C++ 静的メンバ

main.cpp

#include "rat.h"
#include <iostream>

using namespace std;

int main() {
	CRat *r1, *r2, *r3;
	r1 = new CRat();    //  一匹目のネズミ生成
	r1->squeak();
	CRat::showNum();    //  ネズミの数を表示
	r2 = new CRat();    //  二匹目のネズミ生成
	r3 = new CRat();    //  三匹目のネズミ生成
	r2->squeak();
	r3->squeak();
	delete r1;          //  一匹目のネズミ消去
	delete r2;          //  二匹目のネズミ消去
	CRat::showNum();    //  ネズミの数を表示
	delete r3;          //  三匹目のネズミ消去
	CRat::showNum();    //  ネズミの数を表示
	return 0;
}

rat.cpp

#include "rat.h"
#include <iostream>

using namespace std;

//  ネズミの数の初期値を0に設定
int CRat::m_count = 0;

//  コンストラクタ
CRat::CRat() : m_id(0) {
	m_id = m_count;    //  ネズミの数を、IDとする。
	m_count++;        //  ネズミの数を一つ増やす
}
//  デストラクタ
CRat::~CRat() {
	cout << "ネズミ:" << m_id << "消去" << endl;
	m_count--;        //  ネズミの数を一つ減らす
}
//  ネズミの数の出力
void CRat::showNum()
{
	cout << "現在のネズミの数は、" << m_count << " 匹です。" << endl;
}
//  ネズミが鳴く
void CRat::squeak()
{
	cout << m_id << ":" << "チューチュー" << endl;
}

rat.h

#ifndef _RAT_H_
#define _RAT_H_

class CRat {
public:
	//  コンストラクタ
	CRat();
	//  デストラクタ
	~CRat();
	//  ネズミの数の出力
	static void showNum();
	//  ネズミが鳴く
	void squeak();
private:
	//  ネズミの番号
	int m_id;
	//  ネズミの数
	static int m_count;
};

#endif /* _RAT_H_ */

C++ string

#include <iostream>
#include <string>

using namespace std;

int main() {
	string s;
	s = "This is a";    //  最初の文字列
	s.append(" pen.");  //  文字列の追加
	cout << s << endl;
	cout << "文字列の長さ：" << s.length() << endl;
	//  printfで表示
	printf("char*:%s\n", s.c_str());
	return 0;
}

C++ コンソールから入力

#include <iostream>

using namespace std;

int main() {
	int a;
	cin >> a;
	cout << "a=" << a << endl;
	return 0;
}

C言語 printf

include

void main()
{
printf(“こんにちは。私の名前は%sです。\n年齢は%d歳です。\n”, “長留裕平”, 32);
printf(“イニシャルは、%cです。\n”, ‘T’);
printf(“%f + %f = %f\n”, 1.2, 2.7, 1.2 + 2.7);
}

C言語　HelloWorld

include<stdio.h>

void main() {
printf(“HelloWorld.\n”);
printf(“ABC\n”);
printf(“日本語でも大丈夫\n”);
}

CSSの基礎

CSSって？

HTMLの見た目（色・余白・レイアウト・アニメ）を指定するスタイル言語。
重要キーワード：Cascade（優先順位の連なり）、Specificity（詳細度）、Inheritance（継承）。

1) CSSの書き方・読み込み方

<!-- 外部ファイル（推奨） -->
<link rel="stylesheet" href="styles.css">

<!-- ページ内（学習用） -->
<style>
  p { color: #333; }
</style>

<!-- インライン（基本非推奨） -->
<p style="color:#333;">テキスト</p>

2) セレクタの基本

/* タイプ（要素） */      h1 { ... }
/* クラス */             .btn { ... }
/* ID */                 #header { ... }   /* 乱用しない */
 /* 子孫・子・隣接 */    nav a { ... }  nav > a { ... }  h2 + p { ... }
/* 属性 */               input[type="email"] { ... }
/* 擬似クラス */         a:hover, li:nth-child(2) { ... }
/* 擬似要素 */           p::first-line, a::after { content:"→"; }

3) カスケード＆優先度（Specificity）

計算イメージ：ID(100) > class/属性/擬似クラス(10) > 要素/擬似要素(1)
競合したら：後勝ち（後から書いた方が有効）
!importantは最終手段（設計悪化のもと）

4) ボックスモデル（超重要）

margin ─ 外側の余白
border ─ 枠線
padding ─ 内側の余白
content ─ 中身

* { box-sizing: border-box; } /* 幅計算が直感的になる定番 */

5) 単位＆色

単位：px（固定）/ %（相対）/ em（親のfont-size基準）/ rem（ルート基準）/ vw,vh（ビューポート）
→ レスポンシブは rem と % を多用。
色：#222 / rgb(34 34 34) / hsl(210 10% 20%)（HSLは調整しやすい）
変数：--brand: #5865f2; → color: var(--brand);

6) 文字・余白の基本

html { font-size: 16px; }       /* remの基準 */
body { line-height: 1.7; }
h1 { font-size: clamp(1.5rem, 3vw, 2.5rem); } /* 可変サイズ */
p  { margin: 0 0 1rem; }

7) レイアウト：display / Flex / Grid

display

.block { display: block; }        /* 幅いっぱい */
.inline { display: inline; }      /* 行内 */
.inline-block { display:inline-block; }

Flex（1次元レイアウト：横並び・縦中央寄せが得意）

.container {
  display: flex;
  gap: 1rem;
  align-items: center;        /* 交差軸整列（縦） */
  justify-content: space-between; /* 主軸整列（横） */
}
.center {
  display:flex; align-items:center; justify-content:center;
}

Grid（2次元レイアウト：段組が得意）

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr); /* 3列 */
  gap: 1rem;
}

/* レスポンシブな自動詰め */
.auto-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 1rem;
}

8) 位置指定

.box { position: relative; }
.badge {
  position: absolute; top: .5rem; right: .5rem;
}
header { position: sticky; top: 0; } /* スクロール追従 */

9) レスポンシブ（メディアクエリ・コンテナクエリ）

/* 画面幅が768px以上で適用（モバイル優先） */
@media (min-width: 768px) {
  .nav { display: flex; }
}

/* コンテナクエリ（対応ブラウザ増） */
.card { container-type: inline-size; }
@container (min-width: 500px) {
  .card__side-by-side { display:flex; }
}

10) トランジション＆トランスフォーム

.btn {
  transition: transform .2s ease, background-color .2s;
}
.btn:hover {
  transform: translateY(-2px) scale(1.02);
  background: #111;
  color: #fff;
}

11) リセットとベース

/* まずはこれでOKな最小ベース */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
img, video { max-width: 100%; height: auto; display:block; }
button, input, select, textarea { font: inherit; }
:root {
  --bg: #fff; --fg:#222; --muted:#6b7280; --brand:#3b82f6;
}
@media (prefers-color-scheme: dark) {
  :root { --bg:#0b0b0f; --fg:#e5e7eb; --muted:#9ca3af; }
}
body { background: var(--bg); color: var(--fg); line-height:1.7; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

12) すぐ試せるミニページ（HTML+CSS）

<!doctype html>
<html lang="ja">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>CSS基礎デモ</title>
<style>
  * { box-sizing: border-box; }
  body { margin:0; font-family: system-ui, sans-serif; line-height:1.7; }
  header, footer { padding:16px; background:#f5f5f5; }
  .wrap { max-width:960px; margin:24px auto; padding:0 16px; }
  .hero {
    padding: 48px 16px; text-align:center;
    background: linear-gradient(120deg, #e0f2fe, #fde68a);
    border-radius:16px;
  }
  .btn {
    display:inline-block; padding:.75rem 1rem; border-radius:9999px;
    background:#111; color:#fff; transition: transform .2s ease;
  }
  .btn:hover { transform: translateY(-2px); }
  .grid {
    display:grid; gap:1rem;
    grid-template-columns: repeat(auto-fit, minmax(220px,1fr));
    margin-top:24px;
  }
  .card { border:1px solid #e5e7eb; border-radius:12px; padding:16px; }
  .card h3 { margin:.25rem 0 .5rem; }
</style>
</head>
<body>
  <header><div class="wrap"><strong>CSS基礎デモ</strong></div></header>
  <main class="wrap">
    <section class="hero">
      <h1>CSSの基本を掴もう</h1>
      <p>セレクタ / ボックスモデル / Flex / Grid / レスポンシブ</p>
      <a class="btn" href="#cards">カードを見る</a>
    </section>

    <section id="cards" class="grid">
      <article class="card">
        <h3>セレクタ</h3>
        <p>`.class` / `#id` / `a:hover` / `input[type="text"]` …</p>
      </article>
      <article class="card">
        <h3>Flex</h3>
        <p>横並び・中央寄せが簡単。`display:flex; gap:1rem;`</p>
      </article>
      <article class="card">
        <h3>Grid</h3>
        <p>2次元レイアウト。`auto-fit`×`minmax()`が実用的。</p>
      </article>
    </section>
  </main>
  <footer><div class="wrap"><small>&copy; 2025 CSS Demo</small></div></footer>
</body>
</html>

13) つまずきポイント

高さが合わない：親にalign-items: stretchやheight:auto、画像にはdisplay:block。
中央寄せできない：インラインはtext-align:center、ブロックはmargin: 0 auto、Flexならcenter。
崩れる：box-sizing:border-boxにして、余白はgap優先、width指定は最小限。
優先順位に勝てない：セレクタを少しだけ強くする（親クラスを1段増やすなど）。!importantは避ける。

次に進むなら

レイアウト設計：BEM・Utility First（Tailwind的考え方）
モダン機能：subgrid、container queries、logical properties（margin-inlineなど）
パフォーマンス：未使用CSSの削減、content-visibility、will-changeの慎重な活用

HTMLの基礎

HTMLってなに？

Webページの骨組みを作る言語（見出し・段落・画像・リンクなどの構造）。
見た目はCSS、動きはJSが担当。HTMLは“意味と構造”。

まずは雛形（コピペOK）

<!doctype html>
<html lang="ja">
<head>
  <meta charset="utf-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <title>はじめてのHTML</title>
  <meta name="description" content="このページの説明文" />
</head>
<body>
  <h1>こんにちは！</h1>
  <p>これは最小構成のHTML5ページです。</p>
</body>
</html>

よく使う要素（超基本）

見出し：<h1>～<h6>（ページに基本はh1は1つ）
段落：<p>
リンク：<a href="https://example.com">リンク</a>
画像：<img src="img.png" alt="画像の説明">（alt必須）
リスト：<ul><li>…</li></ul> / <ol>…</ol>
強調：<strong>（重要） / <em>（強調）
区切り：<br>（改行は最小限）、<hr>（区切り線）
まとまり：<div>（汎用ブロック）、<span>（汎用インライン）

