:root {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --ink: #12161d;
  --dim: #63707f;
  --line: #ccd5de;
  --ball: #6b7480;
  --ball-hi: #eef2f6;
  --hot: #d64541;
  --cool: #2f6fb0;
  --accent: #1d7a5f;
  --shadow: 0 1px 2px rgba(18,22,29,.08), 0 8px 24px rgba(18,22,29,.06);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161b;
    --panel: #1a1f26;
    --ink: #e7ecf2;
    --dim: #93a1b1;
    --line: #2f3946;
    --ball: #8f9aa8;
    --ball-hi: #d7dee7;
    --hot: #ff6b63;
    --cool: #6aa9e8;
    --accent: #55c39c;
    --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.35);
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, Roboto, Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}
.top { padding: 18px 20px 4px; max-width: 1240px; margin: 0 auto; }
.top h1 { margin: 0; font-size: 26px; letter-spacing: -.01em; }
.top .sub { margin: 4px 0 0; color: var(--dim); font-size: 14px; }
.tabs {
  display: flex; gap: 6px; flex-wrap: wrap;
  padding: 12px 20px 0; max-width: 1240px; margin: 0 auto;
}
.tab {
  appearance: none; border: 1px solid var(--line); background: transparent;
  color: var(--dim); border-radius: 999px; padding: 6px 14px; font: inherit;
  font-size: 14px; cursor: pointer;
}
.tab:hover { color: var(--ink); }
.tab.on { background: var(--panel); color: var(--ink); border-color: var(--line); box-shadow: var(--shadow); }
main { max-width: 1240px; margin: 0 auto; padding: 14px 20px 26px; }
.layout { display: grid; grid-template-columns: minmax(0,1fr) 288px; gap: 16px; align-items: start; }
@media (max-width: 900px) { .layout { grid-template-columns: minmax(0,1fr); } }
.stage { min-width: 0; }
.panel {
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  box-shadow: var(--shadow); padding: 10px; min-width: 0;
}
.panel[hidden] { display: none !important; }
.panel.wide { padding: 18px 22px; }
.canvas { display: block; width: 100%; height: min(58vh, 480px); min-height: 280px; border-radius: 8px; }
.cap { color: var(--dim); font-size: 13px; margin: 8px 4px 2px; }
.cap p { margin: 4px 0; }
.side { display: flex; flex-direction: column; gap: 10px; min-width: 0; }
.ctl {
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  padding: 9px 12px; box-shadow: var(--shadow);
}
.ctl label { display: block; font-size: 13px; color: var(--dim); margin-bottom: 4px; }
.ctl .val { color: var(--ink); font-weight: 600; float: right; }
.ctl input[type=range] { width: 100%; min-height: 28px; }
.ctl.row input[type=checkbox] { width: 20px; height: 20px; vertical-align: -4px; }
#cv-cradle { cursor: pointer; touch-action: manipulation; }
/* phones: the cradle drawing is width-limited, so a tall canvas was mostly empty */
@media (max-width: 600px) { #cv-cradle { height: auto; aspect-ratio: 4 / 3; min-height: 0; } }
.ctl select { width: 100%; font: inherit; font-size: 13px; padding: 4px; border-radius: 6px;
  border: 1px solid var(--line); background: var(--bg); color: var(--ink); }
.ctl.row label { display: flex; align-items: center; gap: 8px; margin: 0; color: var(--ink); }
.btns { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.btns button {
  appearance: none; font: inherit; font-size: 14px; padding: 8px 10px; cursor: pointer;
  border-radius: 8px; border: 1px solid var(--line); background: var(--panel); color: var(--ink);
  box-shadow: var(--shadow);
}
.btns button.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
.btns button:hover { border-color: var(--dim); }
.readout {
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  padding: 8px 12px; box-shadow: var(--shadow); font-size: 12.5px;
}
.readout div { display: flex; justify-content: space-between; gap: 8px; padding: 2px 0; }
.readout span { color: var(--dim); }
.readout b { font-weight: 600; font-variant-numeric: tabular-nums; text-align: right; }
.vels {
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  padding: 8px 12px; box-shadow: var(--shadow);
}
.vels h2 { font-size: 12px; color: var(--dim); margin: 2px 0 6px; font-weight: 600; text-transform: uppercase; letter-spacing: .04em; }
.vrow { display: grid; grid-template-columns: 16px 1fr 58px; align-items: center; gap: 6px; padding: 1px 0; }
.vlab { font-size: 11px; color: var(--dim); }
.vtrack { position: relative; height: 9px; background: var(--bg); border-radius: 5px; display: block; overflow: hidden; }
.vbar { position: absolute; top: 0; height: 100%; display: block; }
.vpos { left: 50%; background: var(--cool); }
.vneg { right: 50%; background: var(--hot); }
.vnum { font-size: 11px; font-variant-numeric: tabular-nums; text-align: right; color: var(--ink); }
.prose { max-width: 74ch; }
.prose h3 { font-size: 17px; margin: 22px 0 6px; }
.prose h3:first-child { margin-top: 2px; }
.prose h4 { font-size: 14.5px; margin: 16px 0 4px; color: var(--dim); }
.prose p { margin: 8px 0; }
.prose ul { margin: 8px 0; padding-left: 20px; }
.prose li { margin: 5px 0; }
.prose .lede { color: var(--dim); font-size: 13.5px; }
.prose .note { color: var(--dim); font-size: 13px; }
.prose blockquote {
  margin: 10px 0; padding: 10px 14px; border-left: 3px solid var(--accent);
  background: var(--bg); border-radius: 0 8px 8px 0; font-style: italic;
}
.prose code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12.5px; }
.tablewrap { overflow-x: auto; margin: 10px 0; }
.tablewrap table { border-collapse: collapse; font-size: 13px; min-width: 100%; }
.tablewrap th, .tablewrap td {
  border: 1px solid var(--line); padding: 6px 9px; text-align: left; vertical-align: top;
}
.tablewrap th { background: var(--bg); font-weight: 600; white-space: nowrap; }
.foot { max-width: 1240px; margin: 0 auto; padding: 4px 20px 30px; color: var(--dim); font-size: 12.5px; }
.foot code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }