.stt-btn-753e6a65 {
    position: fixed;
    bottom: 30px;
    width: var(--stt-size-753e6a65);
    height: var(--stt-size-753e6a65);
    background-color: var(--stt-bg-753e6a65);
    color: var(--stt-color-753e6a65);
    border: none;
    cursor: pointer;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    transition: all 0.3s ease;
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
}

.stt-btn-753e6a65.stt-visible {
    opacity: 1;
    pointer-events: auto;
    visibility: visible;
}

.stt-btn-753e6a65 svg {
    width: 50%;
    height: 50%;
}

.stt-btn-753e6a65:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.2);
}

/* Positions */
.stt-pos-bottom-right {
    right: 30px;
}
.stt-pos-bottom-left {
    left: 30px;
}

/* Shapes */
.stt-shape-circle {
    border-radius: 50%;
}
.stt-shape-square {
    border-radius: 0;
}
.stt-shape-rounded {
    border-radius: 8px;
}

/* Animations */
.stt-anim-fade.stt-visible {
    /* Opacity handled in base class */
}
.stt-anim-slide {
    transform: translateY(50px);
}
.stt-anim-slide.stt-visible {
    transform: translateY(0);
}
.stt-anim-slide.stt-visible:hover {
    transform: translateY(-3px);
}

/* Mobile */
@media (max-width: 768px) {
    .stt-btn-753e6a65.stt-hide-mobile {
        display: none !important;
    }
}