.page-scroll-control {
    --scroll-control-color: #ff5726;
    position: fixed;
    z-index: 80;
    right: max(20px, env(safe-area-inset-right));
    top: 60%;
    bottom: auto;
    width: 52px;
    height: 52px;
    display: grid;
    place-items: center;
    padding: 0;
    border: 0;
    border-radius: 50%;
    color: #fff;
    background: var(--scroll-control-color);
    box-shadow: 0 12px 30px rgba(255, 87, 38, .3);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px) scale(.92);
    transition: opacity .22s ease, transform .22s ease, visibility .22s;
}

.page-scroll-control.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.page-scroll-control::before,
.page-scroll-control::after {
    position: absolute;
    inset: -1px;
    z-index: -1;
    content: "";
    border: 2px solid rgba(255, 87, 38, .48);
    border-radius: inherit;
    animation: scroll-control-wave 2.2s ease-out infinite;
    pointer-events: none;
}

.page-scroll-control::after {
    animation-delay: 1.1s;
}

.page-scroll-control__arrow {
    width: 13px;
    height: 13px;
    border-right: 3px solid currentColor;
    border-bottom: 3px solid currentColor;
    transform: translateY(-3px) rotate(45deg);
    transition: transform .22s ease;
}

.page-scroll-control.is-up .page-scroll-control__arrow {
    transform: translateY(3px) rotate(225deg);
}

.page-scroll-control:hover {
    background: #dc4310;
    transform: translateY(-2px) scale(1.03);
}

.page-scroll-control:focus-visible {
    outline: 4px solid rgba(255, 87, 38, .24);
    outline-offset: 4px;
}

@keyframes scroll-control-wave {
    0% { opacity: .7; transform: scale(.92); }
    75%, 100% { opacity: 0; transform: scale(1.55); }
}

@media (max-width: 680px) {
    .page-scroll-control {
        right: max(14px, env(safe-area-inset-right));
        top: 62%;
        bottom: auto;
        width: 50px;
        height: 50px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .page-scroll-control,
    .page-scroll-control__arrow {
        transition: none;
    }
    .page-scroll-control::before,
    .page-scroll-control::after {
        animation: none;
        display: none;
    }
}