:root {
  --bg: #0b0c0e; --fg: #f2f2f2; --muted: #8a8f98; --panel: #17191d;
  --accent: #e82127; --ok: #3ddc84;
  color-scheme: dark;
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 20px/1.4 system-ui, -apple-system, "Segoe UI", sans-serif;
  -webkit-user-select: none; user-select: none;
}
main { max-width: 720px; margin: 0 auto; padding: 24px 16px; }
h1 { margin: 0; font-size: 40px; letter-spacing: .02em; }
.tagline { margin: 4px 0 0; color: var(--muted); font-size: 22px; font-style: italic; }
.sub { margin: 0 0 24px; color: var(--accent); font-weight: 700; text-transform: uppercase; letter-spacing: .15em; }
label { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--panel); }
select, input[type=range] { font: inherit; min-width: 50%; }
select { background: var(--panel); color: var(--fg); border: 0; border-radius: 10px; padding: 12px; }
.row { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 12px; }
button { font: inherit; font-weight: 600; padding: 18px 26px; border-radius: 14px; border: 0; background: var(--panel); color: var(--fg); cursor: pointer; }
button.primary { background: var(--accent); }
.muted { color: var(--muted); font-size: 16px; }

#run { text-align: center; position: relative; }
.cluster { position: relative; width: min(80vw, 420px); margin: 0 auto; }
.tach { width: 100%; transform: rotate(135deg); }
.tach circle { fill: none; stroke-width: 12; stroke-linecap: round; }
.tach .track { stroke: var(--panel); stroke-dasharray: 75 100; }
.tach .bar { stroke: var(--ok); stroke-dasharray: 0 100; transition: stroke .15s; }
.tach .bar.hot { stroke: var(--accent); }
.center { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; font-size: 18px; color: var(--muted); }
.gear { font-size: 110px; font-weight: 800; color: var(--fg); line-height: 1; }
.speed { font-size: 48px; font-weight: 700; margin-top: -24px; }
.chrono { font-size: 28px; color: var(--accent); min-height: 40px; font-variant-numeric: tabular-nums; }
.stop { margin-top: 24px; }
.ludicrous {
  position: absolute; top: 30%; left: 0; right: 0; font-size: 64px; font-weight: 900; font-style: italic;
  color: var(--accent); letter-spacing: .1em; opacity: 0; pointer-events: none;
}
.ludicrous.on { animation: flash 1.6s ease-out; }
@keyframes flash { 0% { opacity: 0; transform: scale(.6); } 15% { opacity: 1; transform: scale(1.1); } 100% { opacity: 0; transform: scale(1.4); } }

dialog { background: var(--panel); color: var(--fg); border: 0; border-radius: 18px; max-width: 520px; padding: 28px; }
dialog::backdrop { background: rgba(0,0,0,.7); }