/** The SGR escape that turns ON the distinct-surface background (theme
 *  `selectedBg`), e.g. `\x1b[48;2;58;58;74m`. Pair with `\x1b[49m` to reset just
 *  the background. Throws if no process has initialized the theme — callers on a
 *  render path (the attach overlay) always have, by construction. */
export declare function surfaceBgAnsi(): string;
/** tmux flags that frame a `display-menu` / `display-popup` on the distinct
 *  surface background — a rounded border + the surface bg on the body and border.
 *  Empty when the theme is unavailable in this process (chrome stays default; the
 *  attach viewer re-installs the menu with these once it has themed). One knob:
 *  every crtr tmux float shares this single definition. */
export declare function surfaceTmuxStyleArgs(): string[];