.modal-overlay {
     position: fixed;
     top: 0; left: 0;
     width: 100%; height: 100%;
     background: rgba(0,0,0,0.5);
     display: flex;
     justify-content: center;
     align-items: center;
     z-index: 9999;
 }
.modal-content {
    background: #fff;
    padding: 20px 30px;
    border-radius: 8px;
    min-width: 300px;
    box-shadow: 0 0 20px rgba(0,0,0,0.3);
}
.modal-header {
    display: flex;
    justify-content: space-between;
    font-size: 16px;
    font-weight: bold;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
    margin-bottom: 15px;
}
.close-btn {
    cursor: pointer;
    font-size: 20px;
}
.captcha-row {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}
.captcha-row img {
    border: 1px solid #ddd;
    border-radius: 4px;
    height: 40px;
    margin-right: 10px;
}
.captcha-row a {
    color: #337ab7;
    cursor: pointer;
}
.input-row {
    margin-bottom: 15px;
}
.input-row input {
    width: 100%;
    padding: 8px 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}
.modal-footer {
    text-align: right;
}
.modal-footer .btn {
    padding: 6px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}
.btn-confirm {
    background: #5cb85c;
    color: #fff;
    margin-left: 10px;
}
.btn-cancel {
    background: #ccc;
    color: #333;
}