@use "sass:math";
@use "../settings" as *;
@use "../tools/exports" as *;
@use "../tools/font-url" as *;
@forward "../tools/font-url" show nhsuk-font-url;

////
/// Font face
///
/// NHS uses the Frutiger font. To use the font you must have a licence.
/// NHS England has a licence for the Frutiger webfont which all NHS organisations in England can use.
/// NHS organisations can register here: https://service-manual.nhs.uk/design-system/styles/use-frutiger-font/
///
/// @group generic
////

@mixin nhsuk-font-face-frutiger {
  @at-root {
    @font-face {
      font-family: "Frutiger W01";
      font-style: normal;
      font-weight: $nhsuk-font-weight-normal;
      font-display: fallback;
      src:
        nhsuk-font-url("FrutigerLTW01-55Roman.woff2") format("woff2"),
        nhsuk-font-url("FrutigerLTW01-55Roman.woff") format("woff");
    }

    @font-face {
      font-family: "Frutiger W01";
      font-style: normal;
      font-weight: $nhsuk-font-weight-bold;
      font-display: fallback;
      src:
        nhsuk-font-url("FrutigerLTW01-65Bold.woff2") format("woff2"),
        nhsuk-font-url("FrutigerLTW01-65Bold.woff") format("woff");
    }
  }
}

/// Font 'Dynamic Type' support
///
/// On Apple devices, uses the -apple-system-body font to enable system-level
/// Dynamic Type for accessibility but prevents the system body font-family.

@mixin nhsuk-font-dynamic-type {
  @at-root {
    html {
      font-size: math.percentage(math.div($nhsuk-root-font-size, 16px));

      @supports (font: -apple-system-body) and (-webkit-touch-callout: default) {
        // stylelint-disable-next-line font-family-no-missing-generic-family-keyword
        font: -apple-system-body;
      }
    }
  }
}