@font-face{font-family:"Oswald";src:url("./fonts/Oswald-Var.ttf") format("truetype");
  font-weight:200 700;font-display:swap}
@font-face{font-family:"Anton";src:url("./fonts/Anton-Regular.ttf") format("truetype");
  font-weight:400;font-display:swap}

:root{
  --ink:#0A0B0D; --ink2:#0E1013; --panel:#14161B; --panel2:#191C22;
  --line:#22262E; --line2:#2E333C;
  --hi:#EAEBEE; --mid:#989EA9; --lo:#666C76;
  --accent:#38BDF8; --accent-dim:#38bdf828;
  --mono:ui-monospace,"SF Mono","JetBrains Mono",Menlo,Consolas,monospace;
  --pad:clamp(18px,4vw,54px);
  --tr:.45s cubic-bezier(.22,.61,.36,1);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--ink);color:var(--hi);
  font-family:"Oswald",system-ui,sans-serif;font-weight:300;
  font-size:16px;line-height:1.55;-webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-weight:500;margin:0;line-height:1.08}
p{margin:0}
.mono{font-family:var(--mono);font-size:.84em;letter-spacing:-.01em}

/* ---------------------------------------------------------------- topbar */
.topbar{
  display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap;
  padding:14px var(--pad);border-bottom:1px solid var(--line);
  position:sticky;top:0;z-index:40;background:#0A0B0DEE;backdrop-filter:blur(14px);
}
.mark{display:flex;align-items:baseline;gap:9px;text-decoration:none;color:inherit}
.mark-1{font-family:"Anton",sans-serif;font-size:20px;letter-spacing:.02em;color:var(--hi)}
.mark-2{font-family:"Oswald";font-weight:500;font-size:11px;letter-spacing:.30em;
  color:var(--accent);transition:color var(--tr)}
.mark.small .mark-1{font-size:16px}
.topmeta{display:flex;gap:26px;margin:0;flex-wrap:wrap}
.topmeta div{display:flex;flex-direction:column;gap:1px}
.topmeta dt{font-size:9.5px;letter-spacing:.19em;text-transform:uppercase;color:var(--lo)}
.topmeta dd{margin:0;font-family:var(--mono);font-size:11.5px;color:var(--mid)}

/* ------------------------------------------------------------------ hero */
.hero{scroll-margin-top:70px;padding:clamp(40px,7vw,84px) var(--pad) clamp(26px,3.4vw,38px);max-width:1560px}
.eyebrow{font-size:10.5px;letter-spacing:.26em;text-transform:uppercase;color:var(--lo);
  margin-bottom:20px;display:flex;align-items:center;gap:12px}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--accent);
  transition:background var(--tr)}
h1{font-size:clamp(34px,6.1vw,74px);font-weight:400;letter-spacing:-.005em;max-width:15ch}
.lede{margin-top:22px;max-width:62ch;color:var(--mid);font-size:clamp(14.5px,1.35vw,17px)}

/* ----------------------------------------------------------------- stage */
.stage{
  scroll-margin-top:84px;
  margin:0 var(--pad) clamp(52px,7vw,96px);border:1px solid var(--line);
  background:linear-gradient(180deg,var(--panel) 0%,var(--ink2) 100%);
  display:grid;grid-template-columns:minmax(0,1fr) 232px;
  grid-template-areas:"vp rail" "idx idx";
}
.viewport{grid-area:vp;position:relative;height:clamp(430px,66vh,760px);overflow:hidden}
.viewport canvas{display:block;width:100%!important;height:100%!important;
  touch-action:none;cursor:grab}
.viewport canvas:active{cursor:grabbing}
.loader{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  gap:12px;font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--lo);
  transition:opacity .5s;pointer-events:none;background:var(--ink2)}
.loader.gone{opacity:0}
.loader span{width:22px;height:1px;background:var(--accent);animation:sweep 1.1s infinite ease-in-out}
@keyframes sweep{0%,100%{transform:scaleX(.25);opacity:.4}50%{transform:scaleX(1);opacity:1}}

