/* Layout: a workbench. Topic rail | the 3D stage | the numbers. One dark shop-light look, same palette as the printed field guide. */
:root{
  --bg:#1c1915; --panel:#24201a; --line:#3d362c; --ink:#ece4d3; --muted:#a79d89;
  --gold:#d3a74c; --green:#9fbb6c; --blue:#86abc9; --red:#d26b4d;
  --serif:'EB Garamond',Georgia,'Times New Roman',serif;
  --sans:Inter,system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  color-scheme:dark;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{height:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--serif);font-size:15px;
  padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
button,select,input{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--gold);outline-offset:2px}
.app{display:grid;grid-template-columns:240px minmax(0,1fr) 340px;grid-template-rows:auto minmax(0,1fr);gap:0 18px;height:100%;padding-block:12px}
header{grid-column:1/-1;display:flex;align-items:center;gap:14px;padding-bottom:10px;border-bottom:1px solid var(--line);margin-bottom:12px;min-width:0}
.brand{display:flex;flex-direction:column;min-width:0}
.kick{font:600 9.5px/1.2 var(--sans);letter-spacing:.16em;text-transform:uppercase;color:var(--gold)}
h1{margin:2px 0 0;font-weight:600;font-size:24px;line-height:1.05;text-wrap:balance}
.nav{margin-left:auto;display:flex;align-items:center;gap:8px}
.count{font:500 12px var(--sans);color:var(--muted);font-variant-numeric:tabular-nums;min-width:52px;text-align:center}
.btn{background:var(--panel);border:1px solid var(--line);border-radius:6px;min-height:36px;min-width:36px;padding:0 10px;cursor:pointer;font:600 12px var(--sans);display:inline-flex;align-items:center;justify-content:center;gap:6px}
.btn:hover{border-color:var(--gold)}
.btn[aria-pressed="true"]{border-color:var(--gold);color:var(--gold)}
#pick{display:none;background:var(--panel);border:1px solid var(--line);border-radius:6px;min-height:36px;padding:0 8px;max-width:100%;font:500 13px var(--sans)}
/* rail */
.rail{overflow:auto;min-height:0;padding-right:4px}
.rail h3{font:600 9px/1 var(--sans);letter-spacing:.15em;text-transform:uppercase;color:var(--gold);margin:14px 0 6px}
.rail h3:first-child{margin-top:2px}
.rail ol{list-style:none;margin:0;padding:0}
.rail a{display:flex;gap:8px;align-items:baseline;padding:5px 6px;border-radius:5px;color:var(--ink);text-decoration:none;font-size:14px;line-height:1.2}
.rail a span{font:600 10.5px var(--sans);color:var(--gold);min-width:18px;text-align:right;font-variant-numeric:tabular-nums}
.rail a:hover{background:var(--panel)}
.rail a[aria-current="true"]{background:var(--panel);box-shadow:inset 2px 0 0 var(--gold)}
/* stage */
.stagewrap{display:flex;flex-direction:column;min-height:0;min-width:0}
.stage{position:relative;flex:1;min-height:0;border-radius:8px;overflow:hidden;border:1px solid var(--line);
  background:radial-gradient(120% 90% at 50% 35%,#2c2720 0%,#1d1a16 55%,#141210 100%);touch-action:none}
.stage canvas.gl{position:absolute;inset:0;width:100%;height:100%;display:block}
.labels{position:absolute;inset:0;pointer-events:none;overflow:hidden}
.lbl{position:absolute;left:0;top:0;white-space:nowrap;font:600 11px/1.15 var(--sans);color:var(--c,var(--ink));
  background:rgba(20,18,15,.78);border:1px solid color-mix(in srgb,var(--c,var(--ink)) 45%,transparent);border-radius:4px;padding:2px 5px;font-variant-numeric:tabular-nums}
.lbl.big{font-size:13px;padding:3px 7px}
.lbl.plain{background:none;border:none;text-shadow:0 1px 3px #000,0 0 6px #000}
.hud{position:absolute;left:12px;top:10px;font:600 10px/1.3 var(--sans);letter-spacing:.12em;text-transform:uppercase;color:var(--gold);
