diff --git a/.env b/.env
deleted file mode 100644
index e69de29..0000000
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..a711ef9
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,12 @@
+# Auto detect text files and normalize line endings to LF
+* text=auto eol=lf
+
+# Explicit binary files
+*.png binary
+*.jpg binary
+*.jpeg binary
+*.webp binary
+*.gif binary
+*.ico binary
+*.pdf binary
+*.ttf binary
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 2f33ac0..f185b5b 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -79,7 +79,7 @@ jobs:
       - run: pnpm install
       - run: |
           git fetch origin main
-          git diff origin/main..HEAD --name-only | xargs pnpm run validate-blog
+          git diff -z origin/main..HEAD --name-only | xargs -0 -r pnpm run validate-blog
 
   update-blogmeta:
     needs: [validate-blog]
@@ -108,7 +108,7 @@ jobs:
       - name: Update Blog Meta
         run: |
           git fetch origin main
-          git diff origin/main..HEAD --name-status | xargs pnpm run update-blogmeta
+          git diff -z origin/main..HEAD --name-status | xargs -0 -r pnpm run update-blogmeta
       - run: pnpm run format
       - name: Git Commit
         run: |
diff --git a/.gitignore b/.gitignore
index e015602..3a1dd12 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,3 +19,7 @@ dist
 
 # macOS-specific files
 .DS_Store
+
+# Local env files
+.env.local
+.env.*.local
diff --git a/astro.config.ts b/astro.config.ts
index 4587673..6ff4f88 100644
--- a/astro.config.ts
+++ b/astro.config.ts
@@ -10,7 +10,11 @@ import RemarkLinkRewrite, {
 import { getFormatUrl } from './src/utils/validateUrl'
 import pagefind from './src/integrations/pagefind'
 
-const { SITE_URL } = loadEnv(process.env.NODE_ENV!, process.cwd(), '')
+const { SITE_URL } = loadEnv(
+  process.env.NODE_ENV ?? 'development',
+  process.cwd(),
+  '',
+)
 
 // https://astro.build/config
 export default defineConfig({
diff --git a/public/robots.txt b/public/robots.txt
index c9a6956..71db81e 100644
--- a/public/robots.txt
+++ b/public/robots.txt
@@ -1 +1,4 @@
+User-agent: *
+Allow: /
+
 Sitemap: https://oucc.org/sitemap-index.xml
diff --git a/src/assets/drwani_eng.png b/src/assets/drwani_eng.png
deleted file mode 100644
index a24ee65..0000000
Binary files a/src/assets/drwani_eng.png and /dev/null differ
diff --git a/src/components/workshop/Workshop2026Section.astro b/src/components/workshop/Workshop2026Section.astro
index abb9e7a..95fe6d3 100644
--- a/src/components/workshop/Workshop2026Section.astro
+++ b/src/components/workshop/Workshop2026Section.astro
@@ -48,7 +48,7 @@ export const items: Item[] = [
     circleNames: ['RAINBOU'],
     place: '共C301',
     description:
-      'OSや組み込みシステムなど、高速な処理が求められる分野で広く用いられる言語であるC/C++を扱います。阪大の競技プログラミングサークルであるRAINBOUが担当します',
+      'OSや組み込みシステムなど、高速な処理が求められる分野で広く用いられる言語であるC/C++を扱います。阪大の競技プログラミングサークルであるRAINBOUが担当します。',
   },
   {
     date: date(5, 12, 18, 30),
@@ -69,7 +69,7 @@ export const items: Item[] = [
     circleNames: ['RAINBOU'],
     place: '共C405',
     description:
-      'OSや組み込みシステムなど、高速な処理が求められる分野で広く用いられる言語であるC/C++を扱います。阪大の競技プログラミングサークルであるRAINBOUが担当します',
+      'OSや組み込みシステムなど、高速な処理が求められる分野で広く用いられる言語であるC/C++を扱います。阪大の競技プログラミングサークルであるRAINBOUが担当します。',
   },
   {
     date: date(5, 19, 18, 30),
@@ -91,7 +91,7 @@ export const items: Item[] = [
     circleNames: ['RAINBOU'],
     place: '共C305',
     description:
-      'OSや組み込みシステムなど、高速な処理が求められる分野で広く用いられる言語であるC/C++を扱います。阪大の競技プログラミングサークルであるRAINBOUが担当します',
+      'OSや組み込みシステムなど、高速な処理が求められる分野で広く用いられる言語であるC/C++を扱います。阪大の競技プログラミングサークルであるRAINBOUが担当します。',
   },
   {
     date: date(5, 26, 18, 30),
diff --git a/src/content/blogs/2024-06-30-esbuild-plugin-gas-generator.md b/src/content/blogs/2024-06-30-esbuild-plugin-gas-generator.md
index 429bbe2..fe698c6 100644
--- a/src/content/blogs/2024-06-30-esbuild-plugin-gas-generator.md
+++ b/src/content/blogs/2024-06-30-esbuild-plugin-gas-generator.md
@@ -14,7 +14,7 @@ ESModuleとタイトルに書きましたがESModuleをバンドルできると
 
