diff --git a/content/styles/fonts.css b/content/styles/fonts.css
new file mode 100644
index 0000000..45d68c6
--- /dev/null
+++ b/content/styles/fonts.css
@@ -0,0 +1,53 @@
+/* --- @font-face declarations --- */
+@font-face {
+  font-family: 'Reddit Sans';
+  src: url("../fonts/RedditSans[wght].woff2") format("woff2");
+  font-weight: 300 800;
+  font-style: normal;
+  font-display: swap;
+}
+
+@font-face {
+  font-family: 'Reddit Sans Condensed';
+  src: url("../fonts/RedditSansCondensed[wght].woff2") format("woff2");
+  font-weight: 300 800;
+  font-style: normal;
+  font-display: swap;
+}
+
+@font-face {
+  font-family: 'Reddit Mono';
+  src: url("../fonts/RedditMono[wght].woff2") format("woff2");
+  font-weight: 300 800;
+  font-style: normal;
+  font-display: swap;
+}
+
+/* --- Font overrides (gated on toggle class) --- */
+html.rt-fonts-enabled,
+html.rt-fonts-enabled body,
+html.rt-fonts-enabled input,
+html.rt-fonts-enabled textarea,
+html.rt-fonts-enabled select,
+html.rt-fonts-enabled button {
+  font-family: 'Reddit Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif !important;
+}
+
+html.rt-fonts-enabled .content,
+html.rt-fonts-enabled .side,
+html.rt-fonts-enabled .footer-parent,
+html.rt-fonts-enabled .nav-buttons,
+html.rt-fonts-enabled .tabmenu,
+html.rt-fonts-enabled .morelink,
+html.rt-fonts-enabled .titlebox,
+html.rt-fonts-enabled .searchpane,
+html.rt-fonts-enabled .infobar {
+  font-family: inherit !important;
+}
+
+html.rt-fonts-enabled code,
+html.rt-fonts-enabled pre,
+html.rt-fonts-enabled .md code,
+html.rt-fonts-enabled .md pre {
+  font-family: 'Reddit Mono', 'SF Mono', 'Fira Code', Consolas, monospace !important;
+}
diff --git a/manifest.json b/manifest.json
index 44b93b0..f5530e3 100644
--- a/manifest.json
+++ b/manifest.json
@@ -15,8 +15,8 @@
   },
   "content_scripts": [
     {
-      "matches": ["*://old.reddit.com/*"],
-      "css": ["content/styles/badges.css", "content/styles/cards.css"],
+      "matches": ["*://old.reddit.com/*", "*://www.reddit.com/*"],
+      "css": ["content/styles/badges.css", "content/styles/cards.css", "content/styles/fonts.css"],
       "js": [
         "lib/settings.js",
         "content/tweaks/badges.js",