セマンティック要素（構造をわかりやすく）

header（ヘッダー）
nav（ナビ）
main（主内容は1ページ1つ）
section（章）
article（単体で完結する記事）
aside（補足）
footer（フッター）

属性のキホン

id（一意な識別子）／class（グループ化）
href（リンク先）／src（画像・スクリプト元）
alt（画像代替文）／title（補足ヒント）
target="_blank"はrel="noopener noreferrer"とセットで

フォーム最小例

<form action="/search" method="get">
  <label for="q">検索：</label>
  <input id="q" name="q" type="search" required>
  <button type="submit">送信</button>
</form>

テーブル最小例（表）

<table>
  <thead><tr><th>商品</th><th>価格</th></tr></thead>
  <tbody>
    <tr><td>りんご</td><td>120</td></tr>
    <tr><td>みかん</td><td>100</td></tr>
  </tbody>
</table>

CSS / JS の読み込み

<link rel="stylesheet" href="styles.css">
<script src="app.js" defer></script>

deferはHTML解析後に実行（推奨）。

ちょっとだけ“実践的”なサンプル

<!doctype html>
<html lang="ja">
<head>
  <meta charset="utf-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <title>ミニサイト</title>
  <style>
    body { font-family: system-ui, sans-serif; line-height: 1.7; margin: 0; }
    header, footer { padding: 16px; background: #f5f5f5; }
    nav a { margin-right: 12px; }
    main { max-width: 920px; margin: 24px auto; padding: 0 16px; }
    img { max-width: 100%; height: auto; }
    .card { border: 1px solid #ddd; border-radius: 8px; padding: 16px; }
  </style>
</head>
<body>
  <header>
    <h1>ミニサイト</h1>
    <nav>
      <a href="#about">概要</a>
      <a href="#gallery">ギャラリー</a>
      <a href="#contact">お問い合わせ</a>
    </nav>
  </header>

  <main id="content">
    <section id="about">
      <h2>概要</h2>
      <p>これはHTMLの基本で作ったミニページです。</p>
    </section>

    <section id="gallery">
      <h2>ギャラリー</h2>
      <div class="card">
        <img src="sample.jpg" alt="サンプル画像">
        <p>レスポンシブに画像が縮みます。</p>
      </div>
      <ul>
        <li>箇条書き１</li>
        <li>箇条書き２</li>
      </ul>
    </section>

    <section id="contact">
      <h2>お問い合わせ</h2>
      <form>
        <label for="name">お名前</label><br>
        <input id="name" name="name" required><br><br>
        <label for="msg">メッセージ</label><br>
        <textarea id="msg" name="msg" rows="4"></textarea><br><br>
        <button type="submit">送信</button>
      </form>
    </section>
  </main>

  <footer>
    <small>&copy; 2025 MiniSite</small>
  </footer>

  <script>
    // ごく簡単なJS：ナビをクリックしたらスムーズスクロール
    document.querySelectorAll('nav a').forEach(a => {
      a.addEventListener('click', e => {
        const id = a.getAttribute('href');
        if (id.startsWith('#')) {
          e.preventDefault();
          document.querySelector(id)?.scrollIntoView({ behavior: 'smooth' });
        }
      });
    });
  </script>
</body>
</html>

初心者がつまずきやすいポイント

文字化け→<meta charset="utf-8">を必ず入れる。
スマホで拡大縮小が変→<meta name="viewport" …>を入れる。
画像が大きすぎる→CSSでimg { max-width: 100%; height: auto; }
見出し乱用→h1はページの主題に1回、階層は順序を守る。
altなし→スクリーンリーダー/SEO的にマイナス。必ず書く。

もっと深掘り（フォームのバリデーション、SEO、アクセシビリティ、Flex/Gridレイアウト、コンポーネント化など）もまとめられます。どこから強化したい？（例：フォームをしっかり、レイアウトを学ぶ、CSS設計、JS連携など）

X風サイト.html

<!doctype html>
<html lang="ja">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>X-like UI – Polished (Left-aligned)</title>
<style>
/* ===== Design Tokens ===== */
:root{
  /* colors */
  --bg: #0b0d10;
  --surface: #0e1116;
  --panel: rgba(16,18,24,.75);
  --card: #0f1319;
  --line: #1c2230;          /* single-pixel separators */
  --text: #e7ecf3;
  --muted: #9aa7ba;
  --accent: #1da1f2;
  --accent-2: #7dd3fc;
  --accent-3: #60a5fa;

  /* radius & shadow */
  --r: 14px;
  --shadow-sm: 0 1px 0 rgba(255,255,255,.02) inset, 0 8px 24px rgba(0,0,0,.35);
  --shadow-card: 0 10px 30px rgba(0,0,0,.25);

  /* layout */
  --col-left: 84px;
  --col-center-min: 360px;
  --col-center-max: 720px;
  --col-right-min: 280px;
  --col-right-max: 420px;

  /* NEW: tighter left gutter for center column */
  --gutter-x: 10px;

  /* motion */
  --e1: cubic-bezier(.2,.8,.2,1);
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(29,161,242,.15), transparent 40%),
    radial-gradient(800px 500px at 110% -10%, rgba(96,165,250,.12), transparent 40%),
    var(--bg);
  color:var(--text);
  font:14px/1.55 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Helvetica Neue", Arial;
}

/* focus ring */
:where(a,button,[role="button"],input,textarea,.sb-btn,.ic-btn,.plus,.btn,.btn-ghost,.btn-primary){outline:none}
:where(a,button,[role="button"],input,textarea,.sb-btn,.ic-btn,.plus,.btn,.btn-ghost,.btn-primary):focus-visible{
  box-shadow:0 0 0 3px rgba(29,161,242,.35);
  border-radius:10px;
}

/* ===== Layout ===== */
.app{
  display:grid; gap:0;
  grid-template-columns: var(--col-left) minmax(var(--col-center-min),var(--col-center-max)) minmax(var(--col-right-min),var(--col-right-max));
  height:100%;
  max-width:1280px;
  margin:0 auto;
}
.sidebar{
  position:sticky; top:0; height:100vh;
  backdrop-filter: blur(10px);
  background:linear-gradient(180deg, rgba(16,18,24,.7), rgba(16,18,24,.3));
  /* NOTE: borders are drawn via ::after to avoid subpixel drift */
  padding:10px 8px; display:flex; flex-direction:column; gap:6px;
}
.sb-btn{
  border-radius:999px; padding:12px 14px; cursor:pointer;
  display:flex; align-items:center; gap:14px; transition:background .2s var(--e1), transform .12s var(--e1);
}
.sb-btn:hover{background:rgba(255,255,255,.04)}
.sb-btn:active{transform:translateY(1px)}
.sb-icon{width:28px;height:28px;display:grid;place-items:center;border-radius:999px}
.sb-btn .label{font-weight:700;letter-spacing:.02em}

.compose-fab{
  position:fixed; left:18px; bottom:18px; z-index:50; cursor:pointer;
  border:none; color:#fff; font-weight:800; letter-spacing:.02em;
  border-radius:999px; padding:12px 18px;
  background:linear-gradient(135deg, var(--accent), var(--accent-3));
  box-shadow:0 10px 30px rgba(29,161,242,.35);
  transition: transform .12s var(--e1), filter .2s var(--e1);
}
.compose-fab:hover{filter:brightness(1.05)}
.compose-fab:active{transform:translateY(1px)}
.you-chip{
  position:fixed; left:18px; bottom:84px; width:48px;height:48px;border-radius:999px;
  display:grid;place-items:center;font-weight:900; background:conic-gradient(from 180deg at 50% 50%, #0f629e, #0c3c68 70%, #0f629e);
  color:#fff; border:1px solid rgba(255,255,255,.08);
}

.main{
  position:relative; /* for ::after separator */
  min-height:100vh; background:rgba(0,0,0,.25);
  backdrop-filter: blur(6px);
}
.rightcol{
  padding:14px; position:sticky; top:0; height:100vh; overflow:auto;
}
.searchbar{
  display:flex; align-items:center; gap:10px; padding:10px 14px;
  background:rgba(255,255,255,.04); border:1px solid rgba(255,255,255,.06);
  border-radius:999px;
}

/* ===== Single-pixel separators (no drift) ===== */
.sidebar::after,
.main::after{
  content:"";
  position:absolute; top:0; bottom:0; width:1px; background:var(--line);
  pointer-events:none; z-index:10;
}
.sidebar::after{ right:0; }  /* Sidebar ↔ Main */
.main::after{ right:0; }     /* Main ↔ Right column */

/* ===== Header Tabs ===== */
.header-title{padding:10px var(--gutter-x); font-size:20px; font-weight:900; border-bottom:1px solid var(--line)}
.tabs{
  position:sticky; top:0; z-index:6;
  display:flex; gap:24px; padding:0 var(--gutter-x);        /* <<< tightened left padding */
  background:linear-gradient(180deg, rgba(14,17,22,.8), rgba(14,17,22,.55));
  backdrop-filter: saturate(120%) blur(8px);
  border-bottom:1px solid var(--line);
}
.tab{
  padding:16px 6px; cursor:pointer; color:var(--muted); font-weight:800; border-bottom:3px solid transparent;
  transition:color .2s var(--e1), border-color .2s var(--e1);
}
.tab.active{color:var(--text); border-color:var(--accent)}

/* ===== Composer ===== */
.composer{
  padding:14px var(--gutter-x);                               /* <<< tightened */
  border-bottom:1px solid var(--line); display:flex; gap:12px;
  background:linear-gradient(180deg, rgba(17,22,29,.8), rgba(17,22,29,.4));
}
.avatar{
  width:42px; height:42px; border-radius:999px; display:grid; place-items:center; font-weight:900; letter-spacing:.02em;
  color:#fff; border:1px solid rgba(255,255,255,.08);
  background:radial-gradient(120% 120% at 20% 15%, #1e81c5, #0f2a43 70%);
}
.composer-box{flex:1}
.composer textarea{
  width:100%; min-height:76px; resize:vertical; background:transparent; border:none; color:var(--text);
  outline:none; font-size:18px; caret-color:var(--accent);
}
.reply-scope{color:var(--accent);font-weight:700;font-size:13px}
.row{display:flex; align-items:center; justify-content:space-between; gap:12px; margin-top:6px}
.icons{display:flex; gap:8px}
.ic-btn{width:32px;height:32px;display:grid;place-items:center;border-radius:10px;cursor:pointer;transition:background .2s}
.ic-btn:hover{background:rgba(255,255,255,.06)}
.post-btn{
  border:none; color:#0b1220; font-weight:900; letter-spacing:.02em;
  padding:9px 18px; border-radius:999px; cursor:not-allowed;
  background:linear-gradient(135deg, #6b7280 0%, #9aa7ba 100%);
  filter:saturate(.7); opacity:.7; transition:filter .2s, transform .12s;
}
.post-btn.enabled{
  cursor:pointer; opacity:1; color:#fff; filter:none;
  background:linear-gradient(135deg, var(--accent), var(--accent-3));
  box-shadow:0 12px 30px rgba(29,161,242,.3);
}
.post-btn.enabled:hover{filter:brightness(1.05)}
.post-btn.enabled:active{transform:translateY(1px)}

