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+---
+epic: 7
+story: 7.1
+title: "SwiftUI Two-Column Editor"
+status: draft
+---
+
+## Epic 7 — macOS App (Swift/SwiftUI)
+**Goal:** A beautiful, native macOS app that feels like it belongs on the platform.
+
+### Story 7.1: SwiftUI Two-Column Editor
+
+As a **macOS user**,
+I want a native two-column layout with an editor on the left and results on the right,
+So that I can see my calculations and their results side by side in a familiar, platform-native interface.
+
+**Acceptance Criteria:**
+
+**Given** the app is launched
+**When** the main window appears
+**Then** it displays a two-column layout: a text editor on the left and an answer column on the right
+**And** the editor uses a custom NSTextView-backed view with system font rendering
+
+**Given** the user types a calculation on line N in the editor
+**When** the engine evaluates the line
+**Then** the result appears on the corresponding line N in the right-hand answer column, vertically aligned
+
+**Given** the document has more lines than fit in the viewport
+**When** the user scrolls the editor
+**Then** the answer column scrolls in sync so that line alignment is always maintained
+
+**Given** the user has Dynamic Type set to a large accessibility size in System Settings
+**When** the app renders text
+**Then** both the editor and answer column respect the Dynamic Type setting and scale appropriately
+**And** the layout remains usable without truncation or overlap
+
+**Given** a document with 1000+ lines
+**When** the user scrolls rapidly
+**Then** scrolling is smooth (60 fps) with no visible jank or dropped frames