Circuit

Act as an expert electronics engineer and technical writer. Create a complete, beautifully styled HTML guide for building a stereo audio amplifier circuit from scratch on a breadboard. 

Style it with embedded CSS (clean, modern, dark-mode or tech-themed design, responsive layout) and use inline SVG graphics for any circuit diagrams. Do not use external CSS or image links.

The guide must include the following sections:

1. **Header & Introduction**: Title, brief overview of how a basic audio amplifier works (using an LM386 dual setup or similar classic stereo op-amp configuration), and what the user will achieve.
2. **Safety & Prerequisites**: Essential workbench safety, tools needed (soldering iron is optional since it's breadboard, wire cutters, multimeter, audio source, speakers), and basic components knowledge.
3. **Complete Parts List**: A detailed bill of materials in a clean HTML table, including:
   - Component Name / Part Number (e.g., LM386 Low Voltage Audio Power Amplifier IC, 10µF capacitors, 220µF capacitors, 10k potentiometer, 8-ohm speakers, 9V battery or power supply, jumper wires, breadboard).
   - Quantity.
   - Purpose/Role in the circuit.
4. **Circuit Diagrams**: 
   - Provide clear, well-labeled schematic diagrams rendered using inline SVG.
   - Include both a schematic symbol view and a visual breadboard wiring guide view to help beginners map pin-to-pin connections.
5. **Step-by-Step Assembly Instructions**: Numbered, detailed steps guiding the user from placing the IC on the breadboard, adding power rails, decoupling capacitors, volume control potentiometer, audio input jack, to finally connecting the stereo speakers.
6. **Testing & Troubleshooting**: Common mistakes to watch out for (e.g., reversed polarity, loose grounds, feedback loops) and how to test the circuit safely before powering it up.

Ensure the HTML is clean, semantic, and visually polished with clear typography, code blocks or tables for parts, and well-designed SVG graphics.