:root {
  --paper: #f7f6f2;
  --paper-light: #fbfaf7;
  --white: #ffffff;
  --ink: #171715;
  --ink-soft: #33332f;
  --muted: #6d6c66;
  --quiet: #98968f;
  --blue: #193f67;
  --blue-dark: #102f50;
  --blue-light: #e9eef4;
  --line: #d8d6ce;
  --line-dark: #bcb9b0;
  --serif: "Source Serif 4", Georgia, serif;
  --sans: "Inter", Arial, sans-serif;
  --max-width: 1160px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; }
.container { width: min(calc(100% - 80px), var(--max-width)); margin: 0 auto; }
.section { padding: 120px 0; }
.section-number, .small-label, .project-label, .eyebrow {
  color: var(--blue);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .12em;
  line-height: 1.5;
  text-transform: uppercase;
}
.section-number { margin: 0 0 14px; }
.section-heading {
  display: grid;
  grid-template-columns: minmax(260px, .9fr) minmax(360px, 1.1fr);
  gap: 100px;
  align-items: end;
  margin-bottom: 70px;
}
.section-heading h2, .cv-section h2, .contact-section h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(42px, 5vw, 64px);
  font-weight: 400;
  line-height: 1;
  letter-spacing: -.035em;
}
.section-intro { max-width: 610px; margin: 0; color: var(--muted); font-size: 16px; line-height: 1.8; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(247, 246, 242, .96);
  border-bottom: 1px solid rgba(216, 214, 206, .8);
  backdrop-filter: blur(10px);
}
.nav-container { display: flex; height: 70px; align-items: center; justify-content: space-between; }
.site-name { font-family: var(--serif); font-size: 18px; font-weight: 600; letter-spacing: .02em; }
.desktop-nav { display: flex; align-items: center; gap: 29px; }
.desktop-nav a { color: var(--muted); font-size: 13px; transition: color .2s ease; }
.desktop-nav a:hover { color: var(--ink); }
.desktop-nav .nav-cv { padding-bottom: 3px; border-bottom: 1px solid var(--ink); color: var(--ink); }
.mobile-menu-button { display: none; padding: 6px 0; border: 0; background: none; color: var(--ink); cursor: pointer; }
.mobile-nav { display: none; }

.hero { padding: 120px 0 115px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) 290px; gap: 95px; align-items: start; }
.eyebrow { margin: 0 0 28px; }
.hero h1 { margin: 0; font-family: var(--serif); font-size: clamp(58px, 7.3vw, 91px); font-weight: 400; line-height: .94; letter-spacing: -.05em; }
.hero-position { margin: 23px 0 0; color: var(--quiet); font-size: 13px; letter-spacing: .02em; }
.hero h2 { max-width: 780px; margin: 43px 0 0; font-family: var(--serif); font-size: clamp(27px, 3.5vw, 39px); font-weight: 400; line-height: 1.22; letter-spacing: -.027em; }
.hero-intro { max-width: 690px; margin: 30px 0 0; color: var(--muted); font-size: 16px; line-height: 1.85; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 30px; margin-top: 36px; }
.text-link { display: inline-flex; gap: 8px; align-items: center; padding-bottom: 3px; border-bottom: 1px solid var(--ink); font-size: 13px; font-weight: 500; }
.text-link:hover { border-color: var(--blue); color: var(--blue); }
.hero-facts { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; margin-top: 72px; padding-top: 26px; border-top: 1px solid var(--line); }
.hero-fact strong { display: block; margin-bottom: 3px; font-family: var(--serif); font-size: 25px; font-weight: 500; line-height: 1.1; }
.hero-fact span { display: block; color: var(--quiet); font-size: 12px; line-height: 1.5; }
.hero-note { margin-top: 18px; padding: 27px 24px 24px; background: var(--blue-light); }
.note-rule { width: 38px; height: 1px; margin-bottom: 35px; background: var(--blue); }
.hero-note .small-label { margin: 0 0 15px; color: var(--blue); font-size: 11px; }
.hero-note-title { margin: 0; color: var(--blue-dark); font-family: var(--serif); font-size: 27px; line-height: 1.15; letter-spacing: -.02em; }
.note-list { margin-top: 43px; border-top: 1px solid rgba(25, 63, 103, .22); }
.note-list div { display: grid; grid-template-columns: 28px 1fr; gap: 10px; padding: 14px 0; border-bottom: 1px solid rgba(25, 63, 103, .22); }
.note-list span { color: var(--blue); font-family: var(--serif); font-size: 12px; }
.note-list p { margin: 0; color: var(--blue-dark); font-size: 14px; line-height: 1.5; }
.hero-note-footer { margin: 39px 0 0; color: var(--muted); font-size: 13px; line-height: 1.6; }

