diff --git a/apps/machine/src/App.vue b/apps/machine/src/App.vue
index b353984..b089610 100644
--- a/apps/machine/src/App.vue
+++ b/apps/machine/src/App.vue
@@ -2,13 +2,14 @@
 import { onMounted, onUnmounted, ref, computed } from 'vue'
 import { useAtmStore } from '@/stores/atm'
 import { useTheme } from '@/composables/useTheme'
+import { Sun, Moon } from 'lucide-vue-next'
 import { Badge } from '@/components/ui/badge'
 import { Button } from '@/components/ui/button'
 
 const atmStore = useAtmStore()
 const { current: currentTheme, themes, colorMode } = useTheme()
 const debugExpanded = ref(false)
-const network = import.meta.env.VITE_NETWORK || 'regtest'
+// Network detected dynamically from Lightning invoice prefix
 const isElectron = typeof window !== 'undefined' && window.electronAPI !== undefined
 
 function formatSats(sats: number): string {
@@ -76,8 +77,8 @@ function toggleLiveServices() {
         <line x1="12" y1="9" x2="12" y2="13" />
         <line x1="12" y1="17" x2="12.01" y2="17" />
       </svg>
-      <h1 class="text-3xl font-bold">ATM Unavailable</h1>
-      <p class="max-w-md text-center text-lg text-muted-foreground">
+      <h1 class="text-[3.5rem] font-bold">ATM Unavailable</h1>
+      <p class="max-w-md text-center text-2xl text-muted-foreground">
         This machine is temporarily out of service. Please try again later or use another machine.
       </p>
       <p v-if="atmStore.debugMode" class="max-w-lg text-center font-mono text-sm text-destructive">
@@ -89,18 +90,16 @@ function toggleLiveServices() {
       <router-view />
 
       <!-- Connection status + balance (top right) -->
-      <div
-        class="fixed right-2 top-2 z-50 flex flex-wrap items-center justify-end gap-1 sm:right-4 sm:top-4 sm:gap-2"
-      >
+      <div class="fixed right-6 top-6 z-50 flex flex-wrap items-center justify-end gap-2">
         <Badge
           v-if="formattedBtcPrice"
-          class="bg-primary/10 font-mono text-primary border border-primary/30 text-xs sm:text-sm"
+          class="bg-primary/10 font-mono text-primary border border-primary/30 text-base"
         >
           {{ formattedBtcPrice }}
         </Badge>
         <Badge
           v-if="atmStore.balanceSats !== null"
-          class="bg-bitcoin/20 font-mono text-bitcoin border border-bitcoin/30 text-xs sm:text-sm"
+          class="bg-bitcoin/20 font-mono text-bitcoin border border-bitcoin/30 text-base"
         >
           bal: {{ formatSats(atmStore.balanceSats) }} sats
         </Badge>
@@ -121,13 +120,25 @@ function toggleLiveServices() {
         </Badge>
         <Badge v-else class="bg-muted text-muted-foreground">Mock</Badge>
         <Badge
-          v-if="network !== 'mainnet'"
+          v-if="atmStore.network && atmStore.network !== 'mainnet'"
           class="bg-warning/20 text-warning border border-warning/30"
         >
-          {{ network }}
+          {{ atmStore.network }}
         </Badge>
       </div>
 
+      <!-- Light/dark toggle (always visible) -->
+      <Button
+        variant="outline"
+        size="kiosk"
+        class="fixed bottom-6 right-6 z-50 gap-3"
+        @click="colorMode = colorMode === 'dark' ? 'light' : 'dark'"
+      >
+        <Sun v-if="colorMode === 'dark'" :size="28" />
+        <Moon v-else :size="28" />
+        {{ colorMode === 'dark' ? 'Light' : 'Dark' }}
+      </Button>
+
       <!-- Debug overlay (dev only) -->
       <div
         v-if="atmStore.debugMode"
diff --git a/apps/machine/src/stores/atm.ts b/apps/machine/src/stores/atm.ts
index 0943262..2232336 100644
--- a/apps/machine/src/stores/atm.ts
+++ b/apps/machine/src/stores/atm.ts
@@ -151,12 +151,28 @@ export const useAtmStore = defineStore('atm', () => {
   const balanceSats = ref<number | null>(null)
   const btcPrice = ref<number | null>(null) // local fiat per BTC (for display)
   const btcPriceUsd = ref<number | null>(null) // USD per BTC (always shown)
+  const network = ref<'mainnet' | 'testnet' | 'regtest' | null>(
+    (localStorage.getItem('atm-network') as 'mainnet' | 'testnet' | 'regtest') || null
+  )
   let stopBalanceWatch: (() => void) | null = null
   let pricePollingInterval: ReturnType<typeof setInterval> | null = null
 
   // Store reference to ATM services for direct calls
   let atmServicesRef: ATMServices | null = null
 
+  /** Detect Bitcoin network from a BOLT-11 invoice prefix (called once, persisted) */
+  function detectNetworkFromInvoice(invoice: string) {
+    if (network.value) return // already detected
+    const lower = invoice.toLowerCase()
+    if (lower.startsWith('lnbcrt')) network.value = 'regtest'
+    else if (lower.startsWith('lntb')) network.value = 'testnet'
+    else if (lower.startsWith('lnbc')) network.value = 'mainnet'
+    if (network.value) {
+      localStorage.setItem('atm-network', network.value)
+      console.log('[ATM] Detected network:', network.value)
+    }
+  }
+
   // Computed
   const currentState = computed(() => {
     if (!snapshot.value) return 'uninitialized'
@@ -220,6 +236,11 @@ export const useAtmStore = defineStore('atm', () => {
         if ('cashOut' in state) currentNested = state.cashOut as string
       }
 
+      // Detect network from first invoice we see
+      if (newSnapshot.context.invoice) {
+        detectNetworkFromInvoice(newSnapshot.context.invoice)
+      }
+
       // Auto-advance past waitingForCashTaken when HAL is connected,
       // because HAL's dispenseCash already calls waitForBillsRemoved()
       if (
@@ -394,6 +415,7 @@ export const useAtmStore = defineStore('atm', () => {
     paymentError.value = null
 
     try {
+      detectNetworkFromInvoice(invoice)
       console.log(
         '[ATM] Paying invoice:',
         invoice.slice(0, 40) + '...',
@@ -999,6 +1021,7 @@ export const useAtmStore = defineStore('atm', () => {
     balanceSats,
     btcPrice,
     btcPriceUsd,
+    network,
     halServices,
     isPayingInvoice,
     isRequestingDebit,