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component
Surface background from the Panel scale (`surface.peak` → `surface.ground`, or `transparent`).
Border color at rest: `none`, `default`, `bold`, `muted`, or `accent`. The 1px line is always reserved when a border can appear, so changing it never shifts layout.
Border color while the surface is `active` — the explicit form of the ring `activeEmphasis` would otherwise pick. It holds through hover, so a `borderInteract` color can't steal it. `inherit` keeps whatever `activeEmphasis` chose; `none` clears it.
Border color on hover and press: `none`, `default`, `bold`, `muted`, or `accent`. Composes with `border`, e.g. a muted line at rest that turns bold on hover.
Visual emphasis. primary: solid accent surface with high-contrast text. secondary: feedback-tinted soft surface with accent text. tertiary: neutral surface with bold feedback text. muted: soft surface with muted border and dimmed text. ghost: transparent. adaptive: inherit ambient text color.
Semantic color tone: `neutral`, `primary`, `success`, `warning`, `danger`, or `inherit`.
When true, a child SVG icon stretches to fill the entire stamp container instead of sizing to the stamp's font size.
Shape of the stamp. square uses the size's border radius; circle rounds to a full circle.
Size variant, matching Button. xs: extra small. sm: small. md: default. lg: large. xl: extra large.
Frosted glass: the chosen `background` step at /35 with a large backdrop blur, so content behind the panel shows through. A transparent background stays transparent.
Inner padding from the spacing scale.
Corner radius from the radii scale (`full` for fully rounded). `inner` computes a concentric corner from the parent panel's radius minus its padding; `inherit` mirrors the parent's corner exactly, for a child that sits flush with its edge.
Corner radius for the bottom-left and bottom-right corners.
Corner radius for the top-left and bottom-left corners.
Corner radius for the top-right and bottom-right corners.
Corner radius for the top-left and top-right corners.
Keep (or drop) the always-1px transparent border the panel reserves so a border appearing or changing never shifts layout. Computed automatically — it's reserved when a resting `border` is visible, or when `interactive` / `borderInteract` / `active` can change the border at runtime. Set `false` only on a panel that must not occupy that 1px (e.g. a borderless housing frame that would otherwise add 2px around a set).
Opt the surface into the baseline rhythm. The root takes one whole raster line of padding on every edge and its text slots round their leading UP to a whole number of lines, so the box's height comes out as a whole number of lines without anyone setting a height. Inert when off — a surface rendered without it is byte-identical to before. An ancestor scope (a `<Grid rhythm>`, any `[data-rhythm]`) quantises the text without this prop; the prop is what also puts this box on the raster.
Mark this as the chosen one in a set (a current nav item, a checked option, a selected card). Where `interactive` says it *can* be clicked, `active` says it *is* the current choice. Use `activeEmphasis` to control how loud the state is. Combined with `interactive`, hover and press restart their stepping from the active baseline rather than falling back to the unchosen ramp. The four values differ only in what drives the state: `true` by the prop (via `data-panel-active`), `"checked"` by a wrapped native input (`:has(input:checked)` — zero JS, nothing to re-render), `"current"` by an existing `aria-current` on the panel, and `"current-within"` by an `aria-current` on a direct child (a split nav row whose link carries it).
How loud the `active` state is. Defaults to the panel's own `emphasis`, so the chosen state lands on the same ramp as the resting look — this prop is the override for when the active item should be louder (or quieter) than the panel itself. `"primary"` fills with the feedback accent ramp and flips text to the contrast scale (~150 RGB units of separation — the option that reads at a glance in a dense list). `"secondary"` tints the feedback surface ramp and `"tertiary"` the neutral ramp; both promote text to `bold` and lift the border to the default line, but move the surface only ~7–18 units.
Per-slot style and attribute override bag. Each slot accepts a `style` (SystemStyleObject) merged into the slot's class and a `props` object spread onto the element.
Plus all standard <span> HTML attributes.