:root {
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #090b0f;
  color: #f4f5f7;

  --background: #090b0f;
  --surface: #11151b;
  --surface-raised: #171d25;
  --surface-input: #0d1117;
  --line: #29313d;
  --line-strong: #465666;
  --text: #f4f5f7;
  --muted: #a8b1be;
  --accent: #8ed8ff;
  --accent-strong: #c4ebff;
  --danger: #ff9b9b;
  --danger-surface: rgb(117 32 42 / 20%);
  --page-width: 1380px;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--background);
}

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 82% 4%, rgb(41 93 122 / 24%), transparent 34rem),
    var(--background);
  color: var(--text);
  font-size: 1rem;
  line-height: 1.5;
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}

.page-shell,
.site-footer {
  width: min(calc(100% - 40px), var(--page-width));
  margin-inline: auto;
}

.page-shell {
  padding-block: clamp(40px, 7vw, 88px) 72px;
}

.page-header {
  max-width: 760px;
  margin-bottom: clamp(48px, 7vw, 80px);
}

.eyebrow,
.vehicle-card__number {
  margin-bottom: 10px;
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

h1 {
  max-width: 12ch;
  margin-bottom: 22px;
  overflow-wrap: break-word;
  font-size: clamp(1.4rem, 3.5vw, 2.4rem);
  line-height: 0.94;
  letter-spacing: -0.06em;
}

.page-intro {
  max-width: 58ch;
  margin-bottom: 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.25rem);
}

.section-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.export-status {
  min-height: 1.2em;
  margin-right: 4px;
  color: var(--muted);
  font-size: 0.8rem;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(1.4rem, 3.5vw, 2.4rem);
  line-height: 0.94;
  letter-spacing: -0.06em;
}

.button {
  min-height: 44px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 9px 18px;
  background: transparent;
  cursor: pointer;
  font-weight: 750;
  transition: border-color 160ms ease, background 160ms ease, color 160ms ease, transform 160ms ease;
}

.button:hover:not(:disabled) {
  transform: translateY(-1px);
}

.button:focus-visible,
.field__control:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.button--primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #071117;
}

.button--primary:hover {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
}

.button--remove {
  color: var(--muted);
  font-size: 0.88rem;
}

.button--remove:hover:not(:disabled) {
  border-color: var(--danger);
  color: var(--danger);
}

.button--remove:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.vehicle-list {
  display: grid;
  width: 100%;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.vehicle-card {
  width: 100%;
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: clamp(16px, 2.4vw, 26px);
  background: rgb(17 21 27 / 94%);
  box-shadow: 0 24px 70px rgb(0 0 0 / 16%);
}

.vehicle-card__header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 16px;
  border-bottom: 1px solid color-mix(in srgb, var(--vehicle-color) 42%, var(--line));
  border-radius: 12px;
  padding: 10px 12px 13px;
  background: linear-gradient(90deg, var(--vehicle-color-soft), transparent 78%);
}

.vehicle-card__number {
  margin-bottom: 4px;
}

.vehicle-card__title {
  max-width: 22ch;
  margin-bottom: 0;
  overflow-wrap: anywhere;
  font-size: clamp(1.3rem, 2vw, 1.7rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.input-sections {
  display: grid;
  gap: 13px;
  margin-top: 15px;
}

.input-group {
  min-width: 0;
  margin: 0;
  border: 0;
  padding: 0;
}

.input-group legend {
  width: 100%;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 5px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px 12px;
}

.field {
  min-width: 0;
}

.field--wide {
  max-width: 520px;
}

.field-help {
  align-self: end;
  margin: 0;
  border-left: 2px solid var(--line-strong);
  padding: 7px 10px;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.35;
}

.field__label {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 3px;
  font-size: 0.9rem;
  font-weight: 700;
}

.field__label span {
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 500;
}

.field__control {
  width: 100%;
  min-height: 40px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  padding: 7px 10px;
  background: var(--surface-input);
  color: var(--text);
  transition: border-color 160ms ease, background 160ms ease;
}

.field__control:hover {
  border-color: #627589;
}

.field.is-invalid .field__control {
  border-color: var(--danger);
  background: var(--danger-surface);
}

.field__error {
  margin: 3px 0 0;
  color: var(--danger);
  font-size: 0.76rem;
  line-height: 1.25;
}

.field__error:empty {
  display: none;
}

.results {
  margin-top: 19px;
  border-radius: 16px;
  padding: 15px;
  background: var(--surface-raised);
}

.results__heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.results__heading h4 {
  margin-bottom: 0;
  font-size: 1rem;
}

.results__status {
  margin-bottom: 0;
  color: var(--danger);
  font-size: 0.78rem;
  text-align: right;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--line);
}

.result {
  min-width: 0;
  padding: 13px 14px;
  background: var(--surface);
}

.result dt {
  margin-bottom: 5px;
  color: var(--muted);
  font-size: 0.75rem;
}

.result dd {
  margin: 0;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.result--featured dd {
  color: var(--accent-strong);
  font-size: 1.2rem;
}

.chart-panel {
  margin-top: clamp(52px, 8vw, 96px);
}

.chart-panel__heading {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(280px, 1.2fr);
  align-items: end;
  gap: 40px;
  margin-bottom: 24px;
}

.chart-panel__heading .eyebrow {
  margin-bottom: 5px;
}

.chart-panel__intro {
  max-width: 60ch;
  margin: 0 0 2px auto;
  color: var(--muted);
}

