```css
/* =========================================
   PRODUCTS PAGE - FULLY RESPONSIVE
   Mobile → Tablet → Desktop → Large LED
========================================= */

.products-layout {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;

    display: flex;
    align-items: flex-start;

    gap: 30px;

    padding-bottom: 50px;

    box-sizing: border-box;
}


/* =========================================
   SIDEBAR
========================================= */

.sidebar {
    width: 220px;
    flex: 0 0 220px;

    background: #fff;
    border: 1px solid var(--border);
    border-radius: 10px;

    padding: 18px;

    box-sizing: border-box;
}

.sidebar h3 {
    color: var(--green-dark);
    margin: 0 0 12px;
    font-size: 16px;
}

.filter-list {
    margin: 0;
    padding: 0;
    list-style: none;
}

.filter-list li {
    margin-bottom: 4px;
}

.filter-list a {
    display: block;

    padding: 8px 10px;

    border-radius: 6px;

    font-size: 14px;
    color: var(--text-dark);

    text-decoration: none;

    transition: 0.2s ease;

    overflow-wrap: anywhere;
}

.filter-list a:hover,
.filter-list a.active {
    background: var(--green-light);
    color: var(--green-dark);
    font-weight: 600;
}


/* =========================================
   PRODUCTS MAIN
========================================= */

.products-main {
    flex: 1 1 auto;
    min-width: 0;
}


/* =========================================
   TOOLBAR
========================================= */

.products-toolbar {
    width: 100%;

    display: flex;
    justify-content: space-between;
    align-items: center;

    gap: 15px;

    margin-bottom: 20px;

    font-size: 14px;
    color: var(--text-muted);

    box-sizing: border-box;
}

.sort-form {
    flex-shrink: 0;
}

.sort-form select {
    max-width: 100%;

    padding: 7px 10px;

    border-radius: 6px;
    border: 1px solid var(--border);

    margin-left: 6px;

    background: #fff;

    font-size: 14px;
}


/* =========================================
   PRODUCT GRID
========================================= */

.product-grid {
    width: 100%;

    display: grid;

    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));

    gap: 20px;

    box-sizing: border-box;
}


/* =========================================
   NO RESULTS
========================================= */

.no-results {
    color: var(--text-muted);
    padding: 30px 0;
}


/* =========================================
   LARGE LED / 4K
========================================= */

@media (min-width: 1600px) {

    .products-layout {
        max-width: 1500px;
        gap: 40px;
    }

    .sidebar {
        width: 250px;
        flex-basis: 250px;
        padding: 22px;
    }

    .product-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        gap: 24px;
    }

    .products-toolbar {
        font-size: 15px;
    }
}


/* =========================================
   DESKTOP / LAPTOP
   769px - 1199px
========================================= */

@media (min-width: 769px) and (max-width: 1199px) {

    .products-layout {
        gap: 20px;
    }

    .sidebar {
        width: 200px;
        flex-basis: 200px;
        padding: 15px;
    }

    .product-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 16px;
    }
}


/* =========================================
   TABLET
   481px - 768px
========================================= */

@media (min-width: 481px) and (max-width: 768px) {

    .products-layout {
        flex-direction: column;

        gap: 20px;

        padding-bottom: 35px;
    }

    /* Full-width sidebar */
    .sidebar {
        width: 100%;
        flex: none;

        padding: 15px;
    }

    .sidebar h3 {
        font-size: 15px;
    }

    /*
       Category/filter links become
       horizontal where possible
    */
    .filter-list {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 5px;
    }

    .filter-list li {
        margin-bottom: 0;
    }

    .products-main {
        width: 100%;
    }

    .products-toolbar {
        width: 100%;
    }

    /* 2 products per row */
    .product-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 14px;
    }
}


/* =========================================
   MOBILE
   Up to 480px
========================================= */

@media (max-width: 480px) {

    .products-layout {
        width: 100%;

        flex-direction: column;

        gap: 15px;

        padding-bottom: 30px;
    }


    /* =====================================
       MOBILE SIDEBAR
    ===================================== */

    .sidebar {
        width: 100%;
        flex: none;

        padding: 12px;

        border-radius: 8px;
    }

    .sidebar h3 {
        font-size: 15px;
        margin-bottom: 10px;
    }

    /*
       2 filter columns on mobile
    */
    .filter-list {
        display: grid;

        grid-template-columns: repeat(2, minmax(0, 1fr));

        gap: 4px 6px;
    }

    .filter-list li {
        margin-bottom: 0;
        min-width: 0;
    }

    .filter-list a {
        padding: 8px 7px;

        font-size: 12px;

        text-align: center;

        white-space: normal;
    }


    /* =====================================
       PRODUCTS MAIN
    ===================================== */

    .products-main {
        width: 100%;
        min-width: 0;
    }


    /* =====================================
       TOOLBAR
    ===================================== */

    .products-toolbar {
        width: 100%;

        display: flex;

        justify-content: space-between;
        align-items: center;

        gap: 8px;

        margin-bottom: 14px;

        font-size: 12px;
    }

    .sort-form {
        min-width: 0;
    }

    .sort-form label {
        font-size: 12px;
    }

    .sort-form select {
        width: auto;
        max-width: 130px;

        padding: 6px 7px;

        font-size: 12px;

        margin-left: 3px;
    }


    /* =====================================
       PRODUCT GRID
       EXACTLY 2 PRODUCTS ON MOBILE
    ===================================== */

    .product-grid {
        width: 100%;

        display: grid;

        grid-template-columns: repeat(2, minmax(0, 1fr));

        gap: 10px;
    }
}


/* =========================================
   VERY SMALL PHONES
   Up to 360px
========================================= */

@media (max-width: 360px) {

    .products-layout {
        gap: 12px;
    }

    .sidebar {
        padding: 10px;
    }

    .filter-list {
        gap: 3px 5px;
    }

    .filter-list a {
        padding: 7px 4px;
        font-size: 11px;
    }

    .products-toolbar {
        font-size: 11px;
    }

    .sort-form label {
        font-size: 11px;
    }

    .sort-form select {
        max-width: 110px;
        padding: 5px;
        font-size: 11px;
    }

    /* Still 2 products */
    .product-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 8px;
    }
}


/* =========================================
   PREVENT HORIZONTAL OVERFLOW
========================================= */

.products-layout,
.products-layout *,
.products-main,
.product-grid {
    box-sizing: border-box;
}

.products-layout img {
    max-width: 100%;
}
```