.form-field select {
  width: 100%;
  min-height: var(--control-height-md);
  padding: 0.72rem 0.85rem;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  outline: 0;
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background-color var(--transition-fast);
}

.form-field select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 17%, transparent);
}

.form-field__description {
  margin: 0;
  color: var(--color-muted);
  font-size: var(--font-size-xs);
  line-height: 1.45;
}

.assunto-form__grid,
.assunto-form__tracking-grid {
  display: grid;
  gap: var(--space-4);
}

.assunto-form__grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.assunto-form__tracking-grid {
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
}

.assunto-form__tracking-grid > .form-field {
  align-self: start;
  align-content: start;
}

.assunto-form__content-grid .form-field textarea {
  min-height: 7rem;
}

.materia-workspace {
  display: grid;
  gap: var(--space-5);
}

.materia-workspace__header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: var(--space-4);
}

.materia-workspace__heading h2 {
  margin: 0;
}

.materia-workspace__heading p {
  margin: var(--space-2) 0 0;
  color: var(--color-muted);
  font-size: var(--font-size-sm);
}

.temas-list {
  display: grid;
  gap: var(--space-4);
}

.tema-accordion {
  min-width: 0;
  overflow: visible;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-large);
  box-shadow: var(--shadow-card);
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.tema-accordion.is-expanded {
  border-color: color-mix(in srgb, var(--color-primary) 25%, var(--color-border));
  box-shadow: var(--shadow-soft);
}

.tema-accordion__header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(12rem, 18rem) auto;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
}

.tema-accordion__toggle {
  display: flex;
  min-width: 0;
  align-items: flex-start;
  gap: var(--space-3);
  color: var(--color-text);
  text-align: left;
  background: transparent;
  border-radius: var(--radius-small);
}

.tema-accordion__toggle:hover .tema-accordion__title {
  color: var(--color-primary-strong);
}

.tema-accordion__toggle-icon {
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  flex: 0 0 auto;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border-radius: var(--radius-small);
}

.tema-accordion__toggle-icon svg {
  transform: rotate(-90deg);
  transition: transform var(--transition-fast);
}

.tema-accordion.is-expanded .tema-accordion__toggle-icon svg {
  transform: rotate(0deg);
}

.tema-accordion__identity {
  display: grid;
  min-width: 0;
  gap: var(--space-1);
}

.tema-accordion__title {
  overflow: hidden;
  font-size: 1.05rem;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.tema-accordion__description {
  display: -webkit-box;
  overflow: hidden;
  color: var(--color-muted);
  font-size: var(--font-size-sm);
  line-height: 1.45;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.tema-accordion__summary {
  color: var(--color-muted-strong);
  font-size: var(--font-size-xs);
  font-weight: 750;
}

.tema-accordion__actions,
.tema-accordion__reorder {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.tema-accordion__body {
  display: grid;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5) var(--space-5);
  border-top: 1px solid var(--color-border);
}

.tema-accordion__body[hidden] {
  display: none;
}

.tema-accordion__progress {
  min-width: 0;
}

.tema-accordion__progress--header {
  align-self: center;
}

.tema-accordion__progress > p {
  margin: 0;
  color: var(--color-muted-strong);
  font-size: var(--font-size-sm);
  font-weight: 700;
}

.tema-empty-state {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4);
  background: var(--color-surface-soft);
  border: 1px dashed var(--color-border-strong);
  border-radius: var(--radius-medium);
}

.tema-empty-state strong {
  display: block;
}

.tema-empty-state p {
  margin: var(--space-1) 0 0;
  color: var(--color-muted);
  font-size: var(--font-size-sm);
}

.assuntos-list {
  display: grid;
  gap: var(--space-3);
}

.assunto-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
  padding: var(--space-3);
  background: var(--color-surface-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  transition:
    border-color var(--transition-fast),
    background-color var(--transition-fast),
    transform var(--transition-fast);
}

.assunto-row:hover {
  background: var(--color-surface);
  border-color: color-mix(in srgb, var(--color-primary) 25%, var(--color-border));
}

.assunto-row__open {
  display: block;
  min-width: 0;
  width: fit-content;
  max-width: 100%;
  padding: var(--space-1);
  color: inherit;
  text-align: left;
  background: transparent;
  border-radius: var(--radius-small);
}

.assunto-row__content {
  display: grid;
  min-width: 0;
  gap: var(--space-2);
}

.assunto-row__title {
  display: block;
  margin: 0;
  overflow: hidden;
  font-size: var(--font-size-md);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.assunto-row__description {
  display: -webkit-box;
  margin: 0;
  overflow: hidden;
  color: var(--color-muted);
  font-size: var(--font-size-sm);
  line-height: 1.45;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.assunto-row__meta,
.assunto-row__actions,
.assunto-row__reorder {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.assunto-row__meta {
  flex-wrap: wrap;
}

.assunto-row__date {
  color: var(--color-muted-strong);
  font-size: var(--font-size-xs);
  font-weight: 650;
}

/* Etapa 6 — trilho vertical compacto para as ações do Assunto em telas amplas. */
@media (min-width: 42.0625rem) {
  .assunto-row {
    grid-template-columns: minmax(0, 1fr) minmax(3rem, 10%);
    align-items: stretch;
  }

  .assunto-row__actions {
    width: 100%;
    min-width: 0;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-1);
  }

