diff --git a/frontend/src/styles.css b/frontend/src/styles.css
new file mode 100644
index 0000000..6b1cc66
--- /dev/null
+++ b/frontend/src/styles.css
@@ -0,0 +1,12 @@
+* { box-sizing: border-box; }
+
+:root {
+  color: #e5e7eb;
+  background: #111827;
+  font-family: system-ui, sans-serif;
+}
+
+body { margin: 0; }
+.page { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
+.card { max-width: 640px; width: 100%; padding: 32px; border: 1px solid #374151; border-radius: 16px; background: #1f2937; box-shadow: 0 16px 40px #0004; }
+.muted { color: #9ca3af; }