:root {
  --bg: #fbfbfa;
  --surface: #ffffff;
  --tone: #f2f4f6;
  --text: #172033;
  --muted: #687386;
  --line: #dfe4ea;
  --accent: #145da0;
  --accent-dark: #0c477c;
  --shadow: 0 18px 50px rgba(23, 32, 51, .08);
  --radius: 18px;
  --shell: 1240px;
}
[data-theme="dark"] {
  --bg: #0e131b;
  --surface: #151c27;
  --tone: #111822;
  --text: #eef3f8;
  --muted: #a8b2c1;
  --line: #2a3442;
  --accent: #71b7f2;
  --accent-dark: #9dcefa;
  --shadow: 0 20px 60px rgba(0, 0, 0, .28);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, system-ui, sans-serif;
  line-height: 1.72;
  transition: background .25s ease, color .25s ease;
}
a { color: inherit; }
img { max-width: 100%; }
.shell { width: min(var(--shell), calc(100% - 40px)); margin-inline: auto; }
.content-width { max-width: 1040px; }
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 200; padding: 10px 16px; background: var(--text); color: var(--bg); border-radius: 8px; }
.skip-link:focus { top: 16px; }
.site-header {
  position: sticky; top: 0; z-index: 100;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 75%, transparent);
  background: color-mix(in srgb, var(--bg) 87%, transparent);
  backdrop-filter: blur(16px);
}
.nav { min-height: 70px; display: flex; align-items: center; justify-content: space-between; }
.brand {
  display: grid; place-items: center; width: 40px; height: 40px;
  border-radius: 50%; background: var(--text); color: var(--bg);
  text-decoration: none; font-weight: 700; letter-spacing: -.04em;
}
.nav-links { display: flex; gap: 24px; align-items: center; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: .92rem; font-weight: 600; }
.nav-links a:hover { color: var(--text); }
.nav-toggle { display: none; }
.theme-toggle, .nav-toggle {
  border: 1px solid var(--line); background: var(--surface); color: var(--text);
  border-radius: 999px; padding: 8px 12px; cursor: pointer; font: inherit;
}
.hero {
  display: grid; grid-template-columns: 300px 1fr; gap: 80px;
  padding-block: 96px 110px; align-items: start;
}
.profile { position: sticky; top: 108px; text-align: center; }
.portrait {
  display: block;
  width: 100%;
  max-width: 260px;
  height: auto;
  margin: 0 auto 28px;
  border-radius: 0;
  object-fit: contain;
  box-shadow: none;
}
.profile h1 { font: 600 2rem/1.15 "Source Serif 4", serif; margin: 0; }
.profile-role { color: var(--muted); margin: 16px 0 8px; line-height: 1.55; }
.profile-meta { color: var(--muted); font-size: .92rem; }
.social-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-top: 22px; }
.social-links a {
  text-decoration: none; border: 1px solid var(--line); border-radius: 999px;
  padding: 6px 11px; font-size: .82rem; background: var(--surface);
}
.social-links a:hover { border-color: var(--accent); color: var(--accent); }
.kicker { margin: 0 0 12px; color: var(--accent); text-transform: uppercase; letter-spacing: .14em; font-size: .75rem; font-weight: 700; }
.hero-content h2, .section h2 {
  font: 600 clamp(2.35rem, 5vw, 4.7rem)/1.05 "Source Serif 4", serif;
  letter-spacing: -.045em; margin: 0 0 28px;
}
.section h2 { font-size: clamp(2.1rem, 4vw, 3.6rem); max-width: 800px; }
.lead { font-size: 1.25rem; color: var(--text); }
.hero-content > p { max-width: 760px; }
.hero-content p:not(.kicker) { color: var(--muted); }
.metrics {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px;
  margin-top: 42px; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  background: var(--line);
}
.metrics div { background: var(--surface); padding: 22px 20px; }
.metrics strong { display: block; font-size: 1.7rem; letter-spacing: -.04em; }
.metrics span { display: block; color: var(--muted); font-size: .78rem; line-height: 1.35; }
.metrics-teaching {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
  margin-top: 42px; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  background: var(--line);
}
.metrics-teaching div { background: var(--surface); padding: 22px 20px; }
.metrics-teaching strong { display: block; font-size: 1.7rem; letter-spacing: -.04em; }
.metrics-teaching span { display: block; color: var(--muted); font-size: .78rem; line-height: 1.35; }
.hero-actions { display: flex; gap: 12px; margin-top: 30px; flex-wrap: wrap; }
.button {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 46px; padding: 0 19px; border-radius: 999px; font-weight: 700;
  text-decoration: none; border: 1px solid var(--line);
}
.button.primary { background: var(--accent); border-color: var(--accent); color: white; }
.button.primary:hover { background: var(--accent-dark); }
.button.secondary { background: var(--surface); }
.section { padding-block: 104px; }
