diff --git a/modules/cybercore-ui/src/test/java/br/com/cybercore/signer/ui/theme/DesignTokenGuardrailTest.java b/modules/cybercore-ui/src/test/java/br/com/cybercore/signer/ui/theme/DesignTokenGuardrailTest.java
index 76d6c74..b4c949e 100644
--- a/modules/cybercore-ui/src/test/java/br/com/cybercore/signer/ui/theme/DesignTokenGuardrailTest.java
+++ b/modules/cybercore-ui/src/test/java/br/com/cybercore/signer/ui/theme/DesignTokenGuardrailTest.java
@@ -108,6 +108,51 @@ class DesignTokenGuardrailTest {
                 .isEmpty();
     }
 
+    @Test
+    @DisplayName("Código da UI e CSS não devem conter referências a .theme-dark, AppTheme ou isDark")
+    void shouldNotContainDarkThemeReferencesInUiCodeOrCss() throws Exception {
+        // 1. Valida theme.css e no-effects.css
+        String[] cssFiles = {"/styles/theme.css", "/styles/no-effects.css"};
+        for (String cssPath : cssFiles) {
+            InputStream stream = getClass().getResourceAsStream(cssPath);
+            if (stream != null) {
+                String content = new String(stream.readAllBytes(), StandardCharsets.UTF_8);
+                assertThat(content)
+                        .withFailMessage("Arquivo %s ainda contém referências a .theme-dark ou .theme-light!", cssPath)
+                        .doesNotContain(".theme-dark")
+                        .doesNotContain(".theme-light");
+            }
+        }
+
+        // 2. Valida fontes Java em src/main/java
+        java.nio.file.Path sourceRoot = java.nio.file.Files.exists(java.nio.file.Path.of("src/main/java"))
+                ? java.nio.file.Path.of("src/main/java")
+                : java.nio.file.Path.of("modules/cybercore-ui/src/main/java");
+
+        List<String> violations = new ArrayList<>();
+        try (var stream = java.nio.file.Files.walk(sourceRoot)) {
+            List<java.nio.file.Path> javaFiles = stream
+                    .filter(java.nio.file.Files::isRegularFile)
+                    .filter(p -> p.toString().endsWith(".java"))
+                    .toList();
+
+            for (java.nio.file.Path file : javaFiles) {
+                List<String> lines = java.nio.file.Files.readAllLines(file, StandardCharsets.UTF_8);
+                for (int i = 0; i < lines.size(); i++) {
+                    String line = lines.get(i);
+                    if (line.contains("AppTheme") || line.contains("isDark(") || line.contains(".theme-dark")) {
+                        violations.add(String.format("%s:%d -> %s", file.getFileName(), i + 1, line.trim()));
+                    }
+                }
+            }
+        }
+
+        assertThat(violations)
+                .withFailMessage("Foram encontradas referências obsoletas a tema escuro no código da UI:\n%s",
+                        String.join("\n", violations))
+                .isEmpty();
+    }
+
     @Test
     @DisplayName("theme.css deve definir todos os tokens de cores semânticas primários e de superfície")
     void shouldDefineAllRequiredSemanticColorTokens() throws Exception {