.container{display:flex;height:100vh;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;color:#333;background-color:#f9f9f9}.main-content{display:flex;flex-direction:row;align-items:flex-start;gap:0rem;height:calc(50vh - 80px);min-width:0}.sidebar{width:300px;background-color:#fff;padding:1rem;border-right:1px solid #e0e0e0}.sidebar-item .icon-btn{line-height:12px;padding:6px}.sidebar-item{position:relative;width:208px;padding:.8rem;margin-bottom:.5rem;border-radius:8px;background-color:#f2f2f2;color:#333;cursor:pointer;transition:background-color .5s}.sidebar-item .hover-actions{display:none;position:absolute;top:20px;left:0;transform:translateY(-50%);background-color:transparent;border-radius:4px;box-shadow:none;z-index:10}.sidebar-item:hover .hover-actions{display:flex}.sidebar-item .hover-actions .icon-btn{line-height:12px;padding:6px;margin:0 4px;cursor:pointer;color:#666;border:none;background:none;transition:color .3s,background-color .3s}.sidebar-item.selected{background-color:#d0d0d0;border-left:4px solid #4a90e2;color:#000}.main-content{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;position:relative;padding:1rem}.user-menu{position:absolute;top:1.5rem;right:2rem;cursor:pointer;color:#555}.dropdown{position:absolute;top:2.5rem;right:0;background-color:#fff;border:1px solid #e0e0e0;border-radius:8px;box-shadow:0 4px 8px #0000001a;display:none;width:180px;z-index:100;overflow:hidden}.dropdown-item{padding:.8rem;color:#333;cursor:pointer;transition:background-color .2s}.dropdown-item:hover{background-color:#f2f2f2}.search-area{width:100%;max-width:600px;text-align:center;padding:1rem}input{width:100%;padding:.8rem 1rem;font-size:1rem;border-radius:8px;border:1px solid #e0e0e0;background-color:#fff;color:#333;outline:none;transition:border-color .2s}input:focus{border-color:#4a90e2}.sidebar{width:260px;background-color:#fff;padding:1rem;border-right:1px solid #e0e0e0;transition:width .3s ease;text-align:right}.sidebar.collapsed{width:60px;padding:.5rem}.sidebar-header{display:flex;flex-direction:column;gap:.5rem;margin-bottom:1rem}.collapse-btn,.new-chat-btn{background-color:#4a90e2;color:#fff;border:none;border-radius:8px;padding:.5rem;cursor:pointer;font-size:.9rem;transition:background-color .2s}.collapse-btn:hover,.new-chat-btn:hover{background-color:#3a7ac2}.sidebar h3{color:#333;font-size:1.2rem;margin-bottom:1rem;font-weight:600}.sidebar-item{padding:.8rem;margin-bottom:.5rem;border-radius:8px;background-color:#f2f2f2;color:#333;cursor:pointer;transition:background-color .2s}.sidebar-item:hover{background-color:#e0e0e0}