:root{
  --bg:#f7f8f7;
  --paper:#ffffff;
  --ink:#171a1e;
  --muted:#626b74;
  --line:#dce1e5;
  --accent:#153a63;
  --accent-soft:#edf3f7;
  --dark:#101820;
  --dark-card:#17222d;
  --max:1160px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  line-height:1.68;
}
img{display:block;max-width:100%}
a{color:inherit}
.container{width:min(calc(100% - 40px),var(--max));margin:0 auto}
.skip-link{position:absolute;left:-9999px}
.skip-link:focus{left:16px;top:16px;z-index:100;background:#fff;padding:9px 12px}

.site-header{
  position:sticky;top:0;z-index:30;
  background:rgba(247,248,247,.94);
  backdrop-filter:blur(12px);
  border-bottom:1px solid rgba(23,26,30,.08)
}
.nav{min-height:70px;display:flex;align-items:center;justify-content:space-between;gap:26px}
.brand{text-decoration:none;font-weight:800;letter-spacing:-.02em}
.nav-links{display:flex;gap:22px;align-items:center}
.nav-links a{text-decoration:none;color:#4b5560;font-size:.9rem;font-weight:650}
.nav-links a:hover{color:var(--accent)}
.menu-button{display:none;border:1px solid var(--line);background:#fff;border-radius:8px;padding:8px 10px;font:inherit;font-weight:700}

.hero{padding:88px 0 78px}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(310px,.65fr);gap:64px;align-items:center}
.eyebrow,.section-label{
  margin:0 0 10px;
  color:var(--accent);
  font-size:.73rem;
  font-weight:800;
  letter-spacing:.14em;
  text-transform:uppercase
}
h1,h2,h3{line-height:1.18;letter-spacing:-.025em}
h1{font-size:clamp(3.4rem,8vw,6.7rem);letter-spacing:-.06em;margin:0 0 12px}
.hero-role{margin:0 0 20px;font-size:1.12rem;font-weight:700;color:#354453}
.hero-text{max-width:790px;font-size:1.16rem;line-height:1.58;color:#303942}
.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}
.button{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:41px;padding:9px 14px;border:1px solid #b9c3cc;border-radius:8px;
  text-decoration:none;font-size:.9rem;font-weight:750;background:transparent
}
.button:hover{border-color:var(--accent);color:var(--accent)}
.button.primary{background:var(--accent);color:white;border-color:var(--accent)}
.button.primary:hover{background:#0e2d4e;color:white}
.contact-line{display:flex;flex-wrap:wrap;gap:9px 18px;margin-top:24px;color:var(--muted);font-size:.91rem}
.contact-line a{color:var(--accent);text-decoration:none}
.portrait{margin:0;border:1px solid var(--line);background:#fff;box-shadow:0 16px 45px rgba(14,32,50,.08);overflow:hidden}
.portrait img{width:100%;aspect-ratio:4/5;object-fit:cover;object-position:center 34%}

.intro{padding:65px 0;background:var(--accent-soft);border-top:1px solid #dae4ec;border-bottom:1px solid #dae4ec}
.intro-grid{display:grid;grid-template-columns:.48fr 1.52fr;gap:68px}
.intro h2,.section-heading h2{margin:0;font-size:clamp(2rem,4.5vw,3.25rem)}
.intro-copy{max-width:820px;font-size:1.05rem}
.intro-copy p:first-child{margin-top:0}

.section{padding:82px 0}
.section-soft{background:#eff2f4}
.section-dark{background:var(--dark);color:#f5f7f9}
.section-heading{margin-bottom:28px}
.section-heading.compact{margin-bottom:20px}
.section-heading.light .section-label,.section-dark .section-label{color:#9dc2e7}

