.imei-container {
    text-align: center;
    background: linear-gradient(135deg, #e3004d, #ff5173);
    color: #fff;
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    max-width: 400px;
    margin: 50px auto;
}
#imei-input {
    width: 80%;
    padding: 10px;
    border-radius: 10px;
    border: none;
    margin-bottom: 10px;
    text-align: center;
}
#imei-submit {
    background: #fff;
    color: #e3004d;
    border: none;
    padding: 10px 20px;
    border-radius: 10px;
    cursor: pointer;
    font-weight: bold;
}
#imei-submit:hover {
    background: #f9f9f9;
}
#imei-popup {
    display: none;
    justify-content: center;
    align-items: center;
    background: rgba(0,0,0,0.6);
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 9999;
}
.popup-content {
    background: #fff;
    color: #000;
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    min-width: 280px;
    position: relative;
    box-shadow: 0 6px 15px rgba(0,0,0,0.3);
}
#popup-close {
    position: absolute;
    right: 15px;
    top: 10px;
    font-size: 24px;
    cursor: pointer;
    color: #e3004d;
}