/**
 * Copyright 2025 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

.btn {
  background-color: $white;
  border-radius: 4px;
  color: $darker-grey;
  font-weight: 700;
  padding: 0.5em 2em;
  text-transform: uppercase;
  display: inline-block;
  text-align: center;

  &:hover {
    color: $darker-grey;
  }
}

input.btn,
submit.btn {
  border: none;
  font-size: inherit;
}

$btn-colors: $white  $gray-02   $green   $blue   $red   $purple   $yellow   $orange   $lightblue   $dark-red $orange-02 $android-green;
$btn-names:  'white' gray-02  'green'  'blue'  'red'  'purple'  'yellow'  'orange'  'lightblue'  'dark-red'  'orange-02' 'android-green';

@each $color in $btn-colors {
  $i: index($btn-colors, $color);

  .btn--fg-#{nth($btn-names, $i)} {
    color: $color;

    &:hover,
    &:active,
    &:focus {
      color: $color;
    }
  }

  .btn--bg-#{nth($btn-names, $i)} {
    background-color: $color;

    &:hover,
    &:active,
    &:focus {
      background-color: darken($color, 10);
    }
  }
}

// Generate a pair of button classes for each section (original and alternate).
// This should be used when adding buttons in each section, in case we change
// the colours in the future.
@each $color in $modifier-colors {
  $i: index($modifier-colors, $color);

  .btn--#{nth($modifier-color-names, $i)} {
    background-color: $color;
    color: nth($modifier-colors-fg, $i);

    &:hover,
    &:focus {
      color: nth($modifier-colors-fg, $i);
      background-color: darken($color, 10);
    }

    a {
      color: nth($modifier-colors-fg, $i);
    }
  }

  .btn--#{nth($modifier-color-names, $i)}--alt {
    background-color: complement($color);
    color: nth($modifier-colors-fg, $i);

    &:hover,
    &:focus {
      color: nth($modifier-colors-fg, $i);
      background-color: darken(complement($color), 10);
    }

    a {
      color: nth($modifier-colors-fg, $i);
    }
  }
}


.btn + .btn {
  margin-left: 1em;
}

.btn--wide {
  width: 100%;
  padding: 0.5em 0;
}

.btn--center {
  display: table;
  margin: 0 auto;
}

.btn--small {
  font-size: 0.9em;
  padding: 0.5em 1.5em;
}

.btn--square {
  border-radius: 0
}

.btn--ios {
  color: $white;
  background-color: $black;
}