/* YATFA — shared design kit of the site (02.10 etalon, ported from yatfa-site-2026-10-02/site/assets/y.css).
   Dark base; light and material only on evidence carriers; the product in frame is the light theme (ui.css).
   --ink3 is #80858e here, not the etalon's #6b7078: the etalon value measures under AA 4.5:1 for the small text it
   colours; the live homepage already carried the raised value (roadmap YATFA-10211 conflict 1). */
:root{
  --bg:#0a0b0d;--bg2:#0d0e11;--surface:#141519;--surface2:#1a1c21;
  --line:rgba(255,255,255,.09);--line2:rgba(255,255,255,.15);
  --ink:#f4f5f7;--ink2:#a2a7b0;--ink3:#80858e;--ink4:#4a4f57;
  --acc:#8194dd;--acc2:#9fb0ff;--accd:#3c5099;--blue:#2650dc;
  --ok:#7fd8a8;--warn:#e9bd73;--bad:#f08a8a;
  --ease:cubic-bezier(.2,.7,.2,1);--ease2:cubic-bezier(.65,0,.35,1);
  --r:18px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{background:var(--bg);color:var(--ink);font-family:"Plus Jakarta Sans",-apple-system,"Segoe UI",sans-serif;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;position:relative}
body::after{content:"";position:fixed;inset:0;pointer-events:none;z-index:60;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.05'/%3E%3C/svg%3E")}
a{color:inherit}
img,svg,video{display:block;max-width:100%}
em{font-style:italic;font-weight:300}
.wrap{max-width:1180px;margin:0 auto;padding:0 28px}
.wrap.n{max-width:980px}
.wrap.w{max-width:1320px}
.mono{font-family:ui-monospace,"SF Mono",Menlo,monospace}
.muted{color:var(--ink2)}.dim{color:var(--ink3)}

