:root {
  --bg: #0e1218;
  --bg-elev: #171d27;
  --bg-card: #1c2430;
  --line: #2c3646;
  --text: #e8edf4;
  --muted: #9aa7b8;
  --accent: #d4a017;
  --accent-2: #3d8b6e;
  --accent-soft: rgba(212, 160, 23, .14);
  --danger-soft: rgba(201, 92, 64, .16);
  --link: #e8c15a;
  --shadow: 0 12px 40px rgba(0,0,0,.35);
  --radius: 18px;
  color-scheme: dark;
}
[data-theme="light"] {
  --bg: #f4efe6;
  --bg-elev: #fffdf8;
  --bg-card: #ffffff;
  --line: #e2d8c8;
  --text: #1c2430;
  --muted: #5c6776;
  --accent: #9a6b00;
  --accent-2: #1f6b4f;
  --accent-soft: rgba(154, 107, 0, .1);
  --danger-soft: rgba(163, 62, 40, .12);
  --link: #7a5200;
  --shadow: 0 10px 30px rgba(60, 40, 10, .08);
  color-scheme: light;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: "Cairo", "Noto Naskh Arabic", "Segoe UI", Tahoma, sans-serif;
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(61,139,110,.18), transparent 50%),
    radial-gradient(900px 400px at 100% 0%, rgba(212,160,23,.12), transparent 45%),
    var(--bg);
  color: var(--text);
  line-height: 1.8;
}
a { color: var(--link); text-underline-offset: 3px; }
a:hover { color: var(--accent); }
.wrap { width: min(1120px, calc(100% - 32px)); margin-inline: auto; }
header.site {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(16px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 12px 0;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: inherit; }
.mark {
  width: 42px; height: 42px; border-radius: 12px;
  background: linear-gradient(145deg, var(--accent), #8a5a00);
  display: grid; place-items: center; font-weight: 800; color: #1a1406; font-size: 18px;
  box-shadow: 0 6px 16px rgba(212,160,23,.25);
}
.brand-text strong { display: block; font-size: 15px; }
.brand-text span { display: block; font-size: 12px; color: var(--muted); }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.btn {
  border: 1px solid var(--line); background: var(--bg-elev); color: var(--text);
  border-radius: 999px; padding: 7px 14px; cursor: pointer; font: inherit; font-size: 14px;
}
.btn:hover, .btn:focus-visible { border-color: var(--accent); outline: none; }
.hero { padding: 48px 0 28px; }
.hero h1 { font-size: clamp(28px, 4vw, 46px); line-height: 1.35; margin: 0 0 12px; }
.lede { font-size: 18px; color: var(--muted); max-width: 46rem; }
.pills { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.pill {
  background: var(--accent-soft); color: var(--accent); border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--line));
  border-radius: 999px; padding: 4px 12px; font-size: 13px; font-weight: 600;
}
.section { padding: 12px 0 36px; }
.section h2 { font-size: 26px; margin: 0 0 8px; }
.hint { color: var(--muted); margin: 0 0 20px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 16px; }
.card {
  display: block; text-decoration: none; color: inherit;
  background: var(--bg-card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow); transition: transform .18s, border-color .18s;
  min-height: 170px;
}
.card:hover { transform: translateY(-3px); border-color: color-mix(in srgb, var(--accent) 50%, var(--line)); }
.card h3 { margin: 8px 0 6px; font-size: 22px; }
.meta { color: var(--muted); font-size: 14px; margin: 0; }
.badge {
  display: inline-block; font-size: 12px; font-weight: 700; border-radius: 999px;
  padding: 2px 10px; background: color-mix(in srgb, var(--accent-2) 22%, transparent);
  color: color-mix(in srgb, var(--accent-2) 80%, var(--text));
}
.badge.warn { background: var(--danger-soft); color: #e07a5f; }
.page-head { padding: 32px 0 10px; }
.crumbs { font-size: 14px; color: var(--muted); margin-bottom: 10px; }
.crumbs a { color: inherit; }
.subject { margin: 28px 0; }
.subject h2 {
  background: var(--bg-elev); border: 1px solid var(--line); border-radius: 14px;
  padding: 12px 16px; font-size: 20px;
}
.unit { margin: 16px 0 22px; padding: 4px 2px 4px 0; }
.unit h3 { margin: 0 0 8px; font-size: 18px; color: var(--accent); }
.note { color: var(--muted); font-size: 14px; margin: 0 0 10px; }
ol.lessons { margin: 0; padding: 0 1.3rem 0 0; }
ol.lessons li { margin: 6px 0; padding-inline-start: 4px; }
.callout {
  background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--line));
  border-radius: 16px; padding: 16px 18px; margin: 18px 0 28px;
}
.callout.warn { background: var(--danger-soft); border-color: color-mix(in srgb, #e07a5f 35%, var(--line)); }
footer.site { border-top: 1px solid var(--line); margin-top: 40px; padding: 28px 0 48px; color: var(--muted); font-size: 14px; }
footer.site h2 { color: var(--text); font-size: 16px; margin: 0 0 8px; }
footer.site ul { padding: 0 1.2rem 0 0; margin: 8px 0 0; }
.skip { position: absolute; inset-inline-start: -999px; }
.skip:focus { inset-inline-start: 12px; top: 12px; background: var(--bg-card); padding: 8px 12px; border-radius: 8px; }
@media (max-width: 640px) {
  .brand-text span { display: none; }
  .hero { padding-top: 28px; }
}