script.js

// Show/hide tabs
function showTab(tabId) {
    // Hide hero section
    document.querySelector('.hero').style.display = 'none';
    
    // Hide all tab sections
    document.querySelectorAll('.tab-section').forEach(section => {
        section.classList.remove('active');
    });
    
    // Show selected tab
    document.getElementById(tabId).classList.add('active');
    
    // Update active nav link
    document.querySelectorAll('.nav-link').forEach(link => {
        link.classList.remove('active');
    });
    event.target.classList.add('active');
    
    // Scroll to top
    window.scrollTo(0, 0);
}

function showHome() {
    // Show hero section
    document.querySelector('.hero').style.display = 'flex';
    
    // Hide all tab sections
    document.querySelectorAll('.tab-section').forEach(section => {
        section.classList.remove('active');
    });
    
    // Remove active from all nav links
    document.querySelectorAll('.nav-link').forEach(link => {
        link.classList.remove('active');
    });
    
    // Scroll to top
    window.scrollTo(0, 0);
}

// Smooth scrolling for navigation links
document.querySelectorAll('a[href^="#"]').forEach(anchor => {
    anchor.addEventListener('click', function (e) {
        e.preventDefault();
    });
});

// Navbar background change on scroll
const navbar = document.querySelector('.navbar');
let lastScroll = 0;

window.addEventListener('scroll', () => {
    const currentScroll = window.pageYOffset;
    
    if (currentScroll > 100) {
        navbar.style.boxShadow = '0 4px 12px rgba(0, 0, 0, 0.1)';
    } else {
        navbar.style.boxShadow = '0 4px 6px rgba(0, 0, 0, 0.1)';
    }
    
    lastScroll = currentScroll;
});

// Intersection Observer for fade-in animations
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 all project cards and skill categories
document.addEventListener('DOMContentLoaded', () => {
    const animatedElements = document.querySelectorAll('.project-card, .skill-category');
    
    animatedElements.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);
    });
});

// Toggle project description box
function toggleProject(projectId) {
    const content = document.getElementById(projectId);
    const btn = content.querySelector('.collapse-btn');
    
    content.classList.toggle('collapsed');
    
    if (content.classList.contains('collapsed')) {
        btn.textContent = '+';
    } else {
        btn.textContent = '−';
    }
}