:root {
  --paper: #e2e5df;
  --sheet: #eceee9;
  --rule: #c3c9c1;
  --ink: #1b2125;
  --ink-2: #4e575b;
  --ink-3: #7a8386;
  --heat: #e05a1e;
  --heat-hot: #ffc857;
  --charge: #2d56a3;
  --charge-light: #7e9bd0;
  --rust: #8a4b32;
  --red: #c2281c;
  --metal: #aeb6b8;
  --ok: #3f7d4e;
  --font: "Barlow", system-ui, sans-serif;
  --font-semi: "Barlow Semi Condensed", "Barlow", system-ui, sans-serif;
  --font-cond: "Barlow Condensed", "Barlow", system-ui, sans-serif;
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

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

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--paper);
  background-image: linear-gradient(rgba(27, 33, 37, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(27, 33, 37, 0.045) 1px, transparent 1px);
  background-size: 24px 24px;
  color: var(--ink);
  font: 400 15px/1.45 var(--font);
}

button,
select,
input {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
}

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

canvas {
  display: block;
}

h2 {
  margin: 0;
  font: 600 17px/1.2 var(--font-semi);
}

/* ---------- masthead ---------- */

.masthead {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px 24px;
  max-width: 1480px;
  margin: 0 auto;
  padding: 18px 24px 16px;
}

.title {
  margin-right: auto;
}

h1 {
  margin: 0;
  font: 600 26px/1.05 var(--font-semi);
  letter-spacing: -0.01em;
}

.title p {
  margin: 3px 0 0;
  color: var(--ink-2);
}

.modes {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  background: var(--sheet);
}

.modes button {
  padding: 6px 15px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--ink-2);
  font: 600 15px var(--font-semi);
}

.modes button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--sheet);
}

.sound {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink-2);
}

.sound input {
  width: 110px;
  accent-color: var(--ink);
}

.ignition {
  min-width: 138px;
  padding: 10px 20px;
  border: 0;
  border-radius: 999px;
  background: var(--heat);
  color: #fff;
  font: 600 16px var(--font-semi);
  box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.18);
}

.ignition[aria-pressed="true"] {
  background: var(--ink);
}

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

.sheet {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  grid-template-areas:
    "drawing cluster"
    "dyno controls"
    "timing timing"
    "pipes pipes";
  gap: 20px 24px;
  max-width: 1480px;
  margin: 0 auto;
  padding: 0 24px 36px;
}

/* ---------- drawing sheet ---------- */

.drawing {
  grid-area: drawing;
  align-self: start;
  border: 1px solid var(--ink);
  background: var(--sheet);
}

.sound-note {
  margin: 4px 14px 0;
  color: var(--red);
}

.viewport {
  position: relative;
  width: 100%;
  aspect-ratio: 940 / 628;
  max-height: max(340px, calc(100vh - 250px));
}

#engine-canvas,
.engine-3d {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.engine-3d {
  overflow: hidden;
  cursor: grab;
}

.engine-3d:active {
  cursor: grabbing;
}

.engine-3d > canvas {
  display: block;
}

.loading-3d {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  margin: 0;
  color: var(--ink-3);
}

.viewport-tools {
  position: absolute;
  top: 8px;
  right: 10px;
  left: 10px;
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  align-items: center;
  gap: 6px 10px;
  pointer-events: none;
}

.viewport-tools > * {
  pointer-events: auto;
}

.seg {
  display: inline-flex;
  padding: 2px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  background: var(--sheet);
}

.seg button {
  padding: 3px 10px;
  white-space: nowrap;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--ink-2);
  font: 600 13px var(--font-semi);
}

.seg button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--sheet);
}

.seg button:disabled {
  color: var(--ink-3);
  cursor: not-allowed;
}

.tool {
  padding: 4px 11px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  background: var(--sheet);
  font: 600 13px var(--font-semi);
}

/* 3D toolbar: translucent glass pills floating over the render. */
.viewport-tools .seg,
.viewport-tools .tool {
  border: 1px solid rgba(27, 33, 37, 0.1);
  background: rgba(250, 251, 249, 0.58);
  box-shadow: 0 1px 1px rgba(27, 33, 37, 0.04), 0 8px 24px rgba(27, 33, 37, 0.08);
  -webkit-backdrop-filter: blur(18px) saturate(1.8);
  backdrop-filter: blur(18px) saturate(1.8);
}

