## Purpose

Canonical specification for theme-default-system requirements synced from OpenSpec change deltas.

## 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
