/* Custom styles for Mailbox Number Management */
body {
    background-color: #f8f9fa;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

.container {
    padding-top: 2rem;
}

.display-5 {
    font-weight: 600;
    color: #333;
}

.lead {
    font-size: 1.1rem;
    color: #6c757d;
}

.card {
    border-radius: 12px;
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15) !important;
}

.card-title {
    color: #495057;
    font-weight: 600;
}

.form-label {
    font-weight: 500;
    color: #495057;
    margin-bottom: 0.5rem;
}

.form-control {
    border-radius: 8px;
    border: 1px solid #ced4da;
    padding: 0.75rem;
    transition: all 0.2s ease;
}

.form-control:focus {
    border-color: #0d6efd;
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

.btn-primary {
    background-color: #0d6efd;
    border-color: #0d6efd;
    border-radius: 8px;
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn-primary:hover {
    background-color: #0b5ed7;
    border-color: #0a58ca;
    transform: translateY(-1px);
}

.btn-primary:active {
    transform: translateY(0);
}

.alert {
    border-radius: 8px;
    border: none;
    font-weight: 500;
}

.alert-warning {
    background-color: #fff3cd;
    color: #664d03;
    border-left: 4px solid #f0ad4e;
}

.alert-success {
    background-color: #d1edff;
    color: #0c5460;
    border-left: 4px solid #28a745;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
    border-left: 4px solid #dc3545;
}

/* Loading animation */
.btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

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

/* Responsive adjustments */
@media (max-width: 768px) {
    .container {
        padding-top: 1rem;
    }
    
    .display-5 {
        font-size: 2rem;
    }
    
    .card-body {
        padding: 1.5rem !important;
    }
}

/* Form validation styles */
.was-validated .form-control:invalid,
.form-control.is-invalid {
    border-color: #dc3545;
}

.was-validated .form-control:valid,
.form-control.is-valid {
    border-color: #28a745;
}

.invalid-feedback {
    display: none;
    width: 100%;
    margin-top: 0.25rem;
    font-size: 0.875rem;
    color: #dc3545;
}

.was-validated .form-control:invalid ~ .invalid-feedback,
.form-control.is-invalid ~ .invalid-feedback {
    display: block;
}