body { background-color: #dbe9f4; /* 青い宇宙のイメージ */ color: #1a1a1a; font-family: "Hiragino Kaku Gothic ProN", "游ゴシック体", YuGothic, sans-serif; line-height: 1.9; padding: 2em; } h1 { font-size: 1.8em; text-align: center; margin-bottom: 0.5em; } h2 { font-size: 1.3em; text-align: center; margin-top: 0; m…