body{font-family:system-ui,-apple-system,"Segoe UI",sans-serif;margin:0;line-height:1.6;color:#172033;background:#f6f8fb}header{background:#172033;color:#fff}nav,main,footer{max-width:850px;margin:auto;padding:1rem 1.25rem}nav{display:flex;gap:1.25rem;flex-wrap:wrap}nav strong{margin-right:auto}nav a{color:#fff;text-decoration:none}main{background:#fff;margin-top:2rem;margin-bottom:2rem;padding:2rem;border-radius:12px}a{color:#185abc}.notice{background:#eef4ff;border-left:4px solid #185abc;padding:1rem}footer{color:#596273}