feat(machine): add 6 switchable color themes

Add theme system with Gruvbox (default), Catppuccin, Dracula, Nord,
Tokyo Night, and Cyberpunk palettes — each with light/dark variants.
Theme picker on idle screen and debug overlay, persisted to localStorage.

Also fixes @custom-variant dark to use :where() per Tailwind v4 best
practice, and replaces Buy Bitcoin emoji with BitcoinIcon component.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/machine/src/App.vue

@@ -1,10 +1,12 @@
 <script setup lang="ts">
 import { onMounted } from 'vue'
 import { useAtmStore } from '@/stores/atm'
+import { useTheme } from '@/composables/useTheme'
 import { Badge } from '@/components/ui/badge'
 import { Button } from '@/components/ui/button'
 
 const atmStore = useAtmStore()
+const { current: currentTheme, themes } = useTheme()
 
 function formatSats(sats: number): string {
   return sats.toLocaleString()
@@ -68,6 +70,19 @@ function toggleLiveServices() {
         <Button variant="outline" size="sm" class="h-6 text-xs" @click="toggleLiveServices">
           {{ atmStore.useLiveServices ? 'Switch to Mock' : 'Connect Live' }}
         </Button>
+        <span class="text-muted-foreground">|</span>
+        <div class="flex items-center gap-1">
+          <Button
+            v-for="theme in themes"
+            :key="theme.id"
+            :variant="currentTheme === theme.id ? 'default' : 'outline'"
+            size="sm"
+            class="h-6 text-xs"
+            @click="currentTheme = theme.id"
+          >
+            {{ theme.label }}
+          </Button>
+        </div>
       </div>
       <pre class="text-muted-foreground">{{ JSON.stringify(atmStore.context, null, 2) }}</pre>
     </div>

apps/machine/src/composables/useTheme.ts

@@ -0,0 +1,62 @@
+import { ref, watch } from 'vue'
+
+export type ThemeId = 'gruvbox' | 'catppuccin' | 'cyberpunk' | 'dracula' | 'nord' | 'tokyo-night'
+
+export interface ThemeOption {
+  id: ThemeId
+  label: string
+}
+
+export const themes: ThemeOption[] = [
+  { id: 'gruvbox', label: 'Gruvbox' },
+  { id: 'catppuccin', label: 'Catppuccin' },
+  { id: 'dracula', label: 'Dracula' },
+  { id: 'nord', label: 'Nord' },
+  { id: 'tokyo-night', label: 'Tokyo Night' },
+  { id: 'cyberpunk', label: 'Cyberpunk' },
+]
+
+const STORAGE_KEY = 'lamassu-theme'
+
+const current = ref<ThemeId>(loadTheme())
+
+function loadTheme(): ThemeId {
+  try {
+    const stored = localStorage.getItem(STORAGE_KEY)
+    if (stored && themes.some((t) => t.id === stored)) {
+      return stored as ThemeId
+    }
+  } catch {
+    // localStorage unavailable (e.g. SSR)
+  }
+  return 'gruvbox'
+}
+
+function applyTheme(id: ThemeId) {
+  const el = document.documentElement
+  if (id === 'gruvbox') {
+    el.removeAttribute('data-theme')
+  } else {
+    el.setAttribute('data-theme', id)
+  }
+}
+
+// Apply on load
+applyTheme(current.value)
+
+// Persist and apply on change
+watch(current, (id) => {
+  applyTheme(id)
+  try {
+    localStorage.setItem(STORAGE_KEY, id)
+  } catch {
+    // localStorage unavailable
+  }
+})
+
+export function useTheme() {
+  return {
+    current,
+    themes,
+  }
+}

apps/machine/src/style.css

@@ -1,7 +1,7 @@
 @import 'tailwindcss';
 @import 'tw-animate-css';
 
-@custom-variant dark (&:is(.dark *));
+@custom-variant dark (&:where(.dark, .dark *));
 
 @theme inline {
   --radius-sm: calc(var(--radius) - 4px);
@@ -113,6 +113,361 @@
   --qr-foreground: #3c3836; /* gruvbox fg - maintains contrast */
 }
 