.rail{grid-area:rail;border-left:1px solid var(--line);padding:22px 20px;
  display:flex;flex-direction:column;gap:26px}
.railgroup-end{margin-top:auto;display:flex;flex-direction:column;gap:12px}
.railtitle{font-size:9.5px;letter-spacing:.22em;text-transform:uppercase;color:var(--lo);
  margin-bottom:10px}
.seg{display:flex;flex-direction:column;border:1px solid var(--line2)}
.seg button{
  appearance:none;background:none;border:0;border-bottom:1px solid var(--line2);
  color:var(--mid);font-family:"Oswald";font-weight:400;font-size:12.5px;
  letter-spacing:.09em;text-transform:uppercase;text-align:left;
  padding:10px 13px;cursor:pointer;transition:color .2s,background .2s;
}
.seg button:last-child{border-bottom:0}
.seg-thin button{padding:8px 13px;font-size:11.5px}
.seg button:hover{color:var(--hi);background:#ffffff08}
.seg button.on{color:var(--ink);background:var(--accent);font-weight:500;
  transition:background var(--tr)}
.seg button:focus-visible,.spin:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

.spin{display:flex;align-items:center;gap:9px;appearance:none;background:none;
  border:1px solid var(--line2);color:var(--mid);font-family:"Oswald";font-size:11px;
  letter-spacing:.16em;text-transform:uppercase;padding:9px 12px;cursor:pointer}
.spin .dot{width:6px;height:6px;border-radius:50%;background:var(--lo);transition:background var(--tr)}
.spin.on{color:var(--hi)}
.spin.on .dot{background:var(--accent);box-shadow:0 0 10px var(--accent)}
.readout{font-family:var(--mono);font-size:11px;color:var(--lo);letter-spacing:.02em}

/* colour index -- the signature strip */
.index{grid-area:idx;display:grid;grid-template-columns:repeat(8,1fr);
  border-top:1px solid var(--line)}
.sw{
  appearance:none;background:none;border:0;border-right:1px solid var(--line);
  padding:14px 12px 13px;cursor:pointer;text-align:left;position:relative;min-width:0;
  display:flex;flex-direction:column;gap:9px;transition:background .25s;
}
.sw:last-child{border-right:0}
.sw:hover{background:#ffffff06}
.sw:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}
.sw .bar{height:4px;background:var(--c);opacity:.42;transition:opacity .3s,height .3s}
.sw .num{font-family:var(--mono);font-size:10px;color:var(--lo)}
.sw .nm{font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--mid);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sw[aria-checked="true"]{background:#ffffff09}
.sw[aria-checked="true"] .bar{opacity:1;height:9px}
.sw[aria-checked="true"] .nm{color:var(--hi)}
.sw[aria-checked="true"] .num{color:var(--c)}

/* ----------------------------------------------------------------- main */
main{padding:0 var(--pad)}
.block{scroll-margin-top:84px;padding:clamp(44px,6vw,78px) 0;border-top:1px solid var(--line);max-width:1560px}
.block-last{padding-bottom:clamp(56px,7vw,92px)}
h2{font-size:clamp(21px,2.5vw,30px);font-weight:400;display:flex;align-items:baseline;gap:16px;
  margin-bottom:26px}
.h2n{font-family:var(--mono);font-size:12px;color:var(--accent);transition:color var(--tr)}
.blurb{color:var(--mid);max-width:70ch;margin-bottom:26px;font-size:15px}

.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(340px,1fr));gap:1px;
  background:var(--line);border:1px solid var(--line)}
.card{background:var(--panel);padding:26px 24px 24px}
.card header{margin-bottom:20px}
.card h3{font-size:19px;font-weight:500;letter-spacing:.01em}
.tag{font-size:11px;letter-spacing:.13em;text-transform:uppercase;color:var(--lo);margin-top:5px}
.spec{margin:0;display:flex;flex-direction:column}
.spec div{display:flex;justify-content:space-between;gap:18px;align-items:baseline;
  padding:8px 0;border-bottom:1px dotted var(--line2)}
.spec dt{font-size:12.5px;color:var(--mid);letter-spacing:.03em}
.spec dd{margin:0;color:var(--hi);text-align:right}
.note{margin-top:18px;font-size:13px;color:var(--lo);line-height:1.6;
  border-left:2px solid var(--accent);padding-left:13px;transition:border-color var(--tr)}

