#stt-button {
    position: fixed;
    bottom: 30px;
    width: var(--stt-size);
    height: var(--stt-size);
    background-color: var(--stt-color);
    color: #fff;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.2s ease;
    z-index: 9999;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    padding: 0;
    line-height: 1;
}

#stt-button.show {
    opacity: 1;
    visibility: visible;
}

#stt-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

#stt-button svg {
    width: var(--stt-arrow-size);
    height: var(--stt-arrow-size);
    display: block;
}

/* Позиция */
body.stt-right #stt-button {
    right: 30px;
    left: auto;
}

body.stt-left #stt-button {
    left: 30px;
    right: auto;
}