body { background-color: #f0f0f3; /* 薄いグレー宇宙風 */ font-family: "Hiragino Kaku Gothic ProN", Meiryo, sans-serif; color: #222; line-height: 1.9; padding: 3em 1em; } .container { max-width: 760px; background: #fff; padding: 2.5em; margin: auto; box-shadow: 0 0 18px rgba(0, 0, 0, 0.08); border-radius: 12…