org-modern is an Emacs Lisp package that provides a modern visual style for Org mode buffers. It uses font-lock keywords and text properties to prettify headlines, tables, source blocks, timestamps, tags, TODO keywords, priorities, checkboxes, lists, progress bars, footnotes, internal/radio targets, horizontal rules, block names, and block fringes. The package is implemented as a single-file minor mode (`org-modern-mode`) with a global variant (`global-org-modern-mode`) and an agenda styling function (`org-modern-agenda`). It relies on Emacs 29.1, Org 9.6, and the Compat library. The code is well-structured, extensively customizable via defcustom options, and follows modern Emacs Lisp conventions. It does not contain reusable components outside the Org mode context, but the implementation demonstrates high craftsmanship in leveraging Emacs' font-lock and text property systems for UI styling.