frontend/src/App.tsx

@@ -4,6 +4,7 @@ import { ShoppingCartOutlined, FilterOutlined } from '@ant-design/icons';
 import { Link, useLocation, useSearchParams } from 'react-router-dom';
 import { Item, FilterOptions, fetchItems, fetchFilterOptions } from './api';
 import ItemCard from './components/ItemCard';
+import BrandMark from './components/BrandMark';
 import FilterDrawer from './components/FilterDrawer';
 import ActiveFilterChips from './components/ActiveFilterChips';
 import {
@@ -118,9 +119,15 @@ export default function App() {
           borderBottom: `1px solid ${token.colorBorderSecondary}`
         }}
       >
+        {/* Wrapped so the mark and the wordmark travel together — the title
+            keeps its own ellipsis behaviour when the header gets narrow, and the
+            mark is never what gets truncated. */}
+        <div className="site-header-brand" style={{ color: token.colorText }}>
+          <BrandMark size={28} />
           <Title level={3} className="site-header-title" style={{ color: token.colorText }}>
             Redefined Designs
           </Title>
+        </div>
         <div className="site-header-actions">
           <Switch checked={mode === 'dark'} onChange={toggle} checkedChildren="Dark" unCheckedChildren="Light" />
           <Link to="/cart">

frontend/src/components/BrandMark.tsx

@@ -0,0 +1,65 @@
+import { useId } from 'react';
+
+interface Props {
+  size?: number;
+  className?: string;
+}
+
+/**
+ * The RD monogram, as an inline SVG rather than an `<img src="/favicon.svg">`.
+ *
+ * Two reasons it has to be inline. The tile is drawn in `currentColor`, so it
+ * follows the antd text token and inverts with the app's own theme switch — the
+ * favicon file inverts on `prefers-color-scheme`, which tracks the operating
+ * system and would disagree with the app whenever someone toggles the theme
+ * themselves. And the letters are knocked out with a mask rather than painted in
+ * the background colour, so the mark sits correctly on any surface instead of
+ * carrying a hardcoded backdrop that only matches the header.
+ *
+ * Decorative: the header already says "Redefined Designs" beside it, so it is
+ * hidden from assistive technology rather than read out twice.
+ */
+export default function BrandMark({ size = 28, className }: Props) {
+  // Unique per instance — two marks on one page would otherwise share a mask id
+  // and the second would reference the first. The id is stripped to alphanumerics
+  // because React's generated ids contain colons.
+  const maskId = `rd-knockout-${useId().replace(/[^a-zA-Z0-9]/g, '')}`;
+
+  return (
+    <svg
+      className={className}
+      width={size}
+      height={size}
+      viewBox="0 0 64 64"
+      aria-hidden="true"
+      focusable="false"
+    >
+      <mask id={maskId}>
+        {/* White shows the tile, black punches the letters through it. */}
+        <rect x="2" y="2" width="60" height="60" rx="15" fill="#fff" />
+        <g
+          fill="none"
+          stroke="#000"
+          strokeWidth="6.5"
+          strokeLinecap="butt"
+          strokeLinejoin="miter"
+        >
+          <path d="M15 18 V46" />
+          <path d="M15 18 H20 A7 7 0 0 1 20 32 H15" />
+          <path d="M20 32 L27 46" />
+          <path d="M37 18 V46" />
+          <path d="M37 18 H38 A14 14 0 0 1 38 46 H37" />
+        </g>
+      </mask>
+      <rect
+        x="2"
+        y="2"
+        width="60"
+        height="60"
+        rx="15"
+        fill="currentColor"
+        mask={`url(#${maskId})`}
+      />
+    </svg>
+  );
+}

frontend/src/styles.css

@@ -45,6 +45,19 @@ body { margin: 0; }
   line-height: normal;
 }
 
+.site-header-brand {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  flex: 1 1 auto;
+  min-width: 0;
+}
+
+/* The mark holds its size while the wordmark absorbs the squeeze. */
+.site-header-brand svg {
+  flex: none;
+}
+
 .site-header-title {
   margin: 0 !important;
   font-size: clamp(16px, 5vw, 24px);