body { font-family: 'Hiragino Sans', 'Meiryo', sans-serif; line-height: 1.8; max-width: 800px; margin: 0 auto; padding: 20px; color: #333; } h1 { color: #2c3e50; border-bottom: 3px solid #3498db; padding-bottom: 10px; } h2 { color: #34495e; margin-top: 30px; border-left: 5px solid #3498db; padding-l…