.seui-group {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.seui-group.hide {
    display: none;
}

.seui-group-header {
    font-family: var(--seui-view-text-style);
    font-size: var(--seui-view-text-size);
    font-weight: 600;
    color: var(--seui-view-text-color);
    padding: 8px 12px;
    background-color: var(--seui-view-optgroup-background-color);
    border-radius: var(--seui-option-border-radius);
    /* position: sticky; */
    /* top: 0; */
    z-index: 1;
    cursor: pointer;
    user-select: none;
    
    display: flex;
    align-items: center;
    gap: 8px;
}

.seui-group-header::before {
    content: "";
    display: inline-block;
    width: 0;
    height: 0;
    border-top: 5px solid transparent;
    border-bottom: 5px solid transparent;
    border-left: 7px solid currentColor;
    transition: transform 200ms ease;
    transform: rotate(90deg);
}

.seui-group.collapsed .seui-group-header::before {
    transform: rotate(0deg);
}

.seui-group-items {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding-left: 16px;
}

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

/* Option trong group có indent nhẹ hơn */
.seui-group-items .seui-option-view {
    padding-left: 12px;
    border-left: 2px solid #e0e0e0;
    margin-left: 4px;
}