:root {
  --bg: #ffffff;
  --fg: #16191d;
  --muted: #5b636e;
  --line: #e4e7eb;
  --accent: #0f766e;
  --max: 44rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101316;
    --fg: #e8eaed;
    --muted: #9aa3ae;
    --line: #262b31;
    --accent: #5eead4;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 2.5rem 1.25rem 5rem;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, "Segoe UI", "Noto Sans Arabic", Tahoma, sans-serif;
  font-size: 17px;
  line-height: 1.75;
}

main, header, footer { max-width: var(--max); margin-inline: auto; }

header { border-bottom: 1px solid var(--line); padding-bottom: 1.25rem; margin-bottom: 2rem; }

.brand {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: .02em;
  text-decoration: none;
  color: var(--fg);
}

nav { margin-top: .75rem; display: flex; gap: 1.25rem; flex-wrap: wrap; }
nav a { color: var(--muted); text-decoration: none; font-size: .95rem; }
nav a:hover, nav a[aria-current="page"] { color: var(--accent); }

h1 { font-size: 1.9rem; line-height: 1.35; margin: 0 0 .5rem; }
h2 { font-size: 1.2rem; margin: 2.25rem 0 .5rem; }

.updated { color: var(--muted); font-size: .9rem; margin: 0 0 2rem; }

ul { padding-inline-start: 1.35rem; }
li { margin-bottom: .4rem; }

a { color: var(--accent); }

.note {
  border-inline-start: 3px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  padding: .85rem 1rem;
  margin: 1.5rem 0;
  font-size: .95rem;
}

footer {
  margin-top: 4rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .9rem;
}

/* Language switch: both versions live in the page; CSS hides the inactive one. */
[lang="en"] { direction: ltr; text-align: left; }
[lang="ar"] { direction: rtl; text-align: right; }