/* ============================================================================
   SiteLitmus — "The Instrument" shared design system
   Dark precision-lab aesthetic. Single signature: the litmus gradient,
   blue (#2D6BFF, economic pole) -> pink (#FF2D6F, execution pole).
   Bricolage Grotesque display · Instrument Sans body · JetBrains Mono data.
   Linked by every marketing page; page-specific layout stays inline per page.
   ============================================================================ */

:root{
  --bg:#08090C; --bg2:#0C0E13; --card:rgba(255,255,255,.025);
  --card2:rgba(255,255,255,.045); --line:rgba(255,255,255,.08);
  --line2:rgba(255,255,255,.14); --text:#EDF0F6; --mut:#99A2B2; --dim:#6B7384;
  --blue:#2D6BFF; --pink:#FF2D6F; --green:#2AD37E;
  --grad:linear-gradient(135deg,var(--blue),var(--pink));
  --disp:"Bricolage Grotesque",sans-serif; --body:"Instrument Sans",sans-serif;
  --mono:"JetBrains Mono",monospace;
  --rad:16px; --rad-lg:24px; --w:1180px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{background:var(--bg);color:var(--text);font-family:var(--body);font-size:16.5px;
  line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
::selection{background:rgba(45,107,255,.35)}
a{color:inherit;text-decoration:none}
img,svg,canvas{max-width:100%;display:block}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
:focus-visible{outline:2px solid var(--blue);outline-offset:3px;border-radius:4px}

/* grain overlay — the film that makes flat dark feel physical */
body::after{content:"";position:fixed;inset:-50%;z-index:2000;pointer-events:none;opacity:.05;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation:grain 9s steps(9) infinite}
@keyframes grain{0%,100%{transform:translate(0,0)}12%{transform:translate(-3%,2%)}25%{transform:translate(2%,-3%)}
  37%{transform:translate(-2%,-2%)}50%{transform:translate(3%,3%)}62%{transform:translate(-3%,1%)}
  75%{transform:translate(2%,2%)}87%{transform:translate(-1%,-3%)}}
@media(prefers-reduced-motion:reduce){body::after{animation:none}}

/* ---------- layout utilities ---------- */
.wrap{max-width:var(--w);margin:0 auto;padding:0 24px}
.mono{font-family:var(--mono)}
.center{text-align:center}
.skip{position:absolute;left:-9999px;top:0;background:var(--blue);color:#fff;padding:10px 18px;z-index:3000;border-radius:0 0 10px 0}
.skip:focus{left:0}
section{padding:110px 0;position:relative}
.sechead{margin-bottom:54px}
.center .sub{margin-left:auto;margin-right:auto}
/* page shell for interior (non-hero) pages: clears the fixed nav */
.pagetop{padding:150px 0 20px;position:relative;overflow:hidden}
.pagetop::before{content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(60% 60% at 22% 0%,rgba(45,107,255,.12),transparent 60%),
             radial-gradient(50% 55% at 92% 12%,rgba(255,45,111,.09),transparent 60%)}
.pagetop .wrap{position:relative}
.eyebrow{color:var(--mut)}

/* ---------- typography ---------- */
h1,h2,h3{font-family:var(--disp);font-weight:700;letter-spacing:-.02em;line-height:1.06}
h1{font-size:clamp(36px,5.2vw,60px);font-weight:800}
h2{font-size:clamp(30px,4.6vw,46px);margin:18px 0 14px}
h3{font-size:20px}
.sub{color:var(--mut);max-width:640px;font-size:17.5px}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* kicker chip — mono label with litmus strip */
.kick{display:inline-flex;align-items:center;gap:10px;font-family:var(--mono);font-size:11.5px;
  letter-spacing:.14em;text-transform:uppercase;color:var(--mut);padding:7px 14px;
  border:1px solid var(--line);border-radius:100px;background:var(--card)}
.kick i{width:14px;height:5px;border-radius:3px;background:var(--grad);flex:none}

