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.anatomy{min-height:1000px;background:#0b2439;display:grid;grid-template-columns:minmax(360px,.75fr) minmax(550px,1.25fr);padding:140px clamp(30px,7vw,110px);gap:8vw;position:relative;overflow:hidden}.anatomy:before{content:"";position:absolute;inset:0;background:repeating-radial-gradient(circle at 75% 50%,transparent 0 65px,rgba(160,197,211,.06) 66px 67px)}.anatomy-intro{position:relative;z-index:2;align-self:center}.anatomy h2{margin:22px 0 32px}.anatomy-intro>p:last-of-type{max-width:540px;color:rgba(233,221,189,.74)}.layer-controls{margin-top:45px;border-top:1px solid rgba(233,221,189,.2)}.layer-button{width:100%;min-height:56px;background:none;border:0;border-bottom:1px solid rgba(233,221,189,.15);color:rgba(233,221,189,.65);display:flex;align-items:center;text-align:left;padding:10px 4px;cursor:pointer;font:500 11px var(--mono);letter-spacing:.08em;text-transform:uppercase;transition:padding .2s,color .2s,background .2s}.layer-button span{color:var(--copper);margin-right:20px}.layer-button:after{content:"+";margin-left:auto}.layer-button:hover,.layer-button.active{padding-left:15px;color:var(--cream);background:rgba(197,119,69,.1)}.layer-button.active:after{content:"—"}
.cable-specimen{position:relative;z-index:1;align-self:center;min-height:740px}.specimen-ring{position:absolute;inset:0;border:1px solid rgba(233,221,189,.2);border-radius:50%}.specimen-ring:before,.specimen-ring:after{content:"";position:absolute;left:50%;width:7px;height:7px;border-radius:50%;background:var(--red);box-shadow:0 0 0 6px rgba(212,71,63,.08)}.specimen-ring:before{top:-4px}.specimen-ring:after{bottom:-4px}.specimen-ring span{position:absolute;top:-12px;left:18%;padding:0 15px;background:#0b2439;font:500 7px var(--mono);letter-spacing:.14em;color:var(--copper-light)}.cable-cutaway{width:min(650px,88%);margin:auto}.layer-armour>circle{fill:#152d3f;stroke:#9b6849;stroke-width:3}.armour-wires circle{fill:#684f42;stroke:#d09462;stroke-width:2}.layer-jute{fill:#2b382f;stroke:#a3875a;stroke-width:3}.layer-jute+*{}#jutePattern path{stroke:#c2a976;stroke-width:2}.layer-gutta{fill:#e2d4ae;stroke:#5f4f37;stroke-width:3}.gutta-mid{fill:#cdbb91}.gutta-inner{fill:#eadfbe}.layer-core>circle:first-child{fill:#a85c34;stroke:#efb170;stroke-width:3}.layer-core circle:not(:first-child){fill:#d98b53;stroke:#5d2d1e;stroke-width:1}.measure-lines path{stroke:rgba(233,221,189,.4);stroke-dasharray:3 5}.measure-lines text{font:500 9px var(--mono);fill:rgba(233,221,189,.62)}.cable-layer{transition:opacity .4s,filter .4s,transform .4s;transform-origin:325px 325px}.cable-specimen[data-active-layer] .cable-layer{opacity:.22}.cable-specimen[data-active-layer="core"] .layer-core,.cable-specimen[data-active-layer="gutta"] .layer-gutta,.cable-specimen[data-active-layer="jute"] .layer-jute,.cable-specimen[data-active-layer="armour"] .layer-armour{opacity:1;filter:drop-shadow(0 0 16px rgba(225,165,109,.4));transform:scale(1.02)}.specimen-caption{position:absolute;right:-20px;bottom:5px;width:330px;background:var(--paper);color:var(--ink);padding:20px 24px;box-shadow:10px 10px 0 rgba(0,0,0,.2)}.specimen-caption span{font:600 8px var(--mono);letter-spacing:.12em;color:var(--red)}.specimen-caption strong{display:block;font-size:20px;margin:8px 0}.specimen-caption p{font-size:13px;margin:0;line-height:1.5}

