Classic Medical App Logo

I am building a nursing mobile app and need an elegant, timeless logo that will feel at home both on a small app icon and on future marketing material. The overall mood should be classic rather than ultra-modern, with a refined palette built around deep, coffee-brown tones (please avoid the typical blue-green healthcare look).

I do not want any text, stethoscopes, nurse caps, or other over-used medical clichés. If you wish to hint at the healthcare theme, do so through subtle, original shapes rather than literal symbols; abstract forms, negative space, or a minimalist crest could work well as long as the result still reads clearly at 512 × 512 px.

Acceptance criteria
• Primary logo mark in vector format (AI/SVG)
• App-icon-ready export at 1024 × 1024 px (PNG) plus a 512 × 512 px version
• Flat and monochrome variants for dark and light backgrounds
• Minimalist flat vector logo for a nursing clinical reference app called "Nurska". Warm, earthy color palette: dark coffee brown (#7E6754) for the letterform on a light beige background (#DFD3C9)
• Proof that the design scales cleanly and remains recognizable at small sizes

I am ready to provide quick feedback and can approve milestones as we refine sketches, pick the final concept, and polish the deliverables.