diff --git a/src/views/my-aws-dashboards/README.md b/src/views/my-aws-dashboards/README.md
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+# My AWS Dashboards
+
+> A browser-based AWS cost and billing monitor with interactive charts, service breakdowns, and exportable reports — built as part of [vibe.j2team.org](https://vibe.j2team.org).
+
+![My AWS Dashboards](https://vibe.j2team.org/my-aws-dashboard)
+
+## Overview
+
+**My AWS Dashboards** is a self-contained, client-side tool for visualizing AWS account costs and billing data. It ships with a full-featured demo mode using realistic simulated data so you can explore the dashboard immediately — no AWS account required.
+
+When connected to a real AWS account, the app authenticates through **Amazon Cognito Identity Pools**, which issues short-lived STS credentials. No long-lived IAM access keys are ever entered or stored.
+
+> [!IMPORTANT]
+> AWS Cost Explorer does not support CORS for direct browser requests. When connected via Cognito, the app will attempt a live connection and gracefully fall back to demo mode if CORS blocks the request. See [Real AWS Data](#real-aws-data) for workarounds.
+
+## Features
+
+- **Cost Explorer Dashboard** — visualize spending across all AWS services in a selected date range
+- **4 Chart Types** — grouped bar, stacked bar, line chart, and donut chart
+- **Date Range Filter** — pick any custom date range with daily or monthly granularity
+- **Service Filter** — show or hide individual AWS services from the chart
+- **Summary Cards** — total cost, top service, average per period, cost trend vs. previous period
+- **Sortable Breakdown Table** — sort services by name, cost, or percentage share
+- **Export Reports** — download the current dashboard data as **CSV** or **XLSX**
+- **Demo Mode** — instantly explore with 6 months of realistic simulated AWS data
+- **Cognito Authentication** — zero long-lived keys; temporary STS credentials only
+- **5-Minute Auto-Logout** — session expires automatically; countdown shown in the header
+
+## Authentication
+
+### Security Model
+
+The app follows AWS best practices for browser-based credential management:
+
+| Old approach (removed) | New approach |
+|---|---|
+| Long-lived IAM Access Key + Secret stored in `localStorage` | Temporary STS credentials from Cognito — **in memory only** |
+| Credentials persist indefinitely across sessions | Session expires after **5 minutes**, then auto-logout |
+| Secret key visible in browser storage | No secrets ever touch storage |
+
+### How It Works
+
+1. User provides their **Cognito Identity Pool ID** (a non-secret public identifier).
+2. The app calls the **Cognito Identity API** (`GetId` → `GetCredentialsForIdentity`) to obtain temporary STS credentials.
+3. Credentials are held **in memory only** — never written to `localStorage`, `sessionStorage`, or any cache.
+4. A **5-minute countdown timer** is displayed in the header. When it reaches zero the session is cleared and the user is logged out automatically.
+5. On the next visit (or page refresh), the Identity Pool ID is pre-filled; one click reconnects and issues fresh credentials.
+
+### Setting Up a Cognito Identity Pool
+
+1. Open **AWS Console → Cognito → Identity Pools** and click *Create identity pool*.
+2. Enable **Guest access (unauthenticated identities)**.
+3. On the IAM role step, attach a role with the minimum policy:
+
+```json
+{
+  "Version": "2012-10-17",
+  "Statement": [
+    {
+      "Effect": "Allow",
+      "Action": ["ce:GetCostAndUsage"],
+      "Resource": "*"
+    }
+  ]
+}
+```
+
+4. Copy the **Identity Pool ID** (format: `us-east-1:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx`).
+5. Paste it into the app and click **Connect via Cognito**.
+
+> [!TIP]
+> The Identity Pool ID is a public identifier — it is safe to save in localStorage (which the app does for reconnect UX). Only the temporary STS credentials are sensitive, and those are never persisted.
+
+## Architecture
+
+```
+src/views/my-aws-dashboard/
+├── index.vue                        # Page entry — orchestrates auth vs. dashboard state
+├── meta.ts                          # Page metadata for the launcher
+├── types.ts                         # Shared TypeScript interfaces (CognitoConfig, CognitoSession, …)
+├── components/
+│   ├── AwsAuth.vue                  # Cognito Identity Pool credential form
+│   └── CostDashboard.vue            # Full dashboard with charts, table, and export
+├── composables/
+│   ├── useCognitoAuth.ts            # Cognito auth flow, session timer, and auto-logout
+│   └── useAwsCost.ts                # Data fetching — real or demo fallback
+└── utils/
+    ├── cognitoClient.ts             # Cognito GetId + GetCredentialsForIdentity API calls
+    ├── demoData.ts                  # Deterministic demo cost data generator
+    ├── chartUtils.ts                # Chart.js config builders for each chart type
+    ├── exportUtils.ts               # CSV and XLSX export logic
+    └── sigv4.ts                     # AWS Signature Version 4 signing (Web Crypto API)
+```
+
+## Getting Started
+
+This app is part of the vibe.j2team.org project. To run it locally:
+
+```sh
+pnpm install
+pnpm dev
+```
+
+Visit `http://localhost:5173/my-aws-dashboard`.
+
+### Demo Mode
+
+On first visit the Cognito auth form is shown. Click **Try with Demo Data** to instantly load simulated data — no configuration needed. You can also click the **Demo** button in the page header at any time.
+
+### Real AWS Data
+
+To connect to your AWS account:
+
+1. [Set up a Cognito Identity Pool](#setting-up-a-cognito-identity-pool) as described above.
+2. Click **Connect AWS** in the page header (or use the auth form on first visit).
+3. Enter the **Identity Pool ID** and **Region**, then click **Connect via Cognito**.
+
+> [!WARNING]
+> Due to CORS restrictions on the AWS Cost Explorer API endpoint (`ce.us-east-1.amazonaws.com`), direct browser requests are blocked. The app will show an error and revert to demo data.
+
+**Workarounds for real data:**
+
+- Use a browser extension that disables CORS (development only)
+- Set up a local CORS proxy and point requests through it
+- Run the equivalent AWS CLI command and paste the output:
+
+```sh
+aws ce get-cost-and-usage \
+  --time-period Start=2025-11-01,End=2026-04-30 \
+  --granularity MONTHLY \
+  --group-by Type=DIMENSION,Key=SERVICE \
+  --metrics BlendedCost
+```
+
+## Security
+
+- **No long-lived keys** — the app never asks for or stores IAM Access Keys or Secret Access Keys.
+- **In-memory credentials only** — STS credentials from Cognito are held in a Vue reactive ref; they disappear on page refresh or tab close.
+- **5-minute session timeout** — auto-logout is enforced client-side via `setTimeout`; a countdown is visible in the header.
+- **Public config only in storage** — `localStorage` holds only the non-secret Identity Pool ID for reconnect UX.
+- **No third-party data transmission** — all API calls go directly to `*.amazonaws.com` and `cognito-identity.*.amazonaws.com`.
+- **Static deployment** — the app runs as a static site on Cloudflare Workers with no backend.
+
+## Tech Stack
+
+| Library | Purpose |
+|---------|---------|
+| Vue 3 + TypeScript | UI framework |
+| VueUse `useLocalStorage` | Non-secret config persistence (Identity Pool ID only) |
+| VueUse `useScriptTag` | Lazy-load Chart.js and SheetJS from CDN |
+| Amazon Cognito Identity | Federated identity and temporary STS credential issuance |
+| [Chart.js 4](https://www.chartjs.org/) | Interactive charts (loaded from CDN) |
+| [SheetJS (xlsx)](https://sheetjs.com/) | XLSX export (loaded from CDN on demand) |
+| Tailwind CSS v4 | Styling via project design system |
+
+## Author
+
+Built by **J2TEAM** as part of [vibe.j2team.org](https://vibe.j2team.org).
diff --git a/src/views/my-aws-dashboards/components/AwsAuth.vue b/src/views/my-aws-dashboards/components/AwsAuth.vue
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--- /dev/null
+++ b/src/views/my-aws-dashboards/components/AwsAuth.vue
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+<script setup lang="ts">
+import { ref, reactive } from 'vue'
+import { Icon } from '@iconify/vue'
+import type { CognitoConfig } from '../types'
+import { AWS_REGIONS } from '../utils/demoData'
+
+const props = defineProps<{
+  /** Pre-filled when user has a saved config (reconnect flow) */
+  savedConfig?: CognitoConfig | null
+  isLoading?: boolean
+  errorMessage?: string
+}>()
+
+const emit = defineEmits<{
+  connect: [config: CognitoConfig]
+  demo: []
+}>()
+
+const IDENTITY_POOL_PATTERN =
+  /^[a-z]{2,}-[a-z]+-\d:[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i
+const ROLE_ARN_PATTERN = /^arn:aws:iam::\d{12}:role\/.+$/
+
+const form = reactive<CognitoConfig>({
+  identityPoolId: props.savedConfig?.identityPoolId ?? '',
+  region: props.savedConfig?.region ?? 'ap-southeast-1',
+  roleArn: props.savedConfig?.roleArn ?? '',
+})
+
+const errors = reactive({ identityPoolId: '', roleArn: '' })
+
+function validateIdentityPoolId(value: string): string {
+  if (!value.trim()) return 'Identity Pool ID is required'
+  if (!IDENTITY_POOL_PATTERN.test(value.trim()))
+    return 'Must be in the format: ap-southeast-1:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx'
+  return ''
+}
+
+function validateRoleArn(value: string): string {
+  if (!value.trim()) return 'Unauthenticated Role ARN is required'
+  if (!ROLE_ARN_PATTERN.test(value.trim()))
+    return 'Must be in the format: arn:aws:iam::123456789012:role/RoleName'
+  return ''
+}
+
+function handleSubmit(): void {
+  errors.identityPoolId = validateIdentityPoolId(form.identityPoolId)
+  errors.roleArn = validateRoleArn(form.roleArn)
+  if (errors.identityPoolId || errors.roleArn) return
+  emit('connect', {
+    identityPoolId: form.identityPoolId.trim(),
+    region: form.region,
+    roleArn: form.roleArn.trim(),
+  })
+}
+
+function handleDemo(): void {
+  emit('demo')
+}
+
+const showSetupGuide = ref(false)
+</script>
+
+<template>
+  <div class="flex min-h-[60vh] items-center justify-center px-4 py-12">
+    <div class="w-full max-w-lg animate-fade-up">
+      <!-- Header -->
+      <div class="mb-8 text-center">
+        <div class="mb-4 flex justify-center">
+          <div
+            class="flex size-16 items-center justify-center border border-accent-coral bg-bg-surface"
+          >
+            <Icon icon="lucide:shield-check" class="size-8 text-accent-coral" />
+          </div>
+        </div>
+        <h1 class="font-display text-2xl font-bold text-text-primary">
+          Connect via <span class="text-accent-amber">AWS Cognito</span>
+        </h1>
+        <p class="mt-2 text-sm text-text-secondary">
+          Uses temporary credentials from a Cognito Identity Pool — no long-lived keys required.
+        </p>
+      </div>
+
+      <!-- Auth error from parent -->
+      <div v-if="errorMessage" class="mb-4 flex gap-2.5 border border-red-500/40 bg-red-500/5 p-3">
+        <Icon icon="lucide:alert-circle" class="mt-0.5 size-4 shrink-0 text-red-400" />
+        <p class="text-xs leading-relaxed text-red-300">{{ errorMessage }}</p>
+      </div>
+
+      <!-- Auth Form -->
+      <div class="border border-border-default bg-bg-surface p-6">
+        <form @submit.prevent="handleSubmit">
+          <!-- Identity Pool ID -->
+          <div class="mb-4">
+            <label
+              for="identityPoolId"
+              class="mb-1.5 flex items-center gap-1.5 font-display text-xs tracking-wide text-text-secondary"
+            >
+              <Icon icon="lucide:fingerprint" class="size-3.5" />
+              IDENTITY POOL ID
+              <span class="text-accent-coral">*</span>
+            </label>
+            <input
+              id="identityPoolId"
+              v-model="form.identityPoolId"
+              type="text"
+              autocomplete="off"
+              spellcheck="false"
+              placeholder="us-east-1:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+              class="w-full border border-border-default bg-bg-deep px-3 py-2.5 font-mono text-sm text-text-primary placeholder:text-text-dim focus:border-accent-coral focus:outline-none"
+              :class="{ 'border-red-500': errors.identityPoolId }"
+              @blur="errors.identityPoolId = validateIdentityPoolId(form.identityPoolId)"
+            />
+            <p v-if="errors.identityPoolId" class="mt-1 text-xs text-red-400">
+              {{ errors.identityPoolId }}
+            </p>
+            <p class="mt-1 text-xs text-text-dim">
+              Found in AWS Console → Cognito → Identity Pools → your pool → Identity pool ID
+            </p>
+          </div>
+
+          <!-- Unauthenticated Role ARN -->
+          <div class="mb-4">
+            <label
+              for="roleArn"
+              class="mb-1.5 flex items-center gap-1.5 font-display text-xs tracking-wide text-text-secondary"
+            >
+              <Icon icon="lucide:shield" class="size-3.5" />
+              UNAUTHENTICATED ROLE ARN
+              <span class="text-accent-coral">*</span>
+            </label>
+            <input
+              id="roleArn"
+              v-model="form.roleArn"
+              type="text"
+              autocomplete="off"
+              spellcheck="false"
+              placeholder="arn:aws:iam::123456789012:role/MyAwsDashboardUnauthRole"
+              class="w-full border border-border-default bg-bg-deep px-3 py-2.5 font-mono text-sm text-text-primary placeholder:text-text-dim focus:border-accent-coral focus:outline-none"
+              :class="{ 'border-red-500': errors.roleArn }"
+              @blur="errors.roleArn = validateRoleArn(form.roleArn)"
+            />
+            <p v-if="errors.roleArn" class="mt-1 text-xs text-red-400">
+              {{ errors.roleArn }}
+            </p>
+            <p class="mt-1 text-xs text-text-dim">
+              ARN of the IAM role attached to the Identity Pool's unauthenticated access
+            </p>
+          </div>
+
+          <!-- Region -->
+          <div class="mb-6">
+            <label
+              for="region"
+              class="mb-1.5 flex items-center gap-1.5 font-display text-xs tracking-wide text-text-secondary"
+            >
+              <Icon icon="lucide:globe" class="size-3.5" />
+              REGION
+            </label>
+            <select
+              id="region"
+              v-model="form.region"
+              class="w-full border border-border-default bg-bg-deep px-3 py-2.5 text-sm text-text-primary focus:border-accent-coral focus:outline-none"
+            >
+              <option v-for="r in AWS_REGIONS" :key="r.value" :value="r.value">
+                {{ r.label }}
+              </option>
+            </select>
+          </div>
+
+          <!-- Security note -->
+          <div class="mb-5 flex gap-2.5 border border-accent-sky/30 bg-accent-sky/5 p-3">
+            <Icon icon="lucide:shield" class="mt-0.5 size-4 shrink-0 text-accent-sky" />
+            <div class="text-xs leading-relaxed text-text-secondary">
+              <p>
+                <strong class="text-accent-sky">Secure by design:</strong> No access keys are
+                entered or stored. Cognito issues short-lived STS credentials kept in memory only.
