.l_main
  position: relative
  header
    display: none
    margin: $gap * 2 $gap $gap
    padding: 0.25rem
    background: var(--block)
    border-radius: 6px
    .logo-wrap
      margin: 0.5rem 0.75rem
      .avatar
        width: 32px
        height: 32px
        border: none
      .title
        font-size: 1.5rem
  nav.menu
    margin: -3px
    a.nav-item
      margin: 2px

// pc上右边顶部留白
@media screen and (min-width: $device-tablet)
  .l_main
    margin-top: $gap

// 移动端显示主导航栏
@media screen and (max-width: $device-tablet)
  .l_main header
    display: block