Button

The .c-button is the canonical action control. Use a native <button> (or an <a> only when it is genuinely navigation). All visuals flow through component-local --c-button-* aliases that default to framework semantic tokens, so you can theme one button or all of them without leaving the component.

When to use what

Primary - one per view; the main forward action (“Save”, “Create”).
Secondary - co-equal or alternative actions (“Cancel”, “Export”).
Ghost - low-emphasis actions in dense toolbars, or on colored surfaces.

Semantic HTML

<button class="c-button" data-variant="primary">Save changes</button>
<button class="c-button" data-variant="secondary">Cancel</button>
<button class="c-button" data-variant="ghost" aria-pressed="true">
  Preview
</button>

Class contract

Selector	Role
`.c-button`	The component (native `<button>` or `<a>`).
`[data-variant]`	`primary` \| `secondary` \| `ghost` (default = none, white surface with border).

Tokens consumed

--pl-color-{accent,accent-text,accent-hover,surface,surface-2,text,border}, --pl-control-{block-size,padding-inline,gap,border-width,radius}, --pl-duration-1, --pl-ease-standard.

Tokens exposed (component-local)

Token	Default	Purpose
`--c-button-bg`	`--pl-color-surface`	Fill. Variants override.
`--c-button-fg`	`--pl-color-text`	Label color.
`--c-button-border`	`--pl-color-border`	Border color.
`--c-button-highlight`	`transparent`	Inset top-catch; `oklch(100% 0 0 / 12%)` on primary.

States

State	How	Behavior
default	-	variant fill
hover	`:hover`, `[data-hover]`	`color-mix()` shade (theme-aware), pointer
active	`:active`	`translateY(1px)` dip
pressed	`[aria-pressed="true"]`	dip + (ghost/secondary) faint accent tint
focus-visible	`:focus-visible`	token outline (from base; never removed)
disabled	`:disabled`, `[aria-disabled="true"]`	0.55 opacity, `not-allowed`, no highlight

Accessibility

Keyboard: native <button> → Enter/Space activate; focus ring is the base-layer :focus-visible outline (token color/size/offset). Never removed.
Disabled vs aria-disabled: disabled removes the button from the activation path entirely; aria-disabled="true" keeps it focusable (use when you want to announce “disabled” but still show a tooltip).
Icon-only: provide an aria-label.
Contrast: primary uses --pl-color-accent + --pl-color-accent-text (AA in both themes - see the contrast test).

Theme, density, RTL, motion

Light/dark: tokens resolve via light-dark(). Hover shade is theme-aware by construction (color-mix with --pl-color-text).
Density: sizing comes from --pl-control-block-size; set [data-density] on an ancestor - no per-component work.
RTL: no physical properties; icon + label order follows the writing mode.
Reduced motion: the transform/box-shadow transitions are zeroed by the themes layer’s motion guard (--pl-motion-scale: 0).
Forced colors: falls back to ButtonBorder / Highlight / HighlightText.