Computer MCQs | part-4 with Explanations * { margin: 0; padding: 0; box-sizing: border-box; } body { background: #f1f5f9; font-family: 'Segoe UI', 'Inter', system-ui, -apple-system, sans-serif; padding: 2rem 1rem; color: #0f172a; } .container { max-width: 1200px; margin: 0 auto; } .quiz-header { background: linear-gradient(135deg, #0f2b3d 0%, #1e4a6e 100%); border-radius: 1.5rem; padding: 1.5rem 2rem; margin-bottom: 2rem; color: white; box-shadow: 0 10px 20px -5px rgba(0,0,0,0.2); } .quiz-header h1 { font-size: 1.8rem; font-weight: 700; display: flex; align-items: center; gap: 12px; flex-wrap: wrap; } .badge { background: #f59e0b; color: #0f2b3d; font-size: 0.85rem; padding: 4px 14px; border-radius: 40px; font-weight: 600; } .sub { margin-top: 10px; opacity: 0.85; font-size: 0.9rem; } .stats-bar { background: #fff; border-radius: 60px; padding: 12px 20px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; margin-bottom: 25px; box-shadow: 0 4px 12px rgba(0,0,0,0.08); border: 1px solid #e5e7eb; } .progress { background: #eef2ff; color: #1e3a8a; padding: 24px 24px; border-radius: 30px; font-size: 15px; font-weight: 600; } .score { background: #fef3c7; color: #92400e; padding: 8px 18px; border-radius: 30px; font-size: 15px; font-weight: 600; } .reset-btn { background: #ef4444; color: #fff; border: none; padding: 8px 22px; border-radius: 30px; cursor: pointer; font-weight: 600; transition: 0.3s; } .reset-btn:hover { background: #dc2626; transform: translateY(-2px); } .questions-grid { display: flex; flex-direction: column; gap: 1.5rem; } .card { background: white; border-radius: 1.25rem; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08); overflow: hidden; border: 1px solid #e2edf7; } .card-header { background: #fafcff; padding: 1rem 1.5rem; border-bottom: 2px solid #eef2ff; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; align-items: baseline; } .q-num { font-weight: 800; color: #0f3b5c; font-size: 1rem; } .q-text { font-weight: 600; color: #0c4a6e; font-size: 1rem; line-height: 1.4; flex: 1; } .options-area { padding: 1.2rem 1.5rem 0.8rem 1.5rem; display: flex; flex-direction: column; gap: 0.7rem; } .option { display: flex; align-items: center; gap: 14px; background: #ffffff; padding: 8px 16px; border-radius: 60px; border: 1px solid #dee7f0; cursor: pointer; transition: all 0.15s; } .option:hover { background: #f8fafc; border-color: #94a3b8; } input[type="radio"] { accent-color: #2563eb; width: 18px; height: 18px; cursor: pointer; } .option-label { font-weight: 500; color: #1e293b; flex: 1; cursor: pointer; font-size: 0.95rem; } .card-footer { padding: 0.8rem 1.5rem 1.3rem 1.5rem; background: #fefefe; border-top: 1px solid #eef2ff; display: flex; flex-direction: column; gap: 12px; } .feedback { font-size: 0.85rem; font-weight: 600; padding: 6px 14px; border-radius: 30px; display: inline-block; width: fit-content; } .feedback.correct { background: #d1fae5; color: #065f46; } .feedback.wrong { background: #fee2e2; color: #991b1b; } .feedback.neutral { background: #f1f5f9; color: #475569; } .explanation { background: #f0f9ff; padding: 12px 16px; border-radius: 1rem; font-size: 0.85rem; color: #0369a1; border-left: 4px solid #0ea5e9; display: none; } .explanation.show { display: block; } .explanation strong { color: #0c4a6e; } .toggle-explanation { background: none; border: none; color: #3b82f6; font-weight: 600; font-size: 0.75rem; cursor: pointer; padding: 4px 12px; border-radius: 20px; transition: 0.1s; } .toggle-explanation:hover { background: #eef2ff; text-decoration: underline; } .action-bar { display: flex; justify-content: flex-start; align-items: center; flex-wrap: wrap; gap: 10px; } @media (max-width: 700px) { .quiz-header h1 { font-size: 1.3rem; } .option { padding: 6px 12px; } .stats-bar { flex-direction: column; border-radius: 20px; text-align: center; } .progress, .score, .reset-btn { width: 100%; } } footer { text-align: center; margin-top: 2rem; font-size: 0.75rem; color: #5b6e8c; background: transparent; } 📚 MCQ part 4 { const escapedOpt = opt.replace(/'/g, "\\'").replace(/"/g, '"'); const radioId = `q${q.id}_opt_${opt.replace(/\s/g, '').replace(/[\(\)]/g, '')}`; const checkedAttr = (selectedVal === opt) ? 'checked' : ''; optionsHtml += ` ${opt} `; }); const explanationClass = showExp ? "show" : ""; html += ` Q${q.id}. ${q.text} ${optionsHtml} ${feedbackText} ${showExp ? "Hide Explanation" : "📖 Show Explanation"} 💡 Explanation: ${q.explanation} `; } container.innerHTML = html; updateUIStats(); document.querySelectorAll('.toggle-explanation').forEach(btn => { const qid = parseInt(btn.getAttribute('data-id')); btn.removeEventListener('click', (e) => {}); btn.addEventListener('click', (e) => { e.stopPropagation(); toggleExplanation(qid); }); }); } window.selectAnswer = function(qid, selectedValue) { answersState[qid].selected = selectedValue; renderQuestions(); saveToLocalStorage(); }; function toggleExplanation(qid) { answersState[qid].showExplanation = !answersState[qid].showExplanation; renderQuestions(); saveToLocalStorage(); } function resetQuiz() { for (let q of questions) { answersState[q.id] = { selected: null, showExplanation: false }; } renderQuestions(); saveToLocalStorage(); } function saveToLocalStorage() { const toSave = {}; for (let q of questions) { toSave[q.id] = { selected: answersState[q.id].selected, showExplanation: answersState[q.id].showExplanation }; } localStorage.setItem('quizMCQ_set4', JSON.stringify(toSave)); } function loadFromLocalStorage() { const saved = localStorage.getItem('quizMCQ_set4'); if (saved) { try { const parsed = JSON.parse(saved); for (let id in parsed) { const qid = parseInt(id); if (answersState[qid]) { answersState[qid].selected = parsed[id].selected || null; answersState[qid].showExplanation = parsed[id].showExplanation || false; } } renderQuestions(); } catch(e) {} } else { renderQuestions(); } } document.getElementById('resetAll')?.addEventListener('click', () => { resetQuiz(); }); loadFromLocalStorage();