:root { --bg: #F7F8FA; --ink: #3A3A3A; --muted: #6C757D; --line: #E3E7EE; --accent: #1D6FB8; --card: #FFFFFF; --blue: #5AAEE0; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #0A1120; --ink: #E8EDF5; --muted: #9AA8BC; --line: #1E2A40; --accent: #7CC0EC; --card: #121A2D; }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: 'IBM Plex Sans Arabic', system-ui, sans-serif; font-weight: 400; line-height: 1.75; }
header { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; max-width: 760px; margin: 0 auto; padding: 20px 16px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 500; font-size: 18px; }
.mark { width: 28px; height: 28px; border-radius: 9px; background: var(--blue); }
nav { display: flex; gap: 16px; font-size: 15px; }
main { max-width: 760px; margin: 0 auto; padding: 0 16px 32px; }
article { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 24px 22px; margin-bottom: 20px; scroll-margin-top: 16px; }
h1 { font-size: 28px; font-weight: 500; margin: 0 0 4px; }
h2 { font-size: 19px; font-weight: 500; margin: 26px 0 6px; }
.meta { color: var(--muted); margin: 0 0 8px; }
ul { padding-inline-start: 22px; }
li { margin: 6px 0; }
strong { font-weight: 500; }
a { color: var(--accent); }
footer { max-width: 760px; margin: 0 auto; padding: 0 16px 40px; color: var(--muted); font-size: 14px; text-align: center; }