body { background-color: #f2e6d9; /* 優しい薄茶色 */ font-family: "Hiragino Kaku Gothic ProN", Meiryo, sans-serif; color: #333; line-height: 1.9; padding: 3em 1.5em; } .container { max-width: 720px; margin: 0 auto; background: #fffefb; color: #333; padding: 2.5em; border-radius: 12px; box-shadow: 0 0 15px…