.sds-scroll-top-button {
    position: fixed;
    right: 22px;
    bottom: 22px;
    width: 46px;
    height: 46px;
    border: 1px solid rgba(191, 219, 254, 0.95);
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.92);
    color: #2563eb;
    box-shadow: 0 18px 38px rgba(15, 23, 42, 0.16);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1200;
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px);
    transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s ease, background 0.22s ease;
    backdrop-filter: blur(12px);
}

    .sds-scroll-top-button.is-visible {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .sds-scroll-top-button:hover {
        background: #eff6ff;
        color: #1d4ed8;
    }

    .sds-scroll-top-button svg {
        width: 22px;
        height: 22px;
        display: block;
    }

.sds-answer-saved {
    box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.14);
    border-radius: 16px;
}

@media (max-width: 768px) {
    .sds-scroll-top-button {
        right: 16px;
        bottom: 16px;
        width: 44px;
        height: 44px;
        border-radius: 15px;
    }
}