/* ===== Cards ===== */
.card{
  border-bottom:1px solid var(--line); display:flex; gap:12px;
  padding:14px var(--gutter-x);                                 /* <<< tightened */
  background:linear-gradient(180deg, rgba(16,20,27,.5), rgba(16,20,27,.25));
}
.meta{display:flex; gap:6px; color:var(--muted)}
.name{font-weight:900}
.handle{color:var(--muted)}
.hash a{color:var(--accent)}
.post-img{
  border-radius:18px; border:1px solid rgba(255,255,255,.06); width:100%; margin-top:10px;
  box-shadow:var(--shadow-card)
}
.actions{display:flex; gap:26px; margin-top:8px; color:var(--muted)}
.action{display:flex; gap:6px; align-items:center; cursor:pointer; transition:color .15s}
.action:hover{color:var(--accent)}

/* ===== Right column ===== */
.rightcol .rc-card{
  background:linear-gradient(180deg, rgba(17,22,29,.65), rgba(17,22,29,.35));
  border:1px solid rgba(255,255,255,.08); border-radius:18px; overflow:hidden; margin-top:12px; box-shadow:var(--shadow-sm)
}
.rc-title{font-weight:900; padding:12px 16px; border-bottom:1px solid rgba(255,255,255,.06)}
.rc-item{padding:12px 16px; border-top:1px solid rgba(255,255,255,.04)}
.chip{background:linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.02)); border:1px solid rgba(255,255,255,.08);
  padding:4px 10px; border-radius:999px; color:var(--muted); font-size:12px}

/* ===== Subtabs / Explore ===== */
.subtabs{display:flex; gap:18px; padding:10px var(--gutter-x); border-bottom:1px solid var(--line); background:rgba(255,255,255,.02)}  /* <<< tightened */
.subtab{padding:10px 2px; color:var(--muted); font-weight:800; cursor:pointer; border-bottom:3px solid transparent}
.subtab.active{color:var(--text); border-color:var(--accent)}

/* ===== Empties / Profile / Lists ===== */
.empty{display:grid; place-items:center; padding:72px var(--gutter-x); color:var(--muted); text-align:center}
.empty h2{margin:0 0 6px; color:var(--text)}
.cover{height:170px; background:
  radial-gradient(70% 120% at 10% 0%, rgba(29,161,242,.25), transparent 40%),
  radial-gradient(60% 120% at 100% 0%, rgba(96,165,250,.2), transparent 40%),
  linear-gradient(180deg,#121722,#0b0f17)}
.prof-wrap{padding:0 var(--gutter-x) 16px}
.prof-row{display:flex; justify-content:space-between; align-items:end; margin-top:-36px}
.pfp{width:96px;height:96px;border-radius:999px;border:4px solid var(--surface);background:radial-gradient(120% 120% at 20% 15%, #1e81c5, #0f2a43 70%);display:grid;place-items:center;color:#fff;font-weight:900}
.btn{background:transparent; border:1px solid rgba(255,255,255,.18); color:#fff; border-radius:999px; padding:8px 14px; cursor:pointer; transition:background .2s}
.btn:hover{background:rgba(255,255,255,.05)}
.alert{background:rgba(18,42,24,.65); border:1px solid #165c36; color:#a9f2b7; border-radius:14px; padding:12px 14px; margin:12px var(--gutter-x); display:flex; gap:10px; align-items:center}
.check{width:18px;height:18px;border-radius:4px;border:2px solid #a9f2b7;display:grid;place-items:center}

.list-row{display:flex; align-items:center; justify-content:space-between; gap:12px; padding:12px 16px}
.list-pill{width:44px;height:44px;border-radius:12px; background:linear-gradient(135deg,#374151,#1f2937)}
.plus{width:28px;height:28px;border-radius:999px;border:1px solid rgba(255,255,255,.18);display:grid;place-items:center}

/* ===== Grok ===== */
.grok{display:grid; place-items:center; padding:44px var(--gutter-x)}
.grok .logo{font-size:28px; font-weight:1000; display:flex; align-items:center; gap:10px}
.grok .input{margin-top:18px; display:flex; gap:8px; width:min(680px,90vw)}
.grok .input input{flex:1; padding:14px; border-radius:12px; border:1px solid rgba(255,255,255,.18); background:#0c1118; color:#fff; transition:border .2s}
.grok .input input:focus{border-color:rgba(125,211,252,.6)}
.grok .input button{padding:12px 16px; border-radius:12px; border:1px solid rgba(255,255,255,.18); background:linear-gradient(135deg,#10151f,#0e131b); color:#fff}
.grok .tools{display:flex; gap:8px; margin-top:12px}

/* ===== E2EE Page ===== */
.e2ee{padding:56px var(--gutter-x); text-align:center}
.e2ee h1{font-size:26px; margin:0 0 12px}
.bullet{display:flex; gap:10px; align-items:flex-start; justify-content:center; color:#cfd9ea}
.e2ee .cta{display:flex; gap:12px; justify-content:center; margin-top:18px}
.btn-ghost{border:1px solid rgba(255,255,255,.18); background:transparent; color:#fff; padding:10px 14px; border-radius:999px}
.btn-primary{border:1px solid rgba(29,161,242,.55); background:linear-gradient(135deg, var(--accent), var(--accent-2)); color:#001e33; font-weight:900; padding:10px 16px; border-radius:999px}

/* ===== Modal ===== */
.modal-backdrop{
  position:fixed; inset:0; background:rgba(4,8,12,.6); display:none; align-items:center; justify-content:center; z-index:100;
  animation:fadeIn .2s var(--e1);
}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
.modal{
  width:min(640px,92vw); background:linear-gradient(180deg, rgba(14,18,24,.95), rgba(14,18,24,.85));
  border:1px solid rgba(255,255,255,.12); border-radius:20px; overflow:hidden; box-shadow:var(--shadow-card)
}
.modal .top{display:flex; align-items:center; justify-content:space-between; padding:10px 14px; border-bottom:1px solid rgba(255,255,255,.06)}
.close-x{width:32px;height:32px;border-radius:999px;display:grid;place-items:center;cursor:pointer;transition:background .2s}
.close-x:hover{background:rgba(255,255,255,.06)}
.small{font-size:12px;color:var(--muted)}

/* ===== Toast ===== */
.toast{
  position:fixed; left:50%; transform:translateX(-50%) translateY(20px);
  bottom:20px; background:rgba(18,22,28,.92); border:1px solid rgba(255,255,255,.12);
  padding:10px 14px; border-radius:999px; display:none; gap:10px; align-items:center; z-index:120;
  box-shadow:var(--shadow-card); animation:slideUp .25s var(--e1);
}
.toast .view{background:rgba(255,255,255,.06); border:1px solid rgba(255,255,255,.12); padding:6px 10px; border-radius:999px}
@keyframes slideUp{from{opacity:0; transform:translateX(-50%) translateY(40px)} to{opacity:1; transform:translateX(-50%) translateY(0)}}

/* ===== Utilities ===== */
.hide{display:none !important}

/* ===== Responsive ===== */
@media (max-width:1100px){
  .app{grid-template-columns: 72px 1fr}
  .rightcol{display:none}
}
@media (max-width:520px){
  .sb-btn .label{display:none}
  .sidebar{align-items:center}
}
</style>
</head>
<body>
<div class="app">
  <!-- Sidebar -->
  <aside class="sidebar" aria-label="Sidebar">
    <div class="sb-btn" data-nav="home"><div class="sb-icon">🏠</div><div class="label">Home</div></div>
    <div class="sb-btn" data-nav="explore"><div class="sb-icon">🔎</div><div class="label">Explore</div></div>
    <div class="sb-btn" data-nav="notifications"><div class="sb-icon">🔔</div><div class="label">Notifications</div></div>
    <div class="sb-btn" data-nav="messages"><div class="sb-icon">✉️</div><div class="label">Messages</div></div>
    <div class="sb-btn" data-nav="grok"><div class="sb-icon">⚡</div><div class="label">Grok</div></div>
    <div class="sb-btn" data-nav="lists"><div class="sb-icon">🗂️</div><div class="label">Lists</div></div>
    <div class="sb-btn" data-nav="profile"><div class="sb-icon">👤</div><div class="label">Profile</div></div>
    <div class="sb-btn" data-nav="encrypted"><div class="sb-icon">🔒</div><div class="label">Chat</div></div>
  </aside>

  <!-- Main -->
  <main class="main" id="main">
    <!-- Home -->
    <section id="view-home" role="region" aria-label="Home timeline">
      <div class="tabs">
        <div class="tab active" data-home-tab="foryou">For you</div>
        <div class="tab" data-home-tab="following">Following</div>
      </div>

      <div class="composer">
        <div class="avatar">裕平</div>
        <div class="composer-box">
          <div class="reply-scope">Everyone can reply</div>
          <textarea id="compose-input" placeholder="What’s happening?"></textarea>
          <div class="row">
            <div class="icons" aria-label="Composer actions">
              <div class="ic-btn" title="Media">🖼️</div>
              <div class="ic-btn" title="GIF">🌀</div>
              <div class="ic-btn" title="Poll">📊</div>
              <div class="ic-btn" title="Emoji">😊</div>
              <div class="ic-btn" title="Schedule">🗓️</div>
              <div class="ic-btn" title="Location">📍</div>
            </div>
            <button id="post-btn" class="post-btn" disabled>Post</button>
          </div>
        </div>
      </div>

      <article class="card">
        <div class="avatar">H</div>
        <div style="flex:1">
          <div class="meta"><span class="name">HANA</span><span class="handle">@HANA__BRAVE · 9h</span></div>
          <div>🎂 <span class="hash"><a href="#">#HAPPYJISOODAY</a></span><br/>Happy Birthday JISOO 🤍<br/><span class="hash"><a href="#">#HANA</a> <a href="#">#JISOO</a></span></div>
          <img class="post-img" alt="sample" src="https://picsum.photos/seed/jisoo/720/380" />
          <div class="actions">
            <div class="action">💬 <span>24</span></div>
            <div class="action">🔁 <span>10</span></div>
            <div class="action">❤️ <span>128</span></div>
            <div class="action">↗️</div>
          </div>
        </div>
      </article>

