.utility-main {
  min-height: calc(100vh - 76px);
  padding-block: 42px 88px;
}

.utility-shell {
  width: min(940px, calc(100% - 64px));
  margin-inline: auto;
}

.tool-back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  letter-spacing: 0.08em;
  transition: color var(--motion-fast) var(--ease-ui);
}

.tool-back-link:hover {
  color: var(--color-primary);
}

.tool-back-link span {
  color: var(--color-accent);
  font-size: var(--font-size-md);
}

.tool-heading {
  margin: 37px 0 34px;
}

.tool-heading .eyebrow {
  margin-bottom: 15px;
}

.tool-heading h1 {
  margin-bottom: 12px;
  font-size: clamp(2.5rem, 4rem, var(--font-size-display));
  line-height: 1.05;
}

.tool-heading > p:last-child {
  margin-bottom: 0;
  color: var(--color-text-secondary);
}

.utility-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  align-items: stretch;
  gap: var(--space-6);
}

.utility-panel {
  min-width: 0;
  padding: 24px;
}

.utility-panel-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: 19px;
}

.utility-index,
.result-live {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
}

.result-live {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--color-primary);
}

.result-live .status-dot {
  width: 6px;
  height: 6px;
}

.utility-panel h2 {
  margin-bottom: 22px;
  font-size: var(--font-size-lg);
  letter-spacing: -0.02em;
}

.utility-form {
  display: grid;
  gap: 19px;
}

.form-field {
  display: grid;
  min-width: 0;
  gap: 8px;
}

.form-field label,
.standard-fieldset legend {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.form-control {
  min-width: 0;
  font-size: 16px;
}

select.form-control {
  padding-right: 32px;
  background-color: var(--color-bg-raised);
}

.form-control[aria-invalid="true"] {
  border-color: var(--color-accent);
}

.unit-fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
}

.standard-fieldset {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.standard-fieldset legend {
  margin-bottom: 9px;
}

.standard-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
}

.transfer-mode-options {
  grid-template-columns: 1fr;
}

.standard-option {
  display: flex;
  min-height: 58px;
  align-items: center;
  gap: 10px;
  padding: 9px 11px;
  border: var(--border-default);
  background: var(--option-background);
  cursor: pointer;
  transition: border-color var(--motion-fast) var(--ease-ui), background var(--motion-fast) var(--ease-ui);
}

.standard-option:has(input:checked) {
  border-color: rgba(var(--rgb-cyan), 0.4);
  background: rgba(var(--rgb-cyan), 0.06);
}

.standard-option input {
  width: 15px;
  height: 15px;
  flex: 0 0 auto;
  margin: 0;
  accent-color: var(--color-primary);
}

.standard-option span {
  display: grid;
  gap: 2px;
}

.standard-option strong {
  color: var(--color-text);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.standard-option small {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 9px;
}

.input-error {
  margin: -5px 0 0;
  color: var(--color-accent);
  font-size: var(--font-size-sm);
}

.result-panel {
  border-top: 1px solid var(--color-primary);
}

.result-equation {
  margin: 6px 0 5px;
  overflow-wrap: anywhere;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
}

.result-value {
  display: block;
  overflow-wrap: anywhere;
  color: var(--color-primary);
  font-size: clamp(2rem, 3rem, var(--font-size-display));
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1.15;
}

.result-caption {
  min-height: 24px;
  margin: 10px 0 26px;
  color: var(--color-text-secondary);
  font-size: var(--font-size-xs);
}

.calculation-note {
  padding-top: 17px;
  border-top: 1px solid var(--color-border);
}

.calculation-note .mono-label {
  margin-bottom: 9px;
  color: var(--color-accent);
}

.calculation-note > p:not(.mono-label) {
  margin-bottom: 10px;
  color: var(--color-text-secondary);
  font-size: var(--font-size-xs);
  line-height: 1.75;
}

.calculation-note .unit-example {
  margin-bottom: 0;
  color: var(--color-primary);
  font-family: var(--font-mono);
}

.tool-footnote {
  margin: 20px 0 0;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 9px;
  text-align: right;
}

.field-help,
.source-note {
  margin: 0;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  line-height: 1.7;
}

.source-note {
  margin-top: 20px;
  padding-top: 13px;
  border-top: 1px solid var(--color-border);
}