.ledger{background:var(--paper);color:var(--ink);padding:150px clamp(30px,7vw,110px);display:grid;grid-template-columns:minmax(270px,.48fr) 1fr;gap:7vw}.ledger-heading{position:relative}.ledger-heading:after{content:"";position:absolute;width:90px;height:90px;border:1px solid var(--red);border-radius:50%;right:0;bottom:-50px;box-shadow:inset 0 0 0 5px var(--paper),inset 0 0 0 6px var(--red)}.ledger h2{margin:28px 0}.ledger-heading>p{font-size:20px;max-width:300px;color:#385065}.latency-table{border-top:2px solid var(--ink)}.table-row{display:grid;grid-template-columns:1.1fr 1.1fr 1.2fr .8fr;align-items:center;min-height:128px;border-bottom:1px solid rgba(14,42,66,.3);gap:20px}.table-row>span{font-size:15px}.table-row b{display:block;font:400 52px/.9 var(--display);letter-spacing:.03em}.table-row small{display:block;font:500 8px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:#5e6f79;margin-top:7px}.table-row strong{font:500 24px var(--mono)}.table-row i{display:block;height:6px;width:var(--bar);background:var(--copper);position:relative}.table-row i:after{content:"";position:absolute;right:0;top:-5px;width:2px;height:16px;background:var(--red)}.table-head{min-height:52px}.table-head>span{font:600 8px var(--mono);letter-spacing:.12em;text-transform:uppercase}.table-row.feature{background:var(--ink);color:var(--cream);margin:0 -22px;padding:0 22px;box-shadow:0 10px 25px rgba(14,42,66,.17)}.table-row.feature small{color:rgba(233,221,189,.58)}.ledger-note{grid-column:2;display:flex;gap:20px;width:min(500px,100%);margin-left:auto;margin-top:15px}.ledger-note span{font:400 45px var(--display);color:var(--red)}.ledger-note p{font-size:13px;margin:8px 0}

.now{position:relative;min-height:920px;background:#071a2b;overflow:hidden;padding:140px clamp(30px,7vw,110px) 50px;display:grid;grid-template-columns:1fr 1fr;grid-template-rows:1fr auto;align-items:center}.now-map{position:absolute;inset:30px 0 0 30%;opacity:.8}.now-map svg{width:100%;height:100%}.now-map rect{fill:none;stroke:rgba(162,198,210,.08);stroke-width:.7}.coast{fill:none;stroke:rgba(233,221,189,.4);stroke-width:2}.modern-routes path{fill:none;stroke:var(--red);stroke-width:1.6;stroke-dasharray:6 6;animation:routeFlow 14s linear infinite}.modern-routes path:nth-child(2){animation-delay:-3s}.modern-routes path:nth-child(3){animation-delay:-6s}.modern-routes path:nth-child(4){animation-delay:-9s}.route-dots circle{fill:var(--copper-light)}.now-copy{position:relative;z-index:2;align-self:center}.now h2{font-size:clamp(76px,9vw,150px);color:var(--cream);margin:25px 0 35px}.now-copy>p{max-width:510px;color:rgba(233,221,189,.76);font-size:20px}.modern-stats{position:relative;z-index:2;align-self:end;justify-self:end;width:min(480px,100%);background:rgba(7,26,43,.82);backdrop-filter:blur(8px);border:1px solid rgba(233,221,189,.2)}.modern-stats>div{display:grid;grid-template-columns:130px 1fr;gap:18px;padding:19px 24px;border-bottom:1px solid rgba(233,221,189,.14);align-items:center}.modern-stats>div:last-child{border:0}.modern-stats b{font:400 42px/.9 var(--display);color:var(--copper-light);letter-spacing:.04em}.modern-stats span{font:500 10px/1.5 var(--mono);letter-spacing:.06em;text-transform:uppercase}.closing-line{position:relative;z-index:2;grid-column:1/-1;border-top:1px solid rgba(233,221,189,.2);padding-top:24px;margin-top:70px;display:flex;justify-content:space-between;font:500 9px var(--mono);letter-spacing:.12em;text-transform:uppercase}.closing-line a{color:var(--copper-light)}