.viewport-tools .seg {
  position: relative;
  isolation: isolate;
}

.viewport-tools .seg button {
  position: relative;
  z-index: 1;
  padding: 4px 12px;
  letter-spacing: 0.01em;
}

.viewport-tools .seg button[aria-pressed="true"] {
  background: transparent;
  color: var(--ink);
}

.viewport-tools .tool {
  padding: 5px 13px;
  letter-spacing: 0.01em;
}

.viewport-tools button {
  transition: transform 100ms ease-out;
}

.viewport-tools button:active {
  transform: scale(0.97);
}

.seg-thumb {
  position: absolute;
  z-index: 0;
  top: 2px;
  bottom: 2px;
  left: 0;
  border-radius: 999px;
  background: #fff;
  box-shadow: 0 1px 3px rgba(27, 33, 37, 0.14), 0 0 0 0.5px rgba(27, 33, 37, 0.06);
  transition: transform 360ms cubic-bezier(0.32, 0.72, 0, 1), width 360ms cubic-bezier(0.32, 0.72, 0, 1);
}

@media (prefers-reduced-motion: reduce) {
  .seg-thumb,
  .viewport-tools button {
    transition: none;
  }
}

@media (prefers-reduced-transparency: reduce) {
  .viewport-tools .seg,
  .viewport-tools .tool {
    background: var(--sheet);
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }
}

.title-block {
  display: grid;
  grid-template-columns: 1.25fr 1.15fr 0.8fr 1.5fr;
  border-top: 1px solid var(--ink);
}

.title-block > div {
  padding: 8px 12px 10px;
  border-left: 1px solid var(--ink);
}

.title-block > div:first-child {
  border-left: 0;
}

.tb-label {
  display: block;
  margin-bottom: 3px;
  color: var(--ink-3);
  font: 500 12px/1.2 var(--font-semi);
}

.tb-value {
  font: 600 14px/1.3 var(--font-semi);
}

.title-block select {
  padding: 2px 4px;
  border: 1px solid var(--ink);
  border-radius: 4px;
  background: var(--paper);
  font: 600 14px var(--font-semi);
}

.firing {
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.firing li {
  display: grid;
  place-items: center;
  width: 23px;
  height: 23px;
  border: 1px solid var(--ink);
  border-radius: 50%;
  font: 600 12px var(--font-semi);
}

.firing li.on {
  border-color: var(--heat);
  background: var(--heat);
  color: #fff;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 12px;
  font-size: 13px;
}

.swatch {
  display: inline-block;
  width: 16px;
  height: 9px;
  margin-right: 5px;
  border: 1px solid var(--ink);
  vertical-align: 0;
}

.swatch-charge {
  background: var(--charge-light);
}
.swatch-burn {
  background: linear-gradient(90deg, var(--heat-hot), var(--heat));
}
.swatch-exhaust {
  background: var(--rust);
}
.swatch-cut {
  background: repeating-linear-gradient(-45deg, var(--sheet) 0 2px, var(--ink-2) 2px 3px);
}

/* ---------- instrument cluster ---------- */

.cluster {
  grid-area: cluster;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

#tach {
  width: 100%;
  max-width: 310px;
  aspect-ratio: 1;
  align-self: center;
}

.status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 22px;
  margin: 0;
  font: 600 15px/1.2 var(--font-semi);
  text-align: center;
}

.status .dot {
  flex: none;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-3);
}

.status[data-tone="ok"] .dot {
  background: var(--ok);
}
.status[data-tone="hot"] .dot {
  background: var(--charge);
}
.status[data-tone="warn"] .dot {
  background: var(--heat);
}
.status[data-tone="info"] .dot {
  background: var(--charge-light);
}

.secondary {
  display: grid;
  grid-template-columns: 124px minmax(0, 1fr);
  gap: 16px;
  align-items: center;
  padding-top: 12px;
  border-top: 1px solid var(--rule);
}

#boost {
  width: 124px;
  aspect-ratio: 1.7;
}

.readouts {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1px 10px;
  align-items: baseline;
  margin: 0;
}

.readouts dt {
  color: var(--ink-2);
  font-size: 13px;
}

.readouts dd {
  margin: 0;
  text-align: right;
  font: 600 19px/1.25 var(--font-cond);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.readouts small {
  color: var(--ink-3);
  font: 500 12px var(--font);
}

