.spec-declaration-builder {
  margin: 1.2rem 0;
}

.spec-declaration-section {
  margin: 1rem 0;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: .85rem;
  background: var(--surface-muted);
}

.spec-declaration-section > h2,
.spec-section-head h2 {
  margin-top: 0;
}

.spec-declaration-field-grid,
.spec-factor-grid,
.spec-output-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .85rem;
}

.spec-declaration-field {
  display: grid;
  gap: .5rem;
  min-width: 0;
  padding: .8rem;
  border: 1px solid var(--border);
  border-radius: .7rem;
  background: var(--surface-solid);
}

.spec-declaration-field-head,
.spec-section-head {
  display: flex;
  gap: .7rem;
  justify-content: space-between;
  align-items: flex-start;
}

.spec-declaration-field-head > span:first-child {
  display: grid;
  gap: .18rem;
}

.spec-required,
.spec-optional {
  flex: 0 0 auto;
  padding: .12rem .4rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  font-size: .63rem;
  font-weight: 800;
}

.spec-field-purpose,
.spec-field-boundary,
.spec-validity-note {
  color: var(--muted);
  font-size: .8rem;
  line-height: 1.45;
}

.spec-declaration-field input,
.spec-declaration-field textarea,
.spec-factor-card input,
.spec-factor-card textarea,
.spec-factor-card select,
.spec-validity-mode select {
  width: 100%;
  min-height: 2.5rem;
  padding: .52rem .62rem;
  border: 1px solid var(--border);
  border-radius: .52rem;
  background: var(--surface-solid);
  color: var(--text);
  font: inherit;
}

.spec-declaration-field textarea,
.spec-factor-card textarea {
  min-height: 5rem;
  resize: vertical;
}

.spec-field-boundary {
  padding-top: .48rem;
  border-top: 1px solid var(--border);
}

.spec-field-boundary strong {
  display: block;
  margin-bottom: .12rem;
  color: var(--text);
  font-size: .66rem;
  letter-spacing: .03em;
  text-transform: uppercase;
}

.spec-section-head p {
  margin: .2rem 0 0;
  color: var(--muted);
  font-size: .82rem;
}

.spec-section-head button,
.spec-declaration-actions button,
.spec-remove-factor,
.spec-output-grid button {
  min-height: 2.45rem;
  padding: .5rem .75rem;
  border: 1px solid var(--border);
  border-radius: .55rem;
  background: var(--surface-solid);
  color: var(--text);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.spec-section-head button:hover,
.spec-declaration-actions button:hover,
.spec-remove-factor:hover:not(:disabled),
.spec-output-grid button:hover:not(:disabled) {
  border-color: var(--border-strong);
}

.spec-factor-list {
  display: grid;
  gap: .8rem;
  margin-top: .85rem;
}

.spec-factor-card {
  min-width: 0;
  padding: .85rem;
  border: 1px solid var(--border);
  border-radius: .75rem;
  background: var(--surface-solid);
}

.spec-factor-card legend {
  padding: 0 .35rem;
  font-weight: 800;
}

.spec-factor-grid label {
  display: grid;
  gap: .3rem;
  color: var(--muted);
  font-size: .76rem;
  font-weight: 800;
}

.spec-factor-wide {
  grid-column: 1 / -1;
}

.spec-remove-factor {
  margin-top: .75rem;
}

.spec-remove-factor:disabled,
.spec-output-grid button:disabled {
  opacity: .55;
  cursor: not-allowed;
}

.spec-validity-mode {
  display: grid;
  gap: .3rem;
  max-width: 44rem;
  color: var(--muted);
  font-size: .78rem;
  font-weight: 800;
}

.spec-validity-note {
  margin-bottom: 0;
}

.spec-declaration-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
  margin-top: 1rem;
}

.spec-builder-errors {
  margin: 1rem 0;
  padding: .85rem;
  border: 1px solid var(--border-strong);
  border-radius: .7rem;
  background: var(--surface-muted);
}

.spec-builder-errors strong {
  display: block;
  margin-bottom: .35rem;
}

.spec-builder-errors ul {
  margin-bottom: 0;
}

.spec-builder-status {
  margin: .75rem 0 1rem;
  color: var(--muted);
  font-size: .84rem;
}

.spec-output-grid {
  margin: 1rem 0 1.5rem;
}

.spec-output-grid > article {
  min-width: 0;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: .85rem;
  background: var(--surface-muted);
}

.spec-output-grid h2 {
  margin-top: 0;
  font-size: 1.05rem;
}

.spec-output-grid p {
  color: var(--muted);
  font-size: .82rem;
}

.spec-output-grid pre {
  max-height: 36rem;
  overflow: auto;
}

.spec-declaration-builder :is(input, textarea, select, button):focus-visible,
.spec-output-grid button:focus-visible {
  outline: 3px solid var(--brand);
  outline-offset: 2px;
}

@media (max-width: 860px) {
  .spec-declaration-field-grid,
  .spec-factor-grid,
  .spec-output-grid {
    grid-template-columns: 1fr;
  }

  .spec-factor-wide {
    grid-column: auto;
  }

  .spec-declaration-field-head,
  .spec-section-head {
    flex-direction: column;
  }
}

@media (forced-colors: active) {
  .spec-declaration-section,
  .spec-declaration-field,
  .spec-required,
  .spec-optional,
  .spec-declaration-field input,
  .spec-declaration-field textarea,
  .spec-factor-card,
  .spec-factor-card input,
  .spec-factor-card textarea,
  .spec-factor-card select,
  .spec-validity-mode select,
  .spec-section-head button,
  .spec-declaration-actions button,
  .spec-remove-factor,
  .spec-builder-errors,
  .spec-output-grid > article,
  .spec-output-grid button {
    border-color: CanvasText;
  }

  .spec-declaration-builder :is(input, textarea, select, button):focus-visible,
  .spec-output-grid button:focus-visible {
    outline-color: Highlight;
  }
}