      <article class="card">
        <div class="avatar">X</div>
        <div style="flex:1">
          <div class="meta"><span class="name">MTV VMA · LIVE</span><span class="handle"> · now</span></div>
          <div class="hash"><a href="#">#VMAs</a></div>
          <img class="post-img" alt="vmas" src="https://picsum.photos/seed/vma/720/300" />
          <div class="actions">
            <div class="action">💬 <span>8</span></div>
            <div class="action">🔁 <span>3</span></div>
            <div class="action">❤️ <span>42</span></div>
            <div class="action">↗️</div>
          </div>
        </div>
      </article>

      <div id="feed-anchor"></div>
    </section>

    <!-- Explore -->
    <section id="view-explore" class="hide" role="region" aria-label="Explore">
      <div class="header-title">
        <div class="searchbar"><span>🔎</span><input style="flex:1;background:transparent;border:none;color:#fff;outline:none" placeholder="Search" /></div>
      </div>
      <div class="subtabs">
        <div class="subtab active">For You</div>
        <div class="subtab">Trending</div>
        <div class="subtab">News</div>
        <div class="subtab">Sports</div>
        <div class="subtab">Entertainment</div>
      </div>
      <article class="card">
        <div class="avatar">T</div>
        <div style="flex:1">
          <div class="meta"><span class="name">Tokyo 2025</span><span class="handle"> · promoted</span></div>
          <img class="post-img" alt="tokyo" src="https://picsum.photos/seed/tokyo2025/720/260" />
        </div>
      </article>
    </section>

    <!-- Notifications -->
    <section id="view-notifications" class="hide" role="region" aria-label="Notifications">
      <div class="tabs">
        <div class="tab active">All</div>
        <div class="tab">Verified</div>
        <div class="tab">Mentions</div>
      </div>
      <div class="empty">
        <div>
          <h2>Nothing to see here — yet</h2>
          <div>From likes to reposts and a whole lot more, this is where all the action happens.</div>
        </div>
      </div>
    </section>

    <!-- Messages -->
    <section id="view-messages" class="hide" role="region" aria-label="Messages">
      <div class="inbox" style="min-height:60vh">
        <div class="dm-left" style="border-right:1px solid var(--line)">
          <div style="padding:16px">
            <h3 style="margin:4px 0">Welcome to your inbox!</h3>
            <div class="muted">Drop a line, share posts and more with private conversations between you and others on X.</div>
            <div style="height:10px"></div>
            <button class="btn">Write a message</button>
          </div>
        </div>
        <div>
          <div class="empty">
            <div>
              <h2>Select a message</h2>
              <div class="muted">Choose from your existing conversations, start a new one, or just keep swimming.</div>
              <div style="height:10px"></div>
              <button class="btn">New message</button>
            </div>
          </div>
        </div>
      </div>
    </section>

    <!-- Lists -->
    <section id="view-lists" class="hide" role="region" aria-label="Lists">
      <div class="header-title">Lists</div>
      <div style="padding:16px">
        <div class="muted" style="padding:8px 16px">Discover new Lists</div>
        <div class="rc-card" role="list">
          <div class="list-row">
            <div style="display:flex;gap:12px;align-items:center">
              <div class="list-pill"></div>
              <div>
                <div>J.League · <span class="muted">60 members</span></div>
                <div class="muted">2K followers including @sascha348</div>
              </div>
            </div>
            <div class="plus">＋</div>
          </div>
          <div class="list-row">
            <div style="display:flex;gap:12px;align-items:center">
              <div class="list-pill"></div>
              <div>
                <div>Official Accounts · <span class="muted">83 members</span></div>
                <div class="muted">263 followers including @dencetuno</div>
              </div>
            </div>
            <div class="plus">＋</div>
          </div>
          <div class="list-row">
            <div style="display:flex;gap:12px;align-items:center">
              <div class="list-pill"></div>
              <div>
                <div>kitchen · <span class="muted">52 members</span></div>
                <div class="muted">181 followers including @Carolina_3254</div>
              </div>
            </div>
            <div class="plus">＋</div>
          </div>
        </div>

        <div class="muted" style="padding:22px 16px 8px">Your Lists</div>
        <div class="empty" style="opacity:.75"><div>You haven't created or followed any Lists. When you do, they'll show up here.</div></div>
      </div>
    </section>

    <!-- Profile -->
    <section id="view-profile" class="hide" role="region" aria-label="Profile">
      <div class="cover"></div>
      <div class="prof-wrap">
        <div class="prof-row">
          <div class="pfp">裕平</div>
          <button class="btn">Edit profile</button>
        </div>
        <h2 style="margin:10px 0 0">長留裕平</h2>
        <div class="muted">@PingZhang89719 · Joined September 2025</div>
        <div style="height:8px"></div>
        <div class="muted">0 Following · 0 Followers</div>
      </div>
      <div class="alert">
        <div class="check">✔</div>
        <div>
          <div class="name" style="font-weight:900">You aren’t verified yet</div>
          <div class="muted">Get verified for boosted replies, analytics, ad-free browsing, and more.</div>
        </div>
      </div>
      <article class="card">
        <div class="avatar">裕平</div>
        <div style="flex:1">
          <div class="meta"><span class="name">長留裕平</span><span class="handle"> · 1m</span></div>
          <div>はじめました。</div>
        </div>
      </article>
    </section>

    <!-- Grok -->
    <section id="view-grok" class="hide" role="region" aria-label="Grok">
      <div class="grok">
        <div class="logo">⚡ <span>Grok</span></div>
        <div class="muted">Ask anything</div>
        <div class="input">
          <input placeholder="Ask anything" />
          <button>➤</button>
        </div>
        <div class="tools">
          <button class="btn">Create Images</button>
          <button class="btn">Edit Image</button>
        </div>
        <div class="muted" style="margin-top:16px">Fast ▾ &nbsp; · &nbsp; History</div>
      </div>
    </section>

    <!-- Encrypted Chat -->
    <section id="view-encrypted" class="hide" role="region" aria-label="Encrypted Chat">
      <div class="e2ee">
        <h1>Meet new Chat, now fully encrypted.</h1>
        <div class="muted">X Chat are now protected with end-to-end encryption on all your devices.</div>
        <div style="height:12px"></div>
        <div class="bullet">🔒 <div><b>End-to-End Encryption</b><br/>Your messages are protected across devices.</div></div>
        <div class="bullet">🛡️ <div><b>Uncompromising Privacy</b><br/>No one — not even X — can access or read your messages.</div></div>
        <div class="cta">
          <button class="btn-ghost">Maybe later</button>
          <button class="btn-primary">Set up now</button>
        </div>
      </div>
    </section>
  </main>

  <!-- Right -->
  <aside class="rightcol" aria-label="Right column">
    <div class="rc-card">
      <div class="rc-title">What’s happening</div>
      <div class="rc-item"><b>MTV Video Music Awards 2025</b><div class="muted">LIVE</div></div>
      <div class="rc-item"><b>東京2025 世界陸上</b><div class="muted">Trending · 8,724 posts</div></div>
      <div class="rc-item"><b>JISOO</b><div class="chip">K-POP · Trending</div></div>
    </div>
    <div class="rc-card">
      <div class="rc-title">Who to follow</div>
      <div class="rc-item">🅿️ <b>Product Dev</b> · <span class="muted">@buildhub</span> <button class="btn" style="float:right">Follow</button></div>
      <div class="rc-item">🧠 <b>AI Lab</b> · <span class="muted">@ailab</span> <button class="btn" style="float:right">Follow</button></div>
    </div>
  </aside>
</div>

<!-- Floating -->
<button class="compose-fab" id="open-compose">Post</button>
<div class="you-chip">裕平</div>

<!-- Modal -->
<div class="modal-backdrop" id="composer-modal" aria-hidden="true">
  <div class="modal" role="dialog" aria-modal="true" aria-label="New post">
    <div class="top">
      <div class="close-x" id="close-compose">✕</div>
      <a class="small" href="#" id="drafts-link">Drafts</a>
    </div>
    <div class="composer" style="border:none">
      <div class="avatar">裕平</div>
      <div class="composer-box">
        <div class="reply-scope">Everyone can reply</div>
        <textarea id="modal-input" placeholder="What’s happening?"></textarea>
        <div class="row">
          <div class="icons">
            <div class="ic-btn">🖼️</div><div class="ic-btn">🌀</div><div class="ic-btn">📊</div><div class="ic-btn">😊</div><div class="ic-btn">🗓️</div><div class="ic-btn">📍</div>
          </div>
          <button id="modal-post" class="post-btn" disabled>Post</button>
        </div>
      </div>
    </div>
  </div>
</div>

<!-- Toast -->
<div class="toast" id="toast">
  <div>✅ Your post was sent.</div>
  <a class="view" href="#feed-anchor">View</a>
</div>

<script>
/* ---------- Router ---------- */
const views = {
  home: document.getElementById('view-home'),
  explore: document.getElementById('view-explore'),
  notifications: document.getElementById('view-notifications'),
  messages: document.getElementById('view-messages'),
  lists: document.getElementById('view-lists'),
  profile: document.getElementById('view-profile'),
  grok: document.getElementById('view-grok'),
  encrypted: document.getElementById('view-encrypted'),
};
function show(view){
  for(const k in views){ views[k].classList.add('hide'); }
  (views[view]||views.home).classList.remove('hide');
  window.location.hash = view;
}
document.querySelectorAll('.sb-btn').forEach(btn=>{
  btn.addEventListener('click', ()=>show(btn.dataset.nav));
});
window.addEventListener('load', ()=>{
  const v = location.hash.replace('#','');
  if(v && views[v]) show(v);
});

/* ---------- Composer (inline) ---------- */
const composeInput = document.getElementById('compose-input');
const postBtn = document.getElementById('post-btn');
composeInput.addEventListener('input',()=>{
  const on = composeInput.value.trim().length>0;
  postBtn.disabled = !on; postBtn.classList.toggle('enabled', on);
});
postBtn.addEventListener('click', ()=>{
  addPost(composeInput.value.trim());
  composeInput.value=''; postBtn.disabled=true; postBtn.classList.remove('enabled');
  showToast();
});

/* ---------- Composer (modal) ---------- */
const modal = document.getElementById('composer-modal');
const openCompose = document.getElementById('open-compose');
const closeCompose = document.getElementById('close-compose');
const modalInput = document.getElementById('modal-input');
const modalPost = document.getElementById('modal-post');

openCompose.addEventListener('click', ()=>{ modal.style.display='flex'; modalInput.focus(); });
closeCompose.addEventListener('click', ()=>{ modal.style.display='none'; });

modalInput.addEventListener('input', ()=>{
  const on = modalInput.value.trim().length>0;
  modalPost.disabled = !on; modalPost.classList.toggle('enabled', on);
});
modalPost.addEventListener('click', ()=>{
  addPost(modalInput.value.trim());
  modalInput.value=''; modalPost.disabled=true; modalPost.classList.remove('enabled');
  modal.style.display='none'; showToast();
});
modal.addEventListener('click', (e)=>{ if(e.target===modal) modal.style.display='none'; });

