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calctext/_bmad-output/implementation-artifacts/8-7-windows-theming.md
2026-03-16 19:54:53 -04:00

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---
epic: 8
story: 8.7
title: "Windows Theming"
status: draft
---
## Epic 8 — Windows App (Rust + iced)
**Goal:** Fast, lightweight native Windows app -- single .exe, no runtime dependencies.
### Story 8.7: Windows Theming
As a **Windows user**,
I want CalcPad to match the Windows system theme including dark/light mode and accent colors,
So that the app looks like a native Windows 11 application.
**Acceptance Criteria:**
**Given** Windows is set to Light mode
**When** CalcPad launches
**Then** the app renders with a light theme
**Given** Windows is set to Dark mode
**When** CalcPad launches
**Then** the app renders with a dark theme
**Given** the system theme changes while CalcPad is running
**When** the registry key for `AppsUseLightTheme` changes
**Then** CalcPad detects the change and transitions to the new theme without restart
**Given** the user has a custom accent color set in Windows Settings
**When** CalcPad renders interactive elements (selections, focused borders, buttons)
**Then** the system accent color is used for those elements
**Given** the app is running on Windows 11
**When** the window renders
**Then** the custom iced theme approximates the Mica or Acrylic material design where feasible (or uses a flat theme that harmonizes with Windows 11 aesthetics)
**Given** the app is running on Windows 10
**When** the window renders
**Then** the theme degrades gracefully (no Mica/Acrylic, but still matches light/dark mode)