.back-to-top {
    position: fixed;
    right: calc(1rem + env(safe-area-inset-right, 0px));
    bottom: calc(1rem + env(safe-area-inset-bottom, 0px));
    z-index: 900;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    min-width: 44px;
    min-height: 44px;
    box-sizing: border-box;
    padding: 0.65rem 0.85rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-primary);
    color: var(--accent-primary);
    box-shadow: 0 2px 10px var(--shadow-color);
    font: inherit;
    font-size: 0.85rem;
    cursor: pointer;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.back-to-top[hidden] {
    display: none;
}

.back-to-top:hover {
    border-color: var(--accent-primary);
}

.back-to-top:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 3px;
}

.back-to-top__icon {
    font-size: 1.2rem;
    line-height: 1;
}