:root{
  --paper: #EEF0E7;
  --paper-dim: #EDE4D2;
  --ink: #12242A;
  --ink-soft: #40555A;
  --teal: #1F5C57;
  --teal-deep: #0E3230;
  --coral: #D6491F;
  --gold: #C8912E;
  --sand: #C9A876;
  --line: rgba(18,36,42,0.14);
  --line-strong: rgba(18,36,42,0.28);
  --radius: 8px;
  --shadow: 0 2px 6px rgba(18,36,42,0.07), 0 10px 24px rgba(18,36,42,0.05);
  --max: 1140px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *{animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important;}
}

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:'IBM Plex Sans', ui-sans-serif, system-ui, sans-serif;
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3{
  font-family:'Newsreader', Georgia, serif;
  font-weight:500;
  color:var(--ink);
  margin:0;
  letter-spacing:-0.01em;
}

a{color:var(--teal); text-decoration:none;}
a:hover{color:var(--coral);}
a:focus-visible, button:focus-visible{outline:2px solid var(--coral); outline-offset:3px; border-radius:2px;}

.wrap{max-width:var(--max); margin:0 auto; padding:0 28px;}

.mono{font-family:'IBM Plex Mono', ui-monospace, monospace;}
.eyebrow{
  font-family:'IBM Plex Mono', monospace;
  font-size:12.5px;
  letter-spacing:0.08em;
  text-transform:uppercase;
  color:var(--teal);
  display:flex;
  align-items:center;
  gap:10px;
}
.eyebrow::before{
  content:'';
  width:7px;height:7px;border-radius:50%;
  background:var(--coral);
  flex:none;
}

/* ---------- NAV ---------- */
header.site{
  position:sticky; top:0; z-index:50;
  background:rgba(238,240,231,0.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
nav.wrap{
  display:flex; align-items:center; justify-content:space-between;
  height:84px;
}
.brand{
  font-family:'Newsreader', serif;
  font-weight:600;
  font-size:28px;
  color:var(--ink);
  display:flex; align-items:center; gap:14px;
  line-height:1;
}
.brand-text{ display:flex; align-items:center; line-height:1; }
.brand-divider{ width:1px; height:24px; background:var(--line-strong); display:block; flex:none; }
.brand-logo{ height:25.5px; width:auto; display:block; flex:none; position:relative; top:-2px; }
.brand span.sub{
  font-family:'IBM Plex Mono', monospace;
  font-weight:400;
  font-size:11px;
  color:var(--ink-soft);
  letter-spacing:0.04em;
}
.navlinks{display:flex; gap:28px; align-items:center;}
.navlinks a{
  font-family:'IBM Plex Mono', monospace;
  font-size:13px;
  color:var(--ink);
  letter-spacing:0.02em;
  padding-bottom:4px;
  border-bottom:1.5px solid transparent;
}
.navlinks a:hover{color:var(--coral);}
.navlinks a.active{ color:var(--coral); border-bottom-color:var(--coral); }
.navcta{
  background:var(--ink);
  color:var(--paper) !important;
  padding:8px 16px;
  border-radius:var(--radius);
  font-size:12.5px !important;
  border-bottom:none !important;
}
.navcta:hover{background:var(--coral); color:var(--paper) !important;}
.navtoggle{display:none; background:none; border:none; cursor:pointer; padding:6px;}
.navtoggle span{display:block; width:22px; height:2px; background:var(--ink); margin:5px 0;}

@media (max-width: 780px){
  .navlinks{
    position:absolute; top:84px; left:0; right:0;
    background:var(--paper); flex-direction:column; align-items:flex-start;
    padding:18px 28px 24px; gap:16px; border-bottom:1px solid var(--line);
    display:none;
  }
  .navlinks.open{display:flex;}
  .navtoggle{display:block;}
}

/* ---------- PAGE HEADER (non-home pages) ---------- */
.pagehead{ padding:56px 0 40px; border-bottom:1px solid var(--line); }
.pagehead h1{ font-size:clamp(30px,4vw,44px); margin-top:14px; }

