:root{color-scheme:light;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
body{margin:0;font:14px/1.4 system-ui,sans-serif}img{max-width:100%}[hidden]{display:none!important}
/* Layout: one pinned stage where a pen sketch in Leonardo's manner, drawn from a real MR and CT, is scanned and
   reconstructed into a CT slice on film; below it two product folios and a plain start guide on the same paper. */
:root{
  --bg:#ece3cf;          /* laid paper of a notebook sheet */
  --bg-2:#e3d8c1;
  --surface:#f5efe1;
  --fg:#2a1f17;
  --muted:#6b5b4b;
  --line:rgba(42,31,23,.18);
  --accent:#a3462c;      /* sanguine, red chalk */
  --cta-bg:#2a1f17;
  --cta-fg:#f5efe1;
  --stage-paper:#ece3cf;
  --stage-ink:#3a2a1d;   /* iron-gall ink */
  --stage-red:#a3462c;
  --ground-rgb:236,227,207;
  --film:#091013;        /* radiographic film base */
  --film-2:#111b1f;
  --lume:#e4ebe7;
  --lume-soft:#92a4a6;
  --film-red:#d47c60;
  --f-display:"Cormorant Garamond","Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;
  --f-body:"IBM Plex Sans","Segoe UI",system-ui,-apple-system,sans-serif;
  --f-mono:"IBM Plex Mono",ui-monospace,"Cascadia Mono",Consolas,monospace;
  --gut:max(16px, env(safe-area-inset-left, 0px));
  --gut-r:max(16px, env(safe-area-inset-right, 0px));
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#16120e;--bg-2:#1c1712;--surface:#241d17;--fg:#ece3d2;--muted:#b0a08b;--line:rgba(236,227,210,.15);
    --accent:#de8a68;--cta-bg:#ece3d2;--cta-fg:#16120e;--stage-paper:#1a1511;--stage-ink:#e6dac4;--stage-red:#de8a68;
    --ground-rgb:26,21,17;color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#16120e;--bg-2:#1c1712;--surface:#241d17;--fg:#ece3d2;--muted:#b0a08b;--line:rgba(236,227,210,.15);
  --accent:#de8a68;--cta-bg:#ece3d2;--cta-fg:#16120e;--stage-paper:#1a1511;--stage-ink:#e6dac4;--stage-red:#de8a68;
  --ground-rgb:26,21,17;color-scheme:dark;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto}}
body{background:var(--bg);color:var(--fg);font:400 1.0625rem/1.6 var(--f-body);-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:30;background:var(--bg)}
a{color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
h1,h2,h3{font-family:var(--f-display);font-weight:600;line-height:1.02;letter-spacing:-.01em;text-wrap:balance;margin:0}
p{margin:0}
.ry{font-style:italic;font-weight:500;letter-spacing:-.02em}
.eyebrow{font:500 .75rem/1.3 var(--f-mono);letter-spacing:.14em;text-transform:uppercase}
.wrap{max-width:1200px;margin:0 auto;padding-left:var(--gut);padding-right:var(--gut)}

/* header */
.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;
  background:color-mix(in srgb, var(--bg) 84%, transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);transition:background-color .4s,color .4s,border-color .4s}
.top.on-film{background:color-mix(in srgb, var(--film) 78%, transparent);color:var(--lume);border-color:rgba(228,235,231,.12)}
.top .wrap{display:flex;align-items:center;gap:1.5rem;padding-block:.7rem}
.mark{display:flex;align-items:baseline;gap:.45rem;text-decoration:none}
.mark b{font:500 1.75rem/1 var(--f-display);font-style:italic;letter-spacing:-.03em}
.mark span{font:500 .72rem/1 var(--f-mono);letter-spacing:.32em;text-transform:uppercase}
.nav{display:flex;gap:1.4rem;margin-left:auto;font-size:.92rem}
.nav a{text-decoration:none;opacity:.82}
.nav a:hover{opacity:1;text-decoration:underline;text-underline-offset:4px}
.btn{display:inline-flex;align-items:center;gap:.5rem;font:500 .95rem/1 var(--f-body);text-decoration:none;
  padding:.8rem 1.15rem;border-radius:2px;border:1px solid transparent;cursor:pointer;white-space:nowrap}
.btn.solid{background:var(--cta-bg);color:var(--cta-fg)}
.btn.solid:hover{filter:brightness(1.15)}
.btn.line{border-color:currentColor;background:transparent;color:inherit}
.btn.line:hover{background:color-mix(in srgb, currentColor 8%, transparent)}
.btn[aria-disabled="true"]{opacity:.55;cursor:default}
.top .btn{padding:.6rem .95rem;font-size:.9rem}
.top.on-film .btn.solid{background:var(--lume);color:var(--film)}

