systemctl-tui is a terminal user interface for managing systemd services, written in Rust. It provides a fast, interactive alternative to the `systemctl` command-line tool, allowing users to browse, search, filter, and control systemd units (start/stop/restart/enable/mask/kill) and view live journal logs. The application supports both local operation and remote hosts over SSH, using D-Bus over a systemd-stdio-bridge connection on the remote side. Architecturally, the project is a Cargo workspace with three crates: `systemctl-ui-core` (shared library containing systemd D-Bus proxy, SSH helper, journal log parsing, formatting utilities, and a baked-in unit descriptions database), `systemctl-tui` (the main TUI binary built with ratatui, crossterm, and tokio), and `systemctl-gui` (an optional GTK4 frontend, not built by default). The TUI follows a single-component pattern with a large `Home` struct (~3000 lines) that implements a `Component` trait for initialization, event handling, and rendering. The event loop is asynchronous, with debounced journalctl calls and a spinner for service actions. Key features include fuzzy search, status filtering, context-sensitive action menus, a command palette, mouse support (drag to select log text), dark/light theme auto-detection, toast notifications for clipboard copies, and a pager for unit file editing. The project includes snapshot tests for the TUI, unit tests for core logic, and a comprehensive integration test matrix that runs against containers with systemd versions from 239 to current, as well as hostile hosts (no systemd).