.start-end-node-help{background:linear-gradient(135deg,#f0f9ff,#e0f2fe);border-left:4px solid #0ea5e9;border-radius:0 6px 6px 0;box-shadow:0 1px 3px rgba(0,0,0,.05);color:#334155;display:none;font-size:16px;line-height:1.5;margin-top:10px;padding:12px 16px}.start-end-node-help.active{animation:fadeIn .3s ease;display:block}