/* ========== Quiz Module ========== */
.quiz-container { margin-top: 24px; }
.quiz-toggle-btn {
  width: 100%; padding: 14px; background: var(--bg-card); border: 1px dashed var(--border);
  border-radius: var(--radius-md); color: var(--text-secondary); font-size: 14px;
  font-weight: 600; cursor: pointer; transition: all 0.2s; display: flex;
  align-items: center; justify-content: center; gap: 8px; font-family: var(--font-sans);
}
.quiz-toggle-btn:hover { border-color: var(--accent-blue); color: var(--accent-blue); background: rgba(59,130,246,0.04); }
.quiz-toggle-btn .quiz-icon { font-size: 16px; }

.quiz-panel {
  display: none; background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-md); padding: 20px; margin-top: 12px;
}
.quiz-panel.open { display: block; animation: fadeInUp 0.3s ease forwards; }

.quiz-toolbar {
  display: flex; align-items: center; justify-content: space-between;
  padding-bottom: 14px; border-bottom: 1px solid var(--border); margin-bottom: 16px;
}
.quiz-toolbar h3 { font-size: 15px; font-weight: 700; display: flex; align-items: center; gap: 8px; }
.quiz-score-bar { display: flex; align-items: center; gap: 12px; font-size: 13px; }
.quiz-score-bar .score { color: var(--accent-green); font-weight: 700; font-size: 16px; }
.quiz-score-bar .total { color: var(--text-muted); }

.quiz-progress { display: flex; gap: 6px; margin-bottom: 16px; }
.quiz-dot {
  width: 8px; height: 8px; border-radius: 50%; background: var(--border);
  transition: all 0.2s; cursor: pointer;
}
.quiz-dot.current { background: var(--accent-blue); box-shadow: 0 0 0 3px rgba(59,130,246,0.2); }
.quiz-dot.correct { background: var(--accent-green); }
.quiz-dot.wrong { background: var(--accent-red); }

.question-nav {
  display: flex; gap: 4px; overflow-x: auto; padding-bottom: 8px; margin-bottom: 12px;
}
.question-tab {
  padding: 4px 10px; border-radius: 4px; font-size: 11px; font-weight: 600;
  background: rgba(255,255,255,0.02); border: 1px solid var(--border);
  color: var(--text-muted); cursor: pointer; white-space: nowrap; transition: all 0.15s;
}
.question-tab.active { border-color: var(--accent-blue); color: var(--accent-blue); background: rgba(59,130,246,0.1); }
.question-tab.answered { background: rgba(16,185,129,0.08); border-color: rgba(16,185,129,0.3); color: var(--accent-green); }
.question-tab.wrong { background: rgba(239,68,68,0.08); border-color: rgba(239,68,68,0.3); color: var(--accent-red); }

.question-body { padding: 8px 0; }
.q-number { color: var(--accent-blue); font-weight: 700; margin-right: 6px; }
.q-text { font-size: 14px; font-weight: 600; line-height: 1.6; margin-bottom: 14px; }
.q-difficulty { font-size: 10px; padding: 2px 6px; border-radius: 3px; font-weight: 500; }
.q-difficulty.easy { background: rgba(16,185,129,0.1); color: var(--accent-green); }
.q-difficulty.medium { background: rgba(245,158,11,0.1); color: var(--accent-orange); }
.q-difficulty.hard { background: rgba(239,68,68,0.1); color: var(--accent-red); }

.q-options { display: flex; flex-direction: column; gap: 8px; }
.q-option {
  display: flex; align-items: flex-start; gap: 10px; padding: 10px 14px;
  background: rgba(255,255,255,0.02); border: 1px solid var(--border);
  border-radius: var(--radius-sm); cursor: pointer; transition: all 0.2s; font-size: 13px;
  line-height: 1.6;
}
.q-option:hover { background: rgba(59,130,246,0.06); border-color: rgba(59,130,246,0.2); }
.q-option.selected { border-color: var(--accent-blue); background: rgba(59,130,246,0.1); }
.q-option.correct { border-color: var(--accent-green) !important; background: rgba(16,185,129,0.1) !important; }
.q-option.wrong { border-color: var(--accent-red) !important; background: rgba(239,68,68,0.1) !important; }
.q-option.disabled { cursor: default; pointer-events: none; }

.opt-label {
  min-width: 24px; height: 24px; border-radius: 50%; border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center; font-size: 11px;
  font-weight: 600; flex-shrink: 0; transition: all 0.2s;
}
.q-option.correct .opt-label { border-color: var(--accent-green); background: var(--accent-green); color: white; }
.q-option.wrong .opt-label { border-color: var(--accent-red); background: var(--accent-red); color: white; }

.q-explain {
  margin-top: 12px; padding: 12px 14px; background: rgba(59,130,246,0.04);
  border-radius: var(--radius-sm); font-size: 12px; color: var(--text-secondary);
  line-height: 1.7; display: none;
}
.q-explain.show { display: block; }
.q-explain strong { color: var(--text-primary); }

.q-actions { display: flex; gap: 8px; margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--border); }

@media (max-width: 900px) {
  .quiz-toolbar { flex-direction: column; gap: 10px; align-items: flex-start; }
}