{
  lib,
  config,
  namespace,
  pkgs,
  ...
}:
let
  inherit (lib) mkIf;
  inherit (lib.${namespace}) mkEnableModule enabled;

  cfg = config.${namespace}.appearance.base;
  inherit (config.${namespace}) theme;
in
{
  options.appearance = mkEnableModule "base";

  config = mkIf cfg.enable {
    home.packages = with pkgs; [
      maple-mono-NF
    ];

    ${theme.colors.base}.pointerCursor = enabled;

    ${namespace}.theme = {
      default = "dark";

      dark = {
        base = "rose-pine";
        flavor = "main";
      };

      light = {
        base = "rose-pine";
        flavor = "dawn";
      };
    };

    ${namespace}.theme.icons = {
      package = pkgs.kora-icon-theme;
      name = "kora";
    };

    # TODO: package font with harfbuzz features.
    fonts.fontconfig.defaultFonts.monospace = [ "Maple Mono NF" ];
  };
}