+                Session auto-expires in <strong class="text-accent-sky">5 minutes</strong>.
+              </p>
+            </div>
+          </div>
+
+          <!-- Actions -->
+          <button
+            type="submit"
+            :disabled="isLoading"
+            class="flex w-full items-center justify-center gap-2 bg-accent-coral px-4 py-3 font-display text-sm font-semibold text-bg-deep transition-opacity hover:opacity-90 disabled:cursor-not-allowed disabled:opacity-60"
+          >
+            <Icon
+              :icon="isLoading ? 'lucide:loader-circle' : 'lucide:plug'"
+              class="size-4"
+              :class="{ 'animate-spin': isLoading }"
+            />
+            {{ isLoading ? 'Connecting…' : 'Connect via Cognito' }}
+          </button>
+        </form>
+
+        <div class="mt-3 flex items-center gap-3">
+          <div class="h-px flex-1 bg-border-default" />
+          <span class="text-xs text-text-dim">or</span>
+          <div class="h-px flex-1 bg-border-default" />
+        </div>
+
+        <button
+          type="button"
+          class="mt-3 flex w-full items-center justify-center gap-2 border border-border-default bg-bg-elevated px-4 py-3 font-display text-sm text-text-secondary transition-colors hover:border-accent-sky hover:text-accent-sky"
+          @click="handleDemo"
+        >
+          <Icon icon="lucide:layout-dashboard" class="size-4" />
+          Try with Demo Data
+        </button>
+      </div>
+
+      <!-- Setup guide toggle -->
+      <div class="mt-4">
+        <button
+          type="button"
+          class="flex w-full items-center justify-between text-xs text-text-dim hover:text-text-secondary"
+          @click="showSetupGuide = !showSetupGuide"
+        >
+          <span class="flex items-center gap-1.5">
+            <Icon icon="lucide:book-open" class="size-3.5" />
+            How to set up a Cognito Identity Pool
+          </span>
+          <Icon
+            icon="lucide:chevron-down"
+            class="size-3.5 transition-transform duration-200"
+            :class="{ 'rotate-180': showSetupGuide }"
+          />
+        </button>
+
+        <div
+          v-if="showSetupGuide"
+          class="mt-3 space-y-2 border border-border-default bg-bg-surface p-4 text-xs text-text-secondary"
+        >
+          <p class="font-semibold text-text-primary">Quick setup (5 steps):</p>
+          <ol class="list-decimal space-y-1.5 pl-4">
+            <li>
+              Open <strong>AWS Console → Cognito → Identity Pools</strong> and click
+              <em>Create identity pool</em>.
+            </li>
+            <li>Enable <strong>Guest access (unauthenticated identities)</strong>.</li>
+            <li>
+              On the IAM role step, create (or attach) a role with only:
+              <code class="ml-1 bg-bg-deep px-1 py-0.5 font-mono">ce:GetCostAndUsage</code>
+            </li>
+            <li>
+              Copy the <strong>Identity Pool ID</strong> (e.g.
+              <code class="font-mono">ap-southeast-1:xxxx…</code>) and the
+              <strong>unauthenticated Role ARN</strong> from the IAM console, then paste both above.
+            </li>
+            <li>
+              Select the matching <strong>Region</strong> and click <em>Connect via Cognito</em>.
+            </li>
+          </ol>
+          <p class="mt-2 text-text-dim">
+            No long-lived keys are created. Sessions expire automatically after 5 minutes.
+          </p>
+        </div>
+      </div>
+    </div>
+  </div>
+</template>
diff --git a/src/views/my-aws-dashboards/components/CostDashboard.vue b/src/views/my-aws-dashboards/components/CostDashboard.vue
new file mode 100644
index 00000000..00aa31ba
--- /dev/null
+++ b/src/views/my-aws-dashboards/components/CostDashboard.vue
@@ -0,0 +1,773 @@
+<script setup lang="ts">
+import { ref, computed, watch, onMounted, onUnmounted, watchEffect } from 'vue'
+import { useScriptTag } from '@vueuse/core'
+import { Icon } from '@iconify/vue'
+import type {
+  CostReport,
+  ChartType,
+  Granularity,
+  SortField,
+  SortDir,
+  ChartJsConstructor,
+  ChartJsInstance,
+  XLSXLibrary,
+} from '../types'
+import { buildChartConfig, CHART_COLORS } from '../utils/chartUtils'
+import { downloadCsv, downloadXlsx } from '../utils/exportUtils'
+
+const props = defineProps<{
+  report: CostReport
+  isDemoMode: boolean
+  hasCredentials: boolean
+  errorMessage: string
+}>()
+
+const emit = defineEmits<{
+  refresh: [
+    start: string,
+    end: string,
+    granularity: Granularity,
+    services: string[],
+    useReal: boolean,
+  ]
+  disconnect: []
+  cliOutput: [json: string, granularity: Granularity, services: string[]]
+}>()
+
+// ─── Paste CLI output ─────────────────────────────────────────────────────────
+
+const showCliPaste = ref(false)
+const cliPasteText = ref('')
+const cliPasteError = ref('')
+
+function handleCliSubmit(): void {
+  cliPasteError.value = ''
+  if (!cliPasteText.value.trim()) {
+    cliPasteError.value = 'Paste the JSON output from the AWS CLI command above.'
+    return
+  }
+  emit('cliOutput', cliPasteText.value, granularity.value, [...selectedServices.value])
+  showCliPaste.value = false
+  cliPasteText.value = ''
+}
+
+function handleCliCancel(): void {
+  showCliPaste.value = false
+  cliPasteText.value = ''
+  cliPasteError.value = ''
+}
+
+// ─── Filters ─────────────────────────────────────────────────────────────────
+
+const today = new Date().toISOString().slice(0, 10)
+
+const dateStart = ref('2026-01-01')
+const dateEnd = ref(today)
+const granularity = ref<Granularity>('MONTHLY')
+const chartType = ref<ChartType>('stacked')
+
+// Use real data when credentials are available; sync whenever credentials state changes
+const useRealData = ref(props.hasCredentials)
+watchEffect(() => {
+  useRealData.value = props.hasCredentials
+})
+
+// Services available in the current report (real or demo)
+const availableServices = computed(() => props.report.serviceBreakdown.map((s) => s.service))
+
+// Keep selectedServices in sync when the report changes (e.g. switching real↔demo)
+const selectedServices = ref<string[]>(availableServices.value)
+watch(availableServices, (next) => {
+  selectedServices.value = [...next]
+})
+
+// ─── Table sort ──────────────────────────────────────────────────────────────
+
+const sortField = ref<SortField>('cost')
+const sortDir = ref<SortDir>('desc')
+
+const sortedBreakdown = computed(() => {
+  const rows = [...props.report.serviceBreakdown]
+  rows.sort((a, b) => {
+    let cmp = 0
+    if (sortField.value === 'service') cmp = a.service.localeCompare(b.service)
+    else if (sortField.value === 'cost') cmp = a.cost - b.cost
+    else cmp = a.percentage - b.percentage
+    return sortDir.value === 'asc' ? cmp : -cmp
+  })
+  return rows
+})
+
+function setSort(field: SortField): void {
+  if (sortField.value === field) {
+    sortDir.value = sortDir.value === 'asc' ? 'desc' : 'asc'
+  } else {
+    sortField.value = field
+    sortDir.value = 'desc'
+  }
+}
+
+// ─── Summary cards ─────────────────────────────────────────────────────────
+
+const costTrend = computed(() => {
+  const { totalCost, previousTotalCost } = props.report
+  if (!previousTotalCost) return null
+  const delta = ((totalCost - previousTotalCost) / previousTotalCost) * 100
+  return { delta, up: delta >= 0 }
+})
+
+const topService = computed(() => props.report.serviceBreakdown[0] ?? null)
+
+const avgPeriodCost = computed(() => {
+  const count = props.report.timeSeries.length
+  return count > 0 ? props.report.totalCost / count : 0
+})
+
+// ─── Chart.js ────────────────────────────────────────────────────────────────
+
+const chartRef = ref<HTMLCanvasElement | null>(null)
+const isChartReady = ref(false)
+let chartInstance: ChartJsInstance | null = null
+
+useScriptTag('https://cdn.jsdelivr.net/npm/chart.js@4.4.7/dist/chart.umd.min.js', () => {
+  isChartReady.value = true
+})
+
+function initChart(): void {
+  if (!chartRef.value || !isChartReady.value) return
+  const ChartJs = (window as Window & { Chart?: ChartJsConstructor }).Chart
+  if (!ChartJs) return
+
+  if (chartInstance) {
+    chartInstance.destroy()
+    chartInstance = null
+  }
+
+  const visibleServices = selectedServices.value
+  const filteredReport: CostReport = {
+    ...props.report,
+    serviceBreakdown: props.report.serviceBreakdown.filter((s) =>
+      visibleServices.includes(s.service),
+    ),
+    timeSeries: props.report.timeSeries.map((p) => {
+      const filtered: Record<string, number> = {}
+      visibleServices.forEach((svc) => {
+        if (p.services[svc] !== undefined) filtered[svc] = p.services[svc] ?? 0
+      })
+      return { ...p, services: filtered }
+    }),
+  }
+
+  const config = buildChartConfig(filteredReport, chartType.value)
+  chartInstance = new ChartJs(chartRef.value, config)
+}
+
+watch([isChartReady, chartType, () => props.report, selectedServices], initChart, { deep: false })
+
+onMounted(() => {
+  if (isChartReady.value) initChart()
+})
+
+onUnmounted(() => {
+  chartInstance?.destroy()
+  chartInstance = null
+})
+
+// ─── Service filter ───────────────────────────────────────────────────────────
+
+function toggleService(svc: string): void {
+  const idx = selectedServices.value.indexOf(svc)
+  if (idx >= 0) {
+    selectedServices.value = selectedServices.value.filter((s) => s !== svc)
+  } else {
+    selectedServices.value = [...selectedServices.value, svc]
+  }
+}
+
+function selectAllServices(): void {
+  selectedServices.value = [...availableServices.value]
+}
+
+function clearServices(): void {
+  selectedServices.value = []
+}
+
+// ─── Refresh ─────────────────────────────────────────────────────────────────
+
+function handleRefresh(): void {
+  emit(
+    'refresh',
+    dateStart.value,
+    dateEnd.value,
+    granularity.value,
+    [...selectedServices.value],
+    useRealData.value,
+  )
+}
+
+function handleDisconnect(): void {
+  emit('disconnect')
+}
+
+function handleToggleGranularity(g: Granularity): void {
+  granularity.value = g
+}
+
+function handleChartType(t: ChartType): void {
+  chartType.value = t
+}
+
+function handleToggleRealData(): void {
+  useRealData.value = !useRealData.value
+}
+
+// ─── Export ──────────────────────────────────────────────────────────────────
+
+const isExporting = ref(false)
+const isXlsxLoaded = ref(false)
+
+const { load: loadXlsxScript } = useScriptTag(
+  'https://cdn.jsdelivr.net/npm/xlsx@0.18.5/dist/xlsx.full.min.js',
+  () => {
+    isXlsxLoaded.value = true
+  },
+  { manual: true },
+)
+
+async function handleDownloadCsv(): Promise<void> {
+  downloadCsv(props.report)
+}
+
+async function handleDownloadXlsx(): Promise<void> {
+  isExporting.value = true
+  try {
+    if (!isXlsxLoaded.value) await loadXlsxScript(true)
+    const xlsx = (window as Window & { XLSX?: XLSXLibrary }).XLSX
+    if (!xlsx) throw new Error('XLSX library did not load')
+    await downloadXlsx(props.report, xlsx)
+  } finally {
+    isExporting.value = false
+  }
+}
+
+// ─── Formatting helpers ───────────────────────────────────────────────────────
+
+function formatUSD(value: number): string {
+  return new Intl.NumberFormat('en-US', { style: 'currency', currency: 'USD' }).format(value)
+}
+
+function serviceColor(index: number): string {
+  return CHART_COLORS[index % CHART_COLORS.length] ?? '#FF6B4A'
+}
+
+function getSortIcon(field: SortField): string {
+  if (sortField.value !== field) return 'lucide:chevrons-up-down'
+  return sortDir.value === 'asc' ? 'lucide:chevron-up' : 'lucide:chevron-down'
+}
+
+const chartTypeOptions: { type: ChartType; icon: string; label: string }[] = [
+  { type: 'bar', icon: 'lucide:bar-chart-2', label: 'Grouped Bar' },
+  { type: 'stacked', icon: 'lucide:layers', label: 'Stacked Bar' },
+  { type: 'line', icon: 'lucide:line-chart', label: 'Line Chart' },
+  { type: 'pie', icon: 'lucide:pie-chart', label: 'Donut Chart' },
+]
+</script>
+
+<template>
+  <div class="space-y-6">
+    <!-- Status Banners -->
+    <div
+      v-if="isDemoMode"
+      class="flex items-center gap-3 border border-accent-sky/30 bg-accent-sky/5 px-4 py-3"
+    >
+      <Icon icon="lucide:info" class="size-4 shrink-0 text-accent-sky" />
+      <p class="text-sm text-text-secondary">
+        <span class="font-semibold text-accent-sky">Demo Mode</span> — Showing simulated AWS cost
+        data. Connect your AWS account to see real billing information.
