:root{
  --bg:#F4F2EC; --ink:#151412; --mute:#6B6963; --line:rgba(21,20,18,.14); --line2:rgba(21,20,18,.28);
  --panel:rgba(244,242,236,.86); --chip:rgba(21,20,18,.05); --scheme:light;
  --acc:var(--model-acc,#E4606A);
  --ease:cubic-bezier(.2,.7,.1,1);
  --mono:"IBM Plex Mono",ui-monospace,monospace; --serif:"Instrument Serif",serif;
  --sans:"Zen Kaku Gothic New","Hiragino Sans","Yu Gothic",sans-serif;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#0B0C0E; --ink:#ECEAE3; --mute:#8D8B85; --line:rgba(236,234,227,.12); --line2:rgba(236,234,227,.26);
    --panel:rgba(11,12,14,.82); --chip:rgba(236,234,227,.06); --scheme:dark; color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#0B0C0E; --ink:#ECEAE3; --mute:#8D8B85; --line:rgba(236,234,227,.12); --line2:rgba(236,234,227,.26);
  --panel:rgba(11,12,14,.82); --chip:rgba(236,234,227,.06); --scheme:dark; color-scheme:dark;
}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased;
  padding:max(16px,env(safe-area-inset-top)) max(16px,env(safe-area-inset-right)) max(16px,env(safe-area-inset-bottom)) max(16px,env(safe-area-inset-left));
  min-height:100vh;transition:background .4s var(--ease),color .4s var(--ease)}
button{font:inherit;color:inherit}
.fig{display:grid;grid-template-rows:auto minmax(420px,1fr) auto auto;gap:14px;min-height:calc(100vh - 32px);max-width:1680px;margin:0 auto}
.eyebrow{font:500 11px/1.4 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--mute)}
.top{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;flex-wrap:wrap;border-bottom:1px solid var(--line2);padding-bottom:12px}
.top h1{margin:4px 0 0;font:400 clamp(30px,4.4vw,56px)/1 var(--serif);letter-spacing:-.01em}
.top h1 small{display:block;margin-top:8px;font:400 13px/1.5 var(--sans);letter-spacing:.02em;color:var(--mute)}
.top .meta{display:flex;gap:18px;align-items:flex-end;flex-wrap:wrap}
.spec{display:grid;grid-template-columns:auto auto;gap:2px 12px;font:400 11px/1.5 var(--mono);color:var(--mute)}
.spec b{font-weight:500;color:var(--ink);font-family:var(--sans);font-size:12px}
.iconbtn{appearance:none;border:1px solid var(--line2);background:transparent;border-radius:999px;height:34px;min-width:34px;padding:0 12px;
  display:inline-flex;align-items:center;gap:8px;cursor:pointer;font:500 11px/1 var(--mono);letter-spacing:.08em;text-transform:uppercase}
.iconbtn:hover{border-color:var(--ink)}
.iconbtn:focus-visible,.tool:focus-visible,.tab:focus-visible{outline:2px solid var(--acc);outline-offset:2px}

