:root {
  color-scheme: light;
  --paper: #f6f5ef;
  --paper-strong: #eeece2;
  --ink: #172421;
  --muted: #61706a;
  --line: #d6dbd2;
  --accent: #087e72;
  --accent-strong: #075b54;
  --highlight: #d8e9d8;
  --warm: #d8754e;
  --serif: 'Newsreader', Georgia, serif;
  --sans: 'Manrope', Arial, sans-serif;
  --mono: 'DM Mono', Consolas, monospace;
  --shadow: 0 24px 60px rgba(27, 48, 41, 0.1);
}

html[data-theme='dark'] {
  color-scheme: dark;
  --paper: #14201d;
  --paper-strong: #1b2b26;
  --ink: #eff3e9;
  --muted: #adbbb1;
  --line: #31423b;
  --accent: #67d3bd;
  --accent-strong: #9ae4d1;
  --highlight: #233d35;
  --warm: #f09b75;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.25);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); line-height: 1.6; }
a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
::selection { background: var(--accent); color: var(--paper); }

.skip-link { position: fixed; left: 1rem; top: -4rem; z-index: 20; padding: .7rem 1rem; background: var(--ink); color: var(--paper); }
.skip-link:focus { top: 1rem; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.section-wrap { width: min(1180px, calc(100% - 4rem)); margin-inline: auto; }

.site-header { position: sticky; top: 0; z-index: 10; background: var(--paper); border-bottom: 1px solid var(--line); -webkit-backdrop-filter: blur(18px); backdrop-filter: blur(18px); }
.nav-shell { width: min(1280px, calc(100% - 4rem)); min-height: 76px; margin-inline: auto; display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.brand { font-family: var(--mono); font-size: .72rem; letter-spacing: .08em; text-decoration: none; text-transform: uppercase; white-space: nowrap; }
.brand span { display: inline-grid; place-items: center; width: 25px; height: 25px; margin-right: .45rem; background: var(--accent); color: var(--paper); font-family: var(--sans); font-weight: 800; }
.nav-menu { display: flex; align-items: center; gap: 1.35rem; }
.nav-menu a { color: var(--muted); font-size: .72rem; font-weight: 700; text-decoration: none; text-transform: uppercase; letter-spacing: .06em; transition: color .2s; }
.nav-menu a:hover, .nav-menu a:focus-visible, .nav-menu a.is-active { color: var(--accent); }
.nav-menu a.is-active { border-bottom: 2px solid var(--accent); padding-bottom: 2px; }
.theme-toggle, .menu-toggle { border: 1px solid var(--line); background: transparent; color: var(--ink); cursor: pointer; }
.theme-toggle { width: 36px; height: 36px; display: grid; place-items: center; font-size: 1.1rem; }
.theme-toggle:hover, .theme-toggle:focus-visible { border-color: var(--accent); color: var(--accent); }
.menu-toggle { display: none; width: 40px; height: 40px; }

