:root {
  --bg: #f6f7f4;
  --surface: #ffffff;
  --ink: #101623;
  --muted: #657083;
  --line: #dfe4e8;
  --dark: #0b1220;
  --accent: #0f766e;
  --accent-soft: #dff3ef;
  --max: 1160px;
  --radius: 18px;
  --shadow: 0 16px 50px rgba(16, 22, 35, 0.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
.container { width: min(calc(100% - 40px), var(--max)); margin: 0 auto; }

.site-header {
  position: sticky; top: 0; z-index: 20;
  background: rgba(246,247,244,.88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(223,228,232,.75);
}
.nav { min-height: 74px; display: flex; align-items: center; gap: 24px; }
.brand { font-size: 1.3rem; font-weight: 850; letter-spacing: -.05em; margin-right: auto; }
.brand span { color: var(--accent); }
.nav-links { display: flex; gap: 22px; font-size: .92rem; color: #495466; }
.nav-links a:hover, .quick-links a:hover, .text-link:hover { color: var(--accent); }
.nav-cta, .button {
  border-radius: 999px; padding: 10px 16px; font-weight: 750;
  border: 1px solid var(--line);
}
.nav-cta { background: var(--dark); color: white; border-color: var(--dark); }
.nav-toggle { display: none; background: none; border: 0; font-size: 1.3rem; }

.hero {
  display: grid; grid-template-columns: 1.5fr .85fr; gap: 50px;
  padding: 110px 0 70px; align-items: end;
}
.eyebrow { margin: 0 0 12px; font-size: .72rem; font-weight: 850; letter-spacing: .16em; color: var(--accent); }
.hero h1 { max-width: 790px; margin: 0; font-size: clamp(2.8rem, 6vw, 5.8rem); line-height: .98; letter-spacing: -.065em; }
.lede { max-width: 680px; margin: 26px 0 0; color: var(--muted); font-size: 1.13rem; }
.hero-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 28px; }
.button { display: inline-flex; align-items: center; justify-content: center; }
.button.primary { background: var(--dark); color: white; border-color: var(--dark); }
.button.secondary { background: transparent; }
.quick-links { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 22px; font-size: .84rem; color: #586273; }
.hero-card { background: var(--dark); color: white; padding: 28px; border-radius: var(--radius); box-shadow: var(--shadow); }
.status-dot { width: 10px; height: 10px; border-radius: 50%; background: #54d6c6; margin-bottom: 22px; }
.card-label { font-size: .7rem; letter-spacing: .15em; color: #9ca9ba; font-weight: 800; }
.hero-card h2 { font-size: 1.55rem; line-height: 1.15; letter-spacing: -.03em; margin: 12px 0; }
.hero-card p { color: #c6cfda; font-size: .92rem; }
.text-link { color: var(--accent); font-weight: 800; font-size: .9rem; }
.hero-card .text-link { color: #8ce5da; }

.stats { display: grid; grid-template-columns: repeat(4,1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.stats > div { padding: 25px 10px; display: grid; gap: 4px; }
.stats strong { font-size: 1.35rem; letter-spacing: -.03em; }
.stats span { color: var(--muted); font-size: .82rem; }

.section { padding: 105px 0; }
.alt { background: #eef1ef; }
.section-heading { max-width: 760px; margin-bottom: 34px; }
.section-heading h2, .split h2, .contact-box h2 { margin: 0; font-size: clamp(2.1rem, 4vw, 3.4rem); line-height: 1.03; letter-spacing: -.055em; }
.section-heading > p:last-child, .section-copy { color: var(--muted); font-size: 1rem; }

.research-grid, .project-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.research-card, .project-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; min-height: 300px; }
.research-card.featured { background: var(--accent-soft); border-color: #c8e6e0; }
.number { color: var(--muted); font-size: .76rem; font-weight: 800; }
.research-card h3, .project-card h3 { font-size: 1.45rem; line-height: 1.15; letter-spacing: -.035em; margin: 22px 0 10px; }
.research-card p, .project-card p { color: var(--muted); font-size: .94rem; }
.tags, .skill-cloud { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; }
.tags span, .skill-cloud span { border: 1px solid var(--line); border-radius: 999px; padding: 6px 10px; font-size: .72rem; color: #586273; background: rgba(255,255,255,.65); }

.publication-list { display: grid; gap: 14px; }
.publication { display: grid; grid-template-columns: 90px 1fr auto; gap: 24px; align-items: center; border-top: 1px solid var(--line); padding: 25px 0; }
.pub-year { font-size: .78rem; font-weight: 850; letter-spacing: .08em; color: var(--accent); }
.publication h3 { margin: 0 0 6px; font-size: 1.15rem; }
.publication p { margin: 0; color: var(--muted); font-size: .92rem; }

.project-card { min-height: 310px; }
.project-top { display: flex; justify-content: space-between; color: var(--muted); font-size: .72rem; font-weight: 800; letter-spacing: .08em; }
.project-type { color: var(--accent); }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; align-items: start; }
.timeline { display: grid; gap: 0; }
.timeline-item { display: grid; grid-template-columns: 90px 1fr; gap: 18px; padding: 0 0 28px; margin-bottom: 28px; border-bottom: 1px solid var(--line); }
.timeline-item > span { color: var(--accent); font-size: .75rem; font-weight: 850; letter-spacing: .08em; text-transform: uppercase; }
.timeline-item h3 { margin: 0 0 5px; font-size: 1.15rem; }
.timeline-item p { margin: 0; color: var(--muted); font-size: .9rem; }

.skills { padding-top: 80px; padding-bottom: 95px; }
.skill-cloud { gap: 10px; }
.skill-cloud span { padding: 9px 13px; background: var(--surface); }

.contact { padding-top: 20px; }
.contact-box { background: var(--dark); color: white; border-radius: 24px; padding: 50px; display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px; }
.contact-box p:not(.eyebrow) { color: #b8c3d0; max-width: 620px; }
.contact-box .eyebrow { color: #83ddd3; }
.contact-links { display: grid; align-content: center; gap: 14px; }
.contact-links a { color: #dce4ed; border-bottom: 1px solid #394456; padding-bottom: 10px; }
.contact-links a:hover { color: #83ddd3; }

.footer { padding: 25px 0 45px; display: flex; justify-content: space-between; gap: 20px; color: #768193; font-size: .78rem; }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding-top: 85px; }
  .research-grid, .project-grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .split, .contact-box { grid-template-columns: 1fr; }
  .nav-links { display: none; position: absolute; left: 20px; right: 20px; top: 65px; background: white; border: 1px solid var(--line); border-radius: 14px; padding: 16px; box-shadow: var(--shadow); }
  .nav-links.open { display: grid; }
  .nav-toggle { display: block; }
}

@media (max-width: 620px) {
  .container { width: min(calc(100% - 26px), var(--max)); }
  .hero { padding: 68px 0 52px; gap: 30px; }
  .section { padding: 72px 0; }
  .stats > div { padding: 18px 8px; }
  .publication { grid-template-columns: 1fr; gap: 10px; }
  .contact-box { padding: 30px; }
  .footer { flex-direction: column; }
}