.readouts .alt {
  display: inline-block;
  min-width: 44px;
}

.timers {
  display: none;
  padding-top: 12px;
  border-top: 1px solid var(--rule);
}

body[data-mode="drive"] .timers {
  display: block;
}

.timers h2 {
  font-size: 15px;
}

.timers dl {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin: 8px 0 6px;
}

.timers dt {
  color: var(--ink-2);
  font-size: 13px;
}

.timers dd {
  margin: 0;
  font: 600 22px/1.1 var(--font-cond);
  font-variant-numeric: tabular-nums;
}

.factory {
  margin: 0;
  color: var(--ink-3);
  font-size: 13px;
}

/* ---------- dyno chart ---------- */

.dyno {
  grid-area: dyno;
  padding-top: 12px;
  border-top: 1px solid var(--ink);
}

.dyno-head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin-bottom: 8px;
}

.dyno-head p {
  flex: 1 1 280px;
  margin: 0;
  color: var(--ink-2);
}

.run {
  padding: 6px 14px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  background: var(--ink);
  color: var(--sheet);
  font: 600 14px var(--font-semi);
}

.run:disabled {
  border-color: var(--rule);
  background: transparent;
  color: var(--ink-3);
  cursor: default;
}

body:not([data-mode="dyno"]) .run {
  display: none;
}

#dyno-canvas {
  width: 100%;
  height: 270px;
}

.chart-key {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  margin: 6px 0 0;
  color: var(--ink-2);
  font-size: 13px;
}

.line {
  display: inline-block;
  width: 22px;
  height: 0;
  margin-right: 6px;
  vertical-align: middle;
  border-top: 2.5px solid;
}

.line-torque {
  border-color: var(--heat);
}
.line-power {
  border-color: var(--charge);
}
.line-factory {
  border-top: 1.5px dashed var(--ink-2);
}

/* ---------- controls ---------- */

.controls {
  grid-area: controls;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  padding-top: 12px;
  border-top: 1px solid var(--ink);
}

.pedals {
  display: grid;
  gap: 8px;
  width: 78px;
}

.pedal {
  position: relative;
  height: 168px;
  overflow: hidden;
  border: 1px solid var(--ink);
  border-radius: 10px;
  background: repeating-linear-gradient(0deg, transparent 0 9px, rgba(27, 33, 37, 0.09) 9px 10px), var(--sheet);
  cursor: ns-resize;
  touch-action: none;
  user-select: none;
}

.pedal-fill {
  position: absolute;
  inset: auto 0 0 0;
  height: 0;
  background: var(--heat);
}

.pedal-label {
  position: absolute;
  inset: auto 0 8px 0;
  color: var(--ink);
  font: 600 13px var(--font-semi);
  text-align: center;
}

.brake {
  padding: 9px 0;
  border: 1px solid var(--ink);
  border-radius: 10px;
  background: var(--sheet);
  font: 600 14px var(--font-semi);
  touch-action: none;
  user-select: none;
}

.brake:active {
  background: var(--ink);
  color: var(--sheet);
}

body[data-mode="free"] .brake,
body[data-mode="free"] .paddles {
  opacity: 0.4;
  pointer-events: none;
}

.paddles {
  display: grid;
  grid-template-columns: 44px 1fr 44px;
  gap: 6px;
  margin-bottom: 12px;
}

.paddles button {
  padding: 8px 0;
  border: 1px solid var(--ink);
  border-radius: 8px;
  background: var(--sheet);
  font: 600 15px var(--font-semi);
}

#shift-down,
#shift-up {
  font-size: 20px;
  line-height: 1;
}

.keys {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.keys caption {
  margin-bottom: 4px;
  color: var(--ink-3);
  font: 500 12px var(--font-semi);
  text-align: left;
}

.keys th,
.keys td {
  padding: 3px 0;
  border-top: 1px solid var(--rule);
  text-align: left;
  vertical-align: middle;
}

.keys th {
  width: 82px;
  font-weight: 400;
  white-space: nowrap;
}

.keys td {
  color: var(--ink-2);
}

.device {
  grid-column: 1 / -1;
  display: grid;
  gap: 8px;
  padding-top: 12px;
  border-top: 1px solid var(--rule);
}

