/* Layout: the scene fills the screen; one glass panel holds the story and the controls
   (a left rail on wide screens, a bottom sheet on phones). */
:root{
  --bg:#05070F; --ink:#EAF0FF; --ink2:#AAB6D6; --ink3:#7C88B0; --line:rgba(234,240,255,.14);
  --glass:rgba(7,11,24,.66); --focus:#9FB4FF;
  --vesicle:#f7b04d; --plasma:#5791e0;
  --display:'Bricolage Grotesque','Helvetica Neue',Arial,sans-serif;
  --body:'Source Sans 3','Segoe UI',Roboto,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,Menlo,monospace;
  color-scheme:dark;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{height:100%;margin:0;background:var(--bg);color:var(--ink);font-family:var(--body);font-size:16px;line-height:1.45;overflow:hidden;overscroll-behavior:none}
#view{position:fixed;inset:0;width:100%;height:100%;display:block;touch-action:none;cursor:grab;outline:none}
#view:active{cursor:grabbing}
:focus-visible{outline:2px solid var(--focus);outline-offset:3px}

/* Labels pinned to things in the scene */
#labels{position:fixed;inset:0;pointer-events:none;overflow:hidden;z-index:3}
#labels.off{display:none}
.tag{position:absolute;left:0;top:0;display:flex;align-items:center;gap:7px;font-size:12px;font-weight:600;letter-spacing:.01em;color:var(--ink);white-space:nowrap;text-shadow:0 1px 3px rgba(3,5,12,.95),0 0 10px rgba(3,5,12,.9);opacity:0;transition:opacity .3s;will-change:transform}
.tag.on{opacity:.94}
.tag.far{font-weight:400;color:var(--ink2);font-style:italic}
.tag::before{content:"";width:5px;height:5px;margin-left:-2.5px;border-radius:50%;background:var(--ink);box-shadow:0 0 0 3px rgba(234,240,255,.2);flex:none}
.tag::after{content:"";order:-1;display:none}
.tag span{padding-left:14px;position:relative}
.tag span::before{content:"";position:absolute;left:0;top:50%;width:10px;height:1px;background:rgba(234,240,255,.55)}

.back{position:fixed;top:calc(12px + env(safe-area-inset-top));left:calc(12px + env(safe-area-inset-left));width:40px;height:40px;border-radius:50%;display:grid;place-items:center;color:var(--ink);background:var(--glass);border:1px solid var(--line);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);z-index:3}
.back:hover{background:rgba(234,240,255,.16)}
.scalebar{position:fixed;top:calc(22px + env(safe-area-inset-top));right:calc(16px + env(safe-area-inset-right));display:grid;justify-items:end;gap:5px;pointer-events:none}
.scalebar i{display:block;height:5px;border:1px solid rgba(234,240,255,.8);border-top:0;width:80px}
.scalebar b{font-family:var(--mono);font-weight:400;font-size:12px;color:var(--ink2);font-variant-numeric:tabular-nums;text-shadow:0 1px 3px rgba(3,5,12,.9)}
.hint{position:fixed;top:calc(20px + env(safe-area-inset-top));left:0;right:0;margin:0;text-align:center;font-size:13px;color:var(--ink2);pointer-events:none;text-shadow:0 1px 3px rgba(3,5,12,.9);transition:opacity .6s}
.hint.gone{opacity:0}

.panel{position:fixed;left:0;right:0;bottom:0;z-index:2;display:grid;gap:10px;padding:14px max(16px,env(safe-area-inset-left)) calc(12px + env(safe-area-inset-bottom)) max(16px,env(safe-area-inset-right));background:var(--glass);backdrop-filter:blur(18px) saturate(1.2);-webkit-backdrop-filter:blur(18px) saturate(1.2);border-top:1px solid var(--line);border-radius:20px 20px 0 0;max-height:62%;overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin}
.title{display:none}
.title h1{font-family:var(--display);font-weight:600;font-size:30px;letter-spacing:-.025em;line-height:1;margin:0}
.title span{font-size:14px;color:var(--ink3)}
.cap{display:grid;gap:3px;transition:opacity .2s}
.cap.swap{opacity:0}
.eyebrow{font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink3)}
.cap h2{font-family:var(--display);font-weight:600;font-size:19px;letter-spacing:-.015em;line-height:1.15;margin:0;text-wrap:balance}
.cap p{margin:0;font-size:14px;line-height:1.4;color:var(--ink2);max-width:60ch;min-height:4.2em}

