css fix

app/globals.css

@@ -7,6 +7,8 @@
   --color-secondary-bg: #E6E9ED;
   --color-text-primary: #1F2933;
   --color-text-secondary: #6B7280;
+  
+  --font-family-sans: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
 }
 
 :root {
@@ -35,6 +37,10 @@
 }
 
 @layer base {
+  *, ::after, ::before {
+    box-sizing: border-box;
+  }
+
   html {
     scroll-behavior: smooth;
     -webkit-text-size-adjust: 100%;
@@ -48,6 +54,7 @@
     -webkit-font-smoothing: antialiased;
     -moz-osx-font-smoothing: grayscale;
     text-rendering: optimizeLegibility;
+    margin: 0;
   }
 
   h1, h2, h3, h4, h5, h6 {
@@ -91,12 +98,6 @@
     transition: all var(--transition-fast);
   }
 
-  .container {
-    max-width: 1200px;
-    margin: 0 auto;
-    padding: 0 var(--spacing-lg);
-  }
-
   section {
     padding: clamp(3rem, 8vw, 6rem) 0;
   }