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var(--accent)}.tree-node.multi-selected{background:rgba(79,142,247,.1);outline:rgba(79,142,247,.4) solid 1px}.tree-node.selected.multi-selected{background:rgba(79,142,247,.2);outline:1px solid var(--accent)}.tree-node.drop-target{background:rgba(79,142,247,.2);outline:1px solid var(--accent);color:var(--accent)}.tree-empty{display:flex;flex-direction:column;align-items:center;gap:6px;padding:32px 16px;color:var(--text-muted);font-size:13px;text-align:center;user-select:none}.tree-empty-icon{font-size:32px}.tree-empty-hint{font-size:11px;opacity:.7}.tree-empty-hint strong{color:var(--text);font-weight:600}.tree-empty-quickstart{display:flex;flex-direction:column;gap:10px;width:100%;max-width:220px;margin-top:8px;text-align:left}.tree-empty-qs-item{display:flex;align-items:flex-start;gap:10px;width:100%;padding:10px 12px;background:var(--surface);border:1px solid 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0;height:0}.diagram-element-layer-locked-toast,.diagram-group-no-movable-toast,.diagram-layer-locked-toast,.diagram-pick-invalid-toast,.diagram-pick-toast,.diagram-readonly-toast,.editor-readonly-toast,.ht-readonly-toast{position:absolute;top:12px;left:50%;transform:translateX(-50%);background:var(--surface);border:1px solid var(--danger);color:var(--text);font-size:12px;font-family:var(--font);padding:7px 16px;border-radius:var(--radius);box-shadow:0 4px 12px rgba(0,0,0,.32);white-space:nowrap;pointer-events:none;opacity:0;transition:opacity .2s;z-index:10}.diagram-pick-toast{border-color:var(--accent)}.diagram-element-layer-locked-toast.visible,.diagram-group-no-movable-toast.visible,.diagram-layer-locked-toast.visible,.diagram-pick-invalid-toast.visible,.diagram-pick-toast.visible,.diagram-readonly-toast.visible,.editor-readonly-toast.visible,.ht-readonly-toast.visible{opacity:1}.app-toast{position:fixed;top:72px;left:50%;transform:translateX(-50%);max-width:min(520px,calc(100vw - 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