diff --git a/app/components/pos/CartTabs.vue b/app/components/pos/CartTabs.vue
index cc73b2d..5918db0 100644
--- a/app/components/pos/CartTabs.vue
+++ b/app/components/pos/CartTabs.vue
@@ -97,10 +97,7 @@ async function removeCart(cartId) {
 <style scoped>
 .tabs a {
   background-color: hsl(from var(--bulma-tabs-boxed-link-hover-background-color) h s calc(l + 1));
-  --bulma-tabs-link-padding: 0.4em 1em 0.4em 0.5em;
-  &.new {
-    --bulma-tabs-link-padding: 0.4em 0.5em 0.4em 0.5em;
-  }
+  --bulma-tabs-link-padding: 0.4em 0.5em 0.4em 0.5em;
 }
 
 .tabs a:hover {
@@ -117,13 +114,13 @@ async function removeCart(cartId) {
 
 .close {
   display: none;
-  background-color: var(--bulma-white-ter);
+  background-color: transparent;
   cursor: pointer;
 }
 li:hover .close {
   display: flex;
 }
 .close:hover {
-  background-color: var(--bulma-grey-lighter);
+  background-color: hsl(0, 0%, 0%, 0.1);
 }
 </style>
diff --git a/app/components/pos/POS.vue b/app/components/pos/POS.vue
index 3c22524..cf70dd0 100644
--- a/app/components/pos/POS.vue
+++ b/app/components/pos/POS.vue
@@ -1,49 +1,38 @@
 <script setup>
-import { without } from "es-toolkit";
 import Address from "~/components/pos/Address.vue";
 import CartItem from "~/components/pos/CartItem.vue";
 import CartTabs from "~/components/pos/CartTabs.vue";
+import useActiveCart from "~/components/pos/composables/useActiveCart";
+import useCartData from "~/components/pos/composables/useCartData";
+import useCustomer from "~/components/pos/composables/useCustomer";
+import useOrderInfo from "~/components/pos/composables/useOrderInfo";
 import SearchBox from "~/components/SearchBox.vue";
 
 const store = useStore();
-const { $findapi, $getapi, $getdata, $patchapi, $numtoString } = useNuxtApp();
-const carts = ref([]);
-const cartItems = ref([]);
-const customers = ref([]);
-const activeCartId = ref();
-const activeCart = computed(() => carts.value.find((c) => c.id === activeCartId.value));
-const activeCartItems = computed(() => cartItems.value.filter((ci) => ci.cart === activeCartId.value));
-const isUpdating = ref(false);
+const { $numtoString } = useNuxtApp();
 
-async function getCarts() {
-  const apis = $findapi(["Cart", "Cart_Item", "customer"]);
-  const [cartsRes, cartItemsRes, customersRes] = await $getapi(apis);
+const { carts, cartItems, customers, getCarts, isPending } = useCartData();
 
-  carts.value = cartsRes.data.rows || [];
-  cartItems.value = cartItemsRes.data.rows || [];
-  customers.value = customersRes.data.rows || [];
-}
-
-const customerIdsWithNoCart = computed(() => {
-  const cusIds = customers.value.map((c) => c.id);
-  const cusIdsWithCart = carts.value.filter((c) => c.customer).map((c) => c.customer);
-  const cusIdsWithNoCart = without(cusIds, ...cusIdsWithCart);
-  return cusIdsWithNoCart;
+const { activeCartId, activeCart, activeCartItems, customerIdsWithNoCart, subtotal } = useActiveCart({
+  carts,
+  cartItems,
+  customers,
 });
 
-onMounted(async () => {
-  await getCarts();
-  activeCartId.value = carts.value[0].id;
+const { addresses, getAddresses, isChangingCus, changeCustomer } = useCustomer({ activeCart, getCarts });
+
+const { orderInfo, isOrderValid } = useOrderInfo({
+  activeCartId,
+  activeCart,
+  activeCartItems,
+  addresses,
+  getAddresses,
 });
 
-watch(activeCartId, () => {
-  orderInfo.value.deliveryMethod = null;
-  orderInfo.value.paymentMethod = null;
-});
+const showModal = ref();
 
-const showProductSelectionModal = ref();
 function openProductSelectionModal() {
-  showProductSelectionModal.value = {
+  showModal.value = {
     component: "pos/ProductSelection",
     title: "Chọn sản phẩm",
     width: "85%",
@@ -51,70 +40,8 @@ function openProductSelectionModal() {
   };
 }
 