.work-section { background: var(--paper-light); }
.work-list, .expertise-list, .timeline { border-top: 1px solid var(--line-dark); }
.work-item { border-bottom: 1px solid var(--line); }
.work-row {
  display: grid;
  grid-template-columns: 60px 150px minmax(0, 1fr) 110px;
  gap: 32px;
  align-items: start;
  padding: 41px 0 43px;
  cursor: pointer;
  list-style: none;
}
.work-row::-webkit-details-marker { display: none; }
.work-index { padding-top: 5px; color: var(--quiet); font-family: var(--serif); font-size: 13px; }
.work-location { padding-top: 5px; color: var(--blue); font-size: 12px; font-weight: 600; letter-spacing: .1em; line-height: 1.5; text-transform: uppercase; }
.work-main { max-width: 680px; }
.work-main strong { display: block; margin-bottom: 13px; font-family: var(--serif); font-size: 27px; font-weight: 400; line-height: 1.24; letter-spacing: -.02em; }
.work-main span, .work-main em { display: block; color: var(--muted); font-size: 14px; font-style: normal; line-height: 1.75; }
.work-main em { margin-top: 14px; color: var(--quiet); font-size: 13px; }
.project-button { align-self: center; justify-self: end; padding: 5px 0; border-bottom: 1px solid var(--line-dark); color: var(--ink); font-size: 13px; white-space: nowrap; }
.project-button b { font-weight: 400; }
.work-row:hover .project-button, .work-item[open] .project-button { border-color: var(--blue); color: var(--blue); }
.work-item[open] .project-button b { display: inline-block; transform: rotate(90deg); }
.work-detail { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 45px; padding: 0 0 47px 242px; }
.work-detail > div { padding-top: 20px; border-top: 1px solid var(--line); }
.project-label { margin: 0 0 14px; color: var(--quiet); font-size: 12px; }
.work-detail p:not(.project-label), .work-detail li { margin: 0; color: var(--ink-soft); font-size: 15px; line-height: 1.8; }
.work-detail ul { margin: 0; padding: 0; list-style: none; }
.work-detail li { position: relative; margin-bottom: 9px; padding-left: 15px; }
.work-detail li::before { position: absolute; top: .75em; left: 0; width: 4px; height: 4px; border-radius: 50%; background: var(--blue); content: ""; }
.work-detail p.methods { margin-top: 19px; color: var(--muted); font-size: 13px; }
.work-detail-links { display: flex; gap: 24px; flex-wrap: wrap; margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--line); }
.work-detail-links a { font-size: 13px; font-weight: 500; color: var(--blue); border-bottom: 1px solid var(--blue); padding-bottom: 2px; }
.work-detail-links a:hover { color: var(--blue-dark); border-color: var(--blue-dark); }

.expertise-section { background: var(--paper); }
.expertise-row { display: grid; grid-template-columns: 60px minmax(230px, .75fr) minmax(0, 1.25fr); gap: 35px; padding: 36px 0; border-bottom: 1px solid var(--line); }
.expertise-number { padding-top: 3px; color: var(--quiet); font-family: var(--serif); font-size: 13px; }
.expertise-row h3 { margin: 0; font-family: var(--serif); font-size: 23px; font-weight: 400; line-height: 1.25; }
.expertise-row p { max-width: 650px; margin: 0; color: var(--muted); font-size: 15px; line-height: 1.75; }
.expertise-row .expertise-tools { margin-top: 11px; color: var(--quiet); font-size: 12px; }

.research-section { background: var(--paper-light); }
.research-feature { display: grid; grid-template-columns: minmax(280px, .95fr) minmax(360px, 1.05fr); gap: 100px; padding: 55px 0; border-top: 1px solid var(--line-dark); border-bottom: 1px solid var(--line); }
.small-label { margin: 0 0 13px; color: var(--quiet); font-size: 11px; }
.research-feature h3 { max-width: 500px; margin: 0; font-family: var(--serif); font-size: 31px; font-weight: 400; line-height: 1.24; }
.research-feature p { margin: 0 0 18px; color: var(--muted); font-size: 15px; line-height: 1.8; }
.research-topics { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 45px; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.research-topics div { min-height: 150px; padding: 25px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.research-topics span { color: var(--quiet); font-family: var(--serif); font-size: 13px; }
.research-topics p { max-width: 245px; margin: 28px 0 0; font-family: var(--serif); font-size: 18px; line-height: 1.4; }

.experience-section { background: var(--paper); }
.experience-layout { display: grid; grid-template-columns: minmax(260px, .8fr) minmax(480px, 1.2fr); gap: 110px; }
.experience-intro p { margin: 0 0 22px; color: var(--muted); font-family: var(--serif); font-size: 19px; line-height: 1.65; }
.timeline-item { display: grid; grid-template-columns: 125px minmax(0, 1fr); gap: 35px; padding: 28px 0 31px; border-bottom: 1px solid var(--line); }
.timeline-date { padding-top: 3px; color: var(--quiet); font-size: 12px; }
.timeline-item h3 { margin: 0 0 3px; font-family: var(--serif); font-size: 22px; font-weight: 400; }
.timeline-org { margin: 0 0 11px; color: var(--blue); font-size: 13px; font-weight: 500; }
.timeline-item p:last-child { max-width: 570px; margin: 0; color: var(--muted); font-size: 15px; line-height: 1.7; }
.timeline-item.current h3 { color: var(--blue); }