/* tour: pinned stage */
#tour{position:relative;height:660vh}
.stage{position:sticky;top:0;height:100vh;height:100svh;overflow:hidden;background:var(--stage-paper)}
.stage canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.copy{position:absolute;inset:0;pointer-events:none}
.ch{position:absolute;left:max(16px, 6vw, env(safe-area-inset-left,0px));top:50%;width:min(31rem, 32vw);
  transform:translateY(-50%);color:var(--stage-ink);pointer-events:auto;display:grid;gap:1.1rem}
.ch.film{color:var(--lume)}
.ch .eyebrow{color:var(--stage-red)}
.ch.film .eyebrow{color:var(--film-red)}
.ch h1{font-size:clamp(2.7rem, 5.4vw, 5.1rem)}
.ch h2{font-size:clamp(2.2rem, 3.9vw, 3.6rem)}
.ch p{font-size:1.06rem;max-width:34em}
.ch .acts{display:flex;flex-wrap:wrap;gap:.7rem;margin-top:.3rem}
.ch.film .btn.solid{background:var(--lume);color:var(--film)}
.skip{position:absolute;right:var(--gut-r);bottom:max(18px, env(safe-area-inset-bottom,0px));z-index:3;
  font:500 .72rem/1 var(--f-mono);letter-spacing:.14em;text-transform:uppercase;color:var(--stage-ink);opacity:.7}
.skip.film{color:var(--lume)}
.ticks{position:absolute;right:var(--gut-r);top:50%;transform:translateY(-50%);display:grid;gap:.55rem;z-index:3}
.ticks i{display:block;width:18px;height:2px;background:currentColor;opacity:.25;transition:opacity .3s,width .3s;color:var(--stage-ink)}
.ticks.film i{color:var(--lume)}
.ticks i.on{opacity:.9;width:28px}

/* no-JS: chapters flow normally */
html:not(.js) #tour{height:auto}
html:not(.js) .stage{position:relative;height:auto;padding-block:5rem}
html:not(.js) .stage canvas,html:not(.js) .ticks{display:none}
html:not(.js) .copy{position:relative;display:grid;gap:4rem;padding-left:var(--gut);padding-right:var(--gut)}
html:not(.js) .ch{position:relative;left:auto;top:auto;transform:none;width:auto;max-width:40rem}
html:not(.js) .ch.film{color:var(--stage-ink)}

@media (max-width: 999px){
  #tour{height:580vh}
  .ch{left:var(--gut);right:var(--gut-r);width:auto;top:auto;bottom:max(64px, calc(env(safe-area-inset-bottom,0px) + 56px));transform:none;gap:.8rem}
  .ch h1{font-size:clamp(2.3rem, 10.5vw, 3.2rem)}
  .ch h2{font-size:clamp(1.9rem, 8.6vw, 2.6rem)}
  .ch p{font-size:1rem}
  .js .stage::after{content:"";position:absolute;inset:auto 0 0;height:56%;pointer-events:none;
    background:linear-gradient(to top, rgba(var(--ground-rgb),.97) 52%, rgba(var(--ground-rgb),0))}
  .copy{z-index:2}
  .ticks{display:none}
  .ch{max-width:38rem}
}
@media (max-width: 760px){
  .nav{display:none}
  .top .wrap{justify-content:space-between}
}

/* folios */
section.folio{padding-block:clamp(4.5rem, 10vw, 8.5rem);border-top:1px solid var(--line)}
section.folio.alt{background:var(--bg-2)}
.folio-grid{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:clamp(2rem, 5vw, 5rem);align-items:start}
.folio-grid.rev{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.folio h2{font-size:clamp(3rem, 6.5vw, 5.6rem);margin-block:.6rem 1.2rem}
.folio .eyebrow{color:var(--accent)}
.lede{font-size:1.18rem;line-height:1.55;max-width:32em;color:var(--fg)}
.feat{display:grid;gap:1.25rem;margin:2.2rem 0 0;padding-top:1.6rem;border-top:1px solid var(--line)}
.feat div{display:grid;grid-template-columns:8.5rem minmax(0,1fr);gap:1rem}
.feat dt{font:500 .72rem/1.6 var(--f-mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted);padding-top:.2rem}
.feat dd{margin:0}
.acts{display:flex;flex-wrap:wrap;gap:.7rem;margin-top:2rem}
.note{font-size:.88rem;color:var(--muted);margin-top:1rem;max-width:34em}

