diff --git a/src/views/base/home/composables/usePriceChart.ts b/src/views/base/home/composables/usePriceChart.ts
index 60dd1b9..03e62c5 100644
--- a/src/views/base/home/composables/usePriceChart.ts
+++ b/src/views/base/home/composables/usePriceChart.ts
@@ -1,15 +1,22 @@
 import { computed, ref, watch } from 'vue'
 import { getAllPrices } from '@/api/home'
-import type { Product } from '@/models/products'
 import { getProductsCatalog, getProductsCatalogRef } from '@/composables/useProductsCatalog'
-import { getProductBuyPrice, resolvePriceOffsetRatio } from '@/utils/productPrice'
-import { isKatodMesGroup, isMaftolMesGroup, isShamshMesGroup } from '@/utils/productDealMethod'
-import { getTradeBuyPrice, getTradeSellPrice, lastPrice } from '@/utils/price'
+import { getTradeBuyPrice, getTradeSellPrice } from '@/utils/price'
 
 export type ChartMetalType = 'katod' | 'maftol' | 'shamsh'
 
 type ChartPoint = [number, number]
 
+/**
+ * مارک‌آپ ثابت روی قیمت بورس کالا برای نمودار:
+ * کاتد +۳٪ ، مفتول +۶٪ ، شمش +۱۲٪
+ */
+export const CHART_METAL_MARKUP_RATIO: Record<ChartMetalType, number> = {
+  katod: 0.03,
+  maftol: 0.06,
+  shamsh: 0.12,
+}
+
 /** Module-level chart state — one dataset shared by mobile and desktop PriceChart instances. */
 const priceChartSeries = ref<{ name: string; data: ChartPoint[] }[]>([
   { name: 'قیمت', data: [] },
@@ -20,65 +27,18 @@ const chartLoading = ref(false)
 const selectedChartMetal = ref<ChartMetalType>('katod')
 const catalogProducts = getProductsCatalogRef()
 
-function resolveChartProducts(products: Product[]) {
-  return {
-    katod: findKatodProduct(products),
-    maftol: findMaftolProduct(products),
-    shamsh: findShamshProduct(products),
-  }
-}
+const maftolChartRatio = computed(() => CHART_METAL_MARKUP_RATIO.maftol)
+const shamshChartRatio = computed(() => CHART_METAL_MARKUP_RATIO.shamsh)
 
-/** نسبت مفتول به کاتد — reactive به قیمت لحظه‌ای و کاتالوگ محصولات */
-const maftolChartRatio = computed(() => {
-  void lastPrice.value?.price_last
-
-  const { katod, maftol } = resolveChartProducts(catalogProducts.value)
-  return deriveMetalChartRatio(maftol, katod)
-})
-
-/** نسبت شمش مس به کاتد */
-const shamshChartRatio = computed(() => {
-  void lastPrice.value?.price_last
-
-  const { katod, shamsh } = resolveChartProducts(catalogProducts.value)
-  return deriveMetalChartRatio(shamsh, katod)
-})
-
-const selectedMetalChartRatio = computed(() => {
-  if (selectedChartMetal.value === 'maftol') {
-    return maftolChartRatio.value
-  }
-  if (selectedChartMetal.value === 'shamsh') {
-    return shamshChartRatio.value
-  }
-  return 0
-})
+const selectedMetalChartRatio = computed(
+  () => CHART_METAL_MARKUP_RATIO[selectedChartMetal.value],
+)
 
 let chartFetchPromise: Promise<void> | null = null
 let chartInitialized = false
 let metalOffsetPromise: Promise<void> | null = null
 let metalOffsetLoaded = false
 
-function findKatodProduct(products: Product[]) {
-  return (
-    products.find((product) => isKatodMesGroup(product.group_type))
-    ?? products.find((product) => (product.title ?? '').includes('کاتد'))
-  )
-}
-
-function findMaftolProduct(products: Product[]) {
-  return (
-    products.find((product) => isMaftolMesGroup(product.group_type))
-    ?? products.find((product) => (product.title ?? '').includes('مفتول'))
-  )
-}
-
-function findShamshProduct(products: Product[]) {
-  return products.find((product) =>
-    isShamshMesGroup(product.group_type, product.title)
-  )
-}
-
 function applyChartRatio(basePrice: number, ratio: number) {
   if (!ratio) {
     return basePrice
@@ -87,7 +47,7 @@ function applyChartRatio(basePrice: number, ratio: number) {
   return Math.round(basePrice + basePrice * ratio)
 }
 
