.hamburger {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    line-height: 1;
}

.nav-links {
    display: flex;
    flex-direction: row;
    align-items: center;
    flex: 1;
}

@media (max-width: 768px) {
    html, body { overflow-x: hidden; max-width: 100%; }
    .hamburger { display: block; }
    .nav-container { flex-wrap: wrap; }
    .nav-links {
        display: none;
        flex-direction: column;
        align-items: stretch;
        width: 100%;
        flex: none;
        padding: 0.25rem 0;
    }
    .nav-links.open { display: flex; }
    .nav-container .nav-links a {
        padding: 0.65rem 1rem;
        margin: 0;
        border-bottom: 1px solid #444;
    }
    .nav-container .nav-links .signout-button,
    .nav-container .nav-links .about-button {
        margin-left: 0;
        margin-top: 0.25rem;
        width: 100%;
        text-align: center;
    }
}