A series of accessibility improvements based on an external audit: keyboard operation of login, start page, contact import and the newsletter editor, ARIA roles for selection, tab and tree components, visible labels instead of placeholder texts, text contrast raised to 4.5:1 and control contrast to 3:1, a consistent visible focus ring, alternative texts for charts and icons, page titles per route, dismissible tooltips, corrected focus handling in pop-ups, a one-column layout at strong zoom, and support for high-contrast mode. Use case: A user who relies on a screen reader can log in, import contacts and edit a newsletter without a mouse.