/*：源代码唯一下载链接: http://www.bootstrapmb.com/item/100(当前备注仅在演示里出现，下载源码不包含)*//* Nestable */.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;     margin: 5px 0;     padding: 8px 15px 8px 15px;     color: #333;     text-decoration: none;     font-weight: bold;     border: 1px solid #e7e7e7;    background: #fafafa;    -webkit-border-radius: 3px;    border-radius: 3px;    box-sizing: border-box;     -moz-box-sizing: border-box;}.dd-item >button {    display: block;    position: relative;    cursor: pointer;     float: left;    width: 25px;     height: 38px;    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;     outline: 0;}.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: #f2fbff;     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-image: -webkit-linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff),                      -webkit-linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff);    background-image:    -moz-linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff),                         -moz-linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff);    background-image:         linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff),                              linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff);    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);}/* Nestable Draggable Handles */.dd3-content {     display: block;    margin: 5px 0;     padding: 8px 10px 8px 50px;    color: #333;    text-decoration: none;     font-weight: bold;    border: 1px solid #e7e7e7;    background: #fafafa;    -webkit-border-radius: 3px;    border-radius: 3px;    box-sizing: border-box;     -moz-box-sizing: border-box;}.dd-dragel >.dd3-item >.dd3-content {     margin: 0; }.dd3-item >button {     margin-left: 30px; }.dd3-item >button:before {     display: none; }.dd3-handle {     position: absolute;     margin: 0;     left: 0;     top: 0;     cursor: pointer;    width: 35px;     text-indent: 100%;    white-space: nowrap;     overflow: hidden;    border: 1px solid #e7e7e7;    background: #fafafa;    border-top-right-radius: 0;    border-bottom-right-radius: 0;    height: 38px;}.dd3-handle:before {     content: '≡';    display: block;    position: absolute;    left: 0;     width: 100%;    text-align: center;    text-indent: 0;    color: #333;     font-size: 20px;    font-weight: normal;     }.dd3-handle:hover {     background: #f1f1f1; }/*：源代码唯一下载链接: http://www.bootstrapmb.com/item/100(当前备注仅在演示里出现，下载源码不包含)*/