+/*
+ * Catppuccin Palette
+ * https://github.com/catppuccin/catppuccin
+ */
+
+[data-theme='catppuccin'] {
+  --radius: 0.625rem;
+
+  /* Catppuccin Latte (light) */
+  --background: #eff1f5; /* base */
+  --foreground: #4c4f69; /* text */
+  --card: #e6e9ef; /* mantle */
+  --card-foreground: #4c4f69;
+  --popover: #e6e9ef;
+  --popover-foreground: #4c4f69;
+  --primary: #8839ef; /* mauve */
+  --primary-foreground: #eff1f5;
+  --secondary: #ccd0da; /* surface0 */
+  --secondary-foreground: #4c4f69;
+  --muted: #ccd0da;
+  --muted-foreground: #6c6f85; /* subtext0 */
+  --accent: #1e66f5; /* blue */
+  --accent-foreground: #eff1f5;
+  --destructive: #d20f39; /* red */
+  --border: #bcc0cc; /* surface1 */
+  --input: #bcc0cc;
+  --ring: #8839ef;
+
+  --success: #40a02b; /* green */
+  --success-foreground: #eff1f5;
+  --warning: #df8e1d; /* yellow */
+  --warning-foreground: #4c4f69;
+  --bitcoin: #fe640b; /* peach */
+  --bitcoin-foreground: #eff1f5;
+
+  --qr: #eff1f5;
+  --qr-foreground: #4c4f69;
+}
+
+[data-theme='catppuccin'].dark {
+  /* Catppuccin Mocha (dark) */
+  --background: #1e1e2e; /* base */
+  --foreground: #cdd6f4; /* text */
+  --card: #181825; /* mantle */
+  --card-foreground: #cdd6f4;
+  --popover: #181825;
+  --popover-foreground: #cdd6f4;
+  --primary: #cba6f7; /* mauve */
+  --primary-foreground: #1e1e2e;
+  --secondary: #313244; /* surface0 */
+  --secondary-foreground: #cdd6f4;
+  --muted: #313244;
+  --muted-foreground: #a6adc8; /* subtext0 */
+  --accent: #89b4fa; /* blue */
+  --accent-foreground: #1e1e2e;
+  --destructive: #f38ba8; /* red */
+  --border: #45475a; /* surface1 */
+  --input: #45475a;
+  --ring: #cba6f7;
+
+  --success: #a6e3a1; /* green */
+  --success-foreground: #1e1e2e;
+  --warning: #f9e2af; /* yellow */
+  --warning-foreground: #1e1e2e;
+  --bitcoin: #fab387; /* peach */
+  --bitcoin-foreground: #1e1e2e;
+
+  --qr: #eff1f5;
+  --qr-foreground: #1e1e2e;
+}
+
+/*
+ * Cyberpunk Palette
+ * Neon accents on deep dark backgrounds
+ */
+
+[data-theme='cyberpunk'] {
+  --radius: 0.375rem;
+
+  /* Cyberpunk Light (corporate dystopia) */
+  --background: #f0f0f8;
+  --foreground: #1a1a2e;
+  --card: #e4e4f0;
+  --card-foreground: #1a1a2e;
+  --popover: #e4e4f0;
+  --popover-foreground: #1a1a2e;
+  --primary: #d6006e; /* magenta */
+  --primary-foreground: #f0f0f8;
+  --secondary: #d0d0e0;
+  --secondary-foreground: #1a1a2e;
+  --muted: #d0d0e0;
+  --muted-foreground: #6b6b8a;
+  --accent: #0099b3; /* teal */
+  --accent-foreground: #f0f0f8;
+  --destructive: #cc0033;
+  --border: #b8b8d0;
+  --input: #b8b8d0;
+  --ring: #d6006e;
+
+  --success: #00b359;
+  --success-foreground: #f0f0f8;
+  --warning: #cc9900;
+  --warning-foreground: #1a1a2e;
+  --bitcoin: #f7931a;
+  --bitcoin-foreground: #f0f0f8;
+
+  --qr: #f0f0f8;
+  --qr-foreground: #1a1a2e;
+}
+
+[data-theme='cyberpunk'].dark {
+  /* Cyberpunk Dark (neon noir) */
+  --background: #0a0a0f;
+  --foreground: #e0e0ff;
+  --card: #12121f;
+  --card-foreground: #e0e0ff;
+  --popover: #12121f;
+  --popover-foreground: #e0e0ff;
+  --primary: #ff2a6d; /* neon magenta */
+  --primary-foreground: #0a0a0f;
+  --secondary: #1a1a2e;
+  --secondary-foreground: #e0e0ff;
+  --muted: #1a1a2e;
+  --muted-foreground: #6b6b8a;
+  --accent: #05d9e8; /* neon cyan */
+  --accent-foreground: #0a0a0f;
+  --destructive: #ff0040;
+  --border: #2a2a4a;
+  --input: #2a2a4a;
+  --ring: #ff2a6d;
+
+  --success: #01ff70; /* neon green */
+  --success-foreground: #0a0a0f;
+  --warning: #ffdd00; /* neon yellow */
+  --warning-foreground: #0a0a0f;
+  --bitcoin: #f7931a;
+  --bitcoin-foreground: #0a0a0f;
+
+  --qr: #e0e0ff;
+  --qr-foreground: #0a0a0f;
+}
+
+/*
+ * Dracula Palette
+ * https://draculatheme.com
+ */
+
+[data-theme='dracula'] {
+  --radius: 0.625rem;
+
+  /* Dracula Light (adapted) */
+  --background: #f8f8f2;
+  --foreground: #282a36;
+  --card: #e8e8e2;
+  --card-foreground: #282a36;
+  --popover: #e8e8e2;
+  --popover-foreground: #282a36;
+  --primary: #7c3aed; /* purple */
+  --primary-foreground: #f8f8f2;
+  --secondary: #d8d8d2;
+  --secondary-foreground: #282a36;
+  --muted: #d8d8d2;
+  --muted-foreground: #6272a4; /* comment */
+  --accent: #0891b2; /* cyan */
+  --accent-foreground: #f8f8f2;
+  --destructive: #dc2626;
+  --border: #c8c8c2;
+  --input: #c8c8c2;
+  --ring: #7c3aed;
+
+  --success: #16a34a;
+  --success-foreground: #f8f8f2;
+  --warning: #ca8a04;
+  --warning-foreground: #282a36;
+  --bitcoin: #ea580c;
+  --bitcoin-foreground: #f8f8f2;
+
+  --qr: #f8f8f2;
+  --qr-foreground: #282a36;
+}
+
+[data-theme='dracula'].dark {
+  /* Dracula Dark */
+  --background: #282a36; /* background */
+  --foreground: #f8f8f2; /* foreground */