+      </p>
+    </div>
+
+    <div v-if="errorMessage" class="border border-red-500/30 bg-red-500/5">
+      <!-- Error header -->
+      <div class="flex items-start gap-3 px-4 py-3">
+        <Icon icon="lucide:alert-triangle" class="mt-0.5 size-4 shrink-0 text-red-400" />
+        <div class="min-w-0 flex-1">
+          <p class="text-sm text-red-400">{{ errorMessage }}</p>
+          <!-- Cost Explorer not activated guidance -->
+          <p
+            v-if="
+              errorMessage.includes('UnknownOperation') ||
+              errorMessage.includes('not been activated')
+            "
+            class="mt-2 text-xs text-text-secondary"
+          >
+            <Icon icon="lucide:external-link" class="mr-1 inline size-3" />
+            Enable Cost Explorer:
+            <a
+              href="https://console.aws.amazon.com/cost-management/home#/cost-explorer"
+              target="_blank"
+              rel="noopener noreferrer"
+              class="text-accent-sky underline hover:text-accent-sky/80"
+            >
+              AWS Billing Console → Cost Explorer
+            </a>
+          </p>
+
+          <!-- CLI command to copy -->
+          <p class="mt-2 text-xs text-text-dim">Run in your terminal to get real data:</p>
+          <code
+            class="mt-1 block break-all rounded bg-bg-deep px-2 py-1.5 font-mono text-xs text-accent-amber"
+          >
+            aws ce get-cost-and-usage --time-period Start={{ report.dateRange.start }},End={{
+              report.dateRange.end
+            }}
+            --granularity {{ report.granularity }} --group-by Type=DIMENSION,Key=SERVICE --metrics
+            BlendedCost
+          </code>
+
+          <!-- Paste output CTA -->
+          <button
+            v-if="!showCliPaste"
+            type="button"
+            class="mt-3 flex items-center gap-1.5 border border-accent-sky/40 bg-accent-sky/10 px-3 py-1.5 font-display text-xs font-semibold text-accent-sky transition-colors hover:bg-accent-sky/20"
+            @click="showCliPaste = true"
+          >
+            <Icon icon="lucide:clipboard-paste" class="size-3.5" />
+            Paste CLI output to load real data
+          </button>
+        </div>
+      </div>
+
+      <!-- Paste panel -->
+      <div v-if="showCliPaste" class="border-t border-red-500/20 px-4 py-3">
+        <p class="mb-2 font-display text-xs font-semibold text-text-secondary">
+          Paste AWS CLI JSON output:
+        </p>
+        <textarea
+          v-model="cliPasteText"
+          rows="6"
+          spellcheck="false"
+          autocomplete="off"
+          placeholder='{ "ResultsByTime": [ ... ] }'
+          class="w-full resize-y border border-border-default bg-bg-deep px-3 py-2 font-mono text-xs text-text-primary placeholder:text-text-dim focus:border-accent-sky focus:outline-none"
+        />
+        <p v-if="cliPasteError" class="mt-1 text-xs text-red-400">{{ cliPasteError }}</p>
+        <div class="mt-2 flex gap-2">
+          <button
+            type="button"
+            class="flex items-center gap-1.5 bg-accent-sky px-3 py-1.5 font-display text-xs font-semibold text-bg-deep transition-opacity hover:opacity-90"
+            @click="handleCliSubmit"
+          >
+            <Icon icon="lucide:check" class="size-3.5" />
+            Load Data
+          </button>
+          <button
+            type="button"
+            class="flex items-center gap-1.5 border border-border-default px-3 py-1.5 font-display text-xs text-text-dim hover:text-text-secondary"
+            @click="handleCliCancel"
+          >
+            Cancel
+          </button>
+        </div>
+      </div>
+    </div>
+
+    <!-- Filters Row -->
+    <div class="border border-border-default bg-bg-surface p-4">
+      <div class="flex flex-wrap items-end gap-4">
+        <!-- Date Range -->
+        <div class="flex flex-wrap gap-3">
+          <div>
+            <label class="mb-1.5 block font-display text-xs tracking-wide text-text-dim"
+              >FROM</label
+            >
+            <input
+              v-model="dateStart"
+              type="date"
+              :max="dateEnd"
+              class="border border-border-default bg-bg-deep px-3 py-2 text-sm text-text-primary focus:border-accent-coral focus:outline-none"
+            />
+          </div>
+          <div>
+            <label class="mb-1.5 block font-display text-xs tracking-wide text-text-dim">TO</label>
+            <input
+              v-model="dateEnd"
+              type="date"
+              :min="dateStart"
+              :max="today"
+              class="border border-border-default bg-bg-deep px-3 py-2 text-sm text-text-primary focus:border-accent-coral focus:outline-none"
+            />
+          </div>
+        </div>
+
+        <!-- Granularity -->
+        <div>
+          <label class="mb-1.5 block font-display text-xs tracking-wide text-text-dim"
+            >GRANULARITY</label
+          >
+          <div class="flex border border-border-default">
+            <button
+              v-for="g in ['DAILY', 'MONTHLY'] as Granularity[]"
+              :key="g"
+              type="button"
+              class="px-4 py-2 font-display text-xs font-semibold transition-colors"
+              :class="
+                granularity === g
+                  ? 'bg-accent-coral text-bg-deep'
+                  : 'bg-bg-deep text-text-secondary hover:text-text-primary'
+              "
+              @click="handleToggleGranularity(g)"
+            >
+              {{ g.charAt(0) + g.slice(1).toLowerCase() }}
+            </button>
+          </div>
+        </div>
+
+        <!-- Real Data toggle -->
+        <div v-if="hasCredentials">
+          <label class="mb-1.5 block font-display text-xs tracking-wide text-text-dim"
+            >DATA SOURCE</label
+          >
+          <button
+            type="button"
+            class="flex items-center gap-2 border px-3 py-2 font-display text-xs font-semibold transition-colors"
+            :class="
+              useRealData
+                ? 'border-accent-sky/40 bg-accent-sky/10 text-accent-sky'
+                : 'border-border-default bg-bg-deep text-text-secondary hover:border-border-default hover:text-text-primary'
+            "
+            @click="handleToggleRealData"
+          >
+            <Icon :icon="useRealData ? 'lucide:cloud' : 'lucide:database'" class="size-3.5" />
+            {{ useRealData ? 'Live AWS' : 'Demo Data' }}
+          </button>
+        </div>
+
+        <!-- Apply + Disconnect -->
+        <div class="ml-auto flex gap-2">
+          <button
+            v-if="hasCredentials"
+            type="button"
+            class="flex items-center gap-1.5 border border-border-default bg-bg-elevated px-3 py-2 font-display text-xs text-text-dim transition-colors hover:border-red-500/50 hover:text-red-400"
+            @click="handleDisconnect"
+          >
+            <Icon icon="lucide:unplug" class="size-3.5" />
+            Disconnect
+          </button>
+          <button
+            type="button"
+            class="flex items-center gap-1.5 bg-accent-coral px-4 py-2 font-display text-xs font-semibold text-bg-deep transition-opacity hover:opacity-90"
+            @click="handleRefresh"
+          >
+            <Icon icon="lucide:refresh-cw" class="size-3.5" />
+            Apply Filters
+          </button>
+        </div>
+      </div>
+    </div>
+
+    <!-- Summary Cards -->
+    <div class="grid grid-cols-2 gap-4 lg:grid-cols-4">
+      <!-- Total Cost -->
+      <div
+        class="border border-border-default bg-bg-surface p-4 hover:border-accent-coral/50 transition-colors"
+      >
+        <p class="mb-1 font-display text-xs tracking-wide text-text-dim">TOTAL COST</p>
+        <p class="font-display text-2xl font-bold text-text-primary">
+          {{ formatUSD(report.totalCost) }}
+        </p>
+        <div v-if="costTrend" class="mt-2 flex items-center gap-1">
+          <Icon
+            :icon="costTrend.up ? 'lucide:trending-up' : 'lucide:trending-down'"
+            class="size-3.5"
+            :class="costTrend.up ? 'text-red-400' : 'text-emerald-400'"
+          />
+          <span
+            class="font-display text-xs"
+            :class="costTrend.up ? 'text-red-400' : 'text-emerald-400'"
+          >
+            {{ costTrend.up ? '+' : '' }}{{ costTrend.delta.toFixed(1) }}% vs prev period
+          </span>
+        </div>
+      </div>
+
+      <!-- Top Service -->
+      <div
+        class="border border-border-default bg-bg-surface p-4 hover:border-accent-amber/50 transition-colors"
+      >
+        <p class="mb-1 font-display text-xs tracking-wide text-text-dim">TOP SERVICE</p>
+        <p
+          class="font-display text-lg font-bold text-accent-amber truncate"
+          :title="topService?.service"
+        >
+          {{ topService?.service ?? '—' }}
+        </p>
+        <p class="mt-1 font-display text-sm text-text-secondary">
+          {{ topService ? formatUSD(topService.cost) : '' }}
+          <span v-if="topService" class="text-text-dim">({{ topService.percentage }}%)</span>
+        </p>
+      </div>
+
+      <!-- Avg per Period -->
+      <div
+        class="border border-border-default bg-bg-surface p-4 hover:border-accent-sky/50 transition-colors"
+      >
+        <p class="mb-1 font-display text-xs tracking-wide text-text-dim">
+          AVG PER {{ granularity === 'MONTHLY' ? 'MONTH' : 'DAY' }}
+        </p>
+        <p class="font-display text-2xl font-bold text-text-primary">
+          {{ formatUSD(avgPeriodCost) }}
+        </p>
+        <p class="mt-1 font-display text-xs text-text-dim">
+          over {{ report.timeSeries.length }}
+          {{ granularity === 'MONTHLY' ? 'months' : 'days' }}
+        </p>
+      </div>
+
+      <!-- Services Count -->
+      <div
+        class="border border-border-default bg-bg-surface p-4 hover:border-border-default transition-colors"
+      >
+        <p class="mb-1 font-display text-xs tracking-wide text-text-dim">SERVICES</p>
+        <p class="font-display text-2xl font-bold text-text-primary">
+          {{ report.serviceBreakdown.length }}
+        </p>
+        <p class="mt-1 font-display text-xs text-text-dim">active AWS services</p>
+      </div>
+    </div>
+
+    <!-- Chart Section -->
+    <div class="border border-border-default bg-bg-surface">
+      <!-- Chart Toolbar -->
+      <div
+        class="flex flex-wrap items-center justify-between gap-3 border-b border-border-default px-4 py-3"
+      >
+        <h2 class="flex items-center gap-2 font-display text-sm font-semibold text-text-primary">
+          <span class="text-accent-coral font-display text-xs tracking-widest">//</span>
+          Cost Over Time
+        </h2>
+
+        <!-- Chart type selector -->
+        <div class="flex gap-1">
+          <button
+            v-for="opt in chartTypeOptions"
+            :key="opt.type"
+            type="button"
+            :title="opt.label"
+            class="flex items-center gap-1.5 border px-2.5 py-1.5 font-display text-xs transition-colors"
+            :class="
+              chartType === opt.type
+                ? 'border-accent-coral bg-accent-coral/10 text-accent-coral'
+                : 'border-border-default bg-bg-deep text-text-dim hover:text-text-secondary'
+            "
+            @click="handleChartType(opt.type)"
+          >
+            <Icon :icon="opt.icon" class="size-3.5" />
+            <span class="hidden sm:inline">{{ opt.label }}</span>
+          </button>
+        </div>
+      </div>
+
+      <!-- Canvas -->
+      <div class="relative px-4 pb-4 pt-2" style="height: 380px">
+        <canvas ref="chartRef" />
+        <div
+          v-if="!isChartReady"
+          class="absolute inset-0 flex items-center justify-center bg-bg-surface"
+        >
+          <div class="flex flex-col items-center gap-3">
+            <Icon icon="lucide:loader-circle" class="size-8 animate-spin text-accent-coral" />
+            <p class="font-display text-xs text-text-dim">Loading chart engine…</p>
+          </div>
+        </div>
+      </div>
+    </div>
+
+    <!-- Service Breakdown Table + Filter -->
+    <div class="grid gap-6 lg:grid-cols-3">
+      <!-- Service Filter -->
+      <div class="border border-border-default bg-bg-surface p-4">
+        <div class="mb-3 flex items-center justify-between">
+          <h3 class="flex items-center gap-2 font-display text-sm font-semibold text-text-primary">
+            <span class="text-accent-amber font-display text-xs tracking-widest">//</span>
+            Services
+          </h3>
+          <div class="flex gap-2">
+            <button
+              type="button"
+              class="font-display text-xs text-accent-sky hover:underline"
+              @click="selectAllServices"
+            >
+              All
+            </button>
+            <span class="text-text-dim">/</span>
+            <button
+              type="button"
+              class="font-display text-xs text-text-dim hover:text-text-secondary hover:underline"
+              @click="clearServices"
+            >
+              None
+            </button>
+          </div>
+        </div>
+
+        <div class="space-y-1.5">
+          <label
+            v-for="(svc, i) in availableServices"
+            :key="svc"
+            class="flex cursor-pointer items-center gap-2.5 py-1.5 group"
+          >
+            <span
+              class="flex size-3.5 shrink-0 items-center justify-center border transition-colors"
+              :style="{
+                borderColor: selectedServices.includes(svc) ? serviceColor(i) : '#253549',
+                backgroundColor: selectedServices.includes(svc)
+                  ? serviceColor(i) + '20'
+                  : 'transparent',
+              }"
+            >
+              <Icon
+                v-if="selectedServices.includes(svc)"
+                icon="lucide:check"
+                class="size-2.5"
+                :style="{ color: serviceColor(i) }"
+              />
+            </span>
+            <input
+              type="checkbox"
+              class="sr-only"
+              :checked="selectedServices.includes(svc)"
+              @change="toggleService(svc)"
+            />
+            <span class="truncate text-xs text-text-secondary group-hover:text-text-primary">
+              {{ svc }}
+            </span>
+          </label>
+        </div>
+      </div>
+
+      <!-- Breakdown Table -->
+      <div class="border border-border-default bg-bg-surface lg:col-span-2">
+        <div class="flex items-center justify-between border-b border-border-default px-4 py-3">
+          <h3 class="flex items-center gap-2 font-display text-sm font-semibold text-text-primary">
+            <span class="text-accent-coral font-display text-xs tracking-widest">//</span>
+            Service Breakdown
+          </h3>
+
+          <!-- Export Buttons -->