.device h2 {
  font-size: 15px;
}

.device-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
}

.device-label {
  width: 52px;
  color: var(--ink-3);
  font: 500 12px var(--font-semi);
}

.device-status {
  min-height: 1.2em;
  margin: 0;
  color: var(--ink-2);
  font-size: 13px;
}

.device-status[data-tone="warn"] {
  color: var(--red);
}

/* ---------- pulse timing and pipe designer ---------- */

.timing,
.pipes {
  padding-top: 12px;
  border-top: 1px solid var(--ink);
}

.timing {
  grid-area: timing;
}

.pipes {
  grid-area: pipes;
}

.panel-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  margin-bottom: 10px;
}

.panel-head h2 {
  margin-right: auto;
}

.tool:disabled {
  border-color: var(--rule);
  color: var(--ink-3);
  cursor: default;
}

.tool.recording {
  border-color: var(--red);
  background: var(--red);
  color: #fff;
}

.record-status {
  color: var(--ink-2);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

#timing-canvas {
  width: 100%;
  height: 230px;
}

.timing-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px 16px;
  margin: 10px 0 0;
}

.timing-stats dt {
  color: var(--ink-2);
  font-size: 13px;
}

.timing-stats dd {
  margin: 0;
  font: 600 19px/1.2 var(--font-cond);
  font-variant-numeric: tabular-nums;
}

.check {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font: 600 13px var(--font-semi);
  cursor: pointer;
}

.check input {
  margin: 0;
  accent-color: var(--ink);
}

.pipes-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.pipe-fields {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 18px;
  margin-bottom: 10px;
}

.pipe-fields label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--ink-2);
  font-size: 13px;
}

.pipe-fields input,
.pipe-table input {
  width: 74px;
  padding: 3px 6px;
  border: 1px solid var(--rule);
  border-radius: 5px;
  background: var(--sheet);
  font: 500 14px var(--font);
  font-variant-numeric: tabular-nums;
}

.pipe-sound-speed {
  color: var(--ink-3);
  font-size: 13px;
}

.pipe-table {
  width: 100%;
  margin-bottom: 12px;
  border-collapse: collapse;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

.pipe-table th {
  padding: 4px 6px;
  border-bottom: 1px solid var(--rule);
  color: var(--ink-3);
  font: 500 12px var(--font-semi);
  text-align: left;
}

.pipe-table td,
.pipe-table tbody th {
  padding: 3px 6px;
  border-bottom: 1px solid var(--rule);
  font-weight: 500;
}

.pipe-table .warn {
  color: var(--heat);
}

#pipe-canvas {
  width: 100%;
  height: 330px;
}

@media (max-width: 1000px) {
  .pipes-body {
    grid-template-columns: minmax(0, 1fr);
  }

  .timing-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

kbd {
  display: inline-block;
  min-width: 20px;
  padding: 0 4px;
  border: 1px solid var(--ink-3);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: var(--sheet);
  font: 600 12px/18px var(--font-semi);
  text-align: center;
}

/* ---------- narrow screens ---------- */

@media (max-width: 1000px) {
  .sheet {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "drawing"
      "cluster"
      "controls"
      "dyno"
      "timing"
      "pipes";
    padding: 0 16px 28px;
  }

  .masthead {
    padding: 14px 16px;
  }

  .cluster {
    display: grid;
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
    gap: 12px 24px;
    align-items: start;
  }

  #tach {
    grid-row: span 3;
  }

  .secondary {
    border-top: 0;
    padding-top: 0;
  }
}

@media (max-width: 640px) {
  h1 {
    font-size: 22px;
  }

  .masthead {
    gap: 10px 14px;
  }

  .modes {
    order: 3;
  }

  .sound {
    order: 4;
  }

  .ignition {
    order: 2;
  }

  .title-block {
    grid-template-columns: 1fr 1fr;
  }

  .title-block > div:nth-child(3) {
    border-left: 0;
  }

  .title-block > div:nth-child(n + 3) {
    border-top: 1px solid var(--ink);
  }

  .cluster {
    display: flex;
    align-items: stretch;
  }

  #tach {
    max-width: 280px;
  }

  .secondary {
    padding-top: 12px;
    border-top: 1px solid var(--rule);
  }

  #dyno-canvas {
    height: 220px;
  }
}