:root{--bg:#fff;--fg:#14181f;--muted:#5a6472;--accent:#1f5eff;--line:#e3e7ee}
@media (prefers-color-scheme:dark){:root{--bg:#0e1116;--fg:#e8ebf0;--muted:#9aa4b2;--accent:#6b9bff;--line:#262c36}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,sans-serif}
main,header,footer{max-width:46rem;margin:0 auto;padding:1rem}
header{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line)}
header a{color:var(--fg);text-decoration:none;font-weight:600}
a{color:var(--accent)}
h1{font-size:2.2rem;line-height:1.2}
.lead{font-size:1.2rem;color:var(--muted)}
.cta{display:inline-block;background:var(--accent);color:#fff;padding:.7rem 1.2rem;border-radius:.4rem;text-decoration:none}
ul{padding-left:1.2rem}
footer{color:var(--muted);border-top:1px solid var(--line);font-size:.9rem}