.calc-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}
.calc-head p {
  color: var(--ink-2);
}
.calc-head svg {
  margin: 0 auto 24px;
}

.calc-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin-top: 44px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.calc-controls {
  padding: 36px;
  background: #fff;
}
.calc-field {
  margin-bottom: 26px;
}
.calc-field label {
  display: block;
  font-weight: 600;
  margin-bottom: 10px;
  font-size: 14px;
}
.calc-input-row {
  display: flex;
  align-items: center;
  gap: 16px;
}
.calc-input-row input[type="range"] {
  flex: 1;
  accent-color: var(--blue);
}
.calc-num {
  font-family: var(--mono);
  font-weight: 600;
  min-width: 34px;
  text-align: right;
}
.calc-select {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-family: var(--font);
  font-size: 15px;
  background: #fff;
}
.calc-result {
  padding: 36px;
  background: var(--blue-soft);
  display: flex;
  flex-direction: column;
}
.calc-result-label {
  font-size: 14px;
  color: var(--ink-2);
  font-weight: 600;
}
.calc-savings {
  font-size: clamp(34px, 5vw, 52px);
  font-weight: 800;
  color: var(--blue-deep);
  letter-spacing: -0.02em;
  margin: 6px 0 2px;
}
.calc-savings small {
  font-size: 16px;
  font-weight: 600;
  color: var(--blue);
}
.calc-period {
  font-size: 15px;
  color: var(--ink-2);
}
.calc-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 22px 0;
}
.c-label {
  font-size: 13px;
  color: var(--muted);
}
.c-val {
  font-size: 22px;
  font-weight: 700;
  margin-top: 3px;
}
.c-val.km {
  color: var(--blue-deep);
}
.calc-result .btn-primary {
  margin-top: auto;
  width: 100%;
  padding: 14px;
}
.calc-note {
  font-size: 10px;
  color: var(--muted);
  margin-top: 12px;
  line-height: 1.4;
}
@media (max-width: 760px) {
  .calc-box {
    grid-template-columns: 1fr;
  }
}