.site-footer{min-height:230px;background:#050f19;padding:50px clamp(24px,6vw,90px);display:grid;grid-template-columns:1fr auto;grid-template-rows:1fr auto;gap:28px;border-top:1px solid rgba(233,221,189,.18);font:500 9px var(--mono);letter-spacing:.08em;text-transform:uppercase}.footer-mark{display:flex;gap:14px;align-items:center}.footer-mark svg{width:50px;fill:none;stroke:var(--copper);stroke-width:1.4}.footer-mark span{font-family:var(--serif);font-weight:600;font-size:15px;letter-spacing:.03em}.footer-mark small{display:block;font:500 7px var(--mono);color:rgba(233,221,189,.5);margin-top:4px}.site-footer p{grid-row:2;margin:0;color:rgba(233,221,189,.5)}.site-footer nav{grid-row:2;display:flex;gap:28px}.site-footer nav a{padding:7px 0;border-bottom:1px solid rgba(233,221,189,.25)}.site-footer nav a:hover{color:var(--copper-light);border-color:var(--copper-light)}

@keyframes routeFlow{to{stroke-dashoffset:-140}}
@keyframes sounder{0%,100%{transform:scaleY(.4);opacity:.45}50%{transform:scaleY(1);opacity:1}}
@keyframes pulseRing{0%{r:7;opacity:1}100%{r:25;opacity:0}}
@keyframes needle{0%,15%{transform:rotate(-92deg)}45%,80%{transform:rotate(2deg)}100%{transform:rotate(-92deg)}}
@keyframes rotate{to{transform:rotate(360deg)}}

@media (max-width:1000px){
  :root{--header-h:68px}.site-header{padding:0 24px}.header-status{display:none}.mark{min-width:auto}.primary-nav{margin-left:auto;margin-right:0}.hero h1{font-size:clamp(96px,17vw,150px)}.hero-deck{margin-left:14vw}.prologue{grid-template-columns:100px 1fr;grid-template-rows:auto auto auto;padding-block:110px}.prologue-title-wrap{grid-column:2;grid-row:1}.prologue-copy{grid-column:2;grid-row:2}.distance-stamp{grid-row:2;grid-column:1}.crossing-head p{max-width:330px}.failure{grid-template-columns:1fr 1fr;gap:50px}.anatomy{grid-template-columns:.75fr 1.25fr;gap:4vw}.cable-specimen{min-height:650px}.ledger{grid-template-columns:1fr}.ledger-heading{max-width:600px}.ledger-heading:after{display:none}.ledger-note{grid-column:1}.now-map{left:10%}
}

