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

html {
    font-size: 62.5%;
}

body {
    font-family: 'Mulish', sans-serif;
}

header {
    width: 100%;
    height: 70px;
    padding: 0 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 3px 3px 15px #7D9D9C;
}

header .header--author {
    display: flex;
    align-items: center;
}

header .header--author h3 {
    font-size: 1.6rem;
    color: #2C3333;
    font-weight: 900;
}

header .header--author img {
    width: 40px;
    margin-right: 10px;
    border-radius: 50%;
}

header nav ul {
    display: flex;
    align-items: center;
    gap: 30px;
}

header nav ul li {
    list-style: none;
}

header nav ul li a {
    font-size: 1.4rem;
    color: #2C3333;
    text-decoration: none;
    font-weight: 400;
}

header nav ul li a:hover {
    text-decoration: underline;
}


/* ================================================== main ================================================== */


main {
    width: 100%;
    height: 88vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

main button {
    color: white;
    font-size: 1.6rem;
    word-spacing: 2px;
    letter-spacing: .5px;
    padding: 12px 20px;
    border: 1px solid white;
    border-radius: 8px;
    background-color: #316B83;
    font-family: 'Oswald', sans-serif;
    cursor: pointer;
}


/* ================================================ media query ================================================ */


@media (min-width: 768px) {
    header {
        height: 80px;
        padding: 0 80px;
    }

    header .header--author h3 {
        font-size: 2rem;
    }

    header .header--author img {
        width: 50px;
    }

    header nav ul {
        gap: 60px;
    }

    header nav ul li a {
        font-size: 1.6rem;
    }
}