-const orderInfo = ref({
-  address: null,
-  deliveryMethod: null,
-  paymentMethod: null,
-});
-const addresses = ref([]);
-const subtotal = computed(() => {
-  return activeCartItems.value?.reduce((prev, curr) => prev + curr.imei__variant__price, 0);
-});
-
-async function getAddresses() {
-  addresses.value = await $getdata("Customer_Address", {
-    filter: { customer: activeCart.value.customer },
-  });
-}
-
-watch(activeCart, async (newVal, oldVal) => {
-  // set order info
-  if (newVal.customer) {
-    await getAddresses();
-    if (!oldVal || !oldVal.customer || oldVal.customer !== newVal.customer) {
-      const defaultAddress = addresses.value.find((add) => add.is_default);
-      orderInfo.value.address = defaultAddress;
-    }
-  } else {
-    addresses.value = null;
-    orderInfo.value.address = null;
-  }
-});
-
-const isChangingCus = ref(false);
-async function changeCustomer(cusId) {
-  isChangingCus.value = true;
-  const updatedCart = await $patchapi("Cart", {
-    id: activeCartId.value,
-    customer: cusId,
-  });
-  await getCarts();
-  isChangingCus.value = false;
-}
-
-watch(
-  () => orderInfo.value.deliveryMethod,
-  (newVal) => {
-    if (newVal?.code === "HOME_DELIVERY") {
-      const defaultAddress = addresses.value.find((add) => add.is_default);
-      orderInfo.value.address = defaultAddress;
-    }
-  },
-);
-
-const isOrderValid = computed(() => {
-  if (activeCartItems.value?.length === 0) return false;
-  if (!activeCart.value?.customer) return false;
-  if (!orderInfo.value.deliveryMethod) return false;
-  if (!orderInfo.value.paymentMethod) return false;
-  if (orderInfo.value.deliveryMethod.code === "HOME_DELIVERY" && !orderInfo.value.address) return false;
-
-  return true;
-});
-
-const showConfirmModal = ref();
 function openConfirmModal() {
-  showConfirmModal.value = {
+  showModal.value = {
     component: "pos/ConfirmOrder",
     title: "Xác nhận đơn hàng",
     width: "60%",
@@ -163,7 +90,7 @@ provide("pos", {
                   </span>
                   <span>Giỏ hàng</span>
                   <span
-                    v-if="isUpdating"
+                    v-if="isPending"
                     class="icon"
                   >
                     <Icon
@@ -385,14 +312,9 @@ provide("pos", {
       </div>
     </div>
     <Modal
-      v-if="showProductSelectionModal"
-      v-bind="showProductSelectionModal"
-      @close="showProductSelectionModal = undefined"
-    />
-    <Modal
-      v-if="showConfirmModal"
-      v-bind="showConfirmModal"
-      @close="showConfirmModal = undefined"
+      v-if="showModal"
+      v-bind="showModal"
+      @close="showModal = undefined"
     />
   </div>
 </template>
diff --git a/app/components/pos/composables/useActiveCart.js b/app/components/pos/composables/useActiveCart.js
new file mode 100644
index 0000000..f58a0ae
--- /dev/null
+++ b/app/components/pos/composables/useActiveCart.js
@@ -0,0 +1,31 @@
+import { without } from "es-toolkit";
+
+export default function useActiveCart({ carts, cartItems, customers }) {
+  const activeCartId = ref();
+
+  const activeCart = computed(() => carts.value.find((c) => c.id === activeCartId.value));
+  const activeCartItems = computed(() => cartItems.value.filter((ci) => ci.cart === activeCartId.value));
+
+  watch(
+    carts,
+    (newVal) => {
+      if (!activeCartId.value && newVal.length) {
+        activeCartId.value = newVal[0].id;
+      }
+    },
+    { immediate: true },
+  );
+
+  const customerIdsWithNoCart = computed(() => {
+    const cusIds = customers.value.map((c) => c.id);
+    const cusIdsWithCart = carts.value.filter((c) => c.customer).map((c) => c.customer);
+    const cusIdsWithNoCart = without(cusIds, ...cusIdsWithCart);
+    return cusIdsWithNoCart;
+  });
+
+  const subtotal = computed(() => {
