$button ?= $grey-darker
$button-background ?= $white
$button-border ?= $grey-lighter

$button-hover ?= $link-hover
$button-hover-border ?= $link-hover-border

$button-focus ?= $link-focus
$button-focus-border ?= $link-focus-border
$button-focus-box-shadow-size ?= 0 0 0 0.125em
$button-focus-box-shadow-color ?= rgba($link, 0.25)

$button-active ?= $link-active
$button-active-border ?= $link-active-border

$button-text-color ?= $text
$button-text-hover-background-color ?= $background
$button-text-hover-color ?= $text-strong

$button-disabled-background-color ?= $white
$button-disabled-border-color ?= $grey-lighter
$button-disabled-shadow ?= none
$button-disabled-opacity ?= 0.5

$button-static ?= $grey
$button-static-background ?= $white-ter
$button-static-border ?= $grey-lighter

// The button sizes use mixins so they can be used at different breakpoints
button-small()
  border-radius $radius-small
  font-size $size-small
button-medium()
  font-size $size-medium
button-large()
  font-size $size-large

.button
  control()
  unselectable()
  background-color $button-background
  border-color $button-border
  color $button
  cursor pointer
  justify-content center
  padding-left 0.75em
  padding-right 0.75em
  text-align center
  white-space nowrap
  strong
    color inherit
  .icon
    &,
    &.is-small,
    &.is-medium,
    &.is-large
      height 1.5em
      width 1.5em
    &:first-child:not(:last-child)
      margin-left calc(-0.375em - 1px)
      margin-right 0.1875em
    &:last-child:not(:first-child)
      margin-left 0.1875em
      margin-right calc(-0.375em - 1px)
    &:first-child:last-child
      margin-left calc(-0.375em - 1px)
      margin-right calc(-0.375em - 1px)
  // States
  &:hover,
  &.is-hovered
    border-color $button-hover-border
    color $button-hover
  &:focus,
  &.is-focused
    border-color $button-focus-border
    color $button-focus
    &:not(:active)
      box-shadow $button-focus-box-shadow-size $button-focus-box-shadow-color
  &:active,
  &.is-active
    border-color $button-active-border
    color $button-active
  // Colors
  &.is-text
    background-color transparent
    border-color transparent
    color $text
    text-decoration underline
    &:hover,
    &.is-hovered,
    &:focus,
    &.is-focused,
      background-color $button-text-hover-background-color
      color $button-text-hover-color
    &:active,
    &.is-active
      background-color darken($button-text-hover-color, 5%)
      color $button-text-hover-color
    &[disabled]
      background-color transparent
      border-color transparent
      box-shadow none
  for $name, $pair in $colors
    $color = $pair['1']
    $color-invert = $pair['2']
    &.is-{$name}
      background-color $color
      border-color transparent
      color $color-invert
      &:hover,
      &.is-hovered
        background-color darken($color, 2.5%)
        border-color transparent
        color $color-invert
      &:focus,
      &.is-focused
        border-color transparent
        color $color-invert
        &:not(:active)
          box-shadow $button-focus-box-shadow-size $button-focus-box-shadow-color
      &:active,
      &.is-active
        background-color darken($color, 5%)
        border-color transparent
        color $color-invert
      &[disabled]
        background-color $color
        border-color transparent
        box-shadow none
      &.is-inverted
        background-color $color-invert
        color $color
        &:hover
          background-color darken($color-invert, 5%)
      &.is-loading
        &:after
          border-color transparent transparent $color-invert $color-invert !important
      &.is-outlined
        background-color transparent
        border-color $color
        color $color
        &:hover,
        &:focus
          background-color $color
          border-color $color
          color $color-invert
        &.is-loading
          &:after
            border-color transparent transparent $color $color !important
          &[disabled]
            background-color transparent
            border-color $color
            box-shadow none
            color $color
      &.is-inverted.is-outlined
        background-color transparent
        border-color $color-invert
        color $color-invert
        &:hover,
        &:focus
          background-color $color-invert
          color $color
        &[disabled]
          background-color transparent
          border-color $color-invert
          box-shadow none
          color $color-invert
  // Sizes
  &.is-small
    button-small()
  &.is-medium
    button-medium()
  &.is-large
    button-large()
  // Modifiers
  &[disabled]
    background-color $button-disabled-background-color
    border-color $button-disabled-border-color
    box-shadow $button-disabled-shadow
    opacity $button-disabled-opacity
  &.is-fullwidth
    display flex
    width 100%
  &.is-loading
    color transparent !important
    pointer-events none
    &:after
      loader()
      center(1em)
      position absolute !important
  &.is-static
    background-color $button-static-background
    border-color $button-static-border
    color $button-static
    box-shadow none
    pointer-events none

.buttons
  align-items center
  display flex
  flex-wrap wrap
  justify-content flex-start
  .button
    margin-bottom 0.5rem
    &:not(:last-child)
      margin-right 0.5rem
  &:last-child
    margin-bottom -0.5rem
  &:not(:last-child)
    margin-bottom 1rem
  &.has-addons
    .button
      &:not(:first-child)
        border-bottom-left-radius 0
        border-top-left-radius 0
      &:not(:last-child)
        border-bottom-right-radius 0
        border-top-right-radius 0
        margin-right -1px
      &:last-child
        margin-right 0
      &:hover,
      &.is-hovered
        z-index 2
      &:focus,
      &.is-focused,
      &:active,
      &.is-active,
      &.is-selected
        z-index 3
        &:hover
          z-index 4
  &.is-centered
    justify-content center
  &.is-right
    justify-content flex-end