:root {
  --ink-2: #0f2236;
  --ink-3: #0a1a2b;
  --slate-2: rgba(255, 255, 255, 0.5);
  --accent: #fcd400;
  --mono: ui-monospace, "SF Mono", "Roboto Mono", Menlo, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

/* siatka 2 kolumny z cienkimi liniami między */
.calc {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 4px;
  overflow: hidden;
}

.calc__panel {
  background: var(--ink-2);
  padding: 48px 44px;
}

.calc__result {
  background: var(--ink-3);
  padding: 48px 44px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}

/* nagłówki sekcji */
.calc__eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--slate-2);
  margin-bottom: 24px;
}

.calc__eyebrow--accent {
  color: var(--accent);
  margin-bottom: 16px;
}

/* pole z suwakiem */
.field--gap {
  margin-top: 32px;
}

.field__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 14px;
}

.field__name {
  font-size: 15px;
  color: #fff;
  font-weight: 500;
}

.field__value {
  font-family: var(--sans);
  font-size: 30px;
  font-weight: 500;
  letter-spacing: -0.025em;
  color: var(--accent);
  line-height: 1;
}

.field__unit {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  margin-left: 8px;
  letter-spacing: 0;
  font-weight: 400;
}

.field__scale {
  display: flex;
  justify-content: space-between;
  margin-top: 6px;
}

.field__scale span {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--slate-2);
}

/* suwak */
.slider {
  width: 100%;
  height: 6px;
  appearance: none;
  -webkit-appearance: none;
  outline: none;
  border-radius: 3px;
  cursor: pointer;
  /* tło (wypełnienie) ustawiane przez JS / PHP */
  background: rgba(255, 255, 255, 0.15);
  padding: 0 !important;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--accent);
  cursor: pointer;
  margin-top: 0px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--accent);
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* rozbicie kosztów */
.breakdown {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.breakdown__title {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--slate-2);
  margin-bottom: 16px;
}

.breakdown__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.breakdown__label {
  font-size: 14px;
  color: #fff;
}

.breakdown__formula {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--slate-2);
  margin-top: 2px;
}

.breakdown__amount {
  font-family: var(--mono);
  font-size: 16px;
  font-weight: 500;
  color: #fff;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.breakdown__amount--muted {
  color: rgba(255, 255, 255, 0.85);
}

/* oszczędność */
.saving {
  font-family: var(--sans);
  font-weight: 500;
  font-size: clamp(56px, 8vw, 112px);
  line-height: 1;
  letter-spacing: -0.045em;
  color: var(--accent);
}

.saving__currency {
  font-size: 0.36em;
  color: #fff;
  letter-spacing: 0;
  margin-left: 8px;
}

.saving__note {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.65);
  margin-top: 18px;
  max-width: 360px;
}

/* przycisk CTA */
.calc__cta {
  margin-top: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--accent);
  color: #0a1a33;
  padding: 16px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.005em;
  border: 0;
  cursor: pointer;
  transition: transform 0.2s;
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-2px);
}

/* MOBILE */
@media (max-width: 768px) {
  .calc {
    grid-template-columns: 1fr;
  }

  .calc__panel,
  .calc__result {
    padding: 32px 24px;
  }
}