/* Keep the existing game iframe alive while the portal becomes a full-window table. */
html[data-game-focus="true"],body[data-game-focus="true"]{overflow:hidden;overscroll-behavior:none;overflow-anchor:none}
body[data-game-focus="true"]>.site-header,
body[data-game-focus="true"]>.menu-toggle,
body[data-game-focus="true"]>.menu-backdrop,
body[data-game-focus="true"]>.skip,
body[data-game-focus="true"] .site-footer,
body[data-game-focus="true"] .page-heading,
body[data-game-focus="true"] .back-link,
body[data-game-focus="true"] .original-copy,
body[data-game-focus="true"] .practice-rail{display:none}
body[data-game-focus="true"] #main.site-main{margin:0;width:100%;max-width:none;min-height:0;padding:0}
body[data-game-focus="true"] #main>.sr-only{display:none}
body[data-game-focus="true"] #game-zone{display:block;margin:0;padding:0;width:100%;min-width:0;gap:0}
body[data-game-focus="true"] .game-focus-shell{position:fixed;inset:0;z-index:1000;width:100%;height:var(--game-focus-height,100dvh);min-height:0;max-width:none;margin:0;padding:0;background:var(--bg);border:0;border-radius:0;overflow:hidden}
body[data-game-focus="true"] .game-focus-shell #chesser-frame{display:block;width:100%;height:100%!important;min-height:0;max-width:none;margin:0;padding:0;border:0;border-radius:0;background:var(--bg)}
.game-focus-shell:fullscreen{position:fixed;inset:0;display:block;width:100%;height:100%;min-height:0;margin:0;padding:0;border:0;border-radius:0;background:var(--bg);overflow:hidden}
.game-focus-shell:fullscreen #chesser-frame{display:block;width:100%;height:100%!important;min-height:0;margin:0;border:0;border-radius:0}
.game-focus-shell::backdrop{background:var(--bg,#181c24)}