+          <div class="flex gap-2">
+            <button
+              type="button"
+              class="flex items-center gap-1.5 border border-border-default bg-bg-elevated px-2.5 py-1.5 font-display text-xs text-text-secondary transition-colors hover:border-accent-sky/50 hover:text-accent-sky"
+              @click="handleDownloadCsv"
+            >
+              <Icon icon="lucide:file-text" class="size-3.5" />
+              CSV
+            </button>
+            <button
+              type="button"
+              :disabled="isExporting"
+              class="flex items-center gap-1.5 border border-border-default bg-bg-elevated px-2.5 py-1.5 font-display text-xs text-text-secondary transition-colors hover:border-accent-amber/50 hover:text-accent-amber disabled:cursor-not-allowed disabled:opacity-50"
+              @click="handleDownloadXlsx"
+            >
+              <Icon
+                :icon="isExporting ? 'lucide:loader-circle' : 'lucide:file-spreadsheet'"
+                class="size-3.5"
+                :class="{ 'animate-spin': isExporting }"
+              />
+              XLSX
+            </button>
+          </div>
+        </div>
+
+        <div class="overflow-x-auto">
+          <table class="w-full text-sm">
+            <thead>
+              <tr class="border-b border-border-default">
+                <th class="px-4 py-3 text-left">
+                  <button
+                    type="button"
+                    class="flex items-center gap-1 font-display text-xs tracking-wide text-text-dim hover:text-text-secondary"
+                    @click="setSort('service')"
+                  >
+                    SERVICE
+                    <Icon :icon="getSortIcon('service')" class="size-3" />
+                  </button>
+                </th>
+                <th class="px-4 py-3 text-right">
+                  <button
+                    type="button"
+                    class="ml-auto flex items-center gap-1 font-display text-xs tracking-wide text-text-dim hover:text-text-secondary"
+                    @click="setSort('cost')"
+                  >
+                    COST
+                    <Icon :icon="getSortIcon('cost')" class="size-3" />
+                  </button>
+                </th>
+                <th class="px-4 py-3 text-right">
+                  <button
+                    type="button"
+                    class="ml-auto flex items-center gap-1 font-display text-xs tracking-wide text-text-dim hover:text-text-secondary"
+                    @click="setSort('percentage')"
+                  >
+                    %
+                    <Icon :icon="getSortIcon('percentage')" class="size-3" />
+                  </button>
+                </th>
+                <th class="w-32 px-4 py-3 text-left">
+                  <span class="font-display text-xs tracking-wide text-text-dim">SHARE</span>
+                </th>
+              </tr>
+            </thead>
+            <tbody>
+              <tr
+                v-for="(entry, i) in sortedBreakdown"
+                :key="entry.service"
+                class="border-b border-border-default/50 hover:bg-bg-elevated transition-colors"
+              >
+                <td class="px-4 py-3">
+                  <div class="flex items-center gap-2">
+                    <span
+                      class="size-2.5 shrink-0 rounded-full"
+                      :style="{ backgroundColor: serviceColor(i) }"
+                    />
+                    <span class="text-text-primary">{{ entry.service }}</span>
+                  </div>
+                </td>
+                <td class="px-4 py-3 text-right font-mono text-text-primary">
+                  {{ formatUSD(entry.cost) }}
+                </td>
+                <td class="px-4 py-3 text-right font-display text-xs text-text-secondary">
+                  {{ entry.percentage }}%
+                </td>
+                <td class="px-4 py-3">
+                  <div class="h-1.5 w-full bg-bg-deep">
+                    <div
+                      class="h-full transition-all duration-500"
+                      :style="{
+                        width: `${entry.percentage}%`,
+                        backgroundColor: serviceColor(i),
+                      }"
+                    />
+                  </div>
+                </td>
+              </tr>
+            </tbody>
+            <tfoot>
+              <tr class="border-t border-border-default bg-bg-elevated">
+                <td class="px-4 py-3 font-display text-xs font-semibold text-text-secondary">
+                  TOTAL
+                </td>
+                <td class="px-4 py-3 text-right font-mono font-semibold text-accent-coral">
+                  {{ formatUSD(report.totalCost) }}
+                </td>
+                <td class="px-4 py-3 text-right font-display text-xs text-text-dim">100%</td>
+                <td />
+              </tr>
+            </tfoot>
+          </table>
+        </div>
+      </div>
+    </div>
+  </div>
+</template>
diff --git a/src/views/my-aws-dashboards/composables/useAwsCost.ts b/src/views/my-aws-dashboards/composables/useAwsCost.ts
new file mode 100644
index 00000000..0e587170
--- /dev/null
+++ b/src/views/my-aws-dashboards/composables/useAwsCost.ts
@@ -0,0 +1,287 @@
+import { ref, computed } from 'vue'
+import type { CostReport, Granularity } from '../types'
+import { generateDemoReport } from '../utils/demoData'
+import { signRequest } from '../utils/sigv4'
+
+export type FetchStatus = 'idle' | 'loading' | 'demo' | 'error'
+
+type AwsCostResponse = {
+  ResultsByTime: {
+    TimePeriod: { Start: string }
+    Groups: { Keys: string[]; Metrics: { BlendedCost: { Amount: string; Unit: string } } }[]
+    Total?: { BlendedCost?: { Amount: string } }
+  }[]
+}
+
+function parseAwsResponse(
+  data: AwsCostResponse,
+  start: string,
+  end: string,
+  granularity: Granularity,
+  selectedServices: string[],
+): CostReport {
+  const allServices = new Set<string>()
+  data.ResultsByTime.forEach((result) => {
+    result.Groups.forEach((g) => {
+      const svc = g.Keys[0]
+      if (svc) allServices.add(svc)
+    })
+  })
+
+  const services = [...allServices]
+  const filtered =
+    selectedServices.length > 0 ? services.filter((s) => selectedServices.includes(s)) : services
+
+  const timeSeries = data.ResultsByTime.map((result) => {
+    const period = result.TimePeriod.Start
+    const servicesMap: Record<string, number> = {}
+    let total = 0
+
+    result.Groups.filter((g) => {
+      const svc = g.Keys[0]
+      return svc && (filtered.length === 0 || filtered.includes(svc))
+    }).forEach((g) => {
+      const svc = g.Keys[0] ?? ''
+      const amount = parseFloat(g.Metrics.BlendedCost.Amount)
+      servicesMap[svc] = Math.round(amount * 100) / 100
+      total += amount
+    })
+
+    total = Math.round(total * 100) / 100
+    return { period, label: period, services: servicesMap, total }
+  })
+
+  const totalCost = Math.round(timeSeries.reduce((s, p) => s + p.total, 0) * 100) / 100
+  const serviceBreakdown = filtered
+    .map((svc) => ({
+      service: svc,
+      cost: Math.round(timeSeries.reduce((s, p) => s + (p.services[svc] ?? 0), 0) * 100) / 100,
+      percentage: 0,
+      unit: 'USD',
+    }))
+    .map((e) => ({
+      ...e,
+      percentage: totalCost > 0 ? Math.round((e.cost / totalCost) * 10000) / 100 : 0,
+    }))
+    .sort((a, b) => b.cost - a.cost)
+
+  return {
+    dateRange: { start, end },
+    granularity,
+    currency: 'USD',
+    totalCost,
+    previousTotalCost: 0,
+    timeSeries,
+    serviceBreakdown,
+  }
+}
+
+export function useAwsCost() {
+  const status = ref<FetchStatus>('idle')
+  const errorMessage = ref('')
+  const report = ref<CostReport | null>(null)
+  const isDemoMode = ref(true)
+
+  const isLoading = computed(() => status.value === 'loading')
+  const hasReport = computed(() => report.value !== null)
+
+  function loadDemoData(
+    start: string,
+    end: string,
+    granularity: Granularity,
+    selectedServices: string[],
+  ): void {
+    status.value = 'loading'
+    // Simulate a small async delay for UX
+    setTimeout(() => {
+      report.value = generateDemoReport(start, end, granularity, selectedServices)
+      status.value = 'demo'
+      isDemoMode.value = true
+    }, 400)
+  }
+
+  /**
+   * NOTE: AWS Cost Explorer API does NOT support CORS for browser requests.
+   * Direct browser calls to https://ce.us-east-1.amazonaws.com/ will fail
+   * with a CORS error regardless of credentials.
+   *
+   * This function signs each request with AWS Signature Version 4 (SigV4) and
+   * attempts the call, then falls back to demo mode on failure.
+   * To use real data without CORS issues, run the equivalent AWS CLI command:
+   *   aws ce get-cost-and-usage --time-period Start=<start>,End=<end> \
+   *     --granularity MONTHLY --group-by Type=DIMENSION,Key=SERVICE \
+   *     --metrics BlendedCost
+   */
+  async function loadRealData(
+    accessKeyId: string,
+    secretAccessKey: string,
+    sessionToken: string,
+    region: string,
+    start: string,
+    end: string,
+    granularity: Granularity,
+    selectedServices: string[],
+  ): Promise<void> {
+    status.value = 'loading'
+    errorMessage.value = ''
+
+    try {
+      const SERVICE = 'ce'
+      // Cost Explorer endpoint is always us-east-1 regardless of the account region
+      const HOST = 'ce.us-east-1.amazonaws.com'
+      const TARGET = 'AWSInsightsIndexService.GetCostAndUsage'
+      const CONTENT_TYPE = 'application/x-amz-json-1.1'
+
+      const body = JSON.stringify({
+        TimePeriod: { Start: start, End: end },
+        Granularity: granularity,
+        GroupBy: [{ Type: 'DIMENSION', Key: 'SERVICE' }],
+        Metrics: ['BlendedCost'],
+      })
+
+      const signedHeaders = await signRequest({
+        accessKeyId,
+        secretAccessKey,
+        sessionToken: sessionToken || undefined,
+        region: 'us-east-1', // CE is a global service, always us-east-1
+        service: SERVICE,
+        host: HOST,
+        method: 'POST',
+        path: '/',
+        body,
+        amzTarget: TARGET,
+        contentType: CONTENT_TYPE,
+      })
+
+      const response = await fetch(`https://${HOST}/`, {
+        method: 'POST',
+        headers: signedHeaders,
+        body,
+        signal: AbortSignal.timeout(15000),
+      })
+
+      if (!response.ok) {
+        // Parse AWS error body for a more helpful message
+        let awsErrorMsg = `HTTP ${response.status}`
+        try {
+          const errBody = (await response.json()) as {
+            __type?: string
+            message?: string
+            Message?: string
+          }
+          const errType = errBody.__type?.split('#').pop() ?? ''
+          const errDetail = errBody.message ?? errBody.Message ?? ''
+          if (errType) awsErrorMsg += `: ${errType}`
+          if (errDetail) awsErrorMsg += ` — ${errDetail}`
+
+          if (response.status === 400) {
+            if (errType.includes('InvalidSignature') || errType.includes('AuthFailure')) {
+              awsErrorMsg =
+                'Authentication failed (HTTP 400 InvalidSignatureException). Check that your Access Key ID and Secret Access Key are correct and have not expired.'
+            } else if (errType.includes('UnknownOperation')) {
+              awsErrorMsg =
+                'HTTP 400 UnknownOperationException — AWS could not identify the requested operation. ' +
+                'This usually means Cost Explorer has not been activated for your account. ' +
+                'Go to AWS Billing Console → Cost Explorer → "Enable Cost Explorer" and wait up to 24 hours for data to become available. ' +
+                'If you already enabled it, note that CORS-bypass browser extensions can strip signed headers, causing this error.'
+            } else if (errType.includes('ValidationException')) {
+              awsErrorMsg = `Invalid request parameters (HTTP 400 ValidationException): ${errDetail}`
+            } else if (errType.includes('DataUnavailable')) {
+              awsErrorMsg =
+                'Cost data is not yet available for this account (HTTP 400 DataUnavailableException). Cost Explorer must be enabled in the AWS Billing console first.'
+            } else if (!errType) {
+              awsErrorMsg =
+                'HTTP 400 Bad Request — The request was rejected by AWS. This is usually caused by missing or invalid AWS Signature headers. Ensure your credentials are valid.'
+            }
+          } else if (response.status === 403) {
+            awsErrorMsg = `Access denied (HTTP 403${errType ? ` ${errType}` : ''}). Ensure your IAM user has the "ce:GetCostAndUsage" permission.`
+          }
+        } catch {
+          // could not parse JSON body — keep the generic message
+        }
+        throw new Error(awsErrorMsg)
+      }
+
+      // Parse the response
+      const data = (await response.json()) as AwsCostResponse
+      if (!data.ResultsByTime) throw new Error('Unexpected response format')
+
+      // Parse and store
+      report.value = parseAwsResponse(data, start, end, granularity, selectedServices)
+      status.value = 'idle'
+      isDemoMode.value = false
+    } catch (err) {
+      let msg: string
+      if (err instanceof TypeError) {
+        // Network-level failure — almost always a CORS block
+        msg =
+          'CORS Error: AWS Cost Explorer does not allow direct browser requests. Showing demo data instead. Use the AWS CLI for real data.'
+      } else if (err instanceof DOMException && err.name === 'TimeoutError') {
+        msg = 'Request timed out. Check your network connection and try again.'
+      } else if (err instanceof Error) {
+        msg = err.message
+      } else {
+        msg = 'Unknown error'
+      }
+
+      errorMessage.value = msg
+      status.value = 'error'
+      // Fall back to demo data
+      loadDemoData(start, end, granularity, selectedServices)
+    }
+  }
+
+  /**
+   * Parse and load data from pasted AWS CLI JSON output.
+   * Accepts the raw JSON string returned by:
+   *   aws ce get-cost-and-usage --granularity MONTHLY ...
+   */
+  function loadFromCliOutput(
+    jsonString: string,
+    granularity: Granularity,
+    selectedServices: string[],
+  ): string | null {
+    let parsed: unknown
+    try {
+      parsed = JSON.parse(jsonString.trim())
+    } catch {
+      return 'Invalid JSON — paste the raw output from the AWS CLI command.'
+    }
+
+    if (
+      typeof parsed !== 'object' ||
+      parsed === null ||
+      !('ResultsByTime' in parsed) ||
+      !Array.isArray((parsed as Record<string, unknown>).ResultsByTime)
+    ) {
+      return 'Unrecognised format. Expected AWS CLI output with a "ResultsByTime" array.'
+    }
+
+    const data = parsed as AwsCostResponse
+    if (data.ResultsByTime.length === 0) {
+      return 'No cost data found in the provided output. The date range may have no billing data.'
