body{margin:0;font:16px/1.6 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:#1d1d1f;background:#fafafa}
main{max-width:46rem;margin:0 auto;padding:1.5rem}
h1{font-size:1.8rem;margin:1rem 0}h2{font-size:1.15rem;margin-top:1.8rem}
a{color:#0b5fff}nav,footer{font-size:.9rem;color:#555}footer{margin-top:3rem;border-top:1px solid #ddd;padding-top:1rem}
.box{border:1px solid #ccc;background:#fff;padding:1rem;border-radius:6px}
@media(prefers-color-scheme:dark){body{background:#111;color:#e6e6e6}a{color:#7aa7ff}.box{background:#1a1a1a;border-color:#333}}