feat: css core

[tintungtang]

Refine variables
Add font and spacing ultilities
Add base layout style

Closes #

📑 Description

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed
• The dependencies in package.json are correct and necessary (no unused or missing package)

ℹ Additional Information

[github-actions]

Coverage Report for Style Sheet

Status	Category	Percentage	Covered / Total
🔵	Lines	20.36%	79 / 388
🔵	Statements	20.36%	79 / 388
🔵	Functions	41.17%	7 / 17
🔵	Branches	51.72%	15 / 29

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
apps/nt-stylesheet/examples/main.js	0%	0%	0%	0%	1-18
apps/nt-stylesheet/src/scripts/nt-style.ts	0%	0%	0%	0%	1-3
apps/nt-stylesheet/src/scripts/scss-generator.ts	0%	0%	0%	0%

Generated in workflow #68 for commit ef0555a by the Vitest Coverage Report Action

[github-actions]

Coverage Report for Headless UI

Status	Category	Percentage	Covered / Total
🔵	Lines	58.03%	1369 / 2359
🔵	Statements	58.03%	1369 / 2359
🔵	Functions	52.72%	29 / 55
🔵	Branches	84.66%	127 / 150

File Coverage

No changed files found.

Generated in workflow #68 for commit ef0555a by the Vitest Coverage Report Action

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