/* ------- header + mega-menu ------- */
.nav{position:fixed;z-index:50;top:0;left:0;right:0;background:rgba(10,11,13,.62);border-bottom:1px solid var(--line);
  backdrop-filter:blur(14px) saturate(1.2);-webkit-backdrop-filter:blur(14px) saturate(1.2)}
.navin{max-width:1260px;margin:0 auto;height:68px;padding:0 28px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center}
.navin .logo{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:.02em;color:var(--ink);text-decoration:none;font-size:17px}
.navin .logo img{width:26px;height:26px}
.links{display:flex;gap:4px;justify-self:center}
.dd{position:relative}
.dd>button,.links>a{background:none;border:0;cursor:pointer;color:var(--ink2);font:500 15px/1 "Plus Jakarta Sans",sans-serif;
  padding:10px 14px;border-radius:10px;text-decoration:none;display:flex;align-items:center;gap:6px;transition:color .2s,background .2s}
.dd>button::after{content:"";width:6px;height:6px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg) translateY(-2px);opacity:.7}
.dd:hover>button,.dd.open>button,.links>a:hover,.links>a.here,.dd.here>button{color:var(--ink);background:rgba(255,255,255,.05)}
.right{justify-self:end;display:flex;align-items:center;gap:22px}
.right a{color:var(--ink2);text-decoration:none;font-size:15px}
.right a:hover{color:var(--ink)}
.right .cta{color:#0a0b0d;background:#fff;padding:11px 20px;border-radius:999px;font-weight:600}
.right .cta:hover{color:#0a0b0d;background:#e9ecf5}
.panel{position:absolute;top:calc(100% + 12px);left:50%;transform:translateX(-50%) translateY(6px);opacity:0;pointer-events:none;
  transition:opacity .18s ease,transform .18s ease;border:1px solid var(--line);border-radius:20px;background:#0e0f12;box-shadow:0 40px 80px rgba(0,0,0,.55)}
.dd.open .panel,.dd:focus-within .panel{opacity:1;transform:translateX(-50%) translateY(0);pointer-events:auto}
.dd .panel::before{content:"";position:absolute;left:0;right:0;top:-28px;height:28px}
.navin{position:relative}
.dd.dd-mega{position:static}
.dd-mega .panel{top:calc(100% - 6px);width:min(1000px,calc(100vw - 32px))}
.panel.mega{width:1000px;overflow:hidden}
.mega .mwrap{display:grid;grid-template-columns:1fr 300px;gap:10px;padding:22px 22px 14px}
.mega .mlinks{display:grid;grid-template-columns:repeat(3,1fr);gap:0 26px;padding:0 12px}
.mega .col h5,.cols2 .col h5{margin:12px 0 6px;font:600 11px/1 ui-monospace,monospace;letter-spacing:.16em;color:var(--ink3);text-transform:uppercase}
.mega .col a,.cols2 .col a{display:block;padding:8px 0;color:var(--ink2);font-size:14.5px;text-decoration:none;transition:color .15s}
.mega .col a:hover,.mega .col a.hot,.cols2 .col a:hover{color:var(--ink)}
.mega .mprev{border-radius:14px;background:#101216;border:1px solid rgba(255,255,255,.06);padding:14px;align-self:start}
.mprev .art{position:relative;height:150px;border-radius:10px;margin-bottom:12px;overflow:hidden;background:radial-gradient(120% 140% at 50% 0%,#141a33 0%,#0b0c0f 70%)}
.mprev .pa{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;opacity:0;transform:translateY(6px) scale(.98);transition:opacity .25s ease,transform .25s ease}
.mprev .pa.on{opacity:1;transform:none}
.mprev .pa svg{width:100%;height:100%}
.mprev b{display:block;font-size:15px;font-weight:600;color:var(--ink)}
.mprev small{display:block;margin-top:5px;color:var(--ink3);font-size:13px;line-height:1.5;min-height:39px}
.mega .strip{border-top:1px solid var(--line);padding:16px;text-align:center;background:rgba(255,255,255,.02)}
.mega .strip a{color:var(--ink);font-size:14.5px;text-decoration:none}
.panel.small{min-width:460px;max-width:580px;padding:12px 30px 22px}
.cols2{display:grid;grid-template-columns:1fr 1fr;gap:0 40px}
.burger{display:none;background:none;border:1px solid var(--line2);border-radius:10px;width:40px;height:40px;color:var(--ink);font-size:18px}
.mnav{display:none}
@media(max-width:980px){
  .links,.right a:not(.cta){display:none}
  .navin{grid-template-columns:1fr auto auto;gap:12px}
  .burger{display:block}
  .mnav.open{display:block;position:fixed;top:68px;left:0;right:0;bottom:0;background:#0b0c0f;overflow:auto;padding:12px 24px 40px;z-index:49}
  .mnav details{border-bottom:1px solid var(--line);padding:14px 0}
  .mnav summary{font-weight:600;font-size:17px;list-style:none;cursor:pointer}
  .mnav summary::-webkit-details-marker{display:none}
  .mnav a{display:block;padding:9px 0 9px 4px;color:var(--ink2);text-decoration:none}
  .mnav h5{margin:12px 0 4px;font:600 11px/1 ui-monospace,monospace;letter-spacing:.16em;color:var(--ink3);text-transform:uppercase}
}

/* ------- typography ------- */
.h1{font-size:clamp(42px,6.2vw,84px);font-weight:300;line-height:1.03;letter-spacing:-.03em}
.h1 em,.h2 em{color:#fff}
.h2{font-size:clamp(30px,3.7vw,50px);font-weight:300;line-height:1.1;letter-spacing:-.02em}
.h3{font-size:clamp(22px,2.1vw,28px);font-weight:500;line-height:1.22;letter-spacing:-.012em}
.h4{font-size:18px;font-weight:600;line-height:1.35;letter-spacing:-.005em}
.lead{font-size:clamp(17px,1.5vw,19.5px);line-height:1.6;color:var(--ink2);font-weight:300}
.body{font-size:16px;line-height:1.65;color:var(--ink2)}
.small{font-size:13.5px;line-height:1.55;color:var(--ink3)}
.center{text-align:center}
.center .lead{margin-left:auto;margin-right:auto}
.crumb{display:none!important;gap:8px;align-items:center;font:500 13px/1 "Plus Jakarta Sans";color:var(--ink3);text-decoration:none}
.crumb a{text-decoration:none;color:var(--ink3)}.crumb a:hover{color:var(--ink2)}
.crumb i{font-style:normal;opacity:.5}

