/* ZenteiQ website: shared styles. Every colour is a Brand Guidelines FINAL token (tints and shades table). */
:root{
  --teal:#3C6F78; --teal-s1:#315A60; --teal-s2:#254348; --turq:#60C4B5; --turq-t1:#81CEC3; --turq-tint:#A2D9D2;
  --white:#FFFFFF; --offwhite:#F2F2F3; --lgrey:#D3D3D3;
  --charcoal:#353535; --ink:#2A2A2A; --sec:#315A60; --muted:#315A60; --b-input:#7F7F7F; --b-row:#E5E5E5;
  --on-dark:#FFFFFF; --on-dark-sec:#D3D3D3;
  --active:rgba(60,111,120,.10); --pop:0 12px 32px rgba(37,67,72,.14);
  --warn-bg:#FEE0A3; --warn-ink:#2A2A2A;
  --font:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --math:"STIX Two Math","Cambria Math","Times New Roman",serif;
  --hdr:56px; --rnav:48px;
  box-sizing:border-box;
  padding-top:env(safe-area-inset-top,0px);
  padding-bottom:env(safe-area-inset-bottom,0px);
}
*,*::before,*::after{box-sizing:inherit}
[hidden]{display:none !important}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--hdr) + var(--rnav) + 20px + env(safe-area-inset-top,0px))}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none !important}}
body{margin:0;font-family:var(--font);font-size:16px;line-height:1.6;color:var(--charcoal);background:var(--white);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;font-feature-settings:"cv11"}
img{max-width:100%;display:block;height:auto}
a{color:var(--teal);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:3px}
button{font:inherit;color:inherit;cursor:pointer}
:focus-visible{outline:2px solid var(--teal);outline-offset:2px;border-radius:4px}
.dark :focus-visible{outline-color:var(--turq)}
h1,h2,h3{color:var(--ink);font-weight:600;margin:0;letter-spacing:-0.015em}
p{margin:0}
.wrap{max-width:1160px;margin:0 auto;padding:0 28px}
.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}
.skip{position:absolute;left:12px;top:-60px;z-index:100;background:var(--teal-s2);color:#fff;padding:10px 14px;border-radius:6px}
.skip:focus{top:12px}
.ico{width:16px;height:16px;flex:none;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.ico.back{transform:rotate(180deg)}

/* Section titles: ALL CAPS with tracking, per brand guideline */
.label{display:block;font-size:12.5px;line-height:1.4;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--teal)}
.dark .label{color:var(--turq)}

/* Placeholder marking (preview builds only; --release refuses to build while any remain) */
.ph{display:inline-flex;align-items:center;gap:4px;margin-left:8px;padding:1px 7px;border-radius:4px;background:var(--warn-bg);color:var(--warn-ink);font-size:12px;font-weight:500;letter-spacing:0;text-transform:none;vertical-align:middle;white-space:nowrap}
.ph-note{display:flex;gap:10px;align-items:flex-start;margin-top:24px;padding:12px 16px;border-radius:8px;background:var(--warn-bg);color:var(--warn-ink);font-size:14.5px;max-width:68ch}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;min-height:40px;padding:0 18px;border-radius:6px;border:1px solid var(--b-input);background:#fff;color:var(--charcoal);font-size:14.5px;font-weight:500;white-space:nowrap;text-decoration:none}
.btn:hover{background:var(--offwhite);text-decoration:none}
.btn-primary{background:var(--teal);border-color:var(--teal);color:#fff}
.btn-primary:hover{background:var(--teal-s1);border-color:var(--teal-s1)}
.btn-sm{min-height:34px;padding:0 13px;font-size:14px}
.btn-turq{background:var(--turq);border-color:var(--turq);color:var(--teal-s2);font-weight:600}
.btn-turq:hover{background:var(--turq-t1);border-color:var(--turq-t1)}
.btn-ghost{background:transparent;border-color:rgba(255,255,255,.55);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.08)}

