diff --git a/src/app/(dashboard)/dashboard-shell.tsx b/src/app/(dashboard)/dashboard-shell.tsx
index 5606f99..0ad55b0 100644
--- a/src/app/(dashboard)/dashboard-shell.tsx
+++ b/src/app/(dashboard)/dashboard-shell.tsx
@@ -29,7 +29,7 @@ function DashboardShellInner({ children }: { children: React.ReactNode }) {
     return (
       <div className="flex h-screen items-center justify-center bg-slate-950">
         <div className="flex flex-col items-center gap-3">
-          <div className="h-8 w-8 animate-spin rounded-full border-2 border-violet-500 border-t-transparent" />
+          <div className="h-8 w-8 animate-spin rounded-full border-2 border-primary border-t-transparent" />
           <p className="text-sm text-slate-400">Loading...</p>
         </div>
       </div>
diff --git a/src/app/(dashboard)/flows/[id]/page.tsx b/src/app/(dashboard)/flows/[id]/page.tsx
index 2d25bee..3a8de76 100644
--- a/src/app/(dashboard)/flows/[id]/page.tsx
+++ b/src/app/(dashboard)/flows/[id]/page.tsx
@@ -88,7 +88,7 @@ export default function FlowEditorPage() {
         <button
           type="button"
           onClick={() => router.push("/flows")}
-          className="text-sm text-violet-400 hover:text-violet-300"
+          className="text-sm text-primary hover:opacity-80"
         >
           ← Back to flows
         </button>
diff --git a/src/app/(dashboard)/flows/[id]/runs/page.tsx b/src/app/(dashboard)/flows/[id]/runs/page.tsx
index da6dc2b..78d7ced 100644
--- a/src/app/(dashboard)/flows/[id]/runs/page.tsx
+++ b/src/app/(dashboard)/flows/[id]/runs/page.tsx
@@ -173,7 +173,7 @@ export default function FlowRunsPage() {
         <button
           type="button"
           onClick={() => router.push("/flows")}
-          className="text-sm text-violet-400 hover:text-violet-300"
+          className="text-sm text-primary hover:opacity-80"
         >
           ← Back to flows
         </button>
diff --git a/src/app/(dashboard)/flows/page.tsx b/src/app/(dashboard)/flows/page.tsx
index e037bd5..0476901 100644
--- a/src/app/(dashboard)/flows/page.tsx
+++ b/src/app/(dashboard)/flows/page.tsx
@@ -271,9 +271,9 @@ export default function FlowsPage() {
                       type="button"
                       onClick={() => handleUseTemplate(t.slug)}
                       disabled={creating}
-                      className="flex flex-col gap-2.5 rounded-lg border border-slate-800 bg-slate-950 p-4 text-left transition-colors hover:border-violet-500/40 hover:bg-slate-800 disabled:opacity-50"
+                      className="flex flex-col gap-2.5 rounded-lg border border-slate-800 bg-slate-950 p-4 text-left transition-colors hover:border-primary/40 hover:bg-slate-800 disabled:opacity-50"
                     >
-                      <Icon className="h-5 w-5 text-violet-400" />
+                      <Icon className="h-5 w-5 text-primary" />
                       <span className="text-sm font-semibold text-white">
                         {t.name}
                       </span>
@@ -366,7 +366,7 @@ function FlowCard({
     <div className="flex flex-col rounded-lg border border-slate-800 bg-slate-900 p-4 transition-colors hover:border-slate-700">
       <div className="flex items-start justify-between gap-2">
         <div className="flex min-w-0 items-center gap-2">
-          <Workflow className="h-4 w-4 shrink-0 text-violet-400" />
+          <Workflow className="h-4 w-4 shrink-0 text-primary" />
           <h3 className="truncate text-sm font-semibold text-white">
             {flow.name}
           </h3>
diff --git a/src/app/(dashboard)/settings/page.tsx b/src/app/(dashboard)/settings/page.tsx
index 0dc8d5d..4c29725 100644
--- a/src/app/(dashboard)/settings/page.tsx
+++ b/src/app/(dashboard)/settings/page.tsx
@@ -1,7 +1,7 @@
 'use client';
 
 import { useRouter, useSearchParams } from 'next/navigation';
-import { Settings, MessageSquare, Tag, User } from 'lucide-react';
+import { Settings, MessageSquare, Tag, User, Palette } from 'lucide-react';
 import { Tabs, TabsList, TabsTrigger, TabsContent } from '@/components/ui/tabs';
