Bootstrap/scss/_navbar.scss

//
// Navbars
// --------------------------------------------------


// Wrapper and base class
//
// Provide a static navbar from which we expand to create full-width, fixed, and
// other navbar variations.

.navbar {
  position: relative;
  padding: $spacer;
  margin-bottom: $navbar-margin-bottom;
  @include clearfix;

  @include media-breakpoint-up(sm) {
    @include border-radius($navbar-border-radius);
  }
}


//
// Navbar alignment options
//
// Display the navbar across the entirety of the page or fixed it to the top or
// bottom of the page.

// Static top (unfixed, but 100% wide) navbar
.navbar-static-top {
  z-index: $zindex-navbar;

  @include media-breakpoint-up(sm) {
    @include border-radius(0);
  }
}

// Fix the top/bottom navbars when screen real estate supports it
.navbar-fixed-top,
.navbar-fixed-bottom {
  position: fixed;
  right: 0;
  left: 0;
  z-index: $zindex-navbar-fixed;
  margin-bottom: 0; // override .navbar defaults

  // Undo the rounded corners
  @include media-breakpoint-up(sm) {
    @include border-radius(0);
  }
}

.navbar-fixed-top {
  top: 0;
}

.navbar-fixed-bottom {
  bottom: 0;
}


// Brand/project name

.navbar-brand {
  float: left;
  padding: .725rem .75rem;
  margin-right: $spacer;
  margin-bottom: 0; // For headings
  font-size: $font-size-lg;
  line-height: $line-height-computed;

  > a:hover,
  > a:focus {
    text-decoration: none;
  }

  > img {
    display: block;
  }
}


// Navbar toggle
//
// Custom button for toggling the `.navbar-collapse`, powered by the collapse
// JavaScript plugin.

.navbar-toggler {
  float: left;
  padding: .55rem .75rem;
  margin-right: $spacer;
  margin-bottom: 0; // For headings
  font-size: $font-size-lg;
  line-height: $line-height-computed;
  background: none;
  border: 0;

  &:hover,
  &:focus {
    text-decoration: none;
  }
}


// Navbar form
//
// Extension of the `.form-inline` with some extra flavor for optimum display in
// our navbars.

.navbar-form {
  padding: 10px $navbar-padding-horizontal;
  margin-right: -$navbar-padding-horizontal;
  margin-left: -$navbar-padding-horizontal;
  border-top: 1px solid transparent;
  border-bottom: 1px solid transparent;
  @include box-shadow(inset 0 1px 0 rgba(255,255,255,.1), 0 1px 0 rgba(255,255,255,.1));

  // Mixin behavior for optimum display
  @extend .form-inline;

  .form-group {
    @include media-breakpoint-up(sm) {
      margin-bottom: 5px;

      &:last-child {
        margin-bottom: 0;
      }
    }
  }

  // Vertically center in expanded, horizontal navbar
  // @include navbar-vertical-align($input-height-base);

  // Undo 100% width for pull classes
  @include media-breakpoint-up(sm) {
    width: auto;
    padding-top: 0;
    padding-bottom: 0;
    margin-right: 0;
    margin-left: 0;
    border: 0;
    @include box-shadow(none);
  }
}


// Dropdown menus

// Menu position and menu carets
.navbar-nav > li > .dropdown-menu {
  margin-top: 0;
  @include border-top-radius(0);
}
// Menu position and menu caret support for dropups via extra dropup class
.navbar-fixed-bottom .navbar-nav > li > .dropdown-menu {
  @include border-top-radius($navbar-border-radius);
  @include border-bottom-radius(0);
}


// Buttons in navbars
//
// Vertically center a button within a navbar (when *not* in a form).

// .navbar-btn {
//   @include navbar-vertical-align($input-height-base);

//   &.btn-sm {
//     @include navbar-vertical-align($input-height-sm);
//   }
//   &.btn-xs {
//     @include navbar-vertical-align(22);
//   }
// }


// Text in navbars
//
// Add a class to make any element properly align itself vertically within the navbars.

.navbar-text {
  // @include navbar-vertical-align($line-height-computed);

  @include media-breakpoint-up(sm) {
    float: left;
    margin-right: $navbar-padding-horizontal;
    margin-left: $navbar-padding-horizontal;
  }
}


// Component alignment
//
// Repurpose the pull utilities as their own navbar utilities to avoid specificity
// issues with parents and chaining. Only do this when the navbar is uncollapsed
// though so that navbar contents properly stack and align in mobile.
//
// Declared after the navbar components to ensure more specificity on the margins.

