Based on the current state of the Wet Lab Calculator, here are some targeted suggestions for improvement:

1. Dark Mode Toggle Add a light/dark mode switch. Scientists often work late in the lab, and a dark mode would reduce eye strain. The theme provider is already in the codebase but isn't wired up with a toggle.

2. Formula Reference Tooltips Add small info icons next to each calculator title that reveal the underlying formula (e.g., C1V1 = C2V2 for dilution). Helps users verify the math and serves as a learning tool for students.

3. Calculation History Log Add a collapsible sidebar or panel that records every calculation with a timestamp. Users could scroll back, re-load a past calculation, or export their session log for lab notebook documentation.

4. Input Validation Warnings Add smarter contextual warnings, such as flagging unusually high concentrations, volumes beyond typical lab ranges, or molecular weights that don't match common reagents. This catches typos before they waste reagents.

5. Export Protocol as PDF Add a "Generate Protocol" button that creates a printable summary of the calculation with all inputs, outputs, and step-by-step instructions for lab notebook records.

6. Common Reagent Database Pre-populate a searchable database of common reagents (NaCl, Tris, EDTA, etc.) with their molecular weights, so users don't have to look them up manually.

7. Unit Converter Utility Add a standalone quick-convert tool for common lab unit conversions (g to mg, L to mL, M to mM, etc.) accessible from any calculator tab.

8. Keyboard Shortcuts Add Tab to move between fields, number keys 1-6 to switch calculator tabs, and Ctrl+Enter to copy the result. Speeds up repetitive workflows significantly.

Would you like me to implement any of these?

Now I have a thorough understanding of the codebase. Let me build the Unit Converter Utility first, then the Export Protocol as PDF feature. I'll create the Unit Converter as a new tab in the navigation, and the Export Protocol as a reusable component that can be added to each calculator.

Now let me add the Unit Converter tab to the main page and update the gradient in globals.css.

Unit Converter is done. Now let me move on to the Export Protocol as PDF feature.

Now I'll build the Export Protocol component that generates a printable protocol summary. I'll use the browser's window.print() API with a styled print-ready layout, which is the most reliable approach without requiring heavy PDF libraries.

Now I need to integrate the Export Protocol button into each of the 5 calculators. Let me update them all.

Both features are now complete. The Unit Converter is available as a new "Converter" tab in the navigation, supporting mass (kg through pg), volume (L through pL), concentration (M through fM), and temperature (C/F/K) conversions with live results, a swap button, and an "All Conversions" grid that shows every unit at once. The Export Protocol button appears in each calculator's control bar when results are available -- it opens a professionally formatted, print-ready protocol in a new window with input parameters, calculated results, numbered protocol steps, the formula used, signature lines, and a notes section, ready to save as PDF via the browser's print dialog.