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+---
+epic: 8
+story: 8.4
+title: "System Tray Mode"
+status: draft
+---
+
+## Epic 8 — Windows App (Rust + iced)
+**Goal:** Fast, lightweight native Windows app -- single .exe, no runtime dependencies.
+
+### Story 8.4: System Tray Mode
+
+As a **Windows user**,
+I want CalcPad to run in the system tray,
+So that it is always available without taking up taskbar space.
+
+**Acceptance Criteria:**
+
+**Given** the app is running
+**When** the user looks at the Windows system tray (notification area)
+**Then** a CalcPad icon is visible
+
+**Given** the tray icon is present
+**When** the user right-clicks the tray icon
+**Then** a context menu appears with options: Show, New Sheet, Recent Sheets (submenu), and Quit
+
+**Given** the tray icon is present
+**When** the user left-clicks the tray icon
+**Then** the main CalcPad window toggles visibility (shows if hidden, hides if shown)
+
+**Given** the user selects "New Sheet" from the tray menu
+**When** the action is processed
+**Then** the main window opens (if hidden) and a new empty sheet is created
+
+**Given** the user closes the main window (clicks the X button)
+**When** "background running" is enabled in settings
+**Then** the app minimizes to the tray instead of quitting
+**And** the tray icon remains active
+
+**Given** the user selects "Quit" from the tray context menu
+**When** the action is processed
+**Then** the app fully terminates (saves state and exits)
+
+**Given** "background running" is disabled in settings
+**When** the user closes the main window
+**Then** the app exits completely (no tray persistence)