diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
deleted file mode 100644
index 8aade0f..0000000
--- a/.github/copilot-instructions.md
+++ /dev/null
@@ -1,59 +0,0 @@
-# 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`).
diff --git a/src/blog/post-5.md b/src/blog/post-5.md
deleted file mode 100644
index 94029ac..0000000
--- a/src/blog/post-5.md
+++ /dev/null
@@ -1,64 +0,0 @@
----
-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).
diff --git a/src/components/Footer.astro b/src/components/Footer.astro
index 3e2edc3..9c72f54 100644
--- a/src/components/Footer.astro
+++ b/src/components/Footer.astro
@@ -16,5 +16,5 @@
diff --git a/src/components/Navigation.astro b/src/components/Navigation.astro
index 67284b2..4257856 100644
--- a/src/components/Navigation.astro
+++ b/src/components/Navigation.astro
@@ -7,7 +7,7 @@
About
Articles
Tags
-
+
diff --git a/src/layouts/MarkdownPostLayout.astro b/src/layouts/MarkdownPostLayout.astro
index b236a24..af007b0 100644
--- a/src/layouts/MarkdownPostLayout.astro
+++ b/src/layouts/MarkdownPostLayout.astro
@@ -49,27 +49,18 @@ const optionsForDate = {
.markdown-content {
font-family: sans-serif;
- font-size: 1.1rem;
- line-height: 1.8;
+ font-size: 1.2rem;
+ line-height: 2.5;
}
.markdown-content h1 {
- font-size: 1.6rem;
- margin-top: 2rem;
- margin-bottom: 1rem;
- line-height: 1.3;
+ font-size: 1.9rem;
}
.markdown-content h2 {
- font-size: 1.4rem;
- margin-top: 1.8rem;
- margin-bottom: 0.8rem;
- line-height: 1.3;
+ font-size: 1.75rem;
}
.markdown-content h3 {
- font-size: 1.2rem;
- margin-top: 1.5rem;
- margin-bottom: 0.6rem;
- line-height: 1.3;
+ font-size: 1.5rem;
}
diff --git a/src/pages/index.astro b/src/pages/index.astro
index aa7888a..06ba9b9 100644
--- a/src/pages/index.astro
+++ b/src/pages/index.astro
@@ -4,7 +4,6 @@ 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());
---