.diagram-canvas-host {
    position: relative;
    width: 100%;
    min-height: 400px;
    background: var(--mud-palette-background-gray);
    border: 1px solid var(--mud-palette-lines-default);
    border-radius: 4px;
    overflow: auto;
    flex: 1 1 auto;
}

.diagram-authoring-shell {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    min-height: 480px;
}

.diagram-authoring-shell--editing .diagram-canvas-host {
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
}

.converged-diagram-tools-dock {
    position: sticky;
    bottom: 0;
    z-index: 10;
    width: 100%;
    margin-top: 0;
    padding-bottom: env(safe-area-inset-bottom, 0px);
    border-radius: 12px 12px 0 0;
    background: var(--mud-palette-surface);
    border: 1px solid var(--mud-palette-lines-default);
    border-top: none;
    box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.1);
    box-sizing: border-box;
}

.diagram-canvas-tools-drawer-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    min-height: 48px;
    padding: 8px 12px 10px;
    box-sizing: border-box;
}

.diagram-stage {
    position: relative;
    width: 100%;
}

.diagram-page-frame {
    position: relative;
    width: 100%;
    line-height: 0;
}

.diagram-pdf-container {
    position: relative;
    width: 100%;
}

.diagram-pdf-container:not(:has(.diagram-pdf-page)) {
    aspect-ratio: 612 / 792;
    min-height: 120px;
}

.diagram-overlay-layer {
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
}

.diagram-overlay-layer.edit-mode {
    pointer-events: auto;
    cursor: default;
}

.diagram-overlay-layer.edit-mode.draw-tool-active {
    cursor: crosshair;
}

.diagram-overlay-box {
    position: absolute;
    box-sizing: border-box;
    border: 2px solid var(--mud-palette-primary);
    background: rgba(var(--mud-palette-primary-rgb), 0.12);
    pointer-events: auto;
    cursor: pointer;
    overflow: hidden;
}

.diagram-overlay-box.view-box {
    border-color: var(--mud-palette-secondary);
    background: rgba(var(--mud-palette-secondary-rgb), 0.12);
}

.diagram-overlay-box.selected {
    border-width: 3px;
    box-shadow: 0 0 0 2px rgba(var(--mud-palette-primary-rgb), 0.35);
}

.diagram-overlay-box.view-box.selected {
    box-shadow: 0 0 0 2px rgba(var(--mud-palette-secondary-rgb), 0.35);
}

.diagram-overlay-label {
    font-size: 11px;
    line-height: 1.2;
    padding: 2px 4px;
    color: var(--mud-palette-text-primary);
    background: rgba(255, 255, 255, 0.85);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.diagram-overlay-box.edit-mode {
    cursor: move;
}

.diagram-overlay-resize-handle {
    position: absolute;
    right: 0;
    bottom: 0;
    width: 12px;
    height: 12px;
    background: var(--mud-palette-primary);
    cursor: se-resize;
    z-index: 2;
}

.diagram-draft-rect {
    position: absolute;
    border: 2px dashed var(--mud-palette-primary);
    background: rgba(var(--mud-palette-primary-rgb), 0.08);
    pointer-events: none;
}

.diagram-interaction-capture {
    position: fixed;
    inset: 0;
    z-index: 1300;
    cursor: inherit;
    background: transparent;
    touch-action: none;
}

.diagram-pdf-page {
    display: block;
}

.diagram-folder-hierarchy .mud-expand-panel,
.diagram-folder-nested .mud-expand-panel {
    border-left: 2px solid var(--mud-palette-lines-default);
    margin-left: 4px;
}

.diagram-folder-nested {
    margin-left: 8px;
    padding-left: 4px;
}

.diagram-folder-hierarchy .mud-table,
.diagram-folder-nested .mud-table {
    margin-top: 4px;
}

.diagram-list .diagram-list-item {
    border: 1px solid var(--mud-palette-lines-default);
    border-radius: 4px;
    background: var(--mud-palette-surface);
    cursor: pointer;
}

.diagram-list .diagram-list-item:hover {
    background: var(--mud-palette-action-default-hover);
}