From 17ffdde1db9cd29fdaa9edcc3d09a5480380ab15 Mon Sep 17 00:00:00 2001
From: Daisuke <nakada0907@outlook.com>
Date: Thu, 1 Jan 2026 11:26:04 +0900
Subject: [PATCH 1/4] chore(infra): remove deprecated Amplify deployment stack

---
 amplify-stack.yaml | 61 ----------------------------------------------
 1 file changed, 61 deletions(-)
 delete mode 100644 amplify-stack.yaml

diff --git a/amplify-stack.yaml b/amplify-stack.yaml
deleted file mode 100644
index 8bc55fa..0000000
--- a/amplify-stack.yaml
+++ /dev/null
@@ -1,61 +0,0 @@
-AWSTemplateFormatVersion: '2010-09-09'
-Description: 'CloudFormation template for deploying Astro site to AWS Amplify'
-
-Parameters:
-  GitHubAccessToken:
-    Type: String
-    NoEcho: true
-    Description: GitHub Access token for repository access
-
-Resources:
-  AmplifyApp:
-    Type: AWS::Amplify::App
-    UpdateReplacePolicy: Delete
-    DeletionPolicy: Delete
-    Properties:
-      Name: blog_daisuke_nakahara
-      Repository: https://github.com/Daisuke897/blog_daisuke_nakahara
-      AccessToken: !Ref GitHubAccessToken
-      Platform: WEB
-      BuildSpec: |
-        version: 1
-        frontend:
-          phases:
-            preBuild:
-              commands:
-                - npm ci --cache .npm --prefer-offline
-            build:
-              commands:
-                - npm run build
-          artifacts:
-            baseDirectory: dist
-            files:
-              - '**/*'
-          cache:
-            paths:
-              - .npm/**/*
-      CustomRules:
-        - Source: '</^[^.]+$|\.(?!(css|gif|ico|jpg|js|png|txt|svg|woff|woff2|ttf|map|json)$)([^.]+$)/'
-          Target: '/index.html'
-          Status: '404-200'
-      EnableBranchAutoDeletion: false
-      CustomHeaders: ''
-
-  AmplifyBranch:
-    Type: AWS::Amplify::Branch
-    UpdateReplacePolicy: Delete
-    DeletionPolicy: Delete
-    Properties:
-      AppId: !GetAtt AmplifyApp.AppId
-      EnableAutoBuild: true
-      EnablePullRequestPreview: false
-      EnablePerformanceMode: false
-      Stage: PRODUCTION
-      BranchName: main
-      Framework: Astro
-
-Outputs:
-
-  AppId:
-    Description: 'Amplify App ID'
-    Value: !GetAtt AmplifyApp.AppId

From 989b829a20c0569dc40305e57f8c46fcdda3a2ec Mon Sep 17 00:00:00 2001
From: Daisuke <nakada0907@outlook.com>
Date: Fri, 2 Jan 2026 21:27:59 +0900
Subject: [PATCH 2/4] chore: polish layout and homepage lists

---
 src/components/Footer.astro          |  2 +-
 src/components/Navigation.astro      |  2 +-
 src/layouts/MarkdownPostLayout.astro | 19 ++++++++++++++-----
 src/pages/index.astro                |  3 ++-
 4 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/src/components/Footer.astro b/src/components/Footer.astro
index 9c72f54..3e2edc3 100644
--- a/src/components/Footer.astro
+++ b/src/components/Footer.astro
@@ -16,5 +16,5 @@
 </style>
 
 <footer>
-    <p class="legal-information">&copy; 2025 Nakahara Daisuke</p>
+    <p class="legal-information">&copy; 2026 Nakahara Daisuke — Built with <a href="https://astro.build" target="_blank" rel="noopener">Astro</a></p>
 </footer>
diff --git a/src/components/Navigation.astro b/src/components/Navigation.astro
index 4257856..67284b2 100644
--- a/src/components/Navigation.astro
+++ b/src/components/Navigation.astro
@@ -7,7 +7,7 @@
     <a href="/about/">About</a>
     <a href="/blog/">Articles</a>
     <a href="/tags/">Tags</a>
-    <a href="https://git.n-daisuke897.com/" target="_blank">
+    <a href="https://git.n-daisuke897.com/nakada0907/" target="_blank">
         <img src="/icon/simple-icons--forgejo.svg" alt="Forgejo Icon">
     </a>
 </div>
diff --git a/src/layouts/MarkdownPostLayout.astro b/src/layouts/MarkdownPostLayout.astro
index af007b0..b236a24 100644
--- a/src/layouts/MarkdownPostLayout.astro
+++ b/src/layouts/MarkdownPostLayout.astro
@@ -49,18 +49,27 @@ const optionsForDate = {
 
