diff --git a/public/style.css b/public/style.css
index 83363eb..7547a02 100644
--- a/public/style.css
+++ b/public/style.css
@@ -61,7 +61,24 @@
   --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
   --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
   --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.15), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
-  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.2), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
+}
+
+/* Ajustes de contraste para o cabeçalho no modo claro */
+[data-theme="light"] .chat-header {
+  background-color: rgba(245, 245, 245, 0.8) !important;
+  border-bottom: 1px solid rgba(0, 0, 0, 0.08) !important;
+}
+
+[data-theme="light"] .chat-header .btn-menu,
+[data-theme="light"] .chat-header .btn-theme-toggle,
+[data-theme="light"] .chat-header .btn-new-chat-mobile {
+  color: var(--text-primary) !important; /* #1a1a1a - Máximo contraste no fundo claro */
+}
+
+[data-theme="light"] .chat-header .btn-menu:hover,
+[data-theme="light"] .chat-header .btn-theme-toggle:hover,
+[data-theme="light"] .chat-header .btn-new-chat-mobile:hover {
+  background-color: rgba(0, 0, 0, 0.06) !important;
 }
 
 * {