Code quality improvements: fix HTML validation, enhance accessibility, refactor JavaScript

[Copilot]

Comprehensive code quality pass addressing HTML validation errors, accessibility issues, JavaScript duplication, and CSS redundancy.

HTML

• Fixed validation errors: duplicate href attribute, unclosed <span> tag
• Removed duplicate skills from list (15 → 8 unique items)
• Changed mobile menu from <div> to semantic <button> elements
• Added proper form attributes: id, name, type="email", required
• Improved alt text: "logo Image" → "John Anderson Profile", "Project Image" → "Project screenshot"
• Added ARIA labels: aria-label="Main navigation", aria-expanded for mobile menu state

JavaScript

• Refactored 75+ lines of duplicated menu animation code into reusable functions:

// Before: Repeated 3 times with hardcoded values
smMenuLink4.style.transitionDelay = '0s'
smMenuLink4.style.transform = 'translateY(50px)'
smMenuLink4.style.opacity = '0'
// ... repeated for each link

// After: Single reusable function
function animateMenuLinks(links, show) {
  const delays = [0.5, 0.8, 1.1, 1.4];
  links.forEach((link, index) => {
    link.style.transitionDelay = `${show ? delays[index] : delays.length - 1 - index}s`;
    link.style.transform = `translateY(${show ? '0' : '50px'})`;
    link.style.opacity = show ? '1' : '0';
  });
}

• Added null checks for all DOM queries
• Added JSDoc comments for all functions
• Fixed typo: headerLogoConatiner → headerLogoContainer
• Replaced obsolete eventFire function with native .click()
• Added smooth scroll behavior: scrollIntoView({ behavior: 'smooth' })

CSS

• Removed redundant border: none overridden by border: 2px solid
• Added button reset styles for mobile menu: background: none, border: none, cursor: pointer

Repository

• Added .gitignore for OS/editor files

Screenshots

Desktop

Mobile Menu

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Security: CodeQL scan passed (0 alerts)
Stats: -149 lines, +179 lines across 4 files

Original prompt

identify and suggest code improvements in this repo

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