.card-header.bg-gradient-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
}

#refreshCaptcha {
    transition: background-color 0.2s ease;
}
#refreshCaptcha:hover {
    background-color: #f8f9fa !important;
}
#refreshCaptcha:hover .captcha-icon-hover {
    transform: rotate(180deg);
}
#refreshCaptcha:active .captcha-icon-hover {
    transform: rotate(180deg) scale(0.85);
}
#refreshCaptcha img {
    transition: transform 0.2s ease;
}
#refreshCaptcha:active img {
    transform: scale(0.95);
}

.form-control:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

.alert {
    border: none;
    border-radius: 10px;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.spinner-border {
    width: 1rem;
    height: 1rem;
}