/* General Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f9;
    color: #333;
    line-height: 1.6;
}

header {
    text-align: center;
    background-color: #3b5998;
    color: white;
    padding: 1.5rem;
}

main {
    padding: 1.5rem;
}

.book-grid, .chapter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.book-card, .chapter-card {
    display: block;
    text-align: center;
    padding: 1rem;
    background: white;
    color: #3b5998;
    border: 2px solid #ddd;
    text-decoration: none;
    border-radius: 8px;
    transition: 0.3s;
}

.book-card:hover, .chapter-card:hover {
    background-color: #3b5998;
    color: white;
    transform: scale(1.05);
}

.quiz-content {
    background: white;
    padding: 1rem;
    border: 2px solid #ddd;
    border-radius: 8px;
    margin: auto;
    max-width: 800px;
}

footer {
    text-align: center;
    background-color: #3b5998;
    color: white;
    padding: 1rem;
    margin-top: 1rem;
}

.back-link {
    color: #3b5998;
    text-decoration: none;
    font-weight: bold;
}

.hidden {
    display: none;
}

.question {
    margin: 1rem 0;
}

button {
    background-color: #3b5998;
    color: white;
    padding: 0.5rem 1rem;
    border: none;
    cursor: pointer;
    border-radius: 5px;
    transition: 0.3s;
}

button:hover {
    background-color: #2b4270;
}

#results {
    margin-top: 1rem;
    padding: 1rem;
    background-color: #f0f0f0;
    border: 1px solid #ddd;
    border-radius: 5px;
}
/* General Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    background-color: #f9f9f9;
    color: #333;
    text-align: center;
}

header {
    background-color: #3b5998;
    color: #fff;
    padding: 1rem 0;
}

header h1 {
    margin-bottom: 0.5rem;
    font-size: 1.8rem;
}

header p {
    font-size: 1rem;
}

main {
    padding: 1rem;
}

.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin: 1rem auto;
    max-width: 1200px;
}

.book-card {
    display: block;
    padding: 1rem;
    background-color: #fff;
    border: 1px solid #ddd;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    text-decoration: none;
    color: #3b5998;
    font-weight: bold;
    transition: all 0.3s ease;
    text-transform: capitalize;
}

.book-card:hover {
    background-color: #3b5998;
    color: #fff;
    transform: translateY(-5px);
}

footer {
    margin-top: 2rem;
    padding: 1rem;
    background-color: #3b5998;
    color: #fff;
}

footer p {
    margin: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.5rem;
    }

    header p {
        font-size: 0.9rem;
    }

    .book-grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
        gap: 0.5rem;
    }

    .book-card {
        font-size: 0.9rem;
        padding: 0.8rem;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.2rem;
    }

    header p {
        font-size: 0.8rem;
    }

    .book-grid {
        grid-template-columns: 1fr;
    }

    .book-card {
        font-size: 1rem;
        padding: 0.8rem;
    }
}