.header-link {
  font-size: 0.875rem;
  font-weight: 500;
}

.github-link,
.github-stars {
  display: inline-flex;
  align-items: center;
}

.github-link {
  gap: var(--space-2);
}

.github-stars {
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-control);
  background: var(--surface-secondary);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-decoration: none;
}

.github-stars[hidden] {
  display: none;
}

.app-main {
  padding-block: var(--space-12) var(--space-20);
}

.app-intro {
  max-width: 56rem;
  margin-bottom: var(--space-12);
}

.app-intro h1 {
  max-width: 15ch;
}

.calculator-layout {
  display: grid;
  align-items: start;
  gap: var(--space-8);
}

.controls-card,
.product-result {
  min-width: 0;
}

.section-heading h2,
.result-heading h2 {
  margin-bottom: 0;
}

.step-label {
  margin-bottom: var(--space-2);
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
}

.control-stack {
  display: grid;
  gap: var(--space-8);
  margin-top: var(--space-8);
}

.control-block {
  display: grid;
  gap: var(--space-3);
  margin: 0;
}

.label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.label-row .field-label,
.control-block legend {
  margin: 0;
}

.compact-button {
  min-height: 2.75rem;
  padding: var(--space-2);
}

.input-with-unit {
  position: relative;
  flex: 0 0 7rem;
}

.input-with-unit .number-input {
  width: 100%;
  padding-right: 2.5rem;
}

.input-with-unit > span {
  position: absolute;
  inset: 50% var(--space-3) auto auto;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  transform: translateY(-50%);
  pointer-events: none;
}

.field-error {
  margin: 0;
  color: var(--status-error);
  font-size: 0.875rem;
  line-height: 1.5;
}

.detect-status,
.copy-status {
  min-height: 1.25rem;
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.8125rem;
  line-height: 1.5;
}

.control-block .segmented label {
  gap: 0.125rem;
}

.control-block .segmented label strong {
  font-size: 0.875rem;
}

.control-block .segmented label span {
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
}

.advanced-panel {
  border-top: 1px solid var(--border-default);
  border-bottom: 1px solid var(--border-default);
}

.advanced-panel summary {
  min-height: 2.75rem;
  padding-block: var(--space-4);
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 600;
}

.advanced-content {
  display: grid;
  gap: var(--space-3);
  padding-bottom: var(--space-5);
}

.control-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: var(--space-6);
}

.product-result {
  padding: clamp(var(--space-6), 5vw, var(--space-10));
}

.result-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
}

.result-badge {
  padding: var(--space-2) var(--space-3);
  border-radius: 999px;
  background: var(--surface-secondary);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  white-space: nowrap;
}

.primary-result {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  margin-block: var(--space-10) var(--space-4);
}

.result-scale {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-2);
  margin-top: var(--space-8);
}

.scale-item {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-4);
  border-radius: var(--radius-control);
  background: var(--surface-secondary);
}

.scale-item span {
  color: var(--text-tertiary);
  font-size: 0.75rem;
}

.scale-item strong {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-variant-numeric: tabular-nums;
}

.scale-item-featured {
  background: var(--surface-inverse);
  color: var(--text-on-inverse);
}

.scale-item-featured span {
  color: inherit;
  opacity: 0.72;
}

.equation {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
  margin-top: var(--space-8);
  padding: var(--space-4);
  border-radius: var(--radius-control);
  background: var(--surface-secondary);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.equation strong {
  color: var(--text-primary);
  font-weight: 600;
}

.product-details {
  font-size: 0.875rem;
}

.result-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-top: var(--space-8);
}

.method-section {
  margin-top: var(--space-20);
}

.method-grid {
  display: grid;
  gap: 1px;
  margin-top: var(--space-8);
  overflow: hidden;
  border-radius: var(--radius-panel);
  background: var(--border-default);
  box-shadow: var(--shadow-ring);
}

.method-grid article {
  min-width: 0;
  padding: var(--space-6);
  background: var(--surface-primary);
}

.method-grid article p {
  margin-bottom: 0;
  color: var(--text-secondary);
  line-height: 1.6;
}

.method-index {
  display: block;
  margin-bottom: var(--space-8);
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.limitation-notice {
  margin-top: var(--space-6);
}

.site-footer {
  display: flex;
  min-height: 6rem;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  border-top: 1px solid var(--border-default);
  color: var(--text-tertiary);
  font-size: 0.8125rem;
}

.site-footer p {
  margin: 0;
}

.site-footer nav {
  display: flex;
  gap: var(--space-4);
}

@media (min-width: 48rem) {
  .method-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 54rem) {
  .calculator-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .product-result {
    position: sticky;
    top: var(--space-6);
  }

}

@media (max-width: 35rem) {
  .label-row,
  .result-heading,
  .result-actions,
  .site-footer {
    align-items: stretch;
    flex-direction: column;
  }

  .range-row {
    align-items: stretch;
    flex-direction: column;
  }

  .input-with-unit {
    flex-basis: auto;
    width: 100%;
  }

  .result-scale {
    grid-template-columns: 1fr;
  }

  .site-footer {
    justify-content: center;
    padding-block: var(--space-6);
  }
}

@media (prefers-reduced-motion: reduce) {
  .input-with-unit > span {
    transform: translateY(-50%);
  }
}