body { font-family: 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', sans-serif; line-height: 1.7; color: #333; max-width: 800px; margin: 0 auto; padding: 20px; } h1 { font-size: 28px; color: #2c3e50; margin-bottom: 25px; padding-bottom: 10px; border-bottom: 2px solid #3498db; } h2 { fo…