/* Knowledge management extends the existing exercise-editor visual language. */
.knowledge-manager {
    display: grid;
    grid-template-columns: 340px minmax(520px, 1fr) 360px;
    min-height: calc(100vh - var(--navigation-height));
    background: var(--color-workspace);
    transition: grid-template-columns var(--transition-base);
}

.knowledge-manager.sidebar-collapsed {
    grid-template-columns: 58px minmax(520px, 1fr) 360px;
}

.knowledge-sidebar {
    min-width: 0;
    transition: width var(--transition-base);
}

.knowledge-sidebar-header {
    gap: var(--space-3);
}

.knowledge-sidebar-header h2 {
    flex: 1;
}

.knowledge-create-limit {
    flex: 0 1 auto;
    padding: 0.45rem 0.65rem;
    font-size: var(--font-size-xs);
    line-height: 1.15;
    white-space: normal;
}

.knowledge-manager.sidebar-collapsed .knowledge-sidebar-header {
    justify-content: center;
    padding-inline: 0;
}

.knowledge-manager.sidebar-collapsed .knowledge-sidebar h2,
.knowledge-manager.sidebar-collapsed .knowledge-sidebar .exercise-version-actions,
.knowledge-manager.sidebar-collapsed .knowledge-sidebar-header .manager-icon,
.knowledge-manager.sidebar-collapsed .knowledge-sidebar .knowledge-create-limit,
.knowledge-manager.sidebar-collapsed .knowledge-sidebar .sidebar-search,
.knowledge-manager.sidebar-collapsed .knowledge-manage-categories,
.knowledge-manager.sidebar-collapsed .knowledge-list-status,
.knowledge-manager.sidebar-collapsed .knowledge-tree {
    display: none;
}

.knowledge-list-status {
    padding: 0.5rem 1.25rem;
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
}

.knowledge-tree {
    padding-inline: 0.75rem;
}

.knowledge-tree-item {
    display: block;
    width: 100%;
    border: 0;
    background: transparent;
    font: inherit;
    text-align: left;
}

.knowledge-tree .tree-count {
    margin-left: auto;
    color: var(--color-text-light);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
}

.knowledge-tree .tree-category-header.open .tree-count {
    color: var(--color-text-secondary);
}

.knowledge-tree-subcategory {
    margin-bottom: var(--space-1);
}

.knowledge-tree-subcategory-header {
    color: var(--color-text-secondary);
}

.knowledge-editor {
    min-width: 0;
    overflow-y: auto;
}

.knowledge-form-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-3);
}

.knowledge-form textarea {
    min-height: 150px;
}

.knowledge-id-category-row {
    grid-template-columns: minmax(150px, 0.35fr) 1fr;
}

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

.knowledge-section-heading h3 {
    margin-bottom: var(--space-2);
}

.knowledge-section-heading .form-hint {
    margin: 0;
}

.title-image-empty {
    padding: var(--space-5);
    border: 1px dashed var(--color-border-control);
    border-radius: var(--radius-control);
    color: var(--color-text-light);
    text-align: center;
}

.title-image-preview {
    display: grid;
    grid-template-columns: minmax(240px, 320px) minmax(0, 1fr);
    align-items: start;
    gap: var(--space-4);
}

.title-image-preview-media {
    position: relative;
    min-width: 0;
}

.title-image-preview img {
    width: 100%;
    height: 190px;
    display: block;
    padding: var(--space-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-control);
    background: var(--color-surface-muted);
    object-fit: contain;
}

.title-image-meta {
    display: grid;
    gap: var(--space-3);
}

.title-image-meta-row {
    display: grid;
    gap: var(--space-1);
    min-width: 0;
}

.title-image-meta-row > span:first-child {
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
}

.title-image-meta-row strong {
    overflow-wrap: anywhere;
}

.title-image-meta-row .badge {
    width: fit-content;
}

.knowledge-image-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    gap: var(--space-4);
}

.knowledge-image-card {
    display: flex;
    flex-direction: column;
    min-width: 0;
    overflow: hidden;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-control);
    background: var(--color-card);
}

.knowledge-image-card-preview {
    position: relative;
    background: var(--color-surface-muted);
}

.knowledge-image-card-preview img {
    width: 100%;
    height: 220px;
    display: block;
    padding: var(--space-2);
    border-bottom: 1px solid var(--color-border);
    object-fit: contain;
}