.cv-section { padding: 92px 0; background: var(--blue); color: var(--white); }
.cv-layout { display: flex; align-items: center; justify-content: space-between; gap: 60px; }
.cv-section .section-number { color: rgba(255,255,255,.58); }
.cv-section h2 { margin-bottom: 14px; font-size: 48px; }
.cv-section p:not(.section-number) { max-width: 580px; margin: 0; color: rgba(255,255,255,.7); font-size: 14px; }
.cv-button { display: flex; min-width: 150px; justify-content: space-between; gap: 30px; padding: 15px 0; border-top: 1px solid rgba(255,255,255,.5); border-bottom: 1px solid rgba(255,255,255,.5); font-size: 13px; }
.cv-button:hover { color: #dce8f3; }

.contact-section { padding: 115px 0; background: var(--ink); color: var(--white); }
.contact-layout { display: grid; grid-template-columns: minmax(280px, .8fr) minmax(400px, 1.2fr); gap: 100px; }
.contact-section .section-number { color: rgba(255,255,255,.45); }
.contact-section h2 { font-size: clamp(45px, 6vw, 70px); }
.contact-lead { max-width: 520px; margin: 6px 0 45px; color: rgba(255,255,255,.63); font-family: var(--serif); font-size: 20px; line-height: 1.6; }
.contact-links { display: flex; flex-direction: column; }
.contact-links a { display: flex; justify-content: space-between; padding: 16px 0; border-top: 1px solid rgba(255,255,255,.16); color: rgba(255,255,255,.86); font-size: 13px; }
.contact-links a:last-child { border-bottom: 1px solid rgba(255,255,255,.16); }
.contact-links a:hover { color: #dce8f3; }
footer { padding: 24px 0; background: var(--ink); color: rgba(255,255,255,.37); border-top: 1px solid rgba(255,255,255,.08); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.footer-inner p, .footer-inner a { margin: 0; font-size: 11px; }

@media (max-width: 960px) {
  .container { width: min(calc(100% - 48px), var(--max-width)); }
  .desktop-nav { gap: 19px; }
  .hero-grid { grid-template-columns: minmax(0, 1fr) 235px; gap: 55px; }
  .hero-facts { grid-template-columns: repeat(2, 1fr); }
  .section-heading { gap: 55px; }
  .work-row { grid-template-columns: 45px 120px minmax(0, 1fr); }
  .project-button { grid-column: 3; justify-self: start; }
  .work-detail { padding-left: 197px; }
  .expertise-row { grid-template-columns: 45px 210px minmax(0, 1fr); }
  .research-feature { gap: 60px; }
  .experience-layout { gap: 70px; }
}

@media (max-width: 760px) {
  .container { width: calc(100% - 36px); }
  .nav-container { height: 62px; }
  .desktop-nav { display: none; }
  .mobile-menu-button { display: block; font-size: 13px; }
  .mobile-nav { width: calc(100% - 36px); margin: 0 auto; padding: 4px 0 18px; }
  .mobile-nav.open { display: flex; flex-direction: column; }
  .mobile-nav a { padding: 10px 0; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 13px; }
  .section { padding: 82px 0; }
  .section-heading { grid-template-columns: 1fr; gap: 30px; margin-bottom: 48px; }
  .section-heading h2 { font-size: 45px; }
  .hero { padding: 79px 0 80px; }
  .hero-grid { grid-template-columns: 1fr; gap: 55px; }
  .hero h1 { font-size: 58px; }
  .hero h2 { margin-top: 35px; font-size: 29px; }
  .hero-intro { font-size: 15px; }
  .hero-facts { gap: 25px 20px; margin-top: 55px; }
  .hero-note { max-width: 390px; margin-top: 0; }
  .work-row { grid-template-columns: 38px minmax(0, 1fr); gap: 12px 18px; padding: 32px 0; }
  .work-index { grid-row: 1 / span 4; }
  .work-location, .work-main, .project-button { grid-column: 2; }
  .work-main strong { font-size: 24px; }
  .project-button { margin-top: 3px; }
  .work-detail { grid-template-columns: 1fr; gap: 23px; padding: 0 0 35px 56px; }
  .expertise-row { grid-template-columns: 35px minmax(0, 1fr); gap: 12px 16px; padding: 29px 0; }
  .expertise-row > div { grid-column: 2; }
  .expertise-row h3 { font-size: 21px; }
  .research-feature { grid-template-columns: 1fr; gap: 30px; padding: 40px 0; }
  .research-topics { grid-template-columns: repeat(2, 1fr); }
  .experience-layout { grid-template-columns: 1fr; gap: 50px; }
  .experience-intro p { font-size: 18px; }
  .timeline-item { grid-template-columns: 95px minmax(0, 1fr); gap: 22px; }
  .cv-layout { flex-direction: column; align-items: flex-start; }
  .cv-section h2 { font-size: 42px; }
  .cv-button { width: 100%; }
  .contact-layout { grid-template-columns: 1fr; gap: 50px; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 49px; }
  .hero-actions { gap: 20px; }
  .research-topics { grid-template-columns: 1fr; }
  .research-topics div { min-height: 125px; }
  .timeline-item { grid-template-columns: 1fr; gap: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}