Hey There,
As a top-rated full-stack developer with over nine years of experience, I can confidently say that I'm the ideal fit for your project. My proficiency in CSS, HTML, PHP, and WordPress align perfectly with your requirements. Over time, I've completed more than 550 projects to the satisfaction of my clients, giving me an accuracy rate of almost 100%. On top of this relevant skill set, my background in Mobile App Development (including React Native), E-Commerce platforms (Shopify, Magento, Woocommerce), and API's integration (Amazon AWS) lends me a unique perspective in fully understanding and documenting any aspect of your custom WordPress theme.
My approach to your project involves combining technical know-how with common sense. It's about identifying and explaining what may not be obvious without overwhelming anyone with unnecessary verbosity. Additionally, being a team player who values effective communication, I'll ensure to seek clarifications on any areas that may require detailed documentation.
Importantly, you mentioned being open to bug fixes; something I can certainly handle given my holistic skillset. This means that during the documentation process, if any issues arise or improvements need implementing spotted by someone who truly understands your theme - themselves - I can address them promptly and or propose solutions quickly keeping things organized.