Smart Inventory System

Most inventory assets ask you to build your game their way. This one is designed to disappear into a project that already exists. The logic layer is plain C# that cannot reference UnityEngine at all — that is an assembly setting, not a promise. Above it sit thin MonoBehaviour adapters, a uGUI layer you can replace outright, and a persistence layer that hands you a serializable snapshot and gets out of the way. Your save system stays yours. Your UI stays yours. What that buys you in practice: • Items resolve by id at runtime, so renaming, moving or re-importing a ScriptableObject never invalidates a save file. • Any rule you can think of — weight, category, quest state, player level — is a one-method interface that returns a reason string you can show the player. Weight and category rules ship as working examples. • Equipment is not a second system. It is an ordinary container carrying per-slot restrictions, so it inherits events, saving, grid rendering, drag and drop and tooltips without a line of equipment-specific UI code. • The drop highlight is produced by the same calculation that performs the drop, so a green slot is never followed by a refusal. Measured on a 2019 i5 laptop, every gameplay operation — add, remove, move, transfer, drop preview — runs in well under a microsecond and allocates zero bytes, so dragging items around cannot contribute to a GC spike. A full 200-slot inventory serialises to 8.5 KB. Open the included demo scene and press Play. There is nothing to configure first. Deliberately not in this version: crafting, vendors, loot tables, durability, hotbar widgets and gamepad navigation. The architecture leaves hooks for all of them and none is half-present in the package. Requires TextMeshPro Essential Resources (Window > TextMeshPro > Import TMP Essential Resources).