:root{--quiz-bg: #ffffff;--quiz-border: #e5e7eb;--quiz-text-color: #1f2937;--accent-color: #2563eb;--accent-bg-light: #eff6ff;--quiz-correct-color: #15803d;--quiz-correct-bg: #dcfce7;--quiz-correct-border: #86efac;--quiz-incorrect-color: #b91c1c;--quiz-incorrect-bg: #fee2e2;--quiz-incorrect-border: #fca5a5;--btn-bg: #111827;--btn-text: #ffffff;--btn-hover-bg: #374151}html.dark{--quiz-bg: #1f2937;--quiz-border: #374151;--quiz-text-color: #f3f4f6;--accent-color: #60a5fa;--accent-bg-light: rgba(37, 99, 235, .15);--quiz-correct-color: #4ade80;--quiz-correct-bg: rgba(21, 128, 61, .2);--quiz-correct-border: #15803d;--quiz-incorrect-color: #f87171;--quiz-incorrect-bg: rgba(185, 28, 28, .2);--quiz-incorrect-border: #991b1b;--btn-bg: #f3f4f6;--btn-text: #111827;--btn-hover-bg: #e5e7eb}.multiple-choice-quiz{background-color:var(--quiz-bg);color:var(--quiz-text-color);border:1px solid var(--quiz-border);border-radius:16px;padding:2rem;margin:2rem 0;box-shadow:0 10px 15px -3px #00000008,0 4px 6px -2px #00000008}.question-block{margin-bottom:2.5rem;padding-bottom:2rem;border-bottom:1px dashed var(--quiz-border)}.question-block:last-of-type{border-bottom:none;padding-bottom:0;margin-bottom:1rem}.question-block p{margin-top:0;margin-bottom:1.2rem;font-weight:700;font-size:1.15rem;line-height:1.4}.options-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:.75rem}.options-list li{border:2px solid var(--quiz-border);border-radius:12px;transition:all .2s ease;background-color:transparent}.options-list li:hover{border-color:var(--accent-color);transform:translateY(-1px)}.options-list li.selected{border-color:var(--accent-color);background-color:var(--accent-bg-light)}.options-list label{cursor:pointer;display:flex;align-items:center;padding:1rem;width:100%;height:100%}.option-text{flex-grow:1;font-weight:500}.options-list input[type=radio]{-moz-appearance:none;appearance:none;-webkit-appearance:none;width:20px;height:20px;border:2px solid var(--quiz-border);border-radius:50%;margin-right:1rem;display:grid;place-content:center;transition:.2s;flex-shrink:0}.options-list input[type=radio]:before{content:"";width:10px;height:10px;border-radius:50%;transform:scale(0);transition:.2s transform ease-in-out;background-color:#fff}.options-list input[type=radio]:checked{background-color:var(--accent-color);border-color:var(--accent-color)}.options-list input[type=radio]:checked:before{transform:scale(1)}.options-list li.correct{border-color:var(--quiz-correct-border)!important;background-color:var(--quiz-correct-bg)!important;color:var(--quiz-correct-color)}.options-list li.correct input[type=radio]{background-color:var(--quiz-correct-color);border-color:var(--quiz-correct-color)}.options-list li.incorrect{border-color:var(--quiz-incorrect-border)!important;background-color:var(--quiz-incorrect-bg)!important;color:var(--quiz-incorrect-color);opacity:.8}.options-list li.incorrect .option-text{text-decoration:line-through}.feedback-icon{margin-left:.5rem;font-size:1.2rem}.quiz-results{margin-top:3rem;padding:2rem;border-radius:12px;background-color:var(--accent-bg-light);text-align:center;border:1px solid var(--quiz-border);animation:fadeIn .5s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.quiz-results h3{margin-top:0;font-size:1.75rem;color:var(--quiz-text-color)}.multiple-choice-quiz button{font-size:1rem;font-weight:700;padding:.85rem 2rem;border-radius:8px;border:none;background-color:var(--btn-bg);color:var(--btn-text);cursor:pointer;margin-top:2rem;width:100%;transition:transform .1s ease,opacity .2s}@media(min-width:640px){.multiple-choice-quiz button{width:auto}}.multiple-choice-quiz button:hover{background-color:var(--btn-hover-bg);transform:translateY(-2px)}.multiple-choice-quiz button:active{transform:translateY(0)}.multiple-choice-quiz button.btn-secondary{background-color:transparent;border:2px solid var(--quiz-border);color:var(--quiz-text-color);margin-top:1rem}.multiple-choice-quiz button.btn-secondary:hover{border-color:var(--accent-color);color:var(--accent-color);background-color:transparent}.quiz-progress-bar{height:6px;background-color:var(--quiz-border);border-radius:3px;margin-bottom:2rem;position:relative;overflow:visible}.progress-fill{height:100%;background-color:var(--accent-color);border-radius:3px;transition:width .3s ease}.progress-text{display:block;text-align:right;font-size:.8rem;color:var(--quiz-text-color);margin-top:.5rem;font-weight:600}.question-text{font-size:1.3rem!important;margin-bottom:2rem!important}.active-card{border:none;animation:slideUp .3s ease-out}.quiz-navigation{display:flex;justify-content:space-between;gap:1rem;margin-top:2rem;padding-top:1.5rem;border-top:1px solid var(--quiz-border)}.btn-next{background-color:var(--accent-color)!important;color:#fff!important;margin-top:0!important}.btn-next:disabled{opacity:.5;cursor:not-allowed;background-color:var(--quiz-border)!important}.btn-prev{background-color:transparent!important;color:var(--quiz-text-color)!important;border:1px solid var(--quiz-border)!important;margin-top:0!important}.btn-prev:disabled{opacity:0;pointer-events:none}.disabled-label{cursor:default!important}.review-title{margin-top:3rem;margin-bottom:1.5rem;font-size:1.2rem;border-bottom:2px solid var(--quiz-border);padding-bottom:.5rem}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}