/* Collapsible edge group styling */
.edge-group-header {
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.3rem 0.4rem;
    background: #f5f8fa;
    border-radius: 3px;
    font-weight: 600;
    transition: background 0.15s;
}

.edge-group-header:hover {
    background: #ebf1f5;
}

.edge-group-header .chevron {
    font-size: 0.8rem;
    transition: transform 0.2s;
}

.edge-group-header.collapsed .chevron {
    transform: rotate(-90deg);
}

.edge-group-items {
    margin-top: 0.3rem;
    margin-left: 0.8rem;
    display: grid;
    gap: 0.25rem;
}

.edge-group-items.collapsed {
    display: none;
}