 https://github.com/miyaji255/esbuild-plugin-gas-generator
 
-https://www.npmjs.com/package/esbuild-plugin-gas-generator
+[npm: esbuild-plugin-gas-generator](https://www.npmjs.com/package/esbuild-plugin-gas-generator)
 
 ## 使い方
 
diff --git a/src/content/blogs/2024-12-20-whats-new-dotnet-9-for-wpf.md b/src/content/blogs/2024-12-20-whats-new-dotnet-9-for-wpf.md
index 552c4e1..3b8efdf 100644
--- a/src/content/blogs/2024-12-20-whats-new-dotnet-9-for-wpf.md
+++ b/src/content/blogs/2024-12-20-whats-new-dotnet-9-for-wpf.md
@@ -91,4 +91,4 @@ Windowsにはライト・ダークテーマとは別にアクセントカラー
 
 https://learn.microsoft.com/ja-jp/dotnet/desktop/wpf/whats-new/net90?view=netdesktop-9.0
 
-https://github.com/dotnet/wpf/blob/add-fluent-usage-documentation/Documentation/docs/using-fluent.md
\ No newline at end of file
+https://github.com/dotnet/wpf/blob/main/Documentation/docs/using-fluent.md
\ No newline at end of file
diff --git a/src/content/blogs/2025-12-01-my-server-ansible-pull.md b/src/content/blogs/2025-12-01-my-server-ansible-pull.md
index f112a7e..b0a6e11 100644
--- a/src/content/blogs/2025-12-01-my-server-ansible-pull.md
+++ b/src/content/blogs/2025-12-01-my-server-ansible-pull.md
@@ -76,7 +76,9 @@ cron ではなく systemd の timer を使用して `ansible-pull` を定期実
 
 構成としては、実行用の `.service` と、スケジュール用の `.timer` をペアで作成します。
 
-```ini:my-server-ansible-pull.service
+`my-server-ansible-pull.service`:
+
+```ini
 [Unit]
 Description=CI 成功コミットのみ反映する ansible-pull デプロイ
 
