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640px){.sidebar-header{height:auto;padding:12px}.avatar-wrap{width:36px;height:36px}.messages{padding:8px}.bubble{max-width:min(520px,85vw)}.bubble-img{max-width:min(320px,85vw);height:auto}.chat-header{padding:12px;height:auto;justify-content:flex-start;border-bottom:1px solid var(--border-color)}.thread-item{padding:12px}.chat-title{min-width:0;flex:1}.chat-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-actions{order:2}.chat-menu{order:3;margin-left:auto}}