:root{
  color-scheme: light dark;
  --bg:#ffffff;
  --bg-alt:#f2f1ee;
  --card-bg:#ffffff;
  --ink:#0a0a0b;
  --ink-soft:#4a4844;
  --accent:#b91c1c;
  --accent-contrast:#ffffff;
  --accent-soft:rgba(185,28,28,0.1);
  --gold:#9a6b1f;
  --line:rgba(10,10,11,0.14);
  --invert-bg:#0a0a0b;
  --invert-ink:#f5f3ef;
  --invert-ink-soft:rgba(245,243,239,0.68);
  --invert-line:rgba(245,243,239,0.18);
  --serif: 'Iowan Old Style','Palatino Linotype',Palatino,Georgia,'Times New Roman',serif;
  --sans: -apple-system,BlinkMacSystemFont,'Segoe UI',Inter,Helvetica,Arial,sans-serif;
}

@media (prefers-color-scheme: dark){
  :root:not([data-theme]){
    --bg:#0a0a0b;
    --bg-alt:#141416;
    --card-bg:#151517;
    --ink:#f5f3ef;
    --ink-soft:#b3b0a9;
    --accent:#ff6b5b;
    --accent-contrast:#0a0a0b;
    --accent-soft:rgba(255,107,91,0.14);
    --gold:#d9ad5c;
    --line:rgba(245,243,239,0.16);
    --invert-bg:#f5f3ef;
    --invert-ink:#0a0a0b;
    --invert-ink-soft:rgba(10,10,11,0.65);
    --invert-line:rgba(10,10,11,0.14);
  }
}
:root[data-theme="dark"]{
  --bg:#0a0a0b;
  --bg-alt:#141416;
  --card-bg:#151517;
  --ink:#f5f3ef;
  --ink-soft:#b3b0a9;
  --accent:#ff6b5b;
  --accent-contrast:#0a0a0b;
  --accent-soft:rgba(255,107,91,0.14);
  --gold:#d9ad5c;
  --line:rgba(245,243,239,0.16);
  --invert-bg:#f5f3ef;
  --invert-ink:#0a0a0b;
  --invert-ink-soft:rgba(10,10,11,0.65);
  --invert-line:rgba(10,10,11,0.14);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--sans);
  background:var(--bg);
  color:var(--ink);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;}
.container{max-width:1180px;margin:0 auto;padding:0 32px;}

.skip-link{position:absolute;left:-999px;top:0;background:var(--accent);color:var(--accent-contrast);padding:12px 18px;z-index:200;font-weight:700;}
.skip-link:focus{left:16px;top:16px;}

a:focus-visible,button:focus-visible,.nav-toggle:focus-visible{
  outline:3px solid var(--accent);outline-offset:3px;border-radius:2px;
}

/* Nav */
.site-nav{
  position:sticky;top:0;z-index:100;
  background:color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.nav-inner{max-width:1180px;margin:0 auto;padding:20px 32px;display:flex;align-items:center;justify-content:space-between;}
.nav-brand{font-size:19px;font-weight:800;letter-spacing:-0.01em;text-decoration:none;color:var(--ink);}
.nav-links{list-style:none;display:flex;gap:30px;margin:0;padding:0;align-items:center;}
.nav-links a{text-decoration:none;font-size:14px;font-weight:700;color:var(--ink-soft);letter-spacing:.01em;transition:color .2s;}
.nav-links a:hover{color:var(--accent);}
.nav-links .nav-cta{background:var(--accent);color:var(--accent-contrast);padding:10px 20px;border-radius:999px;}
.nav-links .nav-cta:hover{opacity:.88;color:var(--accent-contrast);}
.theme-toggle{
  display:flex;align-items:center;justify-content:center;
  width:38px;height:38px;border-radius:50%;
  border:1px solid var(--line);background:none;cursor:pointer;color:var(--ink);
  flex-shrink:0;
}
.theme-toggle:hover{border-color:var(--accent);color:var(--accent);}
.theme-toggle svg{width:18px;height:18px;}
.theme-toggle .icon-moon{display:none;}
:root[data-theme="dark"] .theme-toggle .icon-sun{display:none;}
:root[data-theme="dark"] .theme-toggle .icon-moon{display:block;}
@media (prefers-color-scheme: dark){
  :root:not([data-theme]) .theme-toggle .icon-sun{display:none;}
  :root:not([data-theme]) .theme-toggle .icon-moon{display:block;}
}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px;}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{content:"";display:block;width:22px;height:2px;background:var(--ink);position:relative;transition:.2s;}
.nav-toggle span::before{position:absolute;top:-7px;}
.nav-toggle span::after{position:absolute;top:7px;}

