:root {
  --bg: #0b0d10;
  --panel: #14171c;
  --panel-2: #1b1f26;
  --line: #2a3038;
  --text: #f4f5f7;
  --muted: #9aa3ae;
  --accent: #ff5a1f;
  --accent-2: #ff8a3d;
  --ok: #3ddc84;
  --warn: #ffc53d;
  --bad: #ff4d4f;
  --radius: 16px;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-tap-highlight-color: transparent;
}

button { font: inherit; color: inherit; cursor: pointer; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 14px max(16px, env(safe-area-inset-left));
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; font-size: 20px; letter-spacing: .02em; }
.tagline { color: var(--muted); font-size: 14px; }

main { max-width: 1280px; margin: 0 auto; padding: 16px; }

.cockpit { display: grid; gap: 16px; }
@media (min-width: 900px) {
  .cockpit { grid-template-columns: minmax(380px, 5fr) 6fr; align-items: start; }
  .dash { position: sticky; top: 16px; }
}

.dash, .controls {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
}

/* Tachometer */
.gauge { position: relative; width: min(100%, 420px); margin: 0 auto; aspect-ratio: 1; }
.gauge svg { width: 100%; height: 100%; display: block; }
.tick { stroke: var(--muted); stroke-width: 2; }
.tick.major { stroke: var(--text); stroke-width: 3; }
.tick-label { fill: var(--muted); font-size: 15px; font-weight: 600; text-anchor: middle; dominant-baseline: middle; }
.arc-bg { fill: none; stroke: var(--panel-2); stroke-width: 14; }
.arc-red { fill: none; stroke: var(--bad); stroke-width: 14; opacity: .75; }
.arc-live { fill: none; stroke: var(--accent); stroke-width: 14; stroke-linecap: round; }
.needle { stroke: var(--text); stroke-width: 4; stroke-linecap: round; }
.hub { fill: var(--text); }
.gauge.shift .arc-live { stroke: var(--bad); }

.readout {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding-top: 56%;
  pointer-events: none;
}
.gear {
  margin-top: 8px;
  font-size: 24px;
  font-weight: 800;
  min-width: 48px;
  text-align: center;
  border: 2px solid var(--line);
  border-radius: 10px;
  line-height: 1.4;
}
.speed { font-size: clamp(40px, 11vw, 68px); font-weight: 800; line-height: 1; font-variant-numeric: tabular-nums; }
.speed small { font-size: 18px; font-weight: 600; color: var(--muted); margin-left: 6px; }
.rpm { color: var(--muted); font-variant-numeric: tabular-nums; margin-top: 4px; }

.status { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; margin: 12px 0 16px; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  font-size: 14px;
}
.chip b { font-weight: 600; }
.chip i { width: 9px; height: 9px; border-radius: 50%; background: var(--muted); }
.chip.ok i { background: var(--ok); box-shadow: 0 0 8px var(--ok); }
.chip.warn i { background: var(--warn); }
.chip.bad i { background: var(--bad); }

.start {
  width: 100%;
  padding: 20px;
  border: 0;
  border-radius: 14px;
  background: linear-gradient(180deg, var(--accent-2), var(--accent));
  color: #fff;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: .02em;
  box-shadow: 0 6px 24px rgb(255 90 31 / .25);
}
.start:active { transform: translateY(1px); }
.start.on { background: var(--panel-2); border: 2px solid var(--accent); box-shadow: none; }

.volume { display: flex; align-items: center; gap: 14px; margin-top: 16px; color: var(--muted); font-weight: 600; }
.volume input { flex: 1; }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 36px;
  background: transparent;
  width: 100%;
}
input[type="range"]::-webkit-slider-runnable-track { height: 8px; border-radius: 4px; background: var(--line); }
input[type="range"]::-moz-range-track { height: 8px; border-radius: 4px; background: var(--line); }
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 28px; height: 28px; margin-top: -10px;
  border-radius: 50%; background: var(--text); border: 4px solid var(--accent);
}
input[type="range"]::-moz-range-thumb { width: 20px; height: 20px; border-radius: 50%; background: var(--text); border: 4px solid var(--accent); }

