:root {
  --bg: #f6f4ee;
  --card: #ffffff;
  --ink: #1b2340;
  --muted: #5d6585;
  --line: #e1ddd0;
  --primary: #2b3a8c;
  --primary-ink: #ffffff;
  --accent: #e8a33d;
  --ok: #1f8a5b;
  --ok-bg: #e2f4ea;
  --bad: #c8453b;
  --bad-bg: #fbe6e3;
  --radius: 16px;
  --shadow: 0 6px 24px rgba(27, 35, 64, 0.08);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12162b;
    --card: #1b2140;
    --ink: #eef0fa;
    --muted: #a3abd0;
    --line: #2b3260;
    --primary: #8b9bff;
    --primary-ink: #12162b;
    --accent: #f0b35a;
    --ok: #53d39a;
    --ok-bg: #173a2d;
    --bad: #ff8a80;
    --bad-bg: #402024;
    --shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Tajawal", "Segoe UI", Tahoma, system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.8;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: var(--primary); }
.wrap { width: 100%; max-width: 860px; margin: 0 auto; padding: 0 16px; }

/* الرأس */
.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 10;
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-top: 10px; padding-bottom: 10px; flex-wrap: wrap; }
.brand { font-weight: 800; font-size: 22px; color: var(--primary); text-decoration: none; display: flex; align-items: center; gap: 8px; }
.brand .dot { width: 14px; height: 14px; border-radius: 50%; background: var(--accent); display: inline-block; }
.nav { display: flex; gap: 4px; flex-wrap: wrap; }
.nav a { text-decoration: none; color: var(--muted); padding: 4px 12px; border-radius: 999px; font-size: 15px; white-space: nowrap; }
.nav a:hover { background: var(--bg); }
.nav a.active { background: var(--primary); color: var(--primary-ink); }

main { flex: 1; padding: 24px 0 40px; }
.site-footer { border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; padding: 18px 0; text-align: center; }

/* عناصر عامة */
h1 { font-size: 30px; line-height: 1.4; margin: 0 0 8px; }
h2 { font-size: 22px; margin: 0 0 8px; }
.lead { color: var(--muted); font-size: 18px; margin: 0 0 20px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.tile { display: block; text-decoration: none; color: inherit; transition: transform .15s; }
.tile:hover { transform: translateY(-2px); }
.tile h3 { margin: 0 0 4px; color: var(--primary); font-size: 20px; }
.tile p { margin: 0; color: var(--muted); font-size: 15px; }
.stats { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); margin-top: 6px; }
.stat { text-align: center; padding: 12px 8px; border-radius: 12px; background: var(--bg); }
.stat b { display: block; font-size: 28px; color: var(--primary); line-height: 1.3; }
.stat span { font-size: 14px; color: var(--muted); }

.btn { font: inherit; cursor: pointer; border: 0; border-radius: 12px; padding: 10px 22px; background: var(--primary); color: var(--primary-ink); font-weight: 700; text-decoration: none; display: inline-block; }
.btn.ghost { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-top: 14px; }
select { font: inherit; padding: 8px 12px; border-radius: 10px; border: 1px solid var(--line); background: var(--card); color: var(--ink); }
.chip { font: inherit; cursor: pointer; padding: 6px 16px; border-radius: 999px; border: 2px solid var(--line); background: var(--card); color: var(--ink); }
.chip.on { border-color: var(--primary); background: var(--primary); color: var(--primary-ink); }
.note { font-size: 14px; color: var(--muted); }

/* الاختبار */
.q-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; font-size: 14px; color: var(--muted); }
.tag { background: var(--bg); padding: 2px 12px; border-radius: 999px; }
.timer { font-variant-numeric: tabular-nums; font-weight: 800; color: var(--primary); font-size: 18px; }
.timer.low { color: var(--bad); }
.bar { height: 8px; background: var(--bg); border-radius: 99px; overflow: hidden; margin: 10px 0 16px; }
.bar > i { display: block; height: 100%; background: var(--accent); transition: width .25s; }
.q-text { font-size: 20px; font-weight: 700; white-space: pre-line; margin-bottom: 14px; }
.opts { display: grid; gap: 10px; }
.opt { font: inherit; text-align: right; cursor: pointer; padding: 12px 16px; border-radius: 12px; border: 2px solid var(--line); background: var(--card); color: var(--ink); }
.opt:hover:not(:disabled) { border-color: var(--primary); }
.opt.sel { border-color: var(--primary); background: var(--bg); }
.opt.ok { border-color: var(--ok); background: var(--ok-bg); }
.opt.bad { border-color: var(--bad); background: var(--bad-bg); }
.opt:disabled { cursor: default; }
.explain { margin-top: 14px; padding: 12px 16px; border-radius: 12px; background: var(--bg); border-inline-start: 5px solid var(--accent); }
.explain b { color: var(--primary); }

.score { text-align: center; }
.score .big { font-size: 56px; font-weight: 800; color: var(--primary); line-height: 1.2; }
.review { margin-top: 18px; display: grid; gap: 12px; }
.review .item { border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; background: var(--card); }
.review .item .q { font-weight: 700; white-space: pre-line; }
.review .yours { color: var(--bad); }
.review .right { color: var(--ok); }
.empty { text-align: center; color: var(--muted); padding: 30px 10px; }

@media (max-width: 520px) {
  h1 { font-size: 25px; }
  .q-text { font-size: 18px; }
  body { font-size: 16px; }
}