/*
  cpt-city: nr/pdr/harris-pdr-13 (cpt)

  Schemes from Moses Harris’ coluor wheels in "The Natural System
  of Colours" (1766), recreated by Nicholas Rougeux 2025

  author: Nicholas Rougeux
  copyright: CC0 1.0
  year: 2025
  url: https://phillips.shef.ac.uk/pub/cpt-city/nr/pdr
*/
linear-gradient(
  0deg,
  rgb(  3,   7, 171)   0.000%,
  rgb(  3,   7, 171)  10.000%,
  rgb(  8,  11, 154)  10.000%,
  rgb(  8,  11, 154)  20.000%,
  rgb(  8,  11, 143)  20.000%,
  rgb(  8,  11, 143)  30.000%,
  rgb( 19,  21, 121)  30.000%,
  rgb( 19,  21, 121)  40.000%,
  rgb( 22,  25, 108)  40.000%,
  rgb( 22,  25, 108)  50.000%,
  rgb( 25,  27,  97)  50.000%,
  rgb( 25,  27,  97)  60.000%,
  rgb( 30,  33,  85)  60.000%,
  rgb( 30,  33,  85)  70.000%,
  rgb( 34,  37,  73)  70.000%,
  rgb( 34,  37,  73)  80.000%,
  rgb( 38,  39,  63)  80.000%,
  rgb( 38,  39,  63)  90.000%,
  rgb( 40,  42,  53)  90.000%,
  rgb( 40,  42,  53) 100.000%
);