.knowledge-image-remove {
    position: absolute;
    top: var(--space-2);
    right: var(--space-2);
    z-index: 1;
    padding: 0.35rem 0.55rem;
    border-color: var(--color-border-control);
    background: var(--color-card);
    color: var(--color-danger);
    font-size: var(--font-size-xs);
    box-shadow: var(--shadow-card);
}

.knowledge-image-remove:hover {
    border-color: var(--color-danger);
    background: var(--color-card);
}

.knowledge-image-card-body {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    padding: var(--space-4);
}

.knowledge-image-source {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
}

.knowledge-image-field-label,
.knowledge-image-name-label {
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
}

.knowledge-image-name-label {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.knowledge-image-card-name {
    color: var(--color-text);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    overflow-wrap: anywhere;
}

.knowledge-image-card .input-control {
    width: 100%;
    min-width: 0;
    padding: 0.4rem 0.5rem;
    font-size: var(--font-size-sm);
}

.knowledge-image-alt-label {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
}

.knowledge-image-alt-label .knowledge-image-alt {
    color: var(--color-text);
    font-weight: var(--font-weight-normal);
}

.knowledge-image-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-top: var(--space-1);
}

.knowledge-image-actions .btn {
    flex: 1;
    padding: 0.35rem 0.5rem;
    font-size: var(--font-size-xs);
}

.knowledge-image-dialog {
    width: min(1180px, calc(100% - 2rem));
}

.knowledge-image-error {
    margin-bottom: var(--space-4);
}

.knowledge-image-dialog .knowledge-image-card {
    transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.knowledge-image-dialog .knowledge-image-card:hover {
    border-color: var(--color-action);
    transform: translateY(-2px);
}

.knowledge-preview-panel {
    min-width: 0;
    padding: var(--space-5);
    overflow-y: auto;
    border-left: 1px solid var(--color-border);
    background: var(--color-surface-muted);
}

.preview-controls {
    margin: 0 auto var(--space-4);
    max-width: 310px;
}

.preview-controls label {
    display: block;
    margin-bottom: var(--space-2);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
}

.phone-shell {
    width: min(100%, 320px);
    height: 650px;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    margin: 0 auto;
    padding: 12px;
    overflow: hidden;
    border: 8px solid var(--color-text-strong);
    border-radius: 38px;
    background: var(--color-text-strong);
    box-shadow: var(--shadow-dialog);
}

.phone-speaker {
    width: 72px;
    height: 5px;
    margin: 0 auto 10px;
    border-radius: 999px;
    background: var(--color-text-light);
}

.phone-screen {
    flex: 1;
    min-height: 0;
    overflow-x: hidden;
    overflow-y: auto;
    scrollbar-width: thin;
    overscroll-behavior: contain;
    border-radius: 24px;
    background: var(--color-card);
}

.preview-title-image {
    min-height: 190px;
    background: var(--color-surface-muted);
}

.preview-title-image img {
    width: 100%;
    height: 210px;
    display: block;
    object-fit: cover;
}

.preview-title-placeholder {
    padding-top: 82px;
    color: var(--color-text-light);
    text-align: center;
}

.preview-copy {
    padding: var(--space-4);
}

.preview-category {
    display: inline-block;
    margin-bottom: var(--space-2);
    color: var(--color-action);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
}

.preview-copy > h1 {
    margin: 0 0 var(--space-4);
    color: var(--color-text-strong);
    font-size: 1.65rem;
}

.preview-description > * {
    max-width: 100%;
}

.preview-description h1,
.preview-description h2,
.preview-description h3 {
    color: var(--color-text-strong);
}

.preview-description h1 { font-size: 1.45rem; }
.preview-description h2 { margin-top: 1.2rem; font-size: 1.2rem; }
.preview-description h3 { margin-top: 1rem; font-size: 1rem; }

.preview-description p,
.preview-description em,
.preview-description strong {
    display: block;
    margin: 0.65rem 0;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.6;
    white-space: pre-wrap;
}

.preview-bullet-list {
    margin: 0.65rem 0;
    padding-inline-start: 1.4rem;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.preview-description img {
    width: 100%;
    margin: var(--space-3) 0;
    border-radius: var(--radius-control);
}

.preview-video {
    display: block;
    margin: var(--space-3) 0;
    padding: var(--space-4);
    border-radius: var(--radius-control);
    background: var(--color-text-strong);
    color: var(--color-on-action);
    text-align: center;
}

