:root{
  --bg:#0d1218; --panel:#141c26; --panel2:#18222e; --line:rgba(255,255,255,.09);
  --ink:#e9eef4; --dim:#9fb0c0; --accent:#4aa3ff; --warm:#ff8a3d; --good:#39c07a; --bad:#e2574c;
  color-scheme:dark;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:radial-gradient(1200px 700px at 50% -10%,#16222f 0%,var(--bg) 60%) fixed;
  color:var(--ink);
  font:15px/1.55 ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
}
.skip{position:absolute;left:-9999px}
.skip:focus{left:8px;top:8px;background:#fff;color:#000;padding:8px 12px;border-radius:6px;z-index:50}
.top{display:flex;gap:18px;align-items:flex-start;justify-content:space-between;
  flex-wrap:wrap;padding:20px clamp(12px,3vw,32px) 8px;max-width:1180px;margin:0 auto}
h1{margin:0;font-size:clamp(22px,3.4vw,32px);letter-spacing:-.01em}
.tag{margin:6px 0 0;color:var(--dim);max-width:62ch}
.tag em{color:var(--ink);font-style:normal;font-weight:600}
.topbtns{display:flex;gap:8px;flex-wrap:wrap}
main{max-width:1180px;margin:0 auto;padding:0 clamp(12px,3vw,32px) 48px;
  display:flex;flex-direction:column;gap:16px}
.panel{background:linear-gradient(180deg,var(--panel2),var(--panel));
  border:1px solid var(--line);border-radius:14px;padding:16px clamp(12px,2vw,20px)}
.panel h2{margin:0 0 10px;font-size:16px;letter-spacing:.01em}
.lead{margin:0 0 12px;color:var(--dim);max-width:84ch}
canvas{display:block;width:100%;border-radius:10px;background:rgba(0,0,0,.25);
  border:1px solid var(--line);touch-action:none}
#rowCanvas{height:clamp(280px,42vh,420px);cursor:pointer}
#plotCanvas{height:clamp(220px,32vh,320px)}
button{font:inherit;color:var(--ink);background:#1e2a38;border:1px solid var(--line);
  border-radius:9px;padding:7px 13px;cursor:pointer}
button:hover{background:#26364a}
button:focus-visible,select:focus-visible,input:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
button.on{background:var(--accent);border-color:var(--accent);color:#06121e;font-weight:640}
.modebar{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-bottom:12px}
.modebar .spacer{flex:1 1 20px}
.hint{color:var(--dim);font-size:13px;margin:10px 0 0}
kbd{background:#0c141d;border:1px solid var(--line);border-bottom-width:2px;border-radius:5px;
  padding:1px 5px;font:12px ui-monospace,SFMono-Regular,Menlo,monospace}
.score{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-top:10px;
  font-size:14px;color:var(--dim)}
.score strong{color:var(--ink)}
.score .sep{opacity:.4}
.score.solved strong{color:var(--good)}
.badge{background:var(--good);color:#04160d;border-radius:999px;padding:2px 10px;font-weight:650;font-size:12px}
.tuner-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px}
.tuner-cell{background:rgba(0,0,0,.22);border:1px solid var(--line);border-radius:10px;padding:9px 11px;
  display:flex;flex-direction:column;gap:3px}
.tuner-label{font-size:11px;text-transform:uppercase;letter-spacing:.07em;color:var(--dim)}
.tuner-value{font:600 16px/1.2 ui-monospace,SFMono-Regular,Menlo,monospace}
.tuner-cell.good .tuner-value{color:var(--good)}
.tuner-cell.bad .tuner-value{color:var(--bad)}
.note{color:var(--dim);font-size:13px;margin:10px 0 0;max-width:88ch}
.note.warn{color:#ffcf8a}
.muted{color:var(--dim)}
.fill-row{display:grid;grid-template-columns:130px 1fr 150px;gap:10px;align-items:center;
  padding:3px 0;border-bottom:1px solid rgba(255,255,255,.04)}
.fill-label{font-size:13px;color:var(--dim)}
.fill-range{width:100%}
.fill-out{font:12px ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--dim);text-align:right}
.fill-out.good{color:var(--good)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(215px,1fr));gap:12px}
.grid label{display:flex;flex-direction:column;gap:5px;font-size:12px;
  text-transform:uppercase;letter-spacing:.06em;color:var(--dim)}
select,input[type=number]{font:inherit;text-transform:none;letter-spacing:normal;
  color:var(--ink);background:#0f1822;border:1px solid var(--line);border-radius:8px;padding:7px 9px}
.check,.check2{display:flex;gap:9px;align-items:flex-start;color:var(--dim);
  font-size:13px;text-transform:none;letter-spacing:normal;margin-top:10px;max-width:84ch}
.grid .check2{grid-column:1/-1;flex-direction:row;align-items:flex-start;margin-top:0}
table{border-collapse:collapse;width:100%;font-size:13px}
th,td{text-align:left;padding:7px 10px;border-bottom:1px solid var(--line);vertical-align:top}
th{color:var(--dim);font-weight:600;font-size:11px;text-transform:uppercase;letter-spacing:.07em}
.phys td.k{color:var(--dim);width:24%}
.phys td.v{font:600 13px/1.4 ui-monospace,SFMono-Regular,Menlo,monospace;width:20%}
.phys td.w{color:var(--dim)}
.find td:first-child{color:var(--ink)}
.find td{font:13px/1.5 ui-monospace,SFMono-Regular,Menlo,monospace}
.find td:first-child,.find td:last-child{font-family:inherit}
.finding{margin:0 0 22px}
.finding h3{margin:0 0 6px;font-size:14px;letter-spacing:.01em}
.wrap-scroll,.panel table{display:block;overflow-x:auto}
#helpPanel h3{margin:18px 0 6px;font-size:14px}
#helpPanel p,#helpPanel li{color:var(--dim);max-width:86ch}
#helpPanel li{margin-bottom:6px}
.foot{max-width:1180px;margin:0 auto;padding:0 clamp(12px,3vw,32px) 40px;color:var(--dim);font-size:13px}
.foot a{color:var(--accent)}
[hidden]{display:none !important}
@media (max-width:640px){
  .fill-row{grid-template-columns:72px 1fr 88px}
  #rowCanvas{height:clamp(210px,32vh,300px)}
  .phys td.k,.phys td.v{width:auto}
}
@media (prefers-reduced-motion:reduce){*{animation:none !important;transition:none !important}}