/* Controls */
.modes, .seg { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; background: var(--panel-2); border-radius: 12px; padding: 4px; gap: 4px; }
.modes button, .seg button { border: 0; background: transparent; padding: 14px 8px; border-radius: 9px; font-weight: 700; color: var(--muted); }
.seg button { padding: 8px 16px; }
.modes button[aria-selected="true"], .seg button[aria-pressed="true"] { background: var(--text); color: var(--bg); }
.mode-hint { color: var(--muted); font-size: 14px; margin: 10px 2px 14px; min-height: 1.5em; }

.pedals { display: grid; grid-template-columns: 1fr 1fr 1.2fr; gap: 12px; margin-bottom: 8px; align-items: stretch; }
.pedals[hidden] { display: none; }
.pedal {
  position: relative;
  height: 200px;
  border-radius: 14px;
  background: var(--panel-2);
  border: 2px solid var(--line);
  overflow: hidden;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}
.pedal .fill { position: absolute; left: 0; right: 0; bottom: 0; height: 0; }
.pedal.gas .fill { background: linear-gradient(0deg, var(--accent), rgb(255 138 61 / .5)); }
.pedal.brake .fill { background: linear-gradient(0deg, #3a6df0, rgb(58 109 240 / .4)); }
.pedal span { position: absolute; inset: 0; display: grid; place-items: center; font-weight: 800; font-size: 18px; letter-spacing: .05em; text-transform: uppercase; }
.pedal:focus-visible, .revhold:focus-visible { outline: 3px solid var(--accent-2); outline-offset: 2px; }

.revhold {
  border: 2px solid var(--line);
  background: var(--panel-2);
  border-radius: 14px;
  font-weight: 800;
  padding: 14px;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}
.revhold.active { border-color: var(--accent); background: rgb(255 90 31 / .18); }
.revhold:disabled { opacity: .4; cursor: not-allowed; }
.revhold.wide { width: 100%; padding: 22px; font-size: 18px; margin-bottom: 8px; }
.revhold.wide[hidden] { display: none; }

.notice { background: rgb(255 197 61 / .08); border: 1px solid rgb(255 197 61 / .4); border-radius: 12px; padding: 14px 16px; margin: 12px 0; font-size: 15px; }
.notice ul { margin: 8px 0; padding-left: 20px; }

.section-title { font-size: 14px; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); margin: 22px 2px 10px; }

.engines { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 10px; }
.engine {
  text-align: left;
  padding: 14px;
  border-radius: 12px;
  background: var(--panel-2);
  border: 2px solid transparent;
}
.engine[aria-pressed="true"] { border-color: var(--accent); background: rgb(255 90 31 / .08); }
.engine strong { display: block; font-size: 17px; }
.engine .meta { display: block; color: var(--accent-2); font-size: 13px; font-weight: 600; margin: 2px 0 6px; }
.engine .blurb { display: block; color: var(--muted); font-size: 13px; line-height: 1.4; }

.settings { margin-top: 18px; border-top: 1px solid var(--line); padding-top: 6px; }
.settings summary { cursor: pointer; padding: 12px 2px; font-weight: 700; }
.setting { padding: 8px 2px; }
.setting label { display: flex; justify-content: space-between; font-weight: 600; }
.setting output { color: var(--muted); font-variant-numeric: tabular-nums; }
.setting p { margin: 0; color: var(--muted); font-size: 13px; }
.setting.row { display: flex; align-items: center; justify-content: space-between; gap: 12px; font-weight: 600; }
.setting.check input { width: 24px; height: 24px; accent-color: var(--accent); }
.link { background: none; border: 0; color: var(--muted); text-decoration: underline; padding: 10px 2px; }

/* Info */
.info { display: grid; gap: 16px; margin-top: 24px; }
@media (min-width: 900px) { .info { grid-template-columns: 1fr 1fr; } }
.info > div { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 24px; }
.info h2 { margin-top: 0; }
.howto li { margin-bottom: 8px; }
.faq details { border-top: 1px solid var(--line); }
.faq summary { cursor: pointer; padding: 12px 0; font-weight: 600; }
.faq p { margin: 0 0 14px; color: var(--muted); }

footer { max-width: 1280px; margin: 0 auto; padding: 24px 16px 48px; color: var(--muted); font-size: 14px; text-align: center; }

.tap-to-start {
  position: fixed;
  inset: 0;
  border: 0;
  background: rgb(11 13 16 / .85);
  color: var(--text);
  font-size: 26px;
  font-weight: 800;
  z-index: 10;
}
.tap-to-start[hidden] { display: none; }