: 0; right: 0; margin: 0;
    flex-direction: column; padding: 8px 16px 16px; background: var(--bg); border-bottom: 1px solid var(--border);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 10px 12px; }
}

/* ---------- Home page header ---------- */
.hero { border-bottom: 1px solid var(--border); background: linear-gradient(180deg, var(--accent-soft), var(--bg) 85%); }
.hero-grid { display: grid; grid-template-columns: 1fr auto; gap: 48px; align-items: center; padding-top: 56px; padding-bottom: 56px; }
.hero h1 {
  margin: 0 0 6px; font: 700 clamp(2rem, 5vw, 2.8rem)/1.15 "Source Serif 4", Georgia, serif; letter-spacing: -.01em;
}
.hero .native { font-weight: 600; color: var(--muted); font-size: .7em; margin-left: 4px; }
.role { margin: 0 0 8px; font-size: 1.1rem; font-weight: 600; }
.affils { list-style: none; margin: 0 0 16px; padding: 0; font-size: .95rem; }
.affils li { margin: 2px 0; }
.affils a { color: var(--muted); }
.affils a:hover { color: var(--accent); }
.intro { margin: 0 0 22px; max-width: 58ch; font-size: 1.05rem; }
.cta-row { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 20px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 10px 18px; border-radius: 10px;
  font-weight: 600; font-size: .95rem; border: 1px solid transparent;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover { background: var(--accent-strong); color: var(--on-accent); }
.btn-ghost { border-color: var(--border); background: var(--surface); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.socials { display: flex; gap: 8px; }
.socials a {
  display: inline-grid; place-items: center; width: 38px; height: 38px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--surface); color: var(--muted);
}
.socials a:hover { color: var(--accent); border-color: var(--accent); }
.socials svg { width: 18px; height: 18px; }
.hero-photo img {
  display: block; width: 240px; height: 240px; object-fit: cover; object-position: center 20%;
  border-radius: 50%; border: 4px solid var(--surface); box-shadow: var(--shadow);
}
@media (max-width: 720px) {
  .hero-grid { grid-template-columns: 1fr; gap: 24px; padding-top: 32px; padding-bottom: 36px; }
  .hero-photo { order: -1; }
  .hero-photo img { width: 140px; height: 140px; }
}

/* ---------- Content (Markdown) ---------- */
.content { max-width: 1040px; padding-top: 12px; padding-bottom: 56px; }
.content > * { max-width: 820px; }
.content.page { padding-top: 40px; }
.content h1 {
  margin: 8px 0 20px; font: 700 clamp(1.8rem, 4vw, 2.3rem)/1.2 "Source Serif 4", Georgia, serif;
}
.content h1:not(:first-child) { margin-top: 48px; padding-top: 32px; border-top: 1px solid var(--border); }
.content h2 {
  margin: 48px 0 16px; padding-top: 32px; border-top: 1px solid var(--border);
  font: 700 1.6rem/1.25 "Source Serif 4", Georgia, serif;
}
.content > h2:first-child { border-top: 0; margin-top: 32px; padding-top: 0; }
.content h2 a { color: inherit; text-decoration: underline; text-decoration-color: var(--accent); text-underline-offset: 4px; }
.content h3 { margin: 32px 0 10px; font-size: 1.12rem; line-height: 1.4; }
.content p { margin: 0 0 14px; }
.content ul, .content ol { margin: 0 0 16px; padding-left: 1.3em; }
.content li { margin: 6px 0; }
.content li::marker { color: var(--accent); }
.content strong { font-weight: 600; }
.content hr { border: 0; border-top: 1px solid var(--border); margin: 32px 0; }
.content blockquote { margin: 0 0 16px; padding: 4px 16px; border-left: 3px solid var(--accent); color: var(--muted); }
.content code { font-size: .9em; background: var(--surface-2); padding: 1px 5px; border-radius: 5px; }

/* Publications & talks read as a list of entries */
#research--publicationspreprint + ul > li,
#talks--presentations + ul > li { margin: 0 0 14px; }

/* Highlighted box, e.g. hiring */
.callout {
  margin: 40px 0 8px; padding: 4px 28px 14px; border-radius: 16px;
  background: var(--surface); border: 1px solid var(--border); border-left: 4px solid var(--accent);
  box-shadow: var(--shadow);
}
.callout h2 { border-top: 0; padding-top: 0; margin-top: 22px; }
.callout + h2 { margin-top: 40px; }
@media (max-width: 720px) { .callout { padding: 2px 18px 10px; } }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--border); background: var(--surface-2); }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: 16px; padding-top: 32px; padding-bottom: 32px; }
.footer h2 { margin: 0 0 8px; font: 700 1.3rem/1.3 "Source Serif 4", Georgia, serif; }
.footer p { margin: 0 0 4px; overflow-wrap: anywhere; }

/* Two columns inside a box (e.g. Required / Preferred) */
.cols { display: grid; grid-template-columns: 1.4fr 1fr; gap: 8px 32px; margin: 4px 0 6px; }
.cols p { margin-bottom: 4px; }
.cols ul { margin-bottom: 8px; }
.cols li { margin: 3px 0; }
@media (max-width: 720px) { .cols { grid-template-columns: 1fr; } }

/* Expandable section */
.content details { margin: 6px 0 12px; border-top: 1px solid var(--border); padding-top: 10px; }
.content summary {
  cursor: pointer; font-weight: 600; color: var(--accent); list-style: none;
  display: inline-flex; align-items: center; gap: 6px;
}
.content summary::-webkit-details-marker { display: none; }
.content summary::before { content: "▸"; transition: transform .15s; }
.content details[open] summary::before { transform: rotate(90deg); }
.content details[open] summary { margin-bottom: 10px; }