.stt-popup {
    position: fixed;
    inset: 0;
    display: none;
    z-index: 99999;
}

.stt-popup.is-visible {
    display: block;
}

.stt-popup__overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
}

.stt-popup__dialog {
    position: relative;
    z-index: 2;
    width: min(92vw, 520px);
    margin: 10vh auto 0;
    background: #fff;
    border-radius: 14px;
    padding: 28px;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.2);
}

.stt-popup__dialog h2 {
    margin-top: 0;
    margin-bottom: 10px;
}

.stt-popup__close {
    position: absolute;
    top: 10px;
    right: 10px;
    border: 0;
    background: transparent;
    font-size: 28px;
    line-height: 1;
    cursor: pointer;
}

.stt-popup__button {
    display: inline-block;
    padding: 12px 16px;
    background: #2c5c88;
    color: #fff;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
}