:root {
  --bg: #090d0c;
  --panel: rgba(13, 19, 17, 0.88);
  --panel-solid: #0f1614;
  --panel-soft: rgba(20, 29, 26, 0.82);
  --line: rgba(225, 236, 229, 0.11);
  --line-hot: rgba(183, 243, 75, 0.42);
  --ink: #edf2ee;
  --ink-2: #bcc7c0;
  --ink-3: #7f8d86;
  --ink-4: #53605a;
  --acid: #b7f34b;
  --brake: #ff5b4b;
  --release: #ffad55;
  --throttle: #61e8c7;
  --danger: #ff5b68;
  --serif: "Fraunces", Georgia, serif;
  --sans: "Schibsted Grotesk", Arial, sans-serif;
  --mono: "IBM Plex Mono", monospace;
}

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

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

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--acid);
  outline-offset: 3px;
}

#track {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
}

#app {
  position: fixed;
  inset: 0;
  pointer-events: none;
}

#topbar,
#lesson,
#telemetry,
#coach,
#dock {
  pointer-events: auto;
}

#topbar {
  position: absolute;
  z-index: 12;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 18px 0 22px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(7, 11, 10, 0.97), rgba(7, 11, 10, 0.75));
  backdrop-filter: blur(16px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
}

.brand-mark {
  display: grid;
  width: 29px;
  height: 29px;
  place-items: center;
  border: 1px solid var(--line-hot);
  border-radius: 7px;
  color: var(--acid);
  font: 500 12px var(--mono);
  transform: skewX(-8deg);
}

.brand-name {
  font: 500 14px var(--mono);
  letter-spacing: 0.15em;
}

.brand-thesis {
  margin-left: 6px;
  color: var(--ink-3);
  font: italic 13px var(--serif);
}

.assist-bank {
  display: flex;
  align-items: center;
  gap: 7px;
}

.assist-bank-label {
  margin-right: 3px;
  color: var(--ink-4);
  font: 500 9px var(--mono);
  letter-spacing: 0.14em;
}

.assist-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 102px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: rgba(255, 255, 255, 0.025);
  cursor: pointer;
  text-align: left;
}

.assist-toggle > i {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--ink-4);
  box-shadow: 0 0 0 transparent;
}

.assist-toggle span {
  display: grid;
}

.assist-toggle strong {
  font: 500 10px var(--mono);
  letter-spacing: 0.08em;
}

.assist-toggle small {
  color: var(--ink-3);
  font: 9px var(--sans);
}

.assist-toggle.on {
  border-color: rgba(183, 243, 75, 0.24);
}

.assist-toggle.on > i {
  background: var(--acid);
  box-shadow: 0 0 10px rgba(183, 243, 75, 0.64);
}

.assist-toggle:disabled {
  cursor: not-allowed;
  opacity: 0.72;
}

#lesson {
  position: absolute;
  z-index: 8;
  top: 78px;
  bottom: 160px;
  left: 16px;
  width: 318px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: 0 22px 70px rgba(0, 0, 0, 0.24);
  backdrop-filter: blur(18px);
}

.lesson-scroll {
  height: 100%;
  overflow-y: auto;
  padding: 19px 20px 24px;
  scrollbar-color: rgba(255, 255, 255, 0.16) transparent;
  scrollbar-width: thin;
}

#lessonToggle {
  display: none;
  position: absolute;
  z-index: 2;
  top: 8px;
  right: 8px;
  padding: 5px 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel-solid);
  color: var(--ink-3);
  font: 500 8px var(--mono);
  letter-spacing: 0.1em;
  cursor: pointer;
}

.chapter-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  color: var(--acid);
  font: 500 9px var(--mono);
  letter-spacing: 0.13em;
}

#chapterTag {
  color: var(--ink-4);
  text-align: right;
}

#chapterTitle {
  max-width: 280px;
  margin: 11px 0 10px;
  font-family: var(--serif);
  font-size: 37px;
  font-weight: 430;
  letter-spacing: -0.025em;
  line-height: 0.98;
  text-wrap: balance;
}

