/* =========================================
   Zero-Cost SEO 共通スタイルシート
   ========================================= */

/* --- 基本設定 --- */
body {
    font-family: 'Noto Sans JP', sans-serif;
    background-color: #f4f7f9;
    color: #333;
    line-height: 1.6;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 0 20px;
}

/* --- 共通ヘッダー (index.htmlのデザインを継承) --- */
.main-header {
    text-align: center;
    padding: 40px 0;
    background: #2c3e50;
    color: white;
    border-radius: 0 0 20px 20px;
    margin-bottom: 30px;
}

.main-header h1 {
    font-size: 1.8rem;
    margin: 0 0 10px 0;
}

.main-header p {
    font-size: 0.9rem;
    opacity: 0.9;
    margin: 0;
}

/* --- 共通フッター --- */
.footer, .main-footer {
    text-align: center;
    padding: 40px 0;
    color: #999;
    font-size: 0.8rem;
}

/* --- チャプターカード (トップページ用) --- */
.chapter-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 25px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    border-top: 5px solid #f39c12;
    text-decoration: none;
    display: block;
    color: inherit;
    transition: transform 0.2s;
}

.chapter-card:active {
    transform: scale(0.98);
}

.chapter-card h2 {
    font-size: 1.2rem;
    color: #2c3e50;
    margin: 0 0 10px 0;
    display: flex;
    align-items: center;
}

.chapter-card h2::before {
    content: "▶";
    font-size: 0.8rem;
    margin-right: 8px;
    color: #f39c12;
}

.chapter-card p {
    font-size: 0.85rem;
    color: #666;
    margin: 0;
}

/* 特別ガイド用カード (移行ガイド) */
.special-card {
    border-top: 5px solid #3498db;
    background: #f0f7ff;
    border: 1px solid #3498db;
}

.special-card h2 {
    color: #2980b9;
}

.special-card h2::before {
    color: #3498db;
}

.badge {
    background: #3498db;
    color: white;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.7rem;
    margin-bottom: 8px;
    display: inline-block;
}

/* --- 記事ページ用スタイル --- */
.back-link {
    display: inline-block;
    margin-bottom: 20px;
    color: #f39c12;
    text-decoration: none;
    font-weight: bold;
    font-size: 0.9rem;
}

.post-content {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    margin-bottom: 40px;
}

.post-content h1 {
    font-size: 1.6rem;
    color: #2c3e50;
    margin-top: 0;
    line-height: 1.4;
}

.post-content h2 {
    font-size: 1.3rem;
    color: #2c3e50;
    border-left: 4px solid #f39c12;
    padding-left: 12px;
    margin-top: 40px;
}

.post-nav {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    margin: 40px 0;
}

.post-nav a {
    background: white;
    padding: 15px;
    border-radius: 10px;
    text-decoration: none;
    color: #f39c12;
    font-weight: bold;
    font-size: 0.85rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    flex: 1;
}

/* --- 記事末尾のリスト (写真のデザインを完全再現) --- */
.article-footer-nav h3 {
    font-size: 1.1rem;
    color: #2c3e50;
    margin-bottom: 20px;
}

.vertical-article-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.vertical-article-list li {
    margin-bottom: 15px;
}

.vertical-article-list a {
    display: flex;
    align-items: center;
    text-decoration: none;
    background-color: #ffffff;
    padding: 15px 20px;
    border-radius: 12px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.08);
    transition: background 0.2s;
}

.vertical-article-list a:active {
    background-color: #f0f0f0;
}

.card-number {
    color: #f39c12;
    font-size: 1.5rem;
    font-weight: bold;
    width: 40px;
    margin-right: 15px;
    text-align: center;
}

.card-title {
    color: #333;
    font-size: 0.95rem;
    flex-grow: 1;
    line-height: 1.4;
}

.card-arrow {
    color: #ccc;
    font-size: 1.2rem;
    margin-left: 10px;
}