Design a modern, professional healthcare logo for a brand named “MedNova”, optimized for use on a black or very dark background. The logo should feel clean, futuristic, and trustworthy, suitable for a medical hospital, healthcare platform, or health-tech company. Incorporate a medical symbol such as a cross, heartbeat line, stethoscope, or abstract human-care icon, subtly blended with a modern tech-inspired element to represent innovation and progress. Color palette: medical blue, deep navy blue, white, with optional soft cyan accents for highlights. The logo must have strong contrast against a black background, with white or light-colored elements clearly visible. Style: minimal, flat, premium, clean vector design — no gradients, no shadows. Typography: modern sans-serif, bold but friendly, high readability, professional healthcare branding. Background: solid black or transparent. No mockups, no 3D effects, no textures — pure vector-style logo, suitable for website header, mobile app icon, and branding.