script.js

// Smooth Scrolling for Navigation Links
document.querySelectorAll('a[href^="#"]').forEach(anchor => {
    anchor.addEventListener('click', function (e) {
        e.preventDefault();
        const target = document.querySelector(this.getAttribute('href'));
        if (target) {
            target.scrollIntoView({
                behavior: 'smooth',
                block: 'start'
            });
        }
    });
});

// Navbar Background on Scroll
const navbar = document.querySelector('.navbar');
let lastScroll = 0;

window.addEventListener('scroll', () => {
    const currentScroll = window.pageYOffset;

    // Add shadow when scrolled
    if (currentScroll > 50) {
        navbar.style.boxShadow = '0 2px 10px rgba(0, 0, 0, 0.3)';
    } else {
        navbar.style.boxShadow = 'none';
    }

    lastScroll = currentScroll;
});

// Active Navigation Link on Scroll
const sections = document.querySelectorAll('section[id]');
const navLinks = document.querySelectorAll('.nav-link');

function updateActiveLink() {
    const scrollPosition = window.scrollY + 100;

    sections.forEach(section => {
        const sectionTop = section.offsetTop;
        const sectionHeight = section.offsetHeight;
        const sectionId = section.getAttribute('id');

        if (scrollPosition >= sectionTop && scrollPosition < sectionTop + sectionHeight) {
            navLinks.forEach(link => {
                link.classList.remove('active');
                if (link.getAttribute('href') === `#${sectionId}`) {
                    link.classList.add('active');
                }
            });
        }
    });
}

window.addEventListener('scroll', updateActiveLink);

// Fade-in Animation on Scroll
const observerOptions = {
    threshold: 0.1,
    rootMargin: '0px 0px -50px 0px'
};

const observer = new IntersectionObserver((entries) => {
    entries.forEach(entry => {
        if (entry.isIntersecting) {
            entry.target.style.opacity = '1';
            entry.target.style.transform = 'translateY(0)';
        }
    });
}, observerOptions);

// Observe elements for fade-in effect
const animateElements = document.querySelectorAll(
    '.timeline-item, .award-item, .research-item, .experience-item, ' +
    '.project-card, .skill-category, .activity-card, .contact-card'
);

animateElements.forEach(el => {
    el.style.opacity = '0';
    el.style.transform = 'translateY(20px)';
    el.style.transition = 'opacity 0.6s ease, transform 0.6s ease';
    observer.observe(el);
});

// Add smooth reveal for section titles
const sectionTitles = document.querySelectorAll('.section-title');
sectionTitles.forEach(title => {
    title.style.opacity = '0';
    title.style.transform = 'translateY(30px)';
    title.style.transition = 'opacity 0.8s ease, transform 0.8s ease';
    observer.observe(title);
});

// Copyright Year Auto-Update
const footer = document.querySelector('.footer p');
if (footer) {
    const currentYear = new Date().getFullYear();
    footer.innerHTML = `&copy; ${currentYear} Ahhyun Lucy Lee. All rights reserved.`;
}

// Scroll Progress Indicator (optional - can be enabled)
function createScrollProgress() {
    const progressBar = document.createElement('div');
    progressBar.className = 'scroll-progress';
    progressBar.style.cssText = `
        position: fixed;
        top: 0;
        left: 0;
        width: 0%;
        height: 3px;
        background: linear-gradient(90deg, #6b1f3a, #9d5c71);
        z-index: 10000;
        transition: width 0.1s ease;
    `;
    document.body.appendChild(progressBar);

    window.addEventListener('scroll', () => {
        const windowHeight = document.documentElement.scrollHeight - document.documentElement.clientHeight;
        const scrolled = (window.scrollY / windowHeight) * 100;
        progressBar.style.width = scrolled + '%';
    });
}

// Uncomment the line below to enable scroll progress indicator
// createScrollProgress();

// Typing Effect for Hero Title (optional)
function typeWriter(element, text, speed = 100) {
    let i = 0;
    element.innerHTML = '';

    function type() {
        if (i < text.length) {
            element.innerHTML += text.charAt(i);
            i++;
            setTimeout(type, speed);
        }
    }

    type();
}

// Uncomment to enable typing effect on page load
// const heroTitle = document.querySelector('.hero-title');
// if (heroTitle) {
//     const originalText = heroTitle.textContent;
//     window.addEventListener('load', () => {
//         typeWriter(heroTitle, originalText, 80);
//     });
// }

// Mobile Menu Toggle (for future mobile enhancement)
function createMobileMenu() {
    const navContainer = document.querySelector('.nav-container');
    const navMenu = document.querySelector('.nav-menu');

    // Create hamburger button
    const hamburger = document.createElement('button');
    hamburger.className = 'hamburger';
    hamburger.innerHTML = '<i class="fas fa-bars"></i>';
    hamburger.style.cssText = `
        display: none;
        background: none;
        border: none;
        color: var(--white);
        font-size: 1.5rem;
        cursor: pointer;
        padding: 0.5rem;
    `;

    // Add hamburger to nav
    navContainer.appendChild(hamburger);

    // Toggle menu on mobile
    hamburger.addEventListener('click', () => {
        navMenu.classList.toggle('active');
    });

    // Close menu when link is clicked
    document.querySelectorAll('.nav-link').forEach(link => {
        link.addEventListener('click', () => {
            navMenu.classList.remove('active');
        });
    });

    // Show/hide hamburger based on screen size
    function checkScreenSize() {
        if (window.innerWidth <= 768) {
            hamburger.style.display = 'block';
        } else {
            hamburger.style.display = 'none';
            navMenu.classList.remove('active');
        }
    }

    window.addEventListener('resize', checkScreenSize);
    checkScreenSize();
}

// Initialize mobile menu
createMobileMenu();

// Console message for developers
console.log('%c👋 Hello! Thanks for checking out my website!', 'color: #6b1f3a; font-size: 16px; font-weight: bold;');
console.log('%cInterested in the code? Check out the repository!', 'color: #9d5c71; font-size: 14px;');