/* Global header (mirrors homepage) */
.topbar{position:sticky;top:0;z-index:50;background:#fff;border-bottom:1px solid var(--lgrey);padding-top:env(safe-area-inset-top,0px)}
.topbar-in{height:var(--hdr);display:flex;align-items:center;gap:16px;position:relative}
.brand{display:flex;align-items:center;min-height:34px;border-radius:6px}
.brand img{height:29px;width:auto}
.nav{display:flex;align-items:center;gap:2px;margin-left:28px}
.nav-item{display:inline-flex;align-items:center;gap:4px;min-height:34px;padding:0 11px;border-radius:6px;border:0;background:none;color:var(--charcoal);font-size:14px;font-weight:500;text-decoration:none}
.nav-item:hover{background:var(--active);text-decoration:none}
.nav-item[aria-current="page"],.nav-item[aria-expanded="true"]{background:var(--active);color:var(--ink)}
.nav-item .chev{transition:transform .15s}
.nav-item[aria-expanded="true"] .chev{transform:rotate(180deg)}
.bar-right{margin-left:auto;display:flex;align-items:center;gap:6px}
.icon-btn{display:inline-grid;place-items:center;width:38px;height:38px;border-radius:6px;border:1px solid transparent;background:transparent;color:var(--sec)}
.icon-btn:hover{background:var(--active);color:var(--ink)}
.menu-toggle{display:none}
.mega{position:absolute;left:0;right:0;top:100%;display:none;padding:8px 28px 0}
.mega.open{display:block}
.mega-in{max-width:1104px;margin:0 auto;background:#fff;border:1px solid var(--lgrey);border-radius:10px;box-shadow:var(--pop);display:grid;grid-template-columns:1.15fr 1fr 1.2fr .9fr}
.mega-col{padding:18px 16px 20px;border-left:1px solid var(--b-row)}
.mega-col:first-child{border-left:0}
.mega-col h3{font-size:12.5px;font-weight:500;color:var(--muted);margin:0 0 8px 8px;letter-spacing:0}
.mega-link{display:flex;align-items:flex-start;gap:6px;padding:8px;border-radius:6px;color:var(--charcoal);text-decoration:none;min-height:34px}
.mega-link:hover{background:var(--active);text-decoration:none}
.mega-link b{display:block;font-weight:600;font-size:14px;color:var(--ink)}
.mega-link span{display:block;font-size:12.5px;color:var(--muted);line-height:1.4}
.mega-link .ico{margin-top:2px;margin-left:auto;color:var(--muted);opacity:0;transition:opacity .12s}
.mega-link:hover .ico,.mega-link:focus-visible .ico{opacity:1}

/* Research navigation: links styled as tabs */
.rnav{position:sticky;top:calc(var(--hdr) + env(safe-area-inset-top,0px));z-index:40;background:#fff;border-bottom:1px solid var(--lgrey)}
.rnav-in{display:flex;align-items:stretch;flex-wrap:wrap;column-gap:4px;min-height:var(--rnav)}
.rnav-in a:first-child{margin-left:-12px}
.rnav a{display:inline-flex;align-items:center;min-height:var(--rnav);padding:0 12px;color:var(--sec);font-size:14.5px;font-weight:500;border-bottom:2px solid transparent;margin-bottom:-1px;text-decoration:none}
.rnav a:hover{color:var(--ink)}
.rnav a[aria-current="page"]{color:var(--ink);font-weight:600;border-bottom-color:var(--teal)}

/* Shared section rhythm */
.band{padding:88px 0}
.band.alt{background:var(--offwhite)}
.dark{background-color:var(--teal-s2);color:var(--on-dark)}
.dark h1,.dark h2,.dark h3{color:var(--on-dark)}
.atmos{background-image:url("../img/atmosphere.svg");background-size:cover;background-position:right center;background-repeat:no-repeat}