  .assunto-row__reorder {
    flex: 0 0 auto;
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
  }

  .assunto-row.is-archived {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .assunto-row.is-archived .assunto-row__actions {
    width: auto;
  }
}

.assunto-detail {
  display: grid;
  gap: var(--space-5);
}

.assunto-detail__badges {
  display: grid;
  gap: var(--space-1);
}

.assunto-detail__study-stack {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-4);
  background: linear-gradient(
    135deg,
    color-mix(in srgb, var(--color-primary) 14%, var(--color-surface)),
    color-mix(in srgb, var(--color-info) 7%, var(--color-surface))
  );
  border: 1px solid color-mix(in srgb, var(--color-primary) 30%, var(--color-border));
  border-radius: var(--radius-medium);
}

.assunto-detail__study-stack strong {
  color: var(--color-text);
  font-size: var(--font-size-sm);
}

.assunto-detail__study-stack p {
  margin: 0;
  color: var(--color-muted-strong);
  font-size: var(--font-size-sm);
  line-height: 1.55;
}

.assunto-detail__study-stack-button {
  width: 100%;
  margin-top: var(--space-2);
}

.assunto-detail__section {
  padding: var(--space-4);
  background: var(--color-surface-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
}

.assunto-detail__section h3 {
  margin: 0 0 var(--space-2);
  font-size: var(--font-size-sm);
}

.assunto-detail__section p {
  margin: 0;
  color: var(--color-muted-strong);
  line-height: 1.65;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

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

.assunto-detail__grid > div {
  min-width: 0;
  padding: var(--space-3);
  background: var(--color-surface-soft);
  border-radius: var(--radius-small);
}

.assunto-detail__grid dt {
  color: var(--color-muted);
  font-size: var(--font-size-xs);
  font-weight: 700;
}

.assunto-detail__grid dd {
  margin: var(--space-1) 0 0;
  overflow-wrap: anywhere;
  color: var(--color-text);
  font-size: var(--font-size-sm);
  font-weight: 700;
}

@media (max-width: 70rem) {
  .tema-accordion__header {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .tema-accordion__progress--header {
    grid-column: 1 / -1;
    grid-row: 2;
    padding-left: 2.75rem;
  }

  .tema-accordion__actions {
    justify-content: flex-end;
  }
}

@media (max-width: 42rem) {
  .assunto-form__grid,
  .assunto-form__tracking-grid,
  .assunto-detail__grid {
    grid-template-columns: 1fr;
  }

  .tema-accordion__header,
  .tema-accordion__body {
    padding-right: var(--space-4);
    padding-left: var(--space-4);
  }

  .tema-accordion__progress--header {
    padding-left: 0;
  }

  .tema-accordion__actions {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto auto;
    padding-left: 0;
  }

  .tema-accordion__actions > .button {
    width: 100%;
  }

  .tema-empty-state {
    align-items: stretch;
    flex-direction: column;
  }

  .tema-empty-state .button {
    width: 100%;
  }

  .assunto-row {
    grid-template-columns: 1fr;
  }

  .assunto-row__actions {
    justify-content: space-between;
    padding-top: var(--space-2);
    border-top: 1px solid var(--color-border);
  }

  .assunto-row__reorder {
    flex: 1;
  }

  .assunto-row__reorder .icon-button {
    width: auto;
    flex: 1;
  }

  .materia-page .page-header__actions {
    align-items: stretch;
    flex-direction: column;
  }

  .materia-page .page-header__actions > .button,
  .materia-page .page-header__actions > .action-menu {
    flex: 0 0 auto;
  }

  .materia-page .page-header__actions .button {
    width: 100%;
  }
}

.modal--structure-move {
  width: min(38rem, 100%);
}

.structure-move-form__origin {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-3) var(--space-4);
  color: var(--color-muted);
  font-size: var(--font-size-sm);
  line-height: 1.5;
  background: var(--color-surface-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
}

.structure-move-form__item {
  color: var(--color-text);
  font-size: var(--font-size-md);
}

.structure-move-form__path {
  color: var(--color-muted);
}

.structure-move-form > .form-field__description {
  padding: var(--space-3) var(--space-4);
  background: color-mix(in srgb, var(--color-primary) 7%, transparent);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius-small);
}

/* M10 — adaptação estrutural do workspace */
@media (max-width: 54rem) {
  .materia-workspace__header {
    align-items: stretch;
    flex-direction: column;
  }

  .materia-workspace__header > .button {
    width: 100%;
  }
}

@media (max-width: 42rem) {
  .tema-accordion__header {
    grid-template-columns: 1fr;
  }

  .tema-accordion__toggle,
  .tema-accordion__progress--header,
  .tema-accordion__actions {
    grid-column: 1;
  }

  .tema-accordion__toggle {
    grid-row: 1;
  }

  .tema-accordion__progress--header {
    grid-row: 2;
  }

  .tema-accordion__actions {
    grid-row: 3;
    width: 100%;
  }

  .assunto-row__open {
    width: 100%;
  }
}

.tema-accordion.is-archived,
.assunto-row.is-archived {
  background: color-mix(in srgb, var(--color-surface-soft) 90%, var(--color-border));
  border-color: var(--color-border-strong);
}

.tema-accordion__restore,
.assunto-row__restore {
  white-space: nowrap;
}

.assunto-row.is-archived .assunto-row__description {
  color: var(--color-muted-strong);
}