Develop a Facebook cover photo (820x312px) featuring a high-resolution, soft-focus image of the Bangladeshi National Flag as the backdrop, creating a serene and respectful atmosphere. Center the text (Bhalobashar Bangladesh) prominently in a striking modern font, using a rich gold color with a soft glow effect to emphasize its importance and ensure legibility and create a sense of movement and energy while maintaining a patriotic theme. The overall design should be visually appealing, ensuring that all elements are balanced and harmonious, and that the cover photo remains legible and impactful on both desktop and mobile views.