:root {
  --paper: #ffffff;
  --paper-deep: #e8eef5;
  --ink: #13243a;
  --muted: #5a6878;
  --line: rgba(19, 36, 58, 0.16);
  --navy: #173f6b;
  --navy-soft: #2c6497;
  --rust: #a65335;
  --white: #ffffff;
  --serif: "Source Serif 4", Georgia, serif;
  --sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --page: min(1180px, calc(100vw - 80px));
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; overflow-x: hidden; overflow-x: clip; background: var(--paper); color: var(--ink); font-family: var(--sans); font-size: 16px; line-height: 1.65; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { color: inherit; font: inherit; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; top: 8px; left: 8px; z-index: 100; padding: 10px 16px; background: var(--ink); color: var(--white); transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: 2px solid var(--rust); outline-offset: 4px; }

.site-header { position: fixed; top: 0; right: 0; left: 0; z-index: 50; display: flex; align-items: center; justify-content: space-between; width: 100%; height: 84px; padding: 0 max(40px, calc((100vw - 1180px) / 2)); border-bottom: 1px solid transparent; transition: background 220ms ease, border-color 220ms ease, height 220ms ease; }
.site-header.scrolled { height: 68px; border-color: var(--line); background: rgba(255, 255, 255, 0.94); backdrop-filter: blur(14px); }
.wordmark { display: flex; align-items: center; gap: 12px; font-weight: 600; letter-spacing: -0.02em; }
.wordmark-mark { display: grid; width: 36px; height: 36px; place-items: center; border: 1px solid var(--ink); border-radius: 50%; font-family: var(--serif); font-size: 18px; font-weight: 400; }
.site-nav { display: flex; align-items: center; gap: 24px; font-size: 14px; }
.site-nav a { position: relative; }
.site-nav a:not(.nav-contact)::after { position: absolute; right: 0; bottom: -4px; left: 0; height: 1px; background: var(--ink); content: ""; transform: scaleX(0); transform-origin: right; transition: transform 180ms ease; }
.site-nav a:hover::after { transform: scaleX(1); transform-origin: left; }
.nav-contact { padding: 9px 16px; border: 1px solid var(--ink); border-radius: 100px; transition: background 180ms ease, color 180ms ease; }
.nav-contact:hover { background: var(--ink); color: var(--white); }
.menu-button { display: none; width: 42px; height: 42px; padding: 10px; border: 0; background: transparent; }
.menu-button > span:not(.sr-only) { display: block; width: 22px; height: 1px; margin: 6px 0; background: var(--ink); transition: transform 180ms ease; }

.hero { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(360px, 0.7fr); gap: clamp(70px, 9vw, 140px); align-items: center; width: var(--page); min-height: 100svh; margin: auto; padding: 132px 0 72px; }
.eyebrow, .kicker { margin: 0 0 24px; color: var(--navy-soft); font-size: 12px; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase; }
.eyebrow { display: flex; align-items: center; gap: 10px; font-size: 14px; }
.eyebrow span { display: block; width: 32px; height: 1px; background: var(--rust); }
h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 820px; margin-bottom: 30px; font-family: var(--serif); font-size: clamp(54px, 5.8vw, 86px); font-weight: 400; letter-spacing: -0.042em; line-height: 0.98; }
h1 em, .large-copy em { color: var(--rust); font-weight: 400; }
.hero-intro { max-width: 680px; margin-bottom: 34px; color: var(--muted); font-size: clamp(17px, 1.45vw, 20px); line-height: 1.7; }
.hero-actions { display: flex; align-items: center; gap: 28px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 28px; min-height: 50px; padding: 0 20px; border-radius: 2px; font-size: 14px; font-weight: 500; transition: transform 180ms ease, background 180ms ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--navy); color: var(--white); }
.button-primary:hover { background: var(--navy-soft); }
.text-link { display: inline-flex; align-items: center; gap: 8px; padding-bottom: 2px; border-bottom: 1px solid currentColor; font-size: 14px; }
.hero-status { display: flex; align-items: center; gap: 10px; margin-top: 42px; color: var(--muted); font-size: 13px; }
.hero-status p { margin: 0; }
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: #3974a6; box-shadow: 0 0 0 5px rgba(57, 116, 166, 0.12); }
.hero-visual { position: relative; align-self: stretch; min-height: 560px; }
.portrait-frame { position: absolute; top: 5%; right: 0; z-index: 2; width: min(380px, 90%); background: var(--navy); box-shadow: 18px 22px 0 var(--paper-deep); transform: rotate(1.4deg); }
.portrait-frame img { width: 100%; height: 475px; filter: saturate(0.62) contrast(1.02); object-fit: cover; object-position: 50% 24%; }
.portrait-caption { display: flex; justify-content: space-between; gap: 20px; padding: 15px 18px; color: var(--white); font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; }
.orbit { position: absolute; border: 1px solid rgba(184, 83, 45, 0.45); border-radius: 50%; }
.orbit::after { position: absolute; width: 9px; height: 9px; border-radius: 50%; background: var(--rust); content: ""; }
.orbit-one { top: 1%; right: -10%; width: 470px; height: 470px; transform: rotate(-20deg); }
.orbit-one::after { top: 66px; left: 54px; }
.orbit-two { right: 8%; bottom: 0; width: 280px; height: 190px; transform: rotate(28deg); }
.orbit-two::after { right: 26px; bottom: 40px; }
.formula-card { position: absolute; bottom: 4%; left: -12%; z-index: 3; width: 220px; padding: 20px; border: 1px solid rgba(255,255,255,.28); background: rgba(23, 63, 107, 0.94); color: var(--white); box-shadow: 0 18px 55px rgba(19,36,58,.16); backdrop-filter: blur(10px); }
.formula-card > span { font-family: var(--serif); font-size: 32px; font-style: italic; }
.formula-line { width: 100%; height: 36px; margin: 7px 0 4px; background: linear-gradient(155deg, transparent 0 16%, #e0a88e 17% 19%, transparent 20% 38%, #e0a88e 39% 41%, transparent 42% 58%, #e0a88e 59% 61%, transparent 62%); }
.formula-card small { color: rgba(255,255,255,.68); font-size: 9px; letter-spacing: .05em; text-transform: uppercase; }