 import { WhatsAppConfig } from '@/components/settings/whatsapp-config';
 import { TemplateManager } from '@/components/settings/template-manager';
@@ -9,8 +9,15 @@ import { TagManager } from '@/components/settings/tag-manager';
 import { ProfileForm } from '@/components/settings/profile-form';
 import { PasswordForm } from '@/components/settings/password-form';
 import { SessionsCard } from '@/components/settings/sessions-card';
+import { AppearancePanel } from '@/components/settings/appearance-panel';
 
-const TAB_VALUES = ['profile', 'whatsapp', 'templates', 'tags'] as const;
+const TAB_VALUES = [
+  'profile',
+  'whatsapp',
+  'templates',
+  'tags',
+  'appearance',
+] as const;
 type TabValue = (typeof TAB_VALUES)[number];
 
 function isTabValue(v: string | null): v is TabValue {
@@ -48,32 +55,39 @@ export default function SettingsPage() {
         <TabsList className="bg-slate-900 border border-slate-700">
           <TabsTrigger
             value="profile"
-            className="data-active:bg-slate-800 data-active:text-violet-400 text-slate-400"
+            className="data-active:bg-slate-800 data-active:text-primary text-slate-400"
           >
             <User className="size-4" />
             Profile
           </TabsTrigger>
           <TabsTrigger
             value="whatsapp"
-            className="data-active:bg-slate-800 data-active:text-violet-400 text-slate-400"
+            className="data-active:bg-slate-800 data-active:text-primary text-slate-400"
           >
             <Settings className="size-4" />
             WhatsApp Config
           </TabsTrigger>
           <TabsTrigger
             value="templates"
-            className="data-active:bg-slate-800 data-active:text-violet-400 text-slate-400"
+            className="data-active:bg-slate-800 data-active:text-primary text-slate-400"
           >
             <MessageSquare className="size-4" />
             Templates
           </TabsTrigger>
           <TabsTrigger
             value="tags"
-            className="data-active:bg-slate-800 data-active:text-violet-400 text-slate-400"
+            className="data-active:bg-slate-800 data-active:text-primary text-slate-400"
           >
             <Tag className="size-4" />
             Tags
           </TabsTrigger>
+          <TabsTrigger
+            value="appearance"
+            className="data-active:bg-slate-800 data-active:text-primary text-slate-400"
+          >
+            <Palette className="size-4" />
+            Appearance
+          </TabsTrigger>
         </TabsList>
 
         <TabsContent value="profile" className="space-y-6">
@@ -93,6 +107,10 @@ export default function SettingsPage() {
         <TabsContent value="tags">
           <TagManager />
         </TabsContent>
+
+        <TabsContent value="appearance">
+          <AppearancePanel />
+        </TabsContent>
       </Tabs>
     </div>
   );
diff --git a/src/app/globals.css b/src/app/globals.css
index 25b8e6f..0212fe0 100644
--- a/src/app/globals.css
+++ b/src/app/globals.css
@@ -48,7 +48,29 @@
   --radius-4xl: calc(var(--radius) * 2.6);
 }
 
-:root {
+/* ============================================================
+ * COLOR THEMES
+ *
+ * 5 dark themes sharing structure, swapping only the primary
+ * accent (and a tiny hue rotation on the slate base). Switched
+ * at runtime by setting `document.documentElement.dataset.theme`
+ * — see ThemeProvider + the inline boot script in layout.tsx.
+ *
+ * `:root` mirrors Violet so default visitors render correctly
+ * before JS runs. `[data-theme="violet"]` is included for the
+ * explicit-select path (settings UI sets it after a pick).
+ *
+ * The three `--primary-*` extras (hover / soft / soft-2) are
+ * new — used for hovered primary buttons and tinted-primary
+ * surfaces (sidebar active pill, validation badges). Components
+ * that don't use them remain backward-compatible.
+ *
+ * Token shapes come straight from the design handoff at
+ * project/Color Themes.html — change one, change the other.
