:root{
  --bg:#080F0F;
  --panel:#111518;
  --panel-2:#171D20;
  --panel-3:#0D1315;
  --text:#F8FAFC;
  --muted:#94A3B8;
  --muted-2:#64748B;
  --line:#232A2F;
  --line-strong:#344047;
  --accent:#22E06B;
  --accent-soft:#16C65B;
  --accent-ink:#06110B;
  --danger:#FF4D4D;
  --warn:#F5A623;
  --max:1120px;
  --radius-sm:10px;
  --radius:16px;
  --radius-lg:24px;
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif
}
*{box-sizing:border-box}
html{background:var(--bg);color:var(--text);scroll-behavior:smooth}
body{
  margin:0;
  min-height:100vh;
  line-height:1.55;
  background:
    radial-gradient(circle at 74% 8%,rgba(34,224,107,.06),transparent 28rem),
    linear-gradient(180deg,#091011 0%,#080F0F 44%,#070C0D 100%);
  color:var(--text)
}
body:before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  opacity:.16;
  background-image:
    linear-gradient(rgba(255,255,255,.018) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.018) 1px,transparent 1px);
  background-size:48px 48px;
  mask-image:linear-gradient(to bottom,rgba(0,0,0,.55),transparent 70%)
}
a{color:#B8F8D0;text-decoration:none}
a:hover{text-decoration:none;color:#D8FFE6}
button,input{font:inherit}
.wrap{width:min(var(--max),92vw);margin:auto}
.site-header{
  border-bottom:1px solid rgba(52,64,71,.7);
  background:rgba(8,15,15,.88);
  position:sticky;
  top:0;
  backdrop-filter:blur(18px);
  z-index:20
}
.nav{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:800;color:var(--text);letter-spacing:-.025em}
.brand:hover{color:var(--text)}
.brand-mark{width:30px;height:30px;display:block;flex:0 0 auto}
.brand-name{font-size:1.02rem}
.brand-name span{color:var(--accent)}
.navlinks{display:flex;gap:22px;flex-wrap:wrap;font-size:.91rem}
.navlinks a{color:#CCD5DC;font-weight:600}
.navlinks a:hover{color:var(--text)}
.hero{padding:72px 0 26px;text-align:center}
.eyebrow{
  text-transform:uppercase;
  letter-spacing:.14em;
  font-size:.72rem;
  color:var(--accent);
  font-weight:800
}
.hero h1{
  font-size:clamp(2.7rem,7vw,5.35rem);
  line-height:.94;
  letter-spacing:-.065em;
  margin:10px 0 18px;
  font-weight:820
}
.hero p{max-width:780px;margin:0 auto;color:var(--muted);font-size:1.08rem}.hero .hero-tagline{color:var(--text);font-size:clamp(1.05rem,2.2vw,1.45rem);font-weight:650;letter-spacing:-.02em;margin:-2px auto 12px}
.value-strip{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin:22px auto 0}
.value-strip span{
  display:inline-flex;
  align-items:center;
  gap:7px;
  border:1px solid var(--line);
  background:rgba(17,21,24,.84);
  border-radius:999px;
  padding:8px 12px;
  font-size:.82rem;
  color:#CBD5DC
}
.value-strip img{width:16px;height:16px;color:var(--accent);filter:brightness(0) saturate(100%) invert(77%) sepia(63%) saturate(645%) hue-rotate(85deg) brightness(94%) contrast(91%)}
.test-shell{margin:30px auto 42px;max-width:920px}
.test-box{
  min-height:390px;
  border:1px solid var(--line-strong);
  border-radius:28px;
  background:
    radial-gradient(circle at 50% 48%,rgba(34,224,107,.05),transparent 16rem),
    linear-gradient(180deg,#11181A,#0B1113);
  display:flex;
  align-items:center;
  justify-content:center;
  text-align:center;
  padding:32px;
  user-select:none;
  touch-action:manipulation;
  cursor:pointer;
  position:relative;
  overflow:hidden;
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.02),0 30px 90px rgba(0,0,0,.28);
  transition:none
}
.test-box:before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  opacity:.32;
  background-image:
    linear-gradient(rgba(34,224,107,.055) 1px,transparent 1px),
    linear-gradient(90deg,rgba(34,224,107,.055) 1px,transparent 1px);
  background-size:34px 34px;
  mask-image:radial-gradient(circle at center,#000 0,transparent 74%)
}
.test-box>div{position:relative;z-index:2}
.test-box h2{
  font-size:clamp(1.8rem,4vw,3.1rem);
  letter-spacing:-.035em;
  margin:0 0 10px
}
.test-box p{color:#C6D0D6;margin:0}
.test-box.waiting{
  border-color:#6A3030;
  background:linear-gradient(180deg,#211213,#130C0D)
}
.test-box.waiting:before{background-image:none}
.test-box.ready{
  border-color:#3BFA82;