.transport{display:grid;grid-template-columns:46px 1fr;gap:12px;align-items:center}
.play{width:46px;height:46px;border-radius:50%;border:1px solid var(--line);background:rgba(234,240,255,.09);color:var(--ink);display:grid;place-items:center;cursor:pointer;padding:0}
.play:hover{background:rgba(234,240,255,.18)}
.play .i-pause{display:none}.play[aria-pressed="true"] .i-play{display:none}.play[aria-pressed="true"] .i-pause{display:block}
.prog{display:grid;gap:2px;min-width:0}
label{display:flex;justify-content:space-between;align-items:baseline;gap:8px;font-size:13.5px;color:var(--ink2)}
label b{font-family:var(--mono);font-weight:500;font-size:12.5px;color:var(--ink);font-variant-numeric:tabular-nums}

input[type=range]{--v:0%;-webkit-appearance:none;appearance:none;width:100%;height:28px;margin:0;background:transparent;cursor:pointer;touch-action:pan-y}
input[type=range]::-webkit-slider-runnable-track{height:4px;border-radius:2px;background:linear-gradient(90deg,rgba(234,240,255,.62) var(--v),rgba(234,240,255,.17) var(--v))}
input[type=range]::-moz-range-track{height:4px;border-radius:2px;background:rgba(234,240,255,.17)}
input[type=range]::-moz-range-progress{height:4px;border-radius:2px;background:rgba(234,240,255,.62)}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:18px;height:18px;margin-top:-7px;border-radius:50%;background:var(--ink);border:0;box-shadow:0 0 0 3px rgba(5,7,15,.9),0 2px 8px rgba(0,0,0,.6)}
input[type=range]::-moz-range-thumb{width:18px;height:18px;border-radius:50%;background:var(--ink);border:0;box-shadow:0 0 0 3px rgba(5,7,15,.9)}
input.big{height:32px}
input.big::-webkit-slider-runnable-track{height:6px;border-radius:3px;background:linear-gradient(90deg,var(--vesicle),var(--plasma)) 0 0/100% 100% no-repeat;-webkit-mask:linear-gradient(90deg,#000 var(--v),rgba(0,0,0,.26) var(--v));mask:linear-gradient(90deg,#000 var(--v),rgba(0,0,0,.26) var(--v))}
input.big::-moz-range-track{height:6px;border-radius:3px;background:rgba(234,240,255,.17)}
input.big::-moz-range-progress{height:6px;border-radius:3px;background:linear-gradient(90deg,var(--vesicle),var(--plasma))}
input.big::-webkit-slider-thumb{width:22px;height:22px;margin-top:-8px}
input.big::-moz-range-thumb{width:22px;height:22px}
.ticks{position:relative;height:9px;margin:0 11px}
.ticks i{position:absolute;top:0;width:1px;height:6px;background:rgba(234,240,255,.4)}
.ticks i.on{background:var(--ink);height:9px}

