* {
    margin: 0px;
    padding: 0px;
    font-family: 'Ubuntu', sans-serif;
    font-size: 15px;
}

:root {
    --bluedark: #06004D;
    --blueligth: #d6e7ff;
}

/************ HEADER ***************/
header {
    background-color: var(--bluedark);
    padding: 25px 0px;
}
header img{
    width: 150px;
}

/************ MAIN ***************/
.main {
    background-image: url("../img/construction-site.jpg");
    background-repeat : no-repeat;
    background-size : cover;
    background-attachment: fixed;
    background-position: center;
    padding: 80px 0;
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.main_cards {
    display: flex;
    flex-flow: row wrap;
    justify-content: center;
    gap: 40px;
}

.main_cards_article {
    background: white;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 15px;
    padding: 25px;
    width: 75%;
    height: 100%;
    border-radius: 5px;
    box-shadow: 0px 1px 10px var(--bluedark);
    transition: .3s ease-in-out;
}

.main_cards_article:hover {
    transform: scale(1.05);
}

.main_cards_article a {
    text-decoration: none;
    font-weight: bold;
    background-color: var(--blueligth);
    color: var(--bluedark);
    border-radius: 10px;
    padding: 8px;
}

.main_cards_article a:hover {
    background-color: var(--bluedark);
    color: white;
}

/************ FOOTER ***************/
footer {
    border-top: 25px solid var(--bluedark);
    display: flex;
    flex-flow: row wrap;
    justify-content: start;
    padding: 30px;
    gap: 0 30px;
}

.footer_section {
    line-height: 10px;
}

.footer_section_content {
    border-top: 2px solid var(--bluedark);
    padding: 20px 0;
}

/************ ARRIBA MOBILE FIRST -> ABAJO PANTALLA ESCRITORIO ***************/

@media only screen and (min-width: 770px) {
    .main_cards {
        justify-content: center;
    }

    .main_cards_article {
        width: 25%;
        height: 310px;
        padding: 35px 30px;
    }

    .main_cards_article h3{
        font-size: 1.5rem;
    }

    footer {
        justify-content: space-evenly;
    }
}