@media (max-width: 768px) {
    .header {
        height: 56px;
        padding: 0 16px;
    }

    .header-user {
        margin-left: auto;
        gap: 8px;
        font-size: 13px;
    }

    .header-user .btn-sm {
        padding: 4px 10px;
        font-size: 12px;
    }

    .header-nav {
        display: none;
        position: fixed;
        top: 56px;
        left: 0;
        right: 0;
        background: var(--dark);
        flex-direction: column;
        padding: 12px;
        box-shadow: var(--shadow-lg);
        z-index: 99;
    }

    .header-nav.open { display: flex; }

    .header-nav a {
        padding: 12px 16px;
        width: 100%;
        border-radius: var(--radius-sm);
    }

    .mobile-menu-btn { display: block; }

    .container { padding: 0 16px; }

    .stat-cards {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .stat-card { padding: 14px; }
    .stat-card .value { font-size: 22px; }

    .product-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .product-card .product-info { padding: 10px; }
    .product-card .product-name { font-size: 13px; }
    .product-card .product-price { font-size: 16px; }

    .filter-bar {
        flex-direction: column;
        gap: 8px;
    }

    .filter-bar .form-group { min-width: 100%; }

    table { font-size: 13px; }
    table th, table td { padding: 8px 10px; }

    .card-body { padding: 14px; }
    .card-header { padding: 12px 14px; font-size: 15px; }

    .btn { padding: 10px 16px; }
    .btn-sm { padding: 8px 12px; }

    .modal { max-width: 100%; margin: 10px; border-radius: var(--radius-md); }

    .pagination a, .pagination span {
        min-width: 32px;
        height: 32px;
        font-size: 13px;
    }

    .tabs a { padding: 8px 12px; font-size: 13px; }

    .form-row { flex-direction: column; gap: 0; }
}

@media (max-width: 480px) {
    .stat-cards { grid-template-columns: 1fr 1fr; }
    .product-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
    .product-card .product-price { font-size: 15px; }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .product-grid { grid-template-columns: repeat(3, 1fr); }
    .stat-cards { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1025px) {
    .product-grid { grid-template-columns: repeat(4, 1fr); }
}