.page-title-heading {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.pane-collapse-button,
.entity-delete-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 32px;
  width: 32px;
  height: 32px;
  padding: 6px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--text-muted);
}

.pane-collapse-button:hover,
.entity-delete-button:hover {
  background: var(--surface-hover, #f0f2eb);
  color: var(--text);
}

.pane-collapse-button svg,
.entity-delete-button svg {
  width: 18px;
  height: 18px;
}

.entity-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.course-workspace > header > .entity-header-actions {
  flex: 0 0 auto;
}

.lesson-editor > header {
  display: flex;
  align-items: center;
  gap: 8px;
}

.lesson-editor > header > input {
  min-width: 0;
  flex: 1;
}

.learning-workbench.rail-collapsed {
  grid-template-columns: minmax(0, 1fr);
}

.learning-workbench.rail-collapsed > .learning-rail {
  display: none;
}

.shelf-workbench.rail-collapsed {
  grid-template-columns: minmax(0, 1fr);
}

.shelf-workbench.rail-collapsed > .folder-rail {
  display: none;
}

.problem-library-heading {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

@media (min-width: 761px) {
  .problems-layout.library-collapsed {
    grid-template-columns: 48px minmax(0, 1fr);
  }

  .library-collapsed > .problem-library .library-tools,
  .library-collapsed > .problem-library .problem-list,
  .library-collapsed > .problem-library .shelf-action-error,
  .library-collapsed > .problem-library .pane-titlebar h1,
  .library-collapsed > .problem-library .pane-titlebar > button {
    display: none;
  }

  .library-collapsed > .problem-library .pane-titlebar {
    min-height: 64px;
    padding: 8px;
  }

  .library-collapsed > .problem-library .problem-library-heading {
    gap: 0;
  }
}

@media (max-width: 760px) {
  .problem-library-toggle {
    display: none;
  }

  .pane-collapse-button,
  .entity-delete-button {
    flex-basis: 40px;
    width: 40px;
    height: 40px;
  }

  .conversation-delete {
    width: 40px;
    height: 40px;
  }
}

@media (max-width: 760px) {
  .learning-page .course-workspace > header {
    display: flex;
    flex-direction: column;
    align-items: stretch;
  }

  .learning-page .course-workspace > header > .entity-header-actions {
    flex-wrap: nowrap;
    justify-content: flex-end;
  }

  .lesson-editor > header {
    flex-direction: row;
    align-items: center;
  }

  .lesson-editor > header > input {
    width: 0;
    flex: 1 1 0%;
  }
}

.conversation-row {
  display: flex;
  align-items: center;
  min-width: 0;
  border-bottom: 1px solid #ddd9e8;
}

.conversation-open {
  min-width: 0;
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 5px;
  text-align: left;
  background: transparent;
  font-size: 13px;
}

.conversation-open svg {
  width: 14px;
  flex: none;
  color: var(--violet);
}

.conversation-open span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.conversation-delete {
  flex: none;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  padding: 7px;
  background: transparent;
  color: var(--muted);
  border-radius: 6px;
}

.conversation-delete svg {
  width: 16px;
  height: 16px;
}

.conversation-delete:hover {
  background: var(--danger-soft, #f8e9e8);
  color: var(--danger, #ac3939);
}

.agent-header-actions {
  flex-wrap: wrap;
}

.agent-header-actions .provider-pill {
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}