:root{--bg:#D9ECF5;--top:#A6CFE5;--ink:#14223A;--muted:#4b5a6e;--accent:#0E6A70;--card:rgba(255,255,255,.75)}
*{box-sizing:border-box}body{margin:0;font:17px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;color:var(--ink);background:linear-gradient(var(--top),var(--bg)) fixed}
main{max-width:760px;margin:0 auto;padding:28px 16px 60px}h1{font:700 32px/1.2 Georgia,serif;margin:.2em 0}h2{font:700 22px/1.3 Georgia,serif;margin:1.6em 0 .4em}
.card{background:var(--card);border:1.5px solid #4d7899;border-radius:18px;padding:18px 20px;margin:14px 0;box-shadow:0 6px 18px rgba(26,64,97,.18)}
nav a,a{color:var(--accent);font-weight:600}nav{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:10px}.muted{color:var(--muted);font-size:15px}
h3{font:700 19px/1.3 Georgia,serif;margin:.4em 0 .3em}ol{padding-left:22px}li{margin:.35em 0}