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docs: verify mobile bottom tab bar implementation (bf-om23)

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Verified that the mobile bottom tab bar specified in §16.4 is implemented
in web/index.html as inline styles, not in external CSS files.

The implementation matches specification:
- Four bottom tabs: Home, Watch, Compete, Board
- Persistent bottom tab bar on mobile (<640px)
- Proper z-index layering and responsive behavior

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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# Mobile Bottom Tab Bar Verification (bf-om23)
## Finding
The mobile bottom tab bar specified in §16.4 **IS implemented**, but its styles are located in `web/index.html` as inline styles rather than in the external CSS files (`base.css`, `mobile.css`, `components.css`).
## Implementation Location
**HTML Structure** (`web/index.html` lines 898-918):
```html
<!-- Mobile bottom tab bar -->
<div class="mobile-bottom-nav">
<div class="nav-links">
<a href="#/" class="nav-link">
<span>🏠</span>
<span>Home</span>
</a>
<a href="#/watch" class="nav-link">
<span>👀</span>
<span>Watch</span>
</a>
<a href="#/compete" class="nav-link">
<span>⚔️</span>
<span>Compete</span>
</a>
<a href="#/leaderboard" class="nav-link">
<span>🏆</span>
<span>Board</span>
</a>
</div>
</div>
```
**CSS Styles** (`web/index.html` lines 158-182, 229-236):
```css
/* Mobile bottom tab bar */
.mobile-bottom-nav {
display: none;
position: fixed;
bottom: 0;
left: 0;
right: 0;
background-color: var(--bg-secondary);
border-top: 1px solid var(--border);
padding: 8px 0;
z-index: 100;
}
.mobile-bottom-nav .nav-links {
justify-content: space-around;
width: 100%;
}
.mobile-bottom-nav .nav-link {
flex-direction: column;
padding: 6px 12px;
font-size: 0.75rem;
text-align: center;
}
/* Responsive */
@media (max-width: 639px) {
/* Show bottom tab bar */
.mobile-bottom-nav {
display: block;
}
/* Add padding to bottom of main content for bottom nav */
#app {
padding-bottom: 70px;
}
}
```
## External CSS References
The external CSS files reference `.mobile-bottom-nav` but do NOT define its styles:
- **`mobile.css` line 616**: Hides `.mobile-bottom-nav` on desktop (>1024px)
- **`mobile.css` line 711-718**: Minimal padding adjustments in landscape mode
- **`mobile.css` line 6**: Comment mentioning "bottom tab bar"
## Specification Compliance
The implementation matches §16.4 of the plan:
- Four bottom tabs: Home, Watch, Compete, Board
- Persistent bottom tab bar on mobile (<640px)
- Thumb-reachable, always visible
- Hidden on desktop/tablet
- Proper z-index layering (z-index: 100)
## Conclusion
**Status**: The mobile bottom tab bar is fully implemented and functional. The styles are inline in `index.html` rather than in external CSS files, which is a valid (though less modular) approach.
**Recommendation**: If desired for better code organization, the inline styles could be moved to `mobile.css`, but this is not necessary for functionality.