#nav
  position: relative
  margin-bottom: 1rem
  background-color: $light-blue
  background-position: center
  background-size: cover


  &.full_page
    background-attachment: local
    height: 100vh
  
  &.bg_local
    background-attachment: local


  #site-social-icons
    margin: 0 auto
    width: 15rem
    text-align: center
    display: none

    .social-icon
      margin: 0 0.5rem
      color: $light-grey
      text-shadow: 0.1rem 0.1rem 0.2rem rgba(0, 0, 0, 0.15)
      font-size: .9rem
      cursor: pointer

      &:hover
        color: $white

#site-info
  position: absolute
  width: 100%
  top: 43%

#site-title,
#site-sub-title
  color: $light-grey
  text-align: center
  text-shadow: 0.1rem 0.1rem 0.2rem rgba(0, 0, 0, 0.15)
  line-height: 1.5

#site-title
  font-weight: bold
  font-size: 1.3rem

#site-sub-title
  font-size: 0.8rem

.scroll-down
  position: absolute
  bottom: 0
  width: 100%
  cursor: pointer
  height: 42px
  font-size: 30px
  text-align: center


#page-header
  position: absolute
  top: 0
  z-index: 99
  padding: 10px 36px
  width: 100%
  border: none
  font-size: 18px
  transition: all 0.2s ease-in-out

  .toggle-menu
    display: none
    padding-top: 0.6rem
    color: $light-grey
    cursor: pointer
    transition: all 0.2s ease-in-out

    &:hover
      color: $white

    .menu-icon-first, 
    .menu-icon-second,
    .menu-icon-third 
      width: 18px
      height: 3px
      background-color: #eee
      margin: 2px 0
      transition: 0.4s
    
    &.close
      /* 旋转第一条横线 */
      .menu-icon-first 
        -webkit-transform: rotate(45deg) translate(4px, 3px)
        transform: rotate(45deg) translate(4px, 3px)

      /* 隐藏第二条横线 */
      .menu-icon-second 
        opacity: 0

      /* 旋转第三条横线 */
      .menu-icon-third 
        -webkit-transform: rotate(-45deg) translate(4px, -4px)
        transform: rotate(-45deg) translate(4px, -4px)






  a
    color: $light-grey
    text-decoration: none

    &:hover
      color: $white

  .site-page
    position: relative
    margin-left: 0.6rem
    padding-bottom: 0.3rem
    text-shadow: 0.05rem 0.05rem 0.1rem rgba(0, 0, 0, 0.3)
    font-size: 0.7rem
    cursor: pointer

    &::after
      position: absolute
      bottom: 0
      left: 0
      z-index: -1
      width: 0
      height: 3px
      background-color: lighten($theme-color, 30%)
      content: ""
      transition: all 0.3s ease-in-out

    &:hover
      &::after
        width: 100%

  &.fixed
    position: fixed
    top: -60px
    z-index: 101
    background: alpha($white, 0.8)
    box-shadow: 0 5px 6px -5px alpha($grey, 0.6)
    transition: transform 0.2s ease-in-out, opacity 0.2s ease-in-out

    &.open-sidebar
      .site-page
        display: none
        opacity: 0

    a,
    #site-name
      color: $light-black
      text-shadow: none
    
    .menu-icon-first, 
    .menu-icon-second,
    .menu-icon-third
      background-color: $light-black
      text-shadow: none


      &a,#site-name
        &:hover
          color: $light-blue

  &.visible
    transform: translate3d(0, 100%, 0)

  #site-name
    text-shadow: 0.1rem 0.1rem 0.2rem rgba(0, 0, 0, 0.15)
    font-weight: bold
    cursor: pointer

@media screen and (min-width: $sm)
  #site-title
    font-size: 2rem

  #site-sub-title
    font-size: 1.2rem

@media screen and (max-width: $sm)

  #page-header
    padding: 10px 0.8rem

    .toggle-menu
      display: block

    .menus
      position: absolute
      top: 3rem
      right: 0.8rem
      display: none
      width: 8rem
      background: alpha($white, 0.9)
      cursor: pointer
      box-shadow: 0 0 4px rgba(0, 0, 0, 0.27)

      a
        display: block !important
        opacity: 1 !important
        margin-left: 0
        padding-top: 0.3rem
        padding-bottom: 0.3rem
        padding-left: 0.6rem
        color: $font-black
        text-shadow: none
        font-size: 0.8rem
        z-index: 0

        &:hover
          color: $light-blue

    .search 
      right: 0.5rem

      span
        display none
    
    &.fixed.open-sidebar 
      .search
        display: inline-block;
        opacity: 1;


#page-header .site-page
  margin-left: 1rem