.monitor{margin:0;background:var(--film);color:var(--lume);padding:clamp(10px, 1.4vw, 16px);border-radius:3px;
  box-shadow:0 1px 0 rgba(255,255,255,.04) inset, 0 30px 60px -30px rgba(9,16,19,.55)}
.monitor canvas{display:block;width:100%;height:auto;max-width:100%;touch-action:none;cursor:crosshair}
.monitor figcaption{display:flex;flex-wrap:wrap;justify-content:space-between;gap:.4rem 1.2rem;
  font:400 .78rem/1.5 var(--f-mono);color:var(--lume-soft);padding:.8rem .2rem .1rem}
.monitor figcaption strong{color:var(--lume);font-weight:500}
#mpr-pt{color:var(--lume);font-variant-numeric:tabular-nums}

ol.flow{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4, minmax(0,1fr));gap:0;
  border-top:1px solid var(--fg)}
ol.flow li{padding:1.1rem 1.1rem 1.4rem 0;display:grid;gap:.55rem;align-content:start;border-right:1px solid var(--line);padding-left:1.1rem}
ol.flow li:first-child{padding-left:0}
ol.flow li:last-child{border-right:0}
.num{font:500 2.6rem/1 var(--f-display);font-variant-numeric:oldstyle-nums;color:var(--accent)}
ol.flow h3{font-size:1.5rem}
ol.flow p{font-size:.95rem;color:var(--muted)}
.dest{display:flex;flex-wrap:wrap;gap:.4rem;margin-top:.2rem}
.dest span{font:500 .72rem/1 var(--f-mono);letter-spacing:.06em;border:1px solid var(--line);padding:.35rem .5rem;border-radius:2px}
.plate{margin:2.4rem 0 0;display:grid;gap:.6rem}
.plate canvas{display:block;width:100%;max-width:min(100%, 440px);aspect-ratio:788/756;height:auto}
.plate figcaption{font:italic 500 1.05rem/1.4 var(--f-display);color:var(--muted)}

/* start */
.start-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(2.5rem, 6vw, 6rem)}
ol.steps{list-style:none;margin:2rem 0 0;padding:0;display:grid;gap:0}
ol.steps li{display:grid;grid-template-columns:3rem minmax(0,1fr);gap:1rem;padding:1.2rem 0;border-top:1px solid var(--line)}
ol.steps h3{font-size:1.45rem;margin-bottom:.3rem}
ol.steps p{color:var(--muted);font-size:.98rem}
.demo{margin:0;background:var(--surface);padding:clamp(1.2rem, 3vw, 2rem);border-radius:2px}
.demo h3{font-size:1.6rem}
.demo > p{font-size:.95rem;color:var(--muted);margin-top:.4rem}
.bars{display:grid;grid-template-columns:repeat(7, minmax(0,1fr));gap:.5rem;align-items:end;height:12rem;margin-top:1.6rem;
  border-bottom:1px solid var(--fg)}
.bar{display:flex;flex-direction:column;justify-content:flex-end;height:100%;gap:.35rem}
.bar i{display:block;background:var(--fg);height:var(--h)}
.bar.end i{height:0}
.bar b{font:500 .78rem/1 var(--f-mono);text-align:center;font-variant-numeric:tabular-nums}
.bar.end b{color:var(--accent)}
.bar-x{display:grid;grid-template-columns:repeat(7, minmax(0,1fr));gap:.5rem;font:400 .72rem/1 var(--f-mono);color:var(--muted);
  text-align:center;padding-top:.5rem}
.facts{list-style:none;margin:1.6rem 0 0;padding:0;display:grid;gap:.9rem}
.facts li{display:grid;grid-template-columns:9rem minmax(0,1fr);gap:1rem;font-size:.95rem;padding-top:.9rem;border-top:1px solid var(--line)}
.facts b{font:500 .72rem/1.6 var(--f-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}

footer{border-top:1px solid var(--line);padding-block:3rem max(3rem, env(safe-area-inset-bottom,0px));font-size:.9rem;color:var(--muted)}
.foot{display:flex;flex-wrap:wrap;gap:1.5rem 3rem;justify-content:space-between;align-items:flex-start}
.foot .mark{color:var(--fg)}
.foot ul{list-style:none;margin:0;padding:0;display:grid;gap:.4rem}
.foot a{text-underline-offset:3px}
.credits{flex-basis:100%;font-size:.8rem;line-height:1.55;max-width:60rem;padding-top:1.2rem;border-top:1px solid var(--line)}

@media (max-width: 900px){
  .folio-grid,.folio-grid.rev,.start-grid{grid-template-columns:minmax(0,1fr)}
  .folio-grid.rev > :first-child{order:2}
  ol.flow{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  ol.flow li:nth-child(2){border-right:0}
  ol.flow li:nth-child(3){padding-left:0}
  ol.flow li:nth-child(n+3){border-top:1px solid var(--line)}
}
@media (max-width: 520px){
  ol.flow{grid-template-columns:minmax(0,1fr)}
  ol.flow li{padding-left:0;border-right:0;border-top:1px solid var(--line)}
  ol.flow li:first-child{border-top:0}
  .feat div,.facts li{grid-template-columns:minmax(0,1fr);gap:.2rem}
}