style: update styles for consistency and responsiveness

src/styles/global.css

@@ -5,14 +5,6 @@
     --color-foreground: var(--foreground);
   }
   
-  /*
-    The default border color has changed to `currentColor` in Tailwind CSS v4,
-    so we've added these compatibility styles to make sure everything still
-    looks the same as it did with Tailwind CSS v3.
-  
-    If we ever want to remove these styles, we need to add an explicit border
-    color utility to any element that depends on these defaults.
-  */
   @layer base {
     *,
     ::after,
@@ -26,18 +18,55 @@
   :root {
     --background: #ffffff;
     --foreground: #171717;
+    --primary: #2563eb;
+    --primary-hover: #1d4ed8;
+    --primary-light: #dbeafe;
+    --gray-50: #f9fafb;
+    --gray-100: #f3f4f6;
+    --gray-200: #e5e7eb;
+    --gray-300: #d1d5db;
+    --gray-400: #9ca3af;
+    --gray-500: #6b7280;
+    --gray-600: #4b5563;
+    --gray-700: #374151;
+    --gray-800: #1f2937;
+    --gray-900: #111827;
+    --radius-sm: 0.25rem;
+    --radius-md: 0.375rem;
+    --radius-lg: 0.5rem;
+    --radius-xl: 0.75rem;
+    --radius-2xl: 1rem;
+    --radius-full: 9999px;
   }
   
   @media (prefers-color-scheme: dark) {
     :root {
       --background: #0a0a0a;
-      --foreground: #ededed;
+      --foreground: #f3f4f6;
+      --primary: #3b82f6;
+      --primary-hover: #60a5fa;
+      --primary-light: #1e3a8a;
+      --gray-50: #18181b;
+      --gray-100: #27272a;
+      --gray-200: #3f3f46;
+      --gray-300: #52525b;
+      --gray-400: #71717a;
+      --gray-500: #a1a1aa;
+      --gray-600: #d4d4d8;
+      --gray-700: #e4e4e7;
+      --gray-800: #f4f4f5;
+      --gray-900: #fafafa;
     }
   }
   
   body {
     color: var(--foreground);
     background: var(--background);
-    font-family: Arial, Helvetica, sans-serif;
+    font-family: 'Instrument Sans', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
+    letter-spacing: -0.025em;
+    text-rendering: optimizeLegibility;
+    -webkit-font-smoothing: antialiased;
+    -moz-osx-font-smoothing: grayscale;
+    overflow-x: hidden;
   }