  background:rgba(20,18,15,.72);padding:5px 8px;border-radius:4px;max-width:calc(100% - 24px)}
.hud:empty{display:none}
.stagenote{position:absolute;inset:auto 12px 10px auto;font:500 10px var(--sans);color:var(--muted);background:rgba(20,18,15,.6);padding:3px 6px;border-radius:4px}
.nogl{position:absolute;inset:0;display:grid;place-items:center;text-align:center;padding:24px;color:var(--muted);font-size:15px}
.timeline{display:flex;align-items:center;gap:10px;padding-top:10px}
.timeline input{flex:1;accent-color:var(--gold);min-width:0}
/* panel */
.panel{overflow:auto;min-height:0;display:flex;flex-direction:column;gap:12px;padding-bottom:12px}
.chip{align-self:flex-start;font:600 10px var(--sans);letter-spacing:.12em;text-transform:uppercase;color:var(--bg);background:var(--gold);border-radius:3px;padding:3px 6px}
.panel h2{margin:0;font-size:26px;line-height:1.05;font-weight:600;text-wrap:balance}
.cap{margin:0;color:var(--ink);line-height:1.38;font-size:15.5px}
.plainbox{background:var(--panel);border-left:3px solid var(--green);border-radius:0 6px 6px 0;padding:8px 11px}
.plainbox summary{cursor:pointer;list-style:none;display:flex;align-items:center;gap:6px;font:600 9.5px var(--sans);letter-spacing:.14em;text-transform:uppercase;color:var(--green);min-height:20px}
.plainbox summary::-webkit-details-marker{display:none}
.plainbox summary::after{content:"▾";font-size:11px;letter-spacing:0;transition:transform .15s}
.plainbox:not([open]) summary::after{transform:rotate(-90deg)}
.plain{margin:4px 0 0;line-height:1.42;font-size:14.5px;color:var(--ink)}
.formula{font:600 13px/1.4 var(--sans);color:var(--gold);background:var(--panel);border:1px solid var(--line);border-radius:6px;padding:8px 10px}
.readout{width:100%;border-collapse:collapse}
.readout th{font:600 9px var(--sans);letter-spacing:.12em;text-transform:uppercase;color:var(--muted);text-align:left;border-bottom:1.5px solid var(--gold);padding:4px 0}
.readout td{padding:5px 0;border-bottom:1px solid var(--line);font-size:14.5px;vertical-align:baseline}
.readout td+td{text-align:right;font:500 13px var(--sans);font-variant-numeric:tabular-nums;padding-left:10px}
.readout tr.good td+td{color:var(--green)} .readout tr.bad td+td{color:var(--red)} .readout tr.key td+td{color:var(--gold)}
.ctl{display:grid;gap:4px}
.ctl label{display:flex;justify-content:space-between;font:600 11px var(--sans);color:var(--muted)}
.ctl label b{color:var(--ink);font-weight:600;font-variant-numeric:tabular-nums}
.ctl input{accent-color:var(--gold);width:100%;min-height:28px}
.legend{display:flex;flex-wrap:wrap;gap:6px 12px;font:500 11px var(--sans);color:var(--muted)}
.legend i{display:inline-block;width:10px;height:3px;border-radius:2px;margin-right:5px;vertical-align:middle;background:var(--c)}
.foot{font:500 11px/1.45 var(--sans);color:var(--muted);border-top:1px solid var(--line);padding-top:8px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
@media (max-width:1100px){.app{grid-template-columns:200px minmax(0,1fr) 300px}}
@media (max-width:600px){.lbl{font-size:9.5px;padding:1px 4px}.lbl.big{font-size:10.5px}.hud{font-size:9px}}
@media (max-width:900px){
  html,body{height:auto}
  .app{display:flex;flex-direction:column;height:auto;gap:12px}
  header{margin-bottom:0;flex-wrap:wrap}
  .rail{display:none}
  #pick{display:block;flex:1;min-width:0}
  .nav{margin-left:0;width:100%}
  .stage{flex:none;aspect-ratio:4/3.2;max-height:68svh}
  .panel{overflow:visible}
}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto}}
@media (hover:none),(max-width:900px){.stagenote .keys{display:none}}