:root { color-scheme: light dark; --bg:#F4F1FF; --card:#fff; --text:#1d1d2b; --muted:#5d5d73; --primary:#6c4cf0; }
@media (prefers-color-scheme: dark) { :root { --bg:#14121f; --card:#1f1b2e; --text:#ecebf5; --muted:#a6a3bd; --primary:#9a85ff; } }
* { box-sizing: border-box; }
body { margin:0; background:var(--bg); color:var(--text); font-family:'Cairo',system-ui,-apple-system,'Segoe UI',Tahoma,sans-serif; line-height:1.9; padding:16px; }
main { max-width:760px; margin:0 auto; background:var(--card); border-radius:20px; padding:24px 22px 28px; box-shadow:0 4px 24px rgba(0,0,0,.08); }
h1 { font-size:24px; margin:0 0 4px; }
h2 { font-size:18px; margin:26px 0 6px; color:var(--primary); }
p, li { font-size:15px; }
.muted { color:var(--muted); font-size:13px; }
a { color:var(--primary); }
.back { display:inline-block; margin-bottom:14px; font-weight:700; text-decoration:none; }