async function executeAuthAction(type) {
  const emailInput = type === 'login' ? get('loginEmail') : get('regEmail');
  const passInput = type === 'login' ? get('loginPass') : get('regPass');
  
  const email = emailInput.value.trim();
  const password = passInput.value.trim();

  if (!email || !password) { 
    triggerToast("Validation Alert", "All credential inputs are mandatory."); 
    return; 
  }

  try {
    triggerToast("Processing", "Establishing connection to database validation layers...");
    
    // Using relative path formatting ensures your requests hit your Pages Functions seamlessly
    const response = await fetch('/api/auth', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ action: type, email, password })
    });

    if (response.ok) {
      const serverData = await response.json();
      appState.user = email;
      
      // Pull down actual user profiles from KV storage metrics cleanly
      appState.xp = serverData.xp || 0;
      appState.completedLessons = serverData.completedLessons || [];
      appState.streak = serverData.streak || 1;
      
      get('authContainer').style.display = 'none';
      get('userProfileBadge').textContent = email;
      
      initializeWorkspaceCurriculumTree();
      triggerToast("Access Granted", "Cloud synchronization connection active and stable.");
    } else {
      const errorText = await response.text();
      triggerToast("Authentication Refused", errorText || "Invalid credentials provided.");
    }
  } catch (err) {
    triggerToast("Network Disconnection", "Fatal processing link drop. Verify server context bindings.");
  }
}