diff --git a/packages/ui/src/components/model-selector.tsx b/packages/ui/src/components/model-selector.tsx
index 005af3ad..6f5c5955 100644
--- a/packages/ui/src/components/model-selector.tsx
+++ b/packages/ui/src/components/model-selector.tsx
@@ -295,7 +295,7 @@ export default function ModelSelector(props: ModelSelectorProps) {
                 {t("modelSelector.trigger.primary", { model: currentModelValue()?.name ?? t("modelSelector.none") })}
               </span>
           {currentModelValue() && (
-                <span class="selector-trigger-secondary">
+                <span class="selector-trigger-secondary" dir="ltr">
                   {currentModelValue()!.providerId}/{currentModelValue()!.id}
                 </span>
               )}
diff --git a/packages/ui/src/styles/components/selector.css b/packages/ui/src/styles/components/selector.css
index bcecda00..414d1213 100644
--- a/packages/ui/src/styles/components/selector.css
+++ b/packages/ui/src/styles/components/selector.css
@@ -40,11 +40,11 @@
 }
 
 .selector-trigger-primary--align-left {
-  @apply text-left w-full;
+  @apply text-start w-full;
 }
 
 .selector-trigger-secondary {
-  @apply text-xs text-left truncate;
+  @apply text-xs text-start truncate w-full;
   color: var(--text-muted);
 }
 
diff --git a/packages/ui/src/styles/markdown.css b/packages/ui/src/styles/markdown.css
index 8cd10e07..bbb4d70f 100644
--- a/packages/ui/src/styles/markdown.css
+++ b/packages/ui/src/styles/markdown.css
@@ -136,6 +136,7 @@
     border-radius: 8px;
     padding: 0.75rem;
     margin: 1rem 0;
+    direction: ltr;
   }
 
   .markdown-body pre:not(.shiki) code,
diff --git a/packages/ui/src/styles/messaging/message-base.css b/packages/ui/src/styles/messaging/message-base.css
index 3a64777c..852bb41d 100644
--- a/packages/ui/src/styles/messaging/message-base.css
+++ b/packages/ui/src/styles/messaging/message-base.css
@@ -258,6 +258,7 @@
   padding: 8px;
   background-color: var(--surface-code);
   border-radius: 4px;
+  direction: ltr;
 }
 
 .message-error-part {
diff --git a/packages/ui/src/styles/messaging/prompt-input.css b/packages/ui/src/styles/messaging/prompt-input.css
index 415e541f..a0cd3ff9 100644
--- a/packages/ui/src/styles/messaging/prompt-input.css
+++ b/packages/ui/src/styles/messaging/prompt-input.css
@@ -344,6 +344,7 @@
   .prompt-input {
     min-height: 0;
     padding: 0.5rem 0.75rem;
+    padding-inline-start: 2.5rem; /* preserve space for nav buttons */
     padding-bottom: 0.75rem;
   }
 
diff --git a/packages/ui/src/styles/messaging/tool-call.css b/packages/ui/src/styles/messaging/tool-call.css
index 53314041..55aa2448 100644
--- a/packages/ui/src/styles/messaging/tool-call.css
+++ b/packages/ui/src/styles/messaging/tool-call.css
@@ -549,6 +549,7 @@
   min-height: auto;
   max-height: none;
   overflow-y: visible;
+  direction: ltr;
 }
 
 /* Shiki injects inline background colors; force token surfaces. */
@@ -762,6 +763,7 @@
   overflow-x: auto;
   max-height: var(--tool-call-max-height-compact, calc(25 * 1.4em));
   overflow-y: scroll;
+  direction: ltr;
 }
 
 .tool-call-section code {