.scroll-to-top-btn {
    position: fixed;
    bottom: 20px;
    left: 20px;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--nav-bg);
    border: none;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(143, 171, 143, 0.4);
    transition: none;
    z-index: 998;
    color: white;
    font-size: 24px;
    font-weight: 700;
    touch-action: manipulation;
}

.scroll-to-top-btn:active {
    transform: scale(0.95);
    box-shadow: 0 2px 8px rgba(143, 171, 143, 0.3);
}

.scroll-to-top-btn.visible {
    display: flex;
}

@media (min-width: 769px) {
    .scroll-to-top-btn {
        width: 56px;
        height: 56px;
        font-size: 22px;
    }
}