/* ------- buttons ------- */
.btn{display:inline-flex;align-items:center;gap:10px;border-radius:999px;font:600 16px/1 "Plus Jakarta Sans";text-decoration:none;cursor:pointer;
  padding:17px 30px;border:1px solid transparent;transition:transform .25s var(--ease),background .2s,border-color .2s,color .2s}
.btn-w{background:#fff;color:#0a0b0d}.btn-w:hover{background:#e9ecf5;transform:translateY(-1px)}
.btn-o{background:transparent;border-color:rgba(255,255,255,.25);color:var(--ink);font-weight:500}.btn-o:hover{border-color:rgba(255,255,255,.5)}
.btn-s{padding:12px 20px;font-size:14.5px}
.btn-t{color:var(--ink2);font-size:15px;text-decoration:none;display:inline-flex;gap:8px;align-items:center;transition:color .2s}
.btn-t:hover{color:var(--ink)}
.btn-t span{transition:transform .25s var(--ease)}.btn-t:hover span{transform:translateX(3px)}
.btnrow{display:flex;gap:16px;align-items:center;flex-wrap:wrap}
.center .btnrow{justify-content:center}

/* ------- sections ------- */
.sec{padding:130px 0;position:relative}
.sec.t{padding-top:40px}
.sec.b0{padding-bottom:40px}
.sec-h{max-width:860px;margin:0 auto;text-align:center}
.sec-h .lead{margin:22px auto 0;max-width:700px}
.sec-h.l{margin:0;text-align:left}.sec-h.l .lead{margin-left:0}
.divider{max-width:1180px;margin:0 auto;border-top:1px solid var(--line)}
.glowbg{position:absolute;inset:0;pointer-events:none;overflow:hidden}
.glowbg::before{content:"";position:absolute;left:50%;top:0;width:1100px;height:600px;transform:translateX(-50%);
  background:radial-gradient(50% 50% at 50% 30%,rgba(60,80,153,.22),transparent 70%)}

/* feature-page hero */
.fhero{position:relative;padding:150px 0 0;text-align:center;overflow:hidden}
.fhero::before{content:"";position:absolute;left:50%;top:-240px;width:1400px;height:900px;transform:translateX(-50%);pointer-events:none;
  background:radial-gradient(40% 45% at 50% 40%,rgba(58,86,200,.28),rgba(58,86,200,.06) 55%,transparent 72%)}
.fhero .crumb{margin-bottom:26px}
.fhero .h1{max-width:980px;margin:0 auto}
.fhero .lead{max-width:720px;margin:26px auto 0}
.fhero .btnrow{margin-top:38px;justify-content:center}
.stage3d{perspective:1800px;margin-top:72px}
.tilt{transform-origin:50% 0;transform:rotateX(14deg) scale(.94);transition:transform .1s linear;will-change:transform}
.fade-b{position:relative}
.fade-b::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:110px;background:linear-gradient(180deg,transparent,var(--bg));pointer-events:none}

