/* Highlight only the top-level current sidebar link in Alabaster theme */
div.sphinxsidebarwrapper .toctree-l1.current > a {
    background-color: #e0eaff;
    color: #003366 !important;
    font-weight: bold;
    border-radius: 4px;
}
/* Add spacing and a subtle border between sidebar links */
div.sphinxsidebarwrapper a {
    display: block;
    margin-bottom: 12px;
    padding-bottom: 4px;
    border-bottom: 1px solid #ddd;
}