treehouse/static/css/tree.css

.tree ul {
    padding-left: clamp(12px, 2vw, 24px);
}

.tree>ul {
    padding-left: 0;
}

.tree {
    --tree-icon-position: 8px 50%;
    --tree-icon-space: 28px;

    /* I have no clue why this works, deal with it */
    --tree-hover-expansion: 6px;

    position: relative;
}

.tree details>summary {
    list-style: none;
    cursor: pointer;
}

/* Can webkit not be a dick for once? */
.tree details>summary::-webkit-details-marker {
    display: none;
}

.tree li {
    list-style: none;

    display: flex;
    flex-direction: row;

    position: relative;
}

.tree li>*:first-child {
    width: 100%;
}

.tree li>div:first-child {
    box-sizing: border-box;
}

.tree li>div:first-child,
.tree li>details>summary:first-child {
    padding-right: 32px;
}

.tree li[is="th-linked-branch"]>details>summary:first-child {
    padding-right: 56px;
}

.tree li>div:first-child:hover {
    border-bottom: 1px solid var(--border-1);
    margin-bottom: -1px;
}

.tree details>summary {
    background-image:
        /* expand */
        url('data:image/svg+xml;base64,PHN2ZyBoZWlnaHQ9IjEyIiB3aWR0aD0iMTIiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyI+PHBhdGggY2xpcC1ydWxlPSJldmVub2RkIiBkPSJtNyA1di0zaC0ydjNoLTN2MmgzdjNoMnYtM2gzdi0yeiIgZmlsbD0iIzU1NDIzZSIgZmlsbC1vcGFjaXR5PSIuNSIgZmlsbC1ydWxlPSJldmVub2RkIi8+PC9zdmc+');
    background-repeat: no-repeat;
    background-position: var(--tree-icon-position);
    padding-left: var(--tree-icon-space);
    margin-left: calc(- var(--tree-icon-space));

    padding-top: var(--tree-hover-expansion);
    padding-bottom: var(--tree-hover-expansion);
    border-radius: 8px;

    background-color: transparent;
}

.tree details>summary:hover {
    background-color: var(--shaded-background);
}

.tree li>div {
    background-image:
        /* leaf */
        url('data:image/svg+xml;base64,PHN2ZyBoZWlnaHQ9IjEyIiB3aWR0aD0iMTIiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyI+PGNpcmNsZSBjeD0iNiIgY3k9IjYiIGZpbGw9IiM1NTQyM2UiIGZpbGwtb3BhY2l0eT0iLjUiIHI9IjIiLz48L3N2Zz4=');
    background-repeat: no-repeat;
    background-position: var(--tree-icon-position);
    padding-left: var(--tree-icon-space);
    margin-left: calc(- var(--tree-icon-space));
    padding-top: var(--tree-hover-expansion);
    padding-bottom: var(--tree-hover-expansion);
}

.tree details[open]>summary {
    background-image:
        /* collapse */
        url('data:image/svg+xml;base64,PHN2ZyBoZWlnaHQ9IjEyIiB3aWR0aD0iMTIiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyI+PHBhdGggZD0ibTMgNmg2IiBzdHJva2U9IiM1NTQyM2UiIHN0cm9rZS1vcGFjaXR5PSIuNSIgc3Ryb2tlLXdpZHRoPSIyIi8+PC9zdmc+');
}

.tree details:not([open])>summary>.branch-summary>:last-child::after {
    content: '';
    display: inline-block;

    background-image:
        /* more */
        url('data:image/svg+xml;base64,PHN2ZyBoZWlnaHQ9IjE2IiB3aWR0aD0iMTYiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyI+PHBhdGggZD0ibTQgNiA0IDQgNC00IiBmaWxsPSJub25lIiBzdHJva2U9IiM1NTQyM2UiIHN0cm9rZS1vcGFjaXR5PSIuNSIgc3Ryb2tlLXdpZHRoPSIyIi8+PC9zdmc+');
    background-repeat: no-repeat;
    background-position: 50% 50%;

    width: 16px;
    height: 1.2em;

    vertical-align: text-bottom;
    margin-left: 0.5em;
}

@media (hover: none) {

    .tree li>div:first-child,
    .tree li>details>summary:first-child {
        border-bottom: 1px solid var(--border-1);
    }

    .tree details>summary {
        border-radius: 0px;
    }
}


.tree th-bb {
    height: 24px;
    margin: 4px;

    position: absolute;
    top: 0;
    right: 0;

    display: flex;
    flex-direction: row;

    opacity: 0%;
}


.tree li>details>summary:hover>th-bb,
.tree li>div:hover>th-bb {
    opacity: 100%;
}

