diff --git a/content/styles/cards.css b/content/styles/cards.css
new file mode 100644
index 0000000..77ed61d
--- /dev/null
+++ b/content/styles/cards.css
@@ -0,0 +1,67 @@
+/* --- Post list container --- */
+html.rt-card-enabled #siteTable {
+  display: flex;
+  flex-direction: column;
+  align-items: flex-start;
+  gap: var(--rt-card-gap, 1rem);
+}
+
+html.rt-card-enabled #siteTable > .clearleft {
+  display: none;
+}
+
+/* --- Card container --- */
+.rt-card {
+  background: #ffffff;
+  color: #0a0a0a;
+  border: 1px solid #e5e5e5;
+  border-radius: 0.875rem;
+  padding: 1.5rem;
+  box-shadow: 0 1px 2px 0 rgb(0 0 0 / 0.05);
+  transition: border-color 0.15s;
+  display: flex;
+  align-items: flex-start;
+  gap: 0.75rem;
+  width: 100%;
+  overflow: hidden;
+}
+
+.rt-card:hover {
+  border-color: #d4d4d4;
+}
+
+/* --- Card internal layout overrides --- */
+.rt-card .midcol,
+.rt-card .thumbnail {
+  float: none;
+  flex-shrink: 0;
+}
+
+.rt-card .entry {
+  flex: 1;
+  min-width: 0;
+}
+
+.rt-card .clearleft {
+  display: none;
+}
+
+/* --- Card dark mode --- */
+.rt-dark .rt-card {
+  background: #171717;
+  color: #fafafa;
+  border-color: rgba(255, 255, 255, 0.1);
+}
+
+.rt-dark .rt-card:hover {
+  border-color: rgba(255, 255, 255, 0.18);
+}
+
+/* --- Page background override --- */
+html.rt-card-bg-shadcn .content[role="main"] {
+  background: #f5f5f5;
+}
+
+html.rt-card-bg-shadcn.rt-dark .content[role="main"] {
+  background: #262626;
+}
diff --git a/manifest.json b/manifest.json
index 4ef1e29..767a1b6 100644
--- a/manifest.json
+++ b/manifest.json
@@ -16,7 +16,7 @@
   "content_scripts": [
     {
       "matches": ["*://old.reddit.com/*", "*://www.reddit.com/*"],
-      "css": ["content/styles/badges.css"],
+      "css": ["content/styles/badges.css", "content/styles/cards.css"],
       "js": [
         "lib/settings.js",
         "content/tweaks/badges.js",