#cabecera-ebooks {
    background-color: var(--gris-esparta);
    padding: 135px 0px 50px;
}

#cabecera-ebooks h1 {
    margin: 0;
    text-transform: uppercase;
    z-index: 2;
}

.ebook-card {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
    aspect-ratio: 4/3;
    background-color: #e0e0e0;
}

.ebook-thumbnail {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.ebook-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 8px;
}

.ebook-card h3 {
    position: relative;
    z-index: 1;
    margin-left: 20px;
    margin-right: 20px;
    font-weight: 700;
    text-transform: uppercase;
    color: #000;
}

#ebooks-marketing {
    padding: 50px 0;
}

#ebooks-marketing h2 {
    text-align: center;
    text-transform: uppercase;
}

#ebooks-sectores h2 {
    text-transform: uppercase;
}

#ebooks-sectores {
    background-color: var(--gris-esparta);
    padding: 150px 0 50px 0;
}

#ebooks-marketing-grid {
    margin-bottom: -100px;
}

.sectores-ebooks {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: flex-end;
}

.sectores-ebooks li {
    margin: 0;
}

.sectores-ebooks a {
    display: inline-block;
    padding: 8px 20px;
    border: 1px solid #333;
    border-radius: 6px;
    text-decoration: none;
    color: #333;
    background-color: transparent;
    font-weight: 600;
    transition: all 0.3s ease;
}

.sectores-ebooks a:hover,
.sectores-ebooks a.active {
    background-color: #333;
    color: #fff;
}

@media (max-width: 768px) {
    #ebooks-grid {
        margin-top: 50px;
    }
}