:root {
  --ink: #13211f;
  --muted: #5f6c69;
  --line: #dce6e2;
  --paper: #f7faf8;
  --white: #ffffff;
  --teal: #0f6f65;
  --teal-dark: #0a4f49;
  --teal-soft: #e4f1ed;
  --sand: #efe8dd;
  --max: 1180px;
  --radius: 24px;
  --shadow: 0 20px 60px rgba(16, 45, 39, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
.container { width: min(calc(100% - 40px), var(--max)); margin-inline: auto; }
.skip-link { position: fixed; left: 12px; top: -60px; padding: 10px 14px; background: var(--ink); color: white; z-index: 999; }
.skip-link:focus { top: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(18px);
  background: rgba(247, 250, 248, 0.86);
  border-bottom: 1px solid rgba(220, 230, 226, 0.85);
}
.nav-wrap { height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; font-weight: 760; }
.brand-mark { width: 42px; height: 42px; border-radius: 14px; display: grid; place-items: center; background: var(--ink); color: white; letter-spacing: -0.03em; }
.brand-text { font-size: 1.05rem; }
.nav { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; }
.nav a { text-decoration: none; font-size: 0.93rem; color: var(--muted); font-weight: 650; }
.nav a:hover, .nav a.active { color: var(--teal); }

.hero { padding: 86px 0 96px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.72fr); align-items: center; gap: 74px; }
.eyebrow, .section-kicker { text-transform: uppercase; letter-spacing: 0.16em; font-size: 0.76rem; font-weight: 800; color: var(--teal); margin: 0 0 14px; }
h1, h2, h3 { letter-spacing: -0.035em; line-height: 1.08; }
h1 { font-size: clamp(3.6rem, 8vw, 7rem); margin: 0; max-width: 900px; }
.page-hero h1 { font-size: clamp(2.8rem, 6vw, 5rem); }
.role { margin: 22px 0 0; font-size: clamp(1.08rem, 2vw, 1.35rem); color: var(--teal-dark); font-weight: 720; line-height: 1.45; }
.hero-text { max-width: 720px; font-size: clamp(1.08rem, 1.8vw, 1.3rem); color: var(--muted); margin: 26px 0 0; }
.hero-actions { display: flex; gap: 14px; margin-top: 34px; flex-wrap: wrap; }
.button { display: inline-flex; min-height: 50px; padding: 0 22px; align-items: center; justify-content: center; border-radius: 999px; text-decoration: none; font-weight: 760; border: 1px solid var(--teal); transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); }
.button.primary { background: var(--teal); color: white; box-shadow: 0 12px 30px rgba(15,111,101,.2); }
.button.primary:hover { background: var(--teal-dark); }
.button.secondary { color: var(--teal-dark); background: transparent; }
.button.secondary:hover { background: var(--teal-soft); }
.quick-facts { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 30px; }
.quick-facts span { border: 1px solid var(--line); background: rgba(255,255,255,.55); padding: 8px 12px; border-radius: 999px; font-size: 0.82rem; color: var(--muted); }

.portrait-card { position: relative; margin: 0; border-radius: 34px; overflow: hidden; background: var(--sand); box-shadow: var(--shadow); transform: rotate(1.2deg); }
.portrait-card::after { content: ""; position: absolute; inset: 0; box-shadow: inset 0 0 0 1px rgba(255,255,255,.4); pointer-events: none; border-radius: inherit; }
.portrait-card img { width: 100%; aspect-ratio: 4 / 5; object-fit: cover; object-position: 50% 38%; }
.portrait-card figcaption { position: absolute; left: 18px; bottom: 18px; background: rgba(10,24,22,.78); color: white; backdrop-filter: blur(12px); padding: 9px 13px; border-radius: 999px; font-size: .76rem; }

.section { padding: 104px 0; }
.section.alt { background: var(--white); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section h2 { font-size: clamp(2.2rem, 5vw, 4.6rem); margin: 0; }
.section-heading-row { display: grid; grid-template-columns: 1fr minmax(280px, 0.56fr); align-items: end; gap: 40px; margin-bottom: 46px; }
.section-heading-row > p { margin: 0; color: var(--muted); font-size: 1.04rem; }
.split { display: grid; grid-template-columns: .78fr 1.22fr; gap: 80px; }
.prose { max-width: 760px; color: var(--muted); font-size: 1.08rem; }
.prose p:first-child { margin-top: 0; }
.about-prose strong { color: var(--ink); }
.education-block { margin: 38px 0 40px; }
.education-block h3 { margin: 0 0 16px; color: var(--ink); font-size: 1.25rem; letter-spacing: -0.02em; }
.education-list { display: grid; gap: 14px; }
.education-card { display: grid; grid-template-columns: 112px 1fr; gap: 22px; align-items: start; padding: 22px 24px; background: rgba(255,255,255,.72); border: 1px solid var(--line); border-radius: 20px; }
.education-date { color: var(--teal); font-weight: 820; letter-spacing: .01em; }
.education-card h4 { margin: 0 0 4px; color: var(--ink); font-size: 1.08rem; letter-spacing: -0.02em; }
.education-card p { margin: 0; }
.education-card .education-detail { margin-top: 4px; font-size: .92rem; color: #77827f; }

