.scroll-jump-button {
    box-sizing: border-box;
    position: relative;
    display: grid;
    place-items: center;
    flex: none;
    width: 48px;
    height: 48px;
    padding: 0;
    border: 1px solid var(--ds-separator-strong, var(--border-primary));
    border-radius: 50%;
    background: var(--ds-surface-elevated, var(--background-secondary));
    color: var(--ds-text, var(--text-primary));
    box-shadow: 0 2px 8px #0002;
    cursor: pointer;
    transition: background-color .15s ease, transform .15s ease, opacity .15s ease;
}
.scroll-jump-button__icon { display: grid; place-items: center; }
.scroll-jump-button__icon svg path { stroke-width: 1.6; }
.scroll-jump-button--up .scroll-jump-button__chevron { transform: rotate(180deg); }
.scroll-jump-button:active:not(:disabled) { transform: scale(.94); }
.scroll-jump-button:focus-visible { outline: none; background: var(--ds-surface-tint); }
.scroll-jump-button:disabled { opacity: .5; cursor: default; }
@media (prefers-reduced-motion: reduce) { .scroll-jump-button { transition: none; } }