+ * ============================================================ */
+
+:root,
+html[data-theme="violet"] {
   --background: oklch(0.13 0.01 260);
   --foreground: oklch(0.985 0 0);
   --card: oklch(0.18 0.01 260);
@@ -57,6 +79,9 @@
   --popover-foreground: oklch(0.985 0 0);
   --primary: oklch(0.526 0.247 293);
   --primary-foreground: oklch(0.985 0 0);
+  --primary-hover: oklch(0.6 0.22 293);
+  --primary-soft: oklch(0.526 0.247 293 / 0.12);
+  --primary-soft-2: oklch(0.526 0.247 293 / 0.2);
   --secondary: oklch(0.22 0.01 260);
   --secondary-foreground: oklch(0.985 0 0);
   --muted: oklch(0.22 0.01 260);
@@ -83,6 +108,154 @@
   --sidebar-ring: oklch(0.526 0.247 293);
 }
 
+html[data-theme="emerald"] {
+  --background: oklch(0.135 0.01 200);
+  --foreground: oklch(0.985 0 0);
+  --card: oklch(0.185 0.01 200);
+  --card-foreground: oklch(0.985 0 0);
+  --popover: oklch(0.185 0.01 200);
+  --popover-foreground: oklch(0.985 0 0);
+  --primary: oklch(0.62 0.16 162);
+  --primary-foreground: oklch(0.16 0.02 162);
+  --primary-hover: oklch(0.68 0.15 162);
+  --primary-soft: oklch(0.62 0.16 162 / 0.12);
+  --primary-soft-2: oklch(0.62 0.16 162 / 0.22);
+  --secondary: oklch(0.225 0.01 200);
+  --secondary-foreground: oklch(0.985 0 0);
+  --muted: oklch(0.225 0.01 200);
+  --muted-foreground: oklch(0.65 0.01 200);
+  --accent: oklch(0.225 0.01 200);
+  --accent-foreground: oklch(0.985 0 0);
+  --destructive: oklch(0.577 0.245 27.325);
+  --border: oklch(0.285 0.01 200);
+  --input: oklch(0.285 0.01 200);
+  --ring: oklch(0.62 0.16 162);
+  --chart-1: oklch(0.62 0.16 162);
+  --chart-2: oklch(0.7 0.14 195);
+  --chart-3: oklch(0.439 0 0);
+  --chart-4: oklch(0.371 0 0);
+  --chart-5: oklch(0.269 0 0);
+  --sidebar: oklch(0.165 0.01 200);
+  --sidebar-foreground: oklch(0.985 0 0);
+  --sidebar-primary: oklch(0.62 0.16 162);
+  --sidebar-primary-foreground: oklch(0.16 0.02 162);
+  --sidebar-accent: oklch(0.225 0.01 200);
+  --sidebar-accent-foreground: oklch(0.985 0 0);
+  --sidebar-border: oklch(0.285 0.01 200);
+  --sidebar-ring: oklch(0.62 0.16 162);
+}
+
+html[data-theme="cobalt"] {
+  --background: oklch(0.13 0.015 252);
+  --foreground: oklch(0.985 0 0);
+  --card: oklch(0.18 0.015 252);
+  --card-foreground: oklch(0.985 0 0);
+  --popover: oklch(0.18 0.015 252);
+  --popover-foreground: oklch(0.985 0 0);
+  --primary: oklch(0.585 0.2 254);
+  --primary-foreground: oklch(0.985 0 0);
+  --primary-hover: oklch(0.66 0.18 254);
+  --primary-soft: oklch(0.585 0.2 254 / 0.12);
+  --primary-soft-2: oklch(0.585 0.2 254 / 0.22);
+  --secondary: oklch(0.22 0.015 252);
+  --secondary-foreground: oklch(0.985 0 0);
+  --muted: oklch(0.22 0.015 252);
+  --muted-foreground: oklch(0.65 0.012 252);
+  --accent: oklch(0.22 0.015 252);
+  --accent-foreground: oklch(0.985 0 0);
+  --destructive: oklch(0.577 0.245 27.325);
+  --border: oklch(0.28 0.015 252);
+  --input: oklch(0.28 0.015 252);
+  --ring: oklch(0.585 0.2 254);
+  --chart-1: oklch(0.585 0.2 254);
+  --chart-2: oklch(0.7 0.15 220);
+  --chart-3: oklch(0.439 0 0);
+  --chart-4: oklch(0.371 0 0);
+  --chart-5: oklch(0.269 0 0);
+  --sidebar: oklch(0.16 0.015 252);
+  --sidebar-foreground: oklch(0.985 0 0);
+  --sidebar-primary: oklch(0.585 0.2 254);
+  --sidebar-primary-foreground: oklch(0.985 0 0);
+  --sidebar-accent: oklch(0.22 0.015 252);
+  --sidebar-accent-foreground: oklch(0.985 0 0);
+  --sidebar-border: oklch(0.28 0.015 252);
+  --sidebar-ring: oklch(0.585 0.2 254);
+}
+
+html[data-theme="amber"] {
+  --background: oklch(0.135 0.012 60);
+  --foreground: oklch(0.985 0 0);
