.stt-0043659c-btn {
    position: fixed;
    bottom: 30px;
    width: var(--stt-size, 45px);
    height: var(--stt-size, 45px);
    background-color: var(--stt-bg, #39b54a);
    color: var(--stt-color, #ffffff);
    border: none;
    outline: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 99999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease, background-color 0.3s ease;
}

.stt-0043659c-btn svg {
    width: calc(var(--stt-size) * 0.5);
    height: calc(var(--stt-size) * 0.5);
    transition: transform 0.3s ease;
}

.stt-0043659c-btn:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.stt-0043659c-btn:hover svg {
    transform: translateY(-2px);
}

/* Positions */
.stt-0043659c-pos-right {
    right: 30px;
}

.stt-0043659c-pos-left {
    left: 30px;
}

/* Shapes */
.stt-0043659c-circle {
    border-radius: 50%;
}

.stt-0043659c-rounded {
    border-radius: 8px;
}

.stt-0043659c-square {
    border-radius: 0;
}

/* Animations */
.stt-0043659c-anim-fade.stt-0043659c-visible {
    opacity: 1;
    pointer-events: auto;
}

.stt-0043659c-anim-slide {
    transform: translateY(100px);
}

.stt-0043659c-anim-slide.stt-0043659c-visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.stt-0043659c-anim-slide.stt-0043659c-visible:hover {
    transform: translateY(-4px);
}

/* Responsive */
@media screen and (max-width: 768px) {
    .stt-0043659c-hide-mobile {
        display: none !important;
    }
}

/* Offset for WordPress Admin Bar */
body.admin-bar .stt-0043659c-btn {
    /* If bottom layout, usually no clash with admin bar at top. Keeping standard */
}