:root { --bg:#060a07; --field:#0a100c; --line:#294032; --muted:#a7b5aa; --text:#ecf3eb; --acid:#a6ff1a; --amber:#f4b758; --ghost:#71947a; }
* { box-sizing:border-box; }
html { background:var(--bg); }
body { margin:0; background:var(--bg); color:var(--text); font-family:"Instrument Sans", ui-sans-serif, system-ui, sans-serif; }
button,input { font:inherit; }
.instrument { max-width:920px; margin:0 auto; padding:clamp(18px,4vw,38px); }
.instrument-header { display:flex; align-items:end; justify-content:space-between; gap:20px; padding-bottom:18px; border-bottom:1px solid var(--line); }
.eyebrow,.strip-heading p,.status,.displacement-control span,.method-note { font-family:"IBM Plex Mono", ui-monospace, monospace; letter-spacing:.06em; text-transform:uppercase; }
.eyebrow { margin:0 0 8px; color:var(--acid); font-size:10px; }
h1 { margin:0; font-size:clamp(31px,5vw,52px); line-height:.92; letter-spacing:-.06em; }
.status { display:flex; align-items:center; gap:8px; margin:0; color:var(--muted); font-size:10px; white-space:nowrap; }
.status span { width:7px; height:7px; background:var(--acid); }
.status strong { color:var(--text); font-weight:500; }
.field { position:relative; margin-top:22px; border:1px solid var(--line); background:var(--field); }
#constellation { display:block; width:100%; height:auto; min-height:300px; }
.grid-line { stroke:#17251b; stroke-width:1; vector-effect:non-scaling-stroke; }
.axis-line { stroke:#5f7765; stroke-width:1; vector-effect:non-scaling-stroke; }
.axis-tick { stroke:#5f7765; stroke-width:1; vector-effect:non-scaling-stroke; }
.axis-text { fill:var(--muted); font:14px "IBM Plex Mono", ui-monospace, monospace; letter-spacing:1px; }
.quadrant-label { fill:#69836f; font:14px "IBM Plex Mono", ui-monospace, monospace; }
.ideal-point { fill:var(--acid); stroke:var(--field); stroke-width:3; vector-effect:non-scaling-stroke; }
.perturbed-point { fill:var(--amber); fill-opacity:.78; }
.perturbed-link { stroke:var(--amber); stroke-opacity:.28; stroke-width:1; vector-effect:non-scaling-stroke; }
.legend { display:flex; flex-wrap:wrap; gap:16px; padding:10px 13px; border-top:1px solid var(--line); color:var(--muted); font:10px/1.4 "IBM Plex Mono", ui-monospace, monospace; text-transform:uppercase; letter-spacing:.06em; }
.legend span { display:flex; align-items:center; gap:7px; }
.legend i { width:9px; height:9px; display:inline-block; }
.ideal-key { background:var(--acid); }.perturbed-key { background:var(--amber); }
.controls { display:grid; grid-template-columns:minmax(220px,1fr) auto; gap:20px 28px; align-items:end; margin-top:20px; padding:19px 0 20px; border-top:1px solid var(--line); border-bottom:1px solid var(--line); }
.displacement-control { display:grid; gap:12px; color:var(--text); font-size:12px; }
.displacement-control span { display:flex; justify-content:space-between; color:var(--muted); font-size:10px; }
output { color:var(--acid); }
input[type="range"] { width:100%; accent-color:var(--acid); cursor:pointer; }
.actions { display:flex; flex-wrap:wrap; gap:8px; }
button { min-height:37px; padding:9px 12px; border:1px solid var(--acid); border-radius:0; background:var(--acid); color:#0c1606; cursor:pointer; font:600 10px/1.2 "IBM Plex Mono", ui-monospace, monospace; letter-spacing:.05em; text-transform:uppercase; }
button.quiet { border-color:var(--line); background:transparent; color:var(--text); }
button:hover { border-color:var(--text); }.quiet:hover { color:var(--acid); border-color:var(--acid); }
button:focus-visible,input:focus-visible { outline:2px solid var(--text); outline-offset:3px; }
.visibility { grid-column:1 / -1; display:flex; flex-wrap:wrap; gap:18px; color:var(--muted); font:10px/1.3 "IBM Plex Mono", ui-monospace, monospace; text-transform:uppercase; letter-spacing:.04em; }
.visibility label { display:flex; align-items:center; gap:8px; cursor:pointer; }.visibility input { accent-color:var(--acid); }
.symbol-strip { margin-top:20px; }
.strip-heading { display:flex; justify-content:space-between; gap:16px; align-items:baseline; }
h2 { margin:0; font-size:15px; font-weight:600; }.strip-heading p { margin:0; color:var(--muted); font-size:9px; }
#pair-list { display:grid; grid-template-columns:repeat(10,minmax(0,1fr)); gap:1px; margin:12px 0 0; padding:1px; background:var(--line); list-style:none; }
#pair-list li { min-width:0; padding:11px 4px; background:var(--field); color:var(--text); text-align:center; font:500 12px/1 "IBM Plex Mono", ui-monospace, monospace; }
.method-note { max-width:720px; margin:18px 0 0; color:var(--ghost); font-size:9px; line-height:1.65; }
@media (min-width:621px) {
  .instrument { padding:18px 28px; }
  .instrument-header { padding-bottom:12px; }
  .field { margin-top:14px; }
  #constellation { max-width:450px; margin-inline:auto; }
  .axis-text,.quadrant-label { font-size:18px; }
  .controls { gap:12px 28px; margin-top:12px; padding:10px 0; }
  .symbol-strip { margin-top:12px; }
  #pair-list { margin-top:8px; }
  #pair-list li { padding:8px 4px; }
  .method-note { margin-top:10px; }
}
@media (max-width:620px) { .instrument { padding:18px; }.instrument-header { align-items:start; flex-direction:column; }.controls { grid-template-columns:1fr; }.actions button { flex:1; min-height:44px; }.visibility { gap:12px; }.visibility label { min-height:44px; }.strip-heading { align-items:start; flex-direction:column; gap:6px; } #pair-list { grid-template-columns:repeat(5,minmax(0,1fr)); } input[type="range"] { min-height:44px; } }
@media (prefers-reduced-motion:reduce) { * { scroll-behavior:auto; } }