.captcha-btn {
    width: 100%;
    padding: 10px 20px;
    background-color: #189F92;
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
}
.captcha-btn:hover {
    background-color: #158a7e;
}
.captcha-btn.verified {
    background-color: #4caf50;
    cursor: default;
}
.captcha-modal {
    position: fixed;
    z-index: 10000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
}
.captcha-modal-content {
    background-color: #fff;
    border-radius: 8px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    animation: modalFadeIn 0.3s ease;
}
@keyframes modalFadeIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}
.captcha-modal-header {
    padding: 15px 20px;
    border-bottom: 1px solid #eee;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.captcha-modal-title {
    font-size: 18px;
    font-weight: bold;
    color: #333;
}
.captcha-modal-close {
    font-size: 28px;
    color: #999;
    cursor: pointer;
    line-height: 1;
    transition: color 0.3s ease;
}
.captcha-modal-close:hover {
    color: #333;
}
.captcha-modal-body {
    padding: 20px;
}