ul {
    position: relative;
    padding-right: 24px;
    margin: 10px 20px;
    &:before {
        content: '';
        position: absolute;
        top:0;
        right:-15px;
        height:100%;
        border-right: 1px dashed #ddd;
    }
    ul {margin: 0;}
    li:not(.open)>treeview>ul {display: none;}
}
li {
    position: relative;
    white-space: nowrap;
    list-style-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABHNCSVQICAgIfAhkiAAAAAlwSFlzAAAD0QAAA9EBmIqJtAAAABl0RVh0U29mdHdhcmUAd3d3Lmlua3NjYXBlLm9yZ5vuPBoAAACMSURBVDiNY/y/ioH5gagCKwMaUOB98JfB+P9vdHF0wPh6l9htBgYGFSxyHxmZ/2oLO715is8AJhyaGRgYGPj//WUSJcYF//HI32JgYPiOR/tNFgIWqOGX/q/PwsjMcZyAIXgBC7OgjiUlBjBRonnUgEFkAOMd8rUz3mERuMOl8UD0NUZ2JgYovBb9DQD9OR9CnnG4BgAAAABJRU5ErkJggg==');
    &:before {
        content: '';
        position: absolute;
        top:9px;
        right:-40px;
        width:15px;
        height: 0;
        border-bottom: 1px dashed #ddd;
    }
    
    .toggle {
        position: absolute;
        top:3px;
        right:-45px;
        font-size: 15px;
        color:#949494;
        &:before {
            content: '+';
            position: absolute;
            top:0;
            right:0;
            width:12px;
            height:12px;
            display: flex;
            flex-direction: row;
            align-items: center;
            justify-content: center;
            border-radius: 4px;
            background-color: #fff;
            border: 1px solid #ddd;
        }
    }
    .text {
        display: block;
        font-size: 14px;
        &:hover {background-color: rgba(150, 150, 150, 0.1);}
    }
    &.open {
        list-style-image: url('data:image/png;base64,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');
        >.toggle:before {content:'-';}
    }
    &.file {
        list-style-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAMAAAAoLQ9TAAAAA3NCSVQICAjb4U/gAAAACXBIWXMAAAPRAAAD0QGYiom0AAAAGXRFWHRTb2Z0d2FyZQB3d3cuaW5rc2NhcGUub3Jnm+48GgAAAEtQTFRF////5NfJ3NzB7ejb3tnE19O71M+2zsmu0s2z2dS929fB3NjD4N3I4t/L49/M5ODN5eLP5uPQ5+PR5+TS6ebU6ebV6+jX7OjY7eradgHTgAAAAAd0Uk5TABMdOODs8wJU1vYAAABTSURBVBhXhczLDoAgDETRKj4AERQB+/9fqmlJWaF3eTIZAIW1aQRKwCwsDVaWFw7nLkSr9TwwlJRuXimGfFJZIO5UFGhV8Jby/UXYqNBf/H98wgO28Q9GlB/5owAAAABJRU5ErkJggg==');
        .toggle {display: none;}
    }
}