  background:#0B8C45;
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.12),0 0 60px rgba(34,224,107,.12)
}
.test-box.ready:before{background-image:none}
.test-box.false{
  border-color:#FF6A6A;
  background:#7A2727
}
.test-box.false:before{background-image:none}
.test-box.ready p,.test-box.ready h2,.test-box.false p,.test-box.false h2{color:white}
.test-box.result{
  border-color:#2F6A48;
  background:
    radial-gradient(circle at 50% 48%,rgba(34,224,107,.11),transparent 16rem),
    linear-gradient(180deg,#101A16,#0B1113)
}
.test-box.result h2{
  font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;
  font-variant-numeric:tabular-nums;
  font-size:clamp(3.8rem,10vw,7.4rem);
  letter-spacing:-.08em;
  line-height:.9
}
.test-box.result p{font-size:1rem}
.controls{display:flex;gap:10px;justify-content:center;margin-top:16px;flex-wrap:wrap}
.btn{
  min-height:46px;
  border:1px solid transparent;
  border-radius:12px;
  padding:12px 18px;
  font-weight:780;
  cursor:pointer;
  background:var(--accent);
  color:var(--accent-ink);
  box-shadow:0 8px 24px rgba(34,224,107,.12);
  transition:transform .16s ease,background-color .16s ease,border-color .16s ease,color .16s ease
}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px}.btn-icon{width:17px;height:17px;filter:brightness(0) invert(1)}.btn:hover{transform:translateY(-1px);background:#35EB7A}
.btn:active{transform:translateY(0)}
.btn.secondary{
  background:var(--panel-2);
  color:var(--text);
  border-color:var(--line);
  box-shadow:none
}
.btn.secondary:hover{background:#20282C;border-color:#3A464D}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none}
.stats{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;margin:22px 0}
.card{
  background:linear-gradient(180deg,rgba(23,29,32,.96),rgba(17,21,24,.96));
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:18px;
  box-shadow:0 16px 42px rgba(0,0,0,.12)
}
.stat-label{
  color:var(--muted);
  font-size:.76rem;
  text-transform:uppercase;
  letter-spacing:.06em;
  font-weight:750
}
.stat-value{
  font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;
  font-variant-numeric:tabular-nums;
  font-size:1.55rem;
  font-weight:800;
  margin-top:5px
}
.section{padding:42px 0}
.section h2{
  font-size:clamp(1.55rem,3vw,2.35rem);
  letter-spacing:-.035em;
  margin:0 0 16px
}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.muted{color:var(--muted)}
.trial-row{display:flex;gap:8px;flex-wrap:wrap}
.pill{
  padding:8px 10px;
  border:1px solid var(--line);
  background:var(--panel);
  border-radius:999px;
  font-size:.86rem;
  font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;
  font-variant-numeric:tabular-nums
}
.history{width:100%;border-collapse:collapse}
.history th,.history td{padding:11px 10px;border-bottom:1px solid var(--line);text-align:left;font-size:.9rem}
.history th{color:var(--muted);font-size:.75rem;text-transform:uppercase;letter-spacing:.06em}
.callout{
  border:1px solid var(--line);
  border-left:3px solid var(--accent);
  padding:15px 16px;
  background:var(--panel);
  border-radius:12px
}
.warn{border-left-color:var(--warn)}
.footer{border-top:1px solid var(--line);padding:36px 0 52px;color:var(--muted);font-size:.9rem}
.footer-links{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:8px}
.page{padding:62px 0}
.page h1{font-size:clamp(2.2rem,5vw,4.1rem);letter-spacing:-.05em;line-height:1.02}
.page h2{margin-top:42px}
.content{max-width:820px}
.consent{display:flex;gap:10px;align-items:flex-start}
.small{font-size:.86rem}
.hidden{display:none!important}
.faq details{
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:14px;
  padding:15px 16px;
  margin:10px 0
}
.faq summary{font-weight:760;cursor:pointer}
.faq details p{margin-bottom:0}
.consent-banner{
  position:fixed;
  left:16px;
  right:16px;
  bottom:16px;
  z-index:100;
  background:#111518;
  border:1px solid #2D383E;
  border-radius:16px;
  padding:16px;
  box-shadow:0 20px 60px rgba(0,0,0,.42)
}
.consent-banner .inner{width:min(900px,100%);margin:auto;display:flex;align-items:center;justify-content:space-between;gap:16px}