@include media-breakpoint-up(sm) {
  .navbar-left {
    @include pull-left();
  }
  .navbar-right {
    @include pull-right();
    margin-right: -$navbar-padding-horizontal;

    ~ .navbar-right {
      margin-right: 0;
    }
  }
}


// Alternate navbars
// --------------------------------------------------

// Default navbar
.navbar-default {
  background-color: $navbar-default-bg;
  border-color: $navbar-default-border;

  .navbar-brand {
    color: $navbar-default-brand-color;

    &:hover,
    &:focus {
      color: $navbar-default-brand-hover-color;
      background-color: $navbar-default-brand-hover-bg;
    }
  }

  .navbar-text {
    color: $navbar-default-color;
  }

  .navbar-nav {
    > li > a {
      color: $navbar-default-link-color;

      &:hover,
      &:focus {
        color: $navbar-default-link-hover-color;
        background-color: $navbar-default-link-hover-bg;
      }
    }
    > .active > a {
      &,
      &:hover,
      &:focus {
        color: $navbar-default-link-active-color;
        background-color: $navbar-default-link-active-bg;
      }
    }
    > .disabled > a {
      &,
      &:hover,
      &:focus {
        color: $navbar-default-link-disabled-color;
        background-color: $navbar-default-link-disabled-bg;
      }
    }
  }

  .navbar-toggle {
    border-color: $navbar-default-toggle-border-color;
    &:hover,
    &:focus {
      background-color: $navbar-default-toggle-hover-bg;
    }
    .icon-bar {
      background-color: $navbar-default-toggle-icon-bar-bg;
    }
  }

  .navbar-collapse,
  .navbar-form {
    border-color: $navbar-default-border;
  }

  // Dropdown menu items
  .navbar-nav {
    // Remove background color from open dropdown
    > .open > a {
      &,
      &:hover,
      &:focus {
        color: $navbar-default-link-active-color;
        background-color: $navbar-default-link-active-bg;
      }
    }
  }


  // Links in navbars
  //
  // Add a class to ensure links outside the navbar nav are colored correctly.

  .navbar-link {
    color: $navbar-default-link-color;
    &:hover {
      color: $navbar-default-link-hover-color;
    }
  }

  .btn-link {
    color: $navbar-default-link-color;
    &:hover,
    &:focus {
      color: $navbar-default-link-hover-color;
    }
    &:disabled,
    fieldset[disabled] & {
      &:hover,
      &:focus {
        color: $navbar-default-link-disabled-color;
      }
    }
  }
}

// Inverse navbar

.navbar-inverse {
  background-color: $navbar-inverse-bg;
  border-color: $navbar-inverse-border;

  .navbar-toggler,
  .navbar-brand > a,
  .nav-pills > .nav-item > .nav-link {
    color: $navbar-inverse-link-color;

    &:hover,
    &:focus {
      color: $navbar-inverse-link-hover-color;
    }
  }
  .nav-pills > .nav-item > .nav-link {
    &:hover,
    &:focus {
      color: $navbar-inverse-link-active-color;
      background-color: $navbar-inverse-link-active-bg;
    }
  }
  .nav-pills > .active > .nav-link,
  .nav-pills > .nav-link.active {
    color: $navbar-inverse-link-active-color;
    background-color: $navbar-inverse-link-active-bg;
  }


  .navbar-brand {
    color: $navbar-inverse-brand-color;
    &:hover,
    &:focus {
      color: $navbar-inverse-brand-hover-color;
      background-color: $navbar-inverse-brand-hover-bg;
    }
  }

  .navbar-text {
    color: $navbar-inverse-color;
  }

  .navbar-nav {
    > li > a {
      color: $navbar-inverse-link-color;

      &:hover,
      &:focus {
        color: $navbar-inverse-link-hover-color;
        background-color: $navbar-inverse-link-hover-bg;
      }
    }
    > .active > a {
      &,
      &:hover,
      &:focus {
        color: $navbar-inverse-link-active-color;
        background-color: $navbar-inverse-link-active-bg;
      }
    }
    > .disabled > a {
      &,
      &:hover,
      &:focus {
        color: $navbar-inverse-link-disabled-color;
        background-color: $navbar-inverse-link-disabled-bg;
      }
    }
  }

  .navbar-collapse,
  .navbar-form {
    border-color: darken($navbar-inverse-bg, 7%);
  }

  // Dropdowns
  .navbar-nav {
    > .open > a {
      &,
      &:hover,
      &:focus {
        color: $navbar-inverse-link-active-color;
        background-color: $navbar-inverse-link-active-bg;
      }
    }
  }

  .navbar-link {
    color: $navbar-inverse-link-color;
    &:hover {
      color: $navbar-inverse-link-hover-color;
    }
  }

  .btn-link {
    color: $navbar-inverse-link-color;

    &:hover,
    &:focus {
      color: $navbar-inverse-link-hover-color;
    }

    &:disabled,
    fieldset[disabled] & {
      &:hover,
      &:focus {
        color: $navbar-inverse-link-disabled-color;
      }
    }
  }
}