@@ -88,7 +90,9 @@ User=root
 Group=root
 ```
 
-```ini:my-server-ansible-pull.timer
+`my-server-ansible-pull.timer`:
+
+```ini
 [Unit]
 Description=定期デプロイチェック (my-server)
 
diff --git a/src/content/blogs/870/stuff (1).jpg b/src/content/blogs/870/stuff (1).jpg
deleted file mode 100644
index 421b349..0000000
Binary files a/src/content/blogs/870/stuff (1).jpg and /dev/null differ
diff --git a/src/content/blogs/870/stuff (2).jpg b/src/content/blogs/870/stuff (2).jpg
deleted file mode 100644
index 421b349..0000000
Binary files a/src/content/blogs/870/stuff (2).jpg and /dev/null differ
diff --git a/src/content/blogs/870/stuff (3).jpg b/src/content/blogs/870/stuff (3).jpg
deleted file mode 100644
index 421b349..0000000
Binary files a/src/content/blogs/870/stuff (3).jpg and /dev/null differ
diff --git a/src/layouts/BaseLayout.astro b/src/layouts/BaseLayout.astro
index c64598a..b5b860c 100644
--- a/src/layouts/BaseLayout.astro
+++ b/src/layouts/BaseLayout.astro
@@ -33,12 +33,12 @@ const composedTitle = title === undefined ? siteName : `${title} | ${siteName}`
 <!doctype html>
 <html lang="ja" prefix="og: https://ogp.me/ns/website#">
   <head>
-    <GoogleAnalytics />
+    {import.meta.env.PROD && <GoogleAnalytics />}
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width" />
     <meta name="description" content={description} />
     <link rel="canonical" href={canonicalUrl} />
-    <link rel="icon" href="/favicon.webp" />
+    <link rel="icon" type="image/webp" href="/favicon.webp" />
     <title>{composedTitle}</title>
     <slot name="header" />
     <meta property="og:url" content={canonicalUrl} />
diff --git a/src/pages/blog/articles/[slug]/ogp.png.ts b/src/pages/blog/articles/[slug]/ogp.png.ts
index 65893fd..1efd554 100644
--- a/src/pages/blog/articles/[slug]/ogp.png.ts
+++ b/src/pages/blog/articles/[slug]/ogp.png.ts
@@ -16,5 +16,9 @@ export async function GET({
 }: APIContext<Awaited<ReturnType<typeof getStaticPaths>>[number]['props']>) {
   const author = await getEntry(blog.data.author)
   const ogp = await createOgImage(blog.data.title, author.data.name)
-  return new Response(ogp)
+  return new Response(ogp, {
+    headers: {
+      'Content-Type': 'image/png',
+    },
+  })
 }
diff --git a/src/utils/validateUrl.ts b/src/utils/validateUrl.ts
index 8fd47ca..81bd444 100644
--- a/src/utils/validateUrl.ts
+++ b/src/utils/validateUrl.ts
@@ -14,7 +14,7 @@ export function getFormatUrl(base: string = import.meta.env.SITE) {
 
     if (url!.endsWith('/')) return path
     // ファイル拡張子
-    if (url!.match(/\.(a-zA-Z0-9)+$/)) return path
+    if (url!.match(/\.[a-zA-Z0-9]+$/)) return path
 
     return hash ? `${url}/#${hash}` : url + '/'
   }
diff --git a/tools/update-blogmeta.ts b/tools/update-blogmeta.ts
index baedddf..13b5dd5 100644
--- a/tools/update-blogmeta.ts
+++ b/tools/update-blogmeta.ts
@@ -9,7 +9,8 @@ type BlogMeta = {
   postDate: string
   updateDate?: string
 }
-const gitDiffs = validateArgs(chunkArray(process.argv.slice(2)))
+const rawArgs = process.argv.slice(2).filter((arg) => arg !== '--')
+const gitDiffs = validateArgs(chunkArray(rawArgs))
 if (gitDiffs === null) process.exit(1)
 updateBlogMeta(gitDiffs)
 
@@ -163,6 +164,11 @@ function predicateTargetFiles([status, file]: readonly [
 }
 
 function chunkArray(array: string[]) {
+  // 手動実行時など、引数に直接ファイルパスのみが渡された場合に対応
+  if (array.length > 0 && array.every((val) => val.startsWith('src/content'))) {
+    return array.map((filePath) => ['M', filePath])
+  }
+
   const result: string[][] = []
   let tempArray: string[] = []
 
diff --git a/tools/validate-blog.ts b/tools/validate-blog.ts
index 2f140d2..5a7bcd8 100644
--- a/tools/validate-blog.ts
+++ b/tools/validate-blog.ts
@@ -27,7 +27,7 @@ function validateBlog() {
     } else if (parsedPath.dir === 'src/content/blog-metas') {
       // ブログのメタ情報
       if (parsedPath.ext === '.json') continue
-    } else if (parsedPath.dir.match(/^src\/content\/blogs\/[^(#/)]*$/)) {
+    } else if (parsedPath.dir.match(/^src\/content\/blogs\/[^/#]+$/)) {
       // 画像
       if (isImage(parsedPath.ext)) continue
     } else if (