Fix: Mobile navigation drawer overlay is pierced by page headings

[Shrutiii01]

Description

This PR addresses and completely resolves [Bug]: Mobile navigation drawer overlay is pierced by page headings (z-index issue) #1799.

When opening the mobile navigation or sidebar drawer on documentation pages, main markdown article headings and dynamically generated text labels were piercing through the sliding menu panel. This PR enforces a strict stacking priority baseline, completely isolating the responsive menu framework over the document workspace content.

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🚀 Key Changes Implemented

1. Enforced Component Stacking Priority (Commit: 6d66c34)

• Resolved Header Z-Index Bleed: Targeted the global documentation Markdown wrapper layout rules to enforce a baseline layering scale (z-index: 1 !important). This stops relatively positioned headers (h1, h2, h3) from breaking their container boundaries.
• Maximized Responsive Drawer Priority: Elevated Docusaurus mobile layout drawer containers (.theme-doc-sidebar-container, .menu--responsive) and dynamic module wrapper strings up to a secure stacking context (z-index: 200 !important).
• Opaque Backdrop Masking: Applied an explicit solid background override using native theme variables (var(--ifm-background-color)) onto the active responsive sliding drawer. This completely blocks out and hides underlying document labels when the drawer is toggled.
• Layered Backdrop Blur Context: Normalized the dim overlay mask layer context (z-index: 199 !important) to guarantee background content remains unreadable while the menu panel viewport is active.

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🔍 Verification & Testing

• Prristine Commits Verification: Branch split cleanly from the master code baseline to track an isolated, single-commit layout delivery stream.
• Cross-Viewport Responsiveness Testing: - Tested locally down to Mobile S frame widths (320px) across deep nested documentation paths (/docs/).
  • Verified that dynamic text markers (e.g., Git Cheatsheet header components) are fully masked by the background color block and stay anchored behind the menu panel.

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Checklist

• My code follows the style guidelines of this project
• This PR contains exactly one isolated commit for clean upstream tracking
• Tested changes across light and dark system color presets
• Verified zero layout degradation across standard desktop viewport constraints

[vercel]

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[github-actions]

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[github-actions]

✅ Synchronized metadata from Issue #1799:

• Labels: level 1, recode, Enhacement, level2, medium, gssoc:approved, type:docs
• Milestone: recode:launch 3.0

[Karanjot786]

Hey @Shrutiii01! Saw your work on GSSoC 2026.

We are building TermUI, a TypeScript terminal UI framework with React-style hooks and JSX, rendered entirely in the terminal.

We have 55 unassigned GSSoC issues open, including well-scoped bug fixes with clear repro steps. Your TypeScript background transfers directly.

• Open issues (GSSoC 2026)
• TermUI on GSSoC

Karanjot, TermUI maintainer

[Adez017]

@sanjay-kv lets verify the changes with the vercel CI