@media (max-width:720px){
  body{font-size:16px}.site-header{height:64px;padding:0 16px}.mark svg{width:38px;height:38px}.mark b{font-size:12px}.nav-toggle{display:block;margin-left:auto}.nav-toggle span:not(.sr-only){display:block;height:1px;background:currentColor;margin:6px 0;transition:transform .2s}.nav-toggle[aria-expanded="true"] span:first-child{transform:translateY(3.5px) rotate(45deg)}.nav-toggle[aria-expanded="true"] span:nth-child(2){transform:translateY(-3.5px) rotate(-45deg)}.primary-nav{position:absolute;left:0;right:0;top:64px;display:none;background:#071a2b;padding:12px 18px 20px;border-bottom:1px solid rgba(233,221,189,.22)}.primary-nav.open{display:grid}.primary-nav a{min-height:44px;padding:14px 4px;border-bottom:1px solid rgba(233,221,189,.1)}
  .hero{padding:100px 18px 22px;min-height:840px;justify-content:center}.hero-chart{inset:40px -320px 0 -280px}.hero-coordinates{top:132px;left:20px;right:20px;font-size:7px}.hero h1{font-size:112px;line-height:.71;letter-spacing:.01em}.hero h1 span:last-child{margin-left:0}.issue-line:before{width:32px}.hero-deck{display:block;margin:42px 2px 0}.hero-deck p{font-size:18px}.dive-link{margin-top:24px;justify-content:flex-end}.hero-bottom{grid-template-columns:1fr auto;gap:16px}.hero-bottom p{display:none}.sounder{align-self:center}.hero-bottom b{font-size:46px}
  .prologue{display:block;min-height:0;padding:95px 24px}.prologue>.section-number{margin-bottom:42px}.prologue h2{font-size:57px}.prologue-copy{margin-top:55px}.distance-stamp{width:150px;margin:45px 0 0 auto}.ruled-section:before{inset:10px}
  .crossing{height:260vh}.crossing-sticky{height:100svh;min-height:650px;padding:78px 10px 10px}.crossing-head{display:block;margin:0 6px 10px}.crossing-head h2{font-size:49px}.crossing-head p{font-size:11px;margin-top:5px}.instrument{grid-template-rows:auto minmax(260px,1fr) auto auto}.instrument-topline span:nth-child(2){display:none}.instrument-topline{grid-template-columns:1fr 1fr;font-size:8px}.ocean-profile{width:auto;max-width:none;height:100%;transform:scale(1.22);transform-origin:center}.readout-grid{grid-template-columns:1fr 1fr}.readout-grid>div{padding:6px 8px}.readout-grid>div:nth-child(2){border-right:0}.readout-grid>div:nth-child(-n+2){border-bottom:1px solid rgba(233,221,189,.13)}.readout-grid span{font-size:8px}.readout-grid strong{font-size:18px}.tape-machine{grid-template-columns:1fr}.tape-feed,.relay-state{display:none}.paper-tape{margin:6px 5px;padding:11px 20px 8px;overflow:hidden}.paper-tape output{font-size:11px;letter-spacing:.08em}.crossing-note{display:none}.abyssal-field{padding-inline:20px}.abyssal-field p{font-size:98px;left:22px}.depth-rule{grid-template-columns:65px 1fr;font-size:7px}.depth-rule b{display:none}
  .failure{display:block;padding:84px 24px 95px}.failure h2{font-size:62px}.failure .lead{font-size:19px}.voltage-panel{margin-top:70px;padding:44px 16px 25px}.coil{right:-10px}.voltage-stats{gap:8px}.voltage-stats b{font-size:15px}.failure-verdict{grid-template-columns:58px 1fr;gap:0 15px;margin-top:70px}.failure-verdict i{display:none}.failure-verdict b{font-size:48px;line-height:1;padding:10px 0}.failure-verdict span{font-size:8px;padding:10px 0}blockquote{padding-left:48px;font-size:18px}
  .anatomy{display:block;min-height:0;padding:95px 24px 110px}.anatomy h2{font-size:63px}.cable-specimen{min-height:570px;margin-top:70px}.specimen-ring{inset:0 -90px}.cable-cutaway{width:125%;max-width:none;margin-left:-12.5%}.specimen-caption{right:-5px;bottom:-20px;width:290px}.measure-lines{display:none}
  .ledger{display:block;padding:95px 24px}.ledger h2{font-size:66px}.latency-table{margin-top:60px}.table-head{display:none}.table-row{grid-template-columns:1fr 1fr;min-height:0;padding:22px 0;gap:18px}.table-row>span:nth-child(3){font-size:13px}.table-row>span:nth-child(4){align-self:center}.table-row.feature{margin:0 -14px;padding:25px 14px}.ledger-note{margin-top:35px}
  .now{display:block;min-height:880px;padding:100px 24px 35px}.now-map{inset:100px -300px 0 -350px;opacity:.55}.now h2{font-size:84px}.now-copy>p{font-size:17px}.modern-stats{margin-top:80px}.modern-stats>div{grid-template-columns:100px 1fr;padding:17px}.closing-line{margin-top:70px;gap:25px;line-height:1.5}
  .site-footer{display:flex;flex-direction:column;min-height:300px;padding:42px 24px;gap:30px}.site-footer nav{display:grid;gap:10px}.site-footer nav a{min-height:44px;padding:13px 0}.site-footer p{order:3}
}

@media (max-width:380px){.hero h1{font-size:103px}.prologue h2,.failure h2,.anatomy h2,.ledger h2{font-size:56px}.now h2{font-size:74px}.specimen-caption{width:275px}}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}.reveal{opacity:1;transform:none}.crossing{height:auto}.crossing-sticky{position:relative}.pulse-ring{opacity:.7}}

