.fsa-header-auth-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.4rem 1rem;
    font-size: 0.8125rem;
    font-weight: 600;
    line-height: 1.25;
    border-radius: 0.5rem;
    background: var(--color-primary, #fcd307);
    color: var(--color-button-text, #000);
    text-decoration: none;
    white-space: nowrap;
    transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 2px 8px rgba(252, 211, 7, 0.25);
}

.fsa-header-auth-btn:hover,
.fsa-header-auth-btn:focus-visible {
    background: var(--color-primary-dark, #d4b106);
    color: var(--color-button-text, #000);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(252, 211, 7, 0.35);
}

.fsa-header-auth-btn--desktop {
    display: none;
}

.fsa-header-auth-btn--mobile {
    display: inline-flex;
    padding: 0.35rem 0.75rem;
    font-size: 0.75rem;
}

@media (min-width: 1024px) {
    .fsa-header-auth-btn--desktop {
        display: inline-flex;
    }

    .fsa-header-auth-btn--mobile {
        display: none;
    }
}