document.addEventListener("DOMContentLoaded", function() {
  const observer = new MutationObserver(() => {
    const purchaseBtn = document.querySelector('button[data-test="add-to-cart"]');
    if (purchaseBtn && !document.querySelector(".custom-add-to-cart")) {
      const addBtn = document.createElement("button");
      addBtn.textContent = "ADD TO CART";
      addBtn.className = "custom-add-to-cart";
      addBtn.style.cssText = "background:#b43b2a;color:#fff;border:none;padding:12px 25px;font-weight:600;border-radius:30px;cursor:pointer;margin-top:15px;display:block;width:100%;";
      addBtn.onclick = () => {
        const form = purchaseBtn.closest('form');
        if (form) form.submit();
        else purchaseBtn.click();
      };
      purchaseBtn.parentNode.insertBefore(addBtn, purchaseBtn.nextSibling);
    }
  });
  observer.observe(document.body, { childList: true, subtree: true });
});