.question-number {
    display: inline-block;
    width: 30px;
    height: 30px;
    line-height: 30px;
    text-align: center;
    border-radius: 50%;
    background: linear-gradient(135deg, #10b981, #34d399);
    color: #052e2b;
    font-weight: 700;
    margin-right: 10px;
}
.mcq-container {
    background: linear-gradient(180deg, #ffffff 0%, #f8fffb 100%);
    border-radius: 18px;
    box-shadow: 0 12px 30px rgba(15, 23, 42, 0.1);
    padding: 28px 26px 32px;
    margin-bottom: 30px;
    border: 1px solid rgba(16, 185, 129, 0.35);
}
.question-card {
    border: 1px solid #e2e8f0;
    border-radius: 14px;
    padding: 22px 22px 20px;
    margin-bottom: 24px;
    background: #fdfdfd;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.question-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(15, 23, 42, 0.08);
}
.question-text {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 16px;
}
.options-container {
    margin-top: 15px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}
@media (max-width: 768px) {
    .options-container { grid-template-columns: 1fr; }
}
.option {
    padding: 14px 14px 12px;
    border: 1.5px solid #e2e8f0;
    border-radius: 10px;
    display: flex;
    align-items: center;
    background: #fff;
    cursor: pointer;
    transition: all 0.2s ease;
}
.option:hover {
    border-color: rgba(16, 185, 129, 0.45);
    background: #f0fdf4;
    box-shadow: 0 4px 10px rgba(16, 185, 129, 0.08);
}
.option.selected {
    border-color: #10b981;
    background: rgba(16, 185, 129, 0.08);
}
.option-label {
    display: inline-block;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, #10b981, #34d399);
    color: #052e2b;
    text-align: center;
    line-height: 36px;
    font-weight: 700;
    margin-right: 15px;
    flex-shrink: 0;
}
.option.correct {
    background-color: rgba(40, 167, 69, 0.12);
    border-color: #28a745;
}
.option.incorrect {
    background-color: rgba(220, 53, 69, 0.12);
    border-color: #dc3545;
}
.option.correct .option-label { background: #28a745; color: #fff; }
.option.incorrect .option-label { background: #dc3545; color: #fff; }
.explanation {
    margin-top: 12px;
    padding: 12px;
    background: #f0fdf4;
    border-radius: 8px;
    border-left: 4px solid #10b981;
    display: none;
}
.explanation.show { display: block; }
.mcq-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1rem;
}
.mcq-score {
    margin-top: 1rem;
    padding: 0.9rem 1rem;
    border-radius: 10px;
    background: linear-gradient(135deg, #e8f5e9, #f0fdf4);
    border: 1px solid #86efac;
    font-weight: 600;
    display: none;
}
.mcq-container-advanced {
    background: linear-gradient(180deg, #ffffff 0%, #faf5ff 100%);
    border: 1px solid rgba(124, 58, 237, 0.35);
    box-shadow: 0 12px 30px rgba(91, 33, 182, 0.12);
}
.mcq-container-advanced .mcq-advanced-title { color: #5b21b6; }
.mcq-container-advanced .question-number {
    background: linear-gradient(135deg, #7c3aed, #a78bfa);
    color: #fff;
}
.mcq-container-advanced .question-card {
    border-color: #e9d5ff;
    background: #fefcff;
}
.mcq-container-advanced .question-card:hover {
    box-shadow: 0 10px 20px rgba(124, 58, 237, 0.12);
}
.mcq-container-advanced .option:hover {
    border-color: rgba(124, 58, 237, 0.45);
    background: #f5f3ff;
    box-shadow: 0 4px 10px rgba(124, 58, 237, 0.1);
}
.mcq-container-advanced .option.selected {
    border-color: #7c3aed;
    background: rgba(124, 58, 237, 0.08);
}
.mcq-container-advanced .option-label {
    background: linear-gradient(135deg, #7c3aed, #a78bfa);
    color: #fff;
}
.mcq-container-advanced .explanation {
    background: #f5f3ff;
    border-left-color: #7c3aed;
}
.mcq-container-advanced .btn-check-advanced {
    background: linear-gradient(135deg, #7c3aed, #a78bfa);
    border: none;
    color: #fff;
}
.mcq-container-advanced .btn-check-advanced:hover {
    background: linear-gradient(135deg, #6d28d9, #8b5cf6);
    color: #fff;
}
.mcq-container-advanced .mcq-score {
    background: linear-gradient(135deg, #ede9fe, #f5f3ff);
    border-color: #c4b5fd;
    color: #5b21b6;
}
.qa-section {
    margin-bottom: 1rem;
    padding: 1.2rem;
    border: 1px solid #d1fae5;
    border-radius: 16px;
    background: linear-gradient(135deg, #ffffff 0%, #f8fffb 100%);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.08);
}
.qa-section .question { font-weight: 600; }
.qa-section .answer {
    padding-left: 2.5rem;
    border-left: 3px solid #d1fae5;
    margin-top: 0.6rem;
}
.difficulty-badge {
    padding: 0.15rem 0.7rem;
    border-radius: 20px;
    font-size: 0.72rem;
    margin-left: 0.5rem;
    font-weight: 600;
    text-transform: capitalize;
}
.difficulty-badge.easy {
    background: #dcfce7;
    color: #166534;
    border: 1px solid #86efac;
}
.difficulty-badge.medium {
    background: #fef3c7;
    color: #92400e;
    border: 1px solid #fcd34d;
}
.difficulty-badge.hard {
    background: #fce7f3;
    color: #9d174d;
    border: 1px solid #f9a8d4;
}