+  --card: oklch(0.185 0.012 60);
+  --card-foreground: oklch(0.985 0 0);
+  --popover: oklch(0.185 0.012 60);
+  --popover-foreground: oklch(0.985 0 0);
+  --primary: oklch(0.745 0.16 65);
+  --primary-foreground: oklch(0.18 0.03 65);
+  --primary-hover: oklch(0.8 0.15 65);
+  --primary-soft: oklch(0.745 0.16 65 / 0.12);
+  --primary-soft-2: oklch(0.745 0.16 65 / 0.22);
+  --secondary: oklch(0.225 0.012 60);
+  --secondary-foreground: oklch(0.985 0 0);
+  --muted: oklch(0.225 0.012 60);
+  --muted-foreground: oklch(0.66 0.01 60);
+  --accent: oklch(0.225 0.012 60);
+  --accent-foreground: oklch(0.985 0 0);
+  --destructive: oklch(0.577 0.245 27.325);
+  --border: oklch(0.285 0.012 60);
+  --input: oklch(0.285 0.012 60);
+  --ring: oklch(0.745 0.16 65);
+  --chart-1: oklch(0.745 0.16 65);
+  --chart-2: oklch(0.7 0.15 35);
+  --chart-3: oklch(0.439 0 0);
+  --chart-4: oklch(0.371 0 0);
+  --chart-5: oklch(0.269 0 0);
+  --sidebar: oklch(0.165 0.012 60);
+  --sidebar-foreground: oklch(0.985 0 0);
+  --sidebar-primary: oklch(0.745 0.16 65);
+  --sidebar-primary-foreground: oklch(0.18 0.03 65);
+  --sidebar-accent: oklch(0.225 0.012 60);
+  --sidebar-accent-foreground: oklch(0.985 0 0);
+  --sidebar-border: oklch(0.285 0.012 60);
+  --sidebar-ring: oklch(0.745 0.16 65);
+}
+
+html[data-theme="rose"] {
+  --background: oklch(0.13 0.012 15);
+  --foreground: oklch(0.985 0 0);
+  --card: oklch(0.18 0.012 15);
+  --card-foreground: oklch(0.985 0 0);
+  --popover: oklch(0.18 0.012 15);
+  --popover-foreground: oklch(0.985 0 0);
+  --primary: oklch(0.645 0.22 16);
+  --primary-foreground: oklch(0.985 0 0);
+  --primary-hover: oklch(0.71 0.2 16);
+  --primary-soft: oklch(0.645 0.22 16 / 0.12);
+  --primary-soft-2: oklch(0.645 0.22 16 / 0.22);
+  --secondary: oklch(0.22 0.012 15);
+  --secondary-foreground: oklch(0.985 0 0);
+  --muted: oklch(0.22 0.012 15);
+  --muted-foreground: oklch(0.65 0.01 15);
+  --accent: oklch(0.22 0.012 15);
+  --accent-foreground: oklch(0.985 0 0);
+  --destructive: oklch(0.577 0.245 27.325);
+  --border: oklch(0.28 0.012 15);
+  --input: oklch(0.28 0.012 15);
+  --ring: oklch(0.645 0.22 16);
+  --chart-1: oklch(0.645 0.22 16);
+  --chart-2: oklch(0.7 0.18 340);
+  --chart-3: oklch(0.439 0 0);
+  --chart-4: oklch(0.371 0 0);
+  --chart-5: oklch(0.269 0 0);
+  --sidebar: oklch(0.16 0.012 15);
+  --sidebar-foreground: oklch(0.985 0 0);
+  --sidebar-primary: oklch(0.645 0.22 16);
+  --sidebar-primary-foreground: oklch(0.985 0 0);
+  --sidebar-accent: oklch(0.22 0.012 15);
+  --sidebar-accent-foreground: oklch(0.985 0 0);
+  --sidebar-border: oklch(0.28 0.012 15);
+  --sidebar-ring: oklch(0.645 0.22 16);
+}
+
 @layer base {
   * {
     @apply border-border outline-ring/50;
diff --git a/src/app/layout.tsx b/src/app/layout.tsx
index 9e3207d..0956aa5 100644
--- a/src/app/layout.tsx
+++ b/src/app/layout.tsx
@@ -1,7 +1,10 @@
 import type { Metadata, Viewport } from "next";
 import { Inter } from "next/font/google";
+import Script from "next/script";
 import { Toaster } from "sonner";
 import "./globals.css";
+import { ThemeProvider } from "@/hooks/use-theme";
+import { DEFAULT_THEME, STORAGE_KEY, THEME_IDS } from "@/lib/themes";
 
 const inter = Inter({
   variable: "--font-sans",
@@ -33,26 +36,63 @@ export const viewport: Viewport = {
   colorScheme: "dark",
 };
 
+// Inline boot script — runs before React hydrates so the user's
+// chosen theme is on the <html> element before first paint. Without
+// this every page load flashes the default Violet for a frame before
+// the React tree mounts and applies the picked theme.
