header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 2rem;
}

.logo {
    font-size: 3.8rem;
    color: var(--primary-color);
}

nav a {
    color: var(--text-color);
    text-decoration: none;
    margin-left: 1.5rem;
    font-size: 2rem;
    transition: color 0.8s;
}

nav a:hover {
    color: var(--second-color);
}

.red {
    color: var(--_3th-color);
}