water.scss

#bathymetry[DEPTH<3000] { 
  text-face-name: 'hillshade Regular';
  text-avoid-edges: true;
  text-min-distance: 5;
  text-placement:interior;
  text-fill: mix(@lightblue,@blue,80);
  text-allow-overlap: false;
  text-name: "'a'";
  [DEPTH>=0][DEPTH<500] {
    text-size:30;
    [zoom>=5]  { text-size: 35;}
    [zoom>=6] { text-size: 40;}
    [zoom>=8] { text-size: 45;}
    text-fill: mix(@lightblue,@purple,80);
  }
  [DEPTH>=500][DEPTH<1250] { 
    text-name: "'c'";
    text-min-distance: 20;
    text-size:25;
    [zoom>=5]  { text-size: 30;}
    [zoom>=7] { text-size: 35;}
    [zoom>=8] { text-size: 40;}
    text-fill: mix(@lightblue,@blue,70);
  }
  [DEPTH>=1250][DEPTH<3000] { 
    text-name: "'b'";
    text-min-distance: 30;
    text-size:25;
    [zoom>=5]  { text-size: 30;}
    [zoom>=7] { text-size: 35;}
    [zoom>=8] { text-size: 40;}
    text-fill: mix(@lightblue,@purple,70);
  }
}