(function() {
  'use strict';

  // Check for reduced motion preference
  const prefersReducedMotion = window.matchMedia('(prefers-reduced-motion: reduce)').matches;

  // Navigation
  const nav = document.querySelector('.main-nav');
  const navToggle = document.querySelector('.nav-toggle');
  const navLinks = document.querySelector('.nav-links');

  // Scroll behavior for nav
  let lastScrollY = 0;
  let ticking = false;

  function updateNav() {
    const scrollY = window.scrollY;
    if (scrollY > 50) {
      nav.classList.add('scrolled');
    } else {
      nav.classList.remove('scrolled');
    }
    lastScrollY = scrollY;
    ticking = false;
  }

  window.addEventListener('scroll', () => {
    if (!ticking) {
      requestAnimationFrame(updateNav);
      ticking = true;
    }
  }, { passive: true });

  // Mobile nav toggle
  navToggle.addEventListener('click', () => {
    const isOpen = navToggle.getAttribute('aria-expanded') === 'true';
    navToggle.setAttribute('aria-expanded', !isOpen);
    navToggle.setAttribute('aria-label', isOpen ? 'פתח תפריט ניווט' : 'סגור תפריט ניווט');
    navLinks.classList.toggle('open');
    document.body.style.overflow = isOpen ? '' : 'hidden';
  });

  // Close mobile nav on link click
  navLinks.querySelectorAll('a').forEach(link => {
    link.addEventListener('click', () => {
      navToggle.setAttribute('aria-expanded', 'false');
      navToggle.setAttribute('aria-label', 'פתח תפריט ניווט');
      navLinks.classList.remove('open');
      document.body.style.overflow = '';
    });
  });

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

  // Reveal on scroll
  const revealElements = document.querySelectorAll('.reveal-text, .reveal-up');
  
  if (!prefersReducedMotion && revealElements.length > 0) {
    const revealObserver = new IntersectionObserver((entries) => {
      entries.forEach((entry) => {
        if (entry.isIntersecting) {
          entry.target.classList.add('visible');
          revealObserver.unobserve(entry.target);
        }
      });
    }, {
      threshold: 0.1,
      rootMargin: '0px 0px -40px 0px'
    });

    revealElements.forEach(el => revealObserver.observe(el));
  } else {
    // Show all elements immediately if reduced motion is preferred
    revealElements.forEach(el => {
      el.classList.add('visible');
    });
  }

  // Active section highlighting
  const sections = document.querySelectorAll('section[id]');
  const navItems = document.querySelectorAll('.nav-links a:not(.nav-cta)');

  if (sections.length > 0 && navItems.length > 0) {
    const sectionObserver = new IntersectionObserver((entries) => {
      entries.forEach(entry => {
        if (entry.isIntersecting) {
          const id = entry.target.getAttribute('id');
          navItems.forEach(item => {
            item.classList.remove('active');
            if (item.getAttribute('href') === `#${id}`) {
              item.classList.add('active');
            }
          });
        }
      });
    }, {
      threshold: 0.2,
      rootMargin: '-80px 0px -50% 0px'
    });

    sections.forEach(section => sectionObserver.observe(section));
  }

  // Form handling
  const form = document.querySelector('.contact-form');
  if (form) {
    form.addEventListener('submit', function(e) {
      e.preventDefault();
      
      const btn = form.querySelector('.submit-btn');
      const originalText = btn.querySelector('span').textContent;
      const requiredFields = form.querySelectorAll('[required]');
      let isValid = true;

      // Basic validation
      requiredFields.forEach(field => {
        if (!field.value.trim()) {
          isValid = false;
          field.style.borderColor = 'var(--color-accent)';
        } else {
          field.style.borderColor = '';
        }
      });

      if (!isValid) {
        return;
      }
      
      btn.querySelector('span').textContent = 'שולח...';
      btn.disabled = true;
      
      // Simulate submission (replace with actual form handling)
      setTimeout(() => {
        btn.querySelector('span').textContent = 'נשלח בהצלחה!';
        btn.style.background = '#2e7d32';
        
        setTimeout(() => {
          btn.querySelector('span').textContent = originalText;
          btn.style.background = '';
          btn.disabled = false;
          form.reset();
        }, 2500);
      }, 1200);
    });

    // Clear error styling on input
    form.querySelectorAll('input, textarea, select').forEach(field => {
      field.addEventListener('input', () => {
        field.style.borderColor = '';
      });
    });
  }

  // Keyboard navigation enhancement
  document.addEventListener('keydown', (e) => {
    if (e.key === 'Escape' && navLinks.classList.contains('open')) {
      navToggle.setAttribute('aria-expanded', 'false');
      navToggle.setAttribute('aria-label', 'פתח תפריט ניווט');
      navLinks.classList.remove('open');
      document.body.style.overflow = '';
      navToggle.focus();
    }
  });

  // Trap focus in mobile menu when open
  navLinks.addEventListener('keydown', (e) => {
    if (!navLinks.classList.contains('open')) return;
    
    const focusableElements = navLinks.querySelectorAll('a');
    const firstElement = focusableElements[0];
    const lastElement = focusableElements[focusableElements.length - 1];

    if (e.key === 'Tab') {
      if (e.shiftKey && document.activeElement === firstElement) {
        e.preventDefault();
        navToggle.focus();
      } else if (!e.shiftKey && document.activeElement === lastElement) {
        e.preventDefault();
        navToggle.focus();
      }
    }
  });

})();