/* split: text + visual */
.split{display:grid;grid-template-columns:1fr 1.25fr;gap:72px;align-items:center}
.split.rev{grid-template-columns:1.25fr 1fr}
.split.rev>.txt{order:2}
.split .txt .h3,.split .txt .h2{margin-bottom:18px}
.split .txt .body+.body{margin-top:14px}
.split .txt .btn-t{margin-top:24px}
.pts{list-style:none;margin-top:22px;display:grid;gap:12px}
.pts li{display:grid;grid-template-columns:18px 1fr;gap:12px;font-size:15.5px;line-height:1.55;color:var(--ink2)}
.pts li::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--acc);margin-top:9px;box-shadow:0 0 0 4px rgba(129,148,221,.14)}
.pts li b{color:var(--ink);font-weight:600}

/* sticky story: steps on the left, scene on the right */
.story{display:grid;grid-template-columns:.9fr 1.3fr;gap:64px;align-items:start}
.story .steps{display:flex;flex-direction:column}
.story .step{padding:34vh 0 34vh;opacity:.28;transition:opacity .45s var(--ease)}
.story .step:first-child{padding-top:10vh}.story .step:last-child{padding-bottom:28vh}
.story .step.on{opacity:1}
.story .step .n{font:500 15px/1 "Plus Jakarta Sans";color:var(--acc2);margin-bottom:14px}
.story .step .h3{margin-bottom:14px}
.story .pin{position:sticky;top:calc(50vh - 230px);height:460px}

/* auto-tabs (switch by themselves, with progress) */
.atabs{display:grid;grid-template-columns:.85fr 1.4fr;gap:56px;align-items:center}
.atabs .tl{display:flex;flex-direction:column;gap:4px}
.atab{position:relative;text-align:left;background:none;border:0;color:inherit;cursor:pointer;padding:20px 22px 20px 26px;border-radius:14px;transition:background .3s}
.atab::before{content:"";position:absolute;left:0;top:18px;bottom:18px;width:2px;background:rgba(255,255,255,.1);border-radius:2px}
.atab i{position:absolute;left:0;top:18px;width:2px;height:0;background:var(--acc);border-radius:2px;box-shadow:0 0 12px var(--acc)}
.atab b{display:block;font:500 19px/1.3 "Plus Jakarta Sans";color:var(--ink3);transition:color .3s}
.atab span{display:block;max-height:0;overflow:hidden;opacity:0;font-size:15px;line-height:1.6;color:var(--ink2);transition:max-height .5s var(--ease),opacity .4s,margin .4s}
.atab.on{background:rgba(255,255,255,.03)}
.atab.on b{color:var(--ink)}
.atab.on span{max-height:180px;opacity:1;margin-top:10px}
.atab:hover b{color:var(--ink2)}.atab.on:hover b{color:var(--ink)}

/* bento */
.bento{display:grid;grid-template-columns:repeat(6,1fr);gap:16px}
.bx{position:relative;border:1px solid var(--line);border-radius:var(--r);background:linear-gradient(180deg,#131419,#0f1013);overflow:hidden;
  padding:28px;display:flex;flex-direction:column;min-height:300px;isolation:isolate}
.bx::before{content:"";position:absolute;inset:0;z-index:-1;opacity:0;transition:opacity .35s;
  background:radial-gradient(420px 260px at var(--mx,50%) var(--my,0%),rgba(129,148,221,.14),transparent 70%)}
.bx:hover::before{opacity:1}
.bx:hover{border-color:rgba(255,255,255,.14)}
.bx .h4{margin-top:auto;padding-top:22px}
.bx .small{margin-top:8px;color:var(--ink2);font-size:14.5px}
.bx .vis{flex:1;min-height:150px;display:flex;align-items:center;justify-content:center;position:relative}
.c2{grid-column:span 2}.c3{grid-column:span 3}.c4{grid-column:span 4}.c6{grid-column:span 6}

/* statistics */
.stats{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:rgba(255,255,255,.015)}
.stat{padding:34px 32px;position:relative}
.stat+.stat{border-left:1px solid var(--line)}
.stat b{display:block;font:300 clamp(40px,4.4vw,60px)/1 "Plus Jakarta Sans";letter-spacing:-.035em;color:#fff;font-variant-numeric:tabular-nums}
.stat span{display:block;margin-top:14px;font-size:15px;line-height:1.5;color:var(--ink2)}
.stat small{display:block;margin-top:6px;font-size:12.5px;color:var(--ink3)}
.src{margin-top:14px;font-size:12.5px;color:var(--ink3);text-align:center}