.consent-banner p{margin:0;color:#C7D0D6}
.consent-actions{display:flex;gap:8px;flex-shrink:0}
.reflex-ready{background:linear-gradient(180deg,#11191B,#0B1113)}
.reflex-target,.reflex-distractor{
  position:absolute;
  width:68px;
  height:68px;
  border-radius:50%;
  transform:translate(-50%,-50%);
  border:2px solid rgba(255,255,255,.24);
  z-index:5;
  cursor:pointer
}
.reflex-target{
  background:var(--accent);
  color:#07120C;
  box-shadow:0 0 0 10px rgba(34,224,107,.11),0 16px 32px rgba(0,0,0,.28)
}
.reflex-distractor{background:#536068}
.reflex-target{font-size:28px;font-weight:900;line-height:1}
.history-summary{margin:0 0 12px;font-weight:700}
.history-trend{margin:6px 0 18px;color:var(--accent);height:96px}
.trend-svg{width:100%;height:96px;display:block}
.benchmark-rank,.result-rank{font-size:1.03rem;font-weight:800}
.benchmark-chart{height:180px;display:flex;align-items:flex-end;gap:5px;overflow-x:auto;padding:18px 0 2px}
.benchmark-bin{height:100%;min-width:34px;display:flex;flex-direction:column;justify-content:flex-end;align-items:center;gap:5px}
.benchmark-bar{width:100%;min-height:4px;background:var(--accent);border-radius:4px 4px 0 0;opacity:.8}
.benchmark-bin span{font-size:.7rem;color:var(--muted)}
.challenge-banner{
  margin-top:8px;
  padding:14px 18px;
  border:1px solid #2F6A48;
  background:rgba(34,224,107,.07);
  border-radius:14px;
  text-align:center
}
.result-insight{
  margin-top:16px;
  padding:13px 14px;
  border-radius:12px;
  background:var(--panel-2);
  border:1px solid var(--line);
  font-weight:650
}
.result-insight.challenge-win{border-color:var(--accent);background:rgba(34,224,107,.07)}
.result-insight.challenge-lose{border-color:var(--warn);background:rgba(245,166,35,.07)}
.result-rank{margin:14px 0 0}
.result-rank a{font-weight:700}
.history-actions{margin-top:14px;display:flex;justify-content:flex-end}
.history-card{overflow-x:auto}
.history-card .history-actions,.history-card .history-summary,.history-card .history-trend{min-width:min(100%,520px)}
.history-card .history{min-width:520px}
@media(max-width:760px){
  .site-header{position:static}
  .nav{min-height:auto;padding:12px 0;flex-direction:column;align-items:flex-start;gap:10px}
  .navlinks{display:flex;width:100%;gap:14px;flex-wrap:nowrap;overflow-x:auto;white-space:nowrap;padding:2px 0 6px;scrollbar-width:thin}
  .navlinks a{flex:0 0 auto}
  .hero{padding-top:46px;text-align:left}
  .hero p{margin-left:0}
  .value-strip{justify-content:flex-start}
  .test-shell{margin-top:20px}
  .test-box{min-height:330px;border-radius:22px;padding:22px}
  .stats{grid-template-columns:repeat(2,1fr)}
  .stats .card:last-child{grid-column:1/-1}
  .grid2{grid-template-columns:1fr}
  .controls .btn{flex:1 1 160px}
  .challenge-banner{text-align:left}
  .history-actions{justify-content:stretch}
  .history-actions .btn{width:100%}
  .reflex-target,.reflex-distractor{width:60px;height:60px}
  .consent-banner .inner{align-items:flex-start;flex-direction:column}
  .consent-actions{width:100%}
  .consent-actions .btn{flex:1}
  body{padding-bottom:env(safe-area-inset-bottom)}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*:before,*:after{animation:none!important;transition:none!important}
}


/* First-screen instrument: the core task is the hero. */
.first-screen{
  min-height:calc(100svh - 69px);
  display:flex;
  align-items:center;
  padding:28px 0 34px;
  position:relative
}
.first-screen-grid{
  display:grid;
  grid-template-columns:minmax(280px,.78fr) minmax(560px,1.42fr);
  gap:clamp(28px,5vw,74px);
  align-items:center
}
.hero-compact{
  padding:0;
  text-align:left
}
.hero-compact h1{
  font-size:clamp(3.15rem,5.8vw,5.55rem);
  line-height:.92;
  letter-spacing:-.065em;
  margin:12px 0 18px;
  max-width:8.2ch
}
.hero-compact p{margin-left:0;margin-right:0;max-width:560px}
.hero-compact .hero-tagline{
  margin:0 0 12px;
  font-size:clamp(1.18rem,2vw,1.55rem);
  color:var(--text)
}
.hero-copy{color:var(--muted);font-size:1rem!important;max-width:500px!important}
.hero-compact .value-strip{justify-content:flex-start;margin:22px 0 0}
