.jost-scroll-top-btn {
    --jstb-size: 54px;
    --jstb-mobile-size: 40px;
    --jstb-icon-size: 22px;
    --jstb-mobile-icon-size: 16px;
    --jstb-offset-x: 28px;
    --jstb-offset-y: 28px;
    --jstb-mobile-offset-x: 14px;
    --jstb-mobile-offset-y: 14px;
    --jstb-radius: 18px;
    --jstb-z: 99999;
    --jstb-bg: #111827;
    --jstb-color: #fff;
    --jstb-hover-bg: #2563eb;
    --jstb-hover-color: #fff;
    --jstb-border: rgba(255, 255, 255, .18);

    position: fixed;
    z-index: var(--jstb-z);
    width: var(--jstb-size);
    height: var(--jstb-size);
    min-width: var(--jstb-size);
    min-height: var(--jstb-size);
    padding: 0;
    margin: 0;
    border: 1px solid var(--jstb-border) !important;
    border-radius: var(--jstb-radius) !important;
    background: var(--jstb-bg) !important;
    background-color: var(--jstb-bg) !important;
    color: var(--jstb-color) !important;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translate3d(0, 12px, 0) scale(.92);
    pointer-events: none;
    box-shadow: 0 18px 45px rgba(15, 23, 42, .24), 0 6px 18px rgba(15, 23, 42, .14);
    backdrop-filter: saturate(170%) blur(10px);
    -webkit-backdrop-filter: saturate(170%) blur(10px);
    transition: opacity .28s ease, visibility .28s ease, transform .28s ease, background .22s ease, background-color .22s ease, color .22s ease, border-color .22s ease, box-shadow .22s ease;
    appearance: none;
    -webkit-appearance: none;
    outline: none;
    line-height: 1;
    text-decoration: none;
    box-sizing: border-box;
}

.jost-scroll-top-btn.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translate3d(0, 0, 0) scale(1);
    pointer-events: auto;
}

.jost-scroll-top-btn:hover,
.jost-scroll-top-btn:focus-visible {
    background: var(--jstb-hover-bg) !important;
    background-color: var(--jstb-hover-bg) !important;
    color: var(--jstb-hover-color) !important;
    transform: translate3d(0, -3px, 0) scale(1.03);
    box-shadow: 0 22px 55px rgba(15, 23, 42, .28), 0 8px 22px rgba(15, 23, 42, .16);
}

.jost-scroll-top-btn:focus-visible {
    outline: 3px solid rgba(37, 99, 235, .25);
    outline-offset: 4px;
}

.jost-scroll-top-icon,
.jost-scroll-top-icon i,
.jost-scroll-top-icon svg {
    width: var(--jstb-icon-size);
    height: var(--jstb-icon-size);
    font-size: var(--jstb-icon-size);
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: inherit !important;
    fill: currentColor !important;
    stroke: currentColor !important;
}

.jost-scroll-top-icon svg {
    max-width: 100%;
    max-height: 100%;
}

.jost-scroll-top-btn .jost-scroll-top-icon i:before,
.jost-scroll-top-btn .jost-scroll-top-icon svg *,
.jost-scroll-top-btn:hover .jost-scroll-top-icon,
.jost-scroll-top-btn:hover .jost-scroll-top-icon i,
.jost-scroll-top-btn:hover .jost-scroll-top-icon i:before,
.jost-scroll-top-btn:hover .jost-scroll-top-icon svg,
.jost-scroll-top-btn:hover .jost-scroll-top-icon svg *,
.jost-scroll-top-btn:focus-visible .jost-scroll-top-icon,
.jost-scroll-top-btn:focus-visible .jost-scroll-top-icon i,
.jost-scroll-top-btn:focus-visible .jost-scroll-top-icon i:before,
.jost-scroll-top-btn:focus-visible .jost-scroll-top-icon svg,
.jost-scroll-top-btn:focus-visible .jost-scroll-top-icon svg * {
    color: inherit !important;
    fill: currentColor !important;
    stroke: currentColor !important;
}

.jstb-pos-bottom-right { right: var(--jstb-offset-x); bottom: var(--jstb-offset-y); }
.jstb-pos-bottom-left { left: var(--jstb-offset-x); bottom: var(--jstb-offset-y); }
.jstb-pos-top-right { right: var(--jstb-offset-x); top: var(--jstb-offset-y); }
.jstb-pos-top-left { left: var(--jstb-offset-x); top: var(--jstb-offset-y); }
.jstb-pos-middle-right { right: var(--jstb-offset-x); top: 50%; transform: translate3d(0, calc(-50% + 12px), 0) scale(.92); }
.jstb-pos-middle-left { left: var(--jstb-offset-x); top: 50%; transform: translate3d(0, calc(-50% + 12px), 0) scale(.92); }
.jstb-pos-middle-right.is-visible,
.jstb-pos-middle-left.is-visible { transform: translate3d(0, -50%, 0) scale(1); }
.jstb-pos-middle-right:hover,
.jstb-pos-middle-right:focus-visible,
.jstb-pos-middle-left:hover,
.jstb-pos-middle-left:focus-visible { transform: translate3d(0, calc(-50% - 3px), 0) scale(1.03); }

.jstb-shape-circle {
    --jstb-radius: 999px !important;
    border-radius: 999px !important;
}

.jstb-shape-square {
    border-radius: var(--jstb-radius) !important;
}

.jstb-no-shadow { box-shadow: none !important; }
.jstb-no-blur { backdrop-filter: none !important; -webkit-backdrop-filter: none !important; }

@media (max-width: 767px) {
    .jost-scroll-top-btn {
        width: var(--jstb-mobile-size);
        height: var(--jstb-mobile-size);
        min-width: var(--jstb-mobile-size);
        min-height: var(--jstb-mobile-size);
        max-width: 18vw;
        max-height: 18vw;
        border-radius: var(--jstb-radius) !important;
        box-shadow: 0 12px 30px rgba(15, 23, 42, .20), 0 4px 12px rgba(15, 23, 42, .12);
    }
    .jost-scroll-top-btn:hover,
    .jost-scroll-top-btn:focus-visible {
        transform: translate3d(0, -2px, 0) scale(1.01);
    }
    .jost-scroll-top-icon,
    .jost-scroll-top-icon i,
    .jost-scroll-top-icon svg {
        width: var(--jstb-mobile-icon-size);
        height: var(--jstb-mobile-icon-size);
        font-size: var(--jstb-mobile-icon-size);
    }
    .jstb-pos-bottom-right { right: var(--jstb-mobile-offset-x); bottom: var(--jstb-mobile-offset-y); }
    .jstb-pos-bottom-left { left: var(--jstb-mobile-offset-x); bottom: var(--jstb-mobile-offset-y); }
    .jstb-pos-top-right { right: var(--jstb-mobile-offset-x); top: var(--jstb-mobile-offset-y); }
    .jstb-pos-top-left { left: var(--jstb-mobile-offset-x); top: var(--jstb-mobile-offset-y); }
    .jstb-pos-middle-right { right: var(--jstb-mobile-offset-x); }
    .jstb-pos-middle-left { left: var(--jstb-mobile-offset-x); }
}

@media (prefers-reduced-motion: reduce) {
    .jost-scroll-top-btn {
        transition: opacity .15s ease, visibility .15s ease;
    }
}