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textarea:focus{border-color:var(--accent);outline:none}.mobile-back-btn,.mobile-header-title{display:none}@media (width<=768px){.main-body{position:relative}.folder-pane,.message-list,.reading-pane,.chat-view{display:none}.main-body.mobile-pane-nav .folder-pane{width:100%;display:flex}.main-body.mobile-pane-list .message-list{border-right:none;width:100%;display:block}.main-body.mobile-pane-detail .reading-pane{width:100%;padding:16px;display:block}.main-body.mobile-pane-detail .chat-view{width:100%;display:flex}.reading-toolbar{flex-wrap:wrap}.thread-meta{flex-wrap:wrap;gap:4px 16px}.mobile-back-btn{flex-shrink:0;font-size:22px}.mobile-header-title{text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0;font-size:15px;font-weight:600;overflow:hidden}.topbar[data-mobile-pane=list] .brand,.topbar[data-mobile-pane=detail] .brand,.topbar[data-mobile-pane=list] .search,.topbar[data-mobile-pane=detail] .search{display:none}.topbar[data-mobile-pane=list] 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