:root {
  color-scheme: dark;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #11161f;
  color: #edf2ff;
  accent-color: #78c2ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.app-shell {
  width: min(100%, 980px);
  display: grid;
  gap: 24px;
}

header h1 {
  margin: 0 0 8px;
  font-size: clamp(2rem, 3vw, 3rem);
}

header p {
  margin: 0;
  color: #b8c7ff;
}

.controls {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.control-card,
.speedometer-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 22px;
  padding: 22px;
  box-shadow: 0 24px 50px rgba(0, 0, 0, 0.24);
}

.control-card label,
.control-card p,
.details h2 {
  display: block;
  margin-bottom: 12px;
  font-weight: 600;
}

.rpm-display {
  font-size: 1.4rem;
  margin-bottom: 12px;
  color: #f8fbff;
}

input[type="range"] {
  width: 100%;
  accent-color: #78c2ff;
}

.power-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 18px 0 14px;
}

.power-card {
  padding: 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
}

.power-title {
  display: block;
  margin-bottom: 8px;
  color: #c4d0ff;
  font-size: 0.95rem;
  font-weight: 600;
}

.power-card strong {
  display: block;
  font-size: 2rem;
  line-height: 1;
}

.power-unit {
  display: block;
  color: #9bb3ff;
  margin-top: 6px;
}

.power-curve-card {
  padding: 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.power-curve-label {
  color: #c4d0ff;
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.power-curve-legend {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 10px;
  color: #b2c0ff;
  font-size: 0.9rem;
}

.curve-key {
  width: 12px;
  height: 12px;
  border-radius: 4px;
  display: inline-block;
  margin-right: 4px;
}

.hp-key {
  background: #78c2ff;
}

.tq-key {
  background: #ffb86c;
}

.power-curve-graph {
  width: 100%;
  height: 130px;
  overflow: visible;
}

.power-curve-graph path {
  stroke-linecap: round;
}

.power-curve-graph circle {
  transition: transform 0.15s ease;
}

.hgate-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(72px, 1fr));
  grid-template-rows: minmax(72px, auto) minmax(72px, auto) 1fr;
  gap: 10px;
  justify-items: center;
  align-items: center;
  width: min(100%, 360px);
  margin: 0 auto;
}

.gate-slot {
  display: grid;
  place-items: center;
  width: 68px;
  height: 68px;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.12);
  color: #edf2ff;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.2s ease, border-color 0.2s ease;
  pointer-events: auto;
}

.gate-slot:hover {
  transform: translateY(-2px);
  background: rgba(120, 194, 255, 0.18);
}

.gate-slot.selected {
  background: #78c2ff;
  color: #0b1726;
  border-color: #78c2ff;
  box-shadow: 0 12px 24px rgba(120, 194, 255, 0.25);
}

.gate-slot.reverse {
  grid-column: 1 / span 3;
  width: auto;
  max-width: 180px;
  border-radius: 24px;
}

.gate-slot:hover {
  background: rgba(120, 194, 255, 0.16);
  transform: translateY(-1px);
}

.gate-slot.selected {
  background: #78c2ff;
  color: #0b1726;
  border-color: #78c2ff;
  box-shadow: 0 14px 28px rgba(120, 194, 255, 0.25);
}

.empty-slot {
  background: transparent;
}

.gear-stats {
  margin-top: 16px;
  color: #d0d9ff;
}

.speedometer {
  display: grid;
  gap: 18px;
  align-items: center;
}

.gauge {
  position: relative;
  width: min(320px, 100%);
  aspect-ratio: 1 / 1;
  margin: 0 auto;
}

.gauge-face {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 35%, rgba(255, 255, 255, 0.12), transparent 36%),
    radial-gradient(circle at 50% 50%, #16203e 42%, #0e1524 100%);
  border: 6px solid rgba(255, 255, 255, 0.12);
}

.needle {
  position: absolute;
  left: 50%;
  bottom: 50%;
  width: 4px;
  height: 48%;
  background: linear-gradient(180deg, #78c2ff, #2e8bff);
  transform-origin: bottom center;
  transform: rotate(-90deg);
  border-radius: 999px;
  box-shadow: 0 0 24px rgba(120, 194, 255, 0.45);
}

.gauge-center {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 24px;
  height: 24px;
  background: #e9f5ff;
  border-radius: 50%;
  border: 4px solid rgba(8, 16, 31, 0.8);
  z-index: 1;
}

.gauge-labels {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.gauge-label {
  position: absolute;
  color: #a0b0d4;
  font-size: 0.94rem;
  font-weight: 600;
  white-space: nowrap;
}

.label-0 {
  left: 18%;
  top: 56%;
  transform: translate(-50%, -50%);
}

.label-40 {
  left: calc(28% - 10px);
  top: 26%;
  transform: translate(-50%, -50%);
}

.label-80 {
  left: 50%;
  top: 16%;
  transform: translate(-50%, -50%);
}

.label-120 {
  left: calc(68% + 24px);
  top: calc(36% - 30px);
  transform: translate(-50%, -50%);
}

.label-160 {
  left: calc(82% + 6px);
  top: calc(56% - 16px);
  transform: translate(-50%, -50%);
}

.speed-readout {
  text-align: center;
}

.speed-readout p {
  margin: 0 0 8px;
  color: #a8b8e9;
}

.speed-values {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-size: clamp(2.5rem, 4vw, 4rem);
  font-weight: 700;
}

.metric {
  margin-top: 8px;
  color: #bcc7e8;
}

.details ul {
  margin: 0;
  padding-left: 18px;
  color: #cfd8f9;
}

.details li {
  margin-bottom: 8px;
}

@media (max-width: 640px) {
  body {
    padding: 16px;
  }
}