.main{
    background-color: #f5f5f5;
    padding-bottom: 50px;
}

.part1{
    background-color: #fff;
    padding: 36px;
    display: flex;
}

.part2{
    padding: 40px;
}

.part-splitter{
    margin: 0 auto;
    width: calc(100% - 80px);
    height: 1px;
    background-color: #d9d9d9;
}

.part1 .left{
    width: calc(100% - 420px);
    flex: 0 0 auto;
}

.part1 .left h2{
    font-size: 20px;
    margin-bottom: 15px;
}

.part1 .left .desc{
    font-size: 14px;
}

.part1 .left .desc p{
    line-height: 26px;
}

.part1 .right{
    width: 420px;
    flex: 0 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding-right: 40px;
}

.part1 .right img{
    height: auto;
    width: auto;
    max-width: 100%;
}

.part3{
    margin-top: 50px;
    background-color: #fff;
}

.part2{
    background-color: #fff;
}

.part2 .tri-title{
    margin-bottom: 25px;
}


.catalog-list{
    display: flex;
    margin-right: -20px;
    flex-wrap: wrap;
    margin-bottom: -20px;
}

.catalog-list .catalog{
    width: calc(25% - 20px);
    margin-right: 20px;
    flex: 0 0 auto;
    background-color: #f5f5f5;
    padding: 10px 10px 0;
    margin-bottom: 20px;
}

.catalog-list .catalog img{
    display: block;
    width: 100%;
    height: auto;
}

.catalog-list .catalog .name{
    padding-top: 8px;
    padding-bottom: 8px;
    line-height: 24px;
    text-align: center;
    font-size: 14px;
    color: #636363;
}

@media (max-width: 1280px) {
    .catalog-list .catalog img{
        display: block;
        width: 100%;
        height: auto;
    }
}

@media (max-width: 960px) {
    .part1{
        flex-direction: column;
        padding: 30px;
    }
    .part2{
        padding: 30px;
    }
    .part-splitter{
        width: calc(100% - 60px);
    }
    .part1 .left{
        width: 100%;
        margin-bottom: 30px;
    }
    .part1 .right{
        width: 100%;
        padding-right: 0;
    }
    .part3{
        margin-top: 40px;
    }
    .catalog-list .catalog{
        width: calc(50% - 20px);
        flex: 0 0 auto;
    }
}

@media (max-width: 750px) {
    .part1{
        padding: 20px;
    }
    .part2{
        padding: 20px;
    }
    .part-splitter{
        width: calc(100% - 40px);
    }
    .part3{
        margin-top: 30px;
    }
    .catalog-list{
        margin-top: 20px;
    }
    .catalog-list .catalog{
        width: calc(100% - 20px);
        padding: 15px 15px 0;
    }
}