ul.tt_category {
    -webkit-font-smoothing: none;
    font-size: 0.9em
}


ul.tt_category {
    background: #fff;
    box-shadow: inset -1px -1px #fff, inset 1px 1px grey, inset -2px -2px #dfdfdf, inset 2px 2px #0a0a0a;
    display: block;
    margin: 0;
    padding: 6px;
}

ul.tt_category li {
    list-style-type: none
}

ul.tt_category a {
    color: #000;
    text-decoration: none
}

ul.tt_category a:focus {
    background-color: navy;
    color: #fff
}

ul.tt_category li,
ul.tt_category ul {
    margin-top: 3px
}

ul.tt_category ul {
    border-left: 1px dotted grey;
    margin-left: 16px;
    padding-left: 16px
}

ul.tt_category ul>li {
    position: relative
}

ul.tt_category ul>li:before {
    border-bottom: 1px dotted grey;
    content: "";
    display: block;
    left: -16px;
    position: absolute;
    top: 6px;
    width: 12px
}

ul.tt_category ul>li:last-child:after {
    background: #fff;
    bottom: 0;
    content: "";
    display: block;
    left: -20px;
    position: absolute;
    top: 7px;
    width: 8px
}

ul.tt_category details {
    margin-top: 0
}

ul.tt_category details[open] summary {
    margin-bottom: 0
}

ul.tt_category ul details>summary:before {
    margin-left: -22px;
    position: relative;
    z-index: 1
}

ul.tt_category details>summary:before {
    background-color: #fff;
    border: 1px solid grey;
    content: "+";
    display: block;
    float: left;
    height: 9px;
    line-height: 8px;
    margin-right: 5px;
    padding-left: 1px;
    text-align: center;
    width: 8px
}

ul.tt_category details[open]>summary:before {
    content: "-"
}

ul.tt_category details>summary::-webkit-details-marker,
ul.tt_category details>summary::marker {
    content: ""
}