.form-range {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    background: #ddd;
    border-radius: 5px;
    outline: none;
    transition: background 0.3s;
}

.form-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: #000000;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid #fff;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.2);
}

.form-range::-moz-range-thumb,
.form-range::-ms-thumb {
    width: 20px;
    height: 20px;
    background: #cd0000;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid #fff;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.2);
}

.config-size-list {
    list-style-type: none;
    padding: 0;
    margin: 0;
}

.config-size-list li {
    margin-bottom: 10px;
}

.btn-filter {
    display: inline-block;
    width: auto;
    height: auto;
    margin: 10px 10px 0;
    padding: 10px 20px;
    font-size: 10px;
    color: #000000;
    background-color: #ffffff;
    border: 1px solid #333333;
    text-align: center;
    transition: background-color 0.3s ease, color 0.3s ease;
    cursor: pointer;
}

.btn-filter:hover {
    background-color: #000000;
    color: #ffffff;
}

.btn-filter.active {
    background-color: #000;
    color: white;
}

.btn-filter:active {
    background-color: #333333;
    color: #ffffff;
}

.btn-filter:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.1);
}

.option {
    background: #ffff;
    color: #000000;
    border: 1px solid #000000;
    padding: 5px 10px;
    font-size: 12px;
    display: inline-block;
    cursor: pointer;
    transition: background 0.3s, color 0.3s;
    margin: 3px;
}

.option.active {
    background: #333333;
    color: #fff;
    border-color: #333333;
}

@media (max-width: 480px) {
    .btn-filter {
        margin: 5px 6px 0;
        padding: 9px 12px;
    }
}

.mb90 {
    margin-bottom: 50px;
}


.ajax-loading {
    position: relative;
    min-height: 300px;
}

.ajax-loading::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    border: 3px solid rgba(205, 0, 0, 0.2);
    border-top-color: #cd0000;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    z-index: 100;
}

.ajax-loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(2px);
    z-index: 99;
}

@keyframes spin {
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

.product-container .product-item {
    position: relative;
}