   .markdown-content {
     font-family: sans-serif;
-    font-size: 1.2rem;
-    line-height: 2.5;
+    font-size: 1.1rem;
+    line-height: 1.8;
   }
 
   .markdown-content h1 {
-    font-size: 1.9rem;
+    font-size: 1.6rem;
+    margin-top: 2rem;
+    margin-bottom: 1rem;
+    line-height: 1.3;
   }
   .markdown-content h2 {
-    font-size: 1.75rem;
+    font-size: 1.4rem;
+    margin-top: 1.8rem;
+    margin-bottom: 0.8rem;
+    line-height: 1.3;
   }
   .markdown-content h3 {
-    font-size: 1.5rem;
+    font-size: 1.2rem;
+    margin-top: 1.5rem;
+    margin-bottom: 0.6rem;
+    line-height: 1.3;
   }
 
 </style>
diff --git a/src/pages/index.astro b/src/pages/index.astro
index 06ba9b9..aa7888a 100644
--- a/src/pages/index.astro
+++ b/src/pages/index.astro
@@ -4,6 +4,7 @@ import BlogPost from "../components/BlogPost.astro";
 import { getCollection } from "astro:content";
 const pageTitle = "Naputo";
 const allPosts = await getCollection("blog");
+const sortedPosts = allPosts.sort((a, b) => b.data.pubDate.valueOf() - a.data.pubDate.valueOf());
 ---
 
 <style>
@@ -41,7 +42,7 @@ const allPosts = await getCollection("blog");
 	<h3 class="header-new-posts">New Posts</h3>
 	<div class="new-articles">
 		{
-			allPosts.slice(0, 6).map((post: any) => (
+			sortedPosts.slice(0, 5).map((post: any) => (
 				<BlogPost
 					url={`/posts/${post.id}/`}
 					title={post.data.title}

From 1cf9933d080615cef1421271be80b81d28e79936 Mon Sep 17 00:00:00 2001
From: Daisuke <nakada0907@outlook.com>
Date: Fri, 2 Jan 2026 21:28:51 +0900
Subject: [PATCH 3/4] docs: add post on fixing GitHub Copilot CLI system vault
 error

Add new blog post explaining how to resolve the "system vault not available"
error when installing GitHub Copilot CLI using systemd and gnome-keyring.
Includes step-by-step instructions with command examples.
---
 src/blog/post-5.md | 64 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 src/blog/post-5.md

diff --git a/src/blog/post-5.md b/src/blog/post-5.md
new file mode 100644
index 0000000..94029ac
--- /dev/null
+++ b/src/blog/post-5.md
@@ -0,0 +1,64 @@
+---
+title: 'Fixing GitHub Copilot CLI System Vault Error with systemd'
+pubDate: 2026-01-02
+author: 'Nakahara Daisuke'
+tags: ["GitHub", "AI"]
+---
+
+When installing GitHub Copilot CLI, you may encounter the error message: `The system vault (keychain, keyring, password manager, etc.) is not available. You may need to install one.` The solution was documented in [this issue](https://github.com/github/copilot-cli/issues/49).
+
+This article explains how to resolve this issue using `systemd`.
+
+### Install via Apt
+
+```bash
+$ sudo apt update
+```
+```bash
+$ sudo apt install -y \
+  gnome-keyring \
+  libsecret-1-0 \
+  libsecret-tools \
+  seahorse
+```
+
+### Verify systemd is running
+```bash
+$ systemctl is-system-running
+```
+
+### Check if the user service is enabled
+```bash
+$ systemctl --user status gnome-keyring-daemon
+○ gnome-keyring-daemon.service - GNOME Keyring daemon
+     Loaded: loaded (/usr/lib/systemd/user/gnome-keyring-daemon.service; enabled; preset: enabled)
+     Active: inactive (dead)
+TriggeredBy: ○ gnome-keyring-daemon.socket
+```
+```bash
+$ systemctl --user enable gnome-keyring-daemon
+```
+```bash
+$ systemctl --user start gnome-keyring-daemon
+```
+```bash
+$ systemctl --user status gnome-keyring-daemon
+● gnome-keyring-daemon.service - GNOME Keyring daemon
+     Loaded: loaded (/usr/lib/systemd/user/gnome-keyring-daemon.service; enabled; preset: enabled)
+     Active: active (running) since Fri 2026-01-02 08:36:46 JST; 3s ago
+ Invocation: d830e5563e974edc9265650d11dfa086
+TriggeredBy: ● gnome-keyring-daemon.socket
+   Main PID: 5222 (gnome-keyring-d)
+      Tasks: 5 (limit: 9422)
+     Memory: 3.4M (peak: 3.9M)
+        CPU: 37ms
+     CGroup: /user.slice/user-1000.slice/user@1000.service/app.slice/gnome-keyring-daemon.service
+             └─5222 /usr/bin/gnome-keyring-daemon --foreground --components=pkcs11,secrets --control-directory=/run/user/1000/keyring
+
+Jan 02 08:36:46 hostname systemd[649]: Started gnome-keyring-daemon.service - GNOME Keyring daemon.
+Jan 02 08:36:46 hostname gnome-keyring-daemon[5222]: GNOME_KEYRING_CONTROL=/run/user/1000/keyring
+Jan 02 08:36:46 hostname gnome-keyring-daemon[5222]: another secret service is running
+Jan 02 08:36:46 hostname gnome-keyring-d[5222]: another secret service is running
+```
+
+> **Note**: This article was translated from Japanese to English and reviewed with the assistance of AI (GitHub Copilot).