/* ---------- HERO (home only) ---------- */
.hero{ padding:76px 0 60px; position:relative; overflow:hidden; }
.hero-grid{ display:grid; grid-template-columns: 1.1fr 0.9fr; gap:48px; align-items:center; position:relative; }
.hero h1{ font-size:clamp(34px, 4.6vw, 54px); line-height:1.08; margin:18px 0 22px; }
.hero h1 em{ font-style:italic; color:var(--teal); }
.hero p.lede{ font-size:18px; color:var(--ink-soft); max-width:520px; margin-bottom:30px; }
.hero-ctas{display:flex; gap:14px; flex-wrap:wrap;}
.btn{
  font-family:'IBM Plex Mono', monospace; font-size:13px; letter-spacing:0.02em;
  padding:12px 20px; border-radius:var(--radius); display:inline-flex; align-items:center; gap:8px;
  border:1px solid var(--ink); transition:all .15s ease;
}
.btn-solid{background:var(--ink); color:var(--paper) !important;}
.btn-solid:hover{background:var(--coral); border-color:var(--coral); color:var(--paper) !important;}
.btn-line{background:transparent; color:var(--ink) !important;}
.btn-line:hover{border-color:var(--coral); color:var(--coral) !important;}

/* SEIR population field + corresponding epidemic curve */
.seir-hero{ display:flex; justify-content:center; }
.seir-frame{
  border:1px solid var(--line-strong); border-radius:var(--radius); background:var(--paper);
  padding:26px 26px 18px; max-width:460px; width:100%; box-shadow:var(--shadow);
}
.seir-grid{ display:grid; grid-template-columns:repeat(14,1fr); gap:8px; margin-bottom:18px; }
.seir-grid span{
  width:100%; aspect-ratio:1/1; border-radius:50%; background:#9fb0ac;
  transition:background-color .6s ease; display:block;
}
.seir-curve-svg{ display:block; width:100%; height:auto; }
.seir-legend{
  display:flex; flex-wrap:wrap; gap:14px; margin-bottom:14px;
  font-family:'IBM Plex Mono',monospace; font-size:10px; color:var(--ink-soft); letter-spacing:0.02em;
}
.seir-legend span{ display:inline-flex; align-items:center; gap:5px; }
.seir-legend .dot{ width:7px; height:7px; border-radius:50%; display:inline-block; flex:none; }
.seir-curve-i{ fill:none; stroke:var(--coral); stroke-width:2; }
.seir-curve-fill{ fill:var(--coral); opacity:0.08; }
.seir-playhead-line{ stroke:var(--ink); stroke-width:1; stroke-dasharray:2 3; opacity:0.5; }
.seir-playhead-dot{ fill:var(--ink); }
.seir-intervention-line{ stroke:var(--coral); stroke-width:1.3; stroke-dasharray:3 3; opacity:0.55; }
.seir-intervention-dot{ fill:var(--coral); }
.seir-intervention-label{ font-family:'IBM Plex Mono',monospace; font-size:8.5px; fill:var(--coral); letter-spacing:0.05em; }

.curve-divider{display:block; width:100%; height:56px;}
.curve-divider path{ fill:none; stroke:var(--line-strong); stroke-width:1.4; }
.curve-divider path.accent{ stroke:var(--coral); stroke-width:1.6; stroke-dasharray:4 420; animation:draw 7s ease-in-out infinite; }
@keyframes draw{ 0%{stroke-dashoffset:424;} 45%{stroke-dashoffset:0;} 100%{stroke-dashoffset:0;} }

@media (max-width:900px){
  .hero-grid{grid-template-columns:1fr;}
  .outbreak{margin-top:20px;}
}

/* ---------- EXPLORE TILES (home only) ---------- */
.explore{ padding:64px 0; }
.explore-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:1px; background:var(--line); border:1px solid var(--line); border-radius:var(--radius); overflow:hidden; }
.etile{ background:var(--paper); padding:26px 22px; transition:background .15s ease, box-shadow .15s ease; position:relative; z-index:1; }
.etile:hover{ box-shadow:var(--shadow); z-index:2; }
.etile:hover{ background:var(--paper-dim); }
.etile .tag{ font-family:'IBM Plex Mono',monospace; font-size:11px; color:var(--coral); text-transform:uppercase; letter-spacing:0.04em; }
.etile h3{ font-size:18px; margin:10px 0 8px; }
.etile p{ font-size:13.5px; color:var(--ink-soft); margin:0; }
@media (max-width:900px){ .explore-grid{grid-template-columns:repeat(2,1fr);} }
@media (max-width:560px){ .explore-grid{grid-template-columns:1fr;} }