/* 1. Intro */
.intro{padding:96px 0 104px}
.intro h1{margin-top:20px;max-width:15ch;font-size:clamp(36px,5.4vw,64px);line-height:1.04;letter-spacing:-0.03em}
.intro p{margin-top:24px;max-width:46ch;font-size:clamp(17px,1.5vw,19.5px);line-height:1.55;color:var(--on-dark-sec)}

/* 2. At a glance */
.glance{padding:56px 0 44px}
.glance dl{display:grid;grid-template-columns:repeat(var(--n,3),minmax(0,1fr));margin:0}
.glance .m{padding:4px 32px 4px 32px;border-left:1px solid var(--lgrey)}
.glance .m:first-child{padding-left:0;border-left:0}
.glance dd{margin:0;font-size:clamp(44px,5vw,64px);line-height:1;font-weight:500;letter-spacing:-0.035em;color:var(--teal);font-variant-numeric:tabular-nums}
.glance dt{margin-top:12px;font-size:15.5px;color:var(--charcoal)}
.glance dl > div{display:flex;flex-direction:column-reverse;justify-content:flex-end}
.asof{margin-top:32px;font-size:13px;color:var(--muted);text-align:right}

/* 3. Featured research */
.feat-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;margin-top:32px}
.feat{display:flex;flex-direction:column}
.fig-panel{background:var(--teal-s2);border-radius:10px;overflow:hidden;aspect-ratio:16/10}
.fig-panel img{width:100%;height:100%;object-fit:cover}
.feat-id{display:flex;align-items:center;gap:12px;margin-top:28px}
.feat-id img{width:40px;height:40px;border-radius:9px}
.feat h2{margin-top:8px;font-size:clamp(28px,3vw,36px);letter-spacing:-0.025em}
.feat-statement{margin-top:14px;font-size:17px;line-height:1.6;max-width:48ch}
.feat-links{margin-top:24px;display:flex;flex-direction:column;gap:14px}
.primary-link{display:inline-flex;align-items:center;gap:8px;font-weight:600;font-size:16px;color:var(--teal)}
.res{display:flex;flex-wrap:wrap;gap:6px 22px;list-style:none;margin:0;padding:0;font-size:14.5px}
.res a{color:var(--sec);text-decoration:underline;text-decoration-color:var(--lgrey);text-underline-offset:4px}
.res a:hover{color:var(--teal);text-decoration-color:currentColor}

/* 4. People */
.people h2{font-size:clamp(28px,3.1vw,38px);line-height:1.15;letter-spacing:-0.02em;max-width:18ch}
.people-grid{display:grid;grid-template-columns:minmax(0,6fr) minmax(0,5fr);gap:72px;margin-top:44px;align-items:start}
.founder .name{margin-top:10px;font-size:24px;letter-spacing:-0.02em}
.founder .bio{margin-top:14px;font-size:16.5px;line-height:1.65;max-width:58ch}
.founder .ph{margin:14px 0 0}
.team h3{font-size:17px}
.team p{margin-top:8px;color:var(--sec);font-size:15.5px;max-width:42ch}
.team ul{list-style:none;margin:24px 0 0;padding:0;display:grid;grid-template-columns:1fr 1fr;column-gap:24px}
.team li{padding:13px 0;border-top:1px solid var(--lgrey);font-size:15.5px;font-weight:500;color:var(--ink)}

/* 5. Research context & ecosystem */
.eco dl{margin:28px 0 0;border-bottom:1px solid var(--lgrey)}
.eco dl > div{display:grid;grid-template-columns:minmax(0,4fr) minmax(0,8fr);gap:32px;padding:20px 0;border-top:1px solid var(--lgrey)}
.eco dt{font-weight:600;color:var(--ink);font-size:16.5px}
.eco dd{margin:0;font-size:16px;max-width:62ch}

/* 6. CTA */
.cta{padding:80px 0}
.cta .wrap{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:40px;align-items:end}
.cta h2{font-size:clamp(28px,3.1vw,38px);line-height:1.15;letter-spacing:-0.02em;max-width:18ch}
.cta p{margin-top:14px;color:var(--on-dark-sec);font-size:16.5px;max-width:52ch}
.cta-acts{display:flex;flex-wrap:wrap;gap:12px;justify-content:flex-start}

