:root{
  --primary:#6d28d9;--primary-2:#8b5cf6;--accent:#f59e0b;
  --success:#10b981;--danger:#ef4444;--wa:#25D366;
  --bg:#f5f3ff;--card:#ffffff;--text:#1e1b4b;--muted:#7c7a99;
  --line:#ede9fe;--gold:#fbbf24;--silver:#cbd5e1;--bronze:#f59e0b;
  --radius:20px;--shadow:0 10px 40px rgba(109,40,217,.08);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  font-family:"Segoe UI",Tahoma,system-ui,-apple-system,sans-serif;
  background:linear-gradient(135deg,#f5f3ff 0%,#eef2ff 100%);
  color:var(--text);line-height:1.7;min-height:100vh;
  display:flex;justify-content:center;padding:20px 16px;font-size:17px;
}
.app{width:100%;max-width:840px}
.screen{display:none;animation:fade .3s ease}
.screen.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}

/* ===== CARD ===== */
.card{
  background:var(--card);border-radius:var(--radius);padding:32px;
  box-shadow:var(--shadow);border:1px solid rgba(109,40,217,.06);
}
.login-card{text-align:center;padding:40px 28px}
.hero{text-align:center;margin-bottom:24px}
.hero h1{margin:10px 0 4px;font-size:1.6rem;color:var(--primary)}
.logo-circle{
  width:64px;height:64px;border-radius:50%;margin:0 auto 12px;
  background:linear-gradient(135deg,var(--primary),var(--primary-2));
  display:flex;align-items:center;justify-content:center;font-size:32px;
  box-shadow:0 8px 24px rgba(109,40,217,.25);
}
.logo-circle.big{width:88px;height:88px;font-size:44px;margin-bottom:14px}
.badge{
  display:inline-block;background:#f3f0ff;color:var(--primary);
  padding:5px 14px;border-radius:999px;font-size:13px;font-weight:700;
  margin-bottom:8px;
}
h1{font-size:1.5rem;margin:6px 0 10px;color:var(--primary);font-weight:800}
.muted{color:var(--muted);font-size:.95rem}

/* ===== FORM ===== */
.field{display:block;margin:24px 0 16px;text-align:right}
.field span{display:block;font-weight:700;margin-bottom:8px;font-size:.95rem}
input[type=text]{
  width:100%;padding:16px 18px;border:2px solid var(--line);
  border-radius:14px;font-size:1.05rem;text-align:right;
  background:#fafaff;transition:.2s;font-family:inherit;
}
input[type=text]:focus{
  outline:none;border-color:var(--primary-2);background:#fff;
  box-shadow:0 0 0 4px rgba(139,92,246,.12);
}

/* ===== BUTTONS ===== */
.btn{
  display:block;width:100%;padding:15px 24px;border:none;border-radius:14px;
  font-size:1rem;font-weight:700;cursor:pointer;text-align:center;
  text-decoration:none;transition:.2s;margin-top:12px;font-family:inherit;
}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(109,40,217,.3)}
.btn-secondary{background:#f1f5f9;color:var(--text);border:1px solid #e2e8f0}
.btn-secondary:hover{background:#e2e8f0}
.btn-success{background:linear-gradient(135deg,#10b981,#059669);color:#fff}
.btn-success:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(16,185,129,.3)}
.btn-whatsapp{background:linear-gradient(135deg,#25D366,#1ea851);color:#fff}
.btn-whatsapp:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(37,211,102,.3)}
.big-btn{margin-top:20px;padding:18px 24px;font-size:1.05rem}
.hidden{display:none!important}
.login-note{margin-top:16px;color:var(--muted);font-size:.85rem}

/* ===== QUIZ HEADER ===== */
.quiz-header{
  display:flex;justify-content:space-between;align-items:center;gap:12px;
  flex-wrap:wrap;background:var(--card);padding:16px 20px;
  border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:14px;
  border:1px solid rgba(109,40,217,.06);
}
.qh-left{display:flex;flex-direction:column;gap:2px}
.exam-title{font-weight:800;color:var(--primary);font-size:1.05rem;display:block}
.timer{
  background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;
  padding:9px 18px;border-radius:999px;font-weight:800;font-size:1rem;
  font-variant-numeric:tabular-nums;min-width:96px;text-align:center;
}
.timer.danger{background:linear-gradient(135deg,#ef4444,#dc2626);animation:pulse 1s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.6}}

.progress-wrap{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.progress-bar{flex:1;height:10px;background:#ede9fe;border-radius:10px;overflow:hidden}
#progressFill{
  height:100%;width:0%;
  background:linear-gradient(90deg,var(--primary),var(--accent));
  transition:width .4s;border-radius:10px;
}
.progress-text{font-size:.9rem;color:var(--muted);font-weight:700;white-space:nowrap}

/* ==================================================
   السؤال والاختيارات — من الشمال لليمين (LTR)
   ================================================== */
.question-container{
  background:var(--card);border-radius:var(--radius);padding:28px;
  box-shadow:var(--shadow);min-height:280px;border:1px solid rgba(109,40,217,.06);
}