+    return activeCartItems.value?.reduce((prev, curr) => prev + curr.imei__variant__price, 0);
+  });
+
+  return { activeCartId, activeCart, activeCartItems, customerIdsWithNoCart, subtotal };
+}
diff --git a/app/components/pos/composables/useCartData.js b/app/components/pos/composables/useCartData.js
new file mode 100644
index 0000000..db78694
--- /dev/null
+++ b/app/components/pos/composables/useCartData.js
@@ -0,0 +1,22 @@
+export default function useCartData() {
+  const { $findapi, $getapi } = useNuxtApp();
+  const carts = ref([]);
+  const cartItems = ref([]);
+  const customers = ref([]);
+  const isPending = ref(false);
+
+  async function getCarts() {
+    isPending.value = true;
+    const apis = $findapi(["Cart", "Cart_Item", "customer"]);
+    const [cartsRes, cartItemsRes, customersRes] = await $getapi(apis);
+    isPending.value = false;
+
+    carts.value = cartsRes.data.rows || [];
+    cartItems.value = cartItemsRes.data.rows || [];
+    customers.value = customersRes.data.rows || [];
+  }
+
+  onMounted(getCarts);
+
+  return { carts, cartItems, customers, getCarts, isPending };
+}
diff --git a/app/components/pos/composables/useCustomer.js b/app/components/pos/composables/useCustomer.js
new file mode 100644
index 0000000..8f426e0
--- /dev/null
+++ b/app/components/pos/composables/useCustomer.js
@@ -0,0 +1,23 @@
+export default function useCustomer({ activeCart, getCarts }) {
+  const { $getdata, $patchapi } = useNuxtApp();
+
+  const addresses = ref([]);
+  async function getAddresses() {
+    addresses.value = await $getdata("Customer_Address", {
+      filter: { customer: activeCart.value.customer },
+    });
+  }
+
+  const isChangingCus = ref(false);
+  async function changeCustomer(cusId) {
+    isChangingCus.value = true;
+    const updatedCart = await $patchapi("Cart", {
+      id: activeCart.value.id,
+      customer: cusId,
+    });
+    await getCarts();
+    isChangingCus.value = false;
+  }
+
+  return { addresses, getAddresses, isChangingCus, changeCustomer };
+}
diff --git a/app/components/pos/composables/useOrderInfo.js b/app/components/pos/composables/useOrderInfo.js
new file mode 100644
index 0000000..0170c36
--- /dev/null
+++ b/app/components/pos/composables/useOrderInfo.js
@@ -0,0 +1,49 @@
+export default function useOrderInfo({ activeCartId, activeCart, activeCartItems, addresses, getAddresses }) {
+  const orderInfo = ref({
+    address: null,
+    deliveryMethod: null,
+    paymentMethod: null,
+  });
+
+  watch(activeCartId, () => {
+    // reset fields when tab is switched
+    orderInfo.value.deliveryMethod = null;
+    orderInfo.value.paymentMethod = null;
+  });
+
+  watch(activeCart, async (newVal, oldVal) => {
+    // set order info
+    if (newVal?.customer) {
+      await getAddresses();
+      if (!oldVal || !oldVal.customer || oldVal.customer !== newVal.customer) {
+        const defaultAddress = addresses.value.find((add) => add.is_default);
+        orderInfo.value.address = defaultAddress;
+      }
+    } else {
+      addresses.value = null;
+      orderInfo.value.address = null;
+    }
+  });
+
+  watch(
+    () => orderInfo.value.deliveryMethod,
+    (newVal) => {
+      if (newVal?.code === "HOME_DELIVERY") {
+        const defaultAddress = addresses.value.find((add) => add.is_default);
+        orderInfo.value.address = defaultAddress;
+      }
+    },
+  );
+
+  const isOrderValid = computed(() => {
+    if (activeCartItems.value?.length === 0) return false;
+    if (!activeCart.value?.customer) return false;
+    if (!orderInfo.value.deliveryMethod) return false;
+    if (!orderInfo.value.paymentMethod) return false;
+    if (orderInfo.value.deliveryMethod.code === "HOME_DELIVERY" && !orderInfo.value.address) return false;
+
+    return true;
+  });
+
+  return { orderInfo, isOrderValid };
+}