.toc-sidebar {
    position: fixed;
    left: 1rem;
    max-width: min(20%, 20rem);
    overflow-y: auto;
    font-size: 0.75rem;
    line-height: 1.4;
    z-index: 10;
}

.toc-sidebar ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.toc-sidebar li {
    margin-bottom: 0.3em;
}

.toc-sidebar li.toc-h3 {
    padding-left: 1em;
}

.toc-sidebar a {
    color: var(--theme-text);
    opacity: 0.45;
    text-decoration: none;
    transition: opacity 0.2s;
}

.toc-sidebar a:hover {
    opacity: 0.8;
}

.toc-sidebar a.active {
    opacity: 1;
    font-weight: 600;
}

@media (max-width: 760px) {
    .toc-sidebar {
        display: none;
    }
}