// flex极为常用，因此不使用命名空间前缀了

.flex {
  display: flex;
  -webkit-flex-wrap: wrap;
  flex-wrap: wrap;

  &.nowrap {
    -webkit-flex-wrap: nowrap;
    flex-wrap: nowrap;
  }

  &.column {
    -webkit-box-direction: normal;
    -webkit-box-orient: vertical;
    -webkit-flex-direction: column;
    flex-direction: column;
  }

  &.row {
    -webkit-box-direction: normal;
    -webkit-box-orient: horizontal;
    -webkit-flex-direction: row;
    flex-direction: row;
  }

  &.center {
    -webkit-align-items: center;
    align-items: center;
    -webkit-box-align: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    justify-content: center;
  }

  &.justify-start {
    -webkit-box-pack: start;
    -webkit-justify-content: flex-start;
    justify-content: flex-start;
  }

  &.justify-end {
    -webkit-box-pack: end;
    -webkit-justify-content: flex-end;
    justify-content: flex-end;
  }

  &.justify-center {
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    justify-content: center;
  }

  &.justify-between {
    -webkit-box-pack: justify;
    -webkit-justify-content: space-between;
    justify-content: space-between;
  }

  &.justify-around {
    -webkit-justify-content: space-around;
    justify-content: space-around;
  }

  &.align-start {
    -webkit-align-content: flex-start;
    align-content: flex-start;
  }

  &.align-end {
    -webkit-align-content: flex-end;
    align-content: flex-end;
  }

  &.align-center {
    -webkit-align-content: center;
    align-content: center;
  }

  &.align-between {
    -webkit-align-content: space-between;
    align-content: space-between;
    -webkit-box-pack: justify;
  }

  &.align-around {
    -webkit-align-content: space-around;
    align-content: space-around;
  }

  &.items-start {
    -webkit-align-items: flex-start;
    align-items: flex-start;
    -webkit-box-align: start;
  }

  &.items-end {
    -webkit-align-items: flex-end;
    align-items: flex-end;
    -webkit-box-align: end;
  }

  &.items-stretch {
    -webkit-align-items: stretch;
    align-items: stretch;
    -webkit-box-align: stretch;
  }

  &.items-stretch > &-item {
    height: auto !important;
  }

  &.items-center {
    -webkit-align-items: center;
    align-items: center;
    -webkit-box-align: center;
  }

  & > &-item {
    -webkit-box-flex: 1;
    -webkit-flex: 1;
    flex: 1;
    position: relative;
    width: 100%;
  }

  & > &-item.align-self-start {
    -webkit-align-self: flex-start;
    align-self: flex-start;
  }

  & > &-item.align-self-end {
    -webkit-align-self: flex-end;
    align-self: flex-end;
  }

  & > &-item.align-self-center {
    -webkit-align-self: center;
    align-self: center;
  }

  & > &-item.align-self-stretch {
    -webkit-align-items: stretch;
    align-items: stretch;
    -webkit-box-align: stretch;
    height: auto !important;
  }

  &flex-1 {
    flex: 1;
  }
}
.flex-1 {
  flex: 1;
}