.success-popup {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.75);
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.success-box {
    background: #111;
    color: white;
    padding: 40px;
    border-radius: 20px;
    text-align: center;
    max-width: 400px;
    width: 90%;
    border: 1px solid #333;
}

.checkmark {
    font-size: 70px;
    color: #4CAF50;
    margin-bottom: 10px;
}

.success-box h3 {
    margin-bottom: 15px;
}

.success-box p {
    color: #ccc;
    margin-bottom: 25px;
}

.success-box button {
    background: white;
    color: black;
    border: none;
    padding: 12px 25px;
    border-radius: 30px;
    cursor: pointer;
}