.source-note a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.qr-utility-shell {
  width: min(1080px, calc(100% - 64px));
}

.qr-layout {
  grid-template-columns: minmax(0, 1.08fr) minmax(300px, 0.92fr);
}

.qr-textarea {
  min-height: 108px;
  padding: var(--space-3);
  resize: vertical;
  line-height: 1.55;
}

.qr-textarea-short {
  min-height: 78px;
}

.optional-label {
  margin-left: 5px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 8px;
  font-weight: 400;
}

.qr-color-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.color-field {
  display: flex;
  min-width: 0;
  min-height: 44px;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: 5px 8px 5px 11px;
  border: var(--border-default);
  color: var(--color-text-secondary);
  background: var(--option-background);
  cursor: pointer;
  font-size: var(--font-size-xs);
}

.color-field input[type="color"] {
  width: 36px;
  height: 30px;
  padding: 2px;
  border: var(--border-default);
  background: var(--color-surface);
  cursor: pointer;
}

.qr-options-row {
  margin-top: 2px;
}

.check-option {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  gap: 9px;
  color: var(--color-text-secondary);
  cursor: pointer;
  font-size: var(--font-size-sm);
}

.check-option input {
  width: 16px;
  height: 16px;
  margin: 0;
  accent-color: var(--color-primary);
}

.qr-preview-panel {
  display: flex;
  flex-direction: column;
}

.qr-preview-frame {
  display: grid;
  min-height: 300px;
  flex: 1 0 auto;
  place-items: center;
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  background: var(--color-bg-raised);
}

.qr-preview-frame canvas {
  display: block;
  width: min(100%, 384px);
  height: auto;
  image-rendering: pixelated;
}

.qr-preview-frame canvas[hidden] {
  display: none;
}

.qr-preview-placeholder {
  max-width: 230px;
  margin: 0;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  text-align: center;
}

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

.qr-download-actions .button {
  min-width: 0;
  min-height: 42px;
  gap: 8px;
  padding-inline: var(--space-2);
  font-size: var(--font-size-xs);
}

.qr-download-actions .button:disabled {
  border-color: var(--color-border);
  color: var(--color-text-muted);
  background: var(--color-bg-raised);
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

.qr-download-actions .button-quiet {
  grid-column: 1 / -1;
}

.qr-privacy-note {
  margin-top: 20px;
}

.qr-library-error {
  margin: 0;
  color: var(--color-accent);
  font-size: var(--font-size-sm);
  line-height: 1.6;
}

.text-entry {
  display: grid;
  justify-items: end;
  gap: var(--space-3);
}

.text-input {
  min-height: 270px;
  padding: var(--space-3);
  resize: vertical;
  line-height: 1.6;
}

.clear-button {
  min-height: 36px;
  font-size: var(--font-size-xs);
}

.text-rules {
  margin-top: 21px;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--color-border);
}

.metric-cell {
  display: grid;
  min-height: 112px;
  align-content: center;
  gap: 8px;
  border-bottom: 1px solid var(--color-border);
}

.metric-cell:nth-child(odd) {
  padding-right: var(--space-3);
  border-right: 1px solid var(--color-border);
}

.metric-cell:nth-child(even) {
  padding-left: var(--space-3);
}

.metric-label {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.06em;
}

.metric-value {
  color: var(--color-primary);
  font-size: var(--font-size-xl);
  font-weight: 600;
  line-height: 1.1;
}

.text-footnote {
  margin-top: 14px;
}

@media (max-width: 760px) {
  .utility-layout {
    grid-template-columns: 1fr;
  }

  .qr-layout {
    grid-template-columns: 1fr;
  }

  .qr-preview-frame {
    min-height: 280px;
  }
}

@media (max-width: 640px) {
  .utility-main {
    padding-block: 30px 60px;
  }

  .utility-shell {
    width: calc(100% - 40px);
  }

  .tool-heading {
    margin-top: 30px;
  }

  .tool-heading h1 {
    font-size: 42px;
  }

  .utility-panel {
    padding: 19px;
  }

  .qr-preview-frame {
    min-height: 240px;
  }
}

@media (max-width: 380px) {
  .unit-fields {
    grid-template-columns: 1fr;
  }
}