A flat, 2D, front book cover design only. No 3D mockup, no perspective, no tilted angle, no spine visible. Strictly a straight-on, rectangular cover artwork. Design an ultra-minimalist and academic cover for a medical book titled: "Clinical Syndromes: Diagnosis, Differential, and Comorbidity in Complex Cases". Background: Solid, muted off-white (#F5F2EB) with a thin, clean rectangular border in charcoal gray. Main visual element (center of the cover): A precise geometric diagram using thin, sharp vector lines. Three perfectly overlapping transparent circles (Venn diagram style) in a muted deep medical blue (#1A3B5C), representing "Comorbidity". A single, bold vertical line (in charcoal gray #3A3A3A) cuts straight through the center of the overlapping circles, representing "Differential Diagnosis" – the act of separating and distinguishing. Typography layout: Top area (small, light font): "A Clinical Guide for Complex Presentations" in sans-serif, light gray. Middle area (main title): "CLINICAL SYNDROMES" in large, bold, serif font (e.g., Times New Roman style), dark charcoal. Below main title (subtitle): "Diagnosis, Differential & Comorbidity" in italic, medium-sized sans-serif, deep blue. Bottom area: "In Complex Cases" in small caps, charcoal gray. Style: Clean, sharp, clinical, textbook aesthetic. No textures, no gradients, no shadows, no 3D effects. Strictly flat vector graphics. High contrast, precise alignment, balanced composition. The overall feel must be serious, scholarly, and suitable for a medical reference book. Avoid: Human figures, brain scans, ECG lines, stethoscopes, DNA helixes, or any literal medical imagery. Keep it purely conceptual and geometric.