/* ============================================================
   EngineLab — style.css
   Design tokens
   --bg-0  #0a0b0d   near-black graphite base
   --bg-1  #131519   panel base
   --bg-2  #1b1e24   raised panel
   --line  #2a2e35   hairline borders
   --ink-0 #f1f3f5   primary text
   --ink-1 #9aa1ab   secondary text
   --ink-2 #5b6168   tertiary / labels
   --accent (per-car, set as --car-accent on :root)
   --danger #ff4d4d  redline / warnings
   Type: "Rajdhani" (gauge digits, condensed technical), "Inter" (UI body),
         "JetBrains Mono" (telemetry data)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Rajdhani:wght@500;600;700&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;700&display=swap');

* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-0: #0a0b0d;
  --bg-1: #121419;
  --bg-2: #1a1d23;
  --bg-3: #21242b;
  --line: #2a2e36;
  --line-soft: #1f222a;
  --ink-0: #f1f3f5;
  --ink-1: #9aa1ab;
  --ink-2: #5e6470;
  --danger: #ff4747;
  --warn: #ffb347;
  --car-accent: #6fb7ff;
  --car-accent-dim: rgba(111, 183, 255, 0.18);
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;
  font-size: 16px;
}

html, body {
  height: 100%;
  background: var(--bg-0);
  color: var(--ink-0);
  font-family: 'Inter', sans-serif;
  overflow: hidden;
}

::selection { background: var(--car-accent); color: #0a0b0d; }

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

.mono { font-family: 'JetBrains Mono', monospace; }

/* ---------------- environment backdrop ---------------- */

#app {
  position: relative;
  height: 100vh;
  width: 100vw;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(ellipse 120% 70% at 50% -10%, rgba(255,255,255,0.05), transparent 60%),
    linear-gradient(180deg, #0c0d10 0%, #08090b 100%);
  transition: background 0.6s ease;
}

#app.env-garage {
  background:
    radial-gradient(ellipse 90% 50% at 50% 0%, rgba(255, 200, 120, 0.06), transparent 60%),
    linear-gradient(180deg, #111114 0%, #08090a 70%);
}
#app.env-highway {
  background:
    radial-gradient(ellipse 100% 60% at 50% -5%, rgba(120, 170, 255, 0.08), transparent 65%),
    linear-gradient(180deg, #0c1018 0%, #07080b 75%);
}
#app.env-racetrack {
  background:
    radial-gradient(ellipse 100% 55% at 50% -5%, rgba(255, 110, 80, 0.08), transparent 60%),
    linear-gradient(180deg, #120c0c 0%, #07080a 75%);
}

.env-streaks {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  opacity: 0;
  transition: opacity 0.4s ease;
  z-index: 0;
}
.env-streaks.active { opacity: 1; }
.streak {
  position: absolute;
  height: 2px;
  width: 140px;
  left: -160px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.5), transparent);
  border-radius: 2px;
  animation: streak-move linear infinite;
}
@keyframes streak-move {
  from { transform: translateX(0); }
  to { transform: translateX(calc(100vw + 300px)); }
}

/* ---------------- top bar ---------------- */

.topbar {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 22px;
  border-bottom: 1px solid var(--line-soft);
  background: rgba(10, 11, 13, 0.55);
  backdrop-filter: blur(14px);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-family: 'Rajdhani', sans-serif;
}
.brand .mark {
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 0.5px;
}
.brand .mark span { color: var(--car-accent); }
.brand .tag {
  font-size: 11px;
  color: var(--ink-2);
  letter-spacing: 2px;
  text-transform: uppercase;
}

.topbar-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.pill-toggle {
  display: flex;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px;
  gap: 2px;
}
.pill-toggle button {
  font-size: 12px;
  font-weight: 600;
  padding: 6px 13px;
  border-radius: 999px;
  color: var(--ink-1);
  letter-spacing: 0.3px;
  transition: background 0.2s, color 0.2s;
}
.pill-toggle button.active {
  background: var(--car-accent);
  color: #08090b;
}

.icon-btn {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-1);
  transition: border-color 0.2s, color 0.2s;
}
.icon-btn:hover { border-color: var(--car-accent); color: var(--ink-0); }
.icon-btn svg { width: 17px; height: 17px; }

.volume-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0 10px;
  height: 36px;
}
.volume-wrap input[type="range"] {
  width: 80px;
}