/* ---------- SECTION GENERIC ---------- */
section{padding:74px 0;}
section.tight{padding:52px 0;}
@media (max-width:700px){
  section{ padding:44px 0; }
  section.tight{ padding:34px 0; }
  .policy{ padding:50px 0; }
}
section.section-alt{ background:var(--paper-dim); }
.section-head{
  display:flex; justify-content:space-between; align-items:flex-end;
  gap:24px; margin-bottom:38px; flex-wrap:wrap;
  border-bottom:1px solid var(--line); padding-bottom:22px;
}
.section-head h2{font-size:clamp(26px,3vw,34px);}
.section-head p{color:var(--ink-soft); max-width:440px; margin:8px 0 0;}

/* ---------- RESEARCH ---------- */
.overview-lede{
  font-family:'Newsreader',serif; font-weight:400;
  font-size:clamp(19px,2.1vw,23px); line-height:1.65; color:var(--ink);
  max-width:780px; margin:0 0 22px;
}
.overview-lede:last-of-type{ margin-bottom:0; }
.focus-list{ border-top:1px solid var(--line); margin-top:8px; }
.focus-item{ display:grid; grid-template-columns:96px 1fr; gap:28px; padding:36px 0; border-bottom:1px solid var(--line); align-items:start; }
.focus-icon{ width:96px; height:96px; flex:none; }
.focus-icon svg{ width:100%; height:100%; }
.focus-item .tag{ font-family:'IBM Plex Mono', monospace; font-size:11.5px; color:var(--coral); letter-spacing:0.04em; text-transform:uppercase; }
.focus-item h3{font-size:23px; margin:12px 0 12px; max-width:640px;}
.focus-item p{color:var(--ink-soft); margin:0; font-size:15.5px; max-width:700px;}
@media (max-width:600px){
  .focus-item{ grid-template-columns:64px 1fr; gap:18px; }
  .focus-icon{ width:64px; height:64px; }
}

.funding-note{ margin-top:26px; font-size:13.5px; color:var(--ink-soft); }
.funding-note b{ color:var(--ink); font-weight:500; }

/* ---------- POLICY IMPACT ---------- */
.policy{ background:var(--teal-deep); color:var(--paper); border-top:4px solid var(--gold); padding:90px 0; }
.policy .eyebrow{ color:#9FD9CE; }
.policy .eyebrow::before{ background:var(--gold); }
.policy .section-head{ border-bottom-color:rgba(238,240,231,0.18); }
.policy h2{ color:var(--paper); }
.policy-lede{
  font-family:'Newsreader',serif; font-weight:400; font-style:italic;
  font-size:clamp(23px,2.7vw,29px); line-height:1.5; color:var(--paper); margin:0 0 20px;
}
.policy-body p.sub{ color:rgba(238,240,231,0.72); font-size:15px; margin:0; max-width:780px; }

/* ---------- TEAM ---------- */
.pi{ display:grid; grid-template-columns:200px 1fr; gap:32px; align-items:start; }
.pi-photo{ width:100%; aspect-ratio:1/1; border-radius:var(--radius); object-fit:cover; display:block; box-shadow:var(--shadow); }
.pi h3{font-size:24px; margin-bottom:2px;}
.pi .role{font-family:'IBM Plex Mono',monospace; font-size:12.5px; color:var(--coral); margin-bottom:12px; display:block;}
.pi p{color:var(--ink-soft); max-width:640px;}
.pi .mail{font-family:'IBM Plex Mono',monospace; font-size:13px;}

.team-list{ display:flex; flex-direction:column; }
.trow{ display:grid; grid-template-columns:200px 1fr; gap:32px; padding:34px 0; border-bottom:1px solid var(--line); align-items:start; }
.trow:last-child{ border-bottom:none; }
.tphoto{ width:200px; height:200px; object-fit:cover; border-radius:var(--radius); display:block; box-shadow:var(--shadow); }
.tphoto.placeholder{
  display:flex; align-items:center; justify-content:center;
  background:linear-gradient(160deg, var(--teal) 0%, var(--teal-deep) 100%);
  color:var(--paper); font-family:'Newsreader',serif; font-weight:500; font-size:42px;
}
.trow h4{font-family:'Newsreader',serif; font-size:24px; font-weight:500; margin-bottom:8px;}
.trow p{font-size:16px; color:var(--ink-soft); margin:0 0 10px; max-width:640px;}
.trow .mail{font-family:'IBM Plex Mono',monospace; font-size:13px;}
@media (max-width:600px){
  .trow{ grid-template-columns:1fr; gap:16px; }
  .tphoto{ width:100px; height:100px; }
  .pi{ grid-template-columns:1fr; gap:20px; }
  .pi-photo{ width:130px; height:130px; }
}

