.cost-calculator {
  margin: 24px 0;
}
.cost-calculator .row > div {
  flex-grow: 1;
}
.cost-calculator fieldset {
  flex: 1;
  min-width: 0;
  margin: 0;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--subtle);
}
.cost-calculator legend {
  float: left;
  width: 100%;
  margin: 0 0 8px;
  padding: 0;
  font-size: 16px;
  line-height: 1.5;
  font-weight: 700;
}
.cost-calculator .form-check {
  margin: 0;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-control);
  background: var(--surface);
  font-size: 14px;
  line-height: 1.5;
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.cost-calculator .form-check:hover {
  background: var(--hover);
}
.cost-calculator .form-check:has(:checked) {
  background: var(--accent-soft);
  border-color: color-mix(in srgb, var(--red) 28%, var(--line));
}
.cost-calculator .form-check:has(:focus-visible) {
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--red) 18%, transparent);
}
.cost-calculator .form-check-input:focus-visible {
  box-shadow: none;
}
.cost-calculator .form-check + .form-check {
  margin-top: 8px;
}
.cost-calculator output {
  display: block;
  margin-top: 16px;
  padding: 16px;
  border-radius: var(--radius);
  background: var(--accent-soft);
  font-weight: 700;
}