.kicker {
  margin-bottom: 14px;
  padding-left: 11px;
  border-left: 2px solid var(--acid);
  color: var(--ink-2);
  font: italic 15px/1.38 var(--serif);
}

#chapterBody {
  display: grid;
  gap: 11px;
}

#chapterBody p {
  color: var(--ink-3);
  font-size: 12.5px;
  line-height: 1.53;
}

#chapterBody strong {
  color: var(--ink);
  font-weight: 600;
}

.rule-card {
  display: grid;
  gap: 9px;
  margin-top: 2px;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.025);
}

.rule-card .label,
.assist-note .label,
.shape-title {
  color: var(--ink-4);
  font: 500 8.5px var(--mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.rule-card b {
  font: 500 13px/1.35 var(--mono);
}

.rule-card.brake b {
  color: var(--release);
}

.rule-card.throttle b {
  color: var(--throttle);
}

.shape {
  display: grid;
  gap: 7px;
  padding-top: 3px;
}

.shape-row {
  display: grid;
  grid-template-columns: 58px 1fr 38px;
  align-items: center;
  gap: 8px;
}

.shape-row > span {
  color: var(--ink-3);
  font: 9px var(--mono);
}

.shape-row > em {
  color: var(--ink-2);
  font: normal 9px var(--mono);
  text-align: right;
}

.shape-bar {
  position: relative;
  height: 5px;
  overflow: hidden;
  border-radius: 99px;
  background: rgba(255, 255, 255, 0.07);
}

.shape-bar i {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  transform-origin: left;
}

.shape-bar.brake i {
  background: linear-gradient(90deg, var(--brake), var(--release), transparent);
}

.shape-bar.throttle i {
  background: linear-gradient(90deg, transparent, var(--throttle), var(--acid));
}

.phase-strip {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 3px;
  margin: 4px 0 2px;
}

.phase-strip span {
  display: grid;
  min-height: 31px;
  place-items: center;
  padding: 4px 2px;
  border: 1px solid var(--line);
  border-radius: 5px;
  color: var(--ink-4);
  font: 7px/1.2 var(--mono);
  text-align: center;
  text-transform: uppercase;
}

.phase-strip span:nth-child(2) {
  border-color: rgba(255, 91, 75, 0.3);
  color: var(--brake);
}

.phase-strip span:nth-child(3) {
  border-color: rgba(255, 173, 85, 0.3);
  color: var(--release);
}

.phase-strip span:nth-child(4),
.phase-strip span:nth-child(5) {
  border-color: rgba(97, 232, 199, 0.25);
  color: var(--throttle);
}

.assist-note {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 10px;
  align-items: start;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: rgba(183, 243, 75, 0.035);
}

.assist-note .badge {
  display: grid;
  width: 34px;
  height: 28px;
  place-items: center;
  border: 1px solid rgba(183, 243, 75, 0.3);
  border-radius: 6px;
  color: var(--acid);
  font: 500 9px var(--mono);
}

.assist-note p {
  margin-top: 3px;
  font-size: 11px !important;
}

.correction {
  padding: 9px 11px;
  border-left: 2px solid var(--acid);
  background: rgba(183, 243, 75, 0.04);
  color: var(--ink-2) !important;
}

#result {
  margin-top: 14px;
  padding: 12px;
  border: 1px solid var(--line-hot);
  border-radius: 11px;
  background: rgba(183, 243, 75, 0.045);
}

#result[hidden] {
  display: none;
}

.result-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 10px;
}

.result-head span {
  color: var(--acid);
  font: 500 10px var(--mono);
  letter-spacing: 0.13em;
}

.result-head strong {
  font: 500 28px var(--mono);
}

.result-scores {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 7px;
  margin-bottom: 9px;
}

.result-scores div {
  padding: 7px;
  border: 1px solid var(--line);
  border-radius: 7px;
}

.result-scores span {
  display: block;
  color: var(--ink-4);
  font: 8px var(--mono);
}

.result-scores strong {
  font: 500 16px var(--mono);
}

.result-feedback {
  color: var(--ink-2);
  font-size: 11.5px;
  line-height: 1.45;
}