.hero-proof{
  display:flex;
  align-items:flex-start;
  gap:9px;
  color:var(--muted-2);
  font-size:.79rem;
  margin-top:18px;
  max-width:430px
}
.proof-dot{
  width:7px;height:7px;flex:0 0 auto;border-radius:50%;
  background:var(--accent);margin-top:.42em;
  box-shadow:0 0 0 4px rgba(34,224,107,.08)
}
.instrument-panel{
  min-width:0;
  border:1px solid var(--line);
  border-radius:26px;
  padding:15px;
  background:linear-gradient(180deg,rgba(18,24,26,.98),rgba(10,15,16,.98));
  box-shadow:0 34px 110px rgba(0,0,0,.34),inset 0 1px rgba(255,255,255,.025)
}
.instrument-topline{
  min-height:42px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:0 6px 11px;
  border-bottom:1px solid rgba(52,64,71,.6)
}
.instrument-topline>div{display:flex;align-items:center;gap:10px;min-width:0}
.instrument-kicker{
  color:var(--accent);
  font-size:.66rem;
  letter-spacing:.14em;
  font-weight:850
}
.instrument-mode{color:var(--muted);font-size:.78rem}
.trial-status{
  color:#D7E0E5;
  font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;
  font-variant-numeric:tabular-nums;
  font-size:.76rem;
  white-space:nowrap
}
.instrument-test{
  margin-top:14px;
  min-height:390px;
  border-radius:20px;
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.02)
}
.instrument-reticle{
  width:58px;height:58px;margin:0 auto 18px;position:relative;opacity:.9
}
.instrument-reticle:before,.instrument-reticle:after{
  content:"";position:absolute;top:50%;width:7px;border-radius:4px;transform:translateY(-50%)
}
.instrument-reticle:before{height:28px;left:5px;background:#7E8991}
.instrument-reticle:after{height:43px;left:20px;background:#E9EEF1}
.instrument-reticle span{
  position:absolute;width:18px;height:18px;border-radius:50%;background:var(--accent);
  left:38px;top:20px;box-shadow:0 0 0 7px rgba(34,224,107,.08)
}
.instrument-reticle i{
  position:absolute;width:84px;height:1px;background:linear-gradient(90deg,transparent,rgba(34,224,107,.28),transparent);
  left:-12px;top:29px
}
.test-shortcut{margin-top:8px!important;font-size:.78rem!important;color:var(--muted-2)!important}
.test-box.waiting .instrument-reticle,.test-box.ready .instrument-reticle,.test-box.false .instrument-reticle,.test-box.result .instrument-reticle{display:none}
.instrument-readout{
  display:grid;grid-template-columns:1fr auto;gap:16px;
  padding:12px 6px 0;color:#D4DCE1;font-size:.76rem
}
.environment-readout,.timing-readout{display:flex;gap:8px;align-items:center;min-width:0}
.environment-readout #env{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.readout-label{
  color:var(--muted-2);text-transform:uppercase;letter-spacing:.08em;font-size:.64rem;font-weight:800
}
.instrument-controls{justify-content:flex-start;margin:13px 0 0;padding:0 6px 1px}
.instrument-controls .btn:first-child{min-width:138px}
.first-screen-results{padding:0 6px 2px}
.stats-instrument{
  grid-template-columns:1fr 1.15fr 1fr 1fr 1fr;
  gap:8px;margin:13px 0 9px
}
.stats-instrument .card{padding:11px 12px;border-radius:11px;box-shadow:none}
.stats-instrument .stat-value{font-size:1.18rem}
.stats-instrument .stat-primary{border-color:rgba(34,224,107,.45);background:#0D2116}
.stats-instrument .stat-primary .stat-value{color:var(--accent)}
.result-detail-row{
  display:flex;align-items:flex-start;justify-content:space-between;gap:12px;
  padding-top:2px
}
.result-detail-row .trial-row{flex:0 1 auto}
.result-detail-row .pill{padding:5px 7px;font-size:.72rem}
.result-detail-row .result-rank{margin:4px 0 0;text-align:right;font-size:.77rem;max-width:330px}
.first-screen-results .result-insight{margin-top:9px;padding:9px 11px;font-size:.79rem}
.instrument-panel:has(.test-box.result) .instrument-test{min-height:250px}
.instrument-panel:has(.test-box.result) .test-box.result h2{font-size:clamp(3.4rem,7vw,5.6rem)}

@media(max-width:980px){
  .first-screen{min-height:auto;padding:26px 0 34px}
  .first-screen-grid{grid-template-columns:1fr;gap:24px}
  .hero-compact{max-width:760px}
  .hero-compact h1{max-width:none;font-size:clamp(3rem,9vw,5rem)}
  .hero-copy{max-width:680px!important}
