framework/ember/app/styles/flarum/layout.less

body {
  background: @fl-body-bg;
  color: @fl-body-color;
}
.container-narrow {
  max-width: 500px;
  margin: 0 auto;
}
.global-page {
  overflow-x: hidden;
  min-height: 100vh;
}
#assets-loading {
  color: @fl-body-muted-color;
  font-size: 16px;
  padding: 20px;
}

// ------------------------------------
// Page Toolbar

.toolbar() {
  background: fade(@fl-hdr-bg, 98%);
  transform: translateZ(0); // Fix for Chrome bug where a transparent white background is actually gray
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: @zindex-navbar-fixed;
  border-bottom: 1px solid @fl-body-control-bg;
  .transition(~"box-shadow 0.2s, left 0.2s");

  @media @phone {
    height: @mobile-header-height;
  }
  @media @tablet, @desktop, @desktop-hd {
    height: @header-height;
  }
}

// Fix a solid white box to the top of the viewport. This toolbar's contents
// will differ depending on the device: on phones it will be content
// controls, whereas on desktops it will be the header. We will overlay
// these things on top of it later.
.global-page:before {
  content: " ";
  .toolbar();
  border-bottom: 0;

  .scrolled & {
    .box-shadow(0 2px 6px @fl-shadow-color);
  }

  // PHONES: Push the toolbar to the right when the drawer is open.
  @media @phone {
    .drawer-open & {
      left: @drawer-width;
    }
  }
}

// PHONES: Somewhere on the page there will be a .back-button, a .primary-
// control, and a .title-control. We will position these on the left, right,
// and center of the header respectively.
@media @phone {
  .primary-control, .title-control, .back-control {
    position: fixed;
    z-index: @zindex-navbar-fixed + 1;
    top: 5px;
    margin: 0;

    & .btn {
      float: none;
      background: transparent !important;
      .box-shadow(~"none !important");

      &:active {
        opacity: 0.5;
      }
    }
  }
  .primary-control {
    width: auto;
    right: 5px;
    .transition(right 0.2s);

    .drawer-open .global-page & {
      right: -@drawer-width;
    }

    & .dropdown-split {
      & .btn, & .icon-caret {
        display: none;
      }
      & .dropdown-toggle {
        display: block;
      }
    }
  }
  .primary-control, .back-control {
    & .btn {
      color: @fl-hdr-control-color !important;
      padding-left: 5px;
      padding-right: 5px;

      & .icon-glyph {
        display: block;
        font-size: 18px;
      }
      & .label {
        display: none;
      }
    }
  }
  .title-control {
    width: 200px;
    left: 50%;
    margin-left: -100px;
    text-align: center;
    .transition(margin-left 0.2s);

    .drawer-open .global-page & {
      margin-left: -100px + @drawer-width;
    }

    &, & .btn {
      color: @fl-hdr-color;
      font-size: 16px;
    }
  }
  .back-control {
    left: 5px;
    .transition(left 0.2s);

    .drawer-open .global-page & {
      left: @drawer-width + 10px;
    }

    & .pin {
      display: none;
    }
  }
}

// ------------------------------------
// Drawer

// This is a mixin which styles components (buttons, inputs, etc.) for use in
// the drawer. We define it as a mixin because it is also pulled in when
// styling a "colored header".
.drawer-components() {
  .header-title {
    &, & a {
      color: @fl-drawer-color;
    }
  }
  &, & a, & .btn-link {
    color: @fl-drawer-control-color;
  }
  & .form-control {
    background: @fl-drawer-control-bg;
    border: 0;
    color: @fl-drawer-control-color;
    .placeholder(@fl-drawer-control-color);

    &:focus {
      background: fadein(@fl-drawer-control-bg, 5%);
    }
  }
  & .search-input:before {
    color: @fl-drawer-control-color;
  }
  & .btn-default, & .btn-default:hover {
    background: @fl-drawer-control-bg;
    color: @fl-drawer-control-color;
  }
  & .btn-default.active, .open > .dropdown-toggle.btn-default {
    background: fadein(@fl-drawer-control-bg, 5%);
    color: @fl-drawer-control-color;
  }
  & .btn-naked {
    background: transparent;
  }
}

// On phones, the drawer is displayed in its semantic sense: as a drawer on
// the left side of the screen. On other devices, the drawer has no specific
// appearance.
@media @phone {
  .drawer-open {
    overflow: hidden;
  }
  .global-drawer {
    background: @fl-drawer-bg;
    color: @fl-drawer-color;
    width: @drawer-width;
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    visibility: hidden;
    .transition(visibility 0s 0.2s);