+    }
+
+    const start = data.ResultsByTime[0]?.TimePeriod.Start ?? ''
+    const last = data.ResultsByTime[data.ResultsByTime.length - 1]
+    const end = last?.TimePeriod.Start ?? start
+
+    report.value = parseAwsResponse(data, start, end, granularity, selectedServices)
+    status.value = 'idle'
+    isDemoMode.value = false
+    errorMessage.value = ''
+    return null // success
+  }
+
+  return {
+    status,
+    errorMessage,
+    report,
+    isDemoMode,
+    isLoading,
+    hasReport,
+    loadDemoData,
+    loadRealData,
+    loadFromCliOutput,
+  }
+}
diff --git a/src/views/my-aws-dashboards/composables/useCognitoAuth.ts b/src/views/my-aws-dashboards/composables/useCognitoAuth.ts
new file mode 100644
index 00000000..6a32adea
--- /dev/null
+++ b/src/views/my-aws-dashboards/composables/useCognitoAuth.ts
@@ -0,0 +1,230 @@
+/**
+ * Cognito Identity Pool authentication composable.
+ *
+ * Security model:
+ *  - Only the non-secret Identity Pool ID is persisted to localStorage.
+ *  - Temporary STS credentials are stored in sessionStorage (tab-scoped —
+ *    cleared automatically when the tab closes, exactly like in-memory storage
+ *    across a page refresh). This allows an intentional F5 refresh to resume
+ *    the session without a round-trip to Cognito.
+ *  - On explicit logout or session expiry the sessionStorage entry is removed.
+ *  - The app enforces a 5-minute session limit client-side and auto-logs out.
+ */
+
+import { ref, computed } from 'vue'
+import { useLocalStorage } from '@vueuse/core'
+import type { CognitoConfig, CognitoSession } from '../types'
+import { getCognitoCredentials } from '../utils/cognitoClient'
+
+// ─── Constants ────────────────────────────────────────────────────────────────
+
+const SESSION_DURATION_MS = 5 * 60 * 1000 // 5 minutes
+const CONFIG_STORAGE_KEY = 'my-aws-dashboard:cognito-config'
+/**
+ * Stores the full session object in sessionStorage so a page refresh can
+ * restore it without a Cognito round-trip.
+ * sessionStorage is tab-scoped: the browser clears it when the tab is closed,
+ * giving the same isolation guarantee as an in-memory ref.
+ */
+const SESSION_STORAGE_KEY = 'my-aws-dashboard:session'
+
+// ─── Module-level singletons (shared across all composable instances) ─────────
+
+/** Temporary credentials — kept in memory after restore from sessionStorage */
+const session = ref<CognitoSession | null>(null)
+const isAuthLoading = ref(false)
+const authError = ref('')
+/** Seconds remaining in the current session (0 when not authenticated) */
+const remainingSeconds = ref(0)
+
+let logoutTimer: ReturnType<typeof setTimeout> | null = null
+let tickInterval: ReturnType<typeof setInterval> | null = null
+
+function stopTimers(): void {
+  if (logoutTimer !== null) {
+    clearTimeout(logoutTimer)
+    logoutTimer = null
+  }
+  if (tickInterval !== null) {
+    clearInterval(tickInterval)
+    tickInterval = null
+  }
+}
+
+function startTimers(expiresAt: number): void {
+  stopTimers()
+
+  remainingSeconds.value = Math.ceil((expiresAt - Date.now()) / 1000)
+
+  // Update countdown every second
+  tickInterval = setInterval(() => {
+    if (session.value === null) {
+      if (tickInterval !== null) {
+        clearInterval(tickInterval)
+        tickInterval = null
+      }
+      return
+    }
+    const secs = Math.max(0, Math.ceil((session.value.expiresAt - Date.now()) / 1000))
+    remainingSeconds.value = secs
+    if (secs === 0) {
+      if (tickInterval !== null) {
+        clearInterval(tickInterval)
+        tickInterval = null
+      }
+    }
+  }, 1000)
+
+  // Auto-logout when the 5-minute session window expires
+  const msUntilExpiry = Math.max(0, expiresAt - Date.now())
+  logoutTimer = setTimeout(() => {
+    sessionStorage.removeItem(SESSION_STORAGE_KEY)
+    session.value = null
+    remainingSeconds.value = 0
+    stopTimers()
+    window.location.reload()
+  }, msUntilExpiry)
+}
+
+function persistSession(s: CognitoSession): void {
+  try {
+    sessionStorage.setItem(SESSION_STORAGE_KEY, JSON.stringify(s))
+  } catch {
+    // sessionStorage quota exceeded — non-fatal, session still lives in memory
+  }
+}
+
+function clearPersistedSession(): void {
+  sessionStorage.removeItem(SESSION_STORAGE_KEY)
+}
+
+// ─── Composable ───────────────────────────────────────────────────────────────
+
+export function useCognitoAuth() {
+  /** Non-secret Identity Pool configuration — safe to persist */
+  const config = useLocalStorage<CognitoConfig | null>(CONFIG_STORAGE_KEY, null)
+
+  const isAuthenticated = computed(
+    () => session.value !== null && Date.now() < session.value.expiresAt,
+  )
+
+  const hasConfig = computed(
+    () =>
+      config.value !== null &&
+      typeof config.value.identityPoolId === 'string' &&
+      config.value.identityPoolId.trim().length > 0,
+  )
+
+  /**
+   * Authenticate via Cognito Identity Pool.
+   * Fetches temporary STS credentials and starts the 5-minute session timer.
+   * Throws on failure so the caller can surface the error to the user.
+   */
+  async function login(cfg: CognitoConfig): Promise<void> {
+    isAuthLoading.value = true
+    authError.value = ''
+
+    try {
+      const creds = await getCognitoCredentials(
+        cfg.identityPoolId.trim(),
+        cfg.region,
+        cfg.roleArn.trim(),
+      )
+
+      // Persist only the non-secret config for reconnect UX
+      config.value = {
+        identityPoolId: cfg.identityPoolId.trim(),
+        region: cfg.region,
+        roleArn: cfg.roleArn.trim(),
+      }
+
+      const expiresAt = Date.now() + SESSION_DURATION_MS
+
+      const newSession: CognitoSession = {
+        accessKeyId: creds.accessKeyId,
+        secretAccessKey: creds.secretAccessKey,
+        sessionToken: creds.sessionToken,
+        identityId: creds.identityId,
+        region: cfg.region,
+        expiresAt,
+      }
+
+      // Store session in sessionStorage so a page refresh can restore it.
+      // sessionStorage is tab-scoped and cleared when the tab closes.
+      persistSession(newSession)
+      session.value = newSession
+
+      startTimers(expiresAt)
+    } catch (err) {
+      authError.value = err instanceof Error ? err.message : 'Cognito authentication failed.'
+      throw err
+    } finally {
+      isAuthLoading.value = false
+    }
+  }
+
+  /** End the current session (credentials wiped from memory and sessionStorage). */
+  function logout(): void {
+    clearPersistedSession()
+    stopTimers()
+    session.value = null
+    remainingSeconds.value = 0
+    authError.value = ''
+  }
+
+  /** Logout and clear saved Identity Pool config from localStorage. */
+  function clearConfig(): void {
+    logout()
+    config.value = null
+  }
+
+  /**
+   * Called on page load to restore an active session after an intentional
+   * page refresh. Reads the session directly from sessionStorage — no Cognito
+   * round-trip required. Returns true if a valid (non-expired) session was
+   * found and restored.
+   */
+  function initSession(): boolean {
+    const stored = sessionStorage.getItem(SESSION_STORAGE_KEY)
+    if (!stored) return false
+
+    let storedSession: CognitoSession
+    try {
+      storedSession = JSON.parse(stored) as CognitoSession
+    } catch {
+      clearPersistedSession()
+      return false
+    }
+
+    // Validate required fields and expiry
+    if (
+      !storedSession.accessKeyId ||
+      !storedSession.secretAccessKey ||
+      !storedSession.sessionToken ||
+      !storedSession.expiresAt ||
+      Date.now() >= storedSession.expiresAt
+    ) {
+      clearPersistedSession()
+      return false
+    }
+
+    // Session is still valid — restore it and resume the countdown
+    session.value = storedSession
+    startTimers(storedSession.expiresAt)
+    return true
+  }
+
+  return {
+    config,
+    session,
+    isAuthenticated,
+    hasConfig,
+    isAuthLoading,
+    authError,
+    remainingSeconds,
+    login,
+    logout,
+    clearConfig,
+    initSession,
+  }
+}
diff --git a/src/views/my-aws-dashboards/index.vue b/src/views/my-aws-dashboards/index.vue
new file mode 100644
index 00000000..890b9b3c
--- /dev/null
+++ b/src/views/my-aws-dashboards/index.vue
@@ -0,0 +1,392 @@
+<script setup lang="ts">
+import { onMounted, ref, computed } from 'vue'
+import { Icon } from '@iconify/vue'
+import { RouterLink } from 'vue-router'
+import { useHead } from '@unhead/vue'
+import { useCognitoAuth } from './composables/useCognitoAuth'
+import { useAwsCost } from './composables/useAwsCost'
+import AwsAuth from './components/AwsAuth.vue'
+import CostDashboard from './components/CostDashboard.vue'
+import type { CognitoConfig, Granularity } from './types'
+
+useHead({
+  title: 'My AWS Dashboards — Cost & Billing Monitor',
+  meta: [
+    {
+      name: 'description',
+      content:
+        'Monitor AWS resource costs with interactive charts, service breakdowns, and exportable reports.',
+    },
+  ],
+})
+
+const showAuth = ref(false)
+
+const {
+  config: cognitoConfig,
+  session,
+  isAuthenticated,
+  hasConfig,
+  isAuthLoading,
+  authError,
+  remainingSeconds,
+  login,
+  clearConfig,
+  initSession,
+} = useCognitoAuth()
+
+const {
+  errorMessage,
+  report,
+  isDemoMode,
+  isLoading,
+  hasReport,
+  loadDemoData,
+  loadRealData,
+  loadFromCliOutput,
+} = useAwsCost()
+
+const DEFAULT_START = '2026-01-01'
+const DEFAULT_END = new Date().toISOString().slice(0, 10)
+
+// ─── Session countdown display ────────────────────────────────────────────────
+
+const sessionCountdown = computed(() => {
+  if (!isAuthenticated.value) return ''
+  const total = remainingSeconds.value
+  const m = Math.floor(total / 60)
+  const s = total % 60
+  return `${m}:${String(s).padStart(2, '0')}`
+})
+
+const countdownUrgent = computed(() => remainingSeconds.value > 0 && remainingSeconds.value <= 60)
+
+// ─── Data fetching ────────────────────────────────────────────────────────────
+
+function fetchData(
+  start: string,
+  end: string,
+  granularity: Granularity,
+  services: string[],
+  useRealData: boolean,
+): void {
+  if (useRealData && isAuthenticated.value && session.value) {
+    loadRealData(
+      session.value.accessKeyId,
+      session.value.secretAccessKey,
+      session.value.sessionToken,
+      session.value.region,
+      start,
+      end,
+      granularity,
+      services,
+    )
+  } else {
+    loadDemoData(start, end, granularity, services)
+  }
+}
+
+// ─── Event handlers ───────────────────────────────────────────────────────────
+
+async function handleConnect(cfg: CognitoConfig): Promise<void> {
+  try {
+    await login(cfg)
+    showAuth.value = false
+    fetchData(DEFAULT_START, DEFAULT_END, 'MONTHLY', [], true)
+  } catch {
+    // authError reactive ref is already set by useCognitoAuth — shown in AwsAuth
+  }
+}
+
+function handleDemo(): void {
+  showAuth.value = false
+  loadDemoData(DEFAULT_START, DEFAULT_END, 'MONTHLY', [])
+}
+
+function handleRefresh(
+  start: string,
+  end: string,
+  granularity: Granularity,
+  services: string[],
+  useRealData: boolean,
+): void {
+  fetchData(start, end, granularity, services, useRealData)
+}
+
+function handleDisconnect(): void {
+  clearConfig()
+  window.location.reload()
+}
+
+function handleCliOutput(json: string, granularity: Granularity, services: string[]): void {
+  loadFromCliOutput(json, granularity, services)
+}
+
+onMounted(() => {
+  if (!hasReport.value && isAuthenticated.value && session.value) {
+    // Active in-memory session (same-tab navigation) — reload data
+    loadRealData(
+      session.value.accessKeyId,
+      session.value.secretAccessKey,
+      session.value.sessionToken,
+      session.value.region,
+      DEFAULT_START,
+      DEFAULT_END,
+      'MONTHLY',
+      [],
+    )
+    return
+  }
+
+  // Page refresh — restore session from sessionStorage (no Cognito round-trip).
+  // If the 5-minute window has not elapsed, resume the existing session and
+  // reload the dashboard data automatically.
