:root{--ink:#1c2430;--muted:#5b6675;--line:#e3e7ec;--accent:#0f766e;--bg:#fbfbfa}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 Georgia,"Times New Roman",serif}
header{display:flex;justify-content:space-between;align-items:baseline;padding:1.2rem 1.4rem;border-bottom:1px solid var(--line)}
.brand{font-weight:700;text-decoration:none;color:var(--ink);letter-spacing:.02em}
nav a{margin-left:1.1rem;color:var(--muted);text-decoration:none}
nav a:hover{color:var(--accent)}
main{max-width:42rem;margin:0 auto;padding:2.4rem 1.4rem 3rem}
h1{font-size:1.7rem;line-height:1.25;margin:0 0 1rem}
h2{font-size:1.2rem;margin:1.8rem 0 .5rem}
p{margin:.6rem 0}
ul{padding-left:1.2rem}
a{color:var(--accent)}
footer{border-top:1px solid var(--line);color:var(--muted);padding:1rem 1.4rem;font-size:.85rem}
@media (prefers-color-scheme:dark){:root{--ink:#d6dae0;--muted:#98a1ad;--line:#2a313a;--bg:#171b21;--accent:#4fd1c5}}