#telemetry {
  position: absolute;
  z-index: 8;
  top: 78px;
  right: 16px;
  width: 260px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: var(--panel);
  backdrop-filter: blur(18px);
}

.telemetry-head {
  display: flex;
  justify-content: space-between;
  padding: 9px 11px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-4);
  font: 500 8px var(--mono);
  letter-spacing: 0.12em;
}

#runMode {
  color: var(--acid);
}

.telemetry-primary {
  display: grid;
  grid-template-columns: 0.88fr 1.12fr;
  border-bottom: 1px solid var(--line);
}

.telemetry-primary > div {
  min-height: 72px;
  padding: 9px 11px;
}

.telemetry-primary > div + div {
  border-left: 1px solid var(--line);
}

.telemetry-label {
  display: block;
  margin-bottom: 3px;
  color: var(--ink-4);
  font: 8px var(--mono);
  letter-spacing: 0.1em;
}

#speedReadout {
  font: 500 28px/1 var(--mono);
}

.telemetry-primary small {
  color: var(--ink-4);
  font: 8px var(--mono);
}

#phaseReadout {
  display: block;
  overflow: hidden;
  color: var(--ink);
  font: 500 13px/1.25 var(--mono);
  text-overflow: ellipsis;
  white-space: nowrap;
}

#phaseInstruction {
  color: var(--ink-3);
}

.assist-lamps {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid var(--line);
}

.assist-lamps > div {
  display: grid;
  grid-template-columns: 7px 1fr auto;
  gap: 6px;
  align-items: center;
  padding: 7px 9px;
}

.assist-lamps > div + div {
  border-left: 1px solid var(--line);
}

.assist-lamps i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ink-4);
}

.assist-lamps span,
.assist-lamps strong {
  font: 500 8px var(--mono);
}

.assist-lamps strong {
  color: var(--ink-4);
  font-size: 7px;
}

.assist-lamps .active i {
  background: var(--release);
  box-shadow: 0 0 9px var(--release);
}

.assist-lamps .active strong {
  color: var(--release);
}

#tcLamp.active i {
  background: var(--throttle);
  box-shadow: 0 0 9px var(--throttle);
}

#tcLamp.active strong {
  color: var(--throttle);
}

.trace-block {
  padding: 9px 9px 5px;
  border-bottom: 1px solid var(--line);
}

.chart-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--ink-4);
  font: 500 8px var(--mono);
  letter-spacing: 0.1em;
}

.chart-legend {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 7px;
  letter-spacing: 0;
}

.chart-legend i {
  width: 9px;
  height: 2px;
  margin-left: 4px;
}

.chart-legend .brake {
  background: var(--brake);
}

.chart-legend .throttle {
  background: var(--acid);
}

#trace {
  display: block;
  width: 100%;
  height: 104px;
  margin-top: 5px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 5px;
}

.trace-key {
  display: flex;
  justify-content: space-between;
  padding: 4px 2px 0;
  color: var(--ink-4);
  font: 7px var(--mono);
}

.grip-block {
  display: grid;
  grid-template-columns: 1fr 78px;
  gap: 8px;
  align-items: center;
  padding: 8px 9px;
}

.grip-block p {
  margin-top: 4px;
  color: var(--ink-4);
  font-size: 9px;
  line-height: 1.4;
}

#grip {
  width: 76px;
  height: 76px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 50%;
}

#coach {
  position: absolute;
  z-index: 10;
  left: 50%;
  bottom: 149px;
  display: flex;
  max-width: min(590px, calc(100vw - 650px));
  align-items: center;
  gap: 9px;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(9, 14, 12, 0.9);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.28);
  color: var(--ink-2);
  font-size: 11px;
  line-height: 1.35;
  transform: translateX(-50%);
  backdrop-filter: blur(14px);
}

#coachText {
  min-width: 0;
}

.coach-label {
  color: var(--acid);
  font: 500 8px var(--mono);
  letter-spacing: 0.12em;
}

#dock {
  position: absolute;
  z-index: 11;
  right: 0;
  bottom: 0;
  left: 0;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  grid-template-rows: 91px 37px;
  gap: 0 14px;
  align-items: center;
  padding: 8px 14px 7px;
  border-top: 1px solid var(--line);
  background: linear-gradient(0deg, rgba(7, 11, 10, 0.99), rgba(9, 14, 12, 0.94));
  backdrop-filter: blur(18px);
}