.question,
.question p.stem,
.qnum,
.option,
.option .letter,
.option .opt-text,
.opt-text {
  direction: ltr !important;
  text-align: left !important;
  unicode-bidi: embed !important;
}

.question p.stem{
  font-size:1.25rem;font-weight:700;margin:0 0 22px;
  color:#312e81;line-height:2.1;
  display:flex;align-items:flex-start;gap:12px;
}

.qnum{
  display:inline-flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;
  min-width:34px;height:34px;border-radius:50%;font-size:14px;font-weight:800;
  flex-shrink:0;
}

.option{
  display:flex;align-items:center;gap:12px;background:#fafaff;
  border:2px solid var(--line);padding:18px 20px;border-radius:14px;
  margin-bottom:11px;cursor:pointer;transition:.15s;font-size:1.15rem;
}
.option:hover{background:#f3f0ff;border-color:#c4b5fd;transform:translateX(3px)}
.option.selected{border-color:var(--primary);background:#ede9fe;box-shadow:0 0 0 4px rgba(109,40,217,.1)}
.option.correct{border-color:var(--success);background:#dcfce7}
.option.wrong{border-color:var(--danger);background:#fee2e2}
.option .letter{
  background:linear-gradient(135deg,var(--primary-2),var(--primary));color:#fff;
  min-width:34px;height:34px;border-radius:10px;display:flex;align-items:center;
  justify-content:center;font-weight:800;font-size:15px;flex-shrink:0;
}
.option.selected .letter{background:var(--primary)}
.option.correct .letter{background:var(--success)}
.option.wrong .letter{background:var(--danger)}

.opt-text{flex:1}

/* MathJax */
mjx-container{
  direction: ltr !important;
  max-width:100%;
  overflow-x:auto;
  overflow-y:hidden;
}

.quiz-footer{display:flex;gap:10px;margin-top:16px}
.quiz-footer .btn{flex:1;margin-top:0}

/* ===== RESULT ===== */
.result-header{text-align:center;margin-bottom:12px}
.result-icon{font-size:56px;margin-bottom:6px}
.score{
  font-size:1.8rem;text-align:center;margin:20px 0;font-weight:800;
  color:var(--primary);padding:22px;background:#fafaff;
  border-radius:16px;border:2px dashed var(--line);
}
.review{max-height:60vh;overflow-y:auto;padding-left:6px;margin-bottom:12px}
.review-item{
  border-right:5px solid var(--primary);padding:14px 16px;margin-bottom:12px;
  background:#fafaff;border-radius:12px;font-size:1rem;line-height:1.9;
}
.review-item.correct{border-color:var(--success);background:#f0fdf4}
.review-item.wrong{border-color:var(--danger);background:#fef2f2}
.review-item .rev-head{font-weight:800;margin-bottom:8px;font-size:1rem}
.review-item .rev-line{margin:4px 0}
.review-item .rev-correct{color:var(--success);font-weight:700}
.review-item .rev-wrong{color:var(--danger);font-weight:700}

/* اتجاه المراجعة LTR */
.review-item,
.review-item .rev-head,
.review-item .rev-line{
  direction: ltr !important;
  text-align: left !important;
  unicode-bidi: embed !important;
}

/* ===== STAGE SWITCHER ===== */
.stage-links{
  display:grid;grid-template-columns:repeat(3,1fr);gap:10px;
  margin-bottom:24px;padding-bottom:20px;border-bottom:2px dashed var(--line);
}
.stage-links a{
  text-align:center;padding:14px 10px;background:#fafaff;color:var(--primary);
  border-radius:14px;text-decoration:none;font-size:.9rem;font-weight:800;
  border:2px solid var(--line);transition:.2s;
}
.stage-links a:hover{background:#f3f0ff;border-color:#c4b5fd;transform:translateY(-3px)}
.stage-links a.active{
  background:linear-gradient(135deg,var(--primary),var(--primary-2));
  color:#fff;border-color:transparent;box-shadow:0 6px 20px rgba(109,40,217,.25);
}

/* ===== LESSONS ===== */
.lessons{margin-top:12px}
.unit-block{margin-bottom:26px}
.unit-title{
  background:linear-gradient(135deg,var(--primary),var(--primary-2));
  color:#fff;padding:14px 20px;border-radius:14px;font-weight:800;
  font-size:1rem;margin-bottom:12px;box-shadow:0 6px 20px rgba(109,40,217,.2);
}
.lesson-item{
  display:flex;justify-content:space-between;align-items:center;gap:12px;
  padding:15px 20px;background:#fafaff;border:2px solid var(--line);
  border-radius:14px;margin-bottom:10px;cursor:pointer;transition:.2s;
  text-decoration:none;color:inherit;font-weight:700;font-size:.95rem;
}
.lesson-item:hover{
  background:#f3f0ff;border-color:var(--primary-2);transform:translateX(-4px);
  box-shadow:0 6px 18px rgba(109,40,217,.1);
}
.lesson-item .arrow{
  background:var(--primary);color:#fff;width:32px;height:32px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;font-weight:800;
  flex-shrink:0;font-size:14px;
}
.exam-item{background:#fff7ed;border-color:#fdba74;color:#9a3412}
.exam-item:hover{background:#ffedd5;border-color:#fb923c}
.exam-item .arrow{background:#ea580c}

