.si-google-preferred-source-btn,
.si-gps-popup-mainbtn {
    appearance: none;
    -webkit-appearance: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 22px;
    border: 0;
    border-radius: 6px;
    background: #fff;
    color: #111;
    font: inherit;
    font-size: 14px;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: .02em;
    text-decoration: none !important;
    cursor: pointer;
    box-sizing: border-box;
    transition: transform .18s ease, opacity .18s ease, background .18s ease;
}

.si-google-preferred-source-btn:hover,
.si-google-preferred-source-btn:focus,
.si-gps-popup-mainbtn:hover,
.si-gps-popup-mainbtn:focus {
    color: #111;
    background: #f1f1f1;
    opacity: 1;
    transform: translateY(-1px);
}

.si-gps-popup-overlay {
    display: flex;
    position: fixed;
    inset: 0;
    z-index: 9999999;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    padding: 24px;
    background: rgba(0,0,0,.64);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity .35s ease, visibility .35s ease;
}

.si-gps-popup-overlay.si-gps-is-visible {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.si-gps-popup {
    position: relative;
    width: min(720px, 100%);
    min-height: 370px;
    overflow: hidden;
    border: 1px solid rgba(255,255,255,.16);
    border-radius: 14px;
    background-color: #111;
    background-image:
        linear-gradient(90deg, rgba(0,0,0,.78), rgba(0,0,0,.54)),
        url('https://www.stereoindex.com/wp-content/uploads/2026/08/bannerwin.webp');
    background-position: center;
    background-size: cover;
    box-shadow: 0 24px 80px rgba(0,0,0,.45);
    transform: translateY(18px) scale(.985);
    transition: transform .35s ease;
}

.si-gps-is-visible .si-gps-popup {
    transform: translateY(0) scale(1);
}

.si-gps-popup-inner {
    box-sizing: border-box;
    display: flex;
    min-height: 370px;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 48px 56px 36px;
    text-align: center;
    color: #fff;
}

.si-gps-popup h3 {
    margin: 0;
    max-width: 620px;
    color: #fff;
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 800;
    line-height: 1.08;
    letter-spacing: -.025em;
}

.si-gps-popup p {
    max-width: 600px;
    margin: 20px 0 28px;
    color: rgba(255,255,255,.92);
    font-size: 17px;
    line-height: 1.55;
}

.si-gps-popup-mainbtn,
.si-gps-popup button.si-gps-popup-mainbtn {
    min-width: 280px;
    min-height: 56px;
    padding: 16px 28px;
    border: 1px solid #4285f4 !important;
    border-radius: 9px;
    background: #1a73e8 !important;
    color: #fff !important;
    box-shadow: 0 8px 24px rgba(26,115,232,.32);
    font-size: 14px;
    font-weight: 850;
    letter-spacing: .035em;
    text-shadow: none !important;
    opacity: 1 !important;
}

.si-gps-popup-mainbtn:hover,
.si-gps-popup-mainbtn:focus,
.si-gps-popup button.si-gps-popup-mainbtn:hover,
.si-gps-popup button.si-gps-popup-mainbtn:focus {
    border-color: #5a95f5 !important;
    background: #155fc0 !important;
    color: #fff !important;
    box-shadow: 0 10px 30px rgba(26,115,232,.42);
    opacity: 1 !important;
    transform: translateY(-2px);
}

.si-gps-popup-mainbtn:active,
.si-gps-popup button.si-gps-popup-mainbtn:active {
    background: #1458ad !important;
    color: #fff !important;
    transform: translateY(0);
}

.si-gps-popup-later {
    appearance: none;
    -webkit-appearance: none;
    margin-top: 20px;
    padding: 8px 14px;
    border: 0;
    background: transparent;
    color: #fff;
    font: inherit;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    opacity: .92;
}

.si-gps-popup-later:hover,
.si-gps-popup-later:focus {
    color: #fff;
    opacity: 1;
    text-decoration: underline;
}

body.si-gps-popup-active {
    overflow: hidden;
}

@media (max-width: 640px) {
    .si-gps-popup-overlay {
        padding: 14px;
    }

    .si-gps-popup {
        min-height: 390px;
        border-radius: 12px;
    }

    .si-gps-popup-inner {
        min-height: 390px;
        padding: 40px 24px 28px;
    }

    .si-gps-popup h3 {
        font-size: 30px;
    }

    .si-gps-popup p {
        font-size: 16px;
    }

    .si-gps-popup-mainbtn {
        width: 100%;
        min-width: 0;
    }
}

.si-gps-popup a.si-gps-popup-mainbtn,
a.si-google-preferred-source-btn {
    text-decoration: none !important;
}