/* Pass 2: an operating cable room, not a static exhibit. */
h1,h2,h3{text-wrap:balance}
p{text-wrap:pretty}
main section[id]{scroll-margin-top:var(--header-h)}
.site-header{padding-left:max(clamp(20px,4vw,64px),env(safe-area-inset-left));padding-right:max(clamp(20px,4vw,64px),env(safe-area-inset-right))}
.primary-nav a,.dive-link,.closing-line a,.site-footer a{transition:color .22s,border-color .22s,transform .22s}
.primary-nav a:hover,.dive-link:hover,.closing-line a:hover{color:var(--copper-light)}
.mark small,.hero-coordinates,.crossing-note,.site-footer p,.footer-mark small{color:rgba(233,221,189,.72)}
.hero:after{content:"";position:absolute;z-index:1;inset:var(--header-h) auto 0 -12%;width:1px;background:linear-gradient(180deg,transparent 4%,rgba(225,165,109,.85) 50%,transparent 96%);box-shadow:0 0 34px rgba(225,165,109,.45);opacity:0;pointer-events:none}
.loaded .hero:after{animation:surveySweep 1.7s .15s cubic-bezier(.2,.75,.2,1) both}
.hero-chart{transform:scale(1.015);transition:opacity 1.2s,transform 2.4s cubic-bezier(.16,.8,.2,1)}
.loaded .hero-chart{transform:scale(1)}
.hero-route.route-main{stroke-width:2.8;filter:drop-shadow(0 0 4px rgba(212,71,63,.45))}
.hero-transmission{position:absolute;z-index:3;left:clamp(20px,3vw,48px);top:43%;width:32px;display:grid;justify-items:center;gap:5px;color:var(--copper-light);font:600 7px/1 var(--mono);letter-spacing:.12em}
.hero-transmission span{position:absolute;right:25px;top:0;width:145px;text-align:right;white-space:nowrap}
.hero-transmission i{display:block;width:1px;height:clamp(8px,1.1vh,14px);background:rgba(225,165,109,.35)}
.hero-transmission i:nth-of-type(4),.hero-transmission i:nth-of-type(7){height:28px;background:var(--red);box-shadow:0 0 10px rgba(212,71,63,.5)}
.hero-transmission b{font-weight:600;writing-mode:vertical-rl;margin-top:5px}
.loaded .hero-transmission{transition-delay:.55s}

