/*
 * 变量定义
 * */
/*box sizing*/
/*圆角*/
/*渐变*/
/*
 * 阴影
 * @shadow: inset 0 1px 0 rgba(255,255,255,.1), 0 1px 0 rgba(255,255,255,.1);
  .box-shadow(@shadow);
 */
/*Placeholder text
 *input{
 *     .placeholder(red)
 * }
 * */