/* Custom styling for section titles (part titles) in sidebar */
.chapter li.part-title {
    font-weight: bold;
    font-size: 1.2em;
    color: var(--sidebar-fg);
    background: var(--sidebar-bg);
    border-top: 1px solid var(--sidebar-spacer);
    border-bottom: 1px solid var(--sidebar-spacer);
    padding: 0.7em 0.8em;
    margin: 0.8em 0 0.5em 0;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.85em;
    border-radius: 3px;
}
/* .chapter li.part-title {
    font-weight: bold;
    font-size: 1.1em;
    color: var(--sidebar-fg);
    background: var(--sidebar-bg);
    border-top: 1px solid var(--sidebar-spacer);
    padding-top: 0.5em;
    margin-top: 0.5em;
} */

/* Ensure part titles are not clickable and look distinct */
.chapter li.part-title {
    cursor: default;
    user-select: none;
}

/* Add some spacing after part titles */
.chapter li.part-title + li {
    margin-top: 0.3em;
}

/* Style regular chapter items under part titles */
.chapter li:not(.part-title) {
    margin-left: 0.5em;
}