.dd {
    position: relative;
    display: block;
    margin: 0;
    padding: 0;
    max-width: 600px;
    list-style: none;
    font-size: 13px;
    line-height: 20px;
}

.dd-list {
    display: block;
    position: relative;
    margin: 0;
    padding: 0;
    list-style: none;
}

.dd-list .dd-list {
    padding-left: 30px;
}

.dd-collapsed .dd-list {
    display: none;
}

.dd-item, .dd-empty, .dd-placeholder {
    display: block;
    position: relative;
    margin: 0;
    padding: 0;
    min-height: 20px;
    font-size: 13px;
    line-height: 20px;
}

.dd-handle {
    display: block;
    height: auto;
    margin: 5px 0;
    padding: 8px 16px;
    cursor: move;
    color: #979898;
    text-decoration: none;
    font-weight: bold;
    border: 1px solid #e5e5e5;
    background: #fafafa;
    box-sizing: border-box;
    -moz-box-sizing: border-box;
}

.dd-handle:hover {
    color: #317eeb;
    background: #fff;
}

.dd-item>button {
    display: block;
    position: relative;
    cursor: pointer;
    float: left;
    width: 25px;
    height: 20px;
    margin: 5px 0;
    padding: 0;
    text-indent: 100%;
    white-space: nowrap;
    overflow: hidden;
    border: 0;
    background: transparent;
    font-size: 12px;
    line-height: 1;
    text-align: center;
    font-weight: bold;
}

.dd-item>button:before {
    content: '+';
    display: block;
    position: absolute;
    width: 100%;
    text-align: center;
    text-indent: 0;
}

.dd-item>button[data-action="collapse"]:before {
    content: '-';
}

.dd-placeholder, .dd-empty {
    margin: 5px 0;
    padding: 0;
    min-height: 30px;
    background: #f5f5f5;
    border: 1px dashed #b6bcbf;
    box-sizing: border-box;
    -moz-box-sizing: border-box;
}

.dd-empty {
    border: 1px dashed #bbb;
    min-height: 100px;
    background-color: #e5e5e5;
    background-size: 60px 60px;
    background-position: 0 0, 30px 30px;
}

.dd-dragel {
    position: absolute;
    pointer-events: none;
    z-index: 9999;
}

.dd-dragel>.dd-item .dd-handle {
    margin-top: 0;
}

.dd-dragel .dd-handle {
    -webkit-box-shadow: 2px 4px 6px 0 rgba(0, 0, 0, .1);
    box-shadow: 2px 4px 6px 0 rgba(0, 0, 0, .1);
}

.dd3-content {
    display: block;
    height: auto;
    margin: 5px 0;
    padding: 8px 16px 8px 40px;
    color: #979898;
    text-decoration: none;
    font-weight: bold;
    border: 1px solid #e5e5e5;
    background: #fafafa;
    box-sizing: border-box;
    -moz-box-sizing: border-box;
}

.dd3-content:hover {
    color: #317eeb;
    background: #fff;
}

.dd-dragel>.dd3-item>.dd3-content {
    margin: 0;
}

.dd3-item>button {
    margin-left: 30px;
}

.dd3-handle {
    position: absolute;
    margin: 0;
    left: 0;
    top: 0;
    cursor: pointer;
    width: 30px;
    text-indent: 100%;
    white-space: nowrap;
    overflow: hidden;
    border: 1px solid #ccc;
    background: #d5d5d5;
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
}

.dd3-handle:before {
    content: "\f0c9";
    font-family: FontAwesome;
    display: block;
    position: absolute;
    left: 0;
    top: 8px;
    width: 100%;
    text-align: center;
    text-indent: 0;
    color: #fff;
    font-size: 14px;
    font-weight: normal;
}

.dd3-handle:hover {
    background: #404040;
    border: 1px solid #404040;
}