:root{--bg:#0B0F14;--card:#121821;--text:#E8EEF5;--muted:#93A1B3;--brand:#22D3EE}
@media (prefers-color-scheme: light){:root{--bg:#F5F7FA;--card:#FFFFFF;--text:#0E1117;--muted:#4B5563;--brand:#0891B2}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif}
main{max-width:760px;margin:0 auto;padding:32px 16px 64px}
.k{color:var(--brand);font:600 12px/1 ui-monospace,Menlo,monospace;letter-spacing:.2em;text-transform:uppercase}
h1{font-size:32px;margin:8px 0 4px}h2{font-size:19px;margin:28px 0 6px}
p,li{color:var(--muted)}strong{color:var(--text)}a{color:var(--brand)}
.card{background:var(--card);border-radius:18px;padding:18px 20px;margin-top:18px}
nav a{margin-right:16px}