.hero { min-height: calc(100vh - 76px); padding-top: clamp(5rem, 12vw, 9rem); padding-bottom: 2rem; display: flex; flex-direction: column; justify-content: space-between; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(300px, .9fr); align-items: center; gap: clamp(3rem, 10vw, 9rem); }
.eyebrow, .section-label, .hero-meta, .contribution-header span, .site-footer { font-family: var(--mono); text-transform: uppercase; letter-spacing: .1em; font-size: .66rem; }
.eyebrow { color: var(--accent); font-weight: 500; }
h1, h2 { margin: 0; font-weight: 500; line-height: .96; letter-spacing: -.04em; }
h1 { max-width: 820px; margin-top: 1.4rem; font-size: clamp(3.5rem, 8vw, 7.8rem); }
h2 { font-size: clamp(2.8rem, 5vw, 5.4rem); }
h1 em, h2 em, .contact-content em { color: var(--accent); font-family: var(--serif); font-style: italic; font-weight: 500; }
.hero-lede { max-width: 590px; margin: 2.2rem 0 2rem; color: var(--muted); font-size: clamp(1rem, 1.5vw, 1.2rem); line-height: 1.8; }
.hero-actions, .contact-actions, .link-row { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem; }
.button { display: inline-flex; align-items: center; gap: .8rem; min-height: 48px; padding: .8rem 1.15rem; border: 1px solid var(--accent); font-size: .72rem; font-weight: 800; letter-spacing: .06em; text-decoration: none; text-transform: uppercase; transition: transform .2s, background .2s, color .2s; }
.button:hover, .button:focus-visible { transform: translateY(-2px); }
.button-primary { background: var(--accent); color: var(--paper); }
.button-primary:hover, .button-primary:focus-visible { background: var(--accent-strong); }
.button-quiet { border-color: var(--line); color: var(--ink); }
.text-link { color: var(--accent); font-family: var(--mono); font-size: .7rem; text-decoration: none; text-transform: uppercase; letter-spacing: .06em; }
.text-link:hover, .text-link:focus-visible { color: var(--accent-strong); text-decoration: underline; text-underline-offset: .3em; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 1rem 2rem; margin-top: 3.4rem; color: var(--muted); }
.hero-meta span:first-child::before { content: '●'; margin-right: .55rem; color: var(--warm); }
.hero-portrait { justify-self: end; width: min(100%, 420px); }
.portrait-frame { position: relative; padding: 1.2rem 1.2rem 0 0; }
.portrait-frame::before { content: ''; position: absolute; inset: 0 0 1.2rem 1.2rem; border: 1px solid var(--accent); }
.portrait-frame::after { content: ''; position: absolute; right: -1rem; bottom: 2rem; width: 4rem; height: 4rem; border-right: 1px solid var(--warm); border-bottom: 1px solid var(--warm); }
.portrait-frame img { position: relative; z-index: 1; display: block; width: 100%; aspect-ratio: 4 / 5; object-fit: cover; filter: saturate(.8); }
.portrait-note { display: flex; align-items: flex-start; gap: .65rem; margin-top: 1rem; color: var(--muted); font-family: var(--mono); font-size: .62rem; line-height: 1.6; text-transform: uppercase; letter-spacing: .08em; }
.portrait-note strong { color: var(--ink); font-weight: 500; }
.status-dot { width: 7px; height: 7px; margin-top: .35rem; border-radius: 50%; background: var(--warm); box-shadow: 0 0 0 4px color-mix(in srgb, var(--warm) 17%, transparent); }
.hero-ruler { display: flex; align-items: center; gap: 1rem; margin-top: clamp(4rem, 10vw, 8rem); padding-top: 1rem; border-top: 1px solid var(--line); color: var(--muted); font-family: var(--mono); font-size: .62rem; text-transform: uppercase; letter-spacing: .08em; }
.hero-ruler span:nth-child(2) { flex: 1; }
.hero-ruler span:first-child { color: var(--accent); }

.intro-band, .soft-band { background: var(--paper-strong); }
.intro-band { border-block: 1px solid var(--line); }
.intro-grid { display: grid; grid-template-columns: 160px 1fr; gap: clamp(2rem, 8vw, 8rem); padding-block: clamp(4rem, 9vw, 8rem); }
.section-label { display: flex; gap: .8rem; color: var(--muted); }
.section-label span:first-child { color: var(--accent); }
.intro-content h2 { max-width: 830px; font-size: clamp(2.5rem, 5vw, 5rem); }
.intro-content h2::first-line { color: var(--ink); }
.intro-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; max-width: 850px; margin: 2.5rem 0; color: var(--muted); }
.link-row a { color: var(--ink); font-family: var(--mono); font-size: .66rem; text-decoration: none; text-transform: uppercase; letter-spacing: .07em; }
.link-row a:hover, .link-row a:focus-visible { color: var(--accent); }
.metrics-section { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; padding-block: 2.5rem; border-bottom: 1px solid var(--line); }
.metric { display: flex; flex-direction: column; gap: .35rem; border-left: 1px solid var(--line); padding-left: 1rem; }
.metric strong { font-family: var(--serif); font-size: 2.8rem; font-weight: 500; line-height: 1; }
.metric span { color: var(--muted); font-family: var(--mono); font-size: .62rem; text-transform: uppercase; letter-spacing: .08em; }
.metric-note { justify-content: center; border-left: 0; padding-left: 0; color: var(--accent); }

