.form-container {
    max-width: 1200px;
    margin: 2rem auto;
}

.registration-card {
    border: none;
    border-radius: 10px;
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}

.error-feedback {
    color: #dc3545;
    font-size: 0.875em;
    margin-top: 0.25rem;
    display: none;
}

.form-control.is-invalid ~ .error-feedback {
    display: block;
}

.hidden {
    display: none;
}

#loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.child-info {
    border: 1px solid #dee2e6;
    padding: 15px;
    margin-bottom: 15px;
    border-radius: 5px;
}

.children-selector {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin: 1rem 0;
}

.children-selector .btn {
    min-width: 100px;
    position: relative;
    padding: 1.0rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.children-selector .btn i {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.children-selector .btn-check:checked + .btn {
    color: #fff;
    background-color: #0d6efd;
    border-color: #0d6efd;
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

.children-selector .btn-check:checked + .btn::after {
    content: '✓';
    position: absolute;
    top: -5px;
    right: -5px;
    background: #198754;
    color: white;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
}

.children-selector .btn:hover {
    transform: translateY(-2px);
    transition: transform 0.2s;
}

.floating-alert {
    position: fixed;
    top: 20px;
    right: 10px;
    left: 10px;
    z-index: 1050;
    min-width: 300px;
}