/* Hero */
.hero{padding:120px 0 90px;overflow:hidden;}
.hero-inner{max-width:900px;}
.eyebrow{font-size:14px;font-weight:800;text-transform:uppercase;letter-spacing:.1em;color:var(--accent);margin:0 0 22px;}
.hero h1{font-size:clamp(48px,8vw,104px);line-height:0.96;margin:0 0 30px;font-weight:800;letter-spacing:-0.04em;}
.hero h1 .hl{color:var(--accent);}
.hero-lede{font-size:20px;line-height:1.55;color:var(--ink-soft);max-width:56ch;margin:0 0 36px;}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:52px;}
.btn{display:inline-flex;align-items:center;gap:8px;padding:15px 28px;border-radius:999px;text-decoration:none;font-size:15px;font-weight:800;transition:.2s;border:2px solid transparent;}
.btn-primary{background:var(--accent);color:var(--accent-contrast);}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 24px -8px var(--accent-soft);}
.btn-ghost{border-color:var(--ink);color:var(--ink);}
.btn-ghost:hover{background:var(--ink);color:var(--bg);}
.hero-marks{display:flex;align-items:center;gap:14px;flex-wrap:wrap;}
.hero-marks .mark-chip{
  display:flex;align-items:center;justify-content:center;
  padding:12px 18px;border-radius:14px;
  background:var(--card-bg);border:1px solid var(--line);
  box-shadow:0 10px 24px -12px rgba(0,0,0,.3);
  transition:transform .2s, box-shadow .2s, border-color .2s;
}
.hero-marks .mark-chip:hover{transform:translateY(-4px) scale(1.03);box-shadow:0 16px 32px -12px rgba(0,0,0,.4);border-color:var(--accent);}
.hero-marks img{height:26px;width:auto;}

.portrait-frame{
  border-radius:4px;
  overflow:hidden;
  background:var(--ink);
  position:relative;
  border:3px solid var(--ink);
  max-width:340px;
  box-shadow:0 24px 48px -20px rgba(0,0,0,.4);
}
.portrait-frame::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(155deg, color-mix(in srgb, var(--accent) 38%, transparent), transparent 55%);
  mix-blend-mode:multiply;
}
.portrait-frame img{width:100%;height:auto;display:block;filter:grayscale(1) contrast(1.12);}
.portrait-caption{font-size:13px;font-weight:700;color:var(--ink-soft);margin:14px 4px 0;text-transform:uppercase;letter-spacing:.06em;}

/* Sections */
.section{padding:100px 0;}
.section-alt{background:var(--bg-alt);}
.tag-label{font-size:12.5px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin:0 0 14px;}
.section-head h2,.about-side h2{font-size:clamp(32px,4.4vw,52px);line-height:1.05;margin:0 0 16px;font-weight:800;letter-spacing:-0.02em;}
.section-sub{font-size:17px;color:var(--ink-soft);max-width:60ch;margin:0;}