#driveControls {
  display: flex;
  grid-column: 1;
  grid-row: 1;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
}

.pedal {
  width: min(190px, 15vw);
  min-width: 128px;
}

.pedal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
  color: var(--ink-3);
  font: 500 9px var(--mono);
  letter-spacing: 0.08em;
}

.pedal-head output {
  color: var(--ink);
  font-size: 10px;
}

kbd {
  padding: 1px 4px;
  border: 1px solid var(--line);
  border-bottom-color: rgba(255, 255, 255, 0.22);
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.035);
  color: var(--ink-3);
  font: 8px var(--mono);
}

.pedal input {
  width: 100%;
  height: 18px;
  cursor: ew-resize;
}

.brake-pedal input {
  accent-color: var(--brake);
}

.throttle-pedal input {
  accent-color: var(--acid);
}

.pedal-target {
  position: relative;
  height: 10px;
  margin: 0 7px;
  color: var(--ink-4);
  font: 7px var(--mono);
}

.pedal-target i {
  position: absolute;
  top: 1px;
  left: 0;
  width: 1px;
  height: 7px;
  background: var(--ink-2);
  transition: left 0.08s linear;
}

.pedal-target span {
  position: absolute;
  right: 0;
  opacity: 0.7;
}

.handoff {
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--ink-4);
  font: 7px var(--mono);
}

.handoff i {
  color: var(--acid);
  font-style: normal;
}

#actionControls {
  display: flex;
  grid-column: 2;
  grid-row: 1;
  align-items: center;
  justify-content: center;
  gap: 7px;
}

.action {
  min-height: 39px;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: rgba(255, 255, 255, 0.035);
  color: var(--ink-2);
  font: 500 9px var(--mono);
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, color 0.15s, transform 0.15s;
}

.action:hover {
  border-color: rgba(255, 255, 255, 0.25);
  color: var(--ink);
  transform: translateY(-1px);
}

.action:disabled {
  cursor: default;
  opacity: 0.45;
  transform: none;
}

.action.primary {
  border-color: var(--acid);
  background: var(--acid);
  color: #10160c;
  box-shadow: 0 5px 20px rgba(183, 243, 75, 0.18);
}

.action.compare.active {
  border-color: var(--acid);
  color: var(--acid);
}

#compareControls {
  display: flex;
  gap: 6px;
}

#compareControls[hidden] {
  display: none;
}

#chapterNav {
  display: flex;
  grid-column: 1 / -1;
  grid-row: 2;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

#chapterNav button {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: transparent;
  color: var(--ink-4);
  font: 500 8px var(--mono);
  cursor: pointer;
}

#chapterNav button i {
  font-style: normal;
}

#chapterNav button span {
  color: inherit;
}

#chapterNav button.active {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.035);
  color: var(--ink);
}

#chapterNav button.active i {
  color: var(--acid);
}

#portraitHint {
  display: none;
}

#app[data-manual="false"] .pedal input {
  pointer-events: none;
  opacity: 0.56;
}

#app[data-manual="false"] .pedal-target {
  opacity: 0.46;
}

#app[data-chapter="shape"] #driveControls,
#app[data-chapter="assists"] #driveControls {
  opacity: 0.5;
}

#app[data-chapter="assists"] #demoButton,
#app[data-chapter="assists"] #practiceButton {
  display: none;
}

@media (max-width: 1080px) {
  #lesson {
    width: 224px;
  }

  #chapterTitle {
    font-size: 29px;
  }

  .lesson-scroll {
    padding: 16px;
  }

  #telemetry {
    top: auto;
    right: 10px;
    bottom: 146px;
    width: 236px;
  }

  .trace-block,
  .grip-block {
    display: none;
  }

  #coach {
    max-width: calc(100vw - 500px);
  }

  .handoff {
    display: none;
  }

  #dock {
    grid-template-columns: 1fr auto;
  }
}

@media (max-width: 760px) {
  #topbar {
    height: 57px;
    padding: 0 9px 0 11px;
  }

