@media (max-width:1000px){

    .page-layout{
        flex-direction:column;
        align-items:stretch;
    }

    .sidebar{
        width:100%;
        position:relative;
        top:auto;
    }

    /* Ensure main content expands properly */
    .main-content{
        width:100%;
        max-width:100%;
    }

}