+  --card: #44475a; /* current line */
+  --card-foreground: #f8f8f2;
+  --popover: #44475a;
+  --popover-foreground: #f8f8f2;
+  --primary: #bd93f9; /* purple */
+  --primary-foreground: #282a36;
+  --secondary: #44475a;
+  --secondary-foreground: #f8f8f2;
+  --muted: #44475a;
+  --muted-foreground: #6272a4; /* comment */
+  --accent: #8be9fd; /* cyan */
+  --accent-foreground: #282a36;
+  --destructive: #ff5555; /* red */
+  --border: #6272a4;
+  --input: #6272a4;
+  --ring: #bd93f9;
+
+  --success: #50fa7b; /* green */
+  --success-foreground: #282a36;
+  --warning: #f1fa8c; /* yellow */
+  --warning-foreground: #282a36;
+  --bitcoin: #ffb86c; /* orange */
+  --bitcoin-foreground: #282a36;
+
+  --qr: #f8f8f2;
+  --qr-foreground: #282a36;
+}
+
+/*
+ * Nord Palette
+ * https://www.nordtheme.com
+ */
+
+[data-theme='nord'] {
+  --radius: 0.5rem;
+
+  /* Nord Light (Snow Storm) */
+  --background: #eceff4; /* snow storm 3 */
+  --foreground: #2e3440; /* polar night 1 */
+  --card: #e5e9f0; /* snow storm 2 */
+  --card-foreground: #2e3440;
+  --popover: #e5e9f0;
+  --popover-foreground: #2e3440;
+  --primary: #5e81ac; /* frost 4 */
+  --primary-foreground: #eceff4;
+  --secondary: #d8dee9; /* snow storm 1 */
+  --secondary-foreground: #2e3440;
+  --muted: #d8dee9;
+  --muted-foreground: #4c566a; /* polar night 4 */
+  --accent: #88c0d0; /* frost 2 */
+  --accent-foreground: #2e3440;
+  --destructive: #bf616a; /* aurora red */
+  --border: #d8dee9;
+  --input: #d8dee9;
+  --ring: #5e81ac;
+
+  --success: #a3be8c; /* aurora green */
+  --success-foreground: #2e3440;
+  --warning: #ebcb8b; /* aurora yellow */
+  --warning-foreground: #2e3440;
+  --bitcoin: #d08770; /* aurora orange */
+  --bitcoin-foreground: #eceff4;
+
+  --qr: #eceff4;
+  --qr-foreground: #2e3440;
+}
+
+[data-theme='nord'].dark {
+  /* Nord Dark (Polar Night) */
+  --background: #2e3440; /* polar night 1 */
+  --foreground: #eceff4; /* snow storm 3 */
+  --card: #3b4252; /* polar night 2 */
+  --card-foreground: #eceff4;
+  --popover: #3b4252;
+  --popover-foreground: #eceff4;
+  --primary: #88c0d0; /* frost 2 */
+  --primary-foreground: #2e3440;
+  --secondary: #434c5e; /* polar night 3 */
+  --secondary-foreground: #eceff4;
+  --muted: #434c5e;
+  --muted-foreground: #d8dee9; /* snow storm 1 */
+  --accent: #81a1c1; /* frost 3 */
+  --accent-foreground: #2e3440;
+  --destructive: #bf616a; /* aurora red */
+  --border: #434c5e;
+  --input: #434c5e;
+  --ring: #88c0d0;
+
+  --success: #a3be8c; /* aurora green */
+  --success-foreground: #2e3440;
+  --warning: #ebcb8b; /* aurora yellow */
+  --warning-foreground: #2e3440;
+  --bitcoin: #d08770; /* aurora orange */
+  --bitcoin-foreground: #2e3440;
+
+  --qr: #eceff4;
+  --qr-foreground: #2e3440;
+}
+
+/*
+ * Tokyo Night Palette
+ * https://github.com/enkia/tokyo-night-vscode-theme
+ */
+
+[data-theme='tokyo-night'] {
+  --radius: 0.5rem;
+
+  /* Tokyo Night Day (light) */
+  --background: #e1e2e7; /* bg */
+  --foreground: #3760bf; /* fg */
+  --card: #d5d6db;
+  --card-foreground: #3760bf;
+  --popover: #d5d6db;
+  --popover-foreground: #3760bf;
+  --primary: #9854f1; /* magenta */
+  --primary-foreground: #e1e2e7;
+  --secondary: #c4c5ca;
+  --secondary-foreground: #3760bf;
+  --muted: #c4c5ca;
+  --muted-foreground: #848cb5; /* comment */
+  --accent: #2e7de9; /* blue */
+  --accent-foreground: #e1e2e7;
+  --destructive: #f52a65; /* red */
+  --border: #b4b5ba;
+  --input: #b4b5ba;
+  --ring: #9854f1;
+
+  --success: #587539; /* green */
+  --success-foreground: #e1e2e7;
+  --warning: #8c6c3e; /* yellow */
+  --warning-foreground: #e1e2e7;
+  --bitcoin: #b15c00; /* orange */
+  --bitcoin-foreground: #e1e2e7;
+
+  --qr: #e1e2e7;
+  --qr-foreground: #3760bf;
+}
+
+[data-theme='tokyo-night'].dark {
+  /* Tokyo Night Storm (dark) */
+  --background: #1a1b26; /* bg */
+  --foreground: #c0caf5; /* fg */
+  --card: #24283b; /* bg_highlight */
+  --card-foreground: #c0caf5;
+  --popover: #24283b;
+  --popover-foreground: #c0caf5;
+  --primary: #bb9af7; /* magenta */
+  --primary-foreground: #1a1b26;
+  --secondary: #292e42;
+  --secondary-foreground: #c0caf5;
+  --muted: #292e42;
+  --muted-foreground: #565f89; /* comment */
+  --accent: #7aa2f7; /* blue */
+  --accent-foreground: #1a1b26;
+  --destructive: #f7768e; /* red */
+  --border: #3b4261;
+  --input: #3b4261;
+  --ring: #bb9af7;
+
+  --success: #9ece6a; /* green */
+  --success-foreground: #1a1b26;
+  --warning: #e0af68; /* yellow */
+  --warning-foreground: #1a1b26;
+  --bitcoin: #ff9e64; /* orange */
+  --bitcoin-foreground: #1a1b26;
+
+  --qr: #c0caf5;
+  --qr-foreground: #1a1b26;
+}
+
 @layer base {
   * {
     @apply border-border outline-ring/50;

