body, html {
    height: 100%;
}
.center-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
}
.login-form {
    max-width: 400px;
    width: 100%;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 10px;
    background-color: #f9f9f9;
}

/* Shake Effect */

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.modal-shake {
    animation: shake 0.3s ease-in-out;
}

/* Ensure error container is visible */

.alert-danger {
    display: block !important; /* Override d-none when shown */
}

/* Smooth transitions for a polished feel */

.is-invalid {
    border-color: #dc3545;
    transition: border-color 0.15s ease-in-out;
}

.invalid-feedback {
    opacity: 1;
    transition: opacity 0.3s ease-in-out;
}

.is-invalid:focus {
    border-color: #dc3545;
    box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25);
}

/* Smooth disappearance */
.invalid-feedback.hiding {
    opacity: 0;
}

/* Table row select feature */

.table tr {
    cursor: pointer;
}
.table tr.selected {
    background-color: #e3f2fd !important;
}

#loadingIndicator {
    transition: opacity 0.3s ease;
}

.pagination {
    margin-top: 20px;
}

.page-item.active .page-link {
    background-color: #0d6efd;
    border-color: #0d6efd;
}