:root{
  --bg:#f3f3f3; --surface:#ffffff; --surface2:#f9f9f9; --ink:#1b1b1b; --muted:#5d5d5d; --line:#e0e0e0; --line-strong:#8a8a8a;
  --accent:#0067c0; --accent-ink:#ffffff;
  --act:#0f7b0f; --grad:#c25400; --focus:#0067c0;
  --l1:#0067c0; --l2:#c42b1c; --l3:#0f7b0f; --l4:#7a3e9d;
  --k0:#0067c0; --k1:#d97706;
  --ui:'Segoe UI Variable','Segoe UI',system-ui,-apple-system,Roboto,Arial,sans-serif;
  --num:Consolas,'Cascadia Mono',ui-monospace,Menlo,monospace;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root{
    --bg:#202020; --surface:#2b2b2b; --surface2:#323232; --ink:#ffffff; --muted:#c5c5c5; --line:#3d3d3d; --line-strong:#8a8a8a;
    --accent:#60cdff; --accent-ink:#000000;
    --act:#6ccb5f; --grad:#fc9b5b; --focus:#60cdff;
    --l1:#60cdff; --l2:#ff99a4; --l3:#6ccb5f; --l4:#c9a0e6;
    --k0:#60cdff; --k1:#fcb345;
    color-scheme:dark;
  }
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--ui);font-size:14px;line-height:1.5}
.wrap{max-width:1040px;margin:0 auto;padding:0 20px 40px}
h1,h2,h3{font-weight:600;margin:0;line-height:1.25}
h1{font-size:28px}
h2{font-size:20px;margin:36px 0 8px}
h3{font-size:14px}
p{margin:0 0 12px}
.prose{max-width:720px}
a{color:var(--accent)}
.num,.m{font-family:var(--num);font-size:13px}
.m{font-style:normal}
:focus-visible{outline:2px solid var(--focus);outline-offset:2px}

header{padding:28px 0 4px}
.lede{color:var(--muted);font-size:15px;max-width:720px;margin:8px 0 0}

/* Panels */
.lab{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:16px;margin:16px 0}
.controls{display:flex;flex-wrap:wrap;gap:12px 20px;align-items:flex-end}
.controls label{display:flex;flex-direction:column;gap:4px;color:var(--muted);font-size:12px}
select,button{font:inherit;color:var(--ink)}
select{min-width:11rem;height:32px;padding:0 8px;background:var(--surface);border:1px solid var(--line-strong);border-radius:4px}
button{height:32px;padding:0 14px;background:var(--surface);border:1px solid var(--line-strong);border-radius:4px;cursor:pointer}
button:hover{background:var(--surface2)}
button:active{background:var(--line)}
button.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
button.primary:hover{filter:brightness(1.1)}
input[type=range]{width:150px;accent-color:var(--accent);vertical-align:middle}
.controls label>span{display:flex;align-items:center;gap:6px;height:32px}
.rangeval{font-family:var(--num);font-size:13px;color:var(--ink);display:inline-block;min-width:2.4em}
.presets{display:flex;flex-wrap:wrap;gap:6px;margin-top:14px;align-items:center;color:var(--muted);font-size:12px}
.presets button{height:26px;padding:0 10px;font-size:12px}

/* Layer histograms */
.strip{display:grid;grid-template-columns:repeat(auto-fit,minmax(118px,1fr));gap:8px;margin:16px 0 8px}
.tile{background:var(--surface2);border:1px solid var(--line);border-radius:4px;padding:6px}
.tile canvas{display:block;width:100%;height:84px}
.tile .cap{font-size:12px;color:var(--muted);display:flex;justify-content:space-between;gap:4px;margin-top:4px}
.tile .cap b{font-family:var(--num);font-weight:400;color:var(--ink)}
.chart{display:block;width:100%}
.legend{display:flex;flex-wrap:wrap;gap:4px 18px;font-size:12px;color:var(--muted);margin-top:6px}
.sw{display:inline-block;width:14px;height:3px;vertical-align:middle;margin-right:6px}
.insight{background:var(--surface2);border:1px solid var(--line);border-left:4px solid var(--act);border-radius:4px;padding:10px 12px;margin:14px 0 0}
.insight.bad{border-left-color:var(--l2)}
.insight.warn{border-left-color:var(--grad)}

/* Math */
.eq{font-family:'Cambria Math',Cambria,'Times New Roman',serif;font-style:italic;font-size:17px;background:var(--surface);border:1px solid var(--line);border-radius:4px;padding:8px 12px;margin:8px 0 14px;overflow-x:auto;white-space:nowrap}
.eq .why{font-style:normal;font-family:var(--ui);font-size:12px;color:var(--muted);margin-left:14px;white-space:normal}
ol.steps{padding-left:22px;max-width:720px}
ol.steps li{margin-bottom:10px;padding-left:4px}

/* Table */
.scroll{overflow-x:auto;margin:12px 0;background:var(--surface);border:1px solid var(--line);border-radius:8px}
table{border-collapse:collapse;width:100%;min-width:640px}
th,td{text-align:left;padding:8px 12px;border-bottom:1px solid var(--line);vertical-align:top}
tbody tr:last-child td{border-bottom:0}
tbody tr:hover{background:var(--surface2)}
th{font-weight:600;font-size:12px;color:var(--muted);background:var(--surface2)}
td.f,td.v{white-space:nowrap}
td.v{font-family:var(--num);font-size:13px}

/* Training race */
.lanes{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin-top:16px}
.lane{background:var(--surface2);border:1px solid var(--line);border-top:3px solid var(--c);border-radius:4px;padding:10px}
.lane select{width:100%;min-width:0;margin-bottom:8px}
.lane canvas.bd{display:block;width:100%;aspect-ratio:1/1;border:1px solid var(--line);background:var(--surface)}
.lane canvas.gb{display:block;width:100%;height:46px;margin-top:8px}
.lane .stat{margin-top:8px;display:flex;justify-content:space-between;gap:8px}
.lane .stat b{font-family:var(--num);font-weight:400}
.lane .status{font-size:12px;color:var(--muted);min-height:18px}
.lane .gl{font-size:11px;color:var(--muted);display:flex;justify-content:space-between}
.runbar{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-top:14px}
.stepcount{font-family:var(--num);font-size:13px;color:var(--muted)}

footer{color:var(--muted);font-size:12px;border-top:1px solid var(--line);margin-top:40px;padding-top:16px}
@media (max-width:600px){
  select{min-width:9rem}
  .wrap{padding:0 12px 32px}
}