.about-grid{display:grid;grid-template-columns:0.8fr 1.2fr;gap:64px;}
.about-side{display:flex;flex-direction:column;align-items:flex-start;}
.about-side .portrait-frame{margin-top:28px;}
.about-body .lede{font-size:21px;line-height:1.55;font-weight:600;color:var(--ink);margin-top:0;}
.about-body p{font-size:16.5px;line-height:1.75;color:var(--ink-soft);}
.about-body em{color:var(--ink);font-style:normal;font-weight:700;}
.about-body a{color:var(--accent);font-weight:700;text-decoration:underline;text-underline-offset:3px;}
.degree-list{margin-top:36px;padding-top:28px;border-top:2px solid var(--ink);}
.degree-row{display:flex;align-items:baseline;justify-content:space-between;gap:16px;padding:14px 0;border-bottom:1px solid var(--line);flex-wrap:wrap;}
.degree-row:last-child{border-bottom:none;}
.degree-name{font-size:17px;font-weight:800;color:var(--ink);flex:0 0 auto;}
.degree-hon{font-size:13px;font-weight:700;color:var(--accent);flex:1;margin-left:10px;text-transform:uppercase;letter-spacing:.04em;}
.degree-year{font-size:13px;color:var(--ink-soft);white-space:nowrap;font-weight:600;}

/* Publications */
.pub-list{display:flex;flex-direction:column;margin-top:48px;}
.pub{display:grid;grid-template-columns:110px 1fr;gap:32px;padding:36px 0;border-top:1px solid var(--line);}
.pub:last-child{border-bottom:1px solid var(--line);}
.pub-year{font-size:28px;color:var(--accent);font-weight:800;letter-spacing:-.01em;}
.pub-year-text{font-size:13px;font-weight:800;line-height:1.4;letter-spacing:.04em;text-transform:uppercase;}
.pub-body h3{font-size:25px;margin:0 0 8px;font-weight:800;line-height:1.2;letter-spacing:-0.01em;}
.pub-sub{color:var(--ink-soft);font-size:15px;margin:0 0 14px;font-weight:600;}
.pub-body p{font-size:15.5px;line-height:1.7;color:var(--ink-soft);margin:0 0 16px;max-width:65ch;}
.chip{display:inline-block;font-size:12.5px;font-weight:700;color:var(--ink);background:var(--bg-alt);border:1px solid var(--line);padding:6px 13px;border-radius:999px;}
.chip-row{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px;}

.journal-strip{margin-top:64px;display:flex;align-items:center;gap:32px;background:var(--card-bg);border:2px solid var(--ink);border-radius:16px;padding:28px 32px;}
.journal-strip img{width:72px;height:auto;border-radius:4px;flex-shrink:0;}
.journal-strip p{margin:4px 0 0;font-size:15.5px;color:var(--ink-soft);line-height:1.6;}
.journal-strip em{color:var(--ink);font-style:normal;font-weight:700;}

/* Impact bento */
.bento-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:48px;}
.bento-card{background:var(--card-bg);border:1px solid var(--line);border-radius:16px;padding:32px;transition:transform .2s, border-color .2s;}
.bento-card:hover{transform:translateY(-4px);border-color:var(--accent);}
.bento-card h3{font-size:22px;margin:0 0 16px;font-weight:800;}
.bento-card p{font-size:15px;line-height:1.7;color:var(--ink-soft);margin:0 0 12px;}
.bento-card strong{color:var(--ink);}
.impact-meta{font-size:12.5px;color:var(--ink-soft);margin-top:18px;padding-top:16px;border-top:1px dashed var(--line);}

.stat-panel{margin-top:28px;background:var(--invert-bg);border-radius:20px;padding:48px 40px;}
.stat-panel .tag-label{color:var(--accent);margin-bottom:24px;}
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:32px;}
.stat{display:flex;flex-direction:column;gap:8px;}
.stat-num{font-size:52px;font-weight:800;color:var(--invert-ink);line-height:1;letter-spacing:-0.02em;}
.stat-num small{font-size:18px;font-weight:800;color:var(--accent);margin-left:2px;}
.stat-label{font-size:13.5px;color:var(--invert-ink-soft);line-height:1.5;max-width:22ch;font-weight:600;}
.stat-footnote{font-size:13px;color:var(--invert-ink-soft);margin:32px 0 0;padding-top:20px;border-top:1px solid var(--invert-line);line-height:1.6;}

