.invitation-card {
    border: none;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    margin-bottom: 1rem;
}

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

.role-badge {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 0.375rem;
    font-weight: 500;
}

.role-admin {
    background: #fd7e14;
    color: white;
}

.role-member {
    background: #6c757d;
    color: white;
}

.expired-card {
    opacity: 0.6;
    border-left: 4px solid #dc3545;
}

.btn-accept {
    background: linear-gradient(135deg, #28a745, #20c997);
    border: none;
    color: white;
}

.btn-accept:hover {
    background: linear-gradient(135deg, #218838, #1ea080);
    color: white;
}