body{font:18px/1.65 system-ui,sans-serif;color:#172337;background:#fff;max-width:760px;margin:60px auto;padding:0 24px}header{border-bottom:3px solid #2458b8;padding-bottom:18px}h1{font-size:2.2rem;line-height:1.15}h2{font-size:1.3rem;margin-top:2em}a{color:#174b9f}nav{display:flex;gap:24px;margin:18px 0}small{color:#536175}footer{border-top:1px solid #c9d2df;margin-top:48px;padding:20px 0}a:focus-visible{outline:3px solid #174b9f;outline-offset:4px}@media(max-width:600px){body{margin-top:28px}}