:root{
  color-scheme:light;
  --black:#111111; --signal:#ED1C24; --graphite:#333333; --grey:#6E6E6E; --silver:#BDBDBD; --light:#F2F2F2; --white:#FFFFFF;
  --ink:var(--black); --mist:var(--light);
  --text:#111111; --text-2:#555555; --text-3:#7A7A7A; --rule:rgba(17,17,17,.12); --rule-strong:rgba(17,17,17,.26);
  --icon:#6E6E6E; --icon-dark:#9A9A9A;
  --on-dark:#ECECEC; --on-dark-2:#B5B5B5; --on-dark-3:#858585; --rule-dark:rgba(255,255,255,.14);
  --f-display:"Space Grotesk","Helvetica Neue",Arial,sans-serif;
  --f-body:"Inter","Helvetica Neue",Arial,sans-serif;
  --f-mono:"IBM Plex Mono",ui-monospace,Menlo,monospace;
  --gutter:clamp(16px,4vw,48px);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
html.splash-on,html.splash-on body{overflow:hidden}
body{margin:0;background:var(--white);color:var(--text);font:400 16px/1.65 var(--f-body);-webkit-font-smoothing:antialiased}
h1,h2,h3,h4{font-family:var(--f-display);font-weight:500;letter-spacing:-.015em;text-wrap:balance;margin:0}
p{margin:0}
a{color:inherit}
:focus-visible{outline:2px solid var(--signal);outline-offset:3px}
.wrap{max-width:1200px;margin-inline:auto;padding-inline:var(--gutter)}
.label{font:500 11.5px/1.4 var(--f-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--text-3)}
.dark .label{color:var(--on-dark-3)}
.logo{display:block;height:auto}
.logo .lg-body{fill:currentColor}
.logo .lg-dot{fill:var(--signal)}
.gl svg{display:block;width:100%;height:auto;fill:currentColor}
.li{display:block;width:100%;height:auto}
.li *{vector-effect:non-scaling-stroke;stroke-width:1.5px}
section{scroll-margin-top:72px}

/* splash */
#splash{position:fixed;inset:0;z-index:100;background:#111111;transition:opacity .9s ease}
#splash.out{opacity:0;pointer-events:none}
#splash canvas{display:block;width:100%;height:100%;cursor:pointer;outline:none}

/* header */
header.site{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:rgba(255,255,255,.94);backdrop-filter:saturate(140%) blur(10px);-webkit-backdrop-filter:saturate(140%) blur(10px);color:var(--text);border-bottom:1px solid var(--rule)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;height:64px}
header.site .logo{width:72px;color:var(--black)}
header.site nav{display:flex;gap:28px;font:400 14px var(--f-body);color:var(--text-2)}
header.site nav a{text-decoration:none}
header.site nav a:hover{color:var(--text)}
.btn{display:inline-flex;align-items:center;gap:10px;font:500 12px/1 var(--f-mono);letter-spacing:.08em;text-transform:uppercase;text-decoration:none;padding:14px 18px;border:1px solid transparent;cursor:pointer}
.btn i{width:7px;height:7px;border-radius:50%;background:var(--signal);display:inline-block}
.btn-primary{background:#fff;color:var(--ink)}
.btn-primary:hover{background:var(--mist)}
.btn-ghost{border-color:var(--rule-dark);color:#fff;background:transparent}
.btn-ghost:hover{border-color:#fff}
.btn-ink{background:var(--ink);color:#fff}
.btn-ink:hover{background:#000}

/* hero */
.hero{background:var(--ink);color:#fff;position:relative;overflow:hidden}
.hero .wrap{position:relative;z-index:1;padding-block:clamp(72px,11vw,140px) clamp(72px,10vw,128px);display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,.75fr);gap:48px;align-items:end}
.hero h1{font-size:clamp(40px,6.2vw,80px);line-height:1;letter-spacing:-.03em}
.hero .lede{font-size:clamp(17px,1.5vw,19px);color:var(--on-dark-2);max-width:52ch;margin-top:24px}
.hero .ctas{display:flex;gap:12px;flex-wrap:wrap;margin-top:36px}
.hero .side{display:flex;flex-direction:column;gap:0;border-top:1px solid var(--rule-dark)}
.stat{display:flex;flex-direction:column;gap:4px;padding:18px 0;border-bottom:1px solid var(--rule-dark)}
.stat b{font:400 clamp(30px,3.4vw,42px)/1 var(--f-mono);letter-spacing:-.03em;color:#fff;font-variant-numeric:tabular-nums}
.stat span{font-size:14px;color:var(--on-dark-2)}
.hero .sky{position:absolute;left:0;right:0;bottom:-2px;color:rgba(238,241,244,.16);pointer-events:none}
.hero .sky svg{display:block;width:100%;height:auto;max-height:52vh}
.hero .glyph-line{display:flex;gap:8px;color:var(--icon-dark);margin-bottom:28px}
.hero .glyph-line .gl{width:12px}
.hero .glyph-line .gl.lit{color:#fff}