.section { width: var(--page); margin: auto; padding: 130px 0; border-top: 1px solid var(--line); }
.section-label { margin-bottom: 76px; color: var(--muted); font-size: 11px; font-weight: 600; letter-spacing: .13em; text-transform: uppercase; }
.intro { display: grid; grid-template-columns: 180px 1fr; gap: 70px; }
.intro .section-label { margin: 12px 0 0; }
.large-copy { max-width: 890px; margin-bottom: 55px; font-family: var(--serif); font-size: clamp(38px, 4.5vw, 64px); letter-spacing: -.035em; line-height: 1.05; }
.intro-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; max-width: 820px; margin-left: auto; color: var(--muted); }
.impact-grid { display: grid; grid-template-columns: repeat(4, 1fr); max-width: 820px; margin: 54px 0 0 auto; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.impact-grid div { display: flex; min-height: 105px; padding: 20px; border-right: 1px solid var(--line); flex-direction: column; justify-content: center; }
.impact-grid div:first-child { padding-left: 0; }
.impact-grid div:last-child { border-right: 0; }
.impact-grid strong { font-family: var(--serif); font-size: 35px; font-weight: 400; line-height: 1; }
.impact-grid span { margin-top: 8px; color: var(--muted); font-size: 10px; letter-spacing: .06em; text-transform: uppercase; }
.section-heading { max-width: 780px; margin-bottom: 64px; }
h2 { margin-bottom: 0; font-family: var(--serif); font-size: clamp(46px, 5vw, 70px); font-weight: 400; letter-spacing: -.04em; line-height: 1.02; }
.research-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.research-card { --card-blue: var(--navy); position: relative; display: flex; min-height: 500px; padding: 26px; overflow: hidden; border: 1px solid transparent; background: var(--card-blue); color: var(--white); flex-direction: column; transition: border-color 220ms ease, transform 220ms ease, box-shadow 220ms ease; }
.research-card:hover { border-color: rgba(255,255,255,.48); box-shadow: 0 22px 55px rgba(19,36,58,.16); transform: translateY(-5px); }
.phonon-card { --card-blue: #356f9f; }
.electron-card { --card-blue: #214f7b; }
.ml-card { --card-blue: #4b6fa8; }
.card-number { color: rgba(255,255,255,.66); font-size: 11px; }
.research-symbol { position: relative; height: 155px; margin: 30px 0; }
.phonon-symbol { display: flex; align-items: center; justify-content: center; gap: 20px; }
.phonon-symbol i { display: block; width: 16px; height: 16px; border-radius: 50%; background: #e1aa91; }
.phonon-symbol i:nth-child(2), .phonon-symbol i:nth-child(4) { transform: translateY(-28px); }
.phonon-symbol::before, .phonon-symbol::after { position: absolute; width: 80%; height: 60px; border-top: 1px solid rgba(255,255,255,.58); border-radius: 50%; content: ""; }
.phonon-symbol::after { border-top: 0; border-bottom: 1px solid rgba(255,255,255,.58); }
.moire-symbol i { position: absolute; inset: 14px 20%; border: 1px solid rgba(255,255,255,.55); background-image: repeating-linear-gradient(60deg, transparent 0 14px, rgba(255,255,255,.35) 15px 16px); transform: rotate(9deg); }
.moire-symbol i:last-child { transform: rotate(-9deg); }
.neural-symbol { display: flex; align-items: center; justify-content: space-between; padding: 12px 62px; }
.neural-symbol::before { position: absolute; inset: 18px 21%; background-image: repeating-linear-gradient(28deg, transparent 0 15px, rgba(255,255,255,.24) 16px 17px, transparent 18px 32px), repeating-linear-gradient(-28deg, transparent 0 15px, rgba(255,255,255,.24) 16px 17px, transparent 18px 32px); content: ""; }
.neural-layer { position: relative; z-index: 1; display: flex; align-items: center; justify-content: center; gap: 11px; flex-direction: column; }
.neural-layer i { display: block; width: 13px; height: 13px; border: 1px solid rgba(255,255,255,.8); border-radius: 50%; background: var(--card-blue); box-shadow: 0 0 0 4px rgba(255,255,255,.05); }
.neural-layer:nth-child(2) i { width: 14px; height: 14px; border-color: #e1aa91; background: #e1aa91; }
.neural-layer:last-child i { border-color: var(--white); background: var(--white); }
.research-card h3 { margin: auto 0 12px; font-family: var(--serif); font-size: 32px; font-weight: 400; line-height: 1.05; }
.research-card h3 small { display: block; max-width: 260px; margin-top: 8px; color: rgba(255,255,255,.62); font-family: var(--sans); font-size: 10px; font-weight: 500; letter-spacing: .07em; line-height: 1.35; text-transform: uppercase; }
.research-card p { min-height: 92px; margin-bottom: 22px; color: rgba(255,255,255,.72); font-size: 14px; }
.tags { display: flex; gap: 7px; flex-wrap: wrap; }
.tags span { padding: 5px 9px; border: 1px solid rgba(255,255,255,.24); border-radius: 100px; color: rgba(255,255,255,.76); font-size: 10px; }
.card-cta { display: flex; justify-content: space-between; margin-top: 24px; padding-top: 15px; border-top: 1px solid rgba(255,255,255,.24); color: rgba(255,255,255,.84); font-size: 11px; font-weight: 500; letter-spacing: .05em; text-transform: uppercase; }
.card-cta span { transition: transform 180ms ease; }
.research-card:hover .card-cta span { transform: translate(3px, -3px); }

