body {
    font-family: "Calibri", system-ui, -apple-system, sans-serif;
    background: #fafafa;
    color: #111;
    margin: 0;
    padding: 24px;
}
.container {
    max-width: 900px;
    margin: 0 auto;
}
h1 {
    margin: 0 0 12px;
    font-size: 26px;
}
.tree {
    list-style: none;
    padding-left: 0;
    margin: 0;
}
.branch {
    margin: 4px 0;
}
.branch > .row {
    display: flex;
    align-items: center;
    gap: 6px;
}
.toggle {
    border: none;
    background: none;
    cursor: pointer;
    font-size: 14px;
    line-height: 1;
    width: 1.5em;
    height: 1.5em;
    padding: 0;
}
.label {
    font-weight: 600;
}
.children {
    margin: 6px 0 0 22px;
    padding-left: 12px;
    border-left: 1px dashed #cfcfcf;
}
.branch.collapsed > .children {
    display: none;
}
.leaf {
    margin-left: 22px;
    list-style: disc;
}
a {
    color: #1d4ed8;
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}
.note {
    margin-top: 24px;
    color: #444;
}