details.alumni{margin-top:32px; border-top:1px solid var(--line); padding-top:20px;}
details.alumni summary{ cursor:pointer; font-family:'IBM Plex Mono',monospace; font-size:13px; color:var(--teal); list-style:none; }
details.alumni summary::-webkit-details-marker{display:none;}
details.alumni summary::before{content:'+ '; color:var(--coral);}
details.alumni[open] summary::before{content:'\2013 ';}
.alumni-list{margin-top:16px; font-size:14px; color:var(--ink-soft); line-height:1.8;}

/* ---------- PUBLICATIONS ---------- */
.pub{ display:grid; grid-template-columns:70px 1fr; gap:22px; padding:22px 0; border-bottom:1px solid var(--line); }
.pub:first-child{padding-top:0;}
.pub .year{ font-family:'Newsreader',serif; font-size:26px; color:var(--ink-soft); font-weight:400; }
.pub h3{font-size:18px; font-weight:500; margin-bottom:6px; line-height:1.35;}
.pub .journal{font-family:'IBM Plex Mono',monospace; font-size:12px; color:var(--teal); text-transform:uppercase; letter-spacing:0.03em; display:block; margin-bottom:8px;}
.pub .authors{font-size:13.5px; color:var(--ink-soft); margin-bottom:8px;}
.pub .links a{font-family:'IBM Plex Mono',monospace; font-size:12px; margin-right:16px;}
.full-list-note{ margin-top:30px; padding-top:26px; border-top:1px solid var(--line); font-size:14.5px; color:var(--ink-soft); }
.pub-status{ font-size:11.5px; color:var(--ink-soft); margin:0 0 22px; letter-spacing:0.02em; }
.pub-status.live{ color:var(--teal); }
.pub-status.error{ color:var(--ink-soft); }

/* ---------- JOIN ---------- */
.join{ background:var(--ink); color:var(--paper); border-radius:var(--radius); padding:52px; display:grid; grid-template-columns:1.3fr 1fr; gap:40px; align-items:center; }
.join h2{color:var(--paper); font-size:clamp(24px,3vw,32px); margin-bottom:14px;}
.join p{color:rgba(238,240,231,0.78); margin:0;}
.join .btn-solid{background:var(--coral); border-color:var(--coral);}
.join .btn-solid:hover{background:var(--gold); border-color:var(--gold);}
@media (max-width:780px){ .join{grid-template-columns:1fr; padding:34px 26px;} }

.phd-note{ margin-top:26px; padding-top:26px; border-top:1px solid var(--line); }
.phd-note b{ display:block; font-family:'IBM Plex Mono',monospace; font-size:11.5px; text-transform:uppercase; letter-spacing:0.05em; color:var(--teal); margin-bottom:8px; }
.phd-note p{ margin:0; font-size:14.5px; color:var(--ink-soft); max-width:680px; }

/* ---------- CONTACT / FOOTER ---------- */
.contact-lede{ max-width:640px; color:var(--ink-soft); margin:0 0 30px; font-size:15.5px; }
.building-photo{ width:100%; max-width:420px; height:auto; display:block; border-radius:var(--radius); box-shadow:var(--shadow); margin-top:16px; }
.contact-grid{display:grid; grid-template-columns:1fr 1fr; gap:40px;}
.contact-grid h4{ font-family:'IBM Plex Mono',monospace; font-size:12px; text-transform:uppercase; letter-spacing:0.05em; color:var(--teal); margin-bottom:10px; }
.contact-grid p{margin:0 0 20px; color:var(--ink-soft); font-size:14.5px;}
@media (max-width:700px){ .contact-grid{grid-template-columns:1fr;} }

footer{ border-top:1px solid var(--line); padding:30px 0; margin-top:20px; }
footer .wrap{ display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:12px; }
footer p{margin:0; font-family:'IBM Plex Mono',monospace; font-size:12px; color:var(--ink-soft);}