.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 2.5vw;
    color: var(--primary-color);
    text-decoration: none;
    border: 0.15em solid var(--primary-color);
    padding: 0.5em;
    display: inline-block;
    text-align: center;
    box-shadow: 0 0 0.5em var(--primary-color);
    transition: all 0.3s ease;
}

.logo:hover {
    box-shadow: 0 0 1em var(--primary-color);
}

nav {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    flex-wrap: wrap;
}

nav a {
    color: var(--text-color);
    text-decoration: none;
    margin-left: 1.5vw;
    font-size: 1vw;
    transition: all 0.3s ease;
    position: relative;
    padding: 0.5em 1em;
    border: 1px solid transparent;
}

nav a:hover {
    color: var(--primary-color);
    text-shadow: 0 0 0.5em var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: 0 0 0.5em var(--primary-color);
}

@media (max-width: 768px) {
    .header {
        flex-direction: column;
        align-items: center;
    }

    nav {
        margin-top: 1em;
        justify-content: center;
    }

    .logo,
    nav a {
        font-size: 16px;
    }

    nav a {
        margin: 0.5em;
    }
}