From e2a03464009ec8cc37053366b50c7a6e5b5264a0 Mon Sep 17 00:00:00 2001
From: Daisuke <nakada0907@outlook.com>
Date: Fri, 2 Jan 2026 21:30:34 +0900
Subject: [PATCH 4/4] chore: add Copilot instructions for project guidance

  Add Copilot-specific instructions documenting project overview, tech stack,
  structure, development guidelines, and best practices for AI-assisted development.
---
 .github/copilot-instructions.md | 59 +++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 .github/copilot-instructions.md

diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
new file mode 100644
index 0000000..8aade0f
--- /dev/null
+++ b/.github/copilot-instructions.md
@@ -0,0 +1,59 @@
+# Copilot Instructions for n-daisuke897-blog
+
+## Project Overview
+This is a personal blog named "Naputo" built with Astro and Preact. The blog is designed to publish articles and content with a modern static site generation approach.
+
+**Repository**: https://git.n-daisuke897.com/nakada0907/n-daisuke897-blog
+
+## Tech Stack
+- **Framework**: Astro 5.x
+- **UI Library**: Preact 10.x for interactive components
+- **Language**: TypeScript
+- **Build Tool**: Astro CLI
+- **RSS**: @astrojs/rss for RSS feed generation
+- **Linting**: ESLint with TypeScript and Astro plugins
+
+## Project Structure
+- `src/`: Source code
+  - `pages/`: Astro pages (routing based on file structure)
+  - `layouts/`: Layout components
+  - `components/`: Reusable components
+  - `blog/`: Blog content
+  - `styles/`: Global styles
+  - `scripts/`: Utility scripts
+  - `content.config.ts`: Content collection configuration
+- `public/`: Static assets (images, fonts, etc.)
+- `dist/`: Build output directory
+- `buildspec.yml`: AWS CodeBuild configuration
+
+## Development Guidelines
+
+### Commands
+- `npm install`: Install dependencies
+- `npm run dev`: Start local development server at `localhost:4321`
+- `npm run build`: Build production site to `./dist/`
+- `npm run preview`: Preview production build locally
+- `npm run astro`: Run Astro CLI commands
+
+### Coding Standards
+- Use TypeScript for all new code
+- Follow the ESLint configuration provided
+- Use Preact components for interactive UI elements
+- Keep components modular and reusable
+- Use Astro's component syntax for static content
+
+### File Naming
+- Use kebab-case for file names
+- Use PascalCase for component names
+- Use `.astro` extension for Astro components
+- Use `.tsx` extension for Preact components
+
+### Best Practices
+- Prefer static generation over client-side rendering when possible
+- Use Astro's content collections for blog posts
+- Optimize images and assets before adding to `public/`
+- Keep bundle size minimal - Astro ships zero JS by default
+- Use Preact only when client interactivity is needed
+
+## Deployment
+This project uses AWS CodeBuild for deployment (see `buildspec.yml`).