DelvUI is a Dalamud plugin for Final Fantasy XIV that provides a fully customizable replacement for the default HUD. It renders real-time overlays using ImGui, reading game state via FFXIVClientStructs and Lumina Excel sheets. The architecture is highly config-driven: every visual element (unit frames, party frames, nameplates, job gauges, castbars, status effects) is defined by nested config classes with custom attributes that auto-generate settings UI. A central ConfigurationManager manages profiles, import/export, version migration, and backward-compatible JSON converters. The plugin supports mouseover targeting, input proxying, custom fonts and bar textures, and integrates with other plugins via IPC. It includes 22 job-specific HUD modules that convert game gauge data into configurable bar layouts. The codebase is well-structured with reusable primitives (BarUtilities, DrawHelper, ColorUtils) and a singleton manager pattern, but relies heavily on hardcoded game IDs and memory offsets that require frequent patch updates.