body {
    background-color: #f8f9fa;
    min-height: 100vh;
}

.card {
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    border: 1px solid rgba(0, 0, 0, 0.125);
}

.card-header {
    background-color: #f8f9fa;
    border-bottom: 1px solid rgba(0, 0, 0, 0.125);
}

.form-label {
    font-weight: 500;
}

.text-danger {
    color: #dc3545 !important;
}

.table-responsive {
    background-color: white;
    border-radius: 0.375rem;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
}

.table th {
    background-color: #f8f9fa;
    font-weight: 600;
    border-bottom: 2px solid #dee2e6;
}

.navbar-brand {
    font-weight: 600;
}

.btn-sm {
    margin-right: 0.25rem;
}

#message {
    margin-bottom: 1rem;
}

.modal-header {
    border-bottom: 1px solid #dee2e6;
}

.modal-footer {
    border-top: 1px solid #dee2e6;
}

.captcha-question {
    user-select: none;
    font-size: 1.1em;
    font-weight: bold;
    min-width: 120px;
    justify-content: center;
}

#refresh_captcha {
    cursor: pointer;
}

#refresh_captcha:hover {
    background-color: #e9ecef;
}