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solid var(--border);background:var(--surface);color:var(--text);font:inherit;font-size:13px;font-weight:600;cursor:pointer}.phist-listbtn:hover{border-color:color-mix(in srgb,var(--accent) 45%,var(--border))}.phist-list-backdrop{display:none}@media (max-width:768px){.phist-mobile-toolbar{display:flex}.phist-convo-pane{flex:1 1}.phist-list-pane{position:fixed;top:0;left:0;height:100vh;width:82vw;max-width:340px;z-index:130;transform:translateX(-100%);transition:transform .25s ease;border-right:1px solid var(--border)}.portal-history-split.list-open .phist-list-pane{transform:translateX(0)}.phist-list-backdrop.show{display:block;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:125}}