// Shared header navigation for all pages
(function(){
  const links = [
    { href: '/', label: 'Accueil' },
    { href: '/events', label: 'Événements' },
    { href: '/admin', label: 'Admin' },
    { href: '/scoreboard', label: 'Classement' },
  ];

  const path = location.pathname.replace(/\/index\.html$/, '');
  const isActive = (href) => {
    if (href === '/') return path === '/' || path === '';
    return path.startsWith(href);
  };

  const nav = document.createElement('nav');
  nav.className = 'site-nav';
  nav.innerHTML = links.map(l => 
    `<a href="${l.href}" class="${isActive(l.href) ? 'active' : ''}">${l.label}</a>`
  ).join('');

  let header = document.querySelector('header');
  if (!header) {
    header = document.createElement('header');
    document.body.prepend(header);
  }
  // Basic style if not present (non-intrusive)
  header.style.position = header.style.position || 'sticky';
  header.style.top = header.style.top || '0';
  header.style.zIndex = header.style.zIndex || '4';

  // Title (keep existing title if present)
  let h1 = header.querySelector('h1');
  if (!h1) {
    h1 = document.createElement('h1');
    h1.textContent = 'Super Sunday';
    header.prepend(h1);
  }
  // Replace or add nav
  const oldNav = header.querySelector('nav');
  if (oldNav) oldNav.replaceWith(nav); else header.appendChild(nav);
})();