body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    /* Transition fluide pour les changements de thème */
    transition: background-color 0.3s ease, color 0.3s ease;
}

main {
    flex: 1;
}

.footer {
    margin-top: auto;
}

.card {
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    /* Transition fluide pour les changements de thème */
    transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.navbar {
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    /* Transition fluide pour les changements de thème */
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.btn-primary {
    background-color: #0d6efd;
    border-color: #0d6efd;
}

.btn-primary:hover {
    background-color: #0b5ed7;
    border-color: #0a58ca;
}

.certificate-card {
    transition: transform 0.2s;
}

.certificate-card:hover {
    transform: translateY(-5px);
}

.alert {
    margin-bottom: 1rem;
}

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

@media (max-width: 768px) {
    .container {
        padding-left: 15px;
        padding-right: 15px;
    }
}

/* Transitions fluides pour les changements de thème sur les éléments principaux */
.alert, .btn, .form-control, .form-select, .modal-content, .dropdown-menu {
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}