/* ---------- buttons ---------- */
.btn{position:relative;display:inline-flex;align-items:center;gap:9px;font-weight:600;font-size:15.5px;
  padding:13px 24px;border-radius:12px;transition:transform .25s cubic-bezier(.2,.8,.25,1),box-shadow .25s,background .25s;will-change:transform}
.btn .ar{transition:transform .25s}
.btn:hover .ar{transform:translateX(4px)}
.btn-p{background:var(--grad);color:#fff;box-shadow:0 8px 30px -8px rgba(45,107,255,.55)}
.btn-p:hover{box-shadow:0 12px 40px -8px rgba(255,45,111,.5)}
.btn-g{border:1px solid var(--line2);background:var(--card);color:var(--text)}
.btn-g:hover{background:var(--card2);border-color:rgba(255,255,255,.25)}
.btn-row{display:flex;gap:14px;flex-wrap:wrap}

/* ---------- nav ---------- */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;transition:background .3s,border-color .3s;border-bottom:1px solid transparent}
.nav.solid{background:rgba(8,9,12,.78);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-color:var(--line)}
.nav-in{max-width:var(--w);margin:0 auto;padding:0 24px;height:64px;display:flex;align-items:center;gap:26px}
.logo{display:flex;align-items:center;gap:10px;font-family:var(--disp);font-weight:700;font-size:18.5px;letter-spacing:-.01em}
.logo svg{width:26px;height:26px;flex:none}
.nlinks{display:flex;align-items:center;gap:26px;margin-left:auto}
.nlinks a{font-size:14.5px;color:var(--mut);transition:color .2s;position:relative}
.nlinks a:not(.btn):hover{color:var(--text)}
.nlinks a:not(.btn)::after{content:"";position:absolute;left:0;right:100%;bottom:-4px;height:1.5px;background:var(--grad);transition:right .25s}
.nlinks a:not(.btn):hover::after{right:0}
.nlinks .btn{padding:9px 18px;font-size:14px}
.nburger{display:none;margin-left:auto;width:40px;height:40px;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:10px}
.nburger span,.nburger span::before,.nburger span::after{display:block;width:16px;height:1.6px;background:var(--text);position:relative;transition:transform .3s,opacity .3s}
.nburger span::before,.nburger span::after{content:"";position:absolute;left:0}
.nburger span::before{top:-5px}.nburger span::after{top:5px}
.nav.open .nburger span{transform:rotate(45deg)}
.nav.open .nburger span::before{transform:rotate(-90deg);top:0}
.nav.open .nburger span::after{opacity:0}
.nprog{position:absolute;left:0;bottom:-1px;height:1.5px;width:100%;background:var(--grad);transform-origin:0 50%;transform:scaleX(0)}

/* ---------- generic cards & grids ---------- */
.card{border:1px solid var(--line);border-radius:var(--rad-lg);padding:28px;background:var(--card);
  position:relative;transition:border-color .3s,transform .3s,background .3s}
.card:hover{border-color:rgba(255,255,255,.2);transform:translateY(-3px)}
.card h3{margin-bottom:8px}
.card p{font-size:14.5px;color:var(--mut)}
.grid{display:grid;gap:16px}
.grid2{grid-template-columns:repeat(2,1fr)}
.grid3{grid-template-columns:repeat(3,1fr)}
.grid4{grid-template-columns:repeat(4,1fr)}
.bic{width:42px;height:42px;border-radius:12px;border:1px solid var(--line2);display:flex;align-items:center;justify-content:center;
  background:var(--card2);margin-bottom:16px}
.bic svg{width:20px;height:20px;stroke:url(#lg);fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.go{display:inline-flex;align-items:center;gap:6px;margin-top:14px;font-size:13.5px;font-weight:600;color:var(--mut);transition:color .25s}
.go i{transition:transform .25s;font-style:normal}
.card:hover .go,.go:hover{color:var(--text)}
.card:hover .go i,.go:hover i{transform:translateX(4px)}
.badge{font-family:var(--mono);font-size:10px;letter-spacing:.1em;padding:3px 8px;border-radius:5px;
  border:1px solid rgba(255,45,111,.4);color:var(--pink);text-transform:uppercase}

