.popup {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.4);
    z-index: 1000;
}

.popup.show { display: flex; justify-content: center; align-items: center; }

.popup-content {
    background: white;
    padding: 30px;
    width: 500px;
    max-height: 80vh;
    overflow-y: auto;
    border-radius: 8px;
    box-shadow: 0 0 20px rgba(0,0,0,0.2);
}

.popup-scroll {
    max-height: 300px;
    overflow-y: scroll;
    margin: 10px 0;
}

.popup-content button {
    margin-right: 10px;
    padding: 10px 20px;
    background: #007bff;
    border: none;
    color: white;
    cursor: pointer;
}