.tablewrap{overflow-x:auto;border:1px solid var(--line)}
.grid{width:100%;border-collapse:collapse;min-width:600px}
.grid th{font-size:9.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--lo);
  font-weight:400;text-align:left;padding:12px 18px;background:var(--panel2);
  border-bottom:1px solid var(--line)}
.grid td{padding:11px 18px;border-bottom:1px solid var(--line);font-size:14px;color:var(--mid)}
.grid tr:last-child td{border-bottom:0}
.grid tr.on td{background:#ffffff07;color:var(--hi)}
.grid tbody tr{cursor:pointer;transition:background .2s}
.grid tbody tr:hover td{background:#ffffff05}
.chip{display:inline-flex;align-items:center;gap:9px}
.chip i{width:11px;height:11px;background:var(--c);display:block}

.files{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1px;
  background:var(--line);border:1px solid var(--line)}
.file{background:var(--panel);padding:20px 22px;text-decoration:none;color:inherit;
  display:flex;flex-direction:column;gap:6px;transition:background .2s}
.file:hover{background:var(--panel2)}
.file:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}
.file b{font-weight:500;font-size:14.5px;display:flex;justify-content:space-between;gap:12px}
.file b i{font-style:normal;color:var(--accent);font-family:var(--mono);font-size:11px;
  transition:color var(--tr)}
.file span{font-size:12.5px;color:var(--lo)}

.steps{margin:0;padding:0;list-style:none;counter-reset:s;
  display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:1px;
  background:var(--line);border:1px solid var(--line)}
.steps li{background:var(--panel);padding:24px;counter-increment:s}
.steps li::before{content:counter(s,decimal-leading-zero);font-family:var(--mono);
  font-size:11px;color:var(--accent);display:block;margin-bottom:12px;transition:color var(--tr)}
.steps h4{font-size:15.5px;font-weight:500;margin-bottom:9px}
.steps p{font-size:13.5px;color:var(--mid);line-height:1.65}
.code{margin:14px 0 0;padding:13px;background:var(--ink);border:1px solid var(--line);
  overflow-x:auto;font-family:var(--mono);font-size:11px;line-height:1.7;color:var(--mid)}
.code .c{color:var(--lo)}
.code .n{color:var(--accent);transition:color var(--tr)}

.notes{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:14px;
  max-width:88ch}
.notes li{padding-left:22px;position:relative;font-size:14.5px;color:var(--mid);line-height:1.6}
.notes li::before{content:"";position:absolute;left:0;top:11px;width:9px;height:1px;
  background:var(--accent);transition:background var(--tr)}
.notes b{color:var(--hi);font-weight:500}

footer{border-top:1px solid var(--line);padding:26px var(--pad) 40px;
  display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;align-items:center}
.fmeta{font-size:11.5px;color:var(--lo)}

@media (max-width:900px){
  .stage{grid-template-columns:1fr;grid-template-areas:"vp" "rail" "idx"}
  .rail{border-left:0;border-top:1px solid var(--line);flex-direction:row;flex-wrap:wrap;
    gap:20px;align-items:flex-end}
  .railgroup-end{margin-top:0;flex-direction:row;align-items:center;gap:14px}
  .seg{flex-direction:row}
  .seg button{border-bottom:0;border-right:1px solid var(--line2)}
  .seg button:last-child{border-right:0}
  .viewport{height:clamp(360px,54vh,560px)}
  .index{grid-template-columns:repeat(4,1fr)}
  .sw{padding:11px 9px 10px}
  .sw .nm{font-size:11px;letter-spacing:.02em}
  .sw:nth-child(4){border-right:0}
  .sw:nth-child(-n+4){border-bottom:1px solid var(--line)}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms!important;transition-duration:.01ms!important}
  html{scroll-behavior:auto}
}

@media (max-width:520px){
  .index{grid-template-columns:repeat(2,1fr)}
  .sw{border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
  .sw:nth-child(2n){border-right:0}
  .sw:nth-child(n+7){border-bottom:0}
  .topmeta{gap:16px}
}