/* ---------- data / comparison tables ---------- */
.cmp{border:1px solid var(--line);border-radius:var(--rad-lg);overflow:hidden;background:var(--card)}
.cmp-scroll{overflow-x:auto}
.cmp table{width:100%;border-collapse:collapse;min-width:640px}
.cmp th,.cmp td{padding:15px 20px;text-align:center;font-size:14.5px;border-bottom:1px solid var(--line)}
.cmp tr:last-child td{border-bottom:0}
.cmp th{font-family:var(--mono);font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--mut);font-weight:500;background:var(--bg2)}
.cmp td:first-child,.cmp th:first-child{text-align:left}
.cmp td:first-child{color:var(--mut)}
.cmp .yes{color:var(--green);font-weight:700}
.cmp .no{color:var(--dim)}
.cmp th.me{color:var(--text);background:linear-gradient(180deg,rgba(45,107,255,.18),rgba(45,107,255,.06))}
.cmp td.me{background:rgba(45,107,255,.05)}

/* ---------- FAQ / disclosure ---------- */
.faq{max-width:760px;margin:0 auto}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;
  cursor:pointer;padding:22px 4px;font-family:var(--disp);font-weight:600;font-size:17.5px}
.faq summary::-webkit-details-marker{display:none}
.faq summary .pm{font-family:var(--mono);color:var(--dim);font-size:18px;transition:transform .3s;flex:none}
.faq details[open] summary .pm{transform:rotate(45deg)}
.faq .fa{padding:0 4px 22px;color:var(--mut);font-size:15px;max-width:680px}
.faq .fa a{color:var(--text);font-weight:600;border-bottom:1px solid var(--line2)}

/* ---------- forms ---------- */
.field{margin-bottom:16px}
.field label{display:block;font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--dim);margin-bottom:8px}
.field input,.field textarea,.field select{width:100%;background:var(--card);border:1px solid var(--line2);border-radius:12px;
  color:var(--text);font:inherit;font-size:15px;padding:13px 15px;transition:border-color .2s,background .2s}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--blue);background:var(--card2)}
.field textarea{resize:vertical;min-height:120px}
.field input::placeholder,.field textarea::placeholder{color:var(--dim)}

/* ---------- long-form prose (legal, methodology, whitepaper) ---------- */
.prose{max-width:760px;font-size:16px;color:var(--mut)}
.prose h2{font-size:clamp(24px,3vw,32px);color:var(--text);margin:44px 0 14px}
.prose h3{font-size:19px;color:var(--text);margin:30px 0 10px}
.prose p{margin:0 0 16px}
.prose ul,.prose ol{margin:0 0 16px 22px}
.prose li{margin:0 0 8px}
.prose a{color:var(--text);font-weight:600;border-bottom:1px solid var(--line2);transition:border-color .2s}
.prose a:hover{border-color:var(--pink)}
.prose strong,.prose b{color:var(--text);font-weight:600}
.prose hr{border:0;border-top:1px solid var(--line);margin:36px 0}
.prose code{font-family:var(--mono);font-size:.9em;background:var(--card2);border:1px solid var(--line);border-radius:6px;padding:2px 6px}
.prose table{width:100%;border-collapse:collapse;margin:0 0 20px;font-size:14.5px}
.prose th,.prose td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--line)}
.prose th{font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--dim);font-weight:500}
.lede{font-size:clamp(17px,2vw,20px);color:var(--text);line-height:1.55;max-width:720px}
.updated{font-family:var(--mono);font-size:12px;letter-spacing:.04em;color:var(--dim);margin:0 0 8px}
/* gradient pull-quote (about, methodology, whitepaper) */
.pull{border-left:3px solid var(--blue);border-image:var(--grad) 1;padding:4px 0 4px 22px;margin:28px 0;
  font-family:var(--disp);font-size:clamp(18px,2.2vw,22px);font-weight:500;color:var(--text);line-height:1.4}
.pull em{font-style:italic}
/* inset note / callout */
.note{border:1px solid var(--line);border-left:3px solid var(--blue);border-radius:0 12px 12px 0;
  background:var(--card);padding:16px 20px;margin:22px 0;font-size:14.5px;color:var(--mut)}
.note b{color:var(--text)}

