3 files changed, 4 insertions, 4 deletions
diff --git a/src/pages/og/[slug].png.ts b/src/pages/og/[slug].png.ts
index c84af95..8aa355b 100644
--- a/src/pages/og/[slug].png.ts
+++ b/src/pages/og/[slug].png.ts
@@ -63,7 +63,7 @@ export async function getStaticPaths() {
   }
   return [...slugs]
     .filter((s) => s.length > 0)
-    .map((slug) => ({ params: { slug: slug.replace(/\//g, "-") } }));
+    .map((slug) => ({ params: { slug: slug.replace(/\//g, "--") } }));
 }
 
 const fontBuffer = readFileSync("node_modules/.noto-sans-jp.otf");
@@ -116,7 +116,7 @@ export async function GET({ params }: { params: { slug: string } }) {
   let title = pages[slug];
   if (!title) {
     // - を / に戻して確認（ippan-situmon-r7d-3gatu → ippan-situmon/r7d/3gatu）
-    const fileSlug = slug.replace(/-/g, "/");
+    const fileSlug = slug.replace(/--/g, "/");
     title = pages[fileSlug];
     if (!title) {
       const mdxPath = path.join(contentDir, fileSlug + ".mdx");
diff --git a/src/pages/og/index.astro b/src/pages/og/index.astro
index 8bfb7c1..83a992e 100644
--- a/src/pages/og/index.astro
+++ b/src/pages/og/index.astro
@@ -31,7 +31,7 @@ const slugs = [
         .replace(contentDir + "/", "")
         .replace(/\.mdx$/, "")
         .replace(/\/index$/, "")
-        .replace(/\//g, "-")
+        .replace(/\//g, "--")
     )
     .filter((s) => s !== "ippan-situmon"),
 ];
diff --git a/src/plugins/og-image.ts b/src/plugins/og-image.ts
index 7ee6568..c1eeb5c 100644
--- a/src/plugins/og-image.ts
+++ b/src/plugins/og-image.ts
@@ -19,7 +19,7 @@ export default function ogImageIntegration(): AstroIntegration {
 
           let slug = page.pathname.replace(/^\/|\/$/g, "") || "index";
           // URL-safe: replace / with - for nested paths
-          const imageSlug = slug.replace(/\//g, "-");
+          const imageSlug = slug.replace(/\//g, "--");
           const ogImageUrl = `https://yasutakeyohei.com/og/${imageSlug}.png?v=2`;
 
           html = html.replace(