Learn how to build clear, maintainable sidebars with a two-column layout, active states and sticky behavior so long-form content and documentation stay navigable without overwhelming the page.
Two columns: navigation and content.
Define a Grid container with one fixed column for navigation and one flexible column for the main content area.
On smaller screens, switch to a single-column layout so the sidebar does not consume too much horizontal space.
Keep navigation visible while preserving reading context.
The sidebar can be pinned with `position: sticky` and a `top` value that respects the space already occupied by the header.
Highlight the active link with enough contrast so users can always tell where they are inside the content structure.