diff --git a/landing/hero-p0.css b/landing/hero-p0.css
index 294de89c6..d91b3709c 100644
--- a/landing/hero-p0.css
+++ b/landing/hero-p0.css
@@ -1,5 +1,5 @@
 /* ARSAS P0 hero refinement.
-   Desktop-only composition fixes based on production visual review.
+   Desktop composition + localized-copy safety based on production visual review.
    Keeps content, SEO, release sync and mobile behavior unchanged. */
 
 @media (min-width: 981px) {
@@ -24,16 +24,21 @@
   }
 
   .hero h1 {
-    max-width: 34rem;
+    max-width: min(36.5rem, 100%);
     margin-top: 1.22rem;
     font-size: clamp(3.65rem, 4.35vw, 4.08rem);
     line-height: 1.025;
     letter-spacing: -.046em;
   }
 
+  /* Never make translated headline length part of the layout contract.
+     English still remains on one line where it naturally fits; longer locales
+     may wrap instead of escaping the text column and being clipped by .hero. */
   .hero h1 .gradient-text {
     display: block;
-    white-space: nowrap;
+    max-inline-size: 100%;
+    white-space: normal;
+    text-wrap: balance;
   }
 
   .hero-copy {
@@ -85,6 +90,32 @@
     right: -.7rem;
     bottom: 11%;
   }
+
+  /* Indonesian copy is materially longer than English. Give the message and
+     product equal authority instead of shrinking or clipping the translation. */
+  .hero:lang(id) .hero-grid {
+    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
+    gap: clamp(1.85rem, 2.8vw, 2.6rem);
+  }
+
+  .hero:lang(id) h1 {
+    max-width: min(36.5rem, 100%);
+    font-size: clamp(3.45rem, 4.05vw, 3.86rem);
+  }
+
+  .hero:lang(id) .hero-copy {
+    max-width: 36rem;
+  }
+
+  .hero:lang(id) .eyebrow {
+    max-width: 100%;
+    white-space: normal;
+    line-height: 1.35;
+  }
+
+  .hero:lang(id) .hero-visual {
+    width: 105%;
+  }
 }
 
 @media (min-width: 981px) and (max-width: 1180px) {
@@ -109,4 +140,19 @@
   .hero-visual {
     width: 104%;
   }
+
+  /* At compact desktop widths localized controls may wrap deliberately.
+     This is preferable to horizontal overflow or hidden actions. */
+  .hero:lang(id) h1 {
+    font-size: clamp(3.25rem, 4.75vw, 3.55rem);
+  }
+
+  .hero:lang(id) .hero-actions,
+  .hero:lang(id) .hero-proof {
+    flex-wrap: wrap;
+  }
+
+  .hero:lang(id) .hero-visual {
+    width: 102%;
+  }
 }
diff --git a/tests/ARSAS.Tests/WebsiteHeroLocalizationRegressionTests.cs b/tests/ARSAS.Tests/WebsiteHeroLocalizationRegressionTests.cs
new file mode 100644
index 000000000..361c658b3
--- /dev/null
+++ b/tests/ARSAS.Tests/WebsiteHeroLocalizationRegressionTests.cs
@@ -0,0 +1,43 @@
+namespace ARSAS.Tests;
+
+public sealed class WebsiteHeroLocalizationRegressionTests
+{
+    [Fact]
+    public void HeroGradientHeadline_AllowsLocalizedCopyToWrapInsteadOfClipping()
+    {
+        var css = Read("landing/hero-p0.css").Replace("\r\n", "\n", StringComparison.Ordinal);
+
+        Assert.Contains(".hero h1 .gradient-text", css, StringComparison.Ordinal);
+        Assert.Contains("white-space: normal;", css, StringComparison.Ordinal);
+        Assert.DoesNotContain(
+            ".hero h1 .gradient-text {\n    display: block;\n    white-space: nowrap;",
+            css,
+            StringComparison.Ordinal);
+    }
+
+    [Fact]
+    public void IndonesianHero_HasDedicatedDesktopSafetyRules()
+    {
+        var css = Read("landing/hero-p0.css");
+
+        Assert.Contains(".hero:lang(id) .hero-grid", css, StringComparison.Ordinal);
+        Assert.Contains(".hero:lang(id) h1", css, StringComparison.Ordinal);
+        Assert.Contains(".hero:lang(id) .eyebrow", css, StringComparison.Ordinal);
+        Assert.Contains(".hero:lang(id) .hero-actions", css, StringComparison.Ordinal);
+        Assert.Contains("flex-wrap: wrap;", css, StringComparison.Ordinal);
+    }
+
+    private static string Read(string relativePath)
+    {
+        DirectoryInfo? directory = new(AppContext.BaseDirectory);
+        while (directory != null)
+        {
+            var candidate = Path.Combine(directory.FullName, relativePath);
+            if (File.Exists(candidate))
+                return File.ReadAllText(candidate);
+            directory = directory.Parent;
+        }
+
+        throw new FileNotFoundException(relativePath);
+    }
+}