/* =========================================
   Кнопка "Наверх"
   ========================================= */
.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--color-primary);
    color: var(--color-white);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease, background-color 0.2s;
    z-index: 1000;
}

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

.scroll-top:hover {
    background-color: var(--color-primary-hover, #a00);
    transform: translateY(-3px);
}

.scroll-top:active {
    transform: translateY(0);
}

/* На мобильных — чуть меньше и ближе к краю */
@media (max-width: 576px) {
    .scroll-top {
        width: 44px;
        height: 44px;
        bottom: 20px;
        right: 20px;
    }
}