/* 基本スタイル */
:root {
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --text-color: #333;
    --light-gray: #f4f4f4;
    --border-color: #ddd;
    --font-sans: 'Helvetica Neue', Arial, sans-serif;
    --font-serif: 'Georgia', Times, serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--text-color);
    background-color: #fff;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s;
}

a:hover {
    color: var(--secondary-color);
}

img {
    max-width: 100%;
    height: auto;
}

/* ヘッダー */
header {
    background-color: var(--secondary-color);
    color: white;
    padding: 15px 0;
}

header h1 {
    font-size: 1.8rem;
}

header h1 a {
    color: white;
}

header nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header nav ul {
    display: flex;
    list-style: none;
}

header nav li {
    margin-left: 20px;
    position: relative;
}

header nav form {
    display: flex;
}

header nav input[type="text"] {
    padding: 8px;
    border: none;
    border-radius: 4px 0 0 4px;
    width: 200px;
}

header nav button {
    padding: 8px 12px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
}

/* 言語メニュー */
.language-menu {
    position: relative;
}

.language-menu > a {
    padding-right: 15px;
    position: relative;
}

.language-menu > a::after {
    content: '\25BC';
    font-size: 0.7em;
    margin-left: 5px;
}

.language-menu ul {
    display: none;
    position: absolute;
    background-color: white;
    min-width: 150px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    z-index: 1;
    flex-direction: column;
    right: 0;
}

.language-menu:hover ul {
    display: block;
}

.language-menu li {
    margin: 0;
    padding: 0;
}

.language-menu li a {
    color: var(--text-color);
    padding: 10px 15px;
    display: block;
    white-space: nowrap;
}

.language-menu li a:hover {
    background-color: var(--light-gray);
}

.language-menu li.active a {
    background-color: var(--primary-color);
    color: white;
}

/* メインレイアウト */
.container {
    display: flex;
    flex-wrap: wrap;
    margin-top: 20px;
}

main {
    flex: 1;
    min-width: 0;
    padding-right: 20px;
}

aside {
    width: 300px;
}

/* 記事カード */
.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.article-card {
    border: 1px solid var(--border-color);
    border-radius: 5px;
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.article-image {
    height: 180px;
    overflow: hidden;
}

.article-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s;
}

.article-card:hover .article-image img {
    transform: scale(1.05);
}

.article-content {
    padding: 15px;
}

.article-content h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    line-height: 1.4;
}

.article-summary {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 10px;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
}

.article-summary2 {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 10px;
    padding:30px 0;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
}

.article-meta {
    font-size: 0.8rem;
    color: #999;
}

/* セクションタイトル */
section h2 {
    font-size: 1.5rem;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 10px;
    margin-bottom: 20px;
}

/* サイドバー */
.sidebar-widget {
    margin-bottom: 30px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    padding: 15px;
}

.sidebar-widget h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.popular-articles {
    list-style: none;
}

.popular-articles li {
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.popular-articles li:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.popular-articles a {
    display: flex;
    align-items: center;
}

.popular-articles img {
    width: 60px;
    height: 60px;
    object-fit: cover;
    margin-right: 10px;
    border-radius: 3px;
}

.popular-articles span {
    font-size: 0.9rem;
}

/* フッター */
footer {
    background-color: var(--secondary-color);
    color: white;
    padding: 20px 0;
    margin-top: 40px;
}

/* 記事詳細ページ */
.article-detail {
    margin-bottom: 40px;
}

.article-header {
    margin-bottom: 20px;
}

.article-header h1 {
    font-size: 2rem;
    line-height: 1.3;
    margin-bottom: 10px;
}

.article-featured-image {
    margin-bottom: 20px;
    border-radius: 5px;
    overflow: hidden;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
}

.article-summary {
    font-size: 1.1rem;
    margin-bottom: 20px;
    padding: 15px;
    background-color: var(--light-gray);
    border-radius: 5px;
}

.article-content {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 30px;
}

.article-content p {
    margin-bottom: 20px;
}

.article-content h2 {
    font-size: 1.6rem;
    margin: 30px 0 15px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 5px;
}

.article-content h3 {
    font-size: 1.3rem;
    margin: 25px 0 15px;
}

.article-content ul, .article-content ol {
    margin-left: 25px;
    margin-bottom: 20px;
}

.article-ad-container {
    margin: 30px 0;
    padding: 20px;
    background-color: var(--light-gray);
    border-radius: 5px;
}

.article-footer {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.article-tags {
    margin-bottom: 20px;
}

.article-tags h4, .article-share h4 {
    font-size: 1rem;
    margin-bottom: 10px;
}

.article-tags ul {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
}

.article-tags li {
    margin-right: 10px;
    margin-bottom: 5px;
}

.article-tags a {
    display: block;
    padding: 5px 10px;
    background-color: var(--light-gray);
    border-radius: 3px;
    font-size: 0.8rem;
}

.social-share {
    display: flex;
    list-style: none;
}

.social-share li {
    margin-right: 15px;
}

.social-share a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: white;
}

/* アフィリエイト広告 */
.affiliate-ad {
    margin-bottom: 20px;
    padding: 15px;
    background-color: var(--light-gray);
    border-radius: 5px;
}

.affiliate-ad p {
    font-size: 0.8rem;
    margin-bottom: 10px;
    text-align: center;
    color: #999;
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }
    
    main {
        padding-right: 0;
    }
    
    aside {
        width: 100%;
        margin-top: 30px;
    }
    
    .article-grid {
        grid-template-columns: 1fr;
    }
    
    header nav {
        flex-direction: column;
        align-items: flex-start;
    }
    
    header nav ul {
        flex-direction: column;
        width: 100%;
        margin-top: 15px;
    }
    
    header nav li {
        margin: 5px 0;
    }
    
    header nav form {
        width: 100%;
        margin-top: 10px;
    }
    
    header nav input[type="text"] {
        width: 100%;
    }
    
    .language-menu ul {
        position: relative;
        width: 100%;
        box-shadow: none;
    }
    
    .article-header h1 {
        font-size: 1.6rem;
    }
    
    .article-content {
        font-size: 1rem;
    }
}

/* 関連記事セクション */
.related-articles {
    margin-top: 50px;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
}

.related-header {
    margin-bottom: 20px;
}

.related-header p {
    color: #666;
    font-size: 1rem;
}

.related-grid {
    margin-bottom: 20px;
}

.see-more-articles {
    text-align: center;
    margin: 30px 0;
}

.btn-more {
    display: inline-block;
    padding: 10px 25px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 5px;
    font-weight: bold;
    transition: background-color 0.3s;
}

.btn-more:hover {
    background-color: var(--secondary-color);
    color: white;
    text-decoration: none;
}

@media (max-width: 768px) {
    .related-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .related-grid {
        grid-template-columns: 1fr;
    }
}