refactor(css): restructure stylesheet, remove duplicates, and improve maintainability
* reorganized CSS into clear sections (Root, Base, Layout, Typography, Components, Utilities) * removed redundant and duplicate rules (header, branding, search, media, etc.) * consolidated repeated selectors into single sources of truth * unified form styles (comments + CF7) * cleaned up sidebar/widget styles and resolved conflicting rules * fixed related posts grid issue (min-width: 0 for grid children) * improved TOC structure and extracted shared calculations * simplified social links and hover behavior * removed unsafe global performance hint (will-change) * added prefers-reduced-motion support for accessibility * improved overall cascade predictability and reduced specificity conflicts No visual changes intended (safe refactor).
This commit is contained in: