/* Scroll to Top Button - Common */
.scroll-top-btn {
    position: fixed;
    bottom: 38px;
    right: 16px;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--s14-accent, var(--accent-color, #10847e));
    color: #fff;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.25);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s, transform 0.3s;
    transform: translateY(10px);
    z-index: 1050;
}

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

.scroll-top-btn:active {
    transform: scale(0.9);
}

/* Hide when any popup/overlay is open */
body[style*="overflow: hidden"] .scroll-top-btn,
body[style*="overflow:hidden"] .scroll-top-btn {
    opacity: 0 !important;
    visibility: hidden !important;
    pointer-events: none;
}

@media (min-width: 600px) {
    .scroll-top-btn {
        right: calc(50% - 250px + 16px);
    }
}