/* Header membership button only; keep newsletter form colors unchanged. */
html[data-theme="light"] .gh-head .head-member-actions .button-primary {
    background-color: #16253A;
    color: #FFFFFF;
}

html[data-theme="dark"] .gh-head .head-member-actions .button-primary {
    background-color: #FFFFFF;
    color: #16253A;
}

html[data-theme] .gh-head .head-member-actions .button-primary:hover {
    opacity: 1;
    text-decoration: underline;
    text-underline-offset: 0.2em;
}

html[data-theme] .gh-head .head-member-actions .button-primary:focus-visible {
    outline: 2px solid currentColor;
    outline-offset: -5px;
}