diff --git a/src/app/global.css b/src/app/global.css
index 2b2a85d..ab3976f 100644
--- a/src/app/global.css
+++ b/src/app/global.css
@@ -33,12 +33,26 @@ body {
 html {
   /* Prefer dynamic viewport height so layout can adapt to keyboard (if browser resizes) */
   height: 100%;
+  /* Base font size: slightly larger for readability */
+  font-size: 16px;
+}
+@media (min-width: 640px) {
+  html {
+    font-size: 17px;
+  }
+}
+@media (min-width: 1024px) {
+  html {
+    font-size: 18px;
+  }
 }
 body {
   min-height: 100%;
   min-height: 100dvh;
   background-color: var(--background);
   color: var(--foreground);
+  font-size: 1rem;
+  line-height: 1.6;
 }
 
 /* Full-height containers: use dvh so keyboard doesn’t squash the layout when overlay is used */
diff --git a/tailwind.config.js b/tailwind.config.js
index a2f9e87..af40323 100644
--- a/tailwind.config.js
+++ b/tailwind.config.js
@@ -18,6 +18,11 @@ module.exports = {
         border: "var(--border)",
         muted: "var(--muted)",
       },
+      fontSize: {
+        xs: ["0.8125rem", { lineHeight: "1.25rem" }],
+        sm: ["0.9375rem", { lineHeight: "1.375rem" }],
+        base: ["1.0625rem", { lineHeight: "1.625rem" }],
+      },
     },
   },
   plugins: [],