apps/machine/src/views/IdleView.vue

@@ -2,12 +2,15 @@
 import { watch } from 'vue'
 import { useRouter } from 'vue-router'
 import { useAtmStore } from '@/stores/atm'
+import { useTheme } from '@/composables/useTheme'
 import { Button } from '@/components/ui/button'
 import { Card, CardContent } from '@/components/ui/card'
 import { Badge } from '@/components/ui/badge'
+import BitcoinIcon from '@/components/BitcoinIcon.vue'
 
 const router = useRouter()
 const atmStore = useAtmStore()
+const { current: currentTheme, themes } = useTheme()
 
 // Watch for state changes and navigate accordingly
 watch(
@@ -45,7 +48,7 @@ function handleCashOut() {
         @click="handleCashIn"
       >
         <CardContent class="flex h-full flex-col items-center justify-center gap-2 p-6">
-          <span class="text-5xl">💵</span>
+          <BitcoinIcon :size="96" />
           <span class="text-xl font-bold text-success">Buy Bitcoin</span>
           <span class="text-sm text-foreground/70">Insert cash, receive sats</span>
         </CardContent>
@@ -71,6 +74,21 @@ function handleCashOut() {
       <Badge variant="outline" class="border-bitcoin text-bitcoin">Just Bitcoin</Badge>
     </div>
 
+    <!-- Theme switcher -->
+    <div class="flex items-center gap-2">
+      <span class="text-xs text-muted-foreground">Theme:</span>
+      <Button
+        v-for="theme in themes"
+        :key="theme.id"
+        :variant="currentTheme === theme.id ? 'default' : 'outline'"
+        size="sm"
+        class="h-7 text-xs"
+        @click="currentTheme = theme.id"
+      >
+        {{ theme.label }}
+      </Button>
+    </div>
+
     <!-- Debug toggle -->
     <Button
       variant="ghost"