@media screen and (max-width: 768px) {
    .auction-grid {
        grid-template-columns: 1fr; /* Passage sur 1 seule colonne en mobile */
    }

    .bids-sidebar {
        order: 2; /* L'historique passe sous le formulaire sur mobile */
    }

    .auction-main-content {
        order: 1;
    }

    .podium {
        flex-direction: column;
        height: auto;
        align-items: stretch;
    }

    .podium-step {
        max-width: 100%;
        height: auto !important;
        margin-bottom: 0.5rem;
    }

    .hamburger {
        display: block;
        cursor: pointer;
    }

    .hamburger .bar {
        display: block;
        width: 25px;
        height: 3px;
        margin: 5px auto;
        background-color: white;
    }

    .nav-menu {
        display: none;
        width: 100%;
    }

    .nav-menu.active {
        display: block;
    }

    .nav-menu ul {
        flex-direction: column;
        gap: 1rem;
        padding-top: 1rem;
    }
}