/* sections */
.sec{padding-block:clamp(72px,9vw,120px)}
.sec-head{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:24px 48px;align-items:end;margin-bottom:48px}
.sec-head h2{font-size:clamp(30px,3.8vw,48px);line-height:1.06}
.sec-head p{color:var(--text-2);font-size:17px;max-width:56ch}
.dark{background:var(--ink);color:#fff}
.dark .sec-head p{color:var(--on-dark-2)}
.mist{background:var(--mist)}

/* core functions */
.cf{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-top:1px solid var(--rule)}
.cf div{padding:24px 20px 28px 0;border-bottom:1px solid var(--rule);display:flex;flex-direction:column;gap:14px}
.cf div:not(:nth-child(4n)){border-right:1px solid var(--rule);}
.cf div:not(:nth-child(4n+1)){padding-left:20px}
.cf .ico{width:29px;color:var(--icon)}
.cf b{font:500 17px/1.25 var(--f-display)}
.cf .label{color:var(--text-3)}
.note{font-size:14px;color:var(--text-3);margin-top:28px;max-width:72ch}
.callout{margin-top:40px;display:grid;grid-template-columns:auto minmax(0,1fr);gap:20px;align-items:start;padding:24px;border-left:2px solid var(--signal);background:var(--mist)}
.callout b{font:500 20px/1.3 var(--f-display)}
.callout p{color:var(--text-2)}

/* modules */
.modules{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1px;background:var(--rule);border:1px solid var(--rule)}
.mod{background:#fff;padding:28px 24px;display:flex;flex-direction:column;gap:14px;min-height:240px;transition:background .2s}
.mod:hover{background:var(--mist)}
.mod .gl{width:30px;color:var(--icon)}
.mod h3{font-size:20px;line-height:1.2}
.mod p{font-size:14.5px;color:var(--text-2)}
.mod .label{margin-top:auto}

/* how it works */
.flow{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:0;border-top:1px solid var(--rule-dark)}
.step{padding:24px 18px 28px 0;display:flex;flex-direction:column;gap:12px;position:relative}
.step:not(:first-child){padding-left:18px;border-left:1px solid var(--rule-dark)}
.step .ico{width:27px;color:var(--icon-dark)}
.step b{font:500 17px/1.25 var(--f-display);color:#fff}
.step p{font-size:14px;color:var(--on-dark-2)}
.step.check .ico{color:var(--on-dark)}
.step.check b::after{content:"";display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--signal);margin-left:8px;vertical-align:middle}
.atlas{margin-top:40px;display:flex;gap:8px;flex-wrap:wrap;color:#5A5A5A}
.atlas .gl{width:10px}

/* assurance */
.assure{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.2fr);gap:48px;align-items:start}
.equation{display:flex;align-items:center;gap:16px;flex-wrap:wrap;font:500 clamp(22px,2.6vw,32px)/1.2 var(--f-display)}
.equation span.op{color:var(--text-3);font-family:var(--f-mono);font-weight:400}
.equation span.res{border-bottom:2px solid var(--signal)}
.features{display:flex;flex-direction:column;border-top:1px solid var(--rule)}
.feat{display:grid;grid-template-columns:36px minmax(0,1fr);gap:20px;padding:22px 0;border-bottom:1px solid var(--rule)}
.feat .ico{width:31px;color:var(--icon)}
.feat b{font:500 19px/1.3 var(--f-display);display:block;margin-bottom:4px}
.feat p{color:var(--text-2);font-size:15px}

