:root{--bg:#f7f8fa;--fg:#1b2430;--muted:#556070;--line:#d6dbe2;--accent:#0d5c78}
@media (prefers-color-scheme:dark){:root{--bg:#12171d;--fg:#e4e9ef;--muted:#9eabb9;--line:#2c3743;--accent:#7cc8e2}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:400 18px/1.6 Georgia,"Times New Roman",serif}
main,footer{max-width:40rem;margin:0 auto;padding:2rem 1rem}
h1{font-size:2rem;line-height:1.2;margin:0 0 1rem}
h2{font-size:1.25rem;margin:0}
ol{list-style:none;padding:0;margin:1.5rem 0;display:grid;gap:1.25rem}
li{border-top:1px solid var(--line);padding-top:1.25rem}
.by,.note,footer{color:var(--muted);font-size:.95rem}
a{color:var(--accent)}
a:focus-visible{outline:3px solid var(--accent);outline-offset:2px}