:root {
    --abust-bg: #171a24;
    --abust-icon: #ffffff;
    --abust-progress: #7667ff;
    --abust-track: #343847;
    --abust-radius: 15px;
    --abust-size-desktop: 52px;
    --abust-size-mobile: 46px;
    --abust-side-desktop: 24px;
    --abust-side-mobile: 14px;
    --abust-bottom-desktop: 24px;
    --abust-bottom-mobile: 14px;
    --abust-z: 9999;
}

.abust-button {
    --abust-current-size: var(--abust-size-desktop);
    --abust-current-side: var(--abust-side-desktop);
    --abust-current-bottom: var(--abust-bottom-desktop);
    --abust-smart-lift: 0px;
    --abust-page-progress: 0deg;

    position: fixed;
    z-index: var(--abust-z);
    bottom: calc(var(--abust-current-bottom) + var(--abust-smart-lift));
    width: var(--abust-current-size);
    height: var(--abust-current-size);
    padding: 2px;
    border: 0;
    border-radius: calc(var(--abust-radius) + 2px);
    background: conic-gradient(
        var(--abust-progress) var(--abust-page-progress),
        var(--abust-track) var(--abust-page-progress)
    );
    box-shadow: 0 13px 34px rgba(12, 15, 26, .24), 0 4px 12px rgba(12, 15, 26, .14);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(14px) scale(.94);
    transition:
        opacity .24s ease,
        visibility .24s ease,
        transform .24s ease,
        bottom .22s ease,
        box-shadow .22s ease;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.abust-button--right {
    right: var(--abust-current-side);
}

.abust-button--left {
    left: var(--abust-current-side);
}

.abust-button.is-visible {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0) scale(1);
}

.abust-button.is-forced-hidden {
    opacity: 0 !important;
    visibility: hidden !important;
    pointer-events: none !important;
    transform: translateY(14px) scale(.94) !important;
}

.abust-button:hover {
    transform: translateY(-3px) scale(1);
    box-shadow: 0 17px 40px rgba(12, 15, 26, .28), 0 5px 14px rgba(12, 15, 26, .18);
}

.abust-button:active {
    transform: translateY(0) scale(.97);
}

.abust-button:focus-visible {
    outline: 3px solid color-mix(in srgb, var(--abust-progress) 62%, white);
    outline-offset: 4px;
}

.abust-button__core {
    display: grid;
    place-items: center;
    width: 100%;
    height: 100%;
    border-radius: var(--abust-radius);
    background:
        linear-gradient(180deg, rgba(255, 255, 255, .07), rgba(255, 255, 255, 0)),
        var(--abust-bg);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, .11),
        inset 0 -1px 0 rgba(0, 0, 0, .16);
}

.abust-button svg {
    width: 44%;
    height: 44%;
    fill: none;
    stroke: var(--abust-icon);
    stroke-width: 1.8;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.abust-button::before {
    content: attr(data-tooltip);
    position: absolute;
    top: 50%;
    padding: 7px 10px;
    border-radius: 9px;
    background: rgba(18, 20, 28, .94);
    color: #fff;
    font: 500 12px/1 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-50%);
    transition: opacity .18s ease, transform .18s ease;
    box-shadow: 0 8px 24px rgba(0, 0, 0, .18);
}

.abust-button--right::before {
    right: calc(100% + 10px);
    transform: translate(4px, -50%);
}

.abust-button--left::before {
    left: calc(100% + 10px);
    transform: translate(-4px, -50%);
}

.abust-button:hover::before,
.abust-button:focus-visible::before {
    opacity: 1;
    transform: translate(0, -50%);
}

@media (max-width: 782px) {
    .abust-button {
        --abust-current-size: var(--abust-size-mobile);
        --abust-current-side: var(--abust-side-mobile);
        --abust-current-bottom: var(--abust-bottom-mobile);
    }

    .abust-button::before {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    .abust-button {
        transition: opacity .01ms linear, visibility .01ms linear, bottom .01ms linear;
    }

    .abust-button:hover,
    .abust-button:active,
    .abust-button.is-visible,
    .abust-button.is-forced-hidden {
        transform: none;
    }
}