+//
+// Kept dependency-free (no imports, no JSX) — must be a string the
+// browser can run as a single <script>. Knowledge of valid theme IDs
+// is sourced from the THEME_IDS constant so adding a theme doesn't
+// silently break the boot path.
+const THEME_BOOT_SCRIPT = `
+(function(){
+  try {
+    var STORAGE_KEY = ${JSON.stringify(STORAGE_KEY)};
+    var DEFAULT = ${JSON.stringify(DEFAULT_THEME)};
+    var ALLOWED = ${JSON.stringify(THEME_IDS)};
+    var saved = localStorage.getItem(STORAGE_KEY);
+    var theme = ALLOWED.indexOf(saved) !== -1 ? saved : DEFAULT;
+    document.documentElement.dataset.theme = theme;
+  } catch (_e) {
+    document.documentElement.dataset.theme = ${JSON.stringify(DEFAULT_THEME)};
+  }
+})();
+`;
+
 export default function RootLayout({
   children,
 }: Readonly<{
   children: React.ReactNode;
 }>) {
   return (
-    <html lang="en" className={`${inter.variable} h-full antialiased`}>
-      <body className="min-h-full bg-slate-950 text-white font-sans">
-        {children}
-        <Toaster
-          theme="dark"
-          position="top-right"
-          toastOptions={{
-            style: {
-              background: "rgb(30 41 59)",
-              border: "1px solid rgb(51 65 85)",
-              color: "white",
-            },
-          }}
+    <html
+      lang="en"
+      data-theme={DEFAULT_THEME}
+      className={`${inter.variable} h-full antialiased`}
+    >
+      <head>
+        <Script
+          id="theme-boot"
+          strategy="beforeInteractive"
+          dangerouslySetInnerHTML={{ __html: THEME_BOOT_SCRIPT }}
         />
+      </head>
+      <body className="min-h-full bg-background text-foreground font-sans">
+        <ThemeProvider>
+          {children}
+          <Toaster
+            theme="dark"
+            position="top-right"
+            toastOptions={{
+              style: {
+                background: "rgb(30 41 59)",
+                border: "1px solid rgb(51 65 85)",
+                color: "white",
+              },
+            }}
+          />
+        </ThemeProvider>
       </body>
     </html>
   );
diff --git a/src/components/flows/flow-builder.tsx b/src/components/flows/flow-builder.tsx
index a7c4fc8..252672d 100644
--- a/src/components/flows/flow-builder.tsx
+++ b/src/components/flows/flow-builder.tsx
@@ -712,7 +712,7 @@ function Header({
       </div>
       <div className="flex flex-wrap items-start justify-between gap-3">
         <div className="flex min-w-0 flex-1 items-center gap-3">
-          <Workflow className="h-5 w-5 shrink-0 text-violet-400" />
+          <Workflow className="h-5 w-5 shrink-0 text-primary" />
           <Input
             value={state.name}
             onChange={(e) =>
@@ -920,7 +920,7 @@ function EntryPicker({
   if (state.nodes.length === 0) return null;
   return (
     <section className="flex items-center gap-3 rounded-lg border border-slate-800 bg-slate-900 p-3">
-      <CornerDownRight className="h-4 w-4 shrink-0 text-violet-400" />
+      <CornerDownRight className="h-4 w-4 shrink-0 text-primary" />
       <span className="text-xs text-slate-400">Entry node:</span>
       <NodeKeySelect
         value={state.entry_node_id}
@@ -977,10 +977,10 @@ function NodeCard({
         hasError
           ? "border-red-500/40"
           : isEntry
-            ? "border-violet-500/40"
+            ? "border-primary/50"
             : "border-slate-800",
         isFlashed &&
-          "ring-2 ring-violet-400 ring-offset-2 ring-offset-slate-950",
+          "ring-2 ring-primary ring-offset-2 ring-offset-slate-950",
       )}
     >
       <button
@@ -1000,7 +1000,7 @@ function NodeCard({
             {isEntry && (
               <Badge
                 variant="outline"
-                className="border-violet-500/40 bg-violet-500/10 text-[10px] text-violet-300"
+                className="border-primary/40 bg-primary/10 text-[10px] text-primary"
               >
                 Entry
               </Badge>
diff --git a/src/components/layout/header.tsx b/src/components/layout/header.tsx
index 56f3e19..86689f8 100644
--- a/src/components/layout/header.tsx
+++ b/src/components/layout/header.tsx
@@ -80,7 +80,7 @@ export function Header({ onOpenSidebar }: HeaderProps) {
                 alt={profile.full_name ?? "Avatar"}
               />
             ) : null}
-            <AvatarFallback className="bg-violet-500/10 text-sm font-medium text-violet-500">
+            <AvatarFallback className="bg-primary/10 text-sm font-medium text-primary">
               {initial}
             </AvatarFallback>
           </Avatar>
diff --git a/src/components/layout/sidebar.tsx b/src/components/layout/sidebar.tsx
index 6e713e7..7f49fcd 100644
--- a/src/components/layout/sidebar.tsx
+++ b/src/components/layout/sidebar.tsx
@@ -129,8 +129,8 @@ export function Sidebar({ open = false, onClose }: SidebarProps) {
             close button is hidden since the sidebar is always-visible. */}
         <div className="flex h-14 shrink-0 items-center justify-between gap-2 border-b border-slate-800 px-4">
           <Link href="/dashboard" className="flex items-center gap-2">
-            <div className="flex h-8 w-8 items-center justify-center rounded-lg bg-violet-500">
-              <MessageSquare className="h-4 w-4 text-white" />
+            <div className="flex h-8 w-8 items-center justify-center rounded-lg bg-primary text-primary-foreground">
+              <MessageSquare className="h-4 w-4" />
             </div>
             <span className="text-sm font-semibold text-white">
               CRM Template for WhatsApp
@@ -172,7 +172,7 @@ export function Sidebar({ open = false, onClose }: SidebarProps) {
                       // Taller on mobile so fingers can hit the row reliably (≥44px).