.content-section { padding-block: clamp(5rem, 10vw, 9rem); }
.section-heading { display: grid; grid-template-columns: 160px 1fr; gap: clamp(2rem, 8vw, 8rem); margin-bottom: 4rem; }
.section-heading .eyebrow { margin: 0 0 1rem; }
.research-layout { display: grid; grid-template-columns: minmax(200px, .6fr) 1.4fr; gap: clamp(2rem, 8vw, 8rem); }
.research-intro { color: var(--muted); }
.research-intro .text-link { display: inline-block; margin-top: 1.5rem; }
.research-list, .timeline, .publication-list { border-top: 1px solid var(--line); }
.research-item { display: grid; grid-template-columns: 1fr auto; gap: 1.5rem; align-items: center; padding: 1.35rem 0; border-bottom: 1px solid var(--line); text-decoration: none; }
.research-item:hover .research-title { color: var(--accent); }
.research-title { font-family: var(--serif); font-size: 1.45rem; transition: color .2s; }
.research-meta { color: var(--muted); font-family: var(--mono); font-size: .61rem; text-transform: uppercase; letter-spacing: .08em; }
.research-status { color: var(--warm); font-family: var(--mono); font-size: .6rem; text-transform: uppercase; letter-spacing: .08em; }
.publication-block { display: grid; grid-template-columns: 160px 1fr; gap: clamp(2rem, 8vw, 8rem); margin-top: 6rem; }
.research-spotlight { display: grid; grid-template-columns: 1.2fr .8fr; gap: 3rem; margin-top: 4rem; padding: 2rem; border: 1px solid var(--accent); background: var(--highlight); }
.spotlight-copy h3 { max-width: 520px; margin: .8rem 0 1rem; font-family: var(--serif); font-size: clamp(2rem, 4vw, 3.6rem); font-weight: 500; line-height: 1; }
.spotlight-copy > p:not(.eyebrow) { max-width: 600px; margin: 0; color: var(--muted); }
.spotlight-copy .link-row { margin-top: 1.5rem; }
.spotlight-signals { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; align-content: end; }
.spotlight-signals div { display: flex; flex-direction: column; gap: .5rem; padding-top: 1rem; border-top: 1px solid var(--accent); }
.spotlight-signals strong { color: var(--accent-strong); font-family: var(--serif); font-size: clamp(1.8rem, 3vw, 2.8rem); font-weight: 500; line-height: 1; }
.spotlight-signals span { color: var(--muted); font-family: var(--mono); font-size: .6rem; text-transform: uppercase; letter-spacing: .06em; }
.publication-item { display: grid; grid-template-columns: 1fr auto; gap: 2rem; padding: 1.5rem 0; border-bottom: 1px solid var(--line); }
.publication-title { font-family: var(--serif); font-size: 1.5rem; margin: 0; font-weight: normal; line-height: 1.25; }
.publication-title a { color: var(--ink); text-decoration: none; transition: color .2s; }
.publication-title a:hover, .publication-title a:focus-visible { color: var(--accent); }
.publication-meta { margin-top: .35rem; color: var(--muted); font-family: var(--mono); font-size: .62rem; text-transform: uppercase; letter-spacing: .06em; }
.publication-doi a { color: var(--warm); text-decoration: none; }
.publication-doi a:hover, .publication-doi a:focus-visible { color: var(--accent); text-decoration: underline; }
.publication-links { margin-top: .85rem; }
.publication-profiles { margin-bottom: 1.5rem; }
.hero-compact { padding-top: clamp(4rem, 8vw, 7rem); padding-bottom: 3rem; border-bottom: 1px solid var(--line); }
.hero-compact h1 { font-family: var(--serif); font-size: clamp(2.5rem, 6vw, 4.8rem); line-height: 1.05; margin: 1rem 0; font-weight: 500; }
.hero-compact h1 em { font-style: italic; color: var(--accent); }
.hero-compact .hero-lede { max-width: 720px; font-size: clamp(1.05rem, 2vw, 1.25rem); color: var(--muted); margin-bottom: 2rem; }
.empty-state { padding: clamp(2.5rem, 5vw, 4rem) 2rem; border: 1px dashed var(--line); background: var(--highlight); margin-top: 1.5rem; }
.empty-title { font-family: var(--serif); font-size: clamp(1.5rem, 3vw, 2rem); margin: 0 0 .6rem; color: var(--ink); font-weight: 500; }
.empty-desc { max-width: 640px; margin: 0 0 1.5rem; color: var(--muted); font-size: .95rem; line-height: 1.6; }
.empty-links { display: flex; flex-wrap: wrap; gap: 1.25rem; }

