Create a clean production-ready SVG logo mark suitable as a header icon, app icon, and favicon. An abstract, balanced emblem built from simple geometric shapes with a symmetrical silhouette that remains legible at small sizes. Use thin-to-medium strokes with rounded caps and joins. Color palette: copper #B86A38 and brass #C7A15A for the main mark; ember accent #D97B2F sparingly for highlight. Provide an optional graphite/dark version using #1F1A17. Style: flat vector, no gradients or textures, crisp edges, scalable down to favicon size (16x16). The design should avoid text, be clean, modern, and production-ready. Output as a single, self-contained SVG file; ensure robust readability at small scales and compatibility with both light and dark UI.

The image shows a white background with a brown cross in the middle, which is the logo for the game 'X'. The cross is composed of two distinct shapes, one in the center and one on either side, and is surrounded by a thin black border.