* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    line-height: 1.8;
    color: #333;
    background-color: white;
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

header {
    padding: 90px 30px 20px;
    text-align: center;
}

header h1 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 10px;
}

.update-date {
    font-size: 14px;
    opacity: 0.9;
}

.content {
    padding: 40px 30px;
}

.chapter {
    margin-bottom: 50px;
}

.chapter-title {
    font-size: 24px;
    padding-bottom: 10px;
    border-bottom: 3px solid #333;
    margin-bottom: 30px;
    margin-top: 40px;
}

.article {
    margin-bottom: 35px;
    padding: 20px;
    border-radius: 4px;
}

.article-title {
    font-size: 18px;
    font-weight: 600;
    color: #333;
    margin-bottom: 15px;
}

.article-content {
    margin-left: 20px;
}

.article-content p {
    margin-bottom: 12px;
}

.article-content ol, .article-content ul {
    margin-left: 20px;
    margin-bottom: 12px;
}

.article-content li {
    margin-bottom: 8px;
}

.subsection {
    margin-left: 20px;
    margin-top: 10px;
}

footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 20px;
    font-size: 14px;
}

.list-style-type-decimal {list-style-type: decimal;}

@media (max-width: 768px) {
    header h1 {
        font-size: 22px;
    }
    
    .content {
        padding: 30px 20px;
    }
    
    .chapter-title {
        font-size: 20px;
    }
    
    .article-title {
        font-size: 16px;
    }
}