.card-grid { display: grid; gap: 18px; }
.research-grid { grid-template-columns: repeat(4, 1fr); }
.card { min-height: 260px; padding: 28px; background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); }
.card-number { display: inline-flex; width: 42px; height: 42px; border-radius: 13px; align-items: center; justify-content: center; background: var(--teal-soft); color: var(--teal-dark); font-weight: 800; font-size: .82rem; }
.card h3 { font-size: 1.45rem; margin: 58px 0 12px; }
.card p { color: var(--muted); margin: 0; }

.pub-preview { border-top: 1px solid var(--line); }
.preview-item { display: grid; grid-template-columns: 86px 1fr; gap: 26px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.preview-item .pub-year { color: var(--teal); font-weight: 840; font-size: 1.05rem; }
.preview-item h3 { margin: 0 0 6px; font-size: clamp(1.15rem, 2.2vw, 1.55rem); }
.preview-item p { margin: 0; color: var(--muted); }

.publication-group { margin-top: 54px; }
.group-heading { display:flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 18px; }
.group-heading h2, .group-heading h3 { margin:0; }
.group-heading p { margin:0; color:var(--muted); font-size: .98rem; }
.pub-list { border-top: 1px solid var(--line); }
.publication { display: grid; grid-template-columns: 90px 1fr; gap: 24px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.pub-year { color: var(--teal); font-weight: 840; font-size: 1.05rem; }
.publication h3 { margin: 0 0 6px; font-size: clamp(1.05rem, 2vw, 1.4rem); }
.publication p { margin: 0; color: var(--muted); }
.publication a { color: var(--teal); font-weight: 760; text-underline-offset: 4px; }

.project-grid { grid-template-columns: repeat(2, 1fr); }
.project-card { padding: 34px; min-height: 300px; border-radius: var(--radius); background: var(--ink); color: white; position: relative; overflow: hidden; }
.project-card::before { content: ""; position: absolute; width: 180px; height: 180px; border-radius: 50%; background: rgba(75, 198, 183, .14); right: -60px; top: -70px; }
.project-card:nth-child(2), .project-card:nth-child(3) { background: var(--teal-dark); }
.project-card .tag { color: #b9e0d9; text-transform: uppercase; letter-spacing: .14em; font-weight: 800; font-size: .72rem; }
.project-card h3 { font-size: clamp(1.7rem, 3vw, 2.6rem); margin: 54px 0 14px; max-width: 520px; }
.project-card p:last-child { color: #d6e3df; max-width: 560px; }

.teaching-layout { display: grid; grid-template-columns: .7fr 1.3fr; gap: 80px; }
.lead { color: var(--muted); font-size: 1.08rem; max-width: 460px; }
.teaching-list { border-top: 1px solid var(--line); }
.teaching-list > div { display: grid; grid-template-columns: 54px 280px 1fr; gap: 20px; align-items: start; padding: 26px 0; border-bottom: 1px solid var(--line); }
.teaching-list span { color: var(--teal); font-weight: 800; }
.teaching-list strong { font-size: 1.05rem; }
.teaching-list p { margin: 0; color: var(--muted); }

.contact-section { padding-top: 54px; }
.contact-card { display: grid; grid-template-columns: 1.2fr .8fr; gap: 60px; align-items: end; background: var(--teal-soft); border: 1px solid #cfe5df; border-radius: 34px; padding: 54px; }
.contact-card h2 { font-size: clamp(2.6rem, 6vw, 5rem); }
.contact-card p { color: var(--muted); max-width: 650px; }
.contact-links { text-align: right; }
.contact-links a { display: inline-block; font-weight: 820; color: var(--teal-dark); font-size: clamp(1.15rem, 2.4vw, 1.7rem); text-underline-offset: 6px; }
.contact-links p { margin: 10px 0 0; }

.note-box { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 24px; color: var(--muted); }
.page-hero { padding: 72px 0 40px; }
.page-meta { display:flex; gap:12px; flex-wrap: wrap; margin-top:18px; }
.page-meta span { border: 1px solid var(--line); border-radius: 999px; padding: 8px 12px; font-size: .84rem; color: var(--muted); background: rgba(255,255,255,.65); }

.site-footer { padding: 30px 0 40px; }
.footer-row { display: flex; justify-content: space-between; gap: 20px; color: var(--muted); font-size: .88rem; }
.footer-row a { color: var(--teal-dark); font-weight: 700; text-decoration: none; }

@media (max-width: 980px) {
  .nav { display: none; }
  .hero-grid, .split, .teaching-layout, .contact-card { grid-template-columns: 1fr; }
  .hero { padding-top: 58px; }
  .portrait-card { max-width: 650px; transform: none; }
  .research-grid { grid-template-columns: repeat(2, 1fr); }
  .section-heading-row { grid-template-columns: 1fr; align-items: start; }
  .teaching-list > div { grid-template-columns: 44px 1fr; }
  .teaching-list p { grid-column: 2; }
  .contact-links { text-align: left; }
}

@media (max-width: 680px) {
  .container { width: min(calc(100% - 28px), var(--max)); }
  .nav-wrap { height: 66px; }
  .brand-text { font-size: .98rem; }
  .hero { padding: 48px 0 70px; }
  h1 { font-size: clamp(2.8rem, 17vw, 5rem); }
  .section { padding: 74px 0; }
  .research-grid, .project-grid { grid-template-columns: 1fr; }
  .publication, .preview-item { grid-template-columns: 1fr; gap: 8px; padding: 22px 0; }
  .education-card { grid-template-columns: 1fr; gap: 8px; padding: 20px; }
  .contact-card { padding: 32px; }
  .footer-row { flex-direction: column; }
  .portrait-card img { aspect-ratio: 1 / 1.18; }
}