auth-portal/.opencode/skills/reui/rules/theming.md

Theming: styles, radius, density and sizes

Read your style

components.json style is <base>-<style>: the part after the first - names the style (base-nova is nova on Base UI). The style is baked into components/ui and components/reui at install, so the installed files hold your real values: read your installed button.tsx (usually components/ui/button.tsx) for heights, radius and padding before you build anything that sits beside a control.

The style ladder

Style	Button sm / default / lg	Button radius	Card radius, shadow	Card spacing	Button text
vega	h-8 / h-9 / h-10	rounded-md	rounded-xl, shadow-xs	6, sm 4	text-sm
nova	h-7 / h-8 / h-9	rounded-lg	rounded-xl	4, sm 3	text-sm
maia	h-8 / h-9 / h-10	rounded-4xl	rounded-2xl	6, sm 4	text-sm
lyra	h-7 / h-8 / h-9	rounded-none	rounded-none	4, sm 3	text-xs
mira	h-6 / h-7 / h-8	rounded-md	rounded-lg	4, sm 3	text-xs/relaxed
luma	h-8 / h-9 / h-10	rounded-4xl	rounded-4xl, shadow-md	6, sm 4	text-sm
sera	h-9 / h-10 / h-11	rounded-none	square, shadow-sm	8, sm 5	text-xs, uppercase
rhea	h-7 / h-8 / h-9	rounded-2xl	rounded-[min(var(--radius-4xl),24px)], shadow-sm	5, sm 4	text-sm

Card spacing is the --card-spacing step (--spacing(n)) a Card pads with; Card size="sm" uses the sm step. The default Button text weight is font-medium (sera: font-semibold).

What the style owns

• Never set what the style owns on its parts: radius (except rounded-full), height, horizontal padding, shadow, ring or font size. Pick size and variant instead.
• A panel is a Card or a Frame, never a div with rounded-*, border and bg-card; set density with Card size="sm" or Frame spacing.
• A bespoke element beside a control (a chip, a custom trigger) takes its height and radius from that control's row above.
• A focusable control you build copies the focus classes of your installed input.tsx.
• A variant before a class: className is for layout (placement, width, gap). size-* when width equals height, cn() for conditional classes (never a template literal), a scale step before an arbitrary value (w-60, not w-[240px]), no inline style for color or spacing, and no z-index on dialogs, sheets or popovers.
• Change the look through the theme CSS variables in :root and .dark (--radius, --primary and the rest) or with a style switch (a new style in components.json, which means reinstalling the components; ask the user first). Never edit installed files to restyle them.

Components with no per-style values

event-calendar, gantt, icon-stack, kanban, rating, scrollspy, sortable and timeline install the same file in every style. Their look comes from your theme tokens and the parts you put inside them (a Card in a kanban column follows the style), so never copy another style's radius onto them.