body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f5f5f5;
}

.container {
    background-color: white;
    border-radius: 8px;
    padding: 40px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.back-link {
    display: inline-block;
    color: #3498db;
    text-decoration: none;
    margin-bottom: 20px;
    font-size: 14px;
}

.back-link:hover {
    text-decoration: underline;
}

#content h1 {
    color: #2c3e50;
    border-bottom: 2px solid #3498db;
    padding-bottom: 10px;
    margin-top: 0;
}

#content h2 {
    color: #34495e;
    margin-top: 30px;
    margin-bottom: 15px;
}

#content h3 {
    color: #555;
    margin-top: 20px;
    margin-bottom: 10px;
}

#content p {
    margin-bottom: 15px;
}

#content ul, #content ol {
    margin-bottom: 15px;
    padding-left: 30px;
}

#content li {
    margin-bottom: 8px;
}

#content table {
    border-collapse: collapse;
    width: 100%;
    margin: 20px 0;
}

#content table th,
#content table td {
    border: 1px solid #ddd;
    padding: 12px;
    text-align: left;
}

#content table th {
    background-color: #f8f9fa;
    font-weight: 600;
    color: #2c3e50;
}

#content table tr:nth-child(even) {
    background-color: #f8f9fa;
}

#content blockquote {
    border-left: 4px solid #3498db;
    padding-left: 20px;
    margin-left: 0;
    color: #666;
    font-style: italic;
}

#content code {
    background-color: #f4f4f4;
    padding: 2px 6px;
    border-radius: 3px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9em;
}

#content strong {
    color: #2c3e50;
}

/* モバイル対応 */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    .container {
        padding: 20px;
    }
    
    #content h1 {
        font-size: 24px;
    }
    
    #content h2 {
        font-size: 20px;
    }
    
    #content table {
        font-size: 14px;
    }
}