  .instrument-panel{max-width:820px;width:100%;margin:auto}
}

@media(max-width:760px){
  .first-screen{padding:16px 0 26px}
  .first-screen-grid{gap:16px}
  .hero-compact .eyebrow{font-size:.64rem}
  .hero-compact h1{font-size:clamp(2.55rem,13vw,3.8rem);margin:7px 0 10px;max-width:9ch}
  .hero-compact .hero-tagline{font-size:1rem;margin-bottom:8px}
  .hero-copy{font-size:.88rem!important;line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
  .hero-compact .value-strip{margin-top:12px;gap:6px;flex-wrap:nowrap;overflow-x:auto;padding-bottom:2px}
  .hero-compact .value-strip span{font-size:.72rem;padding:6px 8px;white-space:nowrap}
  .hero-proof{display:none}
  .instrument-panel{padding:10px;border-radius:19px}
  .instrument-topline{padding:0 3px 8px;min-height:34px}
  .instrument-mode{display:none}
  .trial-status{font-size:.68rem}
  .instrument-test{min-height:clamp(290px,43vh,390px);margin-top:10px;border-radius:15px;padding:20px}
  .instrument-test h2{font-size:clamp(1.8rem,8vw,2.6rem)}
  .instrument-reticle{margin-bottom:12px}
  .instrument-readout{grid-template-columns:1fr;padding:9px 3px 0;gap:3px}
  .timing-readout{display:none}
  .environment-readout{font-size:.68rem}
  .instrument-controls{padding:0 3px;margin-top:10px}
  .instrument-controls .btn{flex:1 1 120px;min-height:44px;padding:10px 11px;font-size:.82rem}
  .stats-instrument{grid-template-columns:repeat(3,1fr);gap:6px;margin-top:10px}
  .stats-instrument .stat-secondary{display:none}
  .stats-instrument .card{padding:9px 8px}
  .stats-instrument .stat-label{font-size:.63rem}
  .stats-instrument .stat-value{font-size:1.03rem}
  .result-detail-row{display:block}
  .result-detail-row .trial-row{display:none}
  .result-detail-row .result-rank{text-align:left;max-width:none;font-size:.72rem;margin-top:7px}
  .instrument-panel:has(.test-box.result) .instrument-test{min-height:215px}
  .instrument-panel:has(.test-box.result) .test-box.result h2{font-size:clamp(3.2rem,17vw,4.7rem)}
}

@media(max-height:760px) and (min-width:981px){
  .first-screen{padding:18px 0 20px}
  .hero-compact h1{font-size:clamp(3rem,5.4vw,4.75rem)}
  .instrument-test{min-height:330px}
  .hero-proof{margin-top:12px}
}

.instrument-panel.is-testing .instrument-controls{display:none}
.instrument-panel.is-testing .instrument-readout{opacity:.72}
.test-box.waiting .test-shortcut,
.test-box.ready .test-shortcut,
.test-box.false .test-shortcut,
.test-box.result .test-shortcut{display:none}

/* Visual acceptance polish against the selected Precision Lab board. */
.nav{position:relative}
.menu-toggle{
  display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:11px;
  background:var(--panel);padding:10px;cursor:pointer
}
.menu-toggle span{display:block;height:2px;background:#DDE4E8;border-radius:2px;margin:4px 0}
.feature-strip{
  display:grid!important;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px!important;
  overflow:visible!important
}
.feature-point{
  min-width:0;display:flex;align-items:flex-start;gap:9px;padding:0;
  color:#DCE4E8
}
.feature-icon{
  width:34px;height:34px;flex:0 0 34px;border-radius:50%!important;
  border:1px solid #29463A!important;background:#0B1711!important;
  display:grid!important;place-items:center;padding:0!important;gap:0!important
}
.feature-icon img{width:17px!important;height:17px!important}
.feature-point strong{display:block;font-size:.78rem;line-height:1.25}
.feature-point small{display:block;margin-top:3px;color:var(--muted);font-size:.67rem;line-height:1.25}
.test-start{
  width:min(310px,86%);margin:20px auto 0;min-height:50px;
  text-transform:uppercase;letter-spacing:.03em
}
.instrument-panel.is-testing .test-start{display:none}
.test-box.result .test-start{
  width:auto;min-width:150px;margin-top:18px;text-transform:none
}
.instrument-controls:not(:has(.btn:not(.hidden))){display:none}
@media(min-width:981px){
  .first-screen-grid{
    grid-template-columns:minmax(390px,1.04fr) minmax(500px,.96fr);
    gap:clamp(34px,4vw,54px)
  }
  .instrument-test{min-height:360px}
}
@media(max-width:760px){
  .site-header{position:sticky;top:0}
