.calc-card {
  --calc-primary: #004ac6;
  --calc-primary-container: #2563eb;
  --calc-primary-dim: rgba(0, 74, 198, 0.08);
  --calc-surface-low: #f2f4f6;
  --calc-surface-lowest: #ffffff;
  --calc-surface-highest: #e0e3e5;
  --calc-on-surface: #191c1e;
  --calc-on-surface-variant: #434655;
  --calc-outline: #737686;
  --calc-border: rgba(195, 198, 215, 0.2);
  --calc-success: #16a34a;
  --calc-radius-sm: 2px;
  --calc-radius-lg: 4px;
  --calc-radius-xl: 8px;
  --calc-radius-pill: 20px;
  --calc-transition: 200ms ease;

  background-color: var(--calc-surface-low);
  border-radius: var(--calc-radius-xl);
  padding: 24px;
  border: 1px solid var(--calc-border);
  font-family: 'Inter', system-ui, sans-serif;
  color: var(--calc-on-surface);
  box-sizing: border-box;
  width: 100%;
  max-width: 860px;
  margin: auto;
}

.calc-card *, .calc-card *::before, .calc-card *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.calc-presets {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--calc-border);
}

@media (min-width: 640px) {
  .calc-presets {
    flex-direction: row;
    align-items: center;
  }
}

.calc-presets__label {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--calc-outline);
}

.calc-presets__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.calc-presets__btn {
  background-color: var(--calc-surface-lowest);
  border: 1px solid var(--calc-border);
  border-radius: var(--calc-radius-pill);
  padding: 6px 14px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--calc-on-surface);
  cursor: pointer;
  transition: all var(--calc-transition);
}

.calc-presets__btn:hover {
  background-color: var(--calc-primary-dim);
  border-color: var(--calc-primary);
  color: var(--calc-primary);
}

.calc-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 768px) {
  .calc-grid {
    grid-template-columns: 1.15fr 0.85fr;
  }
}

.calc-inputs {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.calc-section-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--calc-primary);
  margin-top: 6px;
}

.calc-split-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

@media (min-width: 480px) {
  .calc-split-row {
    grid-template-columns: 1fr 1fr;
  }
  .calc-split-row--triple {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

.calc-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.calc-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--calc-on-surface-variant);
}

.calc-input {
  width: 100%;
  height: 40px;
  padding: 0 12px;
  font-size: 14px;
  color: var(--calc-on-surface);
  background-color: var(--calc-surface-lowest);
  border: 1px solid var(--calc-border);
  border-radius: var(--calc-radius-lg);
  transition: border-color var(--calc-transition);
}

.calc-input:focus {
  outline: none;
  border-color: var(--calc-primary);
}

.calc-select {
  cursor: pointer;
}

.calc-save-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 42px;
  background-color: var(--calc-surface-lowest);
  border: 1px solid var(--calc-border);
  border-radius: var(--calc-radius-lg);
  font-size: 13px;
  font-weight: 600;
  color: var(--calc-on-surface);
  cursor: pointer;
  margin-top: 8px;
  transition: all var(--calc-transition);
}

.calc-save-btn:hover {
  background-color: var(--calc-primary-dim);
  border-color: var(--calc-primary);
  color: var(--calc-primary);
}

.calc-save-btn__icon {
  font-size: 18px;
}

.calc-results {
  background-color: var(--calc-surface-lowest);
  border: 1px solid var(--calc-border);
  border-radius: var(--calc-radius-xl);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.calc-hero-row {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--calc-border);
}

.calc-hero-result {
  display: flex;
  flex-direction: column;
}

.calc-hero-result__label {
  font-size: 12px;
  font-weight: 600;
  color: var(--calc-outline);
}

.calc-hero-result__value {
  font-size: 28px;
  font-weight: 800;
  color: var(--calc-primary);
  line-height: 1.2;
}

.calc-hero-result__unit {
  font-size: 12px;
  color: var(--calc-on-surface-variant);
}

.calc-hero-result--sub .calc-hero-result__value {
  font-size: 20px;
  color: var(--calc-on-surface);
}

.calc-detail-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

@media (min-width: 480px) {
  .calc-detail-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.calc-detail-item {
  display: flex;
  flex-direction: column;
  background-color: var(--calc-surface-low);
  padding: 10px 12px;
  border-radius: var(--calc-radius-lg);
}

.calc-detail-item__label {
  font-size: 11px;
  color: var(--calc-outline);
}

.calc-detail-item__value {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--calc-on-surface);
  margin-top: 2px;
}

.calc-spec-block {
  background-color: rgba(22, 163, 74, 0.06);
  border: 1px solid rgba(22, 163, 74, 0.2);
  border-radius: var(--calc-radius-lg);
  padding: 12px;
}

.calc-spec-block__label {
  display: block;
  font-size: 11px;
  font-weight: 700;
  color: var(--calc-success);
  margin-bottom: 2px;
}

.calc-spec-block__value {
  font-size: 12px;
  color: var(--calc-on-surface);
}

.calc-saved {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--calc-border);
}

.calc-saved__header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 700;
  color: var(--calc-on-surface);
  margin-bottom: 12px;
}

.calc-saved__header-icon {
  color: var(--calc-primary);
  font-size: 18px;
}

.calc-saved-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  background-color: var(--calc-surface-lowest);
  border: 1px solid var(--calc-border);
  border-radius: var(--calc-radius-lg);
  margin-bottom: 8px;
  cursor: pointer;
  transition: all var(--calc-transition);
}

.calc-saved-item:hover {
  border-color: var(--calc-primary);
}

.calc-saved-item__info {
  display: flex;
  flex-direction: column;
}

.calc-saved-item__name {
  font-size: 13px;
  font-weight: 700;
  color: var(--calc-on-surface);
}

.calc-saved-item__meta {
  font-size: 11.5px;
  color: var(--calc-outline);
}

.calc-saved-item__del {
  background: none;
  border: none;
  color: var(--calc-outline);
  cursor: pointer;
  padding: 4px;
}

.calc-saved-item__del:hover {
  color: #dc2626;
}