+  const restored = initSession()
+  if (restored && session.value) {
+    loadRealData(
+      session.value.accessKeyId,
+      session.value.secretAccessKey,
+      session.value.sessionToken,
+      session.value.region,
+      DEFAULT_START,
+      DEFAULT_END,
+      'MONTHLY',
+      [],
+    )
+  }
+})
+</script>
+
+<template>
+  <div class="min-h-screen bg-bg-deep">
+    <!-- Header -->
+    <header class="border-b border-border-default bg-bg-surface">
+      <div class="mx-auto max-w-7xl px-4 py-4 sm:px-6">
+        <div class="flex flex-wrap items-center justify-between gap-3">
+          <!-- Logo + title -->
+          <div class="flex items-center gap-3">
+            <div
+              class="flex size-9 items-center justify-center border border-accent-coral bg-bg-elevated"
+            >
+              <Icon icon="lucide:cloud" class="size-5 text-accent-coral" />
+            </div>
+            <div>
+              <h1 class="font-display text-lg font-bold text-text-primary leading-none">
+                My <span class="text-accent-amber">AWS</span> Dashboard
+              </h1>
+              <p class="mt-0.5 font-display text-xs text-text-dim">Cost & Billing Monitor</p>
+            </div>
+          </div>
+
+          <!-- Nav -->
+          <nav class="flex items-center gap-3">
+            <!-- Active tab indicator -->
+            <div class="hidden items-center gap-1 sm:flex">
+              <button
+                type="button"
+                class="flex items-center gap-1.5 border border-accent-coral bg-accent-coral/10 px-3 py-1.5 font-display text-xs font-semibold text-accent-coral"
+              >
+                <Icon icon="lucide:dollar-sign" class="size-3.5" />
+                Cost & Billing
+              </button>
+              <!-- Placeholder for future dashboards -->
+              <button
+                type="button"
+                disabled
+                title="Coming soon"
+                class="flex cursor-not-allowed items-center gap-1.5 border border-border-default px-3 py-1.5 font-display text-xs text-text-dim opacity-50"
+              >
+                <Icon icon="lucide:server" class="size-3.5" />
+                Resources
+              </button>
+            </div>
+
+            <!-- Session countdown — shown when authenticated -->
+            <div
+              v-if="isAuthenticated"
+              class="flex items-center gap-1.5 border px-2.5 py-1.5 font-display text-xs"
+              :class="
+                countdownUrgent
+                  ? 'border-red-500/40 bg-red-500/5 text-red-400 animate-pulse'
+                  : 'border-accent-amber/30 bg-accent-amber/5 text-accent-amber'
+              "
+              :title="`Session expires in ${sessionCountdown}`"
+            >
+              <Icon icon="lucide:timer" class="size-3.5" />
+              <span>{{ sessionCountdown }}</span>
+            </div>
+
+            <!-- Connection status badge -->
+            <div
+              class="flex items-center gap-1.5 border px-2.5 py-1.5 font-display text-xs"
+              :class="
+                isAuthenticated
+                  ? 'border-emerald-500/30 bg-emerald-500/5 text-emerald-400'
+                  : isDemoMode
+                    ? 'border-accent-sky/30 bg-accent-sky/5 text-accent-sky'
+                    : 'border-border-default text-text-dim'
+              "
+            >
+              <Icon
+                :icon="isAuthenticated ? 'lucide:shield-check' : 'lucide:database'"
+                class="size-3.5"
+              />
+              <span>{{ isAuthenticated ? 'Cognito Connected' : 'Demo Mode' }}</span>
+            </div>
+
+            <!-- Logout button — only shown when Cognito session is active -->
+            <button
+              v-if="isAuthenticated"
+              type="button"
+              class="flex items-center gap-1.5 border border-red-500/40 bg-red-500/5 px-2.5 py-1.5 font-display text-xs text-red-400 transition-colors hover:border-red-500/70 hover:bg-red-500/10"
+              title="Logout — clears in-memory session credentials"
+              @click="handleDisconnect"
+            >
+              <Icon icon="lucide:log-out" class="size-3.5" />
+              <span class="hidden sm:inline">Logout</span>
+            </button>
+
+            <!-- Connect button — shown when no active session -->
+            <button
+              v-if="!isAuthenticated"
+              type="button"
+              class="flex items-center gap-1.5 border border-accent-coral bg-accent-coral/10 px-2.5 py-1.5 font-display text-xs font-semibold text-accent-coral transition-colors hover:bg-accent-coral/20"
+              @click="showAuth = true"
+            >
+              <Icon icon="lucide:plug" class="size-3.5" />
+              <span class="hidden sm:inline">{{ hasConfig ? 'Reconnect' : 'Connect AWS' }}</span>
+            </button>
+
+            <!-- Demo mode button — shown when not authenticated and not in demo -->
+            <button
+              v-if="!isAuthenticated && !isDemoMode"
+              type="button"
+              class="flex items-center gap-1.5 border border-accent-sky/50 bg-accent-sky/10 px-2.5 py-1.5 font-display text-xs text-accent-sky transition-colors hover:bg-accent-sky/20"
+              @click="handleDemo"
+            >
+              <Icon icon="lucide:layout-dashboard" class="size-3.5" />
+              <span class="hidden sm:inline">Demo</span>
+            </button>
+
+            <RouterLink
+              to="/"
+              class="flex items-center gap-1.5 border border-border-default bg-bg-elevated px-2.5 py-1.5 font-display text-xs text-text-secondary transition-colors hover:border-accent-coral/50 hover:text-accent-coral"
+            >
+              <Icon icon="lucide:home" class="size-3.5" />
+              <span class="hidden sm:inline">Home</span>
+            </RouterLink>
+          </nav>
+        </div>
+      </div>
+    </header>
+
+    <!-- Main Content -->
+    <main class="mx-auto max-w-7xl px-4 py-8 sm:px-6">
+      <!-- Auth screen — shown when no report yet -->
+      <div v-if="!hasReport && !isLoading">
+        <AwsAuth
+          :saved-config="cognitoConfig"
+          :is-loading="isAuthLoading"
+          :error-message="authError"
+          @connect="handleConnect"
+          @demo="handleDemo"
+        />
+      </div>
+
+      <!-- Initial loading (no report yet) -->
+      <div
+        v-else-if="!hasReport && isLoading"
+        class="flex min-h-[50vh] items-center justify-center"
+      >
+        <div class="flex flex-col items-center gap-4 animate-fade-up">
+          <div
+            class="flex size-16 items-center justify-center border border-accent-coral bg-bg-surface"
+          >
+            <Icon icon="lucide:loader-circle" class="size-8 animate-spin text-accent-coral" />
+          </div>
+          <p class="font-display text-sm text-text-secondary">Fetching cost data…</p>
+        </div>
+      </div>
+
+      <!-- Dashboard — stays mounted across refreshes so filter state is preserved -->
+      <div v-else class="animate-fade-up">
+        <!-- Dashboard header -->
+        <div class="mb-6 flex flex-wrap items-start justify-between gap-4">
+          <div>
+            <h2 class="font-display text-xl font-bold text-text-primary">
+              <span class="text-accent-coral">//</span> Cost Explorer
+            </h2>
+            <p class="mt-1 text-sm text-text-secondary">
+              {{ report?.dateRange.start }} — {{ report?.dateRange.end }} ·
+              <span class="text-text-dim"
+                >{{
+                  report?.granularity.charAt(0) + (report?.granularity.slice(1).toLowerCase() ?? '')
+                }}
+                view</span
+              >
+            </p>
+          </div>
+        </div>
+
+        <!-- Refresh loading indicator — inline banner, keeps CostDashboard mounted -->
+        <div
+          v-if="isLoading"
+          class="mb-4 flex items-center gap-3 border border-accent-coral/30 bg-accent-coral/5 px-4 py-3"
+        >
+          <Icon
+            icon="lucide:loader-circle"
+            class="size-4 shrink-0 animate-spin text-accent-coral"
+          />
+          <p class="font-display text-sm text-text-secondary">Fetching cost data…</p>
+        </div>
+
+        <CostDashboard
+          v-if="report"
+          :report="report"
+          :is-demo-mode="isDemoMode"
+          :has-credentials="isAuthenticated"
+          :error-message="errorMessage"
+          @refresh="handleRefresh"
+          @disconnect="handleDisconnect"
+          @cli-output="handleCliOutput"
+        />
+      </div>
+    </main>
+
+    <!-- Auth modal overlay -->
+    <Teleport to="body">
+      <div
+        v-if="showAuth"
+        class="fixed inset-0 z-50 flex items-center justify-center bg-bg-deep/80 backdrop-blur-sm"
+        @click.self="showAuth = false"
+      >
+        <div class="relative w-full max-w-lg mx-4">
+          <button
+            type="button"
+            class="absolute -top-3 -right-3 z-10 flex size-7 items-center justify-center border border-border-default bg-bg-surface text-text-dim hover:text-text-primary"
+            aria-label="Close"
+            @click="showAuth = false"
+          >
+            <Icon icon="lucide:x" class="size-4" />
+          </button>
+          <AwsAuth
+            :saved-config="cognitoConfig"
+            :is-loading="isAuthLoading"
+            :error-message="authError"
+            @connect="handleConnect"
+            @demo="handleDemo"
+          />
+        </div>
+      </div>
+    </Teleport>
+
+    <!-- Footer -->
+    <footer class="mt-12 border-t border-border-default py-6 text-center">
+      <p class="font-display text-xs text-text-dim">
+        <span class="text-accent-coral">//</span> My AWS Dashboards · Part of
+        <RouterLink to="/" class="text-accent-sky hover:underline">vibe.j2team.org</RouterLink> ·
+        Cognito-authenticated · Credentials kept in memory only · Session expires in 5 min.
+      </p>
+    </footer>
+  </div>
+</template>
diff --git a/src/views/my-aws-dashboards/meta.ts b/src/views/my-aws-dashboards/meta.ts
new file mode 100644
index 00000000..04963522
--- /dev/null
+++ b/src/views/my-aws-dashboards/meta.ts
@@ -0,0 +1,12 @@
+import type { PageMeta } from '@/types/page'
+
+const meta: PageMeta = {
+  name: 'My AWS Dashboards',
+  description:
+    'Monitor and analyze your AWS account costs and resource billing with interactive charts and exportable reports.',
+  author: 'huynguyen260398',
+  facebook: 'https://www.facebook.com/huy.nguyen.682',
+  category: 'tool',
+}
+
+export default meta
diff --git a/src/views/my-aws-dashboards/types.ts b/src/views/my-aws-dashboards/types.ts
new file mode 100644
index 00000000..277c4e29
--- /dev/null
+++ b/src/views/my-aws-dashboards/types.ts
@@ -0,0 +1,168 @@
+/** @deprecated Use CognitoConfig + CognitoSession instead */
+export interface AwsCredentials {
+  accountId: string
+  accessKeyId: string
+  secretAccessKey: string
+  sessionToken: string
+  region: string
+}
+
+/** Non-secret Cognito Identity Pool configuration stored in localStorage */
+export interface CognitoConfig {
+  identityPoolId: string
+  region: string
+  /** ARN of the unauthenticated IAM role attached to the Identity Pool */
+  roleArn: string
+}
+
+/** Temporary credentials obtained from Cognito — stored in memory only, never persisted */
+export interface CognitoSession {
+  accessKeyId: string
+  secretAccessKey: string
+  sessionToken: string
+  identityId: string
+  region: string
+  /** Unix timestamp (ms) at which this app session expires (5 min from login) */
+  expiresAt: number
+}
+
+export type Granularity = 'DAILY' | 'MONTHLY'
+
+export type ChartType = 'bar' | 'line' | 'pie' | 'stacked'
+
+export type SortField = 'service' | 'cost' | 'percentage'
+
+export type SortDir = 'asc' | 'desc'
+
+export interface ServiceCostEntry {
+  service: string
+  cost: number
+  percentage: number
+  unit: string
+}
+
+export interface TimeSeriesPoint {
+  period: string
+  label: string
+  services: Record<string, number>
+  total: number
+}
+
+export interface CostReport {
+  dateRange: { start: string; end: string }
+  granularity: Granularity
+  currency: string
+  totalCost: number
+  previousTotalCost: number
+  timeSeries: TimeSeriesPoint[]
+  serviceBreakdown: ServiceCostEntry[]
+}
+
+// Chart.js types (loaded via CDN)
+export interface ChartDataset {
+  label: string
+  data: number[]
+  backgroundColor?: string | string[]
+  borderColor?: string | string[]
+  borderWidth?: number
+  fill?: boolean
+  tension?: number
+  stack?: string
+  hoverOffset?: number
+}
+
+export interface ChartData {
+  labels: string[]