  .nav{min-height:58px;padding:0;flex-direction:row;align-items:center;gap:12px}
  .brand-mark{width:28px;height:28px}
  .menu-toggle{display:block;margin-left:auto}
  .navlinks{
    display:none;position:absolute;top:calc(100% + 1px);left:0;right:0;width:100%;
    padding:10px;gap:2px;overflow:visible;white-space:normal;
    flex-direction:column;background:rgba(8,15,15,.98);border:1px solid var(--line);
    border-radius:0 0 14px 14px;box-shadow:0 18px 46px rgba(0,0,0,.38)
  }
  .navlinks.open{display:flex}
  .navlinks a{padding:10px 9px;border-radius:8px}
  .navlinks a:hover{background:var(--panel)}
  .feature-strip{grid-template-columns:repeat(3,minmax(0,1fr));margin-top:13px!important}
  .feature-point{display:block;text-align:center}
  .feature-icon{margin:0 auto 6px}
  .feature-point strong{font-size:.7rem}
  .feature-point small{display:none}
  .test-start{width:min(300px,92%);min-height:48px;margin-top:16px}
}


/* Immersive reaction-test flow: split-screen idle/result, full-viewport active testing. */
.first-screen{align-items:flex-start}
.first-screen-grid{align-items:start}
.hero-compact{align-self:start;padding-top:clamp(24px,5vh,58px)}
.instrument-panel{align-self:start}
.instrument-session{display:flex;align-items:center;gap:12px}
.exit-test{
  display:none;
  min-height:34px;
  padding:6px 10px;
  border:1px solid var(--line);
  border-radius:9px;
  background:transparent;
  color:var(--muted);
  font-weight:700;
  cursor:pointer
}
.exit-test:hover{color:var(--text);border-color:var(--line-strong)}
body.test-immersive{overflow:hidden}
body.test-immersive .instrument-panel.is-immersive{
  position:fixed;
  inset:0;
  z-index:1000;
  width:100vw;
  height:100dvh;
  max-width:none;
  border:0;
  border-radius:0;
  padding:clamp(12px,2vw,28px);
  background:
    radial-gradient(circle at 50% 48%,rgba(34,224,107,.045),transparent 36rem),
    #080F0F;
  box-shadow:none;
  display:flex;
  flex-direction:column
}
body.test-immersive .instrument-panel.is-immersive .instrument-topline,
body.test-immersive .instrument-panel.is-immersive .instrument-readout,
body.test-immersive .instrument-panel.is-immersive .instrument-challenge{
  width:min(1380px,96vw);
  margin-left:auto;
  margin-right:auto
}
body.test-immersive .instrument-panel.is-immersive .instrument-topline{
  min-height:48px;
  flex:0 0 auto
}
body.test-immersive .instrument-panel.is-immersive .exit-test{display:inline-flex;align-items:center;justify-content:center}
body.test-immersive .instrument-panel.is-immersive .instrument-test{
  flex:1 1 auto;
  min-height:0;
  width:min(1380px,96vw);
  margin:clamp(12px,2vh,22px) auto 0;
  border-radius:22px
}
body.test-immersive .instrument-panel.is-immersive .instrument-test h2{
  font-size:clamp(2.8rem,6vw,5.7rem)
}
body.test-immersive .instrument-panel.is-immersive .instrument-test p{
  font-size:clamp(1rem,1.5vw,1.25rem)
}
body.test-immersive .instrument-panel.is-immersive .instrument-readout{
  flex:0 0 auto;
  padding-top:12px;
  padding-bottom:max(2px,env(safe-area-inset-bottom))
}
body.test-immersive .instrument-panel.is-immersive .instrument-controls,
body.test-immersive .instrument-panel.is-immersive .first-screen-results{display:none!important}

@media(max-width:760px){
  .hero-compact{padding-top:2px}
  body.test-immersive .instrument-panel.is-immersive{padding:10px}
  body.test-immersive .instrument-panel.is-immersive .instrument-topline,
  body.test-immersive .instrument-panel.is-immersive .instrument-readout,
  body.test-immersive .instrument-panel.is-immersive .instrument-challenge,
  body.test-immersive .instrument-panel.is-immersive .instrument-test{width:100%}
  body.test-immersive .instrument-panel.is-immersive .instrument-test{
    margin-top:8px;
    border-radius:16px
  }
  body.test-immersive .instrument-panel.is-immersive .instrument-test h2{
    font-size:clamp(2.45rem,13vw,4rem)
  }
  body.test-immersive .instrument-panel.is-immersive .instrument-readout{
    font-size:.7rem
  }
}


/* Reliable cross-browser challenge sharing */
body.share-open{overflow:hidden}
.share-sheet{position:fixed;inset:0;z-index:1400;display:grid;place-items:center;padding:20px}
