@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
    }

    .playtrade-logo {
        margin-bottom: 1rem;
    }

    .search-bar {
        width: 100%;
        margin-bottom: 1rem;
    }

    .user-actions {
        width: 100%;
        display: flex;
        justify-content: space-between;
    }

    .user-actions a {
        margin: 0;
    }

    .categories {
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: 0.5rem;
        -webkit-overflow-scrolling: touch;
    }

    .category {
        white-space: nowrap;
        margin: 0 0.5rem 0 0;
    }

    .filters {
        flex-direction: column;
    }

    .filter-group {
        margin-bottom: 0.5rem;
    }

    .ad-card {
        min-height: 340px;
    }
}