fix: add hover feedback to language selector label
- added hover styling to .lang__label for better user feedback
- applied consistent opacity change on caret and text
refs: #147
feat(slidepanel): animation and styling improvement
- slight dropshadow to sidepanel
- added opacity transition to sidepanel for smoother opening effect
- added pointer-events locking when panel is closed
refs: #147
feat: responsive slidepanel navigation
- added CSS-only hamburger toggle, for progressive enhancement (support without javascript on)
- added hamburger-to-X animation
- built slidepanel including search field, navigation items, and footer
- set mobile width to 100vw for full-screen overlay
- from 650px upward, applied responsive width min(400px, 85vw) for tablet/desktop
- integrated with existing header, language selector, and desktop navigation
feat(navbar): add CSS-only language dropdown
Implemented a fully CSS-driven language selector:
- added checkbox-based toggle mechanism for EN/NL dropdown
- added caret SVG that rotates 180° when the dropdown is open
- added dropdown menu markup with EN/NL language links
- styled dropdown menu positioning, spacing and hover states
Refs: #147
refactor(navbar): restructure header layout and update styling for solid non-transparent navbar
Reworked the HTML structure of the navigation header:
- replaced old multi-section layout with a single-row structure
(header__logo, header__center, header__right)
- removed obsolete nav__content, nav__top and mobile list blocks
- normalized SVG icons for alignment
Updated the CSS:
- removed transparent gradient and blur; navbar now uses solid background
- reduced overall header height using padding instead of fixed height
- implemented new flex layout for proper spacing and centering
- updated logo sizing and link alignment
- removed unused selectors and outdated styles
Refs: #147
