Update static/css/styles.css and templates/base.html to refactor the navigation bar structure and styling, changing CSS selectors from 'nav' and 'nav-container' to '.navbar' and '.navbar-inner', and restructuring the HTML in base.html to accommodate the new class names and layout.
Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 5e584ab0-c340-4432-97ef-1972582b60e9
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: 050566e5-f5ef-4500-9a02-b484207b4148
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