.sim-card img { width: 50px; margin-bottom: 10px; }
        .sim-number { font-size: 20px; font-weight: bold; }
        .sim-price { color: #e91e63; font-weight: bold; }
        .sidebar-title { font-weight: bold; margin-top: 20px; }
        .sidebar-link { display: block; margin: 5px 0; color: #007bff; text-decoration: none; }
        .sidebar-link:hover { text-decoration: underline; }
        /* Popup filter đẹp như ảnh */
        .filter-panel {
            min-width: 100px;
            max-width: 200px;
            background: #fff;
            border-radius: 10px;
            box-shadow: 0 4px 24px rgba(0,0,0,0.12);
            padding: 10px 10px;
            z-index: 100;
        }
        .filter-panel.filter-panel-wide {
            min-width: 520px;
            max-width: 800px;
        }
        .filter-panel.filter-panel-wide2 {
            min-width: 320px;
            max-width: 420px;
        }
        .filter-panel.filter-panel-wide3 {
            min-width: 150px;
            max-width: 160px;
        }
        @media (max-width: 600px) {
            .filter-panel,
            .filter-panel.filter-panel-wide {
                min-width: 100vw;
                max-width: 100vw;
                left: 0 !important;
                right: 0 !important;
                border-radius: 0;
            }
        }