- Removed the old blur mixin based on filter: blur, and replaced it with backdrop-filter for a more modern frosted glass effect
- Added the `params.header.blur` configuration option, allowing users to enable/disable the header blur effect
- Refactored the masking interaction of the mobile menu and search, applying the blur class to the masking element instead of the body
- Updated the header animation class name to distinguish it from custom animations and avoid conflicts with Animate.css
- Adjusted responsive breakpoints, changing `xs` to `sm` to improve mobile display
- Optimized the header background color and the background color of the fixed buttons
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