:root {
    --sidebar-target-width: 332px;
}

.sidebar {
    border-inline-end: 1px solid color-mix(in srgb, var(--sidebar-fg) 12%, transparent);
}

.sidebar .sidebar-scrollbox {
    padding: 14px 8px 32px;
}

.chapter,
.section {
    line-height: 1.45;
}

.chapter li.chapter-item,
.chapter li.header-item {
    margin-block: 1px;
    line-height: 1.45;
}

.chapter li.part-title {
    margin: 22px 12px 8px;
    font-size: 0.75rem;
    font-weight: 650;
    letter-spacing: 0.12em;
    color: color-mix(in srgb, var(--sidebar-fg) 58%, var(--sidebar-active));
}

.chapter-link-wrapper {
    align-items: center;
    margin-inline: 4px;
    border-radius: 9px;
    transition: background-color 0.16s ease;
}

.chapter-link-wrapper:hover,
.chapter-link-wrapper:has(> a.active) {
    background: color-mix(in srgb, var(--sidebar-fg) 8%, transparent);
}

.chapter-link-wrapper:has(> a.active) {
    background: color-mix(in srgb, var(--sidebar-active) 16%, transparent);
}

.chapter li a:not(.chapter-fold-toggle),
.chapter-link-wrapper > span {
    flex: 1;
    min-width: 0;
    padding: 6px 8px;
    border-radius: 9px;
}

.chapter-link-wrapper > span {
    cursor: pointer;
}

.chapter li a {
    transition: color 0.16s ease;
}

.chapter-fold-toggle {
    display: grid;
    place-items: center;
    width: 26px;
    height: 26px;
    margin-inline: 2px 4px;
    padding: 0;
    border-radius: 8px;
    opacity: 0.45;
    transition: opacity 0.16s ease, background-color 0.16s ease;
}

.chapter-fold-toggle:hover {
    opacity: 1;
    background: color-mix(in srgb, var(--sidebar-fg) 10%, transparent);
}

.chapter-fold-toggle div {
    transition: transform 0.18s ease;
    font-size: 0.8em;
}

.section {
    margin-inline-start: 14px;
    padding-inline-start: 8px;
    border-inline-start: 1px solid color-mix(in srgb, var(--sidebar-fg) 16%, transparent);
}

.chapter .spacer {
    width: auto;
    height: 1px;
    margin: 12px 14px;
    background: color-mix(in srgb, var(--sidebar-fg) 14%, transparent);
}