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docs/rack-planner/product-concept.md

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+# Product Concept
+
+## Problem
+
+There is no widely available, lightweight online tool focused on practical planning of `10"` and `19"` racks with a visual workflow, reusable components, and a usable bill of materials.
+
+Existing workflows are often split across:
+
+- CAD tools that are too heavy for simple planning
+- spreadsheets for the bill of materials
+- manual sketches for positioning
+- separate notes for cabling
+
+## Vision
+
+`code.it Rack Planner` should be a browser-based planning platform where users can:
+
+- create and save rack layouts online
+- visually place and move rack components
+- load manufacturer-specific or custom components as plugins
+- generate a bill of materials automatically
+- estimate cable lengths between ports or devices
+
+## Target users
+
+- system integrators
+- installers
+- IT administrators
+- AV and media technicians
+- control cabinet / small infrastructure planners
+- organizations documenting existing rack installations
+
+## Primary use cases
+
+1. Plan a new `19"` network rack with switch, patch panel, PDU, UPS, shelves, and servers.
+2. Plan a compact `10"` wall rack for small office or edge installations.
+3. Compare multiple rack variants with different hardware selections.
+4. Export a bill of materials for ordering.
+5. Estimate patch cable and power cable lengths based on mounting positions.
+
+## Functional goals
+
+- visual rack editor
+- component catalog
+- drag-and-drop placement
+- snap-to-unit positioning
+- collision and fit validation
+- bill of materials generation
+- import of additional component packs
+- optional cable planning and length estimation
+
+## Non-functional goals
+
+- runs in a modern browser
+- usable on desktop first, tablet second
+- clean project persistence
+- suitable for public internet deployment
+- secure plugin loading model
+- scalable enough for many concurrent users
+
+## Scope boundary
+
+The product should not try to replace full mechanical CAD in the first versions. The planning focus is:
+
+- layout
+- occupancy
+- compatibility
+- documentation
+- ordering support
+
+Mechanical precision modeling, freeform CAD editing, and simulation should remain outside the initial scope.