.crossing-head{display:grid;grid-template-columns:minmax(280px,1fr) minmax(420px,.72fr);align-items:end}
.message-key{justify-self:end;width:min(520px,100%);font-family:var(--mono)}
.message-key label{display:block;margin-bottom:6px;color:var(--copper-light);font-size:8px;font-weight:600;letter-spacing:.16em;text-transform:uppercase}
.message-key>div{display:grid;grid-template-columns:1fr auto;border:1px solid rgba(233,221,189,.32);background:#061522;box-shadow:inset 0 0 22px rgba(0,0,0,.35)}
.message-key input{min-width:0;height:44px;border:0;background:transparent;color:var(--cream);padding:0 13px;font:500 12px var(--mono);letter-spacing:.08em;text-transform:uppercase;outline:0}
.message-key input:focus-visible{box-shadow:inset 0 0 0 2px var(--copper-light)}
.message-key button{min-height:44px;border:0;border-left:1px solid rgba(233,221,189,.28);padding:0 18px;background:var(--copper);color:#071a2b;cursor:pointer;font:700 9px var(--mono);letter-spacing:.1em;text-transform:uppercase;transition:background .2s,color .2s}
.message-key button:hover,.message-key button:focus-visible{background:var(--cream);color:var(--ink)}
.message-key small{display:block;margin-top:5px;color:rgba(233,221,189,.65);font-size:9px}
.message-key.message-keyed>div{animation:keyFlash .55s ease-out}
.instrument{grid-template-rows:auto minmax(250px,1fr) auto auto auto;position:relative;isolation:isolate}
.instrument:after{content:"";position:absolute;z-index:4;inset:0 auto 0;left:calc(var(--signal-progress) * 100%);width:1px;background:linear-gradient(transparent,rgba(225,165,109,.1) 20%,rgba(225,165,109,.5) 55%,transparent);pointer-events:none;opacity:.5}
.cable-traversed{fill:none;stroke:var(--red);stroke-width:5;stroke-linecap:round;stroke-dasharray:1;stroke-dashoffset:1;filter:drop-shadow(0 0 5px rgba(212,71,63,.8))}
.repeater-labels{fill:var(--copper-light);font:700 8px var(--mono);letter-spacing:.08em}
.repeater.passed{filter:drop-shadow(0 0 12px #e1a56d)}
.readout-grid strong,.latency-table strong,.table-row b,.modern-stats b{font-variant-numeric:tabular-nums lining-nums}
.readout-grid span{font-size:8px;color:rgba(233,221,189,.7)}
.paper-tape{overflow:hidden}
.paper-tape output{display:block;overflow:hidden;text-overflow:clip}
.signal-arrived .paper-tape{box-shadow:0 0 0 2px var(--red),0 4px 20px rgba(212,71,63,.3)}
.morse-line{height:26px;display:grid;grid-template-columns:130px 1fr;align-items:center;gap:12px;padding:0 14px;border-top:1px solid rgba(233,221,189,.12);overflow:hidden;background:#071725;font:500 8px var(--mono);letter-spacing:.12em;color:rgba(233,221,189,.48)}
.morse-line span{color:var(--copper-light)}
.morse-line output{white-space:nowrap;overflow:hidden;mask-image:linear-gradient(90deg,#000 85%,transparent)}
.crossing-footer{display:grid;grid-template-columns:minmax(220px,.65fr) 1fr;align-items:center;gap:35px;margin-top:10px}
.crossing-note{margin:0;text-align:left;font:500 8px var(--mono);letter-spacing:.08em;text-transform:uppercase}
.signal-progress{display:grid;grid-template-columns:1fr auto;align-items:center;gap:5px 16px;font:600 8px var(--mono);letter-spacing:.1em;color:rgba(233,221,189,.65)}
.signal-progress:before{content:"";grid-column:1/-1;grid-row:1;height:2px;background:rgba(233,221,189,.16)}
.signal-progress i{grid-column:1/-1;grid-row:1;display:block;width:calc(var(--signal-progress) * 100%);height:2px;background:var(--red);box-shadow:0 0 10px rgba(212,71,63,.8);transition:width .08s linear}
.signal-progress span{grid-column:1;grid-row:2;color:var(--copper-light)}
.signal-progress b{grid-column:2;grid-row:2;font-size:10px;color:var(--cream)}
.modern-stats{background:linear-gradient(135deg,rgba(7,26,43,.97),rgba(12,40,61,.96));backdrop-filter:none}
.section-reveal{opacity:1;transform:none}
.section-reveal.in-view{animation:sectionSettle .9s cubic-bezier(.16,.8,.2,1) both}
.site-footer nav a{min-height:44px;display:flex;align-items:center}

@keyframes surveySweep{0%{left:-12%;opacity:0}12%,78%{opacity:.8}100%{left:112%;opacity:0}}
@keyframes keyFlash{0%{box-shadow:0 0 0 0 rgba(225,165,109,.8)}100%{box-shadow:0 0 0 14px transparent}}
@keyframes sectionSettle{from{opacity:.45;transform:translateY(26px)}to{opacity:1;transform:none}}

@media (max-width:1000px){
  .site-header{padding-left:max(24px,env(safe-area-inset-left));padding-right:max(24px,env(safe-area-inset-right))}
  .crossing-head{grid-template-columns:.7fr 1fr}
  .message-key small{display:none}
  .hero-transmission{display:none}
}

