diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..8c6b43f
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,249 @@
+{
+  "nodes": {
+    "dotfiles": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1778966846,
+        "narHash": "sha256-N7HUWD3dliyPDXA5qXhuma5segnnopgPo2nv5iFaeXc=",
+        "ref": "refs/heads/main",
+        "rev": "c0706258b1ff22c70f6c0e51c4b812e63703f620",
+        "revCount": 6244,
+        "submodules": true,
+        "type": "git",
+        "url": "https://github.com/end-4/dots-hyprland"
+      },
+      "original": {
+        "submodules": true,
+        "type": "git",
+        "url": "https://github.com/end-4/dots-hyprland"
+      }
+    },
+    "firefox-addons": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1784402804,
+        "narHash": "sha256-NKjHErNuyO2x+YBUNOJy/8uKXfuMX60SLFuvZiMYdA8=",
+        "owner": "rycee",
+        "repo": "nur-expressions",
+        "rev": "775bd8e526823ab58efe5d1fc269f2a60c3de2c1",
+        "type": "gitlab"
+      },
+      "original": {
+        "owner": "rycee",
+        "repo": "nur-expressions",
+        "type": "gitlab"
+      }
+    },
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": [
+          "illogical-flake",
+          "nur",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1733312601,
+        "narHash": "sha256-4pDvzqnegAfRkPwO3wmwBhVi/Sye1mzps0zHWYnP88c=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "205b12d8b7cd4802fbcb8e8ef6a0f1408781a4f9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
+    "google-sans-flex": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1763459024,
+        "narHash": "sha256-HMAS0L/Tsqyl1xI16cyIzg9LEb6Dyq91JY4wqFQV9Vs=",
+        "owner": "end-4",
+        "repo": "google-sans-flex",
+        "rev": "251aa5abd30496368f634e54ce2a508fe5a2fdfa",
+        "type": "github"
+      },
+      "original": {
+        "owner": "end-4",
+        "repo": "google-sans-flex",
+        "type": "github"
+      }
+    },
+    "home-manager": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1784407317,
+        "narHash": "sha256-iZrxHToDJWnvt+5LGAtvuQMTy1NZYlNEKbKaVtBJNcc=",
+        "owner": "nix-community",
+        "repo": "home-manager",
+        "rev": "39411a8e12a5526d992e65bc7e3dc9a4414d6713",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "home-manager",
+        "type": "github"
+      }
+    },
+    "hyprland-preview-share-picker": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1782052593,
+        "narHash": "sha256-XE6RD/4Mhw/ZRBj0v94kLOERElat5V+e/X0L9eUGf7M=",
+        "ref": "refs/heads/master",
+        "rev": "e2f30ff85486e557018523da45ccbc846e3a499c",
+        "revCount": 55,
+        "submodules": true,
+        "type": "git",
+        "url": "https://github.com/WhySoBad/hyprland-preview-share-picker"
+      },
+      "original": {
+        "submodules": true,
+        "type": "git",
+        "url": "https://github.com/WhySoBad/hyprland-preview-share-picker"
+      }
+    },
+    "illogical-flake": {
+      "inputs": {
+        "dotfiles": "dotfiles",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "nur": "nur",
+        "quickshell": "quickshell"
+      },
+      "locked": {
+        "lastModified": 1779068758,
+        "narHash": "sha256-7osZ24TmUVDWZDxQ8Bi/P6GYiqTWw5azNWaVd+GfohY=",
+        "owner": "soymou",
+        "repo": "illogical-flake",
+        "rev": "8629ef302b956cf6ab0089338a867dbe844156fd",
+        "type": "github"
+      },
+      "original": {
+        "owner": "soymou",
+        "repo": "illogical-flake",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1784796856,
+        "narHash": "sha256-wWFrV5/Qbm+lyt5x20E/bSbfJiGKMo4RCxZV8cl/WZI=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "e2587caef70cea85dd97d7daab492899902dbf5d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nur": {
+      "inputs": {
+        "flake-parts": "flake-parts",
+        "nixpkgs": [
+          "illogical-flake",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1779066378,
+        "narHash": "sha256-GqKhLVZTmZa68mLlCat57m54aeYPhrNAPVTLd2pGKYk=",
+        "owner": "nix-community",
+        "repo": "NUR",
+        "rev": "ab477ab3a75a85a68a80d9d26a572f9de9742808",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "NUR",
+        "type": "github"
+      }
+    },
+    "quickshell": {
+      "inputs": {
+        "nixpkgs": [
+          "illogical-flake",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1778488696,
+        "narHash": "sha256-QSWgYuZUCNUJ/cxmaq83WkcT7lHQDDfsPVgH+96kIl0=",
+        "ref": "refs/heads/master",
+        "rev": "7d1c9a9c6721606b129829134d6f614f015621e2",
+        "revCount": 818,
+        "type": "git",
+        "url": "https://git.outfoxxed.me/outfoxxed/quickshell"
+      },
+      "original": {
+        "type": "git",
+        "url": "https://git.outfoxxed.me/outfoxxed/quickshell"
+      }
+    },
+    "root": {
+      "inputs": {
+        "firefox-addons": "firefox-addons",
+        "google-sans-flex": "google-sans-flex",
+        "home-manager": "home-manager",
+        "hyprland-preview-share-picker": "hyprland-preview-share-picker",
+        "illogical-flake": "illogical-flake",
+        "nixpkgs": "nixpkgs",
+        "spicetify-nix": "spicetify-nix"
+      }
+    },
+    "spicetify-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1785048222,
+        "narHash": "sha256-LjFVfwxensz76SjnvofF1Jsw+xTLd8Qp31W0J6nh2XI=",
+        "owner": "Gerg-L",
+        "repo": "spicetify-nix",
+        "rev": "17e524f330c282d31c32dfe076222d4a12277886",
+        "type": "github"
+      },
+      "original": {
+        "owner": "Gerg-L",
+        "repo": "spicetify-nix",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
index 32655f5..3297c90 100644
--- a/flake.nix
+++ b/flake.nix
@@ -17,6 +17,37 @@
       # `dotfiles` input (this is the only source-override mechanism):
       # inputs.dotfiles.url = "git+https://github.com/end-4/dots-hyprland?submodules=1&rev=<sha>";
     };
+
+    # GTK4 screenshare picker with live window/monitor previews — replaces the
+    # bare Qt hyprland-share-picker bundled with XDPH. Needs submodules.
+    hyprland-preview-share-picker = {
+      url = "git+https://github.com/WhySoBad/hyprland-preview-share-picker?submodules=1";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    # Declarative Firefox extensions (rycee's firefox-addons, the set behind
+    # nur.repos.rycee.firefox-addons — avoids importing all of NUR). Imported
+    # as a source tree via callPackage rather than its flake output so the
+    # addons evaluate under the system nixpkgs (needed for allowUnfree, e.g.
+    # the 1Password extension).
+    firefox-addons = {
+      url = "gitlab:rycee/nur-expressions";
+      flake = false;
+    };
+
+    # Main UI font of the current end-4 dots. Their installer clones this repo
+    # directly (the font is Google-proprietary, so no distro packages it).
+    google-sans-flex = {
+      url = "github:end-4/google-sans-flex";
+      flake = false;
+    };
+
+    # Declarative Spicetify (Spotify client mods). The home-manager module
+    # installs its own wrapped Spotify — pkgs.spotify must NOT be added anywhere.
+    spicetify-nix = {
+      url = "github:Gerg-L/spicetify-nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
   outputs = { nixpkgs, home-manager, ... }@inputs: {