:root {
  --bg: #f6f5fa;
  --surface: #ffffff;
  --ink: #1d1838;
  --muted: #5d5878;
  --line: #e4e1ef;
  --brand: #2c2170;
  --brand-soft: #ebe8f7;
  --accent: #f86126;
  --ok: #4f7d0c;
  --ok-soft: #eef6dd;
  --note: #fff4dc;
  --note-ink: #6b4a00;
  --radius: 16px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #13111f; --surface: #1d1a2e; --ink: #ecebf5; --muted: #a9a5c2; --line: #2e2a45;
    --brand: #b5abff; --brand-soft: #2a2550; --accent: #ff8a5c; --ok: #a6d65a; --ok-soft: #26331a;
    --note: #3a2f14; --note-ink: #f5d999;
  }
}
:root[data-theme="dark"] {
  --bg: #13111f; --surface: #1d1a2e; --ink: #ecebf5; --muted: #a9a5c2; --line: #2e2a45;
  --brand: #b5abff; --brand-soft: #2a2550; --accent: #ff8a5c; --ok: #a6d65a; --ok-soft: #26331a;
  --note: #3a2f14; --note-ink: #f5d999;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 17px/1.65 "IBM Plex Sans Arabic", system-ui, -apple-system, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}
b { font-weight: 600; }
a { color: var(--brand); }

.top {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; gap: 12px;
  padding: 10px 16px; background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: blur(8px); border-bottom: 1px solid var(--line);
}
.top .logo { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--ink); text-decoration: none; }
.top .logo img { height: 24px; width: auto; background: #fff; border-radius: 6px; padding: 3px 6px; box-sizing: content-box; }
.top .logo span { font-size: 15px; color: var(--muted); font-weight: 600; }
@media (max-width: 420px) { .top .logo span { display: none; } }
.top .spacer { flex: 1; }
.btn {
  border: 1px solid var(--line); background: var(--surface); color: var(--ink);
  font: inherit; font-size: 15px; padding: 7px 14px; border-radius: 999px; cursor: pointer; text-decoration: none;
}
.btn.primary { background: var(--brand); border-color: var(--brand); color: var(--surface); }
.btn:focus-visible, a:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 16px; }
.hero { padding: 40px 0 20px; }
.hero h1 { font-size: clamp(30px, 6vw, 46px); line-height: 1.2; margin: 0 0 10px; color: var(--brand); }
.hero p { margin: 0; max-width: 62ch; color: var(--muted); font-size: 18px; }

.toc { display: grid; gap: 14px; margin: 18px 0 8px; }
.toc-group p { margin: 0 0 6px; font-size: 14px; color: var(--muted); font-weight: 600; }
.toc ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.toc a {
  display: inline-flex; align-items: center; gap: 8px; text-decoration: none; color: var(--ink);
  background: var(--surface); border: 1px solid var(--line); border-radius: 999px; padding: 6px 14px 6px 6px; font-size: 15px;
}
[dir="rtl"] .toc a { padding: 6px 6px 6px 14px; }
.toc a:hover { border-color: var(--brand); }
.num {
  display: inline-grid; place-items: center; min-width: 26px; height: 26px; border-radius: 999px;
  background: var(--brand-soft); color: var(--brand); font-size: 13px; font-weight: 700;
}
.tick { color: var(--ok); font-weight: 700; }

.group { margin-top: 36px; }
.group h2 { font-size: 24px; margin: 0 0 14px; display: flex; align-items: baseline; gap: 10px; }
.group h2 small { font-size: 14px; color: var(--muted); font-weight: 400; }

.lesson {
  display: grid; gap: 0; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden; margin-bottom: 18px; scroll-margin-top: 70px;
}
.lesson .media { background: #0d0b16; display: grid; place-items: center; }
.lesson video { display: block; width: 100%; background: #0d0b16; }
.lesson.phone video { max-height: 78vh; aspect-ratio: 9 / 16; width: auto; max-width: 100%; }
.lesson.wide video { aspect-ratio: 16 / 9; }
.lesson .text { padding: 18px 18px 22px; }
.meta { display: flex; align-items: center; gap: 10px; margin: 0 0 6px; color: var(--muted); font-size: 14px; }
.done { color: var(--ok); background: var(--ok-soft); padding: 1px 10px; border-radius: 999px; font-weight: 600; }
.lesson h3 { margin: 0 0 4px; font-size: 22px; line-height: 1.35; }
.about { margin: 0 0 12px; color: var(--muted); }
.note { margin: 0 0 12px; background: var(--note); color: var(--note-ink); padding: 8px 12px; border-radius: 10px; font-size: 15px; }
.lesson h4 { margin: 14px 0 6px; font-size: 14px; text-transform: uppercase; letter-spacing: .04em; color: var(--brand); }
[dir="rtl"] .lesson h4 { letter-spacing: 0; }
.lesson ol { margin: 0; padding-inline-start: 22px; }
.lesson li { margin-bottom: 7px; }
.lesson li::marker { color: var(--accent); font-weight: 700; }
b[dir="ltr"] { unicode-bidi: isolate; white-space: nowrap; }
[lang="ar"] { font-family: "IBM Plex Sans Arabic", system-ui, sans-serif; }

@media (min-width: 820px) {
  .lesson.phone { grid-template-columns: 300px 1fr; }
  .lesson.phone video { max-height: 534px; }
  .lesson.wide { grid-template-columns: minmax(0, 3fr) minmax(0, 2fr); align-items: start; }
  .lesson .text { padding: 24px 28px; }
}

.help {
  margin: 40px 0 24px; padding: 22px; border-radius: var(--radius);
  background: var(--brand-soft); border: 1px solid var(--line);
}
.help h2 { margin: 0 0 6px; font-size: 20px; }
.help p { margin: 0 0 14px; }
footer { padding: 0 0 40px; color: var(--muted); font-size: 14px; }