body { font-family: "Yu Gothic", "游ゴシック体", "ヒラギノ角ゴ Pro", Meiryo, sans-serif; line-height: 1.6; max-width: 800px; margin: 2rem auto; padding: 0 1rem; color: #333; background−color: #fefefe; } h1 { color: #2c3e50; border-bottom: 3px solid #3498db; padding-bottom: 0.3em; } h2 { color: #2980b9; margin-t…