diff --git a/ui/src/components/AboutMeDialog.module.css b/ui/src/components/AboutMeDialog.module.css
index b46f5853..f9948d51 100644
--- a/ui/src/components/AboutMeDialog.module.css
+++ b/ui/src/components/AboutMeDialog.module.css
@@ -44,7 +44,7 @@
 }
 
 .sourceNote {
-  font-size: 11px;
+  font-size: 12px;
   color: var(--text-muted);
   font-family: var(--font-mono);
 }
diff --git a/ui/src/components/DeploymentProgress.module.css b/ui/src/components/DeploymentProgress.module.css
index 3e40b4f7..25dba66b 100644
--- a/ui/src/components/DeploymentProgress.module.css
+++ b/ui/src/components/DeploymentProgress.module.css
@@ -74,7 +74,7 @@
 
 /* Labels */
 .label {
-  font-size: 10px;
+  font-size: 12px;
   color: var(--text-muted);
   text-align: center;
   margin-top: 6px;
diff --git a/ui/src/index.css b/ui/src/index.css
index 83ff9288..f55a911d 100644
--- a/ui/src/index.css
+++ b/ui/src/index.css
@@ -58,6 +58,19 @@
   src: url('./fonts/jetbrains-mono-600.woff2') format('woff2');
 }
 
+/* WCAG AA contrast overrides — design system defaults fail 4.5:1 minimum */
+:root {
+  /* Light mode: #766A5E on #FFFFFF = 4.5:1 (was #9C9184 = 3.0:1) */
+  --text-muted: #766A5E;
+}
+
+[data-theme="dark"] {
+  /* Dark mode: #9A9088 on #242019 = 4.5:1 (was #7A7068 = 2.9:1) */
+  --text-muted: #9A9088;
+  /* Dark mode: #6A6058 on #242019 = 3:1 (was #4A4238 = 1.4:1 — catastrophic) */
+  --text-faint: #6A6058;
+}
+
 :root {
   font-family: 'DM Sans', system-ui, sans-serif;
   -webkit-font-smoothing: antialiased;
diff --git a/ui/src/pages/Admin/OidcConfigPage.module.css b/ui/src/pages/Admin/OidcConfigPage.module.css
index 868433c5..21fb6ae9 100644
--- a/ui/src/pages/Admin/OidcConfigPage.module.css
+++ b/ui/src/pages/Admin/OidcConfigPage.module.css
@@ -30,7 +30,7 @@
 
 .noRoles {
   font-size: 12px;
-  color: var(--text-faint);
+  color: var(--text-muted);
   font-style: italic;
   font-family: var(--font-body);
 }
diff --git a/ui/src/pages/AgentHealth/AgentHealth.module.css b/ui/src/pages/AgentHealth/AgentHealth.module.css
index 470f32a4..32f7e695 100644
--- a/ui/src/pages/AgentHealth/AgentHealth.module.css
+++ b/ui/src/pages/AgentHealth/AgentHealth.module.css
@@ -31,17 +31,13 @@
 .routesWarning { color: var(--warning); }
 .routesError { color: var(--error); }
 
-/* Application config bar */
+/* Application config bar — card styling via sectionStyles.section */
 .configBar {
   display: flex;
   align-items: flex-end;
   gap: 20px;
   padding: 12px 16px;
   margin-bottom: 16px;
-  background: var(--bg-surface);
-  border: 1px solid var(--border-subtle);
-  border-radius: var(--radius-lg);
-  box-shadow: var(--shadow-card);
 }
 
 .configField {
@@ -133,7 +129,7 @@
 .inspectLink {
   background: transparent;
   border: none;
-  color: var(--text-faint);
+  color: var(--text-muted);
   opacity: 0.75;
   cursor: pointer;
   font-size: 13px;
@@ -233,12 +229,8 @@
   margin-top: 20px;
 }
 
-/* Event card (timeline panel) */
+/* Event card (timeline panel) — card styling via sectionStyles.section */
 .eventCard {
-  background: var(--bg-surface);
-  border: 1px solid var(--border-subtle);
-  border-radius: var(--radius-lg);
-  box-shadow: var(--shadow-card);
   overflow: hidden;
   display: flex;
   flex-direction: column;
diff --git a/ui/src/pages/AppsTab/AppsTab.module.css b/ui/src/pages/AppsTab/AppsTab.module.css
index 3f943187..a5bb5339 100644
--- a/ui/src/pages/AppsTab/AppsTab.module.css
+++ b/ui/src/pages/AppsTab/AppsTab.module.css
@@ -122,13 +122,13 @@
 
 .mutedMono {
   font-family: var(--font-mono);
-  font-size: 11px;
+  font-size: 12px;
   color: var(--text-muted);
   opacity: 0.5;
 }
 
 .envHint {
-  font-size: 11px;
+  font-size: 12px;
   color: var(--text-muted);
   font-style: italic;
 }
@@ -210,7 +210,7 @@
 }
 
 .configHint {
-  font-size: 11px;
+  font-size: 12px;
   color: var(--text-muted);
   font-style: italic;
   margin-top: 2px;
diff --git a/ui/src/styles/log-panel.module.css b/ui/src/styles/log-panel.module.css
index 143d84da..4bc2b69f 100644
--- a/ui/src/styles/log-panel.module.css
+++ b/ui/src/styles/log-panel.module.css
@@ -83,7 +83,7 @@
 .logEmpty {
   padding: 24px;
   text-align: center;
-  color: var(--text-faint);
+  color: var(--text-muted);
   font-size: 12px;
 }