/* Page heads (Blog, Publications) */
.page-head{padding:64px 0 40px;border-bottom:1px solid var(--lgrey)}
.page-head h1{margin-top:14px;font-size:clamp(34px,4.2vw,52px);line-height:1.08;letter-spacing:-0.03em}
.page-head p{margin-top:14px;font-size:18px;color:var(--sec);max-width:52ch}

/* Blog list (editorial) */
.posts{list-style:none;margin:0;padding:0 0 88px}
.post{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:48px;padding:40px 0;border-bottom:1px solid var(--lgrey);align-items:start}
.post h2{margin-top:10px;font-size:clamp(22px,2.2vw,27px);line-height:1.25;letter-spacing:-0.02em;max-width:30ch}
.post h2 a{color:var(--ink)}
.post h2 a:hover{color:var(--teal)}
.post .summary{margin-top:12px;font-size:17px;max-width:60ch}
.meta{margin-top:14px;display:flex;flex-wrap:wrap;gap:4px 18px;font-size:14px;color:var(--muted)}
.post .fig-panel{border-radius:8px}

/* Article */
.art-head{padding:44px 0 8px}
.back{display:inline-flex;align-items:center;gap:8px;font-size:14.5px;font-weight:500;color:var(--sec)}
.back:hover{color:var(--teal)}
.art-head .label{margin-top:36px}
.art-head h1{margin-top:12px;font-size:clamp(32px,4.4vw,52px);line-height:1.08;letter-spacing:-0.03em;max-width:20ch}
.art-head .meta{margin-top:18px;font-size:15px}
.art-head .dek{margin-top:16px;font-size:20px;line-height:1.55;color:var(--sec);max-width:62ch}
.prose{padding:40px 0 24px;font-size:18px;line-height:1.72}
.prose > *{max-width:68ch}
.prose p{margin:0 0 22px}
.prose .lede{font-size:21px;line-height:1.55;color:var(--ink);margin-bottom:32px}
.prose h2{margin:52px 0 14px;font-size:26px;line-height:1.25;letter-spacing:-0.02em}
.prose i{font-family:var(--math);font-size:1.06em}
.prose .eq{margin:6px 0 26px;padding:20px 24px;background:var(--offwhite);border-left:3px solid var(--turq);border-radius:0 8px 8px 0;font-family:var(--math);font-size:23px;text-align:center;overflow-x:auto;white-space:nowrap}
.prose figure.wide{max-width:960px;margin:44px 0}
.prose figure.wide .fig-panel{border-radius:10px}
.prose figcaption{margin-top:12px;font-size:14.5px;line-height:1.55;color:var(--sec);max-width:68ch}
.prose a,.note a,.lead-p a,.bio a,.feat-statement a,.prose-link{text-decoration:underline;text-underline-offset:3px}
.refs{padding-left:22px;font-size:15.5px;line-height:1.6;color:var(--sec)}
.refs li{margin-bottom:10px}
.related{margin:16px 0 88px;padding:28px 28px 26px;background:var(--offwhite);border-radius:10px;max-width:68ch}
.related ul{list-style:none;margin:14px 0 0;padding:0;display:grid;gap:10px}
.related a{display:inline-flex;align-items:center;gap:8px;font-weight:500}

/* Publications */
.pubs{padding-bottom:88px}
.pub{padding:40px 0;border-bottom:1px solid var(--lgrey)}
.pub h2{font-size:clamp(22px,2.2vw,27px);line-height:1.25;letter-spacing:-0.02em;max-width:34ch}
.pub .authors{margin-top:10px;font-size:16px;color:var(--ink)}
.pub .meta{margin-top:8px}
.pub-acts{margin-top:20px;display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.pub .abstract{margin-top:28px;max-width:72ch}
.pub .abstract p{margin-top:10px;font-size:16.5px;line-height:1.7}
.pub .pub-note{margin-top:16px;font-size:15.5px;font-weight:500;color:var(--teal)}
.cite{margin-top:20px;max-width:72ch;border:1px solid var(--lgrey);border-radius:8px;overflow:hidden}
.cite pre{margin:0;padding:16px 18px;background:var(--offwhite);font-size:13px;line-height:1.55;overflow-x:auto;white-space:pre}
.cite-bar{display:flex;justify-content:flex-end;padding:8px 10px;border-top:1px solid var(--lgrey);background:#fff}

