diff --git a/app/globals.css b/app/globals.css
index f67f08d..b43467c 100644
--- a/app/globals.css
+++ b/app/globals.css
@@ -1,58 +1,109 @@
 @import "tailwindcss";
 
-@layer base {
-  :root {
-    --background: 0 0% 100%;
-    --foreground: 0 0% 3.9%;
-    --card: 0 0% 100%;
-    --card-foreground: 0 0% 3.9%;
-    --popover: 0 0% 100%;
-    --popover-foreground: 0 0% 3.9%;
-    --primary: 0 0% 9%;
-    --primary-foreground: 0 0% 98%;
-    --secondary: 0 0% 96.1%;
-    --secondary-foreground: 0 0% 9%;
-    --muted: 0 0% 96.1%;
-    --muted-foreground: 0 0% 45.1%;
-    --accent: 0 0% 96.1%;
-    --accent-foreground: 0 0% 9%;
-    --destructive: 0 84.2% 60.2%;
-    --destructive-foreground: 0 0% 98%;
-    --border: 0 0% 89.8%;
-    --input: 0 0% 89.8%;
-    --ring: 0 0% 3.9%;
-    --radius: 0.5rem;
-  }
+@source "../components/converter/*.{js,ts,jsx,tsx}";
+@source "../components/ui/*.{js,ts,jsx,tsx}";
+@source "*.{js,ts,jsx,tsx}";
 
-  .dark {
-    --background: 0 0% 3.9%;
-    --foreground: 0 0% 98%;
-    --card: 0 0% 3.9%;
-    --card-foreground: 0 0% 98%;
-    --popover: 0 0% 3.9%;
-    --popover-foreground: 0 0% 98%;
-    --primary: 0 0% 98%;
-    --primary-foreground: 0 0% 9%;
-    --secondary: 0 0% 14.9%;
-    --secondary-foreground: 0 0% 98%;
-    --muted: 0 0% 14.9%;
-    --muted-foreground: 0 0% 63.9%;
-    --accent: 0 0% 14.9%;
-    --accent-foreground: 0 0% 98%;
-    --destructive: 0 62.8% 30.6%;
-    --destructive-foreground: 0 0% 98%;
-    --border: 0 0% 14.9%;
-    --input: 0 0% 14.9%;
-    --ring: 0 0% 83.1%;
-  }
+@custom-variant dark (&:is(.dark *));
+
+:root {
+  --radius: 0.5rem;
+
+  /* Light Mode Colors - Using OKLCH for better color precision */
+  --background: oklch(100% 0 0);
+  --foreground: oklch(9.8% 0.038 285.8);
+  --card: oklch(100% 0 0);
+  --card-foreground: oklch(9.8% 0.038 285.8);
+  --popover: oklch(100% 0 0);
+  --popover-foreground: oklch(9.8% 0.038 285.8);
+  --primary: oklch(22.4% 0.053 285.8);
+  --primary-foreground: oklch(98% 0.016 240);
+  --secondary: oklch(96.1% 0.016 240);
+  --secondary-foreground: oklch(22.4% 0.053 285.8);
+  --muted: oklch(96.1% 0.016 240);
+  --muted-foreground: oklch(46.9% 0.025 244.1);
+  --accent: oklch(96.1% 0.016 240);
+  --accent-foreground: oklch(22.4% 0.053 285.8);
+  --destructive: oklch(60.2% 0.168 29.2);
+  --destructive-foreground: oklch(98% 0.016 240);
+  --border: oklch(91.4% 0.026 243.1);
+  --input: oklch(91.4% 0.026 243.1);
+  --ring: oklch(9.8% 0.038 285.8);
+}
+
+@theme inline {
+  /* Tailwind v4 theme color definitions */
+  --color-background: var(--background);
+  --color-foreground: var(--foreground);
+  --color-card: var(--card);
+  --color-card-foreground: var(--card-foreground);
+  --color-popover: var(--popover);
+  --color-popover-foreground: var(--popover-foreground);
+  --color-primary: var(--primary);
+  --color-primary-foreground: var(--primary-foreground);
+  --color-secondary: var(--secondary);
+  --color-secondary-foreground: var(--secondary-foreground);
+  --color-muted: var(--muted);
+  --color-muted-foreground: var(--muted-foreground);
+  --color-accent: var(--accent);
+  --color-accent-foreground: var(--accent-foreground);
+  --color-destructive: var(--destructive);
+  --color-destructive-foreground: var(--destructive-foreground);
+  --color-border: var(--border);
+  --color-input: var(--input);
+  --color-ring: var(--ring);
+}
+
+.dark {
+  --background: oklch(9.8% 0.038 285.8);
+  --foreground: oklch(98% 0.016 240);
+  --card: oklch(9.8% 0.038 285.8);
+  --card-foreground: oklch(98% 0.016 240);
+  --popover: oklch(9.8% 0.038 285.8);
+  --popover-foreground: oklch(98% 0.016 240);
+  --primary: oklch(98% 0.016 240);
+  --primary-foreground: oklch(22.4% 0.053 285.8);
+  --secondary: oklch(17.5% 0.036 242.3);
+  --secondary-foreground: oklch(98% 0.016 240);
+  --muted: oklch(17.5% 0.036 242.3);
+  --muted-foreground: oklch(65.1% 0.031 244);
+  --accent: oklch(17.5% 0.036 242.3);
+  --accent-foreground: oklch(98% 0.016 240);
+  --destructive: oklch(30.6% 0.125 29.2);
+  --destructive-foreground: oklch(98% 0.016 240);
+  --border: oklch(17.5% 0.036 242.3);
+  --input: oklch(17.5% 0.036 242.3);
+  --ring: oklch(83.9% 0.031 243.7);
 }
 
 @layer base {
   * {
-    @apply border-border;
+    @apply border-border outline-ring/50;
+    transition-property: background-color, border-color, color, fill, stroke;
+    transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
+    transition-duration: 200ms;
   }
+
   body {
     @apply bg-background text-foreground;
-    font-feature-settings: "rlig" 1, "calt" 1;
+    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
+  }
+
+  html {
+    scroll-behavior: smooth;
+  }
+
+  /* Custom scrollbar */
+  ::-webkit-scrollbar {
+    width: 10px;
+    height: 10px;
+  }
+
+  ::-webkit-scrollbar-track {
+    @apply bg-background;
+  }
+
+  ::-webkit-scrollbar-thumb {
+    @apply bg-muted-foreground/20 rounded-lg hover:bg-muted-foreground/30;
   }
 }