/* bridge cards */
.bridges{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.bridges.b3{grid-template-columns:repeat(3,1fr)}
.bridge .b-art{height:118px;margin:-8px -8px 14px;display:flex;align-items:center;justify-content:center;border-radius:14px;background:radial-gradient(60% 80% at 50% 60%,rgba(60,80,153,.22),transparent 75%);transition:transform .5s var(--ease)}
.bridge .b-art svg{height:118px;width:auto}
.bridge:hover .b-art{transform:translateY(-3px) scale(1.03)}
.bridge{display:flex;flex-direction:column;gap:10px;padding:30px;border:1px solid var(--line);border-radius:var(--r);text-decoration:none;
  background:linear-gradient(180deg,#121317,#0e0f12);transition:border-color .25s,transform .35s var(--ease)}
.bridge:hover{border-color:rgba(255,255,255,.2);transform:translateY(-3px)}
.bridge small{display:none}
.xh{margin:30px auto 44px}
.bridge b{font:500 23px/1.25 "Plus Jakarta Sans";letter-spacing:-.01em}
.bridge span{color:var(--ink2);font-size:15px;line-height:1.55}
.bridge .go{margin-top:auto;padding-top:12px;color:var(--acc2);font-size:14.5px}

/* final band */
.final{padding:170px 24px 150px;text-align:center;position:relative;overflow:hidden}
.final::before{content:"";position:absolute;left:50%;bottom:-300px;width:1200px;height:600px;transform:translateX(-50%);
  background:radial-gradient(50% 50% at 50% 50%,rgba(58,86,200,.18),transparent 70%);pointer-events:none}
.final .h2{max-width:900px;margin:0 auto;font-size:clamp(32px,4vw,56px)}
.final .q{display:block;font-size:clamp(90px,10vw,140px);line-height:.55;height:.45em;color:rgba(125,150,255,.6);font-weight:300;margin-bottom:26px;font-family:Georgia,serif}
.final .line2{display:block;margin-top:8px;color:var(--ink2)}
.final .btnrow{margin-top:52px;justify-content:center}
.final .under{display:block;margin-top:20px;color:var(--ink3);font-size:15px;text-decoration:none}
.final .under:hover{color:var(--ink2)}

/* footer */
.sep{max-width:1180px;margin:0 auto;border-top:1px solid rgba(255,255,255,.08)}
footer.foot{max-width:1180px;margin:0 auto;padding:56px 28px 40px;display:grid;grid-template-columns:1.4fr repeat(var(--cols,4),1fr);gap:32px}
footer.foot .brand p{margin-top:14px;color:var(--ink3);font-size:13.5px;line-height:1.5;max-width:24ch}
footer.foot h6{font:600 11px/1 ui-monospace,monospace;letter-spacing:.16em;color:var(--ink3);text-transform:uppercase;margin-bottom:12px}
footer.foot a{display:block;padding:5px 0;color:var(--ink2);font-size:13.5px;text-decoration:none}
footer.foot a:hover{color:var(--ink)}
.legal{max-width:1180px;margin:0 auto;padding:0 28px 36px;color:var(--ink3);font-size:12.5px}

/* reveal */
[data-r]{opacity:0;transform:translateY(22px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
[data-r].in{opacity:1;transform:none}
[data-r="2"]{transition-delay:.08s}[data-r="3"]{transition-delay:.16s}[data-r="4"]{transition-delay:.24s}[data-r="5"]{transition-delay:.32s}
@media (prefers-reduced-motion:reduce){[data-r]{opacity:1;transform:none;transition:none}.tilt{transform:none!important}}

