## ADDED Requirements ### Requirement: Site themes The site MUST support three themes: - `dark` - `light` - `high-contrast` Themes MUST be applied by setting a `data-theme` attribute on the root document element (``). #### Scenario: Dark theme active - **WHEN** `data-theme="dark"` is set on `` - **THEN** the site's background, text, and component styling reflect the dark palette #### Scenario: Light theme active - **WHEN** `data-theme="light"` is set on `` - **THEN** the site's background, text, and component styling reflect the light palette #### Scenario: High contrast theme active - **WHEN** `data-theme="high-contrast"` is set on `` - **THEN** the site uses a high-contrast palette with a clearly visible focus ring and high-contrast borders ### Requirement: Theme persistence The site MUST persist the user's theme selection so it is retained across page loads and navigations. Persistence MUST be stored locally in the browser (e.g., localStorage). #### Scenario: Theme persists across reload - **WHEN** the user selects `light` theme and reloads the page - **THEN** the `light` theme remains active ### Requirement: Default theme selection If the user has not explicitly selected a theme, the site MUST choose a default theme using environment signals. Default selection order: 1) If forced colors / high-contrast mode is active, default to `high-contrast` 2) Else if the system prefers light color scheme, default to `light` 3) Else default to `dark` #### Scenario: No stored preference uses system settings - **WHEN** the user has no stored theme preference - **THEN** the site selects a default theme based on forced-colors and prefers-color-scheme ### Requirement: Theme switching transition Theme changes initiated by the user MUST transition smoothly. The transition MUST be disabled or substantially reduced when `prefers-reduced-motion: reduce` is set. #### Scenario: Smooth transition on switch - **WHEN** the user switches from `dark` to `light` theme - **THEN** theme-affecting properties transition smoothly instead of abruptly switching #### Scenario: Reduced motion disables theme animation - **WHEN** `prefers-reduced-motion: reduce` is set and the user switches theme - **THEN** the theme change occurs without noticeable animation