Entiendo perfectamente tu frustración, y te pido disculpas. Dejemos de lado las optimizaciones y los métodos complejos.
Vamos a usar la solución más simple y directa posible, que no depende de nada más que del scroll de la página.
Este método hace dos cosas:
1. **JavaScript:** Vigila si la página está desplazada hacia abajo. Si lo está, añade una clase global a la página.
2. **CSS:** Usa esa clase global para cambiar el estilo de tu barra.
Este enfoque es a prueba de fallos porque es la comprobación más básica que existe y no interfiere con otros scripts.
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### Solución Directa y Final
Por favor, **borra cualquier script anterior** que te haya dado y pega este único bloque de código en la configuración de tu página, en la sección de **Custom Code** \> **Before `
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