/* Updates */
.updates{list-style:none;margin:0;padding:0 0 88px}
.update{display:grid;grid-template-columns:180px minmax(0,1fr);gap:32px;padding:32px 0;border-bottom:1px solid var(--lgrey)}
.update time{font-size:14.5px;font-weight:500;color:var(--teal);font-variant-numeric:tabular-nums}
.update h2{font-size:21px;line-height:1.3}
.update p{margin-top:8px;max-width:62ch}
.update:target{background:var(--offwhite)}

/* Footer (mirrors homepage) */
.foot{background:var(--offwhite);padding:48px 0 calc(28px + env(safe-area-inset-bottom,0px))}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px}
.foot img{height:29px;width:auto}
.foot .tag{margin-top:14px;font-size:14px;color:var(--sec)}
.foot h3{font-size:12.5px;color:var(--muted);font-weight:500;margin-bottom:10px;letter-spacing:0}
.foot ul{list-style:none;margin:0;padding:0;display:grid;gap:4px}
.foot ul a{color:var(--charcoal);display:inline-flex;align-items:center;gap:6px;min-height:30px;font-size:14.5px}
.foot-bottom{margin-top:44px;padding-top:16px;border-top:1px solid var(--lgrey);display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:12.5px;color:var(--muted)}

/* Responsive */
@media (max-width:900px){
  .wrap{padding:0 18px}
  .menu-toggle{display:inline-grid}
  .nav{position:absolute;top:100%;left:0;right:0;margin:0;display:none;flex-direction:column;align-items:stretch;background:#fff;border-bottom:1px solid var(--lgrey);padding:8px 18px 14px;max-height:calc(100vh - var(--hdr));overflow:auto}
  .nav.open{display:flex}
  .nav-item{min-height:44px;justify-content:space-between}
  .mega{position:static;padding:0 0 8px}
  .mega-in{grid-template-columns:1fr;box-shadow:none;border-radius:8px}
  .mega-col{border-left:0;border-top:1px solid var(--b-row)}
  .mega-col:first-child{border-top:0}
  .mega-link .ico{opacity:1}
  .band{padding:64px 0}
  .intro{padding:64px 0 72px}
  .feat-grid,.people-grid,.cta .wrap{grid-template-columns:1fr;gap:48px}
  .people-grid{gap:44px}
  .post{grid-template-columns:1fr;gap:20px}
  .post .fig-panel{order:-1;max-width:420px}
  .eco dl > div{grid-template-columns:1fr;gap:6px}
  .update{grid-template-columns:1fr;gap:6px}
  .foot-grid{grid-template-columns:1fr 1fr}

}
@media (max-width:640px){
  .glance dl{grid-template-columns:1fr}
  .glance .m{padding:18px 0;border-left:0;border-top:1px solid var(--lgrey)}
  .glance .m:first-child{border-top:0;padding-top:0}
  .asof{text-align:left;margin-top:16px}
  .team ul{grid-template-columns:1fr}
  .rnav a{padding:0 10px;min-height:44px}
  .prose{font-size:17px}
  .prose .lede{font-size:19px}
  .prose .eq{font-size:19px}
  .bar-right .btn-primary{padding:0 12px}
}
@media (max-width:420px){.foot-grid{grid-template-columns:1fr}}
@media (max-width:359px){.bar-right .btn-primary{display:none}}

