feat: Rebuild application UI with new Header, Footer, HeroModel, and ProductGrid components, integrating smooth scrolling and GSAP animations.

src/styles/variables.css

@@ -0,0 +1,15 @@
+:root {
+  /* Teenage Engineering Palette */
+  --bg-color: #e4e4e4;
+  --text-main: #000000;
+  --text-dim: #666666;
+  --accent-orange: #ff4d00;
+  --grid-line: #cccccc;
+  
+  /* Typos */
+  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
+  --spacing-unit: 8px;
+  
+  /* Layout */
+  --header-height: 60px;
+}