/* pricing */
.price{display:flex;flex-direction:column;gap:28px}
.prow{display:grid;grid-template-columns:220px minmax(0,1fr);gap:24px;align-items:center}
.prow h4{font-size:17px}
.prow .sub{font-size:13.5px;color:var(--text-3)}
.bars{display:flex;flex-direction:column;gap:6px}
.bar{display:flex;align-items:center;gap:12px;font:400 13px var(--f-mono);font-variant-numeric:tabular-nums}
.bar i{display:block;height:14px}
.bar.tac i{background:var(--black)}
.bar.human i{background:transparent;border:1px solid var(--rule-strong);height:14px}
.bar span{color:var(--text-2);white-space:nowrap}
.legend{display:flex;gap:24px;flex-wrap:wrap;font:400 13px var(--f-body);color:var(--text-2)}
.legend i{display:inline-block;width:14px;height:10px;margin-right:8px;vertical-align:middle}
.tiers{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:40px}
.tier{border:1px solid var(--rule);padding:24px;display:flex;flex-direction:column;gap:8px;background:#fff}
.tier h4{font-size:20px}
.tier p{color:var(--text-2);font-size:15px}

/* contact */
.contact{background:var(--light);color:var(--text);position:relative;overflow:hidden}
.contact .pat{position:absolute;inset:0;display:grid;grid-template-columns:repeat(24,1fr);gap:26px;padding:26px;color:rgba(17,17,17,.07);pointer-events:none;align-content:start}
.contact .pat .gl{width:100%}
.contact .wrap{position:relative;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:48px;align-items:start}
.contact h2{font-size:clamp(30px,3.8vw,48px);line-height:1.06}
.contact p.lede{color:var(--text-2);font-size:17px;margin-top:18px;max-width:46ch}
form.cform{background:var(--ink);padding:28px;display:flex;flex-direction:column;gap:16px}
.field{display:flex;flex-direction:column;gap:6px}
.field label{font:500 11px/1.4 var(--f-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--on-dark-3)}
.field input,.field select{font:400 15px var(--f-body);color:#fff;background:transparent;border:0;border-bottom:1px solid var(--rule-dark);padding:10px 0;border-radius:0}
.field select option{color:#111111}
.field input:focus,.field select:focus{outline:none;border-bottom-color:#fff}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.cform .btn{align-self:flex-start;margin-top:8px}
.cform .msg{font-size:14px;color:var(--on-dark-2)}

/* footer */
footer.site{background:var(--ink);color:var(--on-dark-2);position:relative;overflow:hidden}
footer.site .wrap{position:relative;z-index:1;padding-block:56px 40px;display:grid;grid-template-columns:minmax(0,1.4fr) repeat(3,minmax(0,1fr));gap:32px}
footer.site .logo{width:110px;color:#fff}
footer.site p{font-size:14px;margin-top:16px;max-width:36ch}
footer.site h4{font:500 11px/1.4 var(--f-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--on-dark-3);margin-bottom:12px}
footer.site ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px;font-size:14px}
footer.site a{text-decoration:none}
footer.site a:hover{color:#fff}
footer.site .sky{position:absolute;left:0;right:0;bottom:-2px;color:rgba(238,241,244,.12)}
footer.site .sky svg{display:block;width:100%;height:auto}
footer.site .legal{grid-column:1/-1;border-top:1px solid var(--rule-dark);padding-top:20px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--on-dark-3)}

@media (max-width:960px){
  header.site nav{display:none}
  .hero .wrap,.sec-head,.assure,.contact .wrap{grid-template-columns:minmax(0,1fr)}
  .cf,.modules{grid-template-columns:repeat(2,minmax(0,1fr))}
  .cf div:not(:nth-child(4n)){border-right:0}
  .cf div{padding-left:0!important;padding-right:16px}
  .cf div:nth-child(odd){border-right:1px solid var(--rule)}
  .cf div:nth-child(even){padding-left:16px!important}
  .flow{grid-template-columns:repeat(2,minmax(0,1fr))}
  .step{border-left:0!important;padding-left:0!important;border-bottom:1px solid var(--rule-dark)}
  .prow{grid-template-columns:minmax(0,1fr);gap:10px}
  footer.site .wrap{grid-template-columns:1fr 1fr}
  .contact .pat{grid-template-columns:repeat(12,1fr)}
}
@media (max-width:560px){
  .cf,.modules,.tiers,.row2{grid-template-columns:minmax(0,1fr)}
  .cf div:nth-child(n){border-right:0!important;padding-left:0!important}
  .flow{grid-template-columns:minmax(0,1fr)}
  header.site .btn{display:none}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}