/* ---------- Add Post ---------- */
function addPost(text){
  if(!text) return;
  const card = document.createElement('article');
  card.className='card';
  card.innerHTML = `
    <div class="avatar">裕平</div>
    <div style="flex:1">
      <div class="meta"><span class="name">長留裕平</span><span class="handle"> · now</span></div>
      <div>${escapeHTML(text)}</div>
      <div class="actions">
        <div class="action">💬 <span>0</span></div>
        <div class="action">🔁 <span>0</span></div>
        <div class="action">❤️ <span>0</span></div>
        <div class="action">↗️</div>
      </div>
    </div>`;
  const anchor = document.getElementById('feed-anchor');
  anchor.parentNode.insertBefore(card, anchor);
}
function escapeHTML(s){return s.replaceAll('&','&amp;').replaceAll('<','&lt;').replaceAll('>','&gt;')}

/* ---------- Toast ---------- */
const toast = document.getElementById('toast');
function showToast(){
  toast.style.display='flex';
  clearTimeout(showToast._t);
  showToast._t = setTimeout(()=> toast.style.display='none', 2600);
}

/* ---------- Home tab visual only ---------- */
document.querySelectorAll('[data-home-tab]').forEach(t=>{
  t.addEventListener('click', ()=>{
    document.querySelectorAll('[data-home-tab]').forEach(x=>x.classList.remove('active'));
    t.classList.add('active');
  });
});
</script>
</body>
</html>

MailLite — シンプルWebメール

<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>MailLite — シンプルWebメール</title>
<style>
  :root{
    --bg:#f6f7fb;
    --panel:#ffffff;
    --text:#1f2937;
    --muted:#6b7280;
    --primary:#4f46e5;
    --primary-weak:#eef2ff;
    --border:#e5e7eb;
    --danger:#ef4444;
    --success:#10b981;
    --warning:#f59e0b;
  }
  .dark{
    --bg:#0b0e15;
    --panel:#0f1623;
    --text:#e5e7eb;
    --muted:#9ca3af;
    --primary:#8b5cf6;
    --primary-weak:#221a36;
    --border:#1f2937;
    --danger:#f87171;
    --success:#34d399;
    --warning:#fbbf24;
  }
  *{box-sizing:border-box}
  html,body{height:100%}
  body{
    margin:0;background:var(--bg);color:var(--text);
    font:14px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,"Noto Sans JP",sans-serif;
  }
  .app{
    display:grid;grid-template-rows:56px 1fr;height:100%;
  }
  /* Topbar */
  .topbar{
    display:flex;align-items:center;gap:12px;
    padding:0 16px;border-bottom:1px solid var(--border);background:var(--panel);
    position:sticky;top:0;z-index:5;
  }
  .logo{
    display:flex;align-items:center;gap:10px;font-weight:700;
    letter-spacing:.2px;
  }
  .badge{font-size:10px;padding:2px 6px;border-radius:999px;background:var(--primary-weak);color:var(--primary)}
  .search{
    margin-left:auto;display:flex;align-items:center;gap:8px;background:var(--bg);
    padding:6px 10px;border-radius:10px;border:1px solid var(--border);min-width:220px;max-width:460px;flex:1;
  }
  .search input{border:none;background:transparent;outline:none;color:var(--text);width:100%}
  .icon{width:18px;height:18px;display:inline-block;flex:0 0 18px}
  .btn{
    display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:10px;
    border:1px solid var(--border);background:var(--panel);cursor:pointer;color:var(--text);
  }
  .btn.primary{background:var(--primary);border-color:var(--primary);color:#fff}
  .btn.ghost{background:transparent}
  .btn:disabled{opacity:.6;cursor:not-allowed}

  /* Layout */
  .layout{
    display:grid;grid-template-columns:260px 360px 1fr;gap:12px;padding:12px;height:calc(100vh - 56px);
  }
  .panel{background:var(--panel);border:1px solid var(--border);border-radius:14px;overflow:hidden;display:flex;flex-direction:column;min-height:0}
  .sidebar{padding:12px}
  .compose-block{padding:12px}
  .compose-button{width:100%;justify-content:center}
  .nav-group{margin-top:8px}
  .nav-item{
    display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:10px;color:var(--text);text-decoration:none;cursor:pointer;
  }
  .nav-item:hover{background:var(--primary-weak)}
  .nav-item.active{background:var(--primary);color:#fff}
  .nav-item .count{margin-left:auto;opacity:.8}

  /* List */
  .list-toolbar{display:flex;align-items:center;gap:8px;padding:8px;border-bottom:1px solid var(--border)}
  .list{overflow:auto}
  .msg{
    display:grid;grid-template-columns:24px 1fr auto;gap:10px;padding:12px;border-bottom:1px solid var(--border);cursor:pointer;
  }
  .msg:hover{background:var(--primary-weak)}
  .msg.unread{background:linear-gradient(0deg,transparent,transparent), var(--panel);font-weight:600}
  .msg .from{color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .msg .subject{color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .msg .snippet{color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .msg .meta{display:flex;flex-direction:column;align-items:end;gap:4px;color:var(--muted)}
  .chip{display:inline-flex;align-items:center;gap:6px;padding:2px 8px;border-radius:999px;border:1px solid var(--border);font-size:11px}
  .star{cursor:pointer;opacity:.7}
  .star.active{opacity:1}
  .avatar{
    width:24px;height:24px;border-radius:50%;background:linear-gradient(135deg,var(--primary),#22c1c3);
    display:grid;place-items:center;color:#fff;font-size:12px;font-weight:700;
  }

  /* Reader */
  .reader-head{
    padding:12px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:12px;flex-wrap:wrap;
  }
  .reader-title{font-size:18px;font-weight:700}
  .reader-meta{color:var(--muted);font-size:12px}
  .reader-actions{margin-left:auto;display:flex;gap:8px}
  .reader-body{padding:16px;overflow:auto}
  .empty{display:grid;place-items:center;height:100%;color:var(--muted)}

  /* Modal */
  .modal{
    position:fixed;inset:0;background:rgba(0,0,0,.4);display:none;align-items:center;justify-content:center;z-index:20;
  }
  .modal.open{display:flex}
  .modal-card{
    width:min(920px,94vw);max-height:88vh;overflow:auto;background:var(--panel);border:1px solid var(--border);
    border-radius:16px;
  }
  .modal-head{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--border)}
  .modal-body{padding:16px;display:grid;gap:10px}
  .field{display:grid;gap:6px}
  .input, textarea{
    width:100%;padding:10px 12px;border-radius:10px;border:1px solid var(--border);
    background:transparent;color:var(--text);outline:none;
  }
  textarea{min-height:220px;resize:vertical}
  .row{display:flex;gap:10px;flex-wrap:wrap}
  .grow{flex:1}

  /* Responsive */
  @media (max-width: 1100px){
    .layout{grid-template-columns:220px 1fr}
    .reader{display:none}
    .layout.show-reader .list{display:none}
    .layout.show-reader .reader{display:flex}
  }
  @media (max-width: 640px){
    .layout{grid-template-columns:1fr}
    .sidebar{display:none}
  }
</style>
</head>
<body>
<div class="app">
  <!-- Topbar -->
  <div class="topbar">
    <div class="logo">
      <svg class="icon" viewBox="0 0 24 24" fill="none" aria-hidden="true">
        <path d="M3 7.5 12 13l9-5.5v9A2.5 2.5 0 0 1 18.5 19h-13A2.5 2.5 0 0 1 3 16.5v-9Z" stroke="currentColor" stroke-width="1.5"/>
        <path d="m3 7.5 9-5 9 5" stroke="currentColor" stroke-width="1.5"/>
      </svg>
      MailLite <span class="badge">beta</span>
    </div>

    <div class="search">
      <svg class="icon" viewBox="0 0 24 24" fill="none"><path d="m21 21-4.2-4.2" stroke="currentColor" stroke-width="1.5" stroke-linecap="round"/><circle cx="11" cy="11" r="7" stroke="currentColor" stroke-width="1.5"/></svg>
      <input id="search" placeholder="メールを検索（差出人・件名・本文・ラベル）" />
      <button class="btn ghost" id="clearSearch" title="検索クリア">クリア</button>
    </div>

    <button class="btn" id="toggleDark" title="ダークモード">
      <svg class="icon" viewBox="0 0 24 24" fill="none"><path d="M12 3a9 9 0 1 0 9 9 7 7 0 0 1-9-9Z" stroke="currentColor" stroke-width="1.5"/></svg>
      主题
    </button>
    <button class="btn primary" id="composeBtn">
      <svg class="icon" viewBox="0 0 24 24" fill="none"><path d="M4 20h16M6 14l9.5-9.5a2.1 2.1 0 1 1 3 3L9 17l-5 1 2-4Z" stroke="#fff" stroke-width="1.5" stroke-linejoin="round"/></svg>
      新規作成
    </button>
  </div>

  <!-- Main layout -->
  <div class="layout" id="layout">
    <!-- Sidebar -->
    <aside class="panel sidebar">
      <div class="compose-block">
        <button class="btn primary compose-button" id="composeBtn2">
          <svg class="icon" viewBox="0 0 24 24" fill="none"><path d="M4 20h16M6 14l9.5-9.5a2.1 2.1 0 1 1 3 3L9 17l-5 1 2-4Z" stroke="#fff" stroke-width="1.5" stroke-linejoin="round"/></svg>
          新規メール
        </button>
      </div>
      <nav class="nav-group" id="folders"></nav>
    </aside>

    <!-- List -->
    <section class="panel">
      <div class="list-toolbar">
        <button class="btn" id="markReadBtn" title="既読にする">既読</button>
        <button class="btn" id="markUnreadBtn" title="未読にする">未読</button>
        <button class="btn" id="archiveBtn" title="アーカイブ">アーカイブ</button>
        <button class="btn" id="deleteBtn" title="削除">削除</button>
        <div style="margin-left:auto;display:flex;align-items:center;gap:6px;">
          <span class="chip"><span class="dot" style="width:8px;height:8px;border-radius:50%;background:var(--primary)"></span> ラベル</span>
        </div>
      </div>
      <div class="list" id="list"></div>
    </section>

