.header {
  // scss-docs-start header-css-vars
  --#{$prefix}header-min-height: #{$header-min-height};
  --#{$prefix}header-padding-x: #{$header-padding-x};
  --#{$prefix}header-padding-y: #{$header-padding-y};
  --#{$prefix}header-bg: #{$header-bg};
  --#{$prefix}header-color: #{$header-color};
  --#{$prefix}header-border-color: #{$header-border-color};
  --#{$prefix}header-border: #{$header-border-width} solid var(--#{$prefix}header-border-color);
  --#{$prefix}header-hover-color: #{$header-hover-color};
  --#{$prefix}header-disabled-color: #{$header-disabled-color};
  --#{$prefix}header-active-color: #{$header-active-color};
  --#{$prefix}header-brand-padding-y: #{$header-brand-padding-y};
  --#{$prefix}header-brand-color: #{$header-brand-color};
  --#{$prefix}header-brand-hover-color: #{$header-brand-hover-color};
  --#{$prefix}header-toggler-padding-x: #{$header-toggler-padding-x};
  --#{$prefix}header-toggler-padding-y: #{$header-toggler-padding-y};
  --#{$prefix}header-toggler-bg: #{$header-toggler-bg};
  --#{$prefix}header-toggler-color: #{$header-toggler-color};
  --#{$prefix}header-toggler-border-radius: #{$header-toggler-border-radius};
  --#{$prefix}header-toggler-hover-color: #{$header-toggler-hover-color};
  --#{$prefix}header-toggler-icon-bg: #{escape-svg($header-toggler-icon-bg)};
  --#{$prefix}header-toggler-hover-icon-bg: #{escape-svg($header-toggler-hover-icon-bg)};
  --#{$prefix}header-nav-link-padding-x: #{$header-nav-link-padding-x};
  --#{$prefix}header-nav-link-padding-y: #{$header-nav-link-padding-y};
  --#{$prefix}header-divider-border-color: #{$header-divider-border-color};
  --#{$prefix}header-divider-border: #{$header-divider-border-width} solid var(--#{$prefix}header-divider-border-color);
  --#{$prefix}subheader-min-height: #{$subheader-min-height};
  // scss-docs-end header-css-vars

  position: relative;
  display: flex;
  flex-wrap: wrap; // allow us to do the line break for collapsing content
  align-items: center;
  justify-content: space-between; // space out brand from logo
  min-height: var(--#{$prefix}header-min-height);
  padding: var(--#{$prefix}header-padding-y) var(--#{$prefix}header-padding-x);
  background: var(--#{$prefix}header-bg);
  border-bottom: var(--#{$prefix}header-border);

  // Because flex properties aren't inherited, we need to redeclare these first
  // few properties so that content nested within behave properly.
  // The `flex-wrap` property is inherited to simplify the expanded navbars
  %container-flex-properties {
    display: flex;
    flex-wrap: inherit;
    align-items: center;
    justify-content: space-between;
  }

  > .container,
  > .container-fluid {
    @extend %container-flex-properties;
  }

  @each $breakpoint, $container-max-width in $container-max-widths {
    > .container#{breakpoint-infix($breakpoint, $container-max-widths)} {
      @extend %container-flex-properties;
    }
  }

  .container:first-child,
  .container-fluid:first-child {
    min-height: calc(var(--#{$prefix}header-min-height) - (2 * var(--#{$prefix}header-padding-y))); // stylelint-disable-line function-disallowed-list
  }

  .container:nth-child(n+2),
  .container-fluid:nth-child(n+2) {
    min-height: calc(var(--#{$prefix}subheader-min-height) - (2 * var(--#{$prefix}header-padding-y))); // stylelint-disable-line function-disallowed-list
  }

  &.header-sticky {
    position: sticky;
    top: 0;
    z-index: $zindex-fixed - 1;
  }
}

.header-divider {
  flex-basis: calc(100% + (2 * var(--#{$prefix}header-padding-x))); // stylelint-disable-line function-disallowed-list
  height: 0;
  margin: var(--#{$prefix}header-padding-y) calc(var(--#{$prefix}header-padding-x) * -1); // stylelint-disable-line function-disallowed-list
  border-top: var(--#{$prefix}header-divider-border);
}

// Header brand
//
// Used for brand, project, or site names.

.header-brand {
  padding-top: var(--#{$prefix}header-brand-padding-y);
  padding-bottom: var(--#{$prefix}header-brand-padding-y);
  @include ltr-rtl("margin-right", $header-brand-margin-end);
  @include font-size($header-brand-font-size);
  color: var(--#{$prefix}header-brand-color);
  text-decoration: if($link-decoration == none, null, none);
  white-space: nowrap;

  &:hover,
  &:focus {
    color: var(--#{$prefix}header-brand-hover-color);
    text-decoration: if($link-hover-decoration == underline, none, null);
  }
}

// Header nav
//
// Custom navbar navigation (doesn't require `.nav`, but does make use of `.nav-link`).

.header-nav {
  display: flex;
  flex-direction: row; // cannot use `inherit` to get the `.header`s value
  @include ltr-rtl("padding-left", 0);
  margin-bottom: 0;
  list-style: none;

  .nav-link {
    padding: var(--#{$prefix}header-nav-link-padding-y) var(--#{$prefix}header-nav-link-padding-x);
    color: var(--#{$prefix}header-color);

    &:hover,
    &:focus {
      color: var(--#{$prefix}header-hover-color);
    }

    &.disabled {
      color: var(--#{$prefix}header-disabled-color);
    }
  }

  .show > .nav-link,
  .nav-link.active {
    color: var(--#{$prefix}header-active-color);
  }

  .dropdown-menu {
    position: absolute;
  }
}


// Header text
//
//

.header-text {
  padding-top: var(--#{$prefix}header-nav-link-padding-y);
  padding-bottom: var(--#{$prefix}header-nav-link-padding-y);
  color: var(--#{$prefix}header-color);

  a {
    color: var(--#{$prefix}header-active-color);

    &:hover,
    &:focus {
      color: var(--#{$prefix}header-active-color);
    }
  }
}

.header-toggler {
  padding: var(--#{$prefix}header-toggler-padding-y) var(--#{$prefix}header-toggler-padding-x);
  @include font-size($header-toggler-font-size);
  color: var(--#{$prefix}header-toggler-color);
  background-color: var(--#{$prefix}header-toggler-bg);
  border: 0; // remove default button style
  @include border-radius(var(--#{$prefix}header-toggler-border-radius));

  &:hover {
    color: var(--#{$prefix}header-toggler-hover-color);
    text-decoration: none;
  }

  &:focus {
    outline: 0;
  }

  // Opinionated: add "hand" cursor to non-disabled .navbar-toggler elements
  &:not(:disabled) {
    cursor: pointer;
  }
}

.header-toggler-icon {
  display: block;
  height: $header-toggler-font-size * 1.25;
  background-image: var(--#{$prefix}header-toggler-icon-bg);
  background-repeat: no-repeat;
  background-position: center center;
  background-size: 100% 100%;

  &:hover {
    background-image: var(--#{$prefix}header-toggler-hover-icon-bg);
  }
}