.background-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: clamp(60px, 9vw, 135px); }
.timeline { border-top: 1px solid var(--ink); }
.timeline article { display: grid; grid-template-columns: 105px 1fr; gap: 25px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.timeline-year { color: var(--rust); font-family: var(--serif); font-size: 18px; }
.timeline h3 { margin: 0 0 3px; font-size: 15px; font-weight: 600; line-height: 1.35; }
.timeline p { margin: 0 0 3px; color: var(--muted); font-size: 13px; }
.timeline small { color: var(--muted); font-size: 11px; }
.timeline .education-entry { background: var(--paper); }

.publication-heading { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 60px; }
.publication-heading .kicker { margin-bottom: 16px; }
.publication-links { display: flex; gap: 22px; }
.publication-list { border-top: 1px solid var(--ink); }
.publication-item { display: grid; grid-template-columns: 80px 1fr 30px; gap: 24px; align-items: start; padding: 26px 8px; border-bottom: 1px solid var(--line); transition: background 180ms ease, padding 180ms ease; }
.publication-item:hover { padding-right: 16px; padding-left: 16px; background: rgba(232,238,245,.42); }
.pub-year { padding-top: 2px; color: var(--rust); font-family: var(--serif); font-size: 20px; }
.pub-content { display: flex; flex-direction: column; gap: 7px; }
.pub-content strong { max-width: 900px; font-family: var(--serif); font-size: clamp(19px, 2vw, 25px); font-weight: 400; line-height: 1.25; }
.pub-content small { color: var(--muted); font-size: 12px; }
.pub-arrow { justify-self: end; font-size: 18px; transition: transform 180ms ease; }
.publication-item:hover .pub-arrow { transform: translate(3px, -3px); }