.timeline-item { display: grid; grid-template-columns: 180px 1fr; gap: 3rem; padding: 2rem 0; border-bottom: 1px solid var(--line); }
.timeline-date { color: var(--accent); font-family: var(--mono); font-size: .67rem; text-transform: uppercase; letter-spacing: .08em; }
.timeline-role { font-family: var(--serif); font-size: 1.8rem; }
.timeline-org { color: var(--warm); font-size: .75rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.timeline-description { max-width: 700px; margin: .85rem 0; color: var(--muted); }
.tag-list { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1rem; }
.tag { padding: .35rem .55rem; border: 1px solid var(--line); color: var(--muted); font-family: var(--mono); font-size: .6rem; text-transform: uppercase; letter-spacing: .06em; }

.contribution-header { display: flex; justify-content: space-between; gap: 2rem; margin-bottom: 2rem; color: var(--muted); }
.contribution-header p { max-width: 500px; margin: 0; }
.contribution-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.directory-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
@media (max-width: 1000px) and (min-width: 801px) { .directory-grid { grid-template-columns: repeat(2, 1fr); } }
.contribution-card { min-height: 230px; padding: 1.5rem; background: var(--paper); text-decoration: none; transition: background .2s; }
.contribution-card:hover, .contribution-card:focus-visible { background: var(--highlight); }
.card-kicker { color: var(--accent); font-family: var(--mono); font-size: .65rem; text-transform: uppercase; letter-spacing: .08em; }
.contribution-card h3 { margin: 2.4rem 0 .7rem; font-family: var(--serif); font-size: 1.65rem; font-weight: 500; }
.contribution-card p { margin: 0; color: var(--muted); font-size: .9rem; }
.card-footer { display: flex; justify-content: space-between; gap: 1rem; margin-top: 2rem; color: var(--muted); font-family: var(--mono); font-size: .6rem; text-transform: uppercase; letter-spacing: .06em; }
.card-footer strong { color: var(--accent); font-weight: 500; }

.project-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.project-card { min-height: 270px; padding: 1.7rem; background: var(--paper-strong); text-decoration: none; transition: background .2s, transform .2s; }
.project-card:hover, .project-card:focus-visible { background: var(--highlight); }
.project-card-featured { min-height: 330px; }
.project-card-top { display: flex; justify-content: space-between; gap: 1rem; }
.project-number { color: var(--warm); font-family: var(--mono); font-size: .68rem; }
.project-status { color: var(--accent); font-family: var(--mono); font-size: .6rem; text-transform: uppercase; letter-spacing: .06em; text-align: right; }
.project-card h3 { max-width: 450px; margin: 3rem 0 .8rem; font-family: var(--serif); font-size: 2rem; font-weight: 500; }
.project-card p { max-width: 500px; margin: 0; color: var(--muted); font-size: .9rem; }
.work-intro { display: flex; justify-content: space-between; gap: 2rem; margin: -1.5rem 0 2rem 160px; color: var(--muted); }
.work-intro p { max-width: 560px; margin: 0; }

