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              <div class="fz-s"><p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Accusamus cum mollitia suscipit culpa eaque distinctio in incidunt ad. Odio deserunt, impedit rerum laboriosam consequuntur unde! Perferendis adipisci aliquam quibusdam, minus.</p></div>

<div class="fz-m"><p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Accusamus cum mollitia suscipit culpa eaque distinctio in incidunt ad. Odio deserunt, impedit rerum laboriosam consequuntur unde! Perferendis adipisci aliquam quibusdam, minus.</p></div>

<div class="fz-l"><p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Accusamus cum mollitia suscipit culpa eaque distinctio in incidunt ad. Odio deserunt, impedit rerum laboriosam consequuntur unde! Perferendis adipisci aliquam quibusdam, minus.</p></div>
<div class="test">
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quae, doloribus est consectetur! Earum, numquam temporibus eaque iste repellat nobis harum deserunt explicabo quae deleniti. Beatae doloremque dignissimos, ipsam provident laudantium.</p>
</div>
            
          
!
            
              /*
参考
https://websemantics.uk/tools/responsive-font-calculator/
*/

$bp-min:568;
$bp-max:1024;
//$bp-max:1280px;
@mixin rfcal($min, $max){
   $font_Size_Difference: $max - $min;
    $viewport_Width_Difference: $bp-max - $bp-min;
    $XX: $bp-min/100+px;
    $YY: $font_Size_Difference / $viewport_Width_Difference * 100;
    $ZZ: ($min / 16)*1rem;
    font-size: ($min+($max - $min)*0.5)+px;//calcのフォールバック
    font-size: calc(#{$ZZ} + ((1vw - #{$XX}) * #{$YY}));
}
@mixin rfz($min, $max) {
  @media screen and (max-width: $bp-min+px) {
    font-size: $min+px;
  }
  @media screen and (min-width: $bp-min+px) and (max-width:$bp-max+px) {
   @include rfcal($min, $max);
  }
  @media screen and (min-width:$bp-max+px) {
    font-size: $max+px;
  }
}

.fz-s {
  @include rfz(9, 13);
}

.fz-m {
  @include rfz(12, 16);
}

.fz-l {
  @include rfz(18, 24);
}
p{
  line-height: 1.3;
}

/*
*実際使うなら以下のようなかんじ
*/
.test{
  font-size: 12px;
}
@media screen and (min-width:$bp-min+px) {
.test{
  @include rfcal(12,48);
}
}
            
          
!
999px
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