nixos-config/config/modules/theme.nix

mode:
let
  border-radius = 5;
  colors = {
    background = "#282A2E";
    background-alt = "#373B41";

    foreground = "#C5C8C6";

    primary = "#F0C674";
    secondary = "#8ABEB7";

    alert = "#A54242";
    disabled = "#707880";
  };

  sizing = rec {
    xs = 1;
    s = 2;
    m = 4;
    l = 8;
    xl = 16;
    xxl = 24;
    x3l = 32;
    x4l = 64;

    str = {
      xs = toString xs;
      s = toString s;
      m = toString m;
      l = toString l;
      xl = toString xl;
      xxl = toString xxl;
      x3l = toString x3l;
      x4l = toString x4l;
    };
  };
in
if mode == "light" then {
  inherit border-radius sizing;
  colors = colors // {
    primary = "#9a9aea";
    foreground = "#2e2e1e";
    background = "#bababa";
    background-alt = "#a9a9a9";
  };
} else {
  inherit border-radius sizing;
  colors = colors // { };
}