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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)