Sumi Panel UI Kit — double-framed panels and buttons

Cel shading inverted: pale ink on a dark wash rather than dark ink on paper. The hard-edged terminator is the same shape in both families and it has to be — a soft falloff is the one thing cel shading cannot have — but a pale outline on black needs more weight than a dark one on white, and the second concentric frame gives the panel somewhere to put it.

Two nine-slice panels — a double-framed window frame with 14 px corners and a recessed inset frame with 12 px corners — cover almost every box a menu needs: dialogs, inventory grids, list backgrounds, tooltips and stat panels. Two concentric borders with a gap between them read as carved rather than drawn, which is what separates a crafted interface from a rectangle with a stroke. Both stretch cleanly to any size because the corners never scale and the centre is a flat fill.

On top of the panels sit four tab button states: default, hover, pressed and disabled. They are drawn on the same 120×48 base with 8 px corners, so you can swap the texture on a single button widget and get the whole interaction loop without moving a rectangle. The pressed state drops its face two pixels and removes the top highlight rather than just darkening, which is what makes a button feel clicked rather than merely recoloured.

Everything ships twice. The SVG sources are the files the kit was drawn in — open them, change the six charcoal wash tones or the single seal red accent, and re-export. The PNG exports are flat, transparent and pre-scaled at 1x, 2x and 4x for engines that want bitmaps, with no premultiplied alpha and no baked-in shadow outside the sprite bounds.

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