feat: Add CSS Spring Physics Accordion for Creative Portfolio Layouts…

[realtushartyagi]

Pull Request Description

Adds a new Example Component: CSS Spring Physics Accordion for Creative Portfolio Layouts.
This submission introduces a highly tactile, JavaScript-free accordion pattern built upon native HTML5 <details> and <summary> elements. Designed for premium creative portfolios, it replaces static linear animations with a sophisticated "Spring Physics" interaction model. This is achieved by manipulating modern CSS Grid transitions (grid-template-rows) using a custom cubic-bezier(0.34, 1.15, 0.64, 1) timing function that deliberately overshoots its target and settles back into place. Furthermore, the inner content features a secondary transform: translateY(20px) cascade, ensuring the text springs up into view slightly behind the main container expansion.

Fixes #33131

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Type of Change

• ✨ New animation / hover effect
• 🧩 New component
• 📝 Documentation improvement
• 🐛 Bug fix in an existing submission
• Other (describe below)

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Submission Checklist

⚠️ PRs that fail this checklist will be closed without review.

• All changes are inside submissions/examples/css-spring-physics-accordion-for-creative-portfolio-layouts-realtushartyagi-33131/
• Includes demo.html — self-contained, opens in browser with no server
• Includes style.css — raw CSS for the proposed feature
• Includes README.md — what it does, how to use it, why it fits EaseMotion CSS
• No changes to core/
• No changes to components/
• One feature per PR (no bundled unrelated changes)

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Feature Description

What does this add?

A pure CSS Accordion component tailored for creative portfolios, featuring a bouncy, physics-based expansion animation built entirely with custom cubic-bezier curves and CSS Grid.

How does a developer use it?

<!-- Requires only native HTML5 details/summary tags -->
<details class="ease-spring-accordion" name="portfolio-projects">
    <summary class="ease-spring-summary">
        <h2 class="project-title">Project Name</h2>
        <div class="ease-spring-indicator">
            <span class="indicator-line horizontal"></span>
            <span class="indicator-line vertical"></span>
        </div>
    </summary>
    <div class="ease-spring-content">
        <div class="ease-content-inner">
            <div class="project-details">
                <p>Case study content goes here.</p>
            </div>
        </div>
    </div>
</details>

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[SAPTARSHI-coder]

✅ Submission Validation Passed!

Great job! All required files are present and valid.

📁 Folder: submissions/examples/css-spring-physics-accordion-for-creative-portfolio-layouts-realtushartyagi-33131

Files found:

• ✅ demo.html
• ✅ style.css
• ✅ README.md

🚀 Next Steps:

• A maintainer will review your PR
• Respond to any feedback if requested
• Once approved, your contribution will be merged!

Thank you for contributing to EaseMotion CSS! 🎉

[SAPTARSHI-coder]

✅ Submission Validation Passed!

Great job! All required files are present and valid.

📁 Folder: submissions/examples/css-spring-physics-accordion-for-creative-portfolio-layouts-realtushartyagi-33131

Files found:

• ✅ demo.html
• ✅ style.css
• ✅ README.md

🚀 Next Steps:

• A maintainer will review your PR
• Respond to any feedback if requested
• Once approved, your contribution will be merged!

Thank you for contributing to EaseMotion CSS! 🎉

[github-actions]

🎉 Congratulations on your PR merge, @realtushartyagi! 🚀

Thank you so much for your valuable contribution to EaseMotion CSS! Your code is now merged into the main branch.

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[github-actions]

🎉 Pull Request Integrated!

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