#saveStatus[data-kind="error"] { color: var(--color-error); }
#saveStatus[data-kind="success"] { color: var(--color-success); }

.knowledge-manage-categories {
    width: calc(100% - (2 * var(--space-3)));
    margin: var(--space-3);
}

.knowledge-category-dialog {
    width: min(960px, calc(100% - (2 * var(--space-5))));
}

.knowledge-category-dialog-form {
    width: 100%;
    min-width: 0;
}

.knowledge-category-dialog .theme-dialog-header {
    padding-block: var(--space-4);
}

.knowledge-category-close {
    width: var(--icon-button-size);
    height: var(--icon-button-size);
    flex: 0 0 auto;
    padding: 0;
    border-radius: 50%;
}

.knowledge-category-editor {
    display: grid;
    gap: var(--space-4);
    overflow-x: hidden;
}

.knowledge-category-toolbar {
    display: grid;
    grid-template-columns: minmax(180px, 0.65fr) minmax(280px, 1.35fr) auto;
    gap: var(--space-3);
    align-items: end;
    padding: var(--space-4);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);
    background: var(--color-workspace);
}

.knowledge-category-toolbar label,
.knowledge-category-media label,
#knowledgeCategoryParentGroup {
    display: grid;
    gap: var(--space-2);
}

.knowledge-category-toolbar label,
.knowledge-category-translation > span,
.knowledge-category-media label,
#knowledgeCategoryParentGroup {
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-semibold);
}

.knowledge-category-parent-label {
    display: inline-flex;
    align-items: baseline;
    gap: var(--space-1);
    white-space: nowrap;
}

.knowledge-category-section {
    display: grid;
    gap: var(--space-3);
    min-width: 0;
    margin: 0;
    padding: var(--space-4);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);
}

.knowledge-category-section-heading {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--space-3);
}

.knowledge-category-section-heading h3,
.knowledge-category-section-heading p {
    margin: 0;
}

.knowledge-category-section-heading h3 {
    color: var(--color-text-strong);
    font-size: var(--font-size-lg);
}

.knowledge-category-section-heading p {
    color: var(--color-text-subtle);
    font-size: var(--font-size-sm);
    text-align: right;
}

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

.knowledge-category-translation {
    display: grid;
    gap: var(--space-2);
}

.knowledge-category-image-heading {
    margin-bottom: 0;
}

.custom-knowledge-title-image-preview {
    grid-template-columns: minmax(240px, 320px);
}

.knowledge-custom-image-card .knowledge-image-card-body {
    padding: var(--space-3);
}

.knowledge-custom-image-card .knowledge-image-actions {
    margin-top: 0;
}

.custom-knowledge-image-error {
    margin: 0;
    color: var(--color-danger);
    font-size: var(--font-size-sm);
}

.knowledge-category-image-alt {
    display: grid;
    gap: var(--space-2);
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-semibold);
}

#knowledgeCategoryStatus[data-kind="error"] { color: var(--color-error); }
#knowledgeCategoryStatus[data-kind="success"] { color: var(--color-success); }

#knowledgeCategoryStatus {
    min-height: 1.5em;
    margin: 0;
}

.knowledge-category-dialog .theme-dialog-actions .btn-danger:not(.hidden) {
    margin-right: auto;
}

@media (max-width: 1280px) {
    .knowledge-manager,
    .knowledge-manager.sidebar-collapsed {
        grid-template-columns: 280px minmax(500px, 1fr);
    }

    .knowledge-manager.sidebar-collapsed {
        grid-template-columns: 58px minmax(500px, 1fr);
    }

    .knowledge-preview-panel {
        grid-column: 2;
        border-top: 1px solid var(--color-border);
        border-left: 0;
    }
}

.knowledge-nutrition-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--space-3);
}

.knowledge-nutrition-grid label {
    display: grid;
    gap: var(--space-2);
}

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

.knowledge-preview-nutrition span {
    background: var(--color-surface-muted);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    display: grid;
    gap: 2px;
    padding: var(--space-2);
    text-align: center;
}

.knowledge-preview-nutrition small {
    color: var(--color-text-muted);
}

@media (max-width: 900px) {
    .knowledge-image-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 850px) {
    .knowledge-manager,
    .knowledge-manager.sidebar-collapsed {
        grid-template-columns: 1fr;
    }

    .knowledge-sidebar {
        max-height: 320px;
        border-bottom: 1px solid var(--color-border);
    }