/* v2 additions. Same tokens as v1 (prototype.css above). */
.skip{position:absolute;left:-999px}
.skip:focus{left:16px;top:8px;background:#fff;padding:8px;z-index:30}
header.site nav a[aria-current]{color:var(--text)}
.hero.sub .wrap{padding-block:clamp(56px,8vw,96px);align-items:center}
.hero.sub h1{font-size:clamp(34px,5vw,64px)}
.hero .side.bigglyph{border:0;display:flex;justify-content:flex-end;color:var(--icon-dark)}
.hero .side.bigglyph .gl{width:min(220px,30vw)}
/* module hero illustration: an opaque white illustration sits on a white card at the right */
.hero.sub.haspic .wrap{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
.hero .side.pic{border:0;display:flex;justify-content:flex-end}
.hero .side.pic img{display:block;width:100%;max-width:560px;height:auto;border-radius:12px;background:#fff}
@media (max-width:760px){.hero .side.pic{justify-content:flex-start}.hero .side.pic img{max-width:420px}}
.proof{border-bottom:1px solid var(--rule);background:#fff}
.proof .wrap{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0}
.proof div{padding:22px 20px 22px 0;display:flex;flex-direction:column;gap:4px}
.proof div:not(:nth-child(3n+1)){padding-left:20px;border-left:1px solid var(--rule)}
.proof div:nth-child(n+4){border-top:1px solid var(--rule)}
.proof b{font:400 clamp(24px,2.6vw,34px)/1 var(--f-mono);letter-spacing:-.03em;font-variant-numeric:tabular-nums}
.proof span{font-size:14px;color:var(--text-2)}
.flow.four{grid-template-columns:repeat(4,minmax(0,1fr))}
.flow.light{border-top-color:var(--rule)}
.flow.light .step:not(:first-child){border-left-color:var(--rule)}
.flow.light .step b{color:var(--text)}
.flow.light .step p{color:var(--text-2)}
.flow.light .step .ico{color:var(--icon)}
.datarules{margin-top:36px;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;border-top:1px solid var(--rule-dark);padding-top:24px}
.datarules p{font-size:14.5px;color:var(--on-dark-2)}
.screens{margin-top:48px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.screen{margin:0}
.screen .shot{aspect-ratio:16/9;background:var(--mist);border:1px dashed var(--rule-strong);display:grid;place-items:center}
.screen figcaption{margin-top:12px}
.screen figcaption b{font:500 17px/1.3 var(--f-display);display:block}
.screen figcaption p{font-size:14px;color:var(--text-2)}
.banks{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1px;background:var(--rule);border:1px solid var(--rule)}
.banks li{background:#fff;padding:14px 16px;font-size:14.5px}
.modules.three{grid-template-columns:repeat(3,minmax(0,1fr))}
.tiers.four{grid-template-columns:repeat(4,minmax(0,1fr))}
.tiers.three{grid-template-columns:repeat(3,minmax(0,1fr))}
a.tier,a.mod{text-decoration:none;color:inherit}
a.tier:hover{border-color:var(--rule-strong)}
.feat .ico.num{font:400 13px var(--f-mono);color:var(--text-3);padding-top:6px}
.callout .label.null{color:var(--signal)}
.roles{margin-top:40px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;border-top:1px solid var(--rule);padding-top:24px}
.roles p{font-size:15px;color:var(--text-2);margin-top:6px}
.cta{background:var(--ink);color:#fff}
.cta .wrap{display:flex;justify-content:space-between;align-items:center;gap:32px;flex-wrap:wrap}
.cta h2{font-size:clamp(26px,3vw,40px);line-height:1.1}
.cta p{color:var(--on-dark-2);margin-top:10px;max-width:52ch}
.cta .btn-ink{background:#fff;color:var(--ink)}
.prose p{color:var(--text-2);font-size:16.5px;max-width:60ch}
.prose p+p{margin-top:16px}
mark.verify{background:#FFF3B0;color:#5a4a00;padding:0 4px;outline:1px dashed #C9A400}
mark.verify::before{content:"VERIFY · ";font:500 10px var(--f-mono);letter-spacing:.08em}
@media (max-width:960px){.proof .wrap,.flow.four,.banks,.modules.three{grid-template-columns:repeat(3,minmax(0,1fr))}
.tiers.four{grid-template-columns:repeat(2,minmax(0,1fr))}.datarules,.roles,.tiers.three,.screens{grid-template-columns:minmax(0,1fr)}.proof div{border-left:0!important;padding-left:0!important}}
@media (max-width:560px){.proof .wrap,.flow.four,.banks,.modules.three{grid-template-columns:repeat(3,minmax(0,1fr))}
.tiers.four{grid-template-columns:minmax(0,1fr)}}

