:root{--navy:#0c2d48;--blue:#0096c7;--pale:#f0f9ff;--line:#d9edf6;--muted:#4a6b7f}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,sans-serif;color:var(--navy);line-height:1.7;background:#fff}header{background:var(--pale);border-bottom:1px solid var(--line)}nav,main,footer{max-width:920px;margin:auto;padding:20px 24px}nav{display:flex;justify-content:space-between;align-items:center}nav a{color:var(--blue);font-weight:700;text-decoration:none}main{padding-top:56px;padding-bottom:72px}h1{font-size:clamp(2rem,6vw,3.5rem);line-height:1.1;margin:0 0 16px}h2{margin-top:40px;line-height:1.25}a{color:#007aa3}footer{border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}.updated{color:var(--muted)}