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openspec/changes/archive/2026-02-13-p06-theming/specs/theme-default-system/spec.md

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+## ADDED Requirements
+
+### Requirement: System theme is default when no preference exists
+The system SHALL default to system theme behavior if no persisted theme preference is found.
+
+#### Scenario: No saved preference on first visit
+- **WHEN** a user visits the site with no stored theme value
+- **THEN** the UI resolves theme from system color-scheme preference
+- **AND** switcher indicates system mode as active
+
+#### Scenario: Persisted preference overrides system default
+- **WHEN** a user has an existing stored theme preference
+- **THEN** stored preference is applied instead of system mode
+- **AND** user-selected theme remains stable across reloads