.stage{position:relative;border:1px solid var(--line2);overflow:hidden;touch-action:none;user-select:none;-webkit-user-select:none;min-height:420px;
  background:
    linear-gradient(var(--line) 1px,transparent 1px) 0 0/40px 40px,
    linear-gradient(90deg,var(--line) 1px,transparent 1px) 0 0/40px 40px;
  background-position:-1px -1px}
.stage::before{content:"";position:absolute;inset:0;background:radial-gradient(ellipse at 50% 55%,transparent 30%,var(--bg) 92%);pointer-events:none}
.stage canvas{position:absolute;inset:0;width:100%;height:100%;display:block;cursor:grab;outline:none}
.stage canvas.is-key{cursor:pointer}
.stage canvas:active{cursor:grabbing}
.ticks{position:absolute;inset:0;pointer-events:none}
.ticks i{position:absolute;width:14px;height:14px;border-color:var(--ink);border-style:solid;opacity:.7}
.ticks i:nth-child(1){left:10px;top:10px;border-width:1px 0 0 1px}
.ticks i:nth-child(2){right:10px;top:10px;border-width:1px 1px 0 0}
.ticks i:nth-child(3){left:10px;bottom:10px;border-width:0 0 1px 1px}
.ticks i:nth-child(4){right:10px;bottom:10px;border-width:0 1px 1px 0}
.figno{position:absolute;left:22px;top:18px;font:400 22px/1 var(--serif);pointer-events:none}
.figno span{display:block;margin-top:6px;font:500 10px/1.4 var(--mono);letter-spacing:.14em;color:var(--mute);text-transform:uppercase}
.hint{position:absolute;left:22px;bottom:18px;font:400 12px/1.7 var(--sans);color:var(--mute);pointer-events:none;max-width:40%;margin:0}
.hint kbd{font:500 10px/1 var(--mono);border:1px solid var(--line2);border-radius:4px;padding:2px 5px;color:var(--ink)}
.readout{position:absolute;right:22px;bottom:18px;margin:0;display:grid;grid-template-columns:repeat(4,auto minmax(0,auto));gap:3px 10px;font:400 11px/1.5 var(--mono);
  pointer-events:none;text-align:left;background:var(--panel);padding:8px 12px;border:1px solid var(--line);backdrop-filter:blur(6px)}
.readout dt{color:var(--mute);letter-spacing:.1em}
.readout dd{margin:0 8px 0 0;min-width:4ch;font-variant-numeric:tabular-nums;white-space:nowrap}
.readout #rView{min-width:10ch}
.readout .typed{grid-column:1/-1;border-top:1px solid var(--line);padding-top:5px;margin-top:2px;text-align:left;min-height:1.5em;white-space:pre;overflow:hidden;max-width:none}
.readout .typed::after{content:"▍";color:var(--acc);animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.scale{position:absolute;right:22px;top:20px;font:500 10px/1 var(--mono);color:var(--mute);pointer-events:none;text-align:right}
.scale b{display:block;height:6px;margin-top:6px;border:1px solid var(--ink);border-top:0;margin-left:auto}
.callouts{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;overflow:visible}
.callouts line{stroke:var(--ink);stroke-width:1}
.callouts circle{fill:var(--bg);stroke:var(--ink)}
.callouts .num{font:600 10px var(--mono);fill:var(--acc);paint-order:stroke;stroke:var(--bg);stroke-width:3px}
.tags{position:absolute;inset:0;pointer-events:none}
.tag{position:absolute;transform:translate(0,-50%);font:400 12px/1.3 var(--sans);white-space:nowrap;padding:3px 0;opacity:0;transition:opacity .4s var(--ease)}
.tag em{font:500 10px/1 var(--mono);font-style:normal;color:var(--acc);margin-right:6px}
.tag.on{opacity:1}
.tag small{font-size:inherit}
.splitline{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;overflow:visible}
.splitline line{stroke:var(--acc);stroke-width:1.5;stroke-dasharray:6 5}
.handle{position:absolute;width:36px;height:36px;margin:-18px 0 0 -18px;border-radius:50%;border:1.5px solid var(--acc);background:var(--panel);
  display:none;place-items:center;cursor:ew-resize;touch-action:none;font:600 12px/1 var(--mono);color:var(--acc)}
.handle.on{display:grid}
.side-tag{position:absolute;top:56px;font:500 11px/1 var(--mono);letter-spacing:.1em;text-transform:uppercase;padding:6px 8px;border:1px solid var(--line2);background:var(--panel);pointer-events:none;display:none}
.side-tag.on{display:block}
.side-tag i{display:inline-block;width:14px;height:2px;vertical-align:middle;margin-right:8px;background:currentColor}

.toolbar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;justify-content:space-between}
.tools{display:flex;flex-wrap:wrap;gap:6px}
.tool,.tab{appearance:none;border:1px solid var(--line2);background:transparent;height:40px;padding:0 14px;border-radius:999px;cursor:pointer;
  font:500 13px/1 var(--sans);display:inline-flex;align-items:center;gap:8px;transition:background .25s var(--ease),color .25s var(--ease),border-color .25s}
.tool:hover,.tab:hover{border-color:var(--ink)}
.tool[aria-pressed="true"],.tab[aria-selected="true"]{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.tool .k{font:500 10px/1 var(--mono);opacity:.6}
.tabs{display:flex;gap:6px;flex-wrap:wrap}
.legend{display:flex;flex-wrap:wrap;gap:10px 26px;align-items:center;border-top:1px solid var(--line2);padding-top:12px;font:400 12px/1.5 var(--sans);color:var(--mute)}
.legend .sw{display:inline-block;width:12px;height:12px;border-radius:3px;border:1px solid var(--line2);vertical-align:-2px;margin-right:7px}
.legend .ln{display:inline-block;width:22px;height:0;border-top:1px solid var(--ink);vertical-align:middle;margin-right:7px}
.legend .ln.weak{opacity:.45}
.legend .note{margin-left:auto;font:400 11px/1.5 var(--mono);letter-spacing:.04em}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.loading{position:absolute;inset:0;display:grid;place-items:center;font:500 11px/1 var(--mono);letter-spacing:.14em;color:var(--mute);transition:opacity .6s}
.loading.done{opacity:0;pointer-events:none}
@media (max-width:720px){
  .fig{grid-template-rows:auto minmax(360px,58vh) auto auto;gap:12px}
  .hint{display:none}
  .readout{right:10px;bottom:10px;left:10px;grid-template-columns:auto 1fr auto 1fr;text-align:left;font-size:10px}
  .readout .typed{max-width:none}
  .figno{left:14px;top:14px}
  .scale{right:14px;top:16px}
  .tool,.tab{height:38px;padding:0 12px;font-size:12px}
  .tool .k{display:none}
  .legend .note{margin-left:0}
  .tag{font-size:11px;padding:0}
  .tag small{display:none}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important}
}

.back{display:inline-block;margin-bottom:10px;font:500 12px/1 var(--mono,monospace);letter-spacing:.08em;color:inherit;opacity:.7;text-decoration:none;border-bottom:1px solid currentColor;padding-bottom:3px}
.back:hover,.back:focus-visible{opacity:1}