document.addEventListener('DOMContentLoaded', () => {
    const form = document.getElementById('signup');
    if (!form) return;

    const keys = ['utm_source','utm_medium','utm_campaign','utm_term','utm_content'];
    keys.forEach(key => {
      const value = localStorage.getItem(key);
      if (value) {
        const input = form.querySelector(`input[name="${key}"]`);
        if (input) {
          input.value = value;
          console.log(`Set ${key} = ${value}`);
        }
      }
    });
  });