    .knowledge-manager.sidebar-collapsed .knowledge-sidebar {
        max-height: 58px;
    }

    .knowledge-editor,
    .knowledge-preview-panel {
        grid-column: 1;
    }

    .knowledge-editor {
        padding: var(--space-5);
    }

    .title-image-preview {
        grid-template-columns: minmax(200px, 260px) minmax(0, 1fr);
    }
}

@media (max-width: 720px) {
    .knowledge-category-toolbar {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 620px) {
    .knowledge-nutrition-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .knowledge-image-grid,
    .title-image-preview {
        grid-template-columns: 1fr;
    }

    .knowledge-form-actions {
        align-items: stretch;
        flex-direction: column-reverse;
    }

    .knowledge-category-toolbar,
    .knowledge-category-translations {
        grid-template-columns: 1fr;
    }

    .knowledge-category-dialog {
        width: calc(100% - var(--space-4));
        max-height: calc(100vh - var(--space-4));
    }

    .knowledge-category-dialog-form {
        max-height: calc(100vh - var(--space-4));
    }

    .knowledge-category-dialog .theme-dialog-header,
    .knowledge-category-dialog .theme-dialog-body,
    .knowledge-category-dialog .theme-dialog-actions {
        padding-inline: var(--space-4);
    }

    .knowledge-category-section-heading {
        display: grid;
        gap: var(--space-1);
    }

    .knowledge-category-section-heading p {
        text-align: left;
    }

    .knowledge-category-dialog .theme-dialog-actions {
        flex-wrap: wrap;
    }
}

/* Exercise editor uses the same mobile preview as knowledge management. */
.exercise-manager { grid-template-columns: 340px minmax(520px, 1fr) 360px; }
.exercise-manager.sidebar-collapsed { grid-template-columns: 58px minmax(520px, 1fr) 360px; }
.exercise-preview-panel .preview-title-image img { object-fit: contain; }
@media (max-width: 1280px) {
    .exercise-manager { grid-template-columns: 280px minmax(0, 1fr); }
    .exercise-manager.sidebar-collapsed { grid-template-columns: 58px minmax(0, 1fr); }
    .exercise-preview-panel { grid-column: 2; }
}
@media (max-width: 900px) {
    .exercise-manager, .exercise-manager.sidebar-collapsed { grid-template-columns: minmax(0, 1fr); }
    .exercise-preview-panel { grid-column: 1; }
}

/* Constrain each workspace column so long lists and forms scroll independently. */
.exercise-manager > *,
.knowledge-manager > *,
.exercise-manager .sidebar-tree,
.knowledge-manager .sidebar-tree {
    min-height: 0;
}
.exercise-manager .sidebar-tree,
.knowledge-manager .sidebar-tree,
.exercise-manager > .detail-panel,
.knowledge-manager > .knowledge-editor,
.knowledge-preview-panel {
    overflow-y: auto;
    overscroll-behavior-y: contain;
}
.exercise-manager .sidebar > :not(.sidebar-tree),
.knowledge-manager .sidebar > :not(.sidebar-tree) {
    flex-shrink: 0;
}
@media (min-width: 901px) {
    /* The navigation can grow with zoom, translations and wrapped controls.
       Allocate its actual height before distributing the remaining viewport. */
    body.admin-editor-page {
        height: 100dvh;
        min-height: 0;
        display: flex;
        flex-direction: column;
        overflow: hidden;
    }
    body.admin-editor-page > :not(.exercise-manager):not(.knowledge-manager) {
        flex-shrink: 0;
    }
    .admin-editor-page > .exercise-manager,
    .admin-editor-page > .knowledge-manager {
        flex: 1 1 0;
        height: auto;
        min-height: 0;
        overflow: hidden;
        grid-template-rows: minmax(0, 1fr);
    }
}
@media (min-width: 901px) and (max-width: 1280px) {
    .exercise-manager,
    .knowledge-manager {
        grid-template-rows: minmax(0, 1fr) minmax(0, 1fr);
    }
    .exercise-manager > .sidebar,
    .knowledge-manager > .sidebar {
        grid-row: 1 / span 2;
    }
}
@media (max-width: 900px) {
    .exercise-manager > .detail-panel,
    .knowledge-manager > .knowledge-editor,
    .knowledge-preview-panel {
        max-height: calc(100dvh - var(--navigation-height));
    }
}