/* ---------- source/trust pills ---------- */
.srcrow{display:flex;gap:10px;flex-wrap:wrap}
.srcrow span{font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;color:var(--mut);
  padding:8px 15px;border:1px solid var(--line);border-radius:100px;background:var(--card)}

/* ---------- CTA band ---------- */
.cta{position:relative;overflow:hidden;text-align:center;border-top:1px solid var(--line)}
.cta::before{content:"";position:absolute;inset:0;
  background:radial-gradient(55% 70% at 50% 115%,rgba(255,45,111,.16),transparent 65%),
             radial-gradient(55% 70% at 50% -15%,rgba(45,107,255,.14),transparent 65%)}
.cta .wrap{position:relative}
.cta h2{font-size:clamp(30px,4.6vw,50px)}
.cta .btn-row{justify-content:center;margin-top:28px}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);background:var(--bg2);padding:64px 0 96px}
.fgrid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px}
.fbrand p{font-size:13.5px;color:var(--dim);margin-top:12px;max-width:300px}
.fcol h3{font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--dim);margin-bottom:14px;font-weight:500;line-height:1}
/* screen-reader-only: gives a correct heading outline without a visual change */
.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}
.fcol a{display:block;font-size:14px;color:var(--mut);padding:5px 0;transition:color .2s}
.fcol a:hover{color:var(--text)}
.fbase{display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap;margin-top:48px;padding-top:24px;
  border-top:1px solid var(--line);font-size:12.5px;color:var(--dim)}
.fbase a{color:var(--dim)}.fbase a:hover{color:var(--mut)}

/* ---------- mobile sticky CTA ---------- */
.mcta{display:none}

/* ---------- reveal-on-scroll (progressive: no-JS shows everything) ---------- */
html.js .gs-r{opacity:0;transform:translateY(24px);transition:opacity .7s cubic-bezier(.2,.7,.25,1),transform .7s cubic-bezier(.2,.7,.25,1)}
html.js .gs-r.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){html.js .gs-r{opacity:1;transform:none;transition:none}}

/* ---------- responsive ---------- */
@media(max-width:1020px){
  .grid3,.grid4{grid-template-columns:repeat(2,1fr)}
  .fgrid{grid-template-columns:1fr 1fr}
}
@media(max-width:760px){
  section{padding:76px 0}
  .pagetop{padding:112px 0 8px}
  .nlinks{position:fixed;inset:64px 0 auto 0;background:rgba(8,9,12,.97);backdrop-filter:blur(20px);
    flex-direction:column;align-items:stretch;gap:0;padding:10px 24px 22px;display:none;border-bottom:1px solid var(--line)}
  .nav.open .nlinks{display:flex}
  .nlinks a{padding:14px 2px;font-size:16px;border-bottom:1px solid var(--line)}
  .nlinks a:not(.btn)::after{display:none}
  .nlinks .btn{margin-top:14px;justify-content:center;border-bottom:0}
  .nburger{display:flex}
  .grid2,.grid3,.grid4{grid-template-columns:1fr}
  .fgrid{grid-template-columns:1fr}
  .mcta{display:block;position:fixed;left:0;right:0;bottom:0;z-index:90;padding:10px 14px calc(10px + env(safe-area-inset-bottom));
    background:rgba(8,9,12,.9);backdrop-filter:blur(14px);border-top:1px solid var(--line)}
  .mcta a{display:flex;justify-content:center;align-items:center;gap:8px;background:var(--grad);color:#fff;
    font-weight:700;font-size:15.5px;padding:13px;border-radius:12px}
  footer{padding-bottom:130px}
}