    <!-- Reader -->
    <section class="panel reader" id="reader">
      <div class="empty" id="emptyState">メールを選択してください</div>
      <div style="display:none;flex-direction:column;height:100%;" id="readerWrap">
        <div class="reader-head">
          <div style="display:flex;align-items:center;gap:10px;min-width:0">
            <div class="avatar" id="readerAvatar">Y</div>
            <div style="min-width:0">
              <div class="reader-title" id="readerSubject">件名</div>
              <div class="reader-meta" id="readerMeta">From – To ・ 日付</div>
            </div>
          </div>
          <div class="reader-actions">
            <button class="btn" id="replyBtn" title="返信">返信</button>
            <button class="btn" id="starBtn" title="スター">
              <span id="starIcon">☆</span> スター
            </button>
            <button class="btn" id="archBtn" title="アーカイブ">アーカイブ</button>
            <button class="btn" id="trashBtn" title="削除" style="color:var(--danger)">削除</button>
          </div>
        </div>
        <div class="reader-body">
          <div id="readerBody"></div>
        </div>
      </div>
    </section>
  </div>
</div>

<!-- Compose Modal -->
<div class="modal" id="composeModal" aria-hidden="true">
  <div class="modal-card">
    <div class="modal-head">
      <strong>新規メッセージ</strong>
      <div class="row">
        <button class="btn" id="saveDraftBtn">下書き保存</button>
        <button class="btn primary" id="sendBtn">送信</button>
        <button class="btn" id="closeModalBtn">閉じる</button>
      </div>
    </div>
    <div class="modal-body">
      <div class="row">
        <div class="field grow">
          <label for="to">宛先（カンマ区切り）</label>
          <input class="input" id="to" placeholder="example@example.com, someone@domain.jp" />
        </div>
        <div class="field" style="min-width:160px;">
          <label for="label">ラベル</label>
          <input class="input" id="label" placeholder="work, personal など" />
        </div>
      </div>
      <div class="field">
        <label for="subject">件名</label>
        <input class="input" id="subject" placeholder="件名を入力" />
      </div>
      <div class="field">
        <label for="body">本文</label>
        <textarea id="body" placeholder="本文を入力"></textarea>
      </div>
    </div>
  </div>
</div>

<script>
/** ======= Simple Mail App (no backend) ======= */
const DB_KEY = "maillite-db-v1";
const QS = sel => document.querySelector(sel);
const QSA = sel => [...document.querySelectorAll(sel)];
const state = {
  currentFolder: "inbox",
  query: "",
  selectedIds: new Set(),
  currentId: null,
  db: { messages: [] }
};
const FOLDERS = [
  {id:"inbox",   name:"受信箱",    icon:"📥"},
  {id:"starred", name:"スター",    icon:"⭐"},
  {id:"sent",    name:"送信済み",  icon:"📤"},
  {id:"drafts",  name:"下書き",    icon:"📝"},
  {id:"archive", name:"アーカイブ",icon:"🗄️"},
  {id:"spam",    name:"迷惑",      icon:"🚫"},
  {id:"trash",   name:"ゴミ箱",    icon:"🗑️"},
];

function initDB(){
  const saved = localStorage.getItem(DB_KEY);
  if(saved){
    state.db = JSON.parse(saved);
    return;
  }
  // Seed sample messages
  const now = Date.now();
  const demo = [
    mkMsg("suzuki@example.com","ようこそ MailLite へ","MailLite をお試しいただきありがとうございます！\n\nこのメールはデモです。",["welcome"], now-3600_000),
    mkMsg("shop@ec.example.com","【お知らせ】サマーセール開催！","最大 50%OFF。今すぐチェック！",["promo"], now-7200_000),
    mkMsg("boss@company.jp","明日の打合せ議題","・リリース計画\n・障害対応\n・コスト見直し",["work"], now-86400_000, true),
    mkMsg("friend@chat.jp","週末の予定どう？","映画かカラオケ行かない？",["personal"], now-5400_000),
    mkMsg("security@service.jp","ログイン通知","新しい端末からログインがありました。",["security"], now-9600_000),
  ];
  demo[2].unread = false;
  state.db.messages = demo;
  persist();
}
function mkMsg(from, subject, body, labels=[], time=Date.now(), starred=false){
  const id = crypto.randomUUID();
  const initials = (from.split("@")[0][0]||"U").toUpperCase();
  return {
    id, box:"inbox", from, to:[], subject, body, labels, starred, unread:true,
    date: time, initials
  };
}
function persist(){ localStorage.setItem(DB_KEY, JSON.stringify(state.db)); }

function formatDate(ts){
  const d = new Date(ts);
  const pad = n => String(n).padStart(2,"0");
  return `${d.getFullYear()}/${pad(d.getMonth()+1)}/${pad(d.getDate())} ${pad(d.getHours())}:${pad(d.getMinutes())}`;
}

// Render folders
function renderFolders(){
  const el = QS("#folders");
  el.innerHTML = "";
  for(const f of FOLDERS){
    const count = countFolder(f.id);
    const a = document.createElement("a");
    a.className = "nav-item" + (state.currentFolder===f.id?" active":"");
    a.dataset.id = f.id;
    a.innerHTML = `<span>${f.icon}</span><span>${f.name}</span><span class="count">${count||""}</span>`;
    a.addEventListener("click", ()=>{
      state.currentFolder = f.id;
      state.selectedIds.clear();
      state.currentId = null;
      render();
    });
    el.appendChild(a);
  }
}
function countFolder(folder){
  return filterByFolder(state.db.messages, folder).length;
}
function filterByFolder(list, folder){
  switch(folder){
    case "inbox":   return list.filter(m=>m.box==="inbox");
    case "starred": return list.filter(m=>m.starred && m.box!=="trash");
    case "sent":    return list.filter(m=>m.box==="sent");
    case "drafts":  return list.filter(m=>m.box==="drafts");
    case "archive": return list.filter(m=>m.box==="archive");
    case "spam":    return list.filter(m=>m.box==="spam");
    case "trash":   return list.filter(m=>m.box==="trash");
    default:        return list;
  }
}

// Search
function matchesQuery(m,q){
  if(!q) return true;
  const s = q.toLowerCase();
  const hay = [
    m.from, (m.to||[]).join(","), m.subject, m.body, (m.labels||[]).join(",")
  ].join("\n").toLowerCase();
  return hay.includes(s);
}

// Render list
function renderList(){
  const wrap = QS("#list");
  const items = filterByFolder(state.db.messages, state.currentFolder)
    .filter(m=>matchesQuery(m, state.query))
    .sort((a,b)=>b.date-a.date);
  wrap.innerHTML = "";
  if(items.length===0){
    wrap.innerHTML = `<div class="empty" style="height:100%;">${state.query? "検索結果がありません":"このフォルダは空です"}</div>`;
    return;
  }
  for(const m of items){
    const row = document.createElement("div");
    row.className = "msg" + (m.unread?" unread":"");
    row.dataset.id = m.id;
    const starClass = m.starred? "active":"";
    row.innerHTML = `
      <div class="avatar" title="${m.from}">${m.initials}</div>
      <div style="min-width:0">
        <div class="from">${m.from}</div>
        <div class="subject">${m.subject}</div>
        <div class="snippet">${(m.labels?.length? m.labels.map(l=>"#"+l).join(" ")+" · ":"")}${m.body.replace(/\n/g," ").slice(0,120)}</div>
      </div>
      <div class="meta">
        <div>${formatDate(m.date)}</div>
        <div class="star ${starClass}" data-star-id="${m.id}" title="スター">${m.starred?"★":"☆"}</div>
      </div>
    `;
    row.addEventListener("click", (e)=>{
      // If star clicked, don't open
      if(e.target && e.target.dataset.starId){ return; }
      openMessage(m.id);
    });
    row.querySelector(".star").addEventListener("click",(e)=>{
      e.stopPropagation();
      toggleStar(m.id);
    });
    wrap.appendChild(row);
  }
}

// Reader
function openMessage(id){
  const m = state.db.messages.find(x=>x.id===id);
  if(!m) return;
  state.currentId = id;
  m.unread = false;
  persist();
  QS("#emptyState").style.display = "none";
  QS("#readerWrap").style.display = "flex";
  QS("#readerSubject").textContent = m.subject || "(件名なし)";
  QS("#readerMeta").textContent    = `From: ${m.from}  /  To: ${(m.to||[]).join(", ")||"(なし)"} ・ ${formatDate(m.date)}`; 
  QS("#readerBody").innerHTML      = safeHtml(m.body).replace(/\n/g,"<br>");
  QS("#readerAvatar").textContent  = m.initials || "U";
  QS("#starIcon").textContent      = m.starred ? "★" : "☆";
  // Mobile: show reader
  QS("#layout").classList.add("show-reader");
  render();
}

function safeHtml(s=""){
  return s.replace(/[&<>"']/g, ch => ({
    "&":"&amp;","<":"&lt;",">":"&gt;",'"':"&quot;","'":"&#39;"
  }[ch]));
}

// Actions
function getSelectedOrCurrentIds(){
  if(state.selectedIds.size>0) return [...state.selectedIds];
  if(state.currentId) return [state.currentId];
  return [];
}
function markRead(read=true){
  for(const id of getSelectedOrCurrentIds()){
    const m = state.db.messages.find(x=>x.id===id);
    if(m) m.unread = !read;
  }
  persist(); render();
}
function moveTo(box){
  for(const id of getSelectedOrCurrentIds()){
    const m = state.db.messages.find(x=>x.id===id);
    if(m) m.box = box;
  }
  // If current message was moved out of view, clear reader
  if(state.currentId){
    const cm = state.db.messages.find(x=>x.id===state.currentId);
    const visible = filterByFolder([cm], state.currentFolder).length>0;
    if(!visible){ state.currentId = null; QS("#readerWrap").style.display="none"; QS("#emptyState").style.display="grid"; }
  }
  persist(); render();
}
function toggleStar(id){
  const m = state.db.messages.find(x=>x.id===id);
  if(m){ m.starred = !m.starred; persist(); render(); if(state.currentId===id) QS("#starIcon").textContent=m.starred?"★":"☆"; }
}

// Compose
function openCompose(prefill={}){
  QS("#composeModal").classList.add("open");
  QS("#to").value      = prefill.to?.join(", ") || "";
  QS("#subject").value = prefill.subject || "";
  QS("#body").value    = prefill.body || "";
  QS("#label").value   = (prefill.labels||[]).join(", ");
}
function closeCompose(){ QS("#composeModal").classList.remove("open"); }

function saveDraft(){
  const draft = collectForm();
  draft.box = "drafts";
  draft.unread = false;
  draft.from = "me@local";
  draft.id = crypto.randomUUID();
  state.db.messages.push(draft);
  persist(); closeCompose(); render();
  alert("下書きを保存しました。");
}
function sendMail(){
  const msg = collectForm();
  if(!msg.to.length){ alert("宛先を入力してください"); return; }
  msg.box = "sent";
  msg.unread = false;
  msg.from = "me@local";
  msg.id = crypto.randomUUID();
  state.db.messages.push(msg);
  persist(); closeCompose(); render();
  alert("送信しました（デモ動作：実送信なし）");
}
function collectForm(){
  const to = QS("#to").value.split(",").map(s=>s.trim()).filter(Boolean);
  const subject = QS("#subject").value.trim() || "(件名なし)";
  const body = QS("#body").value;
  const labels = QS("#label").value.split(",").map(s=>s.trim()).filter(Boolean);
  return { to, subject, body, labels, date: Date.now(), starred:false, unread:true, initials:"M" };
}

