diff --git a/cortex/static/app.js b/cortex/static/app.js
index 4d63623..86b4611 100644
--- a/cortex/static/app.js
+++ b/cortex/static/app.js
@@ -1096,7 +1096,7 @@
         // ── Font size cycle ───────────────────────────────────────────
         const fontSizeBtn = document.getElementById('font-size-btn');
         const fontSizes   = ['normal', 'large', 'small'];
-        const fontSizePx  = { normal: '16px', large: '18px', small: '14px' };
+        const fontSizePx  = { normal: '17px', large: '19px', small: '15px' };
         const fontSizeLbl = { normal: 'Aa', large: 'A+', small: 'A−' };
 
         function applyFontSize(size) {
diff --git a/cortex/static/help.html b/cortex/static/help.html
index eb73496..cf289a4 100644
--- a/cortex/static/help.html
+++ b/cortex/static/help.html
@@ -4,6 +4,9 @@
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>Cortex — Help &amp; Reference</title>
+  <link rel="preconnect" href="https://fonts.googleapis.com">
+  <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+  <link href="https://fonts.googleapis.com/css2?family=Inter:wght@100..900&display=swap" rel="stylesheet">
   <script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
   <style>
     *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
@@ -11,7 +14,10 @@
     body {
       min-height: 100vh;
       background: #0f1117;
-      font-family: system-ui, -apple-system, sans-serif;
+      font-family: 'Inter', system-ui, -apple-system, sans-serif;
+      font-weight: 450;
+      -webkit-font-smoothing: antialiased;
+      -moz-osx-font-smoothing: grayscale;
       color: #e2e8f0;
       padding: 2rem 1.5rem;
     }
diff --git a/cortex/static/index.html b/cortex/static/index.html
index 8a60ca2..e293fc1 100644
--- a/cortex/static/index.html
+++ b/cortex/static/index.html
@@ -5,15 +5,18 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Cortex — Inara</title>
     <link rel="icon" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='.9em' font-size='90'>✨</text></svg>">
+    <link rel="preconnect" href="https://fonts.googleapis.com">
+    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@100..900&display=swap" rel="stylesheet">
     <!-- Apply saved theme + font size before first paint to avoid flash -->
     <script>
         (function(){
             var t = localStorage.getItem('theme');
             if (!t) t = window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
             document.documentElement.setAttribute('data-theme', t);
-            var sizes = { normal: '16px', large: '18px', small: '14px' };
+            var sizes = { normal: '17px', large: '19px', small: '15px' };
             var fs = localStorage.getItem('font-size') || 'normal';
-            document.documentElement.style.fontSize = sizes[fs] || '16px';
+            document.documentElement.style.fontSize = sizes[fs] || '17px';
         })();
     </script>
     <link rel="stylesheet" href="/static/style.css">
diff --git a/cortex/static/login.html b/cortex/static/login.html
index 47731eb..b598458 100644
--- a/cortex/static/login.html
+++ b/cortex/static/login.html
@@ -4,6 +4,9 @@
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>Cortex — Sign In</title>
+  <link rel="preconnect" href="https://fonts.googleapis.com">
+  <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+  <link href="https://fonts.googleapis.com/css2?family=Inter:wght@100..900&display=swap" rel="stylesheet">
   <style>
     *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
 
@@ -13,7 +16,10 @@
       align-items: center;
       justify-content: center;
       background: #0f1117;
-      font-family: system-ui, -apple-system, sans-serif;
+      font-family: 'Inter', system-ui, -apple-system, sans-serif;
+      font-weight: 450;
+      -webkit-font-smoothing: antialiased;
+      -moz-osx-font-smoothing: grayscale;
       color: #e2e8f0;
     }
 
diff --git a/cortex/static/settings.html b/cortex/static/settings.html
index cd86c32..246a627 100644
--- a/cortex/static/settings.html
+++ b/cortex/static/settings.html
@@ -4,6 +4,9 @@
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>Cortex — Account Settings</title>
+  <link rel="preconnect" href="https://fonts.googleapis.com">
+  <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+  <link href="https://fonts.googleapis.com/css2?family=Inter:wght@100..900&display=swap" rel="stylesheet">
   <style>
     *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
 
@@ -13,7 +16,10 @@
       align-items: center;
       justify-content: center;
       background: #0f1117;
-      font-family: system-ui, -apple-system, sans-serif;
+      font-family: 'Inter', system-ui, -apple-system, sans-serif;
+      font-weight: 450;
+      -webkit-font-smoothing: antialiased;
+      -moz-osx-font-smoothing: grayscale;
       color: #e2e8f0;
       padding: 1.5rem;
     }
diff --git a/cortex/static/setup.html b/cortex/static/setup.html
index a9cbc2b..21d2bf9 100644
--- a/cortex/static/setup.html
+++ b/cortex/static/setup.html
@@ -4,6 +4,9 @@
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>Cortex — Setup</title>
+  <link rel="preconnect" href="https://fonts.googleapis.com">
+  <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+  <link href="https://fonts.googleapis.com/css2?family=Inter:wght@100..900&display=swap" rel="stylesheet">
   <style>
     *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
 
@@ -13,7 +16,10 @@
       align-items: center;
       justify-content: center;
       background: #0f1117;
-      font-family: system-ui, -apple-system, sans-serif;
+      font-family: 'Inter', system-ui, -apple-system, sans-serif;
+      font-weight: 450;
+      -webkit-font-smoothing: antialiased;
+      -moz-osx-font-smoothing: grayscale;
       color: #e2e8f0;
       padding: 1.5rem;
     }
diff --git a/cortex/static/style.css b/cortex/static/style.css
index de77d8e..d0f6fb1 100644
--- a/cortex/static/style.css
+++ b/cortex/static/style.css
@@ -94,7 +94,10 @@
         }
 
         body {
-            font-family: system-ui, -apple-system, sans-serif;
+            font-family: 'Inter', system-ui, -apple-system, sans-serif;
+            font-weight: 450;
+            -webkit-font-smoothing: antialiased;
+            -moz-osx-font-smoothing: grayscale;
             background: var(--bg);
             color: var(--text);
             height: 100vh;