/* 平台图标显示/隐藏控制 */
.platform2-item {
    position: relative;
}

.platform2-item .platform2-item-img {

}

.platform2-item .platform2-item-img:nth-of-type(1) {
    opacity: 0; /* 默认隐藏彩色图标 */
}

.platform2-item .platform2-item-img:nth-of-type(2) {
    opacity: 1; /* 默认显示灰色图标 */
}

.platform2-item.active .platform2-item-img:nth-of-type(1) {
    opacity: 1; /* 激活时显示彩色图标 */
}

.platform2-item.active .platform2-item-img:nth-of-type(2) {
    opacity: 0; /* 激活时隐藏灰色图标 */
}