:root{--bg:#f7faf9;--fg:#1c2a2a;--muted:#4d6060;--accent:#0f6b6b;--card:#ffffff;--border:#d3e0de}
@media (prefers-color-scheme:dark){:root{--bg:#0f1a1a;--fg:#e4eeed;--muted:#a3b8b6;--accent:#5cc4c0;--card:#162424;--border:#2a3f3e}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:1rem/1.65 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;overflow-wrap:break-word}
header,main,footer{max-width:720px;margin:0 auto;padding-left:16px;padding-right:16px}
header{padding-top:24px;padding-bottom:16px;display:flex;flex-wrap:wrap;gap:8px 24px;align-items:baseline;border-bottom:1px solid var(--border)}
header .brand{font-size:1.25rem;font-weight:700;letter-spacing:.04em;text-decoration:none}
header nav a{margin-right:16px}
main{padding-top:32px;padding-bottom:48px}
footer{padding-top:24px;padding-bottom:40px;border-top:1px solid var(--border);color:var(--muted);font-size:.9rem}
a{color:var(--accent)}
a:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
h1{font-size:2rem;line-height:1.25;margin:0 0 .5em}
h2{font-size:1.35rem;line-height:1.3;margin:2em 0 .5em}
p,ul{margin:0 0 1em}
li{margin-bottom:.4em}
.lead{font-size:1.2rem;color:var(--muted)}
.cards{display:grid;gap:16px;margin-top:24px}
.card{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:20px}
.card h2{margin-top:0}
.card p:last-child{margin-bottom:0}
.note{background:var(--card);border:1px solid var(--border);border-left:4px solid var(--accent);border-radius:6px;padding:16px 20px;margin:0 0 1.5em}
.note h2{margin-top:0}