009.【Markdown Basics】⚙️ _config.yml and style.css Are Document Specifications

📌 Position of This Article

This article defines the prerequisites for document specification files
required in addition to the Markdown content itself.

⚙️ The Role of _config.yml

_config.yml is not merely a configuration file.
It is the specification definition for the entire document set.

Its main roles are as follows:

• 🧩 Fixing Markdown interpretation rules
• 📐 Defining LaTeX formula rendering conditions
• 🗂 Fixing site structure and URL structure

🎨 The Role of style.css

style.css is not for decoration.
It is a specification that controls readability and information density.

The controlled elements include:

• 🧱 Visibility of heading hierarchy
• 💻 Line spacing and font size of code blocks
• 📐 Margins around mathematical formulas

❓ Why They Are Treated as Specifications

If these settings depend on individuals, the following problems occur:

• Document readability becomes inconsistent
• Materials cannot be reused as educational content
• 🤖 The structure read by AI systems changes every time

By fixing them as specifications, these issues are avoided.

✅ Prerequisite Conclusion

In this project, the following rule is fixed as a prerequisite:

Markdown content
＋ _config.yml
＋ style.css
are treated as a single document specification set.

🔗 Related Prerequisite Articles

• 007.【Markdown Basics】: Markdown Is the Standard Format for Practical Documents
• 008.【Markdown Basics】: GitHub Pages Is the Execution Environment for Markdown