// Selection (click+Ctrl/Shift optional simplified)
QS("#list").addEventListener("click",(e)=>{
  const row = e.target.closest(".msg");
  if(!row) return;
  if(e.ctrlKey || e.metaKey){
    const id = row.dataset.id;
    if(state.selectedIds.has(id)) state.selectedIds.delete(id); else state.selectedIds.add(id);
    row.classList.toggle("selected");
  }
});

// Topbar controls
QS("#composeBtn").onclick = ()=>openCompose();
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ミニ百科.html

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  <!-- Structured data placeholder (updated on article view) -->
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  <script>
  // ======================
  //  サンプル記事データ
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    {
      id: 1,
      slug: 'fuji-san',
      title: '富士山',
      category: '地理',
      tags: ['日本','山','世界文化遺産'],
      summary: '日本の象徴ともいわれる成層火山。標高3,776mで日本最高峰。',
      updated: '2025-08-15',
      author: 'ミニ百科編集部',
      content: `
        <p>富士山は本州中部に位置する<span>成層火山</span>で、標高は3,776m。2013年に世界文化遺産に登録されました。古来より信仰の対象であり、芸術や文学にも多く登場します。</p>
        <h2 id="geo">地形と地質</h2>
        <p>富士山は何度もの噴火活動を経て現在の美しい円錐形を形成しました。火口は山頂部にあり、外輪としてお鉢巡りが知られています。</p>
        <h2 id="climb">登山と保全</h2>
        <p>一般的な登山シーズンは夏。登山道の混雑やゴミ問題、低温・高山病などのリスク対策が重要です。</p>
        <h2 id="culture">文化的意義</h2>
        <p>葛飾北斎の『富嶽三十六景』をはじめ、絵画や和歌に頻繁に詠まれ、日本の象徴として国際的にも広く知られています。</p>
      `
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    {
      id: 2,
      slug: 'internet-basics',
      title: 'インターネットの基礎',
      category: 'テクノロジー',
      tags: ['ネットワーク','Web','通信'],
      summary: '世界中のコンピュータを相互接続する情報ネットワークの総称。',
      updated: '2025-07-01',
      author: 'ミニ百科編集部',
      content: `
        <p>インターネットは標準化された<span>TCP/IP</span>により機器同士が通信する巨大なネットワークです。Web、メール、動画配信など多様なサービスの土台になっています。</p>
        <h2 id="protocols">主要プロトコル</h2>
        <p>HTTP/HTTPS、DNS、SMTP、FTPなどが代表的。セキュリティ確保には暗号化や認証が重要です。</p>
        <h2 id="web">Webの仕組み</h2>
        <p>ブラウザがURLを解決し、サーバからHTML/CSS/JS等のリソースを取得・表示します。</p>
        <h2 id="safety">安全な利用</h2>
        <p>二要素認証、ソフトウェア更新、フィッシング対策、強力なパスワード管理が基本です。</p>
      `
    },
    {
      id: 3,
      slug: 'dinosaurs',
      title: '恐竜',
      category: '生物',
      tags: ['古生物学','白亜紀','化石'],
      summary: '中生代に栄えた爬虫類のグループ。鳥類は恐竜の系統に含まれると考えられている。',
      updated: '2025-05-28',
      author: 'ミニ百科編集部',
      content: `
        <p>恐竜は約2億3000万年前に出現し、中生代に多様化しました。<span>鳥類</span>は恐竜の一系統とみなされます。</p>
        <h2 id="era">時代区分</h2>
        <p>三畳紀・ジュラ紀・白亜紀に区分され、各時代で特徴的な種が繁栄しました。</p>
        <h2 id="extinction">大量絶滅</h2>
        <p>約6600万年前の大量絶滅で多くが消滅。隕石衝突や火山活動などが要因と考えられています。</p>
      `
    },
    {
      id: 4,
      slug: 'ww2-overview',
      title: '第二次世界大戦（概説）',
      category: '歴史',
      tags: ['20世紀','戦争','国際関係'],
      summary: '1939年から1945年にかけて行われた世界規模の戦争。',
      updated: '2025-03-10',
      author: 'ミニ百科編集部',
      content: `
        <p>第二次世界大戦は多数の国が参戦した世界規模の戦争で、政治・経済・科学技術・社会に長期の影響を与えました。</p>
        <h2 id="fronts">主要戦線</h2>
        <p>ヨーロッパ、太平洋、北アフリカ、東部戦線など多くの戦域に分かれました。</p>
        <h2 id="aftermath">戦後の世界</h2>
        <p>国際連合の設立、冷戦構造の形成、国際秩序の再編などにつながりました。</p>
      `
    },
    {
      id: 5,
      slug: 'ai-basics',
      title: '人工知能の基礎',
      category: 'テクノロジー',
      tags: ['AI','機械学習','深層学習'],
      summary: '知的な処理をコンピュータで実現する研究分野と技術群。',
      updated: '2025-06-12',
      author: 'ミニ百科編集部',
      content: `
        <p>人工知能は探索・推論から機械学習・深層学習まで多様な手法を含みます。現代では大量データと計算資源により実世界応用が拡大。</p>
        <h2 id="ml">機械学習</h2>
        <p>教師あり・教師なし・強化学習などの枠組みがあり、予測や分類に用いられます。</p>
        <h2 id="dl">深層学習</h2>
        <p>多層ニューラルネットワークにより画像・音声・自然言語処理で高精度を実現。</p>
      `
    },
    {
      id: 6,
      slug: 'sakura',
      title: 'サクラ（桜）',
      category: '文化',
      tags: ['日本文化','植物','季節'],
      summary: '日本の春を象徴する花。花見は古くからの季節行事。',
      updated: '2025-04-02',
      author: 'ミニ百科編集部',
      content: `
        <p>桜はバラ科サクラ属の総称。品種が多く、花期は短いものの観賞価値が高いことで知られます。</p>
        <h2 id="hanami">花見の歴史</h2>
        <p>貴族文化から庶民に広がり、現在では地域の祭りや観光資源にもなっています。</p>
      `
    },
    {
      id: 7,
      slug: 'japan-history-outline',
      title: '日本史（概説）',
      category: '歴史',
      tags: ['古代','中世','近代'],
      summary: '古代から現代までの日本の歴史を大まかに概観する。',
      updated: '2025-01-20',
      author: 'ミニ百科編集部',
      content: `
        <p>日本史は縄文・弥生・古墳などの古代から、中世・近世、明治以降の近代・現代に至るまで連続する多様な変化の歴史です。</p>
        <h2 id="ancient">古代</h2>
        <p>稲作の普及、古代国家の形成、律令制の確立など。</p>
        <h2 id="modern">近代・現代</h2>
        <p>近代化、戦後復興、高度経済成長、少子高齢化と新たな課題。</p>
      `
    },
    {
      id: 8,
      slug: 'programming-intro',
      title: 'プログラミング入門',
      category: 'テクノロジー',
      tags: ['コード','アルゴリズム','学習'],
      summary: 'コンピュータに手順を伝えるための技術と考え方の総称。',
      updated: '2025-07-22',
      author: 'ミニ百科編集部',
      content: `
        <p>プログラミングは問題を分解し、再利用可能な手順として表現する作業です。変数、条件分岐、反復、関数などの基本を学ぶと応用が広がります。</p>
        <h2 id="lang">主な言語</h2>
        <p>Python、JavaScript、C#、C++ など用途に応じて選択されます。</p>
      `
    },
    {
      id: 9,
      slug: 'tea-ceremony',
      title: '茶道',
      category: '文化',
      tags: ['日本文化','礼法','芸道'],
      summary: '湯を沸かし茶を点て、客をもてなす総合芸術。',
      updated: '2025-05-03',
      author: 'ミニ百科編集部',
      content: `
        <p>茶道は道具、作法、空間、季節感などが一体となる総合芸術です。<span>和敬清寂</span>の精神が重視されます。</p>
        <h2 id="tools">道具</h2>
        <p>茶碗、茶筅、茶杓、釜、柄杓など。取り扱いには所作と配慮が求められます。</p>
      `
    },
    {
      id: 10,
      slug: 'solar-system',
      title: '太陽系',
      category: '天文学',
      tags: ['惑星','衛星','宇宙'],
      summary: '太陽とその周囲を公転する天体の集まり。',
      updated: '2025-06-30',
      author: 'ミニ百科編集部',
      content: `
        <p>太陽系は太陽を中心に、8つの惑星、準惑星、小惑星、彗星、塵やガスが重力で結びつくシステムです。</p>
        <h2 id="planets">惑星</h2>
        <p>水星・金星・地球・火星・木星・土星・天王星・海王星。各惑星は固有の特徴を持ちます。</p>
      `
    }
  ];

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  const $$ = (sel, root=document) => Array.from(root.querySelectorAll(sel));
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    category: '',
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    perPage: 9
  };

  function normalize(str){ return (str||'').toString().toLowerCase(); }

  function filterArticles(){
    let list = ARTICLES.slice();
    if(state.q){
      const q = normalize(state.q);
      list = list.filter(a => normalize(a.title+" "+a.summary+" "+a.tags.join(' ')+" "+a.content.replace(/<[^>]+>/g,'')).includes(q));
    }
    if(state.category){ list = list.filter(a => a.category===state.category); }
    if(state.tag){ list = list.filter(a => a.tags.includes(state.tag)); }
    if(state.sort==='recent'){ list.sort((a,b)=> new Date(b.updated)-new Date(a.updated)); }
    if(state.sort==='title'){ list.sort((a,b)=> a.title.localeCompare(b.title,'ja')); }
    return list;
  }