.share-sheet.hidden{display:none}
.share-sheet-backdrop{position:absolute;inset:0;background:rgba(0,0,0,.72);backdrop-filter:blur(6px)}
.share-sheet-panel{
  position:relative;z-index:1;width:min(620px,100%);max-height:min(820px,92dvh);overflow:auto;
  border:1px solid var(--line);border-radius:22px;background:#0D1214;padding:24px;
  box-shadow:0 36px 120px rgba(0,0,0,.55)
}
.share-sheet-close{
  position:absolute;right:14px;top:14px;width:38px;height:38px;border-radius:10px;
  border:1px solid var(--line);background:var(--panel);color:var(--text);font-size:1.45rem;cursor:pointer
}
.share-sheet-kicker{color:var(--accent);font-size:.7rem;letter-spacing:.14em;font-weight:850;margin-bottom:7px}
.share-sheet-panel h2{margin:0 48px 16px 0;font-size:clamp(1.7rem,4vw,2.25rem)}
.share-sheet-preview{
  border:1px solid var(--line);border-radius:18px;padding:20px;
  background:linear-gradient(145deg,#111719,#09100F);margin-bottom:18px
}
.share-preview-brand{display:flex;align-items:center;gap:9px;font-weight:800}
.share-preview-label{margin-top:24px;font-size:.76rem;letter-spacing:.12em;color:var(--muted);font-weight:800}
.share-preview-score{font:800 clamp(3.2rem,10vw,5.4rem)/1 ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;letter-spacing:-.06em;margin:8px 0;color:var(--text)}
.share-preview-meta{color:var(--muted);font-size:.92rem}
.share-preview-cta{margin-top:22px;color:var(--accent);font-weight:850;letter-spacing:.08em}
.share-url-label{display:block;color:var(--muted);font-size:.75rem;text-transform:uppercase;letter-spacing:.08em;font-weight:800;margin-bottom:7px}
.share-url-row{display:grid;grid-template-columns:1fr auto;gap:8px}
.share-url{
  min-width:0;width:100%;border:1px solid var(--line);border-radius:10px;background:#080D0E;color:var(--text);
  padding:11px 12px;font:500 .8rem ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace
}
.share-sheet-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.share-status{min-height:1.3em;margin:12px 0 0}
@media(max-width:600px){
  .share-sheet{padding:10px;align-items:end}
  .share-sheet-panel{border-radius:20px 20px 12px 12px;padding:19px 16px max(18px,env(safe-area-inset-bottom))}
  .share-url-row{grid-template-columns:1fr}
  .share-url-row .btn,.share-sheet-actions .btn{width:100%}
}


/* Main keyword page depth: answer the user's score, then explain fair comparison. */
.section-heading{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:18px}
.section-heading h2{margin:4px 0 0}
.text-link{font-weight:750;white-space:nowrap}
.section-lede{max-width:820px;color:var(--muted);margin:-4px 0 22px}
.score-explain-grid{display:grid;grid-template-columns:minmax(260px,.8fr) minmax(340px,1.2fr);gap:12px}
.score-explain-main,.score-explain-context{
  border:1px solid var(--line);border-radius:18px;background:var(--panel);padding:22px
}
.score-explain-main{background:linear-gradient(145deg,#0D2116,#101719)}
.score-explain-value{font:800 clamp(3.8rem,8vw,6.4rem)/.92 ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;letter-spacing:-.07em;color:var(--accent)}
.score-explain-value small{font-size:.22em;letter-spacing:0;color:var(--muted);margin-left:8px}
.score-explain-summary{color:#D7E0E4;font-weight:700}
.score-trials{display:flex;gap:7px;flex-wrap:wrap;margin-top:16px}
.score-trials span{
  min-width:72px;border:1px solid #2A373D;border-radius:10px;background:#0A1012;padding:8px 9px;
  display:grid;grid-template-columns:auto 1fr auto;gap:5px;align-items:baseline
}
.score-trials b{font-size:.66rem;color:var(--muted-2)}.score-trials em{font-style:normal;font-weight:800}.score-trials small{font-size:.65rem;color:var(--muted)}
.score-context-label{font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);font-weight:850}
.score-explain-context>p:first-of-type{font-size:1.05rem;font-weight:750;color:#E7EDF0}
.compare-flow{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:12px;align-items:stretch}
.compare-step{border:1px solid var(--line);border-radius:16px;background:var(--panel);padding:18px;display:flex;flex-direction:column}