.moreBtn{display:flex;justify-content:space-between;align-items:center;width:100%;padding:9px 12px;border-radius:10px;border:1px solid var(--line);background:rgba(234,240,255,.05);color:var(--ink2);font:inherit;font-size:13.5px;cursor:pointer}
.moreBtn svg{transition:transform .2s}
.moreBtn[aria-expanded="true"] svg{transform:rotate(180deg)}
.more{display:none;gap:12px}
.panel.open .more{display:grid}
.ctl{display:grid;gap:0}
.ctl small{font-size:12.5px;color:var(--ink3);min-height:1.3em}
.group{display:grid;gap:6px;padding-top:10px;border-top:1px solid var(--line)}
.toggles{display:flex;gap:22px;flex-wrap:wrap}
.toggle{justify-content:flex-start;gap:9px;align-items:center;cursor:pointer}
.toggle input{width:18px;height:18px;margin:0;accent-color:#9FB4FF}
.key{list-style:none;margin:0;padding:10px 0 0;border-top:1px solid var(--line);display:grid;grid-template-columns:1fr 1fr;gap:5px 12px;font-size:13px;color:var(--ink2)}
.key li{display:flex;align-items:center;gap:8px;min-width:0}
.key i{width:11px;height:11px;border-radius:50%;background:var(--c);box-shadow:inset -2px -2px 3px rgba(0,0,0,.35);flex:none}
.note{margin:0;font-size:12.5px;line-height:1.45;color:var(--ink3)}

.fail{position:fixed;inset:0;display:grid;place-content:center;gap:8px;padding:24px;text-align:center;background:var(--bg);z-index:5}
.fail h2{font-family:var(--display);margin:0}.fail p{margin:0;color:var(--ink2);max-width:40ch}

/* Hover cards on labels (pointer devices on wide screens only) */
.pop{display:none;position:absolute;left:14px;top:100%;width:270px;padding:11px 13px 12px;white-space:normal;text-shadow:none;font-weight:400;font-style:normal;font-size:13.5px;line-height:1.42;color:var(--ink2);background:rgba(7,11,24,.94);border:1px solid var(--line);border-radius:12px;box-shadow:0 10px 30px rgba(0,0,0,.5)}
.pop b{display:block;font-family:var(--display);font-weight:600;font-size:15.5px;color:var(--ink);margin-bottom:3px}
.pop p{margin:0 0 7px}
.pop a{color:var(--focus);font-weight:600;text-underline-offset:2px}
.tag.up .pop{top:auto;bottom:100%}
@media (hover:hover) and (min-width:900px){
  .tag.on{pointer-events:auto;cursor:help}
  .tag:hover{z-index:6;opacity:1}
  .tag:hover .pop{display:block}
}
.share{padding:9px 12px;border-radius:10px;border:1px solid var(--line);background:rgba(234,240,255,.05);color:var(--ink2);font:inherit;font-size:13.5px;cursor:pointer;text-align:center}
.share:hover{background:rgba(234,240,255,.12);color:var(--ink)}
.key li[data-cat]{cursor:pointer;border-radius:6px;padding:1px 4px;margin:-1px -4px}
.key li[data-cat]:hover,.key li[aria-pressed="true"]{color:var(--ink);background:rgba(234,240,255,.09)}
.key li[aria-pressed="true"] i{box-shadow:0 0 0 2px var(--ink)}

/* In vivo / in vitro switch */
.mode{display:grid;grid-template-columns:1fr 1fr 1fr;gap:4px;padding:4px;border-radius:13px;background:rgba(234,240,255,.06);border:1px solid var(--line)}
.mode button{display:grid;gap:1px;padding:7px 8px;border-radius:9px;border:0;background:transparent;color:var(--ink2);font:inherit;font-family:var(--display);font-weight:600;font-size:15px;letter-spacing:-.01em;cursor:pointer}
.mode small{font-family:var(--body);font-weight:400;font-size:11.5px;letter-spacing:0;color:var(--ink3)}
.mode button[aria-pressed="true"]{background:rgba(234,240,255,.16);color:var(--ink)}
.mode button[aria-pressed="true"] small{color:var(--ink2)}
input.laser::-webkit-slider-runnable-track{background:linear-gradient(90deg,#19b8ff var(--v),rgba(25,184,255,.22) var(--v))}
input.laser::-moz-range-progress{background:#19b8ff}
.key.plain{border-top:0;padding-top:0;margin-top:-7px}
.key .wide{grid-column:1/-1;font-size:12.5px;color:var(--ink3);line-height:1.4}

