:root {
    --primary-color: #4e73df;
    --secondary-color: #858796;
}

body {
    background-color: #f8f9fc;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.hero-section {
    background: linear-gradient(135deg, #4e73df 0%, #224abe 100%);
    color: white;
    padding: 80px 0;
    margin-bottom: 30px;
    border-radius: 0 0 50px 50px;
}

.card-book {
    transition: transform 0.2s;
    border: none;
    box-shadow: 0 0.15rem 1.75rem 0 rgba(58, 59, 69, 0.15);
}

.card-book:hover {
    transform: translateY(-5px);
}

.book-cover {
    height: 200px;
    object-fit: cover;
    background-color: #ddd;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: #fff;
}