If your heart is set on CS 1.6’s exact mechanics, consider buying a cheap used Windows laptop or desktop. The cost and hassle of emulation on Mac rarely deliver the “high quality” you seek.
run directly via a simple DMG or Steam on modern macOS. You have two high-quality workarounds: Steam Community Xash3D FWGS (Native Port) counter strike 16 mac dmg download high quality
To ensure the best visual and performance quality once installed: If your heart is set on CS 1