/* ---------------- layout ---------------- */

.layout {
  position: relative;
  z-index: 1;
  flex: 1;
  display: grid;
  grid-template-columns: 300px 1fr 300px;
  gap: 16px;
  padding: 16px 20px 20px;
  min-height: 0;
}

.col { display: flex; flex-direction: column; gap: 14px; min-height: 0; }
.col-left, .col-right { overflow-y: auto; }
.col::-webkit-scrollbar { width: 6px; }
.col::-webkit-scrollbar-thumb { background: var(--line); border-radius: 4px; }

/* ---------------- glass cards ---------------- */

.card {
  background: linear-gradient(165deg, rgba(255,255,255,0.045), rgba(255,255,255,0.01)), var(--bg-1);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 16px;
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 0 rgba(255,255,255,0.03) inset, 0 12px 30px -16px rgba(0,0,0,0.6);
}

.card-title {
  font-family: 'Rajdhani', sans-serif;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--ink-2);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.card-title .hint { font-size: 10px; color: var(--ink-2); letter-spacing: 0.5px; text-transform: none; font-family: 'JetBrains Mono', monospace; }

/* ---------------- car selector ---------------- */

.car-list { display: flex; flex-direction: column; gap: 8px; }
.car-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  background: var(--bg-2);
  transition: border-color 0.18s, transform 0.18s, background 0.18s;
  text-align: left;
  width: 100%;
}
.car-row:hover { transform: translateX(2px); border-color: var(--line); }
.car-row.active {
  border-color: var(--car-accent);
  background: linear-gradient(90deg, var(--car-accent-dim), transparent 80%);
}
.car-row .swatch {
  width: 8px; height: 30px; border-radius: 4px; flex-shrink: 0;
  background: var(--row-accent, #888);
  box-shadow: 0 0 10px var(--row-accent, transparent);
}
.car-row .meta { display: flex; flex-direction: column; gap: 1px; min-width: 0; }
.car-row .name { font-weight: 600; font-size: 13.5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.car-row .sub { font-size: 11px; color: var(--ink-2); font-family: 'JetBrains Mono', monospace; }

/* ---------------- specs panel ---------------- */

.specs-blurb {
  font-size: 12.5px;
  color: var(--ink-1);
  line-height: 1.5;
  margin-bottom: 12px;
}
.spec-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.spec-item {
  background: var(--bg-2);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
}
.spec-item .v {
  font-family: 'Rajdhani', sans-serif;
  font-size: 18px;
  font-weight: 700;
  color: var(--car-accent);
}
.spec-item .l {
  font-size: 9.5px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--ink-2);
  margin-top: 1px;
}

/* ---------------- center cluster ---------------- */

.col-center {
  align-items: center;
  justify-content: flex-start;
  gap: 10px;
}

.gauge-card {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 18px 18px 8px;
  position: relative;
}

.gauge-stack {
  position: relative;
  width: min(100%, 380px);
  aspect-ratio: 1 / 1;
}
.gauge-stack svg, .gauge-stack canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.speedo-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-bottom: 14px;
}
.speedo-stack {
  width: min(72%, 220px);
  margin: 2px auto 0;
}
.speedo-stack .speed-num { font-size: 34px; }

.gauge-readout {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}
.gauge-readout .rpm-num {
  font-family: 'Rajdhani', sans-serif;
  font-weight: 700;
  font-size: 52px;
  line-height: 1;
  letter-spacing: 1px;
  color: var(--ink-0);
  text-shadow: 0 0 24px var(--car-accent-dim);
  font-variant-numeric: tabular-nums;
}
.gauge-readout .rpm-lbl {
  font-size: 10px;
  letter-spacing: 3px;
  color: var(--ink-2);
  margin-top: 2px;
}
.gauge-readout .gear-badge {
  margin-top: 10px;
  width: 56px;
  height: 56px;
  border-radius: 14px;
  border: 1.5px solid var(--line);
  background: var(--bg-2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Rajdhani', sans-serif;
  font-weight: 700;
  font-size: 28px;
  box-shadow: 0 0 0 0 var(--car-accent-dim);
  transition: box-shadow 0.15s, border-color 0.15s;
  pointer-events: auto;
}
.gear-badge.flash {
  border-color: var(--car-accent);
  box-shadow: 0 0 22px var(--car-accent-dim);
}

.gauge-card.limiter .gauge-stack { animation: limiter-flash 0.12s infinite; }
@keyframes limiter-flash {
  0%, 100% { filter: brightness(1); }
  50% { filter: brightness(1.35) saturate(1.3); }
}

