Section

`"center"` centres eyebrow, title and description over the rail and moves `actions` and `aside` under them; `"start"` is the header row as it always was.

Only used when there is no `title` and no `Section.Title`: the title, when present, names the region.

What sits beside the actions on the header row, to their left. Equivalent to `Section.Aside`.

The body. A `Section.Header` among the children replaces the header built from `title`, `description`, `aside` and `actions`; a `Section.Footer` replaces `footer` (ADR-111).

Maximum width of the inner rail; the band still spans the full width.

A rule inside the rail, so it does not cross the band from edge to edge of the screen.

What renders in place of the content when `isEmpty`. Without `isEmpty` it never renders.

Replaces the content. A string is wrapped in an error `Alert` that announces itself.

The small label OVER the title — «Cómo funciona», «Planes» — that every landing band opens with (ADR-189). A string or a node becomes a `Section.Eyebrow`, a light `Badge`; an element is rendered as it comes. It sits outside the title, so the region's name stays the title alone.

The glass band of ADR-082, the lowest step. Use it ALTERNATING sections: turning it on everywhere gives you a uniform background, which is the opposite of the effect.

Turns on the `empty` branch. `error` wins over it: with an error, the empty state does not render.

Lays the loading veil over the content WITHOUT removing it, so the page does not jump when it ends.

Heading level of the title, 2 to 6. Structure, not size: the size is `fz`.

Animates the band in when it first scrolls into view. `true` takes the catalogue entrance — `slide-up` over 24 px on the `gentle` spring — and an object tunes it. It takes an object rather than a sibling `revealProps` for two reasons: it is the same shape `Box` accepts, so a band and a card are configured alike; and a name ending in `Props` promises a slot that gets spread onto an element, which this is not — it is read by a hook.

What actually moves when `reveal` is on. - `"surface"` animates the whole band, its background and its glass included, so the strip slides in as one piece. - `"content"` leaves the band where it is and lifts only the rail — the header, the body and the footer — into it. On a band with `glass` this is usually what you want: the band is the page's structure and the content is what should arrive.

Names the region through `aria-labelledby`, which is why it beats `aria-label`. Without it, and without a `Section.Title` among the children, the band falls back to `aria-label`.