                       "flex items-center gap-3 rounded-lg px-3 py-2.5 text-sm font-medium transition-colors lg:py-2",
                       isActive
-                        ? "bg-violet-500/10 text-violet-500"
+                        ? "bg-primary/10 text-primary"
                         : "text-slate-400 hover:bg-slate-800 hover:text-white",
                     )}
                   >
@@ -183,8 +183,8 @@ export function Sidebar({ open = false, onClose }: SidebarProps) {
                         aria-label={`${totalUnread} unread conversation${totalUnread === 1 ? "" : "s"}`}
                         className="relative flex h-2 w-2"
                       >
-                        <span className="absolute inline-flex h-full w-full animate-ping rounded-full bg-violet-400 opacity-75" />
-                        <span className="relative inline-flex h-2 w-2 rounded-full bg-violet-500" />
+                        <span className="absolute inline-flex h-full w-full animate-ping rounded-full bg-primary opacity-75" />
+                        <span className="relative inline-flex h-2 w-2 rounded-full bg-primary" />
                       </span>
                     )}
                   </Link>
@@ -205,7 +205,7 @@ export function Sidebar({ open = false, onClose }: SidebarProps) {
                     className={cn(
                       "flex items-center gap-3 rounded-lg px-3 py-2.5 text-sm font-medium transition-colors lg:py-2",
                       isActive
-                        ? "bg-violet-500/10 text-violet-500"
+                        ? "bg-primary/10 text-primary"
                         : "text-slate-400 hover:bg-slate-800 hover:text-white",
                     )}
                   >
@@ -229,7 +229,7 @@ export function Sidebar({ open = false, onClose }: SidebarProps) {
                     alt={profile.full_name ?? "Avatar"}
                   />
                 ) : null}
-                <AvatarFallback className="bg-violet-500/10 text-sm font-medium text-violet-500">
+                <AvatarFallback className="bg-primary/10 text-sm font-medium text-primary">
                   {profile?.full_name?.charAt(0)?.toUpperCase() ??
                     profile?.email?.charAt(0)?.toUpperCase() ??
                     "U"}
diff --git a/src/components/settings/appearance-panel.tsx b/src/components/settings/appearance-panel.tsx
new file mode 100644
index 0000000..3dfc0a5
--- /dev/null
+++ b/src/components/settings/appearance-panel.tsx
@@ -0,0 +1,113 @@
+"use client";
+
+import { Check } from "lucide-react";
+
+import { useTheme } from "@/hooks/use-theme";
+import { THEMES, type ThemeId } from "@/lib/themes";
+import { cn } from "@/lib/utils";
+
+/**
+ * Appearance panel — color-theme picker.
+ *
+ * Click a card → applies + persists immediately. No save button:
+ * the whole change is a single CSS-variable swap on <html>, there's
+ * nothing to roll back. The active card carries a check chip + a
+ * primary-tinted border so the current pick is obvious.
+ *
+ * Persistence: localStorage only (device-scoped). The boot script in
+ * layout.tsx replays the choice before first paint on subsequent
+ * loads.
+ */
+export function AppearancePanel() {
+  const { theme, setTheme } = useTheme();
+  return (
+    <section className="space-y-4">
+      <div>
+        <h2 className="text-lg font-semibold text-white">Color theme</h2>
+        <p className="mt-1 text-sm text-slate-400">
+          Pick the accent color used across the app. All themes stay
+          dark — only the primary color (buttons, active nav, badges)
+          changes. Saved to this device.