-/** بالاترین/پایین‌ترین امروز — برای boursecu با نسبت مفتول/شمش نسبت به کاتد */
+/** بالاترین/پایین‌ترین امروز — همان مارک‌آپ ثابت فلز روی قیمت بورس کالا */
 export function resolveMetalDayRangePrices(options: {
   price: { up?: { buy?: number; sell?: number }; buy?: number; sell?: number; price_last?: number } | null | undefined
   metal: ChartMetalType
@@ -95,44 +55,14 @@ export function resolveMetalDayRangePrices(options: {
 }) {
   const baseHigh = options.price?.up?.buy ?? getTradeBuyPrice(options.price as Parameters<typeof getTradeBuyPrice>[0])
   const baseLow = options.price?.up?.sell ?? getTradeSellPrice(options.price as Parameters<typeof getTradeSellPrice>[0])
-
-  if (options.metal === 'katod') {
-    return { high: baseHigh, low: baseLow }
-  }
+  const ratio = options.metalRatio || CHART_METAL_MARKUP_RATIO[options.metal]
 
   return {
-    high: applyChartRatio(baseHigh, options.metalRatio),
-    low: applyChartRatio(baseLow, options.metalRatio),
+    high: applyChartRatio(baseHigh, ratio),
+    low: applyChartRatio(baseLow, ratio),
   }
 }
 
-function deriveMetalChartRatio(metalProduct?: Product, katodProduct?: Product) {
-  const metalOffset = resolvePriceOffsetRatio(metalProduct?.price_offset_percent)
-  if (metalOffset) {
-    return metalOffset
-  }
-
-  if (!metalProduct) {
-    return 0
-  }
-
-  const liveBuy = getTradeBuyPrice(lastPrice.value)
-  const katodLive = katodProduct ? getProductBuyPrice(katodProduct) : liveBuy
-  const metalLive = getProductBuyPrice(metalProduct)
-
-  const katodStatic = Number(katodProduct?.price ?? 0) + Number(katodProduct?.price_profit ?? 0)
-  const metalStatic = Number(metalProduct.price ?? 0) + Number(metalProduct.price_profit ?? 0)
-
-  const referencePrice = katodLive || liveBuy || katodStatic
-  const derivedMetalPrice = metalLive || metalStatic
-
-  if (!referencePrice || !derivedMetalPrice || referencePrice === derivedMetalPrice) {
-    return 0
-  }
-
-  return (derivedMetalPrice - referencePrice) / referencePrice
-}
-
 function normalizeChartTimestamp(timestamp: number) {
   return timestamp < 1_000_000_000_000 ? timestamp * 1000 : timestamp
 }
@@ -165,15 +95,9 @@ function buildChartPoints(items: Array<{ timestamp: number; value: number }>): C
 
 function syncChartSeries() {
   const ratio = selectedMetalChartRatio.value
-  const data =
-    selectedChartMetal.value !== 'katod'
-      ? rawChartPoints.value.map(
-          ([timestamp, value]) =>
-            [timestamp, applyChartRatio(value, ratio)] as ChartPoint
-        )
-      : rawChartPoints.value
-
-  priceChartSeries.value[0].data = data
+  priceChartSeries.value[0].data = rawChartPoints.value.map(
+    ([timestamp, value]) => [timestamp, applyChartRatio(value, ratio)] as ChartPoint,
+  )
 }
 
 watch([selectedChartMetal, maftolChartRatio, shamshChartRatio], () => {
@@ -242,10 +166,7 @@ function updateChartData(timeline: string) {
 
 function setChartMetal(metal: ChartMetalType) {
   selectedChartMetal.value = metal
-
-  if (metal !== 'katod' && !catalogProducts.value.length) {
-    void loadMetalChartOffsets(true)
-  }
+  syncChartSeries()
 }
 
 export function usePriceChart() {