  // =============
  //  一覧描画
  // =============
  function renderCategories(){
    const select = $('#category');
    const cats = unique(ARTICLES.map(a=>a.category)).sort((a,b)=>a.localeCompare(b,'ja'));
    select.innerHTML = '<option value="">すべて</option>' + cats.map(c=>`<option value="${c}">${c}</option>`).join('');
  }

  function renderTagsBar(){
    const bar = $('#tagBar');
    const tags = unique(ARTICLES.flatMap(a=>a.tags)).sort((a,b)=>a.localeCompare(b,'ja'));
    bar.innerHTML = '<div class="flex flex-wrap gap-2">' + tags.map(t=>
      `<button data-tag="${t}" class="tag-btn px-3 py-1 rounded-full border border-slate-300 dark:border-slate-700 text-sm hover:bg-slate-100 dark:hover:bg-slate-800 ${state.tag===t?'bg-indigo-600 text-white border-indigo-600':''}">#${t}</button>`
    ).join('') + '</div>';
    $$('.tag-btn').forEach(b=> b.addEventListener('click',()=>{ state.tag = (state.tag===b.dataset.tag? '' : b.dataset.tag); state.page=1; syncList(); }));
  }

  function createCard(a){
    const bookmarked = isBookmarked(a.slug);
    return `
      <article class="border border-slate-200 dark:border-slate-700 rounded-2xl p-4 bg-white/70 dark:bg-slate-800/70 hover:shadow transition">
        <header class="flex items-start justify-between gap-3">
          <h3 class="text-lg font-semibold leading-tight">${a.title}</h3>
          <button class="bookmark inline-flex items-center justify-center w-9 h-9 rounded-full ${bookmarked?'text-amber-500':'text-slate-400'}" title="ブックマーク" data-slug="${a.slug}">
            <i class="${bookmarked?'fa-solid':'fa-regular'} fa-star"></i>
          </button>
        </header>
        <div class="mt-1 text-sm text-slate-500">${a.category}・更新 ${fmtDate(a.updated)}</div>
        <p class="mt-2 text-sm line-clamp-3">${a.summary}</p>
        <div class="mt-3 flex flex-wrap gap-2 text-xs">${a.tags.map(t=>`<span class='px-2 py-1 rounded-full bg-slate-100 dark:bg-slate-700'>#${t}</span>`).join('')}</div>
        <div class="mt-4 flex gap-2">
          <a href="#/a/${a.slug}" class="inline-flex items-center gap-2 px-3 py-2 rounded-xl bg-indigo-600 text-white text-sm hover:opacity-90"><i class="fa-solid fa-circle-info"></i> 詳細</a>
          <button class="copy-link inline-flex items-center gap-2 px-3 py-2 rounded-xl border border-slate-300 dark:border-slate-700 text-sm hover:bg-slate-100 dark:hover:bg-slate-800" data-link="${location.origin+location.pathname}#/a/${a.slug}"><i class="fa-solid fa-link"></i>リンク</button>
        </div>
      </article>
    `;
  }

  function renderPager(total){
    const pager = $('#pager');
    const pages = Math.max(1, Math.ceil(total/state.perPage));
    state.page = Math.min(state.page, pages);
    let html='';
    for(let i=1;i<=pages;i++){
      html += `<button class="px-3 py-1 rounded-lg border ${i===state.page?'bg-indigo-600 text-white border-indigo-600':'border-slate-300 dark:border-slate-700 hover:bg-slate-100 dark:hover:bg-slate-800'}" data-page="${i}">${i}</button>`;
    }
    pager.innerHTML = html;
    $$('#pager button').forEach(b=> b.addEventListener('click',()=>{ state.page=Number(b.dataset.page); syncList(false); }));
  }

  function syncList(scrollTop=true){
    const list = filterArticles();
    $('#resultCount').textContent = list.length;
    renderPager(list.length);

    const start=(state.page-1)*state.perPage;
    const pageItems=list.slice(start, start+state.perPage);
    $('#cards').innerHTML = pageItems.map(createCard).join('');

    // events
    $$('.bookmark').forEach(b=> b.addEventListener('click',()=>{ toggleBookmark(b.dataset.slug); syncList(false); }));
    $$('.copy-link').forEach(b=> b.addEventListener('click',()=> copyText(b.dataset.link)));

    if(scrollTop) window.scrollTo({top:0, behavior:'smooth'});
  }

  // =================
  // 記事ページ描画
  // =================
  function renderArticle(slug){
    const a = slugToArticle(slug);
    if(!a){ location.hash = ''; return; }

    // breadcrumb
    $('#breadcrumb').innerHTML = `<a class="underline" href="#">ホーム</a> / <span class="text-slate-600">${a.category}</span>`;

    // title & meta
    $('#articleTitle').textContent = a.title;
    $('#articleMeta').innerHTML = `
      <span><i class="fa-regular fa-calendar"></i> 更新 ${fmtDate(a.updated)}</span>
      <span class="mx-1">•</span>
      <span><i class="fa-regular fa-user"></i> ${a.author}</span>
      <span class="mx-1">•</span>
      <span><i class="fa-solid fa-folder"></i> ${a.category}</span>
    `;

    // content
    const container = $('#articleContent');
    container.innerHTML = a.content;

    // tags
    $('#articleTags').innerHTML = a.tags.map(t=>`<a href="#" data-tag="${t}" class="px-3 py-1 rounded-full border border-slate-300 dark:border-slate-700 text-sm hover:bg-slate-100 dark:hover:bg-slate-800">#${t}</a>`).join('');
    $$('#articleTags a').forEach(el=> el.addEventListener('click',(e)=>{ e.preventDefault(); state.tag=el.dataset.tag; location.hash=''; }));

    // bookmark button
    const btnBM = $('#btnToggleBookmark');
    const setBM = ()=>{
      const marked = isBookmarked(a.slug);
      btnBM.innerHTML = `<i class="${marked?'fa-solid':'fa-regular'} fa-star me-1"></i>${marked?'保存済み':'ブックマーク'}`;
    };
    btnBM.onclick = ()=>{ toggleBookmark(a.slug); setBM(); };
    setBM();

    // copy link
    $('#btnCopyLink').onclick = ()=> copyText(location.href);

    // TOC
    buildTOC();

    // JSON-LD
    updateLDJSON(a);

    // history
    pushHistory(a.slug);
  }

  function buildTOC(){
    const toc = $('#toc');
    const headings = $$('#articleContent h2, #articleContent h3');
    if(headings.length===0){ toc.innerHTML = '<div class="text-slate-500 text-sm">見出しがありません</div>'; return; }
    let html='';
    headings.forEach(h=>{
      if(!h.id) h.id = h.textContent.trim().toLowerCase().replace(/[^a-z0-9一-龥ぁ-んァ-ヶー]+/g,'-');
      const indent = h.tagName==='H3' ? 'ms-4' : '';
      html += `<a href="#${h.id}" class="${indent} hover:text-indigo-600">${h.textContent}</a>`;
    });
    toc.innerHTML = html;

    const observer = new IntersectionObserver((entries)=>{
      entries.forEach(e=>{
        if(e.isIntersecting){
          $$('#toc a').forEach(a=>a.classList.remove('active'));
          const a = $(`#toc a[href="#${e.target.id}"]`);
          if(a) a.classList.add('active');
        }
      });
    }, {rootMargin: '0px 0px -70% 0px'});
    headings.forEach(h=> observer.observe(h));
  }

  function updateLDJSON(a){
    const obj = {
      '@context':'https://schema.org',
      '@type':'Article',
      headline: a.title,
      dateModified: a.updated,
      author: { '@type':'Organization', name: a.author },
      keywords: a.tags.join(','),
      articleSection: a.category,
      url: location.href
    };
    $('#ldjson').textContent = JSON.stringify(obj);
  }

  // ============
  //  ルーター
  // ============
  function route(){
    const hash = location.hash.slice(1);
    if(hash.startsWith('/a/')){
      const slug = hash.split('/')[2];
      $('#view-home').classList.add('hidden');
      $('#view-article').classList.remove('hidden');
      renderArticle(slug);
      window.scrollTo({top:0, behavior:'instant'});
    }else{
      $('#view-article').classList.add('hidden');
      $('#view-home').classList.remove('hidden');
      syncList();
    }
  }

  window.addEventListener('hashchange', route);

  // ============
  //  便利機能
  // ============
  function copyText(text){
    navigator.clipboard.writeText(text).then(()=>{
      toast('リンクをコピーしました');
    }, ()=>{
      prompt('コピーできない場合は手動で選択してコピーしてください:', text);
    });
  }

  function toast(msg){
    const t = document.createElement('div');
    t.textContent = msg;
    t.className = 'fixed left-1/2 -translate-x-1/2 bottom-6 z-50 bg-black/80 text-white px-4 py-2 rounded-xl text-sm';
    document.body.appendChild(t);
    setTimeout(()=>{ t.remove(); }, 1600);
  }

  function randomArticle(){
    const a = ARTICLES[Math.floor(Math.random()*ARTICLES.length)];
    location.hash = `#/a/${a.slug}`;
  }

  // ==============
  //  I/O (JSON)
  // ==============
  function exportJSON(){
    const blob = new Blob([JSON.stringify(ARTICLES, null, 2)], {type:'application/json'});
    const url = URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url; a.download = 'mini-encyclopedia.json'; a.click();
    URL.revokeObjectURL(url);
  }

  function importJSON(file){
    const reader = new FileReader();
    reader.onload = (e)=>{
      try{
        const data = JSON.parse(e.target.result);
        if(Array.isArray(data)){
          // 形式が正しければ差し替え
          if(data.every(x=>x.slug && x.title && x.content)){
            ARTICLES.length = 0; // 破壊的更新
            data.forEach(x=> ARTICLES.push(x));
            init();
            toast('JSONを読み込みました');
          }else{
            alert('スキーマが不正です。slug/title/content は必須です。');
          }
        }else{
          alert('配列形式のJSONが必要です');
        }
      }catch(err){
        alert('JSONの解析に失敗しました: '+err.message);
      }
    };
    reader.readAsText(file);
  }

  // ============
  //  初期化
  // ============
  function init(){
    // 年
    $('#year').textContent = new Date().getFullYear();

    // カテゴリ・タグバー
    renderCategories();
    renderTagsBar();

    // イベント
    $('#search').addEventListener('input', (e)=>{ state.q = e.target.value.trim(); state.page=1; syncList(); });
    $('#category').addEventListener('change', (e)=>{ state.category = e.target.value; state.page=1; syncList(); });
    $('#sort').addEventListener('change', (e)=>{ state.sort = e.target.value; state.page=1; syncList(); });
    $('#btnRandom').addEventListener('click', randomArticle);
    $('#btnBookmarks').addEventListener('click', ()=>{
      const bms = getBookmarks();
      if(bms.length===0){ toast('ブックマークはまだありません'); return; }
      const first = slugToArticle(bms[0]);
      if(first) location.hash = `#/a/${first.slug}`;
    });
    $('#btnHome').addEventListener('click', ()=>{ location.hash=''; });

    // ダークモード切替
    $('#btnDark').addEventListener('click', ()=>{
      const root = document.documentElement;
      const isDark = root.classList.toggle('dark');
      localStorage.setItem('theme', isDark? 'dark':'light');
    });

    // JSON I/O
    $('#btnExport').addEventListener('click', exportJSON);
    $('#fileImport').addEventListener('change', (e)=>{ const f=e.target.files?.[0]; if(f) importJSON(f); e.target.value=''; });

    // 初回描画
    route();
  }

  document.addEventListener('DOMContentLoaded', init);
  </script>
</body>
</html>