.part-tree {
    margin-top: 28px;
    padding: 24px 0;
    border: 1px solid var(--line);
    border-radius: 6px;
}
.part-tree h2 {
    font-size: 20px;
    padding: 0 22px 20px;
    border-bottom: 1px solid var(--line);
}
#part-tree-content {
    font-size: 13px;
}
#part-tree-content:empty {
    padding: 20px;
}
#part-tree-content[role="status"] {
    padding-top: 18px;
}
.part-tree .tree-group {
    border-bottom: 1px solid var(--line);
}
.part-tree .tree-group:last-child {
    border-bottom: 0;
}
.tree-heading {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    border: 0;
    padding: 15px 22px;
    background: white;
    text-align: left;
}
.tree-heading:hover,
.tree-heading:focus-visible,
.tree-heading[aria-expanded="true"] {
    background: var(--pale);
    color: var(--blue);
}
.tree-icon {
    position: relative;
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}
.tree-icon::before,
.tree-icon::after {
    content: "";
    position: absolute;
    left: 3px;
    top: 7px;
    width: 10px;
    height: 1px;
    background: currentColor;
}
.tree-icon::after {
    transform: rotate(90deg);
}
.tree-heading[aria-expanded="true"] .tree-icon::after {
    transform: rotate(0);
}
.tree-heading.is-loading .tree-icon {
    border: 2px solid #c9dce9;
    border-top-color: var(--blue);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
.tree-heading.is-loading .tree-icon::before,
.tree-heading.is-loading .tree-icon::after {
    display: none;
}
.tree-parts {
    padding: 12px 22px;
}
.tree-parts a {
    display: block;
    padding: 9px 10px;
    margin-bottom: 4px;
    border-bottom: 1px solid var(--line);
}
.tree-parts a:hover,
.tree-parts a:focus-visible {
    color: var(--blue);
    background: var(--pale);
}
.tree-parts button {
    display: block;
    padding: 6px 12px;
    border: 1px solid var(--line);
    background: white;
    color: var(--blue);
    margin-top: 10px;
}
.tree-parts button:hover,
.tree-parts button:focus-visible {
    border-color: var(--blue);
}
@media (max-width: 820px) {
    .part-tree {
        margin-top: 20px;
    }
}