diff --git a/assets/css/marimo.css b/assets/css/marimo.css
index a6e9278..ce155d0 100644
--- a/assets/css/marimo.css
+++ b/assets/css/marimo.css
@@ -396,6 +396,27 @@ body {
   opacity: 1 !important;
 }
 
+/* Hidden-code cells: marimo shows a two-line peek at 20% opacity on the
+   wrapper *around* the editor (out of reach of the rule above), which
+   read as broken grey text. Keep it a quiet peek, but legible. */
+.marimo-cell .cm.opacity-20 {
+  opacity: 0.55 !important;
+}
+
+/* Cells that have not run yet (notebooks open without auto-run so they
+   never contend for the DuckDB write lock): a brass-tinted hairline and
+   an outlined run button instead of a peach glow and yellow fill. */
+.marimo-cell.needs-run {
+  border-color: color-mix(in srgb, var(--chart-5) 35%, var(--border)) !important;
+  outline: none !important;
+}
+
+.marimo-cell [data-testid="run-button"][class*="yellow-3"] {
+  background: var(--card) !important;
+  border-color: var(--chart-5) !important;
+  color: var(--chart-5) !important;
+}
+
 .cm-gutters {
   background: var(--secondary) !important;
   border-right: 1px solid var(--border) !important;