  .brand-mark {
    width: 26px;
    height: 26px;
  }

  .brand-name {
    font-size: 11px;
  }

  .brand-thesis,
  .assist-bank-label,
  .assist-toggle small {
    display: none;
  }

  .assist-bank {
    position: absolute;
    right: 8px;
    gap: 5px;
  }

  .assist-toggle {
    width: 43px;
    min-width: 43px;
    gap: 5px;
    justify-content: center;
    padding: 6px 5px;
  }

  .assist-toggle span {
    display: block;
  }

  .assist-toggle strong {
    font-size: 8px;
  }

  #lesson {
    top: 66px;
    right: 8px;
    bottom: auto;
    left: 8px;
    width: auto;
    max-height: 205px;
  }

  #lessonToggle {
    display: block;
  }

  #lesson.collapsed {
    width: 72px;
    height: 34px;
    border-color: transparent;
    background: transparent;
    backdrop-filter: none;
  }

  #lesson.collapsed .lesson-scroll {
    display: none;
  }

  .lesson-scroll {
    height: auto;
    max-height: 203px;
    padding: 14px 15px 16px;
  }

  #chapterTitle {
    max-width: calc(100% - 64px);
    margin: 8px 0 7px;
    font-size: 25px;
  }

  .kicker {
    margin-bottom: 10px;
    font-size: 13px;
  }

  #chapterBody p {
    font-size: 11.5px;
  }

  .rule-card,
  .assist-note,
  .phase-strip,
  .shape {
    display: none;
  }

  #telemetry {
    display: none;
    top: 66px;
    right: 8px;
    bottom: auto;
    width: 154px;
    border-radius: 10px;
    pointer-events: none;
  }

  #lesson.collapsed ~ #telemetry {
    display: block;
  }

  .telemetry-head,
  .assist-lamps,
  .trace-block,
  .grip-block {
    display: none;
  }

  .telemetry-primary {
    grid-template-columns: 0.84fr 1.16fr;
  }

  .telemetry-primary > div {
    min-height: 50px;
    padding: 6px 7px;
  }

  #speedReadout {
    font-size: 19px;
  }

  #phaseReadout {
    font-size: 9px;
  }

  #coach {
    right: 8px;
    bottom: 159px;
    left: 8px;
    max-width: none;
    justify-content: center;
    padding: 7px 10px;
    border-radius: 8px;
    font-size: 10px;
    line-height: 1.25;
    text-align: center;
    transform: none;
  }

  #dock {
    grid-template-columns: 1fr;
    grid-template-rows: 66px 36px 31px;
    gap: 2px;
    padding: 5px 7px calc(5px + env(safe-area-inset-bottom, 0px));
  }

  #driveControls {
    grid-column: 1;
    grid-row: 1;
    justify-content: center;
    gap: 15px;
  }

  .pedal {
    width: min(42vw, 180px);
    min-width: 0;
  }

  .pedal-head {
    margin-bottom: 1px;
  }

  .pedal-target {
    height: 7px;
  }

  #actionControls {
    grid-column: 1;
    grid-row: 2;
  }

  .action {
    min-height: 31px;
    padding: 5px 10px;
    font-size: 8px;
  }

  #chapterNav {
    grid-column: 1;
    grid-row: 3;
    gap: 2px;
  }

  #chapterNav button {
    padding: 4px 8px;
  }

  #chapterNav button span {
    display: none;
  }

  #result {
    margin-top: 9px;
  }

  @media (orientation: portrait) {
    #portraitHint {
      position: fixed;
      z-index: 20;
      top: 123px;
      left: 50%;
      display: block;
      padding: 5px 9px;
      border: 1px solid var(--line);
      border-radius: 999px;
      background: var(--panel);
      color: var(--ink-3);
      font: 8px var(--mono);
      letter-spacing: 0.08em;
      transform: translateX(-50%);
      animation: hint-fade 6s forwards;
      pointer-events: none;
    }
  }
}

@keyframes hint-fade {
  0%,
  100% {
    opacity: 0;
  }
  10%,
  72% {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}