/* Modal 弹窗样式（验证码） */
#modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}
#modal .modal-content {
    background: #fff;
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    width: 320px;
}
#modal .modal-content img {
    width: 250px;
    margin-bottom: 15px;
}
#modal .modal-content input {
    width: 100%;
    padding: 8px;
    margin-bottom: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
}
#modal .modal-content button {
    padding: 8px 16px;
    border: none;
    background-color: #007bff;
    color: #fff;
    border-radius: 4px;
    cursor: pointer;
}