body { background-color: #e4f1f8; /* 知的な水色系(落ち着いた水色) */ color: #222; font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif; line-height: 1.8; padding: 2em; } h1 { font-size: 1.8em; border-bottom: 2px solid #66a3c7; padding-bottom: 0.3em; margin-bottom: 1em; color: #2d5c7f; } h2 {…