/* TWVY — homepage v2: the question page.
   A dark, single-screen composition in the register of the brain mockup
   Stevens approved 2026-10-19. The conversation is no longer the front
   door; it is a door. This sheet is loaded only by index.html and is
   fully self-contained so the rest of the (light) lab is untouched. */
:root{
  --hv-bg:#020409;
  --hv-ink:#F2F4FA;
  --hv-body:#B7BED2;
  --hv-mut:#8A93AC;
  --hv-faint:#6B7354;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body.hv{
  background:#020409;
  color:#F2F4FA;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
  line-height:1.5;
  overflow-x:hidden;
}
body.hv a{color:inherit;text-decoration:none}
body.hv ::selection{background:#7C6CF0;color:#fff}
body.hv a:focus-visible{outline:2px solid #9D8BFF;outline-offset:3px;border-radius:6px}

/* ---------- stage ---------- */
.hv-stage{
  position:relative;
  min-height:100vh;
  display:flex;
  flex-direction:column;
  overflow:hidden;
  background:
    radial-gradient(1100px 620px at 62% 30%, rgba(64,52,160,.20), rgba(64,52,160,0) 62%),
    radial-gradient(820px 520px at 88% 78%, rgba(24,78,140,.14), rgba(24,78,140,0) 60%),
    radial-gradient(700px 500px at 8% 88%, rgba(90,40,130,.10), rgba(90,40,130,0) 60%),
    #020409;
}
.hv-brain{
  position:absolute;
  z-index:0;
  width:min(740px,52vw);
  right:15.5%;
  top:9.5%;
  pointer-events:none;
  user-select:none;
}
.hv-brain-m{display:none}

/* ---------- nav ---------- */
.hv-nav{
  position:relative;
  z-index:5;
  display:flex;
  align-items:center;
  padding:26px 46px 6px;
  max-width:1600px;
  width:100%;
  margin:0 auto;
}
.hv-brand{display:flex;align-items:center;gap:15px;font-size:12.5px;font-weight:600;letter-spacing:.34em;white-space:nowrap}
.hv-brand::before{content:"";width:36px;height:1px;background:rgba(230,236,250,.55)}
.hv-links{
  position:absolute;left:50%;transform:translateX(-50%);
  display:flex;gap:44px;
  font-size:12px;font-weight:550;letter-spacing:.2em;
}
.hv-links a{color:#9AA3BC;padding:6px 2px;transition:color .2s}
.hv-links a:hover{color:#fff}
.hv-links a[aria-current]{color:#fff}
.hv-explore{
  margin-left:auto;
  font-size:11.5px;font-weight:600;letter-spacing:.2em;
  border:1px solid rgba(232,238,252,.42);
  padding:11px 24px;border-radius:999px;
  transition:background .2s,color .2s,border-color .2s;
  white-space:nowrap;
}
.hv-explore:hover{background:#F4F6FF;color:#05070D;border-color:#F4F6FF}

/* ---------- main ---------- */
.hv-main{
  position:relative;
  z-index:2;
  flex:1;
  width:100%;
  max-width:1600px;
  margin:0 auto;
  display:grid;
  grid-template-columns:minmax(440px,600px) 1fr;
  padding:2vh 46px 0;
}
.hv-copy{padding-top:6.5vh;max-width:600px}
.hv-eyebrow{font-size:11.5px;font-weight:600;letter-spacing:.3em;color:#A7B0C8}
.hv-copy h1{
  margin-top:26px;
  font-size:clamp(44px,4.7vw,70px);
  font-weight:300;
  line-height:1.07;
  letter-spacing:.004em;
  color:#F5F7FC;
}
.hv-grad{
  background:linear-gradient(94deg,#A78BFA 0%,#C084FC 42%,#7FB2FF 100%);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:transparent;
}
.hv-sub{
  margin-top:27px;
  font-size:16.5px;
  font-weight:350;
  line-height:1.58;
  color:#B7BED2;
  max-width:415px;
}
.hv-doors{margin-top:40px;display:flex;gap:14px;flex-wrap:wrap}
.hv-door{
  display:inline-flex;align-items:center;gap:11px;
  padding:16px 30px;border-radius:999px;
  font-size:12px;font-weight:650;letter-spacing:.17em;
  transition:transform .2s,box-shadow .2s,background .2s,border-color .2s;
  white-space:nowrap;
}
.hv-door .arr{font-weight:400;letter-spacing:0}
.hv-door.primary{background:#F4F6FF;color:#05070D;box-shadow:0 0 0 rgba(157,139,255,0)}
.hv-door.primary:hover{transform:translateY(-1px);box-shadow:0 8px 34px rgba(140,120,255,.35)}
.hv-door.secondary{
  border:1px solid rgba(232,238,252,.38);color:#EDF0FA;
  background:rgba(9,13,26,.28);
}
.hv-door.secondary:hover{border-color:rgba(232,238,252,.75);transform:translateY(-1px)}
.hv-scroll{
  position:absolute;left:46px;bottom:152px;z-index:2;
  display:flex;align-items:flex-end;gap:13px;color:#77809A;
}
.hv-scroll .track{position:relative;width:1px;height:46px;background:rgba(200,210,235,.22)}
.hv-scroll .track::after{
  content:"";position:absolute;left:-2.5px;bottom:0;width:6px;height:6px;border-radius:50%;
  background:#D8DEEE;
}
.hv-scroll span{font-size:9.5px;font-weight:600;letter-spacing:.26em;line-height:1.9}

