/* MCQ Container - Responsive Fixed-Width Box */
.dwu-mcq-container {
    width: 100%;
    max-width: 750px;
    margin: 0 auto 30px;
    font-family: 'Inter', sans-serif;
    background: #ffffff;
    border-radius: 16px;
    box-shadow: 0 8px 30px rgba(15, 23, 42, 0.04);
    padding: clamp(20px, 4vw, 40px);
    border: 1px solid #e2e8f0;
}

.dwu-q-title {
    font-family: 'Plus Jakarta Sans', sans-serif;
    color: #0f172a; /* Explicit dark navy to fix dark-mode visibility */
    font-size: clamp(18px, 3vw, 22px);
    font-weight: 700;
    margin-top: 0;
    margin-bottom: 24px;
    line-height: 1.5;
}

.dwu-options-wrapper {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.dwu-option {
    display: flex;
    align-items: center;
    padding: clamp(14px, 2vw, 18px) 20px;
    background: #f8fafc;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    color: #334155;
    font-size: 16px;
    font-weight: 500;
}

/* Hover effect with Primary Blue */
.dwu-option:hover:not(.disabled) {
    border-color: #2563eb;
    background: #eff6ff;
    color: #0f172a;
}

/* Validation Classes */
.dwu-option.correct {
    background: #f0fdf4;
    border-color: #16a34a;
    color: #166534;
    font-weight: 600;
}

.dwu-option.incorrect {
    background: #fef2f2;
    border-color: #dc2626;
    color: #991b1b;
}

/* Disable clicks after selection */
.dwu-option.disabled {
    pointer-events: none;
}

/* Feedback Box */
.dwu-feedback {
    display: none;
    margin-top: 20px;
    padding: 16px;
    border-radius: 10px;
    font-size: 14.5px;
    background: #f1f5f9;
    border-left: 4px solid #2563eb;
    color: #475569;
    line-height: 1.6;
    animation: fadeIn 0.4s ease forwards;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}