+        </p>
+      </div>
+
+      <div className="grid grid-cols-1 gap-3 sm:grid-cols-2 lg:grid-cols-3">
+        {THEMES.map((t) => (
+          <ThemeCard
+            key={t.id}
+            id={t.id}
+            name={t.name}
+            tagline={t.tagline}
+            swatch={t.swatch}
+            isActive={t.id === theme}
+            onPick={() => setTheme(t.id)}
+          />
+        ))}
+      </div>
+    </section>
+  );
+}
+
+function ThemeCard({
+  id,
+  name,
+  tagline,
+  swatch,
+  isActive,
+  onPick,
+}: {
+  id: ThemeId;
+  name: string;
+  tagline: string;
+  swatch: string;
+  isActive: boolean;
+  onPick: () => void;
+}) {
+  return (
+    <button
+      type="button"
+      onClick={onPick}
+      aria-pressed={isActive}
+      aria-label={`Use ${name} theme`}
+      className={cn(
+        "flex flex-col gap-3 rounded-lg border bg-card p-4 text-left transition-colors",
+        isActive
+          ? "border-primary/60 ring-2 ring-primary/40"
+          : "border-slate-800 hover:border-slate-700 hover:bg-slate-800/40",
+      )}
+    >
+      <div className="flex items-center justify-between">
+        <span
+          aria-hidden
+          className="h-8 w-8 shrink-0 rounded-full"
+          style={{
+            background: swatch,
+            boxShadow: "inset 0 0 0 1px oklch(1 0 0 / 0.15)",
+          }}
+        />
+        {isActive && (
+          <span className="inline-flex items-center gap-1 rounded-full bg-primary/15 px-2 py-0.5 text-[11px] font-medium text-primary">
+            <Check className="h-3 w-3" />
+            Active
+          </span>
+        )}
+      </div>
+      <div>
+        <div className="text-sm font-semibold text-white">{name}</div>
+        <div className="mt-1 text-xs leading-relaxed text-slate-400">
+          {tagline}
+        </div>
+      </div>
+      <div
+        className="mt-1 flex h-2 overflow-hidden rounded-full"
+        aria-hidden
+      >
+        <span className="flex-1" style={{ background: swatch }} />
+        <span className="w-3 bg-slate-700" />
+        <span className="w-3 bg-slate-800" />
+        <span className="w-3 bg-slate-900" />
+      </div>
+      <span className="sr-only">Theme id: {id}</span>
+    </button>
+  );
+}
diff --git a/src/hooks/use-theme.tsx b/src/hooks/use-theme.tsx
new file mode 100644
index 0000000..dd909ea
--- /dev/null
+++ b/src/hooks/use-theme.tsx
@@ -0,0 +1,106 @@
+"use client";
+
+import {
+  createContext,
+  useCallback,
+  useContext,
+  useEffect,
+  useState,
+  type ReactNode,
+} from "react";
+
+import {
+  DEFAULT_THEME,
+  STORAGE_KEY,
+  isThemeId,
+  type ThemeId,
+} from "@/lib/themes";
+
+/**
+ * ThemeProvider — wraps the whole app, owns the active theme state.
+ *
+ * The boot script in `src/app/layout.tsx` has already applied
+ * `document.documentElement.dataset.theme` before React hydrates, so
+ * by the time this Provider mounts the page is already painted in
+ * the right colors. We just have to read what's there and keep it
+ * in sync going forward.
+ *
+ * Persistence is localStorage only (device-scoped). A future
+ * follow-up could mirror to `profiles.preferences` for cross-device
+ * sync, but a per-device choice is also defensible — your phone may
+ * deserve a different theme than your laptop.
+ */
+
+interface ThemeContextValue {
+  theme: ThemeId;
+  setTheme: (next: ThemeId) => void;
+}
+
+const ThemeContext = createContext<ThemeContextValue | null>(null);
+
+function readInitialTheme(): ThemeId {
+  if (typeof window === "undefined") return DEFAULT_THEME;
+  // Whatever the boot script applied is the truth. Fall back to
+  // localStorage / default if for some reason the attribute is missing
+  // (e.g. someone bypassed the boot script in a custom layout).
+  const fromAttr = document.documentElement.dataset.theme;
+  if (isThemeId(fromAttr)) return fromAttr;
+  try {
+    const stored = localStorage.getItem(STORAGE_KEY);
+    if (isThemeId(stored)) return stored;
+  } catch {
+    // localStorage can throw in private-browsing / sandboxed contexts.
