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+## ADDED Requirements
+
+### Requirement: GNOME defaults to dark mode
+Every NixOS host built from this flake's shared system module SHALL configure its GNOME desktop session to use dark mode (`color-scheme: prefer-dark`) as the default appearance, while leaving the setting changeable by the user.
+
+#### Scenario: Fresh session uses dark mode
+- **WHEN** a user who has not previously changed the GNOME appearance setting logs into a NixOS host built from this flake's shared system module
+- **THEN** the GNOME desktop session appears in dark mode
+
+#### Scenario: User can still switch to light mode
+- **WHEN** a user opens GNOME Settings' Appearance page on a host built from this flake's shared system module
+- **THEN** the user can select light mode, and that choice takes effect and persists across future logins