/* ---------- callouts ---------- */
.hv-calls{
  display:flex;flex-direction:column;justify-content:center;align-items:flex-end;
  gap:3.6vh;padding:2vh 4px 1vh 0;
}
.hv-call{position:relative;width:212px}
.hv-call .dot{
  position:absolute;top:3px;left:-104px;
  width:11px;height:11px;border-radius:50%;
  border:1.5px solid var(--c);
  background:rgba(2,4,9,.6);
}
.hv-call::before{
  content:"";position:absolute;top:8px;left:calc(-104px + 15px);
  width:calc(var(--lw,86px) - 15px);height:1px;
  background:linear-gradient(90deg,transparent,var(--cl));
}
.hv-call h3{font-size:12px;font-weight:650;letter-spacing:.26em;color:var(--c);margin-bottom:7px}
.hv-call p{font-size:13px;line-height:1.52;color:#A9B1C7;max-width:186px}

/* ---------- stat strip ---------- */
.hv-strip{
  position:relative;z-index:2;
  margin-top:4vh;
  border-top:1px solid rgba(165,180,220,.16);
  background:rgba(3,5,12,.55);
}
.hv-strip-in{
  max-width:1600px;margin:0 auto;
  display:grid;grid-template-columns:1.25fr 1fr 1fr 1fr;
  padding:27px 46px 31px;
}
.hv-stat{padding:2px 30px 2px 0}
.hv-stat + .hv-stat{border-left:1px solid rgba(165,180,220,.16);padding-left:34px}
.hv-stat .big{display:block;font-size:27px;font-weight:300;letter-spacing:.01em;color:#F2F4FA;line-height:1.15}
.hv-stat .lab{display:block;margin-top:7px;font-size:10.5px;font-weight:650;letter-spacing:.24em;color:#DFE5F2}
.hv-stat .sub{display:block;margin-top:6px;font-size:12.5px;color:#79839E;line-height:1.45}
.hv-stat .pulse{display:block;margin-bottom:11px;color:#E8ECF8}

/* ---------- footer ---------- */
.hv-foot{border-top:1px solid rgba(165,180,220,.13);background:#010206}
.hv-foot-in{
  max-width:1600px;margin:0 auto;padding:30px 46px 36px;
  display:flex;flex-wrap:wrap;gap:18px 34px;align-items:flex-start;justify-content:space-between;
}
.hv-foot .fm{font-size:11px;font-weight:600;letter-spacing:.3em;color:#C9D1E4}
.hv-foot p{font-size:12.5px;color:#79839E;max-width:300px;margin-top:9px;line-height:1.55}
.hv-foot nav{display:flex;gap:26px;font-size:11px;font-weight:600;letter-spacing:.2em;padding-top:3px}
.hv-foot nav a{color:#9AA3BC}
.hv-foot nav a:hover{color:#fff}
.hv-foot .bridge{font-size:12.5px;color:#79839E;padding-top:2px}
.hv-foot .bridge a{color:#DFE5F2;font-weight:600}

/* ---------- responsive ---------- */
@media(max-width:1180px){
  .hv-brain{width:58vw;right:9%}
  .hv-call .dot{left:-70px}
  .hv-call::before{left:-55px;width:calc(var(--lw,86px) - 34px)}
}
@media(max-width:900px){
  .hv-nav{padding:20px 22px 4px}
  .hv-brand{font-size:10px;letter-spacing:.19em}
  .hv-brand::before{width:16px}
  .hv-links{display:none}
  .hv-explore{padding:9px 18px;font-size:10.5px}
  .hv-main{grid-template-columns:1fr;padding:12px 22px 0}
  .hv-copy{padding-top:3.5vh;max-width:none;min-width:0}
  .hv-eyebrow{font-size:9.5px;letter-spacing:.17em}
  .hv-copy h1{font-size:clamp(41px,11.5vw,58px)}
  .hv-sub{font-size:15.5px;max-width:100%}
  .hv-brain{display:none}
  .hv-brain-m{
    display:block;width:calc(100% + 44px);max-width:none;margin:2.5vh 0 0 -22px;
    pointer-events:none;user-select:none;
  }
  .hv-doors{flex-direction:column;align-items:stretch;margin-top:32px}
  .hv-door{justify-content:center;padding:17px 22px}
  .hv-scroll{display:none}
  .hv-calls{align-items:flex-start;gap:24px;padding:4.5vh 0 1vh}
  .hv-call{width:auto;padding-left:22px}
  .hv-call .dot{left:0;top:4px}
  .hv-call::before{display:none}
  .hv-call p{max-width:300px}
  .hv-strip{margin-top:4.5vh}
  .hv-strip-in{grid-template-columns:1fr 1fr;padding:24px 22px 27px;gap:24px 0}
  .hv-stat{padding-right:16px}
  .hv-stat + .hv-stat{border-left:0;padding-left:0}
  .hv-stat:nth-child(even){border-left:1px solid rgba(165,180,220,.16);padding-left:22px}
  .hv-foot-in{padding:26px 22px 32px}
}
@media(min-width:901px) and (max-height:800px){
  .hv-copy{padding-top:3vh}
  .hv-copy h1{font-size:clamp(42px,6.4vh,58px)}
  .hv-sub{margin-top:20px}
  .hv-doors{margin-top:30px}
  .hv-scroll{display:none}
  .hv-brain{top:5%}
  .hv-strip{margin-top:2.5vh}
}
@media(prefers-reduced-motion:reduce){
  .hv-door,.hv-explore,.hv-links a{transition:none}
}