/* ---------- Dhīr model page ---------- */
.intro-id{display:flex;align-items:center;gap:14px}
.dhir-mark{width:auto;display:inline-block}
.dhir-mark.mark-lg{height:44px}
.dhir-mark.mark-sm{height:22px;margin-right:10px;vertical-align:-2px}
.intro-acts{margin-top:32px;display:flex;flex-wrap:wrap;gap:12px}
.intro .licence{margin-top:18px;font-size:14.5px;color:var(--on-dark-sec)}
.intro .licence a{color:#fff;text-decoration:underline;text-underline-offset:3px}
.mgrid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:28px}
.mcard{border:1px solid var(--lgrey);border-radius:10px;padding:28px 28px 20px}
.mcard h3{font-size:clamp(24px,2.6vw,30px);letter-spacing:-0.02em}
.mkind{margin-top:6px;color:var(--sec);font-size:15.5px}
.mcard dl{margin:20px 0 0}
.mcard dl>div{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:16px;padding:11px 0;border-top:1px solid var(--b-row)}
.mcard dt{color:var(--sec);font-size:14.5px}
.mcard dd{margin:0;font-weight:500;color:var(--ink);font-variant-numeric:tabular-nums}
.note{margin-top:18px;font-size:14.5px;color:var(--sec);max-width:76ch}
.claim{margin-top:18px;font-size:clamp(20px,2vw,24px);line-height:1.4;color:var(--ink);font-weight:500;max-width:40ch;letter-spacing:-0.01em}
.facts{list-style:none;margin:32px 0 0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 48px}
.facts li{padding:20px 0;border-top:1px solid var(--lgrey)}
.facts h3{font-size:17px}
.facts p{margin-top:6px;font-size:16px;max-width:52ch}
.tbl{margin-top:24px;overflow-x:auto;border:1px solid var(--lgrey);border-radius:10px;background:#fff}
.tbl table{border-collapse:collapse;width:100%;min-width:560px;font-variant-numeric:tabular-nums}
.tbl th,.tbl td{padding:14px 18px;text-align:right;border-bottom:1px solid var(--b-row);font-size:15.5px}
.tbl thead th{font-size:13px;font-weight:600;color:var(--sec);background:var(--offwhite)}
.tbl th[scope="row"],.tbl thead th:first-child{text-align:left;color:var(--ink);font-weight:600}
.tbl tbody tr:last-child>*{border-bottom:0}
.points{margin:20px 0 0;padding-left:20px;max-width:76ch}
.points li{margin:6px 0}
.two{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:56px;align-items:start}
.lead-p{margin-top:14px;font-size:17px;max-width:52ch}
.next-name{margin-top:12px;font-size:clamp(26px,3vw,34px);letter-spacing:-0.02em}
.limits{list-style:none;margin:0;padding:0}
.limits li{padding:14px 0;border-top:1px solid var(--lgrey);font-size:16px}
.mega-icon{width:28px;height:28px;border-radius:7px;flex:none}
@media (max-width:900px){.mgrid,.two{grid-template-columns:1fr;gap:28px}.facts{grid-template-columns:1fr}}

/* ---------- Shared components (homepage, Dhīr, Research) ---------- */
.btn-lg{min-height:46px;padding:0 22px;font-size:15.5px}
.cap{font-size:13.5px;color:var(--sec)}
.sec-head{display:grid;grid-template-columns:minmax(0,6fr) minmax(0,5fr);gap:56px;align-items:end}
.options{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:20px 0 0;padding:0}
.options li{border:1px solid var(--lgrey);border-radius:999px;padding:6px 14px;font-size:14.5px;font-weight:500;color:var(--ink);background:var(--white)}
.steps{list-style:none;margin:32px 0 0;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-top:1px solid var(--lgrey)}
.steps li{display:flex;gap:14px;padding:22px 24px 0 0}
.steps li+li{padding-left:24px;border-left:1px solid var(--lgrey)}
.step-n{flex:none;display:inline-grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--teal);color:var(--white);font-size:13px;font-weight:600}
.steps h3{font-size:17px}
.steps p{margin-top:6px;font-size:15.5px}