/* Affiliations */
.affil-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:48px;}
.affil-logo{background:var(--card-bg);border:1px solid var(--line);border-radius:14px;padding:28px 20px;display:flex;flex-direction:column;align-items:center;gap:16px;text-align:center;box-shadow:0 10px 24px -16px rgba(0,0,0,.35);transition:transform .25s, box-shadow .25s, border-color .25s;text-decoration:none;}
.affil-logo:hover{border-color:var(--accent);transform:translateY(-7px) scale(1.03);box-shadow:0 26px 44px -18px rgba(0,0,0,.45);}
.affil-logo img{height:44px;width:auto;object-fit:contain;filter:drop-shadow(0 6px 10px rgba(0,0,0,.22));}
@media (prefers-color-scheme: dark){:root:not([data-theme]) .affil-logo img{filter:brightness(1.15);}}
:root[data-theme="dark"] .affil-logo img{filter:brightness(1.15);}
.affil-logo span{font-size:13px;font-weight:700;color:var(--ink-soft);}

.rc-row{margin-top:72px;padding-top:56px;border-top:1px solid var(--line);}
.rc-heading{font-size:clamp(26px,3vw,36px);font-weight:800;margin:2px 0 32px;letter-spacing:-0.01em;}
.rc-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;}
.rc-card{
  background:var(--card-bg);border:1px solid var(--line);border-radius:14px;
  padding:22px 18px;display:flex;flex-direction:column;align-items:flex-start;gap:16px;
  box-shadow:0 10px 24px -16px rgba(0,0,0,.35);
  transition:transform .25s, box-shadow .25s, border-color .25s;
  text-decoration:none;
}
.rc-card:hover{transform:translateY(-7px) scale(1.03);border-color:var(--accent);box-shadow:0 26px 44px -18px rgba(0,0,0,.45);}
.rc-card img{height:52px;width:52px;border-radius:50%;flex-shrink:0;box-shadow:0 10px 18px -6px rgba(0,0,0,.4);}
.rc-card > div{display:flex;flex-direction:column;gap:4px;}
.rc-code{font-size:17px;font-weight:800;color:var(--accent);}
.rc-name{font-size:12.5px;line-height:1.4;color:var(--ink-soft);font-weight:600;}

/* Hire */
.flagship-card{
  margin-top:48px;background:var(--card-bg);border:2px solid var(--accent);border-radius:20px;
  padding:36px 40px;display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;
}
.flagship-text .tag-label{margin-bottom:10px;}
.flagship-text h3{font-size:25px;font-weight:800;margin:0 0 12px;letter-spacing:-0.01em;}
.flagship-text p{font-size:15px;line-height:1.7;color:var(--ink-soft);margin:0 0 18px;max-width:62ch;}
.flagship-card .btn{flex-shrink:0;}
.hire-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px;margin-top:28px;}
.hire-grid-single{grid-template-columns:1fr;}
.hire-card{background:var(--card-bg);border:1px solid var(--line);border-radius:20px;padding:40px;display:flex;flex-direction:column;}
.hire-card h3{font-size:27px;margin:6px 0 16px;font-weight:800;letter-spacing:-0.01em;}
.hire-card > p{font-size:15.5px;line-height:1.7;color:var(--ink-soft);margin:0 0 24px;max-width:75ch;}
.hire-card-cohere{background:var(--invert-bg);border-color:var(--invert-bg);}
.hire-card-cohere h3{color:var(--invert-ink);}
.hire-card-cohere > p{color:var(--invert-ink-soft);}
.hire-card-cohere .tag-label{color:var(--accent);}
.hire-expertise{display:flex;flex-direction:column;gap:14px;margin-bottom:28px;padding-top:20px;border-top:1px dashed var(--line);flex:1;}
.hire-expertise-row{flex-direction:row;flex-wrap:wrap;gap:32px;}
.hire-expertise-row > div{flex:1 1 200px;}
.hire-card-cohere .hire-expertise{border-top-color:var(--invert-line);}
.hire-expertise div{font-size:14px;line-height:1.6;color:var(--ink-soft);}
.hire-card-cohere .hire-expertise div{color:var(--invert-ink-soft);}
.hire-expertise-label{display:block;font-size:11.5px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);margin-bottom:4px;}
.btn-ghost-dark{border:2px solid var(--invert-line);color:var(--invert-ink);align-self:flex-start;}
.btn-ghost-dark:hover{background:var(--invert-ink);color:var(--invert-bg);}
.hire-card .btn-primary{align-self:flex-start;}

