Patient Vital Signs Health Monitoring Dashboard

Create a patient vital signs dashboard with clinical-grade clarity. Three metric cards sit across the top displaying heart rate, blood pressure (systolic/diastolic), and oxygen saturation with large, easily readable numbers and subtle trend arrows. Below, a simple line chart spans the full width showing heart rate variability over 24 hours with exact time stamps and clear axis labels. The palette remains clean and reassuring: medical blue backgrounds, white text, coral for out-of-range values, mint green for normal ranges, and soft gray dividers. Every unit label is legible and consistent. Avoid placeholder text, overlapping elements, decorative clutter, and exaggerated visual effects.