/* =========================================================
   Subject Pages Layout — الشريط الجانبي وبطاقة الاختبار
   (هذا الملف يغطي كل الأصناف التي يستخدمها math.html/science.html/
   english.html ومحرك quiz.js ولم تكن معرّفة في بقية ملفات assets/)
   ========================================================= */

/* ---------- Two-column layout (sidebar + content) ---------- */
.layout{
  display:grid;
  grid-template-columns:240px 1fr;
  max-width:var(--container-width);
  margin:0 auto;
  align-items:start;
  gap:10px;
}

main{
  padding:32px 24px 80px;
  min-width:0;
}

.sidebar{
  position:sticky;
  top:90px;
}

.sidebar .nav-title{
  font-size:.75rem;
  color:var(--text-muted);
  letter-spacing:.04em;
  margin:18px 8px 6px;
  text-transform:uppercase;
  font-weight:700;
}
.sidebar .nav-title:first-child{margin-top:0;}

.sidebar a{
  border-radius:var(--radius-sm);
  border-bottom:none !important;
  margin-bottom:2px;
  transition:var(--transition);
}
.sidebar a:hover{background:var(--primary-light);color:var(--primary-color);}
.sidebar a.current,
.sidebar a.active{background:var(--primary-color);color:#fff;}

/* ---------- Topic sections ---------- */
section.topic{margin-bottom:34px;scroll-margin-top:90px;}
section.topic h2{
  font-size:1.3rem;
  border-bottom:2px solid var(--border-color);
  padding-bottom:10px;
  margin-bottom:14px;
  display:flex;align-items:center;gap:10px;
  color:var(--primary-dark);
}
.tag{
  font-size:.68rem;
  background:var(--primary-light);
  color:var(--primary-color);
  padding:3px 10px;
  border-radius:var(--radius-sm);
  font-weight:700;
}

.lesson-box p{margin:.4em 0;}
.lesson-box ul{margin:.4em 0;padding-inline-start:22px;}
.example{
  background:var(--background-color);
  border-inline-start:4px solid var(--accent-color);
  padding:12px 16px;
  border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  margin:12px 0;
  font-size:.95rem;
}

/* English LTR inline snippets inside RTL question text */
.ltr{direction:ltr;display:inline-block;font-family:'Courier New',monospace;}

/* ---------- Quiz widget ---------- */
.quiz-wrap{
  background:var(--surface-color);
  border:1px solid var(--border-color);
  border-radius:var(--radius-lg);
  overflow:hidden;
  box-shadow:var(--shadow-sm);
}
.quiz-ticket-head{
  background:linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color:#fff;
  padding:14px 20px;
  display:flex;justify-content:space-between;align-items:center;
  font-weight:700;
}
.quiz-ticket-head .qcount{
  font-size:.85rem;
  background:rgba(255,255,255,.18);
  padding:4px 12px;
  border-radius:999px;
}
.quiz-body{padding:26px 24px 22px;}
.q-stem{font-size:1.08rem;font-weight:700;margin-bottom:18px;min-height:2.6em;color:var(--text-color);}

.choices{display:grid;gap:10px;margin-bottom:18px;}
.choice{
  border:1.5px solid var(--border-color);
  border-radius:var(--radius-sm);
  padding:12px 16px;
  cursor:pointer;
  background:#fff;
  font-size:.98rem;
  font-family:inherit;
  transition:var(--transition);
  display:flex;gap:10px;align-items:center;
  width:100%;
  text-align:right;
  color:var(--text-color);
  appearance:none;
  -webkit-appearance:none;
}
.choice:focus-visible{
  outline:3px solid var(--primary-color);
  outline-offset:2px;
}
.choice[aria-disabled="true"]{cursor:default;}
.choice .letter{
  width:26px;height:26px;border-radius:50%;
  border:1.5px solid var(--text-muted);
  display:flex;align-items:center;justify-content:center;
  font-size:.75rem;font-weight:700;
  flex-shrink:0;color:var(--text-muted);
}
.choice:hover{border-color:var(--primary-color);background:var(--primary-light);}
.choice:active{transform:scale(.99);}
.choice.disabled{cursor:default;}
.choice.faded{opacity:.5;}
.choice.correct{border-color:var(--success-color);background:#e8f7ee;}
.choice.correct .letter{background:var(--success-color);border-color:var(--success-color);color:#fff;}
.choice.wrong{border-color:var(--danger-color);background:#fdecec;}
.choice.wrong .letter{background:var(--danger-color);border-color:var(--danger-color);color:#fff;}

.feedback{
  display:none;
  border-radius:var(--radius-sm);
  padding:14px 16px;
  font-size:.94rem;
  margin-bottom:16px;
  border:1px solid var(--border-color);
}
.feedback.show{display:block;}
.feedback.good{background:#e8f7ee;border-color:#bfe0cd;}
.feedback.bad{background:#fdecec;border-color:#f3c6cc;}
.feedback .fb-title{font-weight:700;margin-bottom:4px;display:flex;align-items:center;gap:6px;}
.feedback .fb-title.good-text{color:#156a43;}
.feedback .fb-title.bad-text{color:#b02a37;}

.quiz-actions{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;}
.btn-ghost{background:transparent;color:var(--primary-dark);border:1.5px solid var(--border-color);}
.btn-ghost:hover{border-color:var(--primary-color);color:var(--primary-color);}
.btn:disabled{opacity:.4;cursor:not-allowed;}

.score-pill{
  font-size:.85rem;color:var(--text-muted);
  background:var(--background-color);padding:6px 14px;border-radius:999px;
}

.paper-source{
  font-size:.78rem;color:var(--text-muted);margin-top:8px;padding-top:8px;
  border-top:1px dashed var(--border-color);
}

@media (max-width:840px){
  .layout{grid-template-columns:1fr;}
  .sidebar{position:static;}
  main{padding:20px 16px 60px;}
}