+  datasets: ChartDataset[]
+}
+
+export interface ChartScaleConfig {
+  stacked?: boolean
+  display?: boolean
+  grid?: { color?: string; display?: boolean }
+  ticks?: {
+    color?: string
+    callback?: (value: number | string) => string
+    maxRotation?: number
+    font?: { family?: string }
+  }
+  border?: { display?: boolean }
+}
+
+export interface ChartTitleConfig {
+  display?: boolean
+  text?: string
+  color?: string
+}
+
+export interface ChartLegendConfig {
+  display?: boolean
+  position?: string
+  labels?: { color?: string; font?: { family?: string }; padding?: number; boxWidth?: number }
+}
+
+export interface ChartTooltipCallbacks {
+  label?: (context: ChartCallbackContext) => string
+  title?: (contexts: ChartCallbackContext[]) => string
+}
+
+export interface ChartConfig {
+  type: string
+  data: ChartData
+  options: {
+    responsive: boolean
+    maintainAspectRatio: boolean
+    animation?: { duration?: number }
+    plugins?: {
+      legend?: ChartLegendConfig
+      tooltip?: {
+        callbacks?: ChartTooltipCallbacks
+        backgroundColor?: string
+        titleColor?: string
+        bodyColor?: string
+        borderColor?: string
+        borderWidth?: number
+      }
+      title?: ChartTitleConfig
+    }
+    scales?: Record<string, ChartScaleConfig>
+    layout?: { padding?: number | { top?: number; bottom?: number; left?: number; right?: number } }
+  }
+}
+
+export interface ChartJsInstance {
+  destroy(): void
+  update(): void
+  data: ChartData
+}
+
+export interface ChartCallbackContext {
+  label: string
+  raw: number
+  dataset: ChartDataset
+  dataIndex: number
+  formattedValue: string
+}
+
+export type ChartJsConstructor = new (
+  canvas: HTMLCanvasElement,
+  config: ChartConfig,
+) => ChartJsInstance
+
+export interface XLSXWorksheet {
+  [key: string]: { v: string | number; t: string } | { '!ref': string }
+}
+
+export interface XLSXWorkbook {
+  SheetNames: string[]
+  Sheets: Record<string, XLSXWorksheet>
+}
+
+export interface XLSXLibrary {
+  utils: {
+    book_new(): XLSXWorkbook
+    book_append_sheet(wb: XLSXWorkbook, ws: XLSXWorksheet, name: string): void
+    aoa_to_sheet(data: (string | number)[][]): XLSXWorksheet
+  }
+  writeFile(wb: XLSXWorkbook, filename: string): void
+}
diff --git a/src/views/my-aws-dashboards/utils/chartUtils.ts b/src/views/my-aws-dashboards/utils/chartUtils.ts
new file mode 100644
index 00000000..bfaefeb5
--- /dev/null
+++ b/src/views/my-aws-dashboards/utils/chartUtils.ts
@@ -0,0 +1,203 @@
+import type { CostReport, ChartConfig, ChartDataset, ChartType } from '../types'
+
+// Chart color palette for data series (distinct, accessible)
+export const CHART_COLORS = [
+  '#FF6B4A', // coral
+  '#FFB830', // amber
+  '#38BDF8', // sky
+  '#A78BFA', // violet
+  '#34D399', // emerald
+  '#F472B6', // pink
+  '#FB923C', // orange
+  '#60A5FA', // blue
+  '#4ADE80', // green
+  '#E879F9', // fuchsia
+] as const
+
+const CHART_GRID_COLOR = 'rgba(37, 53, 73, 0.8)' // border-default
+const CHART_TEXT_COLOR = '#8B9DB5' // text-secondary
+const CHART_BG_COLOR = 'rgba(22, 34, 50, 0.95)' // bg-surface
+const CHART_FONT_FAMILY = "'Anybody', 'Be Vietnam Pro', sans-serif"
+
+function formatUSD(value: number): string {
+  if (value >= 1000) return `$${(value / 1000).toFixed(1)}K`
+  return `$${value.toFixed(2)}`
+}
+
+export function buildChartConfig(report: CostReport, chartType: ChartType): ChartConfig {
+  const { timeSeries, serviceBreakdown } = report
+  const labels = timeSeries.map((p) => p.label)
+  const services = serviceBreakdown.map((s) => s.service)
+
+  const commonOptions = {
+    responsive: true,
+    maintainAspectRatio: false,
+    animation: { duration: 400 },
+    plugins: {
+      legend: {
+        display: true,
+        position: 'bottom' as const,
+        labels: {
+          color: CHART_TEXT_COLOR,
+          font: { family: CHART_FONT_FAMILY },
+          padding: 16,
+          boxWidth: 12,
+        },
+      },
+      tooltip: {
+        backgroundColor: CHART_BG_COLOR,
+        titleColor: '#F0EDE6',
+        bodyColor: CHART_TEXT_COLOR,
+        borderColor: '#253549',
+        borderWidth: 1,
+        callbacks: {
+          label: (ctx: { dataset: { label?: string }; raw: number }) =>
+            ` ${ctx.dataset.label ?? ''}: ${formatUSD(ctx.raw)}`,
+        },
+      },
+    },
+  }
+
+  if (chartType === 'pie') {
+    return {
+      type: 'doughnut',
+      data: {
+        labels: services,
+        datasets: [
+          {
+            label: 'Cost by Service',
+            data: serviceBreakdown.map((s) => s.cost),
+            backgroundColor: CHART_COLORS.slice(0, services.length),
+            borderColor: '#162232',
+            borderWidth: 2,
+            hoverOffset: 8,
+          },
+        ],
+      },
+      options: {
+        ...commonOptions,
+        layout: { padding: 16 },
+        plugins: {
+          ...commonOptions.plugins,
+          tooltip: {
+            ...commonOptions.plugins.tooltip,
+            callbacks: {
+              label: (ctx: { label?: string; raw: number; dataset: { data: number[] } }) => {
+                const total = ctx.dataset.data.reduce((a, b) => a + b, 0)
+                const pct = total > 0 ? ((ctx.raw / total) * 100).toFixed(1) : '0'
+                return ` ${ctx.label ?? ''}: ${formatUSD(ctx.raw)} (${pct}%)`
+              },
+            },
+          },
+        },
+      },
+    }
+  }
+
+  if (chartType === 'line') {
+    const datasets: ChartDataset[] = services.map((svc, i) => ({
+      label: svc,
+      data: timeSeries.map((p) => p.services[svc] ?? 0),
+      backgroundColor: (CHART_COLORS[i % CHART_COLORS.length] ?? '#FF6B4A') + '20',
+      borderColor: CHART_COLORS[i % CHART_COLORS.length] ?? '#FF6B4A',
+      borderWidth: 2,
+      fill: false,
+      tension: 0.4,
+    }))
+
+    return {
+      type: 'line',
+      data: { labels, datasets },
+      options: {
+        ...commonOptions,
+        scales: {
+          x: {
+            grid: { color: CHART_GRID_COLOR },
+            ticks: {
+              color: CHART_TEXT_COLOR,
+              font: { family: CHART_FONT_FAMILY },
+              maxRotation: 45,
+            },
+            border: { display: false },
+          },
+          y: {
+            grid: { color: CHART_GRID_COLOR },
+            ticks: {
+              color: CHART_TEXT_COLOR,
+              callback: (v: number | string) => formatUSD(Number(v)),
+            },
+            border: { display: false },
+          },
+        },
+      },
+    }
+  }
+
+  if (chartType === 'stacked') {
+    const datasets: ChartDataset[] = services.map((svc, i) => ({
+      label: svc,
+      data: timeSeries.map((p) => p.services[svc] ?? 0),
+      backgroundColor: CHART_COLORS[i % CHART_COLORS.length] ?? '#FF6B4A',
+      borderColor: '#162232',
+      borderWidth: 1,
+      stack: 'total',
+    }))
+
+    return {
+      type: 'bar',
+      data: { labels, datasets },
+      options: {
+        ...commonOptions,
+        scales: {
+          x: {
+            stacked: true,
+            grid: { color: CHART_GRID_COLOR },
+            ticks: { color: CHART_TEXT_COLOR, maxRotation: 45 },
+            border: { display: false },
+          },
+          y: {
+            stacked: true,
+            grid: { color: CHART_GRID_COLOR },
+            ticks: {
+              color: CHART_TEXT_COLOR,
+              callback: (v: number | string) => formatUSD(Number(v)),
+            },
+            border: { display: false },
+          },
+        },
+      },
+    }
+  }
+
+  // Default: grouped bar chart
+  const datasets: ChartDataset[] = services.map((svc, i) => ({
+    label: svc,
+    data: timeSeries.map((p) => p.services[svc] ?? 0),
+    backgroundColor: CHART_COLORS[i % CHART_COLORS.length] ?? '#FF6B4A',
+    borderColor: '#162232',
+    borderWidth: 1,
+  }))
+
+  return {
+    type: 'bar',
+    data: { labels, datasets },
+    options: {
+      ...commonOptions,
+      scales: {
+        x: {
+          grid: { display: false },
+          ticks: { color: CHART_TEXT_COLOR, maxRotation: 45 },
+          border: { display: false },
+        },
+        y: {
+          grid: { color: CHART_GRID_COLOR },
+          ticks: {
+            color: CHART_TEXT_COLOR,
+            callback: (v: number | string) => formatUSD(Number(v)),
+          },
+          border: { display: false },
+        },
+      },
+    },
+  }
+}
diff --git a/src/views/my-aws-dashboards/utils/cognitoClient.ts b/src/views/my-aws-dashboards/utils/cognitoClient.ts
new file mode 100644
index 00000000..ac0a24fa
--- /dev/null
+++ b/src/views/my-aws-dashboards/utils/cognitoClient.ts
@@ -0,0 +1,142 @@
+/**
+ * Cognito Identity Pool — Basic Authentication Flow
+ *
+ * Uses the three-step basic flow instead of the enhanced flow because
+ * AWS Cost Explorer (ce:*) is not included in Cognito's enhanced-flow
+ * session policy allow-list and would be blocked with AccessDeniedException.
+ *
+ * Basic flow (no SigV4 signing required for any step):
+ *  1. GetId                    → resolve a stable IdentityId for this browser
+ *  2. GetOpenIdToken            → exchange IdentityId for a short-lived OIDC token
+ *  3. STS AssumeRoleWithWebIdentity → exchange OIDC token for STS credentials
+ *
+ * The STS call uses the unauthenticated IAM role ARN configured on the pool.
+ * This role's trust policy restricts assumption to this specific Identity Pool,
+ * so the role ARN itself is not a secret.
+ */
+
+interface CognitoGetIdResponse {
+  IdentityId: string
+}
+
+interface CognitoGetOpenIdTokenResponse {
+  Token: string
+  IdentityId: string
+}
+
+export interface CognitoTemporaryCredentials {
+  accessKeyId: string
+  secretAccessKey: string
+  sessionToken: string
+  identityId: string
+}
+
+// ─── Cognito helpers ──────────────────────────────────────────────────────────
+
+async function cognitoPost<T>(
+  region: string,
+  target: string,
+  body: Record<string, string>,
+): Promise<T> {
+  const response = await fetch(`https://cognito-identity.${region}.amazonaws.com/`, {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/x-amz-json-1.1',
+      'X-Amz-Target': `AWSCognitoIdentityService.${target}`,
+    },
+    body: JSON.stringify(body),
+    signal: AbortSignal.timeout(15000),
+  })
+
+  if (!response.ok) {
+    let message = `${target} failed (HTTP ${response.status})`
+    try {
+      const err = (await response.json()) as { message?: string; Message?: string; __type?: string }
+      const detail = err.message ?? err.Message
+      const type = err.__type?.split('#').pop()
+      if (type) message = type
+      if (detail) message += `: ${detail}`
+    } catch {
+      // body not parseable — keep generic message
+    }
+    throw new Error(message)
+  }
+
+  return response.json() as Promise<T>
+}
+
+// ─── STS helper ───────────────────────────────────────────────────────────────
+
+function parseXmlText(doc: Document, tag: string): string {
+  return doc.querySelector(tag)?.textContent ?? ''
+}
+
+async function assumeRoleWithWebIdentity(
+  roleArn: string,
+  webIdentityToken: string,
+): Promise<{ accessKeyId: string; secretAccessKey: string; sessionToken: string }> {
+  const params = new URLSearchParams({
+    Action: 'AssumeRoleWithWebIdentity',
+    Version: '2011-06-15',
+    RoleArn: roleArn,
+    RoleSessionName: 'MyAwsDashboard',
+    WebIdentityToken: webIdentityToken,
+    DurationSeconds: '900', // STS minimum; app enforces 5-min logout independently
+  })
+
+  // AssumeRoleWithWebIdentity does not require SigV4 signing — designed for browser/mobile use
+  const response = await fetch('https://sts.amazonaws.com/', {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
+    body: params.toString(),
+    signal: AbortSignal.timeout(15000),
+  })
+
+  const text = await response.text()
+  const doc = new DOMParser().parseFromString(text, 'text/xml')
+
+  if (!response.ok) {
+    const msg =
+      parseXmlText(doc, 'Message') ||
+      parseXmlText(doc, 'message') ||
+      `AssumeRoleWithWebIdentity failed (HTTP ${response.status})`
+    throw new Error(msg)
+  }
+
+  const accessKeyId = parseXmlText(doc, 'AccessKeyId')
+  const secretAccessKey = parseXmlText(doc, 'SecretAccessKey')
+  const sessionToken = parseXmlText(doc, 'SessionToken')
+
+  if (!accessKeyId || !secretAccessKey || !sessionToken) {
+    throw new Error('STS returned an incomplete credentials response.')
+  }
+
+  return { accessKeyId, secretAccessKey, sessionToken }
+}
+
+// ─── Public API ───────────────────────────────────────────────────────────────
+
+/**
+ * Exchange a Cognito Identity Pool ID + unauthenticated IAM role for
+ * temporary AWS credentials using the basic (classic) auth flow.
