Release v1.1.1

Fixed

• Sidebar <nav> styling conflict with top navigation. Changed top nav to <header> element so sidebar nav links no longer inherit 64px height and border-bottom.
• Active nav indicator changed from border-right (clashing with sidebar divider) to border-left with proper spacing.
• Page width inconsistency between landing page (960px) and documentation pages (1200px). Unified to single 1200px wrap class across all pages.
• Landing page now uses shared style.css instead of duplicating styles inline.

Added

• GitHub Pages 404 fallback page with navigation links.
• All guide pages now use absolute /seb/ paths for link consistency.