/* Inference view: evidence and beliefs */
.inf{position:fixed;z-index:2;right:calc(16px + env(safe-area-inset-right));top:64px;bottom:20px;width:330px;margin:0;padding:12px 14px;display:grid;gap:8px;align-content:start;overflow-y:auto;scrollbar-width:thin;background:var(--glass);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border:1px solid var(--line);border-radius:16px}
.inf header{display:flex;justify-content:space-between;align-items:baseline;gap:8px;font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink3)}
.inf header b{font-weight:500;color:var(--ink)}
.inf header span{letter-spacing:.02em;text-transform:none}
.infTop{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.infTop figure{margin:0;display:grid;gap:3px}
.infTop figure canvas{width:100%;max-width:118px;margin:0 auto;aspect-ratio:1;display:block;border-radius:6px;background:#000;image-rendering:pixelated}
.infTop figcaption{font-size:11.5px;color:var(--ink3);text-align:center}
#fan{grid-column:1/-1;width:100%;height:104px;display:block}
#strips{width:100%;height:250px;display:block}
#pair{width:100%;height:128px;display:block}
.inf p{margin:0;font-size:11.5px;line-height:1.35;color:var(--ink3)}
body.infer .scalebar{right:calc(362px + env(safe-area-inset-right))}
body.infer #sizeNote{display:none}

/* "How it works": a summary of the inference mathematics */
.mathBtn{margin-left:auto;padding:3px 9px;border-radius:999px;border:1px solid var(--line);background:rgba(234,240,255,.08);color:var(--ink);font:inherit;font-family:var(--body);font-size:12px;letter-spacing:0;text-transform:none;cursor:pointer}
.mathBtn:hover{background:rgba(234,240,255,.18)}
.inf header span{margin-left:auto}
.inf header .mathBtn{margin-left:8px}
.math{width:min(640px,calc(100% - 24px));max-height:min(86%,860px);padding:22px 24px 20px;border:1px solid var(--line);border-radius:18px;background:#0a0f20;color:var(--ink2);font-size:15px;line-height:1.5;overflow-y:auto;overscroll-behavior:contain}
.math::backdrop{background:rgba(3,5,12,.66);backdrop-filter:blur(3px)}
.math h2{font-family:var(--display);font-weight:600;font-size:24px;letter-spacing:-.02em;color:var(--ink);margin:0 36px 8px 0}
.math h3{font-family:var(--display);font-weight:600;font-size:16.5px;color:var(--ink);margin:18px 0 4px}
.math p{margin:0 0 8px;max-width:64ch}
.math .lede{color:var(--ink);font-size:16px}
.math .eq{font-family:'Fraunces','Iowan Old Style',Georgia,serif;font-size:17.5px;line-height:1.7;color:#ffcf6b;padding:8px 14px;margin:8px 0 10px;border-left:2px solid rgba(255,207,107,.45);background:rgba(255,207,107,.06);border-radius:0 8px 8px 0;overflow-x:auto;white-space:nowrap}
.math ul{margin:0 0 8px;padding-left:20px}
.math li{margin:2px 0}
.math b{color:var(--ink);font-weight:600}
.math .fine{font-size:13px;color:var(--ink3);margin-top:14px;padding-top:12px;border-top:1px solid var(--line)}
.mathClose{position:sticky;top:0;float:right;width:34px;height:34px;margin:-6px -8px 0 8px;border-radius:50%;border:1px solid var(--line);background:#141a30;color:var(--ink);font-size:20px;line-height:1;cursor:pointer}

/* The microscope's camera, picture in picture */
.pip{position:fixed;z-index:2;right:calc(16px + env(safe-area-inset-right));bottom:20px;width:232px;max-height:calc(100% - 84px);overflow-y:auto;scrollbar-width:thin;grid-auto-rows:max-content;margin:0;padding:10px;display:grid;gap:7px;background:var(--glass);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border:1px solid var(--line);border-radius:16px}
.pip figcaption{display:flex;justify-content:space-between;align-items:baseline;gap:8px;font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink3)}
.pip figcaption b{font-weight:500;color:var(--ink)}
.pip figcaption span{letter-spacing:.02em;text-transform:none;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pipImg{position:relative;aspect-ratio:1;border-radius:8px;overflow:hidden;background:#000}
#cam,#camZoom{width:100%;height:100%;display:block;image-rendering:pixelated}
.pipBox{position:absolute;border:1px solid rgba(255,255,255,.75);pointer-events:none}
.pipScale{position:absolute;left:8px;right:8px;bottom:7px;display:grid;gap:3px;justify-items:start;pointer-events:none}
.pipScale i{display:block;height:2px;background:#fff}
.pipScale em{font-family:var(--mono);font-style:normal;font-size:10px;color:#fff;text-shadow:0 0 3px #000}
#trace{width:100%;height:48px;display:block;min-width:0}
.pipTrace{display:grid;grid-template-columns:auto 1fr;gap:2px 3px;align-items:center}
.pipTrace span{font-family:var(--mono);font-size:9px;line-height:1;letter-spacing:.04em;color:var(--ink3)}
.axY{writing-mode:vertical-rl;transform:rotate(180deg);text-align:center}
.axX{grid-column:2;text-align:center}
.pip p{margin:0;font-size:11.5px;line-height:1.35;color:var(--ink3)}
.pipCount b{font-family:var(--mono);font-weight:400;color:var(--ink);font-variant-numeric:tabular-nums}

@media (max-width:899px){
  .inf{top:calc(54px + env(safe-area-inset-top));left:8px;right:8px;bottom:auto;width:auto;padding:8px 10px;gap:5px;grid-template-columns:1fr}
  .infTop{grid-template-columns:62px 62px 1fr;align-items:start}
  .infTop figcaption{font-size:10px}
  #fan{grid-column:auto;height:78px}
  #strips{height:150px}
  #pair,.inf p,.inf header span{display:none}
  .inf header .mathBtn{margin-left:auto}
  .math{padding:18px 16px;font-size:14.5px}
  .math .eq{font-size:15.5px}
  body.infer .scalebar,body.infer .hint{display:none}
  .pip{top:calc(92px + env(safe-area-inset-top));bottom:auto;width:124px;padding:7px;gap:5px;border-radius:13px}
  .pip p,.pip figcaption span{display:none}
  #trace{height:30px}
  .pipTrace span{font-size:8px}
  .scalebar{top:calc(52px + env(safe-area-inset-top))}
  .hint{top:calc(22px + env(safe-area-inset-top));padding:0 60px}
  .tag{font-size:11px}
  .tag.far{display:none}
}
@media (max-width:899px) and (max-height:520px){ .cap p{display:none} }
@media (min-width:900px){
  .panel{left:20px;top:20px;bottom:20px;right:auto;width:372px;border:1px solid var(--line);border-radius:20px;padding:22px 22px 20px;gap:16px;max-height:none;align-content:start}
  .title{display:grid;gap:5px;padding-left:48px;min-height:40px;align-content:center}
  .back{top:36px;left:36px}
  .cap{gap:6px;padding-top:14px;border-top:1px solid var(--line)}
  .cap h2{font-size:23px}
  .cap p{font-size:15px;line-height:1.45;min-height:5.8em}
  .moreBtn{display:none}
  .more{display:grid;gap:14px;padding-top:14px;border-top:1px solid var(--line)}
  .hint{left:412px;top:auto;bottom:22px}
  body.vitro .hint{right:268px}
  body.infer .hint{right:362px}
  .scalebar{top:26px;right:26px}
  .tag{font-size:13px}
}
@media (prefers-reduced-motion:reduce){.cap,.tag,.hint{transition:none}}