// Theme toggle functionality
const themeToggle = document.getElementById('themeToggle');
const body = document.body;

// Check for saved theme preference or default to system preference
const savedTheme = localStorage.getItem('theme');
const systemPrefersDark = window.matchMedia('(prefers-color-scheme: dark)').matches;

if (savedTheme) {
  body.setAttribute('data-theme', savedTheme);
} else if (!systemPrefersDark) {
  body.setAttribute('data-theme', 'light');
}

themeToggle.addEventListener('click', () => {
  const currentTheme = body.getAttribute('data-theme');
  const newTheme = currentTheme === 'light' ? 'dark' : 'light';
  
  body.setAttribute('data-theme', newTheme);
  localStorage.setItem('theme', newTheme);
});

// Mobile menu toggle
const menuToggle = document.getElementById('menuToggle');
const mobileMenu = document.getElementById('mobileMenu');

if (menuToggle && mobileMenu) {
  menuToggle.addEventListener('click', () => {
    mobileMenu.classList.toggle('active');
  });
}

// 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'
      });
      // Close mobile menu after clicking a link
      if (mobileMenu) {
        mobileMenu.classList.remove('active');
      }
    }
  });
});

// Update active navigation link on scroll
window.addEventListener('scroll', () => {
  const sections = document.querySelectorAll('section[id]');
  const navLinks = document.querySelectorAll('.nav-links a');
  
  let current = '';
  sections.forEach(section => {
    const sectionTop = section.offsetTop - 100;
    if (window.pageYOffset >= sectionTop) {
      current = section.getAttribute('id');
    }
  });

  navLinks.forEach(link => {
    link.classList.remove('active');
    if (link.getAttribute('href') === `#${current}`) {
      link.classList.add('active');
    }
  });
});