:root {
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #e2e8f0;
    --gray-600: #475569;
    --gray-700: #334155;
    --blue-500: #3b82f6;
    --success: #22c55e;
    --error: #ef4444;
    --shadow-sm: rgba(0, 0, 0, 0.1);
 }
 
 * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
 }
 
 body {
    background: var(--white);
    color: var(--gray-700);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.5;
 }
 
 main {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
    background: var(--white);
 }
 
 main h1 {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    color: var(--gray-700);
    font-weight: 600;
    text-align: center;
 }
 
 .question-block {
    background: var(--white);
    border: 3px solid var(--gray-100);
    border-radius: 12px;
    padding: 3rem 4rem; /* Increased horizontal padding */
    margin: 0 auto 2rem;
    width: 98%; /* Set width to 90% of main container */
    min-width: 1000px; /* Minimum width */
    box-shadow: 0 4px 16px var(--shadow-sm);
    transition: all 0.3s ease;
 }
 
 .question-block:hover {
    transform: translateY(-2px);
    border-color: var(--blue-500);
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.15);
 }
 
 .question-header {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--gray-100);
 }
 .question-content pre {
   white-space: pre-wrap;
   word-wrap: break-word;
   font-family: inherit;
   font-size: inherit;
   line-height: inherit;
   background: none;
   border: none;
   padding: 0;
   margin: 0;
}
 .question-number {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--blue-500);
    background: var(--gray-50);
    padding: 0.75rem 1.25rem;
    border-radius: 8px;
    min-width: 45px;
    text-align: center;
 }
 
 .question-block h3 {
    font-size: 1.25rem;
    color: var(--gray-700);
    font-weight: 600;
    margin: 0;
    flex: 1;
 }
 
 label {
    display: block;
    background: var(--white);
    border: 2px solid var(--gray-100);
    border-radius: 8px;
    padding: 1rem 1.5rem;
    margin-bottom: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
 }
 
 label:hover {
    border-color: var(--blue-500);
    transform: translateX(5px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.1);
 }
 
 label input[type="radio"] {
    margin-right: 1rem;
 }
 
 label.correct {
    background: #f0fdf4;
    border-color: var(--success);
 }
 
 label.correct::after {
    content: '✓';
    position: absolute;
    right: 1rem;
    color: var(--success);
    font-weight: bold;
 }
 
 label.incorrect {
    background: #fef2f2;
    border-color: var(--error);
 }
 
 label.incorrect::after {
    content: '✗';
    position: absolute;
    right: 1rem;
    color: var(--error);
    font-weight: bold;
 }
 
 .explanation {
    background: var(--gray-50);
    border-left: 4px solid var(--blue-500);
    padding: 1.5rem;
    margin-top: 1.5rem;
    border-radius: 0 8px 8px 0;
 }
 
 .explanation strong {
    color: var(--blue-500);
    font-weight: 600;
    display: block;
    margin-bottom: 0.5rem;
 }
 
 .explanation p {
    color: var(--gray-600);
    font-size: 0.95rem;
    line-height: 1.6;
 }
 
 .submit-button {
    background: var(--blue-500);
    color: var(--white);
    border: none;
    border-radius: 8px;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin: 2rem auto;
    display: block;
 }
 .explanation {
   white-space: pre-wrap;
   word-wrap: break-word;
   margin-top: 10px;
   font-size: 0.9rem;
   line-height: 1.5;
   background-color: #f4f4f4;
   padding: 10px;
   border-radius: 5px;
}

.explanation strong {
   display: block;
   margin-bottom: 5px;
}
 .submit-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
 }
 @media (max-width: 1024px) {
    .question-block {
        width: 95%;
        min-width: unset;
        padding: 2rem;
    }
 }
 @media (max-width: 768px) {
    main {
        padding: 1rem;
    }
    
    .question-block {
        width: 100%;
        padding: 1.5rem;
    }
    
    .question-header {
        flex-direction: column;
        gap: 1rem;
    }
    
    .submit-button {
        width: 100%;
    }
 }