@media (hover: none) {
    .tree th-bb {
        opacity: 100%;
    }
}

.tree .icon {
    background-repeat: no-repeat;
    background-position: 50% 50%;
    opacity: 35%;

    width: 24px;
    height: 24px;
}


.tree .icon-permalink {
    background-image:
        /* permalink */
        url("data:image/svg+xml;base64,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");
}

.tree .icon-go {
    background-image:
        /* go */
        url("data:image/svg+xml;base64,PHN2ZyBoZWlnaHQ9IjE2IiB3aWR0aD0iMTYiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyI+PHBhdGggZD0ibTEwLjU4NTggNy0yLjI5Mjg5LTIuMjkyODkgMS40MTQyMS0xLjQxNDIyIDQuNzA3MDggNC43MDcxMS00LjcwNzA4IDQuNzA3MS0xLjQxNDIxLTEuNDE0MiAyLjI5Mjg5LTIuMjkyOWgtNy41ODU4di0yeiIgZmlsbD0iIzU1NDIzZSIvPjwvc3ZnPg==");
}

.tree a.navigate {
    background-repeat: no-repeat;
    background-position: 0 50%;
    opacity: 50%;
    color: #000;
    padding-left: 20px;
}

.tree .link-loading {
    padding-left: 24px;
    opacity: 50%;
}

.tree :target>details>summary,
.tree :target>div {
    border-bottom: 1px dashed var(--border-2);
    margin-bottom: -1px;
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
}

@media (prefers-color-scheme: dark) {
    .tree details>summary {
        background-image:
            /* expand */
            url('data:image/svg+xml;base64,PHN2ZyBoZWlnaHQ9IjEyIiB3aWR0aD0iMTIiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyI+PHBhdGggY2xpcC1ydWxlPSJldmVub2RkIiBkPSJtNyA1di0zaC0ydjNoLTN2MmgzdjNoMnYtM2gzdi0yeiIgZmlsbD0iI2Q3Y2RiZiIgZmlsbC1vcGFjaXR5PSIuNSIgZmlsbC1ydWxlPSJldmVub2RkIi8+PC9zdmc+');
    }

    .tree li>div {
        background-image:
            /* leaf */
            url('data:image/svg+xml;base64,PHN2ZyBoZWlnaHQ9IjEyIiB3aWR0aD0iMTIiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyI+PGNpcmNsZSBjeD0iNiIgY3k9IjYiIGZpbGw9IiNkN2NkYmYiIGZpbGwtb3BhY2l0eT0iLjUiIHI9IjIiLz48L3N2Zz4=');
    }

    .tree details[open]>summary {
        background-image:
            /* collapse */
            url('data:image/svg+xml;base64,PHN2ZyBoZWlnaHQ9IjEyIiB3aWR0aD0iMTIiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyI+PHBhdGggZD0ibTMgNmg2IiBzdHJva2U9IiNkN2NkYmYiIHN0cm9rZS1vcGFjaXR5PSIuNSIgc3Ryb2tlLXdpZHRoPSIyIi8+PC9zdmc+');
    }

    .tree .icon-permalink {
        background-image:
            /* permalink */
            url("data:image/svg+xml;base64,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");
    }

    .tree .icon-go {
        background-image:
            /* go */
            url("data:image/svg+xml;base64,PHN2ZyBoZWlnaHQ9IjE2IiB3aWR0aD0iMTYiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyI+PHBhdGggZD0ibTEwLjU4NTggNy0yLjI5Mjg5LTIuMjkyODkgMS40MTQyMS0xLjQxNDIyIDQuNzA3MDggNC43MDcxMS00LjcwNzA4IDQuNzA3MS0xLjQxNDIxLTEuNDE0MiAyLjI5Mjg5LTIuMjkyOWgtNy41ODU4di0yeiIgZmlsbD0iI2Q3Y2RiZiIvPjwvc3ZnPg==");
    }

    .tree details:not([open])>summary>.branch-summary>:last-child::after {
        background-image:
            /* more */
            url('data:image/svg+xml;base64,PHN2ZyBoZWlnaHQ9IjE2IiB3aWR0aD0iMTYiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyI+PHBhdGggZD0ibTQgNiA0IDQgNC00IiBmaWxsPSJub25lIiBzdHJva2U9IiNkN2NkYmYiIHN0cm9rZS1vcGFjaXR5PSIuNSIgc3Ryb2tlLXdpZHRoPSIyIi8+PC9zdmc+');
    }
}