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+---
+epic: 8
+story: 8.1
+title: "iced Two-Column Editor"
+status: draft
+---
+
+## Epic 8 — Windows App (Rust + iced)
+**Goal:** Fast, lightweight native Windows app -- single .exe, no runtime dependencies.
+
+### Story 8.1: iced Two-Column Editor
+
+As a **Windows user**,
+I want a two-column editor with input on the left and results on the right, rendered with GPU acceleration,
+So that I get a fast, smooth editing experience even with large documents.
+
+**Acceptance Criteria:**
+
+**Given** the app is launched on Windows
+**When** the main window appears
+**Then** it displays a two-column layout: a custom `TextEditor` widget on the left for input and aligned `Text` widgets on the right for answers
+
+**Given** the user types a calculation on line N
+**When** the engine evaluates the line
+**Then** the result appears aligned on line N in the answer column
+
+**Given** the system has a GPU with wgpu support
+**When** the app renders
+**Then** it uses GPU-accelerated rendering via wgpu for smooth text and UI rendering
+
+**Given** the system does not have compatible GPU support (e.g., older hardware, VM, RDP session)
+**When** the app starts
+**Then** it falls back to software rendering via tiny-skia without crashing or user intervention
+
+**Given** a document with 1000+ lines
+**When** the user scrolls and edits
+**Then** the app maintains 60 fps with no perceptible lag
+
+**Given** the user resizes the window
+**When** the layout recalculates
+**Then** the two columns adjust proportionally and text reflows appropriately