:root{--paper:#f5f8fc;--ink:#15244a;--muted:#5a6680;--accent:#1b3b7c;--line:#e0e6f0}
@media (prefers-color-scheme:dark){:root{--paper:#0e1524;--ink:#e8eef9;--muted:#9ba9c4;--accent:#8db7ff;--line:#26334f}}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.65 "Lexend",system-ui,-apple-system,"Segoe UI","IBM Plex Sans Arabic",sans-serif}
main{max-width:760px;margin:0 auto;padding:24px 16px 64px}
h1{font-size:30px;margin:12px 0 4px}h2{font-size:20px;margin:28px 0 6px}
a{color:var(--accent)}.note{color:var(--muted);margin:0}
hr{border:0;border-top:1px solid var(--line);margin:40px 0}
[dir="rtl"]{font-family:"IBM Plex Sans Arabic",system-ui,sans-serif;line-height:1.9}