.education-layout { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(3rem, 8vw, 8rem); }
.education-item { padding: 1.2rem 0; border-bottom: 1px solid var(--line); }
.education-degree { font-family: var(--serif); font-size: 1.45rem; }
.education-meta { margin-top: .35rem; color: var(--muted); font-family: var(--mono); font-size: .62rem; text-transform: uppercase; letter-spacing: .06em; }
.skill-group { margin-bottom: 2rem; }
.skill-group h3 { margin: 0 0 .75rem; color: var(--accent); font-family: var(--mono); font-size: .65rem; font-weight: 500; text-transform: uppercase; letter-spacing: .1em; }
.skill-group p { margin: 0; font-family: var(--serif); font-size: 1.5rem; }

.contact-band { background: var(--accent); color: var(--paper); }
.contact-content { padding-block: clamp(5rem, 11vw, 10rem); }
.contact-content .eyebrow { color: var(--paper); }
.contact-content h2 { max-width: 780px; margin: 1.3rem 0 2.5rem; }
.contact-content h2 em { color: var(--paper); }
.contact-content .button-primary { background: var(--paper); border-color: var(--paper); color: var(--accent-strong); }
.contact-content .button-quiet { border-color: var(--paper); color: var(--paper); opacity: .85; }
.site-footer { color: var(--muted); }
.footer-inner { display: flex; justify-content: space-between; gap: 1rem; padding-block: 1.5rem; }
.loading-state { color: var(--muted); font-family: var(--mono); font-size: .7rem; text-transform: uppercase; }
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; }
.reveal.is-visible { opacity: 1; transform: none; }
:focus-visible { outline: 2px solid var(--warm); outline-offset: 4px; }

@media (max-width: 800px) {
  .section-wrap, .nav-shell { width: min(100% - 2rem, 600px); }
  .nav-shell { min-height: 64px; }
  .menu-toggle { display: block; }
  .nav-menu { position: absolute; top: 64px; left: 0; right: 0; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: .75rem 1rem 1rem; background: var(--paper); border-bottom: 1px solid var(--line); }
  .nav-menu.is-open { display: flex; }
  .nav-menu a { padding: .75rem 0; border-bottom: 1px solid var(--line); }
  .theme-toggle { margin-top: .75rem; align-self: flex-start; }
  .hero { padding-top: 4rem; }
  .hero-grid, .research-layout, .intro-columns, .education-layout { grid-template-columns: 1fr; }
  .hero-portrait { justify-self: start; width: min(100%, 360px); }
  .hero-ruler span:nth-child(2) { display: none; }
  .hero-ruler { justify-content: space-between; }
  .intro-grid, .section-heading, .publication-block { grid-template-columns: 1fr; gap: 1.5rem; }
  .metrics-section { grid-template-columns: repeat(2, 1fr); }
  .metric-note { grid-column: span 2; border-left: 1px solid var(--line); padding-left: 1rem; }
  .contribution-grid, .project-grid, .directory-grid { grid-template-columns: 1fr; }
  .contribution-header { display: block; }
  .contribution-header span { display: block; margin-top: 1rem; }
  .timeline-item { grid-template-columns: 1fr; gap: .55rem; }
  .publication-item, .research-item { grid-template-columns: 1fr; gap: .7rem; }
  .research-spotlight { grid-template-columns: 1fr; gap: 2rem; }
  .spotlight-signals { grid-template-columns: 1fr 1fr 1fr; }
  .research-status { justify-self: start; }
  .footer-inner { flex-direction: column; }
  .work-intro { display: block; margin: -1.5rem 0 2rem; }
  .work-intro .text-link { display: inline-block; margin-top: 1rem; }
}

@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; }
}