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button.danger{color:var(--error)}.message-label.draggable{pointer-events:auto;cursor:grab;-webkit-user-select:none;user-select:none}.message-label.dragging{cursor:grabbing;opacity:.85}.participant-node{flex-direction:column;align-items:center;display:flex}.participant-head{background:var(--node-fill);border:1.5px solid var(--node-stroke);border-radius:var(--r-lg);text-align:center;justify-content:center;align-items:center;gap:8px;min-width:130px;padding:12px 18px;font-size:12.5px;display:flex}.participant-head.selected{border-color:var(--selected)}.actor-icon{color:var(--node-stroke);flex:none}.lifeline{border-left:1.5px dashed var(--border);width:0}.parallel-label{border-radius:var(--r);pointer-events:none;padding:1px 6px;font-size:11px;position:absolute}.message-label{background:var(--bg);color:var(--text);border-radius:var(--r);pointer-events:none;padding:1px 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