.compare-step.primary{border-color:#2F7A4D;background:#0C1D13}
.compare-step strong{font-size:1rem;margin:9px 0 5px}.compare-step small{color:var(--muted);line-height:1.45}
.compare-num{color:var(--accent);font:800 .68rem ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.1em}
.compare-arrow{display:grid;place-items:center;color:#55636A;font-size:1.2rem}
.comparison-note{margin-top:12px;padding:12px 14px;border-left:2px solid var(--accent);background:#0B1210;color:var(--muted);font-size:.85rem}
.five-trial-explainer{display:grid;grid-template-columns:minmax(420px,1.15fr) minmax(280px,.85fr);gap:20px;align-items:center}
.five-trial-sequence{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}
.five-trial-sequence span{border:1px solid var(--line);background:var(--panel);border-radius:14px;padding:16px 10px;text-align:center}
.five-trial-sequence b{display:block;color:var(--muted-2);font-size:.7rem}.five-trial-sequence em{display:inline-block;font:800 1.35rem ui-monospace,SFMono-Regular,Menlo,monospace;font-style:normal;margin-top:6px}.five-trial-sequence small{font-size:.65rem;color:var(--muted);margin-left:3px}
.five-trial-sequence .median-example{border-color:#2F7A4D;background:#0C1D13;color:var(--accent)}
.five-trial-copy{border-left:1px solid var(--line);padding-left:20px}.five-trial-copy strong{font-size:1.12rem}.five-trial-copy p{color:var(--muted)}

/* Average Reaction Time guide: research-first data presentation. */
.guide-content{max-width:1040px}
.guide-hero{max-width:850px;margin-bottom:28px}.guide-dek{font-size:clamp(1.08rem,2vw,1.3rem);color:#CFD7DC;line-height:1.65}
.guide-content section{margin:44px 0}
.guide-stat-band{display:grid;grid-template-columns:repeat(3,1fr);gap:10px!important;margin-top:26px!important}
.guide-stat{border:1px solid var(--line);border-radius:17px;background:var(--panel);padding:20px}
.guide-stat>span{font:800 clamp(2.8rem,6vw,4.4rem)/1 ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:-.06em;color:var(--accent)}
.guide-stat>small{color:var(--muted);font-weight:750;margin-left:4px}.guide-stat>strong{display:block;margin-top:12px}.guide-stat>p{color:var(--muted);font-size:.82rem;margin-bottom:0}
.score-band-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;margin:18px 0}
.score-band{border:1px solid var(--line);border-radius:15px;background:var(--panel);padding:17px}.score-band>span{font:800 1.45rem ui-monospace,SFMono-Regular,Menlo,monospace}.score-band>strong{display:block;margin:8px 0 5px}.score-band>p{color:var(--muted);font-size:.82rem;margin:0}.score-band.accent{border-color:#2F7A4D;background:#0C1D13}.score-band.accent>span{color:var(--accent)}.score-band.caution{border-color:#6C5328}
.source-note{font-size:.8rem;color:var(--muted)}
.guide-split{display:grid;grid-template-columns:1.2fr .8fr;gap:20px;align-items:start}.guide-callout{border:1px solid #2F7A4D;border-radius:17px;background:#0C1D13;padding:20px}.guide-callout>strong{display:block;font-size:1.2rem;margin:7px 0}.guide-callout p{color:#B9C8BF;margin-bottom:0}
.guide-benchmark{border:1px solid var(--line);border-radius:20px;background:linear-gradient(145deg,#111719,#0A1011);padding:24px}.guide-benchmark h2{margin-top:5px}.guide-benchmark-flow{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:18px}.guide-benchmark-flow span{border:1px solid #2A373D;border-radius:999px;padding:8px 11px;font-weight:750}.guide-benchmark-flow i{font-style:normal;color:var(--muted)}
.guide-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:24px}

@media(max-width:760px){
  .section-heading{align-items:flex-start;display:block}.section-heading .text-link{display:inline-block;margin-top:8px}
  .score-explain-grid,.five-trial-explainer,.guide-split{grid-template-columns:1fr}
  .compare-flow{grid-template-columns:1fr}.compare-arrow{transform:rotate(90deg);height:18px}
  .five-trial-sequence{grid-template-columns:repeat(5,minmax(70px,1fr));overflow-x:auto;padding-bottom:4px}
  .five-trial-copy{border-left:0;border-top:1px solid var(--line);padding:14px 0 0}
  .guide-stat-band{grid-template-columns:1fr}.score-band-grid{grid-template-columns:repeat(2,1fr)}
}