.chart-frame {
  position: relative;
  min-height: clamp(360px, 55vw, 520px);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 22px;
  background:
    linear-gradient(rgb(17 21 27 / 88%), rgb(17 21 27 / 96%)),
    radial-gradient(circle at 85% 8%, rgb(142 216 255 / 12%), transparent 26rem);
}

.cost-chart {
  display: block;
  width: 100%;
  height: clamp(360px, 55vw, 520px);
  font-family: inherit;
}

.chart-grid-line {
  stroke: #27313d;
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}

.chart-axis-line {
  stroke: #627284;
  stroke-width: 1.25;
  vector-effect: non-scaling-stroke;
}

.chart-tick-label,
.chart-axis-title {
  fill: var(--muted);
  font-size: 12px;
}

.chart-axis-title {
  fill: var(--text);
  font-size: 13px;
  font-weight: 700;
}

.chart-series-line {
  fill: none;
  stroke-width: 3;
  stroke-linecap: round;
  vector-effect: non-scaling-stroke;
}

.chart-series-label {
  font-size: 12px;
  font-weight: 750;
  paint-order: stroke;
  stroke: var(--surface);
  stroke-linejoin: round;
  stroke-width: 4px;
}

.chart-label-leader {
  opacity: 0.72;
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}

.chart-intersection-point {
  fill: var(--surface);
  stroke: #fff;
  stroke-width: 2.5;
  vector-effect: non-scaling-stroke;
}

.chart-intersection-label {
  fill: #fff;
  font-size: 11px;
  font-weight: 750;
  paint-order: stroke;
  stroke: var(--surface);
  stroke-linejoin: round;
  stroke-width: 4px;
}

.chart-current-point {
  stroke: var(--surface);
  stroke-width: 2;
  vector-effect: non-scaling-stroke;
}


.chart-empty {
  position: absolute;
  inset: 50% auto auto 50%;
  width: min(80%, 460px);
  margin: 0;
  color: var(--muted);
  text-align: center;
  transform: translate(-50%, -50%);
}

.chart-legend {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.chart-summary-card {
  min-width: 0;
  border: 1px solid color-mix(in srgb, var(--series-color) 42%, var(--line));
  border-radius: 14px;
  padding: 14px 15px;
  background:
    linear-gradient(135deg, var(--series-color-soft), transparent 76%),
    var(--surface);
}

.chart-summary-card__header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 11px;
}

.chart-summary-card__header strong {
  min-width: 0;
  overflow-wrap: anywhere;
}

.chart-summary-card__values {
  display: grid;
  gap: 1px;
  margin: 0;
  overflow: hidden;
  border: 1px solid rgb(255 255 255 / 7%);
  border-radius: 10px;
  background: rgb(255 255 255 / 7%);
}

.chart-summary-card__values > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 9px;
  background: rgb(17 21 27 / 72%);
}

.chart-summary-card__values dt {
  color: var(--muted);
  font-size: 0.76rem;
}

.chart-summary-card__values dd {
  margin: 0;
  color: var(--series-color);
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  white-space: nowrap;
}

.chart-legend__swatch {
  width: 22px;
  height: 3px;
  flex: 0 0 auto;
  border-radius: 999px;
  background: var(--series-color);
}

.chart-status {
  min-height: 1.4em;
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.intersection-notice {
  margin-top: 18px;
  border: 1px solid color-mix(in srgb, var(--accent) 42%, var(--line));
  border-radius: 14px;
  padding: 16px 18px;
  background: rgb(142 216 255 / 8%);
}

.intersection-notice h3 {
  margin: 0 0 8px;
  color: var(--accent-strong);
  font-size: 0.95rem;
}

.intersection-notice ul {
  display: grid;
  gap: 5px;
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
  font-size: 0.86rem;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid var(--line);
  padding-block: 24px 32px;
  color: var(--muted);
  font-size: 0.85rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

@media (max-width: 980px) {
  .vehicle-list {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 600px) {
  .page-shell,
  .site-footer {
    width: min(calc(100% - 24px), var(--page-width));
  }

  .page-shell {
    padding-block: 36px 50px;
  }

  .page-header {
    margin-bottom: 44px;
  }

  .section-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .section-actions .button {
    width: 100%;
  }

  .export-status {
    margin-right: 0;
  }

  .vehicle-card {
    border-radius: 16px;
  }

  .vehicle-card__header {
    align-items: center;
  }

  .field-grid,
  .result-grid {
    grid-template-columns: 1fr;
  }

  .results__heading {
    align-items: start;
    flex-direction: column;
    gap: 4px;
  }

  .results__status {
    text-align: left;
  }

  .chart-panel__heading {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .chart-panel__intro {
    margin-left: 0;
  }

  .chart-frame {
    border-radius: 16px;
  }

  .chart-tick-label,
  .chart-axis-title {
    font-size: 11px;
  }

  .chart-intersection-label {
    font-size: 10px;
  }

  .chart-series-label {
    font-size: 12px;
  }

  .chart-legend {
    grid-template-columns: 1fr;
  }

  .chart-summary-card__values > div {
    align-items: start;
    flex-direction: column;
    gap: 3px;
  }

  .site-footer {
    flex-direction: column;
    gap: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .button,
  .field__control {
    transition: none;
  }
}