/* source captions for evidence */
.proofline{display:flex;gap:10px;align-items:center;justify-content:center;margin-top:18px;font-size:12.5px;color:var(--ink3)}
.proofline i{width:6px;height:6px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 4px rgba(127,216,168,.12);animation:pl 2.4s ease-in-out infinite}
@keyframes pl{50%{box-shadow:0 0 0 7px rgba(127,216,168,.04)}}

/* FAQ */
.faq{max-width:860px;margin:0 auto}
.faq details{border-bottom:1px solid var(--line);padding:22px 0}
.faq summary{list-style:none;cursor:pointer;font:500 18px/1.4 "Plus Jakarta Sans";display:flex;justify-content:space-between;gap:20px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--ink3);font-weight:300;font-size:24px;line-height:1;transition:transform .3s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{margin-top:12px;color:var(--ink2);line-height:1.65;font-size:15.5px;max-width:70ch}

/* table (compare/pricing/trust evidence carriers) */
.tbl{width:100%;border-collapse:collapse;font-size:15px}
.tbl th{text-align:left;font:600 11px/1 ui-monospace,monospace;letter-spacing:.14em;text-transform:uppercase;color:var(--ink3);padding:14px 16px;border-bottom:1px solid var(--line2)}
.tbl td{padding:18px 16px;border-bottom:1px solid var(--line);vertical-align:top;color:var(--ink2);line-height:1.55}
.tbl td:first-child{color:var(--ink);font-weight:500}
.tbl a{color:var(--acc2);text-decoration:none;font-size:13px}

/* chip tag without a frame (owner banned badges — mono text only) */
/* owner decision 01.10: no coloured mono-caps eyebrows — labels in the regular font */
.tag{font:500 13px/1.3 "Plus Jakarta Sans";letter-spacing:0;text-transform:none;color:var(--ink3)}

/* logo strip (marquee) */
.marq{overflow:hidden;-webkit-mask-image:linear-gradient(90deg,transparent,#000 10%,#000 90%,transparent);mask-image:linear-gradient(90deg,transparent,#000 10%,#000 90%,transparent)}
.marq .tr{display:flex;gap:14px;width:max-content;animation:mq 60s linear infinite}
.marq:hover .tr{animation-play-state:paused}
@keyframes mq{to{transform:translateX(-50%)}}

@media(max-width:980px){
  .split,.split.rev,.story,.atabs{grid-template-columns:1fr;gap:40px}
  .split.rev>.txt{order:0}
  .story .step{padding:40px 0;opacity:1}
  .story .pin{position:relative;top:0;height:auto}
  .bento{grid-template-columns:1fr}
  .c2,.c3,.c4,.c6{grid-column:auto}
  .stats{grid-template-columns:1fr}
  .stat+.stat{border-left:0;border-top:1px solid var(--line)}
  .bridges,.bridges.b3{grid-template-columns:1fr}
  footer.foot{grid-template-columns:1fr 1fr}
  .sec{padding:90px 0}
  .wrap{padding:0 18px}
  .fhero{padding-top:120px}
}

/* footer brand + social row (production additions to the etalon kit: the footer logo carried inline styles there;
   the social row is the owner decision of roadmap YATFA-10211 — GitHub, Discord, LinkedIn, X) */
footer.foot .brand .logo{display:flex;gap:10px;align-items:center;text-decoration:none;font-weight:800;letter-spacing:.02em;color:var(--ink);padding:0;font-size:17px}
footer.foot .brand .logo img{width:24px;height:24px}
footer.foot .social{display:flex;gap:6px;margin-top:18px;margin-left:-8px}
footer.foot .social a{display:grid;place-items:center;width:36px;height:36px;padding:0;border-radius:10px;color:var(--ink2);cursor:pointer;transition:color .2s,background .2s}
footer.foot .social a:hover,footer.foot .social a:focus-visible{color:var(--ink);background:rgba(255,255,255,.06)}
footer.foot .social svg{width:18px;height:18px}
.legal a{color:inherit}