fix: improve mock button hover contrast

CHANGELOG.md

@@ -11,6 +11,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 - CI check `npm run lint:mocks` (wired into `.github/workflows/verify_build.yml`) fails the build if a prototype HTML file under `docs/public/projects/` doesn't reference the shared banner; allowlist supported for deliberate exceptions (currently `deltag-aarhus`)
 - Migrated all eight prototypes (opkraevningsoverblik, salary-negotiation, climate-nudging × 3, agentic-orchestration, book-aarhus, deltag-aarhus-timeline, wcag-contrast-checker) onto the shared component, removing six per-prototype banner copies
 
+### Fixed
+- Mock button (`Åbn prototypen`) hover state — text now stays white against the brand background instead of inheriting the default link color, which made the label nearly invisible
+
 ### Added — Opkrævningsoverblik BBR-beregner
 - New "Beregner" tab in the Opkrævningsoverblik prototype that calculates four BBR-driven municipal fees: rottebekæmpelse (with the >250 m² rate split), renovation, skorstensfejer, and ejendomsskat (grundskyld)
 - Editable mock-BBR data (grundareal, grundværdi, bygninger med type/m²/ildsteder) per test user with per-field reset and live recalculation

docs/.vitepress/theme/custom.css

@@ -34,7 +34,8 @@
   margin-bottom: 8px;
 }
 
-.mock-button {
+.mock-button,
+.vp-doc a.mock-button {
   display: inline-block;
   padding: 8px 16px;
   border: 1px solid var(--vp-c-brand-1);
@@ -45,9 +46,11 @@
   transition: background-color 0.2s, color 0.2s;
 }
 
-.mock-button:hover {
+.mock-button:hover,
+.vp-doc a.mock-button:hover {
   background-color: var(--vp-c-brand-1);
   color: #fff;
+  text-decoration: none;
 }
 
 .VPFeature .VPImage {