:root{font-family:system-ui,"Yu Gothic",sans-serif;color:#182333;background:#f3f6fa;line-height:1.8}body{margin:0}main{max-width:780px;margin:48px auto;padding:40px;background:white;border:1px solid #dce4ee;border-radius:16px}h1{font-size:2rem;line-height:1.3}h2{font-size:1.15rem;margin-top:2rem}.label{color:#506983;font-size:.9rem}a{color:#205caf}nav{display:flex;gap:24px;border-top:1px solid #dce4ee;margin-top:32px;padding-top:24px}footer{font-size:.8rem;color:#637284;margin-top:24px}@media(max-width:600px){main{margin:0;padding:24px;border-radius:0;border:0}}