{
  pkgs,
  config,
  ...
}:
let
  # Stylix expose sa palette base16 ici (pas `config.colorScheme`, qui vient de
  # nix-colors et n'existe pas dans cette config).
  c = config.lib.stylix.colors.withHashtag;

  wallpaper = "${config.home.homeDirectory}/nixos-config/dotfiles/hypr/wallpaper/nix-wallpaper.png";
in
{
  wayland.windowManager.niri = {
    enable = true;
    package = pkgs.niri;

    # xwayland-satellite dans le PATH suffit : niri démarre XWayland à la demande
    xwaylandSatellitePackage = pkgs.xwayland-satellite;

    # niri recommande le portail gnome (screencast, file chooser)
    portalPackage = pkgs.xdg-desktop-portal-gnome;

    # valide le KDL généré au moment du build : les erreurs de config
    # apparaissent pendant `nixos-rebuild`, pas au premier login
    checkConfig = true;

    settings = {
      prefer-no-csd = { };
      screenshot-path = "~/Screenshots/%Y-%m-%d %H-%M-%S.png";
      hotkey-overlay.skip-at-startup = { };

      # --- entrées -------------------------------------------------------
      input = {
        keyboard.xkb.layout = "fr";
        keyboard.numlock = { };
        touchpad = {
          tap = { };
          dwt = { };
          accel-profile = "adaptive";
          scroll-factor = 1.2;
        };
        mouse = {
          accel-profile = "adaptive";
          accel-speed = -0.3;
        };
        focus-follows-mouse = { };
      };

      # --- disposition ---------------------------------------------------
      layout = {
        gaps = 8;
        center-focused-column = "never";

        default-column-width.proportion = 0.5;
        preset-column-widths._children = [
          { proportion = 0.33333; }
          { proportion = 0.5; }
          { proportion = 0.66667; }
        ];

        focus-ring = {
          width = 2;
          active-color = c.base0D;
          inactive-color = c.base03;
        };
        border.off = { };
      };

      # --- raccourcis ----------------------------------------------------
      # calqués sur conf/binding.lua pour garder les réflexes.
      # NB : dans niri `Mod` = Super. J/K reprennent ton inversion Hyprland
      # (J = haut, K = bas).
      binds = {
        "Mod+Shift+Slash".show-hotkey-overlay = { };

        # session
        "Ctrl+Alt+M".quit = { };
        "Ctrl+Alt+L".spawn = [ "hyprlock" ];

        # lanceurs
        "Alt+Q".spawn = [ "kitty" ];
        "Alt+N".spawn = [
          "kitty"
          "-e"
          "nvim"
        ];
        "Alt+D".spawn = [ "dolphin" ];
        "Alt+F".spawn = [ "zen-beta" ];
        "Alt+Z".spawn = [ "zotero" ];
        "Alt+T".spawn = [ "thunderbird" ];
        "Alt+W".spawn = [
          "rofi"
          "-show"
          "drun"
        ];
        "Alt+X".spawn = [
          "rofi"
          "-show"
          "window"
        ];
        "Alt+C".spawn = [
          "rofi"
          "-show"
          "filebrowser"
        ];
        "Super+V".spawn = [
          "sh"
          "-c"
          "cliphist list | rofi -dmenu -display-columns 2 | cliphist decode | wl-copy"
        ];

        # fenêtres
        "Alt+F4".close-window = { };
        "Alt+V".toggle-window-floating = { };
        "Alt+M".maximize-column = { };
        "Alt+Shift+F".fullscreen-window = { };

        # focus (colonnes = gauche/droite, fenêtres dans la colonne = haut/bas)
        "Alt+H".focus-column-left = { };
        "Alt+L".focus-column-right = { };
        "Alt+J".focus-window-up = { };
        "Alt+K".focus-window-down = { };

        # déplacement de fenêtre
        "Ctrl+Super+H".move-column-left = { };
        "Ctrl+Super+L".move-column-right = { };
        "Ctrl+Super+J".move-window-up = { };
        "Ctrl+Super+K".move-window-down = { };

        # espaces de travail (verticaux dans niri)
        "Super+L".focus-workspace-down = { };
        "Super+H".focus-workspace-up = { };
        "Super+K".move-column-to-workspace-down = { };
        "Super+J".move-column-to-workspace-up = { };

        # écrans
        "Alt+A".focus-monitor-left = { };
        "Alt+B".focus-monitor-right = { };
        "Ctrl+Super+A".move-column-to-monitor-left = { };
        "Ctrl+Super+B".move-column-to-monitor-right = { };

        # largeur de colonne
        "Alt+R".switch-preset-column-width = { };
        "Alt+Minus".set-column-width = [ "-10%" ];
        "Alt+Equal".set-column-width = [ "+10%" ];

        # captures d'écran (intégrées à niri, pas besoin de grim/slurp)
        "Print".screenshot = { };
        "Ctrl+Print".screenshot-screen = { };
        "Alt+Print".screenshot-window = { };

        # multimédia / luminosité
        "XF86MonBrightnessUp" = {
          _props.allow-when-locked = true;
          spawn = [
            "brightnessctl"
            "-e4"
            "-n2"
            "set"
            "5%+"
          ];
        };
        "XF86MonBrightnessDown" = {
          _props.allow-when-locked = true;
          spawn = [
            "brightnessctl"
            "-e4"
            "-n2"
            "set"
            "5%-"
          ];
        };
        "XF86AudioRaiseVolume" = {
          _props.allow-when-locked = true;
          spawn = [
            "wpctl"
            "set-volume"
            "-l"
            "1"
            "@DEFAULT_AUDIO_SINK@"
            "5%+"
          ];
        };
        "XF86AudioLowerVolume" = {
          _props.allow-when-locked = true;
          spawn = [
            "wpctl"
            "set-volume"
            "@DEFAULT_AUDIO_SINK@"
            "5%-"
          ];
        };
        "XF86AudioMute" = {
          _props.allow-when-locked = true;
          spawn = [
            "wpctl"
            "set-mute"
            "@DEFAULT_AUDIO_SINK@"
            "toggle"
          ];
        };
        "XF86AudioMicMute" = {
          _props.allow-when-locked = true;
          spawn = [
            "wpctl"
            "set-mute"
            "@DEFAULT_AUDIO_SOURCE@"
            "toggle"
          ];
        };
      };

      # --- nœuds répétés / paramétrés ------------------------------------
      _children = [
        # écrans : niri prend le mode « preferred » si on ne précise rien
        {
          output = {
            _args = [ "eDP-1" ];
            scale = 1.0;
            position._props = {
              x = 0;
              y = 0;
            };
          };
        }
        { output._args = [ "HDMI-A-1" ]; }

        # démarrage
        {
          spawn-at-startup._args = [
            "swaybg"
            "-i"
            wallpaper
            "-m"
            "fill"
          ];
        }
        { spawn-at-startup._args = [ "mako" ]; }
        {
          spawn-at-startup._args = [
            "sh"
            "-c"
            "wl-paste --type text --watch cliphist store"
          ];
        }
        {
          spawn-at-startup._args = [
            "sh"
            "-c"
            "wl-paste --type image --watch cliphist store"
          ];
        }

        # règles de fenêtres : exemple, à étoffer au fur et à mesure
        {
          window-rule._children = [
            { match._props.app-id = "^org\\.keepassxc\\.KeePassXC$"; }
            { block-out-from = "screen-capture"; }
          ];
        }
      ];
    };
  };

  home.packages = with pkgs; [
    swaybg # niri n'a pas de gestionnaire de fond d'écran intégré
    xwayland-satellite
  ];
}