function toggleRadio(radioId) {
const selected = document.getElementById(radioId);
selected.checked = true;

// Reset styles
document.querySelectorAll('.checkbox-container').forEach(container => {
container.style.borderColor = '#e1e8ed';
container.style.background = 'white';
});

// Highlight selected
const selectedContainer = selected.closest('.checkbox-container');
selectedContainer.style.borderColor = '#667eea';
selectedContainer.style.background = 'linear-gradient(135deg, #667eea10, #764ba210)';
}

function saveFormData() {
localStorage.setItem('billing_first_name', document.querySelector('input[name="billing_first_name"]').value);
localStorage.setItem('billing_last_name', document.querySelector('input[name="billing_last_name"]').value);
localStorage.setItem('billing_company', document.querySelector('input[name="billing_company"]').value);
localStorage.setItem('billing_whatsapp', document.querySelector('input[name="billing_whatsapp"]').value);
localStorage.setItem('billing_email', document.querySelector('input[name="billing_email"]').value);
localStorage.setItem('billing_slmc_number', document.querySelector('input[name="billing_slmc_number"]').value);
localStorage.setItem('billing_slmc_category', document.querySelector('input[name="billing_slmc_category"]').value);
localStorage.setItem('billing_address_1', document.querySelector('input[name="billing_address_1"]').value);
}

function getSelectedProducts() {
const selected = document.querySelector('input[name="product"]:checked');
return selected ? [selected.value] : [];
}

function validateForm() {
let errorMessage = "";
const emailPattern = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;

if (getSelectedProducts().length === 0) errorMessage += "Please select a registration type.\n";
if (!document.querySelector('input[name="billing_first_name"]').value) errorMessage += "Enter full name.\n";
if (!document.querySelector('input[name="billing_last_name"]').value) errorMessage += "Enter designation.\n";
if (!document.querySelector('input[name="billing_company"]').value) errorMessage += "Enter workplace.\n";
if (!document.querySelector('input[name="billing_whatsapp"]').value) errorMessage += "Enter WhatsApp number.\n";
if (!document.querySelector('input[name="billing_email"]').value.match(emailPattern)) errorMessage += "Enter valid email.\n";
if (!document.querySelector('input[name="billing_slmc_number"]').value) errorMessage += "Enter SLMC number.\n";
if (!document.querySelector('input[name="billing_slmc_category"]').value) errorMessage += "Enter SLMC registration category.\n";

if (errorMessage) {
alert(errorMessage);
return false;
}
return true;
}

function redirectToPayment() {
if (!validateForm()) return;

saveFormData();
const selectedProducts = getSelectedProducts();

let addedCount = 0;
selectedProducts.forEach(productId => {
jQuery.post('/?wc-ajax=add_to_cart', {
product_id: productId,
quantity: 1
}, function () {
addedCount++;
if (addedCount === selectedProducts.length) {
window.location.href = '/checkout/';
}
});
});
}