    .drawer-components();

    .drawer-open & {
      visibility: visible;
      transition-delay: 0s;
    }
  }
}

// ------------------------------------
// Header

.header-controls {
  margin: 0;
  padding: 0;
  list-style: none;
}

// On phones, the header is displayed inside of the drawer. We lay its
// contents out vertically.
@media @phone {
  .global-header {
    & .container {
      padding: 0;
    }
    & .back-button {
      display: none;
    }
  }
  .header-title {
    border-bottom: 1px solid @fl-drawer-control-bg;
    font-size: 16px;
    font-weight: normal;
    margin: 0;
    line-height: @mobile-header-height;
    white-space: nowrap;
    text-align: center;
  }
  .header-controls {
    & > li {
      padding: 10px 10px 0;
    }
    & .form-control, & .btn-group, & .btn {
      width: 100%;
      text-align: left;
    }
  }
}

// On other devices, we stick the header up the top of the page, overlaying
// the page toolbar that we styled earlier. We lay its contents out
// horizontally.
@media @tablet, @desktop, @desktop-hd {
  .back-button.back-control {
    display: none;
  }
  .global-header {
    padding: 10px;
    height: @header-height;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: @zindex-navbar-fixed;
    .clearfix();

    & when (@fl-colored-hdr = true) {
      .drawer-components();
    }

    & .back-button {
      float: left;
      margin-right: 25px;
    }
  }
  .header-controls {
    &, & > li {
      display: inline-block;
      vertical-align: top;
    }
  }
  .header-primary {
    float: left;
  }
  .header-title {
    display: inline-block;
    vertical-align: top;
    font-size: 18px;
    font-weight: normal;
    margin: 0;
    line-height: 36px;

    &, & a {
      color: @fl-hdr-color;
    }
  }
  .header-secondary {
    float: right;

    & .search-input {
      margin-right: 10px;

      &:focus {
        width: 400px;
      }
    }
  }
}

// ------------------------------------
// Content Area

.global-content {
  border-top: 1px solid @fl-body-control-bg;
}

// On phones, the content area overlays the drawer, so we must give it a
// background and min-height so it cannot be seen through. When the drawer is
// meant to be open, we slide the content to the right to reveal the drawer.
@media @phone {
  .global-content {
    background: @fl-body-bg;
    position: relative;
    width: 100%;
    min-height: 100vh;
    padding-bottom: 15px;
    margin-top: @mobile-header-height;
    .box-shadow(0 0 6px @fl-shadow-color);
    .transition(margin-left 0.2s);

    .drawer-open & {
      margin-left: @drawer-width;
    }
  }
}

@media @tablet, @desktop, @desktop-hd {
  .global-content {
    margin-top: @header-height;
  }
}

// ------------------------------------
// Footer

.footer-primary, .footer-secondary {
  margin: 0;
  padding: 0;
  list-style: none;

  & > li {
    display: inline-block;
    vertical-align: middle;
  }
}

// On phones, the footer is displayed at the bottom of the drawer. The
// footer's primary controls  don't display, but the secondary ones do.
// @todo Maybe we should reverse the naming of primary/secondary then?
@media @phone {
  .global-footer {
    position: fixed;
    left: 15px;
    bottom: 15px;
    width: @drawer-width;
    margin: 0;
    z-index: 1;

    & .container {
      padding: 0;
    }
  }
  .footer-primary {
    display: none;
  }
  .footer-secondary {
    float: none;

    & > li {
      margin-right: 15px;
    }
  }
}

// On other devices, we put the footer at the bottom of the page by absolutely
// positioning it, relative to the page which we pad out at the bottom. We
// show the primary controls on the left, and the secondary controls on the
// right.
@media @tablet, @desktop, @desktop-hd {
  .global-page {
    padding-bottom: 100px;
    position: relative;
  }
  .global-footer {
    position: absolute;
    bottom: 20px;
    left: 0;
    right: 0;

    &, & a {
      color: @fl-body-muted-more-color;
    }
    & a {
      &:hover,
      &:focus {
        text-decoration: none;
        color: @link-hover-color;
      }
    }
  }
  .footer-primary {
    display: inline-block;

    & > li {
      margin-right: 15px;
    }
  }
  .footer-secondary {
    float: right;

    & > li {
      margin-left: 15px;
    }
  }
}

// ------------------------------------
// Miscellaneous

// On phones, we disregard "affixed" elements and make them static.
@media @phone {
  .affix {
    position: static;
  }
}