.stall-banner {
  position: absolute;
  bottom: 6px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--danger);
  font-weight: 700;
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
  text-shadow: 0 0 14px rgba(255,71,71,0.6);
}
.stall-banner.show { opacity: 1; }

/* speedometer + rpm bar row */

.sub-gauges {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 14px;
  margin-top: 6px;
}
.speed-block { text-align: center; }
.speed-num {
  font-family: 'Rajdhani', sans-serif;
  font-weight: 700;
  font-size: 38px;
  font-variant-numeric: tabular-nums;
}
.speed-unit { font-size: 11px; color: var(--ink-2); letter-spacing: 2px; }
.odo {
  font-size: 10px;
  color: var(--ink-2);
  margin-top: 4px;
  font-family: 'JetBrains Mono', monospace;
}

.divider-v { width: 1px; height: 46px; background: var(--line); }

/* rpm bar (LED style) */
.rpm-bar-card { width: 100%; }
.rpm-bar {
  display: flex;
  gap: 3px;
  height: 22px;
}
.rpm-led {
  flex: 1;
  border-radius: 3px;
  background: var(--bg-2);
  border: 1px solid var(--line-soft);
  transition: background 0.05s, box-shadow 0.05s;
}
.rpm-led.on { background: var(--led-color, var(--car-accent)); box-shadow: 0 0 8px var(--led-color, var(--car-accent)); border-color: transparent; }
.rpm-bar-labels {
  display: flex;
  justify-content: space-between;
  font-size: 9.5px;
  color: var(--ink-2);
  margin-top: 5px;
  font-family: 'JetBrains Mono', monospace;
}

/* pedal indicators */
.pedal-row {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.pedal {
  background: var(--bg-2);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  padding: 10px 12px;
}
.pedal .lbl {
  font-size: 10px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--ink-2);
  display: flex;
  justify-content: space-between;
  margin-bottom: 6px;
}
.pedal .lbl b { color: var(--ink-1); font-family: 'JetBrains Mono', monospace; font-weight: 500; }
.pedal-track {
  height: 6px;
  border-radius: 4px;
  background: var(--bg-3);
  overflow: hidden;
}
.pedal-fill { height: 100%; width: 0%; border-radius: 4px; transition: width 0.04s linear; }
.pedal-fill.throttle { background: linear-gradient(90deg, #4dff91, #b6ff4d); }
.pedal-fill.brake { background: linear-gradient(90deg, #ff4d4d, #ff8a4d); }
.pedal-fill.clutch { background: linear-gradient(90deg, #4d9fff, #4dd9ff); }

/* ---------------- right column: telemetry & modes ---------------- */

.tele-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.tele-item {
  background: var(--bg-2);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  padding: 9px 10px;
}
.tele-item .v { font-family: 'JetBrains Mono', monospace; font-weight: 700; font-size: 15px; color: var(--ink-0); }
.tele-item .l { font-size: 9px; letter-spacing: 1px; text-transform: uppercase; color: var(--ink-2); margin-top: 2px; }

.mode-btn-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.mode-btn {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 10px;
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-1);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 3px;
  transition: border-color 0.18s, color 0.18s, background 0.18s;
}
.mode-btn .k { font-size: 9px; color: var(--ink-2); font-family: 'JetBrains Mono', monospace; letter-spacing: 0.5px; }
.mode-btn:hover { border-color: var(--car-accent); color: var(--ink-0); }
.mode-btn.active { background: linear-gradient(90deg, var(--car-accent-dim), transparent 90%); border-color: var(--car-accent); color: var(--ink-0); }

.env-select { display: flex; gap: 6px; }
.env-select button {
  flex: 1;
  padding: 8px 4px;
  font-size: 11px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--bg-2);
  color: var(--ink-1);
  transition: border-color 0.18s, color 0.18s;
}
.env-select button.active { border-color: var(--car-accent); color: var(--ink-0); background: var(--car-accent-dim); }

.upload-row {
  display: flex;
  align-items: center;
  gap: 8px;
}
.upload-row label {
  flex: 1;
  font-size: 11.5px;
  padding: 9px 10px;
  border: 1px dashed var(--line);
  border-radius: var(--radius-sm);
  color: var(--ink-2);
  text-align: center;
  cursor: pointer;
  transition: border-color 0.18s, color 0.18s;
}
.upload-row label:hover { border-color: var(--car-accent); color: var(--ink-1); }
.upload-row input[type="file"] { display: none; }
.upload-status { font-size: 10.5px; color: var(--ink-2); margin-top: 6px; font-family: 'JetBrains Mono', monospace; }