@media (max-width:720px){
  .site-header{padding-left:max(16px,env(safe-area-inset-left));padding-right:max(16px,env(safe-area-inset-right))}
  .hero{min-height:860px;padding-bottom:max(22px,env(safe-area-inset-bottom))}
  .hero h1{font-size:clamp(100px,28vw,112px)}
  .hero h1 span:last-child{-webkit-text-stroke-color:rgba(233,221,189,.72)}
  .issue-line{max-width:290px;line-height:1.5}
  .crossing{height:280vh}
  .crossing-sticky{padding:72px 10px 8px}
  .crossing-head{display:grid;grid-template-columns:1fr;gap:8px;margin:0 6px 9px}
  .crossing-head>div{display:flex;align-items:end;justify-content:space-between;gap:10px}
  .crossing-head h2{font-size:44px}
  .message-key{width:100%}
  .message-key label{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
  .message-key input{height:42px;font-size:10px;padding-inline:10px}
  .message-key button{min-height:42px;padding:0 12px;font-size:8px}
  .instrument{grid-template-rows:auto minmax(232px,1fr) auto auto auto}
  .instrument-topline{font-size:7px}
  .instrument:after{display:none}
  .morse-line{height:22px;grid-template-columns:82px 1fr;padding-inline:8px;font-size:6px}
  .crossing-footer{display:block;margin:7px 5px 0}
  .crossing-note{display:none}
  .signal-progress{font-size:6px;gap:3px 8px}
  .signal-progress b{font-size:8px}
  .readout-grid span{font-size:7px}
  .paper-tape output{font-size:10px}
  .section-reveal{transform:none}
  .site-footer{padding-bottom:max(42px,env(safe-area-inset-bottom))}
}

@media (prefers-reduced-motion:reduce){
  .section-reveal,.section-reveal.in-view,.voltage-panel.section-reveal,.cable-specimen.section-reveal,.modern-stats.section-reveal{opacity:1;transform:none}
  .signal-progress i{transition:none}
  .hero:after,.instrument:after{display:none}
}

/* Pass 3: the voltage war becomes a tactile test bench. */
::selection{background:var(--red-ink);color:#fff8e6;text-shadow:none}
html{scrollbar-color:var(--copper) var(--ink-deep);scrollbar-width:thin}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--ink-deep)}
::-webkit-scrollbar-thumb{background:linear-gradient(var(--copper-light),var(--copper));border:3px solid var(--ink-deep);border-radius:9px}
body{font-optical-sizing:auto;font-kerning:normal;text-rendering:optimizeLegibility}
.section-number,.kicker,.issue-line,.readout-grid,.signal-progress,.site-footer,.header-status{font-variant-numeric:tabular-nums lining-nums;font-feature-settings:"kern" 1,"ss02" 1}
.site-header{background:linear-gradient(90deg,rgba(7,26,43,.985),rgba(9,31,49,.97));backdrop-filter:none}
.mark svg{transition:transform .35s cubic-bezier(.2,.75,.2,1),filter .35s}
.mark:hover svg,.mark:focus-visible svg{transform:rotate(-8deg) scale(1.05);filter:drop-shadow(0 0 8px rgba(225,165,109,.4))}
.dive-link:focus-visible svg,.dive-link:hover svg{transform:translateY(6px)}
.closing-line a:hover,.closing-line a:focus-visible,.site-footer a:hover,.site-footer a:focus-visible{transform:translateY(-2px)}
.ruled-section .kicker{color:var(--copper-ink)}
.ruled-section .kicker.red,.failure-copy strong,.gauge text:nth-of-type(3),.voltage-stats span:last-child b,.coil-command output,.coil-test>p{color:var(--red-ink)}
.distance-stamp{color:var(--red-ink);border-color:var(--red-ink);box-shadow:inset 0 0 0 3px var(--paper),inset 0 0 0 4px var(--red-ink)}
.ruled-section :focus-visible,.guide-body :focus-visible{outline-color:var(--red-ink)}

