body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #1e1e1e;
    color: #ffffff;
}

.header {
    text-align: center;
    padding: 20px 0;
    background-color: #282828;
}

.logo {
    max-width: 150px;
    height: auto;
}

.bookshelf {
    display: grid;
    gap: 20px;
    padding: 20px;
}

.book {
    background-color: #333333;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.5);
    overflow: hidden;
    text-align: center;
    transition: transform 0.2s;
}

.book img {
    width: 100%;
    height: auto;
}

.book h3 {
    margin: 10px 0;
    padding: 0 10px;
    font-size: 1.1em;
    color: #ffffff;
}

.book:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.7);
}

@media (min-width: 600px) {
    .bookshelf {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 900px) {
    .bookshelf {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 1200px) {
    .bookshelf {
        grid-template-columns: repeat(4, 1fr);
    }
}