/* home hero: the circuit-board animation replaces the stat column */
.hero.hasvideo .wrap{grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);align-items:center}
.hero.hasvideo h1{font-size:clamp(38px,5.2vw,68px)}
.hero .side.video{border:0}
.hero .side.video video{display:block;width:100%;height:auto;border:1px solid var(--rule-dark);border-radius:8px;background:#0b0c0c}
@media (prefers-reduced-motion:reduce){.hero .side.video video{display:none}.hero .side.video{background:url(video/tac-circuit-poster.jpg) center/cover no-repeat;aspect-ratio:1280/850;border-radius:8px}}
@media (max-width:860px){.hero.hasvideo .wrap{grid-template-columns:minmax(0,1fr)}.hero.hasvideo h1{font-size:clamp(36px,9vw,56px)}}

/* ---- phones (2026-10-22): menu button, stacked module hero, two-column proof strip ---- */
header.site .menu{display:none}
header.site .navcta{display:none}
@media (max-width:960px){
  header.site .wrap{position:relative}
  header.site > .wrap > .btn{display:none}
  header.site .menu{display:inline-flex;align-items:center;gap:10px;margin-left:auto;background:transparent;border:1px solid var(--rule-strong);color:var(--text);font:500 12px/1 var(--f-mono);letter-spacing:.08em;text-transform:uppercase;padding:12px 14px;min-height:44px;cursor:pointer}
  header.site .menu .bars{display:inline-flex;flex-direction:column;gap:3px;width:16px}
  header.site .menu .bars i{display:block;height:2px;background:currentColor;transition:transform .2s,opacity .2s}
  header.site.open .menu .bars i:nth-child(1){transform:translateY(5px) rotate(45deg)}
  header.site.open .menu .bars i:nth-child(2){opacity:0}
  header.site.open .menu .bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg)}
  header.site.open nav{display:flex;flex-direction:column;gap:0;position:absolute;left:0;right:0;top:100%;background:#fff;border-bottom:1px solid var(--rule);padding:8px var(--gutter) 20px;box-shadow:0 12px 24px rgba(17,17,17,.08)}
  header.site.open nav a{padding:14px 0;border-bottom:1px solid var(--rule);font-size:17px;color:var(--text)}
  header.site.open nav .navcta{display:block;margin-top:16px;border:0;background:var(--ink);color:#fff;text-align:center;font:500 12px/1 var(--f-mono);letter-spacing:.08em;text-transform:uppercase;padding:16px}
  .hero.sub.haspic .wrap{grid-template-columns:minmax(0,1fr)}
  .hero .side.pic{justify-content:flex-start}
  .hero .side.pic img{max-width:100%}
}
@media (max-width:560px){
  .proof .wrap{grid-template-columns:repeat(2,minmax(0,1fr));column-gap:16px}
  .proof div:nth-child(n+3){border-top:1px solid var(--rule)}
  .modules.three,.flow.four{grid-template-columns:minmax(0,1fr)}
  .banks{grid-template-columns:repeat(2,minmax(0,1fr))}
  .proof div{padding:18px 0!important}
  .hero .ctas .btn{white-space:nowrap}
}

/* Related modules on a module page: names only, so no description repeats (Julian 2026-10-22) */
.modules.compact .mod{min-height:0}
.modules.five{grid-template-columns:repeat(5,minmax(0,1fr))}
@media (max-width:960px){.modules.five{grid-template-columns:repeat(2,minmax(0,1fr))}}
/* Why I built TAC (home, 2026-10-22) */
.founder .story p{font-size:17px;color:var(--text-2);margin:0 0 14px}
.founder .story .sign{font:500 12px/1.4 var(--f-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--text);margin-top:20px}
.founder .sec-head{align-items:start}