.voltage-panel{--danger-level:0;--needle-angle:-92deg;--danger-glow:0px;--coil-scale:1;isolation:isolate;transition:box-shadow .45s,border-color .45s,background-color .45s}
.voltage-panel:after{content:"";position:absolute;z-index:-1;inset:0;pointer-events:none;background:radial-gradient(circle at 78% 43%,rgba(212,71,63,.25),transparent 44%);opacity:var(--danger-level);transition:opacity .12s linear}
.voltage-panel.is-charging{border-color:rgba(212,71,63,.68);box-shadow:14px 14px 0 rgba(14,42,66,.08),0 0 42px rgba(212,71,63,.13)}
.voltage-panel.is-breached{background-color:rgba(239,219,182,.72)}
.gauge-needle{animation:none;transform:rotate(var(--needle-angle));transition:transform .08s linear}
.coil span{transition:border-color .18s,filter .18s,transform .18s}
.is-charging .coil span{border-color:var(--red);filter:drop-shadow(0 0 4px rgba(212,71,63,.8));transform:scaleY(var(--coil-scale))}
.coil-test{margin-top:20px;padding-top:16px;border-top:1px solid rgba(14,42,66,.28);font-family:var(--mono)}
.insulation-sample{display:grid;grid-template-columns:1fr auto;align-items:center;gap:14px;margin-bottom:12px}
.insulation-sample small{font:600 7px var(--mono);letter-spacing:.11em;color:#486070;white-space:nowrap}
.sample-jacket{position:relative;display:block;height:18px;border:1px solid rgba(14,42,66,.55);border-radius:50%;background:linear-gradient(#d6c695 0 32%,#7d5438 33% 44%,#d7c28a 45% 57%,#7d5438 58% 69%,#c9b477 70%);box-shadow:inset 0 0 0 4px rgba(233,221,189,.48)}
.sample-jacket:after{content:"";position:absolute;left:8px;right:8px;top:50%;height:2px;background:var(--copper);transform:translateY(-50%);box-shadow:0 0 var(--danger-glow) rgba(212,71,63,.85)}
.sample-jacket i{position:absolute;z-index:2;top:3px;width:6px;height:12px;background:var(--red);clip-path:polygon(44% 0,100% 0,62% 42%,100% 55%,22% 100%,41% 58%,0 48%);opacity:0;transform:scale(.2);filter:drop-shadow(0 0 4px var(--red));transition:opacity .12s,transform .22s cubic-bezier(.2,.8,.2,1.4)}
.sample-jacket i:nth-child(1){left:28%}.sample-jacket i:nth-child(2){left:54%}.sample-jacket i:nth-child(3){left:76%}
.coil-test[data-stage="1"] .sample-jacket i:nth-child(1),.coil-test[data-stage="2"] .sample-jacket i:nth-child(-n+2),.coil-test[data-stage="3"] .sample-jacket i{opacity:1;transform:scale(1)}
.coil-command{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(120px,.8fr);border:1px solid rgba(14,42,66,.48);background:rgba(243,234,210,.42)}
.coil-command button{min-height:58px;border:0;border-right:1px solid rgba(14,42,66,.35);padding:9px 13px;background:var(--ink);color:var(--cream);cursor:pointer;text-align:left;text-transform:uppercase;transition:background .2s,color .2s,box-shadow .2s}
.coil-command button span{display:block;font:700 9px/1.25 var(--mono);letter-spacing:.11em}
.coil-command button small{display:block;margin-top:4px;color:rgba(233,221,189,.68);font:500 7px/1.3 var(--mono);letter-spacing:.05em}
.coil-command button:hover,.coil-command button:focus-visible{background:#173f5a;box-shadow:inset 4px 0 0 var(--copper-light)}
.coil-command button[aria-pressed="true"]{background:var(--red-ink);color:#fff8e6;box-shadow:inset 0 0 24px rgba(90,0,0,.3)}
.coil-command button[aria-pressed="true"] small{color:#fff8e6}
.coil-command>div{display:grid;align-content:center;padding:8px 13px}
.coil-command>div span{font:600 7px/1.4 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:#486070}
.coil-command output{font:700 18px/1.2 var(--mono);font-variant-numeric:tabular-nums lining-nums;color:var(--red)}
.coil-test>p{margin:10px 0 0;color:var(--red);font:600 7px/1.45 var(--mono);letter-spacing:.07em;text-transform:uppercase}
.voltage-panel.is-breached .coil-test>p{animation:faultBlink .7s steps(2,end) 3}
@keyframes faultBlink{50%{opacity:.28}}

@media (max-width:720px){
  .voltage-panel{padding-bottom:20px}
  .coil-command{grid-template-columns:minmax(0,1.15fr) minmax(112px,.85fr)}
  .coil-command button{min-height:62px;padding-inline:10px}
  .coil-command output{font-size:16px}
  .insulation-sample small{font-size:6px}
}
@media (prefers-reduced-motion:reduce){
  .gauge-needle,.voltage-panel:after,.sample-jacket i{transition:none}
  .voltage-panel.is-breached .coil-test>p{animation:none}
}