# llimphi-widget-panel

The cross-cutting visual signature of tawasuyu panels.

It contributes two details that, applied consistently, make the system
recognizable without looking "designed":

1. **A nearly imperceptible vertical gradient** — the panel background is not a
   solid colour but a linear interpolation between a slightly lighter version
   (top) and a slightly darker one (bottom) of the base colour. The difference is
   ~4% in value — invisible at first glance, but the eye registers it as "carved"
   rather than "painted".

2. **A hairline accent on the top edge** — a 1px horizontal line in the theme's
   accent colour at ~30% alpha, right at the panel's upper border. It works as an
   "identity thread" stitching every panel of the system together: it appears in
   modals, dropdowns, cards and sidebars; always the same thickness, always the
   same colour.

## API

- `PanelStyle` — the token bundle (base colour, accent, radius, hairline alpha,
  gradient strength).
- `panel_signature_painter` — an `Fn` for `View::paint_with`. Useful when you
  already have a configured View and want to add the signature without wrapping.
- `panel_view` — convenience: builds the complete View with the signature
  applied, taking the children as `Vec<View<Msg>>`.

## When to use it

- YES: modals, dropdowns, prominent cards, layout columns, shortcuts-help,
  floating panels.
- NO: chips, badges, toasts, list items (the signature is for large surfaces; on
  small pieces it is noise).

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Part of **llimphi** — see [llimphi](../../README.md).