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#e8e8e8;border-radius:10px;padding:12px;font-size:13px}.action-group--undone{opacity:.5}.action-group-header{display:flex;justify-content:space-between;align-items:flex-start;gap:8px;margin-bottom:8px}.action-group-message{font-weight:500;color:#1a1a1a;line-height:1.4}.action-group-time{color:#aaa;font-size:11px;white-space:nowrap;flex-shrink:0;margin-top:2px}.action-list{list-style:none;display:flex;flex-direction:column;gap:4px}.action-item{display:flex;gap:6px;align-items:flex-start;color:#444}.action-item--undone{text-decoration:line-through;color:#aaa}.action-icon{flex-shrink:0;font-size:12px;margin-top:1px}.action-summary{line-height:1.4}.undo-btn{margin-top:10px;width:100%;padding:6px;background:none;border:1px solid #e0e0e0;border-radius:6px;font-size:12px;color:#555;cursor:pointer;transition:all 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