Textual TUI Framework Build terminal applications with Textual's web-inspired architecture: App → Screen → Widget. Quick Start Core Concepts Widget Lifecycle 1. → → → / → Reactivity Events and Messages Data Flow - Attributes down : Parent sets child properties directly - Messages up : Child posts messages to parent via Screens Custom Widgets Simple Widget Compound Widget Focusable Widget Layout Patterns Containers Grid CSS Docking Workers (Async) Testing Common Operations References - Widget catalog and messages : See references/widgets.md - CSS properties and selectors : See references/css.m…