.tone { background: var(--tone); border-block: 1px solid var(--line); }
.timeline { margin-top: 52px; }
.timeline-item {
  display: grid; grid-template-columns: 170px 1fr; gap: 42px;
  padding: 34px 0; border-top: 1px solid var(--line);
}
.timeline-item:last-child { border-bottom: 1px solid var(--line); }
.date { color: var(--muted); font-size: .87rem; font-weight: 600; }
.timeline h3, .publication h3, .card h3, .education-grid h3 { margin: 0; font-size: 1.12rem; line-height: 1.4; }
.organization { margin: 4px 0 10px; color: var(--accent); font-weight: 600; }
.timeline-item p { color: var(--muted); margin-top: 8px; }
.tags { display: flex; flex-wrap: wrap; gap: 7px; }
.tags span, .topic {
  border: 1px solid var(--line); border-radius: 999px; padding: 4px 9px;
  color: var(--muted); font-size: .76rem; background: var(--surface);
}
.split { display: grid; grid-template-columns: 1.15fr .85fr; gap: 70px; align-items: start; }
.feature-list { padding: 0; margin: 32px 0 0; list-style: none; }
.feature-list li { padding: 18px 0; border-top: 1px solid var(--line); }
.feature-list li:last-child { border-bottom: 1px solid var(--line); }
.feature-list strong, .feature-list span { display: block; }
.feature-list span { color: var(--muted); font-size: .92rem; }
.competency-card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow);
}
.competency-card h3 { margin-top: 0; }
.competency-group + .competency-group { border-top: 1px solid var(--line); padding-top: 18px; margin-top: 18px; }
.competency-group h4 { margin: 0 0 6px; font-size: .86rem; color: var(--accent); }
.competency-group p { color: var(--muted); font-size: .86rem; margin: 0; }
.publications { margin-top: 52px; }
.publication {
  display: grid; grid-template-columns: 140px 1fr; gap: 34px;
  border-top: 1px solid var(--line); padding: 30px 0;
}
.publication:last-child { border-bottom: 1px solid var(--line); }
.venue { color: var(--accent); font-weight: 700; font-size: .84rem; }
.publication p { color: var(--muted); font-size: .88rem; margin: 10px 0 14px; }
.text-link { display: inline-block; margin-top: 28px; color: var(--accent); font-weight: 700; text-decoration: none; }
.card-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin-top: 48px; }
.card {
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; background: var(--surface);
}
.card-number { color: var(--accent); font-size: .75rem; font-weight: 700; }
.card h3 { margin-top: 34px; }
.card p { color: var(--muted); }
.education-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 48px; }
.education-grid article { border-top: 2px solid var(--accent); padding-top: 20px; }
.education-grid span { color: var(--accent); font-size: .8rem; font-weight: 700; }
.education-grid p { color: var(--muted); }
.contact-inner { display: flex; justify-content: space-between; align-items: end; gap: 40px; }
.contact-inner h2 { margin-bottom: 12px; }
.contact-inner p { color: var(--muted); }
footer { border-top: 1px solid var(--line); padding: 26px 0; color: var(--muted); font-size: .85rem; }
.footer-inner { display: flex; justify-content: space-between; }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 48px; padding-top: 60px; }
  .profile { position: static; text-align: left; display: grid; grid-template-columns: 110px 1fr; column-gap: 22px; }
  .portrait { width: 110px; grid-row: 1 / 5; margin: 0; }
  .social-links { justify-content: flex-start; }
  .metrics { grid-template-columns: repeat(2, 1fr); }
  .metrics-teaching { grid-template-columns: repeat(2, 1fr); }
  .split { grid-template-columns: 1fr; }
  .education-grid { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none; position: absolute; top: 69px; left: 20px; right: 20px;
    flex-direction: column; align-items: stretch; background: var(--surface);
    border: 1px solid var(--line); border-radius: 14px; padding: 18px; box-shadow: var(--shadow);
  }
  .nav-links.open { display: flex; }
  .timeline-item, .publication { grid-template-columns: 1fr; gap: 10px; }
  .card-grid { grid-template-columns: 1fr; }
  .contact-inner { align-items: start; flex-direction: column; }
  .section { padding-block: 78px; }
}
@media (max-width: 520px) {
  .shell { width: min(100% - 28px, var(--shell)); }
  .hero { padding-block: 40px 70px; }
  .profile { display: block; text-align: center; }
  .portrait { margin: 0 auto 20px; }
  .social-links { justify-content: center; }
  .metrics { grid-template-columns: 1fr 1fr; }
  .metrics-teaching { grid-template-columns: 1fr 1fr; }
  .hero-content h2 { font-size: 2.55rem; }
  .footer-inner { display: block; }
  .footer-inner span { display: block; }
}