+  }
+  return DEFAULT_THEME;
+}
+
+export function ThemeProvider({ children }: { children: ReactNode }) {
+  const [theme, setThemeState] = useState<ThemeId>(readInitialTheme);
+
+  const setTheme = useCallback((next: ThemeId) => {
+    setThemeState(next);
+    if (typeof document !== "undefined") {
+      document.documentElement.dataset.theme = next;
+    }
+    try {
+      localStorage.setItem(STORAGE_KEY, next);
+    } catch {
+      // Same private-browsing edge case as above; the in-memory state
+      // still updates so the current tab works for the session.
+    }
+  }, []);
+
+  // Sync from other tabs — if you change your theme in tab A, tab B
+  // catches up without a refresh.
+  useEffect(() => {
+    function onStorage(e: StorageEvent) {
+      if (e.key !== STORAGE_KEY) return;
+      if (isThemeId(e.newValue) && e.newValue !== theme) {
+        setThemeState(e.newValue);
+        document.documentElement.dataset.theme = e.newValue;
+      }
+    }
+    window.addEventListener("storage", onStorage);
+    return () => window.removeEventListener("storage", onStorage);
+  }, [theme]);
+
+  return (
+    <ThemeContext.Provider value={{ theme, setTheme }}>
+      {children}
+    </ThemeContext.Provider>
+  );
+}
+
+export function useTheme(): ThemeContextValue {
+  const ctx = useContext(ThemeContext);
+  if (!ctx) {
+    // Fallback for components rendered outside the provider — return a
+    // no-op setter so callers don't crash. The boot script still
+    // applied the right CSS attribute, so visually the page is fine.
+    return {
+      theme: DEFAULT_THEME,
+      setTheme: () => {},
+    };
+  }
+  return ctx;
+}
diff --git a/src/lib/themes.ts b/src/lib/themes.ts
new file mode 100644
index 0000000..374ac22
--- /dev/null
+++ b/src/lib/themes.ts
@@ -0,0 +1,81 @@
+/**
+ * Single source of truth for the color-theme catalog.
+ *
+ * The CSS variables themselves live in `src/app/globals.css` under
+ * `html[data-theme="..."]` blocks — that file is the one we paste
+ * theme tokens into. This module only carries the metadata the UI
+ * (settings picker, no-flash boot script) needs.
+ *
+ * Adding a new theme is a two-step change:
+ *   1. Append the new `html[data-theme="<id>"]` block in globals.css
+ *      with every token from an existing theme (use violet as the
+ *      shape reference).
+ *   2. Add an entry below. The order here drives the picker grid.
+ */
+
+export const THEME_IDS = [
+  "violet",
+  "emerald",
+  "cobalt",
+  "amber",
+  "rose",
+] as const;
+
+export type ThemeId = (typeof THEME_IDS)[number];
+
+export const DEFAULT_THEME: ThemeId = "violet";
+
+export const STORAGE_KEY = "wacrm.theme";
+
+export interface ThemeMeta {
+  id: ThemeId;
+  name: string;
+  tagline: string;
+  /**
+   * Static swatch color for the picker chip. Hard-coded so the boot
+   * script / picker cards don't need a getComputedStyle round trip
+   * before the page settles. Must mirror `--primary` of the same
+   * theme in globals.css.
+   */
+  swatch: string;
+}
+
+export const THEMES: ReadonlyArray<ThemeMeta> = [
+  {
+    id: "violet",
+    name: "Violet",
+    tagline: "The default — confident, slightly playful.",
+    swatch: "oklch(0.526 0.247 293)",
+  },
+  {
+    id: "emerald",
+    name: "Emerald",
+    tagline: "Growth-coded, nods at messaging without copying WhatsApp green.",
+    swatch: "oklch(0.62 0.16 162)",
+  },
+  {
+    id: "cobalt",
+    name: "Cobalt",
+    tagline: "Clean B2B-SaaS blue — calm and product-y.",
+    swatch: "oklch(0.585 0.2 254)",
+  },
+  {
+    id: "amber",
+    name: "Amber",
+    tagline: "Warm and friendly — feels good for SMB teams.",
+    swatch: "oklch(0.745 0.16 65)",
+  },
+  {
+    id: "rose",
+    name: "Rose",
+    tagline: "Bold and modern — D2C, creator-economy, lifestyle.",
+    swatch: "oklch(0.645 0.22 16)",
+  },
+];
+
+export function isThemeId(value: unknown): value is ThemeId {
+  return (
+    typeof value === "string" &&
+    (THEME_IDS as ReadonlyArray<string>).includes(value)
+  );
+}