.fuel-tool {
  max-width: 960px;
  margin-inline: auto;
}

.calculation-modes {
  margin: 0;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.calculation-modes:focus-within {
  border-color: var(--brand-strong);
}

.calculation-modes legend,
.fuel-examples legend {
  padding-inline: 0.35rem;
  font-weight: 800;
}

.calculation-modes__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
}

.calculation-modes label {
  display: flex;
  align-items: flex-start;
  min-height: 82px;
  margin: 0;
  padding: 0.75rem;
  gap: 0.6rem;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--surface-2);
  cursor: pointer;
}

.calculation-modes label:hover {
  border-color: var(--brand-strong);
}

.calculation-modes input {
  width: auto;
  min-height: auto;
  margin: 0.25rem 0 0;
  accent-color: var(--brand-strong);
}

.calculation-modes strong,
.calculation-modes small {
  display: block;
}

.calculation-modes small {
  margin-top: 0.25rem;
  color: var(--muted);
  font-weight: 400;
  line-height: 1.4;
}

.calculation-fields {
  margin-top: 1.35rem;
}

.calculation-fields h2 {
  margin: 0;
  font-size: clamp(1.25rem, 3vw, 1.6rem);
}

.calculation-hint {
  margin: 0.3rem 0 1rem;
  color: var(--muted);
}

.fuel-form-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.fuel-form-grid:has(#litersUsedField:not([hidden])) {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.money-input {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-2);
}

.money-input:focus-within {
  border-color: var(--brand-strong);
  outline: 3px solid #facc15;
  outline-offset: 3px;
}

.money-input > span {
  padding-left: 0.85rem;
  color: var(--muted);
  font-weight: 700;
}

.money-input input {
  border: 0;
  background: transparent;
}

.money-input input:focus-visible {
  outline: 0;
}

.fuel-tool input[aria-invalid="true"],
.fuel-tool .money-input:has(input[aria-invalid="true"]) {
  border-color: var(--danger);
}

.round-trip-option {
  display: flex;
  align-items: flex-start;
  margin: 0.15rem 0 1rem;
  padding: 0.8rem 1rem;
  gap: 0.7rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  cursor: pointer;
}

.round-trip-option:focus-within {
  border-color: var(--brand-strong);
}

.round-trip-option input {
  width: auto;
  min-height: auto;
  margin: 0.25rem 0 0;
  accent-color: var(--brand-strong);
}

.round-trip-option strong,
.round-trip-option small {
  display: block;
}

.round-trip-option small {
  margin-top: 0.2rem;
  color: var(--muted);
  font-weight: 400;
  line-height: 1.4;
}

.fuel-examples {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin: 0.25rem 0 1rem;
  padding: 0;
  border: 0;
}

.fuel-examples legend {
  width: 100%;
  margin-bottom: 0.4rem;
}

.example-button {
  min-height: 40px;
  padding-block: 0.55rem;
  font-size: 0.92rem;
}

.fuel-results {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.results-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.results-heading h2 {
  margin: 0;
}

.eyebrow {
  margin: 0 0 0.25rem;
  color: var(--brand);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.fuel-result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}

.fuel-result-grid:has(#litersResultCard[hidden]) {
  grid-template-columns: 1fr;
}

.round-trip-option[hidden],
.fuel-form-grid > [hidden],
.fuel-result-card[hidden] {
  display: none;
}

.fuel-result-card {
  min-width: 0;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 11px;
  background: var(--surface-2);
}

.fuel-result-card--primary {
  border-color: var(--brand-strong);
  background: rgba(22, 133, 248, 0.1);
}

.fuel-result-card span {
  display: block;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 700;
}

.fuel-result-card strong {
  display: block;
  margin-top: 0.3rem;
  font-size: clamp(1.35rem, 4vw, 2rem);
  line-height: 1.25;
  overflow-wrap: anywhere;
}

.result-explanation {
  margin: 1rem 0 0;
  font-size: 1.05rem;
}

.formula-box {
  margin-top: 0.8rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--surface-2);
  overflow-x: auto;
}

.formula-box span {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.formula-box code,
.fuel-content code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.fuel-content .formula {
  max-width: 100%;
  padding: 0.9rem;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--surface-2);
  overflow-x: auto;
}

@media (max-width: 760px) {
  .fuel-form-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .calculation-modes__grid,
  .fuel-result-grid {
    grid-template-columns: 1fr;
  }

  .results-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .results-heading button {
    width: 100%;
  }
}