:root{--bg:#fff;--fg:#1a1a1a;--muted:#5b6470;--accent:#2557d6;--card:#f5f6f8;--border:#dfe2e7}
@media (prefers-color-scheme:dark){:root{--bg:#14161a;--fg:#e8e9ec;--muted:#9aa3af;--accent:#7aa2ff;--card:#1d2026;--border:#2c3038}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:1rem/1.6 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
main,header,footer{max-width:44rem;margin:0 auto;padding:1rem}
header nav a{margin-right:1rem}
a{color:var(--accent)}
h1{line-height:1.2;font-size:2rem}
h2{margin-top:2rem;font-size:1.3rem}
.lead{font-size:1.15rem;color:var(--muted)}
.card{background:var(--card);border:1px solid var(--border);border-radius:.5rem;padding:1rem;margin:1rem 0}
.card h2{margin-top:0}
.btn{display:inline-block;background:var(--accent);color:var(--bg);padding:.6rem 1.1rem;border-radius:.4rem;text-decoration:none;font-weight:600}
span.btn{opacity:.7;cursor:default}
pre{background:var(--card);border:1px solid var(--border);border-radius:.5rem;padding:1rem;overflow-x:auto;font-size:.85rem}
code{word-break:break-all}
table{border-collapse:collapse;width:100%}
th,td{border:1px solid var(--border);padding:.4rem .6rem;text-align:left;vertical-align:top}
.small,footer{color:var(--muted);font-size:.9rem}