+ */
+export async function getCognitoCredentials(
+  identityPoolId: string,
+  region: string,
+  roleArn: string,
+): Promise<CognitoTemporaryCredentials> {
+  // Step 1 — resolve a stable IdentityId for this browser
+  const { IdentityId } = await cognitoPost<CognitoGetIdResponse>(region, 'GetId', {
+    IdentityPoolId: identityPoolId,
+  })
+
+  // Step 2 — exchange IdentityId for a short-lived OIDC token
+  const { Token } = await cognitoPost<CognitoGetOpenIdTokenResponse>(region, 'GetOpenIdToken', {
+    IdentityId,
+  })
+
+  // Step 3 — exchange OIDC token for STS credentials (no signing needed)
+  const stsCreds = await assumeRoleWithWebIdentity(roleArn, Token)
+
+  return { ...stsCreds, identityId: IdentityId }
+}
diff --git a/src/views/my-aws-dashboards/utils/demoData.ts b/src/views/my-aws-dashboards/utils/demoData.ts
new file mode 100644
index 00000000..76e7194d
--- /dev/null
+++ b/src/views/my-aws-dashboards/utils/demoData.ts
@@ -0,0 +1,208 @@
+import type { TimeSeriesPoint, ServiceCostEntry, CostReport } from '../types'
+
+export const AWS_REGIONS = [
+  { value: 'us-east-1', label: 'US East (N. Virginia)' },
+  { value: 'us-east-2', label: 'US East (Ohio)' },
+  { value: 'us-west-1', label: 'US West (N. California)' },
+  { value: 'us-west-2', label: 'US West (Oregon)' },
+  { value: 'ap-southeast-1', label: 'Asia Pacific (Singapore)' },
+  { value: 'ap-southeast-2', label: 'Asia Pacific (Sydney)' },
+  { value: 'ap-northeast-1', label: 'Asia Pacific (Tokyo)' },
+  { value: 'ap-south-1', label: 'Asia Pacific (Mumbai)' },
+  { value: 'eu-west-1', label: 'Europe (Ireland)' },
+  { value: 'eu-central-1', label: 'Europe (Frankfurt)' },
+  { value: 'sa-east-1', label: 'South America (São Paulo)' },
+] as const
+
+export const DEMO_SERVICES = [
+  'Amazon EC2',
+  'Amazon RDS',
+  'Amazon S3',
+  'AWS Lambda',
+  'Amazon CloudFront',
+  'Amazon Route 53',
+  'AWS WAF',
+  'Amazon ElastiCache',
+  'AWS Data Transfer',
+  'Amazon SES',
+] as const
+
+// Base monthly costs (USD) per service
+const MONTHLY_BASE: Record<string, number> = {
+  'Amazon EC2': 1234.56,
+  'Amazon RDS': 456.78,
+  'Amazon S3': 89.12,
+  'AWS Lambda': 23.45,
+  'Amazon CloudFront': 67.89,
+  'Amazon Route 53': 5.0,
+  'AWS WAF': 45.0,
+  'Amazon ElastiCache': 234.56,
+  'AWS Data Transfer': 123.45,
+  'Amazon SES': 12.34,
+}
+
+// Growth multipliers per month (simulates organic growth)
+const MONTHLY_GROWTH = [0.82, 0.88, 0.93, 0.97, 1.0, 1.04]
+
+function round2(n: number): number {
+  return Math.round(n * 100) / 100
+}
+
+function addNoise(base: number, seed: number): number {
+  // Deterministic "noise" based on seed so data is stable
+  const noise = (((seed * 9301 + 49297) % 233280) / 233280) * 0.2 - 0.1
+  return round2(base * (1 + noise))
+}
+
+function formatPeriod(year: number, month: number): string {
+  return `${year}-${String(month).padStart(2, '0')}`
+}
+
+function formatPeriodLabel(period: string): string {
+  const [year, month] = period.split('-')
+  const months = [
+    'Jan',
+    'Feb',
+    'Mar',
+    'Apr',
+    'May',
+    'Jun',
+    'Jul',
+    'Aug',
+    'Sep',
+    'Oct',
+    'Nov',
+    'Dec',
+  ]
+  const monthIndex = parseInt(month ?? '1') - 1
+  return `${months[monthIndex] ?? month} ${year}`
+}
+
+function generateMonthlyPeriods(start: string, end: string): string[] {
+  const periods: string[] = []
+  const [sy, sm] = start.split('-').map(Number)
+  const [ey, em] = end.split('-').map(Number)
+
+  if (sy === undefined || sm === undefined || ey === undefined || em === undefined) return periods
+
+  let year = sy
+  let month = sm
+  while (year < ey || (year === ey && month <= em)) {
+    periods.push(formatPeriod(year, month))
+    month++
+    if (month > 12) {
+      month = 1
+      year++
+    }
+  }
+  return periods
+}
+
+function generateDailyPeriods(start: string, end: string): string[] {
+  const periods: string[] = []
+  const startDate = new Date(start + 'T00:00:00')
+  const endDate = new Date(end + 'T00:00:00')
+
+  const curr = new Date(startDate)
+  while (curr <= endDate) {
+    periods.push(curr.toISOString().slice(0, 10))
+    curr.setDate(curr.getDate() + 1)
+  }
+  return periods
+}
+
+export function generateDemoReport(
+  start: string,
+  end: string,
+  granularity: 'DAILY' | 'MONTHLY',
+  selectedServices: string[],
+): CostReport {
+  const services = selectedServices.length > 0 ? selectedServices : [...DEMO_SERVICES]
+
+  // Reference date for growth index
+  const refYear = 2025
+  const refMonth = 11 // November 2025
+
+  let timeSeries: TimeSeriesPoint[]
+
+  if (granularity === 'MONTHLY') {
+    const periods = generateMonthlyPeriods(start.slice(0, 7), end.slice(0, 7))
+    timeSeries = periods.map((period, idx) => {
+      const [year, month] = period.split('-').map(Number)
+      if (year === undefined || month === undefined)
+        return { period, label: period, services: {}, total: 0 }
+
+      const monthsFromRef = (year - refYear) * 12 + (month - refMonth)
+      const growthIdx = Math.min(Math.max(monthsFromRef + 3, 0), MONTHLY_GROWTH.length - 1)
+      const growth = MONTHLY_GROWTH[growthIdx] ?? 1.0
+
+      const servicesMap: Record<string, number> = {}
+      let total = 0
+      services.forEach((svc, svcIdx) => {
+        const base = (MONTHLY_BASE[svc] ?? 10) * growth
+        const cost = addNoise(base, idx * 13 + svcIdx * 7)
+        servicesMap[svc] = cost
+        total += cost
+      })
+
+      return {
+        period,
+        label: formatPeriodLabel(period),
+        services: servicesMap,
+        total: round2(total),
+      }
+    })
+  } else {
+    const periods = generateDailyPeriods(start, end)
+    timeSeries = periods.map((period, idx) => {
+      const date = new Date(period + 'T00:00:00')
+      const year = date.getFullYear()
+      const month = date.getMonth() + 1
+      const monthsFromRef = (year - refYear) * 12 + (month - refMonth)
+      const growthIdx = Math.min(Math.max(monthsFromRef + 3, 0), MONTHLY_GROWTH.length - 1)
+      const growth = MONTHLY_GROWTH[growthIdx] ?? 1.0
+
+      const servicesMap: Record<string, number> = {}
+      let total = 0
+      services.forEach((svc, svcIdx) => {
+        const dailyBase = ((MONTHLY_BASE[svc] ?? 10) / 30) * growth
+        const cost = addNoise(dailyBase, idx * 13 + svcIdx * 7)
+        servicesMap[svc] = cost
+        total += cost
+      })
+
+      return { period, label: period, services: servicesMap, total: round2(total) }
+    })
+  }
+
+  const totalCost = round2(timeSeries.reduce((s, p) => s + p.total, 0))
+
+  // Calculate previous period total (same length, shifted back)
+  const periodCount = timeSeries.length
+  const prevTimeSeries = [...timeSeries].slice(0, Math.ceil(periodCount / 2))
+  const previousTotalCost = round2(prevTimeSeries.reduce((s, p) => s + p.total, 0) * 0.95)
+
+  // Service breakdown
+  const serviceBreakdown: ServiceCostEntry[] = services
+    .map((svc) => ({
+      service: svc,
+      cost: round2(timeSeries.reduce((s, p) => s + (p.services[svc] ?? 0), 0)),
+      percentage: 0,
+      unit: 'USD',
+    }))
+    .map((entry) => ({
+      ...entry,
+      percentage: totalCost > 0 ? round2((entry.cost / totalCost) * 100) : 0,
+    }))
+    .sort((a, b) => b.cost - a.cost)
+
+  return {
+    dateRange: { start, end },
+    granularity,
+    currency: 'USD',
+    totalCost,
+    previousTotalCost,
+    timeSeries,
+    serviceBreakdown,
+  }
+}
diff --git a/src/views/my-aws-dashboards/utils/exportUtils.ts b/src/views/my-aws-dashboards/utils/exportUtils.ts
new file mode 100644
index 00000000..80fda4f9
--- /dev/null
+++ b/src/views/my-aws-dashboards/utils/exportUtils.ts
@@ -0,0 +1,106 @@
+import type { CostReport, XLSXLibrary } from '../types'
+
+function formatUSD(value: number): string {
+  return `$${value.toFixed(2)}`
+}
+
+function csvEscape(value: string | number): string {
+  const str = String(value)
+  if (str.includes(',') || str.includes('"') || str.includes('\n')) {
+    return `"${str.replace(/"/g, '""')}"`
+  }
+  return str
+}
+
+function buildCsvRows(report: CostReport): (string | number)[][] {
+  const { timeSeries, serviceBreakdown, dateRange, granularity, totalCost, currency } = report
+  const services = serviceBreakdown.map((s) => s.service)
+
+  const rows: (string | number)[][] = []
+
+  // Header metadata
+  rows.push(['AWS Cost Report'])
+  rows.push(['Date Range', `${dateRange.start} to ${dateRange.end}`])
+  rows.push(['Granularity', granularity])
+  rows.push(['Total Cost', formatUSD(totalCost)])
+  rows.push(['Currency', currency])
+  rows.push([])
+
+  // Time series section
+  rows.push(['Cost Over Time'])
+  rows.push(['Period', ...services, 'Total'])
+  timeSeries.forEach((point) => {
+    const row: (string | number)[] = [point.label]
+    services.forEach((svc) => row.push(point.services[svc] ?? 0))
+    row.push(point.total)
+    rows.push(row)
+  })
+
+  rows.push([])
+
+  // Service breakdown section
+  rows.push(['Service Breakdown'])
+  rows.push(['Service', 'Total Cost (USD)', 'Percentage (%)'])
+  serviceBreakdown.forEach((entry) => {
+    rows.push([entry.service, entry.cost, `${entry.percentage}%`])
+  })
+
+  return rows
+}
+
+export function downloadCsv(report: CostReport): void {
+  const rows = buildCsvRows(report)
+  const csv = rows.map((row) => row.map((cell) => csvEscape(cell)).join(',')).join('\n')
+
+  const blob = new Blob(['\ufeff' + csv], { type: 'text/csv;charset=utf-8;' })
+  const url = URL.createObjectURL(blob)
+  const link = document.createElement('a')
+  link.href = url
+  link.download = `aws-cost-report-${report.dateRange.start}-to-${report.dateRange.end}.csv`
+  document.body.appendChild(link)
+  link.click()
+  document.body.removeChild(link)
+  URL.revokeObjectURL(url)
+}
+
+export async function downloadXlsx(report: CostReport, xlsxLib: XLSXLibrary): Promise<void> {
+  const { timeSeries, serviceBreakdown, dateRange, granularity, totalCost, currency } = report
+  const services = serviceBreakdown.map((s) => s.service)
+
+  // Summary sheet
+  const summaryData: (string | number)[][] = [
+    ['AWS Cost Report'],
+    ['Date Range', `${dateRange.start} to ${dateRange.end}`],
+    ['Granularity', granularity],
+    ['Total Cost', totalCost],
+    ['Currency', currency],
+  ]
+
+  // Time series sheet
+  const timeSeriesData: (string | number)[][] = [
+    ['Period', ...services, 'Total'],
+    ...timeSeries.map((point) => {
+      const row: (string | number)[] = [point.label]
+      services.forEach((svc) => row.push(point.services[svc] ?? 0))
+      row.push(point.total)
+      return row
+    }),
+  ]
+
+  // Service breakdown sheet
+  const breakdownData: (string | number)[][] = [
+    ['Service', 'Total Cost (USD)', 'Percentage (%)'],
+    ...serviceBreakdown.map((entry) => [entry.service, entry.cost, entry.percentage]),
+  ]
+
+  const wb = xlsxLib.utils.book_new()
+  xlsxLib.utils.book_append_sheet(wb, xlsxLib.utils.aoa_to_sheet(summaryData), 'Summary')
+  xlsxLib.utils.book_append_sheet(wb, xlsxLib.utils.aoa_to_sheet(timeSeriesData), 'Cost Over Time')
+  xlsxLib.utils.book_append_sheet(
+    wb,
+    xlsxLib.utils.aoa_to_sheet(breakdownData),
+    'Service Breakdown',
+  )
+
+  xlsxLib.writeFile(wb, `aws-cost-report-${dateRange.start}-to-${dateRange.end}.xlsx`)
+}
diff --git a/src/views/my-aws-dashboards/utils/sigv4.ts b/src/views/my-aws-dashboards/utils/sigv4.ts
new file mode 100644
index 00000000..b0e9352c
--- /dev/null
+++ b/src/views/my-aws-dashboards/utils/sigv4.ts
@@ -0,0 +1,141 @@
+/**
+ * AWS Signature Version 4 (SigV4) signing for browser fetch requests.
+ * Uses the Web Crypto API (SubtleCrypto) — no external dependencies required.
+ */
+
+async function sha256Hex(message: string): Promise<string> {
+  const data = new TextEncoder().encode(message)
+  const hashBuffer = await crypto.subtle.digest('SHA-256', data)
+  return Array.from(new Uint8Array(hashBuffer))
+    .map((b) => b.toString(16).padStart(2, '0'))
+    .join('')
+}
+
+async function hmacSha256(key: BufferSource, message: string): Promise<ArrayBuffer> {
+  const cryptoKey = await crypto.subtle.importKey(
+    'raw',
+    key,
+    { name: 'HMAC', hash: 'SHA-256' },
+    false,
+    ['sign'],
+  )
+  return crypto.subtle.sign('HMAC', cryptoKey, new TextEncoder().encode(message))
+}
+
+function toHex(buf: ArrayBuffer): string {
+  return Array.from(new Uint8Array(buf))
+    .map((b) => b.toString(16).padStart(2, '0'))
+    .join('')
+}
+
+function getAmzDate(date: Date): string {
+  // Format: YYYYMMDDTHHMMSSZ
+  return (
+    date
+      .toISOString()
+      .replace(/[:-]|\.\d{3}/g, '')
+      .slice(0, 15) + 'Z'
+  )
+}
+
+function getDateStamp(date: Date): string {
+  // Format: YYYYMMDD
+  return date.toISOString().slice(0, 10).replace(/-/g, '')
+}
+
+export interface SigV4Params {
+  accessKeyId: string
+  secretAccessKey: string
+  sessionToken?: string
+  region: string
+  service: string
+  host: string
+  method: string
+  /** URL path, e.g. "/" */
+  path: string
+  body: string
+  /** e.g. "AWSInsightsIndexService.GetCostAndUsage" */
+  amzTarget: string
+  contentType: string
+}
+
+/**
+ * Returns signed headers to attach to the fetch request.
+ * The caller should spread these into the `headers` option of fetch().
+ */
+export async function signRequest(params: SigV4Params): Promise<Record<string, string>> {
+  const {
+    accessKeyId,
+    secretAccessKey,
+    sessionToken,
+    region,
+    service,
+    host,
+    method,
+    path,
+    body,
+    amzTarget,
+    contentType,
+  } = params
+
+  const now = new Date()
+  const amzDate = getAmzDate(now)
+  const dateStamp = getDateStamp(now)
+  const credentialScope = `${dateStamp}/${region}/${service}/aws4_request`
+
+  // Canonical headers — must be sorted alphabetically by header name
+  const rawHeaders: [string, string][] = [
+    ['content-type', contentType],
+    ['host', host],
+    ['x-amz-date', amzDate],
+    ['x-amz-target', amzTarget],
+  ]
+  if (sessionToken) rawHeaders.push(['x-amz-security-token', sessionToken])
+  rawHeaders.sort(([a], [b]) => a.localeCompare(b))
+
+  const canonicalHeaders = rawHeaders.map(([k, v]) => `${k}:${v}`).join('\n') + '\n'
+  const signedHeaders = rawHeaders.map(([k]) => k).join(';')
+
+  const payloadHash = await sha256Hex(body)
+
+  const canonicalRequest = [
+    method.toUpperCase(),
+    path,
+    '', // canonical query string (empty for POST)
+    canonicalHeaders,
+    signedHeaders,
+    payloadHash,
+  ].join('\n')
+
+  const hashedCanonicalRequest = await sha256Hex(canonicalRequest)
+
+  const stringToSign = ['AWS4-HMAC-SHA256', amzDate, credentialScope, hashedCanonicalRequest].join(
+    '\n',
+  )
+
+  // Derive signing key
+  const kSecret = new TextEncoder().encode('AWS4' + secretAccessKey)
+  const kDate = await hmacSha256(kSecret, dateStamp)
+  const kRegion = await hmacSha256(kDate, region)
+  const kService = await hmacSha256(kRegion, service)
+  const kSigning = await hmacSha256(kService, 'aws4_request')
+
+  const signatureHex = toHex(await hmacSha256(kSigning, stringToSign))
+
+  const authorization = [
+    `AWS4-HMAC-SHA256 Credential=${accessKeyId}/${credentialScope}`,
+    `SignedHeaders=${signedHeaders}`,
+    `Signature=${signatureHex}`,
+  ].join(', ')
+
+  const result: Record<string, string> = {
+    'Content-Type': contentType,
+    'X-Amz-Date': amzDate,
+    'X-Amz-Target': amzTarget,
+    Authorization: authorization,
+  }
+
+  if (sessionToken) result['X-Amz-Security-Token'] = sessionToken
+
+  return result
+}