.mbg-preferred-source {
    --mbg-ps-text: #273649;
    --mbg-ps-border: #d9e6fb;
    --mbg-ps-bg: linear-gradient(135deg, #ffffff 0%, #f7fbff 52%, #f2f7ff 100%);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    width: 100%;
    box-sizing: border-box;
    margin: 18px 0 20px;
    padding: 14px 16px;
    color: var(--mbg-ps-text);
    background: var(--mbg-ps-bg);
    font-family: inherit;
    line-height: 1.4;
    position: relative;
    overflow: hidden;
}

.mbg-preferred-source::before {
    content: "";
    position: absolute;
    inset: 0 auto 0 0;
    width: 5px;
    background: linear-gradient(180deg, #1380ff 0%, #0f67cf 65%, #e43d30 100%);
}

.mbg-preferred-source::after {
    content: "";
    position: absolute;
    top: -18px;
    right: -18px;
    width: 88px;
    height: 88px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(26,115,232,.10) 0%, rgba(26,115,232,0) 68%);
    pointer-events: none;
}

.mbg-ps-border-minimal {
    border-top: 1px solid var(--mbg-ps-border);
    border-bottom: 1px solid var(--mbg-ps-border);
}

.mbg-ps-border-soft {
    border: 1px solid var(--mbg-ps-border);
    border-radius: 14px;
    box-shadow: 0 8px 20px rgba(19, 63, 122, .08);
}

.mbg-ps-border-none {
    padding-left: 0;
    padding-right: 0;
    background: transparent;
}

.mbg-ps-heading {
    min-width: 0;
    margin: 0;
    font-size: 13px;
    font-weight: 500;
    line-height: 1.5;
    letter-spacing: 0;
    position: relative;
    z-index: 1;
}

.mbg-ps-brand {
    color: #0f67cf;
    font-weight: 800;
}

.mbg-ps-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    min-height: 38px;
    padding: 9px 18px;
    border-radius: 999px;
    background: linear-gradient(180deg, #1a73e8 0%, #0f67cf 100%);
    color: #ffffff !important;
    font-size: 12px;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: .2px;
    text-decoration: none !important;
    white-space: nowrap;
    transition: opacity .15s ease, transform .15s ease, box-shadow .15s ease;
    box-shadow: 0 5px 14px rgba(26, 115, 232, .24);
    position: relative;
    z-index: 1;
}

.mbg-ps-button:hover,
.mbg-ps-button:focus {
    color: #ffffff !important;
    opacity: .97;
    text-decoration: none !important;
    transform: translateY(-1px);
    box-shadow: 0 8px 16px rgba(26, 115, 232, .28);
}

@media (max-width: 640px) {
    .mbg-preferred-source {
        gap: 10px;
        margin: 15px 0 18px;
        padding: 13px 14px;
        border-radius: 12px;
    }

    .mbg-ps-heading {
        font-size: 12px;
    }

    .mbg-ps-button {
        min-height: 36px;
        padding: 8px 12px;
        font-size: 11px;
    }
}

@media (max-width: 420px) {
    .mbg-preferred-source {
        align-items: stretch;
        flex-direction: column;
    }

    .mbg-ps-button {
        width: 100%;
        box-sizing: border-box;
    }
}

@media (prefers-reduced-motion: reduce) {
    .mbg-preferred-source * {
        transition: none !important;
    }
}

.mbg-ps-admin .mbg-preferred-source {
    margin-top: 0;
    margin-bottom: 0;
}