/* ---------- Research: direction (scientific models, in development) ---------- */
.direction{padding:88px 0}
.direction h2{margin-top:16px;font-size:clamp(30px,3.6vw,46px);line-height:1.1;letter-spacing:-0.025em;max-width:22ch}
.dir-text{margin-top:18px;color:var(--on-dark-sec);font-size:17px;max-width:66ch}
.versus{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:36px}
.vpanel{margin:0;border:1px solid rgba(162,217,210,.22);border-radius:8px;overflow:hidden;display:flex;flex-direction:column}
.vhead{display:flex;align-items:center;gap:8px;padding:12px 16px;border-bottom:1px solid rgba(162,217,210,.22);font-size:13px;font-weight:500;color:var(--b-row)}
.vhead .ico{color:var(--turq)}
.vhead .tag{margin-left:auto;font-size:11.5px;color:var(--on-dark-sec);font-weight:400}
.vbody{position:relative;flex:1;min-height:260px}
.prose-vague{padding:22px 22px 0;font-size:15px;line-height:1.75;color:var(--on-dark-sec)}
.prose-vague .lines{margin-top:18px;display:grid;gap:9px}
.prose-vague .lines i{display:block;height:8px;border-radius:4px;background:rgba(162,217,210,.10)}
#compute{position:absolute;inset:0;width:100%;height:100%}
.vfoot{padding:10px 16px;border-top:1px solid rgba(162,217,210,.22);font-size:12px;color:var(--on-dark-sec);display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
.eq{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;color:var(--b-row);white-space:nowrap}

@media (max-width:900px){
  .sec-head{grid-template-columns:1fr;gap:16px;align-items:start}
  .steps{grid-template-columns:1fr}
  .steps li,.steps li+li{padding:20px 0 0;border-left:0}
  .versus{grid-template-columns:1fr}
  .direction{padding:64px 0}
}

/* Blog posts: section index in the left margin on wide screens (built by site.js from the post's h2s) */
.rail{display:none}
@media (min-width:1540px){
  .rail{display:block;position:fixed;top:180px;left:calc(50% - 552px - 210px);width:180px;font-size:13px;line-height:1.35;z-index:5;transition:opacity .2s}
  article.centered .rail{left:calc(50% - 520px - 210px)}
  .rail[data-off]{opacity:0;pointer-events:none}
  .rail a{display:grid;grid-template-columns:26px 1fr;gap:4px;color:var(--sec);text-decoration:none;padding:6px 0 6px 12px;border-left:2px solid var(--b-row);transition:color .15s,border-color .15s}
  .rail a span{font-size:11.5px;font-variant-numeric:tabular-nums;padding-top:1px}
  .rail a:hover{color:var(--ink)}
  .rail a[aria-current="true"]{color:var(--ink);border-left-color:var(--teal)}
  .rail a[aria-current="true"] span{color:var(--teal)}
}
@media (min-width:1480px) and (max-width:1539px){
  article.centered .rail{display:block;position:fixed;top:180px;left:calc(50% - 520px - 210px);width:180px;font-size:13px;line-height:1.35}
}
article.centered .wrap{max-width:1096px}
/* Blog posts: numbered section headings (01, 02, …), matching the left index */
.rail ~ .wrap .prose{counter-reset:sec}
.rail ~ .wrap .prose h2{counter-increment:sec;scroll-margin-top:calc(var(--hdr) + var(--rnav) + 16px)}
.rail ~ .wrap .prose h2::before{content:counter(sec,decimal-leading-zero);display:block;font-size:12.5px;font-weight:600;letter-spacing:.08em;line-height:1;color:var(--teal);margin-bottom:.9em;padding-top:1.1em;border-top:1px solid var(--b-row)}
.facts .fact-link{display:inline-block;margin:10px 18px 0 0;font-size:15px;font-weight:500;text-decoration:underline;text-underline-offset:3px}