:root{
  --ink:#16222E;
  --ink-soft:#3B4B58;
  --paper:#EEF2F4;
  --steel:#C3CDD3;
  --lake:#1B6A9E;
  --signal:#3DBE6B;
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,"Book Antiqua",Georgia,serif;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);
  font-size:1.0625rem;line-height:1.6}
img,svg{display:block;max-width:100%}
a{color:var(--lake);text-underline-offset:.2em}
a:hover{color:var(--ink)}
:focus-visible{outline:3px solid var(--lake);outline-offset:3px}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:var(--paper);
  padding:.75rem 1rem;z-index:10}
.skip:focus{left:0}
.wrap{width:min(1120px,100% - 2.5rem);margin-inline:auto}

h1,h2,h3{font-family:var(--serif);font-weight:700;margin:0;letter-spacing:-.015em}
h1{font-size:clamp(2.4rem,1.2rem + 4.6vw,4.25rem);line-height:1.04;letter-spacing:-.025em}
h2{font-size:clamp(1.65rem,1.1rem + 1.8vw,2.4rem);line-height:1.15}
h3{font-size:1.3rem;line-height:1.25}
p{margin:0 0 1em;max-width:62ch}

/* header */
.top{padding-block:1.25rem}
.top .wrap{display:flex;align-items:baseline;justify-content:space-between;gap:1.5rem;flex-wrap:wrap}
.mark{font-family:var(--serif);font-weight:700;font-size:1.5rem;letter-spacing:.06em;
  color:var(--ink);text-decoration:none}
.nav{display:flex;gap:1.5rem;flex-wrap:wrap}
.nav a{color:var(--ink);text-decoration:none;font-size:.98rem}
.nav a:hover{text-decoration:underline}

/* hero */
.hero{padding-block:clamp(2rem,5vw,4rem) clamp(3rem,7vw,5.5rem)}
.hero .wrap{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);
  gap:clamp(2rem,5vw,4.5rem);align-items:center}
.lede{font-size:clamp(1.1rem,1rem + .5vw,1.3rem);line-height:1.55;margin-top:1.5rem;color:var(--ink-soft)}
.actions{display:flex;gap:.9rem;flex-wrap:wrap;margin-top:2rem}
.btn{display:inline-block;padding:.85rem 1.35rem;border:2px solid var(--ink);border-radius:2px;
  font-weight:600;text-decoration:none;color:var(--ink);background:transparent;line-height:1.2}
.btn:hover{background:var(--ink);color:var(--paper)}
.btn-primary{background:var(--ink);color:var(--paper)}
.btn-primary:hover{background:var(--lake);border-color:var(--lake);color:#fff}
.where{margin:1.75rem 0 0;font-size:.95rem;color:var(--ink-soft)}
.figure{margin:0;justify-self:end;width:100%;max-width:400px}
.figure figcaption{margin-top:.9rem;font-size:.9rem;color:var(--ink-soft);line-height:1.45}

/* bands */
.band{padding-block:clamp(3rem,7vw,5.5rem);border-top:1px solid var(--steel)}
.band > .wrap > h2{max-width:22ch}
.band-body{margin-top:1.5rem}

/* steps: a real sequence, so numbers stay */
.steps{list-style:none;margin:2.5rem 0 0;padding:0;counter-reset:step}
.steps li{counter-increment:step;display:grid;grid-template-columns:4rem minmax(0,1fr) minmax(0,1.7fr);
  gap:.5rem 2rem;padding-block:1.6rem;border-top:1px solid var(--steel)}
.steps li:last-child{border-bottom:1px solid var(--steel)}
.steps li::before{content:counter(step);font-family:var(--serif);font-weight:700;
  font-size:2.6rem;line-height:1;color:var(--lake)}
.steps p{margin:0}

/* build status */
.status{margin:2.5rem 0 0;padding:0}
.status .row{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1.9fr) 8.5rem;
  gap:.35rem 2rem;padding-block:1.1rem;border-top:1px solid var(--steel);align-items:baseline}
.status .row:last-child{border-bottom:1px solid var(--steel)}
.status dt{font-weight:600}
.status dd{margin:0}
.status dd.detail{color:var(--ink-soft)}
.state{display:inline-flex;align-items:center;gap:.55rem;font-size:.95rem;font-weight:600}
.state::before{content:"";width:.7rem;height:.7rem;border-radius:50%;border:2px solid var(--ink-soft);flex:none}
.state.built::before{background:var(--signal);border-color:var(--signal)}
.state.underway::before{background:var(--lake);border-color:var(--lake)}
.state.planned::before{background:transparent}

/* get involved pair */
.pair{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(2rem,5vw,4.5rem)}
.pair h2{max-width:16ch}
.pair .btn{margin-top:.75rem}

/* footer */
.foot{background:var(--ink);color:var(--paper);padding-block:2.5rem}
.foot .wrap{display:flex;justify-content:space-between;gap:1.5rem;flex-wrap:wrap;align-items:baseline}
.foot a{color:var(--paper)}
.foot a:hover{color:var(--steel)}
.foot p{margin:0;font-size:.95rem;max-width:none}

/* rack illustration */
.rack{width:100%;height:auto}
.cab{fill:#1A2732}
.rail{fill:#0E1820}
.hole{fill:#33434F}
.f-switch{fill:#D5DDE2}
.f-a{fill:#C9D3D9}
.f-b{fill:#AFBCC5}
.f-c{fill:#2C3A46}
.f-d{fill:#C1CBD2}
.f-blank{fill:#233240}
.f-pdu{fill:#101A22}
.bay,.port,.slot,.btn-round{fill:#22303B}
.bay-dark{fill:#131D26;stroke:#4A5A67;stroke-width:1}
.btn-dark{fill:#131D26;stroke:#4A5A67;stroke-width:1}
.slot-lite{fill:#3A4B58}
.plate{fill:#22303B;opacity:.16}
.outlet{fill:#2E3E4B}
.lcd{fill:#1F3B2C;stroke:#3DBE6B;stroke-width:.75}
.empty{fill:none;stroke:#5A6B78;stroke-width:1.25;stroke-dasharray:5 5}
.led{fill:#3DBE6B;animation:powerup .4s ease-out both}
@keyframes powerup{from{fill:#37434D}to{fill:#3DBE6B}}
.d1{animation-delay:0.66s}
.d2{animation-delay:0.82s}
.d3{animation-delay:0.98s}
.d4{animation-delay:1.14s}
.d5{animation-delay:1.30s}
.d6{animation-delay:1.46s}
.d7{animation-delay:1.62s}
.d8{animation-delay:1.78s}
.d9{animation-delay:1.94s}
.d10{animation-delay:2.10s}
.d11{animation-delay:2.26s}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .led{animation:none}
}

@media (max-width:860px){
  .hero .wrap{grid-template-columns:minmax(0,1fr)}
  .figure{justify-self:start;max-width:340px}
  .pair{grid-template-columns:minmax(0,1fr)}
  .steps li{grid-template-columns:3rem minmax(0,1fr);gap:.4rem 1.25rem}
  .steps li > p{grid-column:2}
  .status .row{grid-template-columns:minmax(0,1fr);gap:.3rem}
}

.nf .wrap{display:block}