.section4 {
    padding: 0;
}

.Box4 {
    position: relative;
    width: 100%;
    height: 100%;
    z-index: 2;
    display: flex;
    flex-wrap: wrap;
}

.lt4 {
    width: 50%;
    height: 100%;
}

.lt4 img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.rt4 {
    width: 50%;
    height: 100%;
    padding-top: 90px;
    padding-left: 120px;
    padding-right: var(--container);
    padding-bottom: 25vw;
    display: flex;
    flex-direction: column;
    justify-content: center;
    grid-gap: 30px;
}

.rt4 .indexTitle {
    color: #fff;
}

.desc4 {
    font-size: 16px;
    line-height: 1.5;
    color: #FFFFFF;
    opacity: 0.8;
}

.shuzi {
    position: absolute;
    bottom: 0;
    width: 100%;
    display: flex;
    flex-wrap: wrap;
    justify-content: end;
}

.item4 {
    width: 25vw;
    height: 25vw;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    grid-gap: 45px;
    background: rgba(0, 107, 183, 0.6);
}

.item4:nth-child(2) {
    background: rgba(0, 107, 183, 0.8);
}

.item4:nth-child(3) {
    background: rgba(0, 107, 183, 0.7);
}

.item4 p {
    font-weight: 700;
    font-size: 18px;
    line-height: 1;
    text-align: center;
    color: #FFFFFF;
}

.item4 span {
    width: 10vw;
    height: 10vw;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    grid-gap: 20px;
    border-radius: 50%;
    border: 4px solid #FFFFFF20;
    position: relative;
}

.item4 span::after {
    content: "";
    display: block;
    width: calc(100% + 8px);
    height: calc(100% + 8px);
    border-radius: 50%;
    position: absolute;
    /* 移除原边框 */
    border: none;
    /* 锥形渐变背景：0%-45%显示白色，其余透明 */
    background: conic-gradient(from 0deg, #fff 0%, #fff 45%, transparent 45%, transparent 100%);
    /* 遮罩：创建4px宽度的圆环（与原边框粗细一致） */
    -webkit-mask: radial-gradient(circle,
            transparent calc(70% - 2px),
            #fff calc(50% - 2px),
            #fff calc(50% + 2px),
            transparent calc(100% + 2px));
    mask: radial-gradient(circle,
            transparent calc(70% - 2px),
            #fff calc(50% - 2px),
            #fff calc(50% + 2px),
            transparent calc(100% + 2px));
}

.item4 span h1 {
    color: #fff;
    font-size: 42px;
    line-height: 1;
}

.item4 span b {
    color: #fff;
    font-size: 16px;
    line-height: 1;
}

@media (max-width: 1600px) {}

@media (max-width: 1440px) {
    .rt4 {
        padding-left: 45px;
        grid-gap: 15px;
    }

    .desc4 {
        font-size: 14px;
    }

    .item4 {
        grid-gap: 15px;
    }

    .item4 span {
        width: 13vw;
        height: 13vw;
    }

    .item4 span h1 {
        font-size: 36px;
    }
}

@media (max-width: 1200px) {
    .lt4 {
        height: auto;
    }

    .rt4 {
        padding-bottom: calc(25vw + 60px);
    }
}

@media (max-width: 1000px) {
    .lt4 {
        height: auto;
    }

    .rt4 {
        height: auto;
        padding: 0 var(--container);
    }

    .shuzi {
        position: relative;
    }

    .item4 {
        width: 33.333vw;
        height: 33.333vw;
    }

    .item4 span {
        width: 20vw;
        height: 20vw;
    }

    .item4 {
        background: rgba(0, 107, 183, 0.8);
    }

    .item4:nth-child(2) {
        background: rgba(0, 107, 183, 1);
    }

    .item4:nth-child(3) {
        background: rgba(0, 107, 183, 0.9);
    }


}

@media (max-width: 720px) {
    .lt4 {
        width: 100%;
    }

    .rt4 {
        width: 100%;
        padding: 60px var(--container);
    }

    .item4 p {
        font-size: 16px;
    }

    .item4 span {
        grid-gap: 10px;
    }

    .item4 span h1 {
        font-size: 24px;
    }
}

@media (max-width: 460px) {
    .item4 {
        height: 150px;
    }

    .item4 span {
        width: 25vw;
        height: 25vw;
    }

    .item4 span h1 {
        font-size: 20px;
    }

    .item4 span b {
        font-size: 14px;
    }
}

@media (max-width: 380px) {}