/* Contact */
.contact-section{background:var(--invert-bg);}
.contact-grid{display:grid;grid-template-columns:1.2fr 0.8fr;gap:48px;align-items:center;padding:16px 0;}
.contact-section .tag-label{color:var(--accent);}
.contact-section h2{font-size:clamp(32px,4.4vw,52px);line-height:1.05;margin:0 0 16px;font-weight:800;color:var(--invert-ink);letter-spacing:-0.02em;}
.contact-section .section-sub{color:var(--invert-ink-soft);}
.contact-section a:not(.btn){color:var(--accent);text-decoration:underline;text-underline-offset:3px;}
.contact-section .btn-primary{margin-top:28px;}
.social-links{display:flex;flex-direction:column;gap:2px;}
.social-link{display:flex;align-items:center;gap:16px;padding:16px 4px;border-bottom:1px solid var(--invert-line);text-decoration:none;color:var(--invert-ink);font-weight:700;transition:.2s;}
.social-link:hover{padding-left:10px;color:var(--accent);}
.social-link .icon-badge{
  height:38px;width:38px;flex-shrink:0;
  border-radius:50%;
  display:flex;align-items:center;justify-content:center;
}
.social-link .icon-badge img{height:18px;width:18px;object-fit:contain;filter:brightness(0) invert(1);}
.social-link.li-linkedin .icon-badge{background:#0A66C2;}
.social-link.li-researchgate .icon-badge{background:#00857D;}
.social-link.li-orcid .icon-badge{background:#A6CE39;}
.social-link.li-x .icon-badge{background:#111;}
.social-link.li-scholar .icon-badge{background:#4285F4;}

/* Footer */
.site-footer{padding:28px 0;background:var(--invert-bg);border-top:1px solid var(--invert-line);}
.footer-inner{display:flex;justify-content:space-between;font-size:13px;color:var(--invert-ink-soft);}
.footer-inner a{color:var(--accent);text-decoration:none;font-weight:700;}

/* Reveal animation */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .7s ease, transform .7s ease;}
.reveal.in{opacity:1;transform:none;}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  .reveal{opacity:1!important;transform:none!important;transition:none!important;}
  .bento-card:hover,.rc-card:hover,.affil-logo:hover,.btn-primary:hover{transform:none;}
}

/* Responsive */
@media (max-width:900px){
  .about-grid{grid-template-columns:1fr;gap:32px;}
  .about-side .portrait-frame{max-width:280px;}
  .bento-grid{grid-template-columns:1fr;}
  .affil-grid{grid-template-columns:repeat(2,1fr);}
  .stat-grid{grid-template-columns:1fr 1fr;}
  .stat-panel{padding:32px 24px;}
  .hire-grid{grid-template-columns:1fr;}
  .hire-expertise-row{flex-direction:column;gap:14px;}
  .rc-grid{grid-template-columns:1fr 1fr;}
  .contact-grid{grid-template-columns:1fr;}
  .nav-links{
    position:fixed;top:65px;left:0;right:0;
    background:var(--bg);
    flex-direction:column;
    padding:24px 32px;
    gap:20px;
    border-bottom:1px solid var(--line);
    transform:translateY(-120%);
    transition:transform .25s;
  }
  .nav-links.open{transform:translateY(0);}
  .nav-toggle{display:block;}
}
@media (max-width:560px){
  .pub{grid-template-columns:1fr;gap:8px;}
  .affil-grid{grid-template-columns:1fr 1fr;}
  .rc-grid{grid-template-columns:1fr;}
}