.solution-bg {
    width: 100%;
    height: 750rem;
    position: relative;
}

.solution-bg img {
    width: 100%;
    height: 100%;
}

.solution-title {
    position: absolute;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.25);
    display: flex;
    top: 0;
    left: 0;
}

.solution-title-text-en,
.solution-title-text {
    height: 72rem;
    font-family: HarmonyOS Sans SC, HarmonyOS Sans SC;
    font-weight: 500;
    font-size: 72rem;
    color: #FFFFFF;
    line-height: 72rem;
}

.solution-title-sub-text {
    height: 43rem;
    font-family: Source Han Sans, Source Han Sans;
    font-size: 30rem;
    color: #FFFFFF;
    line-height: 43rem;
}

.solution-nav {
    content: "";
    position: absolute;
    left: 50%;
    bottom: 0;
    height: 13.9vh;
    transform: translate(-50%, 50%);
    background-color: #fff;
    border-radius: 4rem;
    box-shadow: 0 4rem 12rem 0 rgba(0, 0, 0, 0.15);
    display: flex;
    justify-content: space-between;
    z-index: 2;
    align-items: center;
}
  
.solution-nav.fixed {
    /* position: fixed;
    top: calc(90rem + 1.39vh);
    transform: translateX(-50%);
    z-index: 3; */
}
  
.solution-nav .solution-nav-item {
    width: calc((1820 / 9) * 1rem);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    background-color: white;
}
  
.solution-nav-item.active,
.solution-nav-item:hover {
    background: #1d72f1;
    transition: all 0.4s ease-in-out;
    width: 206rem;
    height: 200rem;
    border-radius: 4rem;
}
  
.solution-nav-item-content {
    display: flex;
    flex-direction: column;
    align-items: center;
}
  
.solution-nav-item-content-bg {
    width: 40rem;
    height: 40rem;
    background-size: 100% 100%;
}
  
.solution-nav-item-content-bg.animation {
    background-image: url(../../img/project/nav/animation.png);
}
  
.solution-nav-item:hover .solution-nav-item-content-bg.animation,
.solution-nav-item.active .solution-nav-item-content-bg.animation {
    background-image: url(../../img/project/nav/animation-active.png);
}
  
.solution-nav-item-content-bg.bim {
    background-image: url(../../img/project/nav/bim.png);
}
  
.solution-nav-item:hover .solution-nav-item-content-bg.bim,
.solution-nav-item.active .solution-nav-item-content-bg.bim {
    background-image: url(../../img/project/nav/bim-active.png);
}

.solution-nav-item-content-bg.zhgd {
    background-image: url(../../img/project/nav/zhgd.png);
}
  
.solution-nav-item:hover .solution-nav-item-content-bg.zhgd,
.solution-nav-item.active .solution-nav-item-content-bg.zhgd {
    background-image: url(../../img/project/nav/zhgd-active.png);
}

.solution-nav-item-content-bg.observation {
    background-image: url(../../img/project/nav/observation.png);
}
  
.solution-nav-item:hover .solution-nav-item-content-bg.observation,
.solution-nav-item.active .solution-nav-item-content-bg.observation {
    background-image: url(../../img/project/nav/observation-active.png);
}
  
 
.solution-nav-item-content-title {
    height: 34rem;
    font-family: Source Han Sans, Source Han Sans;
    font-weight: 500;
    font-size: 20rem;
    color: #333333;
    line-height: 34rem;
}
  
.solution-nav-item.active .solution-nav-item-content-title,
.solution-nav-item:hover .solution-nav-item-content-title {
    color: #fff;
}

.solution-content {
    width: 100%;
    display: flex;
    overflow: hidden;
}

@media screen and (max-width: 500px) {
    .solution-bg {
        width: 100%;
        height: 212rem;
        position: relative;
    }

    .solution-title-text-en,
    .solution-title-text {
        height: 34rem;
        font-family: Source Han Sans, Source Han Sans;
        font-weight: 700;
        font-size: 16rem;
        color: #FFFFFF;
        line-height: 34rem;
        text-align: justify;
    }

    .solution-title-sub-text {
        height: 34rem;
        font-family: Source Han Sans, Source Han Sans;
        font-weight: 700;
        font-size: 16rem;
        color: #FFFFFF;
        line-height: 34rem;
        text-align: justify;
    }

    .solution-nav {
        display: none;
    }
}