Design a premium and trustworthy logo for a healthcare brand named “Medivexis.” The logo should convey medical expertise, safety, trust, and innovation. Create a minimal modern symbol combining a medical cross and a DNA helix, representing advanced healthcare and science. Use clean geometric shapes and balanced symmetry to give a professional hospital-grade identity. Color palette should include deep medical blue, teal, and subtle silver accents to express reliability and premium quality. Typography should be modern sans-serif, elegant and readable, similar to professional healthcare brands. Style should be flat vector, minimal, high-end, corporate healthcare branding, white or soft gradient background, ultra clean, scalable, 4K resolution.