.paper{
  margin-bottom:17px;padding:29px;
  border:1px solid rgba(255,255,255,.15);
  background:rgba(255,255,255,.04)
}
.paper.featured{background:rgba(255,255,255,.075)}
.paper-meta{display:flex;justify-content:space-between;gap:18px;color:#abc5df;font-size:.8rem;font-weight:750;text-transform:uppercase;letter-spacing:.055em}
.paper h3{font-size:1.48rem;margin:11px 0}
.paper p{color:#d2dae2}
.paper-link a,.compact-card a{color:#b5d6f6;text-decoration:none;font-weight:700}
.tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.tags span{border:1px solid rgba(180,211,241,.32);border-radius:999px;padding:5px 9px;font-size:.74rem;font-weight:700;color:#d7e8f8}
.subheading{margin:44px 0 14px}
.subheading h3{font-size:1.3rem}
.research-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.compact-card{padding:22px;border:1px solid rgba(255,255,255,.14);background:rgba(255,255,255,.035)}
.compact-card h3{font-size:1.05rem;margin:7px 0 10px}
.compact-card p{color:#cbd4dc}
.year,.date{font-size:.86rem;font-weight:750;color:var(--muted)}

.timeline{border-top:1px solid var(--line)}
.timeline-row{display:grid;grid-template-columns:210px 1fr;gap:30px;padding:27px 0;border-bottom:1px solid var(--line)}
.timeline-row h3,.clean-card h3{margin:0 0 5px;font-size:1.16rem}
.timeline-row p,.clean-card p{margin:6px 0}
.institution{color:var(--muted);font-weight:600}

.two-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.three-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.clean-card{border:1px solid var(--line);background:#fff;padding:24px}
.simple-list{list-style:none;margin:0;padding:0}
.simple-list li{display:flex;flex-direction:column;gap:4px;padding:15px 0;border-bottom:1px solid var(--line)}
.simple-list span{font-size:.9rem;color:var(--muted)}
.simple-list a{font-size:.88rem;color:var(--accent);font-weight:700;text-decoration:none;margin-top:3px}

.skill-grid{display:grid;grid-template-columns:.5fr 1.5fr;gap:65px}
.skill-grid h2{margin:0;font-size:clamp(2rem,4vw,3rem)}
.skill-columns{display:grid;grid-template-columns:1fr 1fr;gap:26px 38px}
.skill-columns h3{font-size:1rem;margin:0 0 7px}
.skill-columns p{margin:0;color:#cbd4dc}

.professional{padding-top:68px}
.contact-section{padding:68px 0;background:#e7eef4;border-top:1px solid #d2dde6}
.contact-wrap{display:flex;justify-content:space-between;align-items:center;gap:40px}
.contact-wrap h2{margin:0;font-size:clamp(1.7rem,3.2vw,2.5rem);max-width:680px}
.footer{background:#0b1219;color:#aeb8c1;padding:22px 0}
.footer-row{display:flex;justify-content:space-between;gap:18px;font-size:.84rem}

@media(max-width:930px){
  .hero-grid,.intro-grid,.skill-grid{grid-template-columns:1fr}
  .hero-grid,.intro-grid,.skill-grid{gap:38px}
  .portrait{max-width:520px}
  .timeline-row{grid-template-columns:1fr;gap:7px}
  .research-grid,.three-grid,.two-grid,.skill-columns{grid-template-columns:1fr}
  .contact-wrap{align-items:flex-start;flex-direction:column}
  .menu-button{display:block}
  .nav-links{
    display:none;position:absolute;left:0;right:0;top:70px;
    background:#fff;border-bottom:1px solid var(--line);padding:16px 20px;
    flex-direction:column;align-items:flex-start
  }
  .nav-links.open{display:flex}
}
@media(max-width:560px){
  .container{width:min(calc(100% - 28px),var(--max))}
  .hero{padding:62px 0}
  .section{padding:62px 0}
  h1{font-size:3.7rem}
  .paper,.clean-card,.compact-card{padding:20px}
  .paper-meta{flex-direction:column;gap:4px}
  .footer-row{flex-direction:column}
}