.question-footer__tools .footer-btn:disabled {
    cursor: not-allowed;
    opacity: 0.42;
}

.cbt-study-tool-toast {
    position: fixed;
    z-index: 10020;
    left: 50%;
    bottom: 88px;
    max-width: calc(100vw - 32px);
    padding: 12px 18px;
    border-radius: 6px;
    background: #212529;
    color: #fff;
    font-size: 14px;
    opacity: 0;
    pointer-events: none;
    transform: translate(-50%, 12px);
    transition: opacity 0.18s ease, transform 0.18s ease;
}

.cbt-study-tool-toast.is-visible {
    opacity: 1;
    transform: translate(-50%, 0);
}