:root { color-scheme: light dark; --primary: #0D9488; }
body { margin: 0; font-family: "IBM Plex Sans Arabic", system-ui, -apple-system, "Segoe UI", sans-serif; line-height: 1.7; background: #F8FAFC; color: #0F172A; }
main { max-width: 760px; margin: 0 auto; padding: 32px 20px 64px; }
h1 { color: var(--primary); margin-bottom: 4px; }
h2 { margin-top: 32px; font-size: 1.15rem; }
a { color: var(--primary); }
.muted { color: #475569; margin-top: 0; }
.lang { text-align: end; }
@media (prefers-color-scheme: dark) {
  body { background: #0B1220; color: #E2E8F0; }
  .muted { color: #94A3B8; }
  :root { --primary: #2DD4BF; }
}