.scroll-top {
    position: fixed;
    right: 24px;
    bottom: 24px;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    border: none;
    background: #f07a1f;
    color: #fff;
    font-size: 20px;
    font-weight: 700;
    box-shadow: 0 14px 28px rgba(240, 122, 31, 0.35);
    cursor: pointer;
    opacity: 0;
    pointer-events: none;
    transform: translateY(8px);
    transition: opacity 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
    z-index: 999;
}

.scroll-top.is-visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.scroll-top:hover {
    background: #d85a12;
    box-shadow: 0 18px 34px rgba(216, 90, 18, 0.35);
}

.scroll-top-icon {
    display: inline-block;
    line-height: 1;
}

@media (max-width: 640px) {
    .scroll-top {
        right: 16px;
        bottom: 16px;
        width: 46px;
        height: 46px;
        font-size: 18px;
    }
}