/* A stable backing isolates brand artwork from the surrounding page color. */
.logo-surface {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    max-width: 100%;
    vertical-align: middle;
    background: #334155;
    border: 1px solid #718096;
    border-radius: 8px;
    overflow: hidden;
}
.logo-surface[data-logo-tone="dark"] { background: #e2e8ee; border-color: #94a3b0; }
.logo-surface[data-logo-tone="light"] { background: #273747; border-color: #718096; }
.logo-surface img.brand-logo-img,
.logo-surface img.auth-split-logo,
.logo-surface img.admin-brand-logo,
.logo-surface img[data-adaptive-logo] {
    display: block;
    background: transparent;
    border: 0;
    padding: 6px 9px;
    object-fit: contain;
    filter: drop-shadow(0 0 0.65px #f1f5f9);
}
.logo-surface[data-logo-tone="dark"] img { filter: drop-shadow(0 0 0.65px #172330); }
.admin-brand-logo { max-height: 44px; max-width: 54px; width: auto; object-fit: contain; }