{
  inputs = {
    base16-fish = {
      flake = false;
      url = "github:tomyun/base16-fish";
    };

    base16-foot = {
      flake = false;
      url = "github:tinted-theming/base16-foot";
    };

    base16-helix = {
      flake = false;
      url = "github:tinted-theming/base16-helix";
    };

    base16-tmux = {
      flake = false;
      url = "github:tinted-theming/base16-tmux";
    };

    base16-kitty = {
      flake = false;
      url = "github:kdrag0n/base16-kitty";
    };

    base16-vim = {
      flake = false;
      url = "github:tinted-theming/base16-vim";
    };

    base16.url = "github:SenchoPens/base16.nix";

    flake-compat = {
      flake = false;
      url = "github:edolstra/flake-compat";
    };

    gnome-shell = {
      flake = false;

      # TODO: Unlocking the input and pointing to official repository requires
      # updating the patch:
      # https://github.com/danth/stylix/pull/224#discussion_r1460339607.
      url = "github:GNOME/gnome-shell/46.1";
    };

    # The 'home-manager' input is used to generate the documentation.
    home-manager = {
      inputs.nixpkgs.follows = "nixpkgs";
      url = "github:nix-community/home-manager";
    };

    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
  };

  outputs =
    { nixpkgs, base16, self, ... }@inputs:
    {
      packages = nixpkgs.lib.genAttrs [
        "aarch64-darwin"
        "aarch64-linux"
        "i686-linux"
        "x86_64-darwin"
        "x86_64-linux"
      ] (
        system:
        let
          inherit (nixpkgs) lib;
          pkgs = nixpkgs.legacyPackages.${system};

          universalPackages = {
            docs = import ./docs { inherit pkgs inputs lib; };
            palette-generator = pkgs.callPackage ./palette-generator { };
          };

          # Testbeds are virtual machines based on NixOS, therefore they are
          # only available for Linux systems.
          testbedPackages = lib.optionalAttrs
            (lib.hasSuffix "-linux" system)
            (import ./stylix/testbed.nix { inherit pkgs inputs lib; });
        in
          universalPackages // testbedPackages
      );

      nixosModules.stylix = { pkgs, ... }@args: {
        imports = [
          (import ./stylix/nixos inputs {
            inherit (self.packages.${pkgs.system}) palette-generator;
            base16 = base16.lib args;
            homeManagerModule = self.homeManagerModules.stylix;
          })
        ];
      };

      homeManagerModules.stylix = { pkgs, ... }@args: {
        imports = [
          (import ./stylix/hm inputs {
            inherit (self.packages.${pkgs.system}) palette-generator;
            base16 = base16.lib args;
          })
        ];
      };

      darwinModules.stylix = { pkgs, ... }@args: {
        imports = [
          (import ./stylix/darwin inputs {
            inherit (self.packages.${pkgs.system}) palette-generator;
            base16 = base16.lib args;
            homeManagerModule = self.homeManagerModules.stylix;
          })
        ];
      };
    };
}