.teaching-layout { display: grid; grid-template-columns: .85fr 1fr; gap: clamp(70px, 10vw, 150px); }
.teaching-copy { max-width: 600px; color: var(--muted); font-size: 17px; }
.course-list { margin: 50px 0 0; padding: 0; border-top: 1px solid var(--line); list-style: none; }
.course-list li { display: flex; gap: 20px; padding: 14px 0; border-bottom: 1px solid var(--line); color: var(--ink); font-size: 14px; }
.course-list span { color: var(--rust); font-size: 10px; }
.contact { width: 100%; max-width: none; padding: 115px max(40px, calc((100vw - 1180px) / 2)); border: 0; background: var(--navy); color: var(--white); }
.contact-inner { width: 100%; max-width: 1180px; margin: auto; }
.contact .kicker { color: #dca48b; }
.contact h2 { max-width: 980px; }
.contact-row { display: flex; align-items: end; justify-content: space-between; gap: 40px; margin-top: 70px; padding-top: 32px; border-top: 1px solid rgba(255,255,255,.2); }
.button-light { background: var(--white); color: var(--navy); }
.contact-links { display: flex; gap: 28px; font-size: 13px; }
.contact-links a { color: rgba(255,255,255,.72); }
.contact-links a:hover { color: var(--white); }
.site-footer { display: flex; justify-content: space-between; gap: 20px; padding: 28px max(40px, calc((100vw - 1180px) / 2)); background: var(--navy); color: rgba(255,255,255,.58); font-size: 11px; letter-spacing: .05em; text-transform: uppercase; }
.site-footer p { margin: 0; }
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 700ms cubic-bezier(.2,.7,.2,1), transform 700ms cubic-bezier(.2,.7,.2,1); }
.reveal[data-delay="1"] { transition-delay: 100ms; }
.reveal[data-delay="2"] { transition-delay: 200ms; }
.reveal.visible { opacity: 1; transform: translateY(0); }

@media (max-width: 980px) {
  :root { --page: min(100% - 48px, 760px); }
  .site-header { padding: 0 24px; }
  .hero { grid-template-columns: 1fr; gap: 45px; padding-top: 145px; }
  .hero-visual { min-height: 590px; }
  .portrait-frame { right: 9%; }
  .formula-card { left: 8%; }
  .intro { grid-template-columns: 1fr; gap: 45px; }
  .intro .section-label { margin: 0; }
  .intro-columns { margin-left: 0; }
  .impact-grid { margin-left: 0; }
  .research-grid { grid-template-columns: 1fr; }
  .research-card { min-height: 400px; }
  .research-symbol { max-width: 360px; }
  .teaching-layout { grid-template-columns: 1fr; gap: 50px; }
  .background-layout { grid-template-columns: 1fr; gap: 20px; }
}
@media (max-width: 720px) {
  :root { --page: calc(100% - 36px); }
  .site-header { height: 70px; padding: 0 18px; }
  .wordmark-mark { width: 32px; height: 32px; }
  .menu-button { display: block; z-index: 2; }
  .menu-button[aria-expanded="true"] > span:first-child { transform: translateY(3.5px) rotate(45deg); }
  .menu-button[aria-expanded="true"] > span:nth-child(2) { transform: translateY(-3.5px) rotate(-45deg); }
  .site-nav { position: fixed; inset: 0; display: flex; visibility: hidden; padding: 110px 28px 40px; background: var(--paper); pointer-events: none; flex-direction: column; align-items: flex-start; gap: 20px; font-family: var(--serif); font-size: 36px; transform: translateX(100%); transition: transform 280ms cubic-bezier(.2,.7,.2,1), visibility 0s linear 280ms; }
  .site-nav.open { visibility: visible; pointer-events: auto; transform: translateX(0); transition-delay: 0s; }
  .nav-contact { padding: 0; border: 0; }
  .hero { min-height: auto; padding: 120px 0 80px; }
  h1 { font-size: clamp(50px, 14vw, 68px); }
  .hero-actions { align-items: flex-start; flex-direction: column; }
  .hero-visual { min-height: 480px; }
  .portrait-frame { right: 2%; width: 88%; }
  .portrait-frame img { height: 385px; }
  .orbit-one { right: 40px; width: 280px; height: 280px; }
  .formula-card { bottom: 0; left: 0; width: 190px; }
  .section { padding: 90px 0; }
  .section-label { margin-bottom: 50px; }
  .intro-columns { grid-template-columns: 1fr; gap: 10px; }
  .impact-grid { grid-template-columns: 1fr 1fr; }
  .impact-grid div:nth-child(2) { border-right: 0; }
  .impact-grid div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .impact-grid div:first-child, .impact-grid div:nth-child(3) { padding-left: 0; }
  .research-card { min-height: 430px; }
  .timeline article { grid-template-columns: 82px 1fr; gap: 16px; }
  .publication-heading { align-items: flex-start; flex-direction: column; }
  .publication-links { flex-wrap: wrap; }
  .publication-item { grid-template-columns: 54px 1fr 20px; gap: 12px; padding: 22px 2px; }
  .publication-item:hover { padding-right: 4px; padding-left: 4px; }
  .contact { padding: 90px 18px; }
  .contact-row { align-items: flex-start; flex-direction: column; }
  .contact-links { flex-wrap: wrap; }
  .site-footer { padding: 24px 18px; flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}