.keylist { display: flex; flex-direction: column; gap: 6px; }
.keyrow { display: flex; align-items: center; justify-content: space-between; font-size: 12px; color: var(--ink-1); }
.keyrow .key {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 2px 7px;
  color: var(--ink-0);
  min-width: 26px;
  text-align: center;
}

/* dyno mode chart */
.dyno-wrap { width: 100%; }
.dyno-wrap canvas { width: 100%; height: 110px; display: block; }
.dyno-readout { display: flex; justify-content: space-between; font-size: 11px; color: var(--ink-1); margin-top: 6px; font-family: 'JetBrains Mono', monospace; }

/* ---------------- start overlay ---------------- */

.start-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  background: radial-gradient(circle at 50% 40%, rgba(20,22,26,0.97), rgba(6,7,8,0.99));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 22px;
  text-align: center;
  transition: opacity 0.5s ease, visibility 0.5s;
}
.start-overlay.hidden { opacity: 0; visibility: hidden; pointer-events: none; }
.start-overlay h1 {
  font-family: 'Rajdhani', sans-serif;
  font-size: 44px;
  font-weight: 700;
  letter-spacing: 1px;
}
.start-overlay h1 span { color: var(--car-accent); }
.start-overlay p { color: var(--ink-1); font-size: 14px; max-width: 420px; line-height: 1.6; }
.start-btn {
  margin-top: 6px;
  padding: 14px 34px;
  border-radius: 999px;
  background: var(--ink-0);
  color: #0a0b0d;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 1px;
  text-transform: uppercase;
  transition: transform 0.15s, box-shadow 0.15s;
  box-shadow: 0 0 0 0 var(--car-accent);
}
.start-btn:hover { transform: translateY(-2px) scale(1.02); box-shadow: 0 8px 30px -8px var(--car-accent); }

/* ---------------- key-press feedback toast ---------------- */

.toast-stack {
  position: fixed;
  bottom: 18px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 40;
  display: flex;
  flex-direction: column-reverse;
  gap: 6px;
  pointer-events: none;
}
.toast {
  background: rgba(20,22,26,0.85);
  border: 1px solid var(--line);
  backdrop-filter: blur(8px);
  padding: 7px 16px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.4px;
  color: var(--ink-0);
  opacity: 0;
  animation: toast-pop 1.4s ease forwards;
}
@keyframes toast-pop {
  0% { opacity: 0; transform: translateY(6px) scale(0.96); }
  12% { opacity: 1; transform: translateY(0) scale(1); }
  80% { opacity: 1; }
  100% { opacity: 0; transform: translateY(-6px) scale(0.98); }
}

/* ---------------- exhaust flame / speed blur fx ---------------- */

.flame-fx {
  position: absolute;
  left: 50%;
  bottom: -6px;
  width: 70px;
  height: 70px;
  transform: translateX(-50%) scale(0);
  pointer-events: none;
  opacity: 0;
}
.flame-fx.pop {
  animation: flame-pop 0.32s ease-out;
}
@keyframes flame-pop {
  0% { transform: translateX(-50%) scale(0.3); opacity: 0.9; }
  60% { transform: translateX(-50%) scale(1.15); opacity: 0.7; }
  100% { transform: translateX(-50%) scale(1.6); opacity: 0; }
}

.speed-blur {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 5;
  opacity: 0;
  transition: opacity 0.4s ease;
  background: radial-gradient(circle at 50% 50%, transparent 38%, rgba(0,0,0,0.5) 100%);
  box-shadow: inset 0 0 140px 40px rgba(0,0,0,0.6);
}
.speed-blur.show { opacity: var(--blur-amt, 0); }

/* ---------------- responsive ---------------- */

@media (max-width: 1080px) {
  .layout { grid-template-columns: 1fr; grid-template-rows: auto auto auto; overflow-y: auto; }
  .col-left, .col-right { overflow-y: visible; }
  #app { overflow-y: auto; }
}

@media (max-width: 560px) {
  .start-overlay h1 { font-size: 32px; }
  .gauge-readout .rpm-num { font-size: 38px; }
  .topbar { flex-wrap: wrap; gap: 10px; }
  .speed-num { font-size: 28px; }
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

:focus-visible {
  outline: 2px solid var(--car-accent);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}