/* ===== DASHBOARD ===== */
.dash-stats{
  display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:20px;
}
.stat-card{
  background:linear-gradient(135deg,#fafaff,#f3f0ff);
  border-radius:14px;padding:16px;text-align:center;
  border:2px solid var(--line);
}
.stat-card .stat-num{font-size:1.6rem;font-weight:900;color:var(--primary)}
.stat-card .stat-lbl{font-size:.8rem;color:var(--muted);font-weight:700;margin-top:4px}

.leaderboard{margin:14px 0}
.leader-item{
  display:flex;justify-content:space-between;align-items:center;gap:12px;
  padding:16px 18px;background:#fafaff;border:2px solid var(--line);
  border-radius:14px;margin-bottom:10px;font-weight:700;transition:.2s;
}
.leader-item:hover{transform:translateX(-3px);box-shadow:0 6px 18px rgba(109,40,217,.08)}
.leader-item.gold{
  background:linear-gradient(135deg,#fef3c7,#fde68a);
  border-color:#f59e0b;box-shadow:0 8px 24px rgba(245,158,11,.25);
}
.leader-item.silver{
  background:linear-gradient(135deg,#f1f5f9,#e2e8f0);border-color:#94a3b8;
}
.leader-item.bronze{
  background:linear-gradient(135deg,#fed7aa,#fdba74);border-color:#ea580c;
}
.leader-item .rank{
  background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;
  width:40px;height:40px;border-radius:50%;display:flex;align-items:center;
  justify-content:center;font-size:1rem;font-weight:900;flex-shrink:0;
}
.leader-item.gold .rank{background:linear-gradient(135deg,#f59e0b,#d97706);font-size:1.2rem}
.leader-item.silver .rank{background:linear-gradient(135deg,#94a3b8,#64748b);font-size:1.2rem}
.leader-item.bronze .rank{background:linear-gradient(135deg,#ea580c,#c2410c);font-size:1.2rem}
.leader-item .name{flex:1;text-align:right;font-size:.98rem}
.leader-item .date{display:block;color:var(--muted);font-size:.78rem;font-weight:400;margin-top:2px}
.leader-item .pct{
  color:var(--primary);font-weight:900;font-size:1.15rem;
  font-variant-numeric:tabular-nums;min-width:60px;text-align:left;
}
.leader-empty{text-align:center;color:var(--muted);padding:40px 20px;font-size:.95rem}

/* ===== ADMIN MODE ===== */
body.admin-mode::before{
  content:"⚠️ وضع المعلم (Admin)";
  position:fixed;top:0;left:0;right:0;
  background:linear-gradient(90deg,#ef4444,#dc2626);color:#fff;
  text-align:center;padding:8px;font-weight:800;font-size:.9rem;z-index:9999;
}
body.admin-mode{padding-top:44px}
.mq-del-btn{
  display:block;width:100%;margin-top:18px;padding:12px;
  background:#fef2f2;color:#dc2626;border:2px dashed #fca5a5;
  border-radius:12px;font-weight:800;cursor:pointer;font-family:inherit;
  font-size:.92rem;transition:.2s;
}
.mq-del-btn:hover{background:#fee2e2;border-color:#dc2626}

/* ===== RESPONSIVE ===== */
@media (max-width:640px){
  body{padding:12px;font-size:16px}
  .card{padding:22px 18px;border-radius:16px}
  .login-card{padding:32px 20px}
  h1{font-size:1.3rem}
  .logo-circle.big{width:72px;height:72px;font-size:36px}
  .question-container{padding:18px;min-height:240px}
  .question p.stem{font-size:1.1rem;line-height:2}
  .option{padding:15px 16px;font-size:1.05rem}
  .quiz-header{padding:13px 15px}
  .timer{font-size:.95rem;padding:7px 14px}
  .exam-title{font-size:.95rem}
  .btn{padding:13px 18px;font-size:.95rem}
  .quiz-footer{flex-direction:column}
  .score{font-size:1.4rem;padding:16px}
  .stage-links{grid-template-columns:repeat(2,1fr);gap:8px}
  .stage-links a{padding:12px 8px;font-size:.85rem}
  .dash-stats{grid-template-columns:1fr;gap:8px}
  .leader-item{padding:13px 14px}
  .leader-item .rank{width:36px;height:36px;font-size:.9rem}
  .leader-item .pct{font-size:1rem;min-width:50px}
  mjx-container{font-size:.95em!important}
}