// z_index variables
$z_1: 100;
$z_2: 200;
$z_3: 300;
$z_4: 400;
$z_5: 500;
$z_6: 600;
$z_7: 700;
$z_8: 800;
$z_9: 900;
$z_10: 1000;
$z_index: (
  zindex_1: $z_1,
  zindex_2: $z_1,
  zindex_3: $z_1,
  zindex_4: $z_1,
  zindex_5: $z_1,
  zindex_6: $z_1,
  zindex_7: $z_1,
  zindex_8: $z_1,
  zindex_9: $z_1,
);

$z_layers: (
  "header": $z_10,
  "default": 0
);

$offscreen: -9999px;

@function z_index_for($layer) {
  @if not map-has-key($z_layers, $layer) {
    @error "No layer found for `#{$layer}` in $z_layers map.";
  }
  @return map-get($z_layers, $layer);
}

:export {
  @mixin export_z_index($z_index_list) {
    @each $name, $settings in $z_index_list {
      #{$name}: $settings;
    }
  }
  @include export_z_index($z_index);
}