.about-us .no-scrollbar {
    -ms-overflow-style: none;
    scrollbar-width: none;
}

.about-us .no-scrollbar::-webkit-scrollbar {
    display: none;
}

.about-us .base-maxwidth {
    max-width: 1350px;
}

.about-us .color {
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-image: linear-gradient(90.09deg, #B479FF 68.06%, #FC5EFF 84.79%, #FFC121 99.33%);
}
.about-us h1 {
    display: none;
}

.about-us h2,
.about-us h3 {
    font-size: 40px;
    line-height: 60px;
}

.about-us h2 {
    margin-bottom: 40px;
}

.about-us h3 {
    margin-bottom: 28px;
}

.top-content {
    padding-top: 160px;
    background: url(https://images.chatartpro.com/chatartweben/assets/company/globe.png) no-repeat calc(100% - 276px) 30% / 520px, url(https://images.chatartpro.com/chatartweben/assets/company/globe-bg.svg) no-repeat right top / 580px;
}

.top-content .content-item {
    margin-bottom: 80px;
}

.top-content .content-item img {
    margin-bottom: 28px;
}

.top-content .content-item p {
    max-width: 620px;
    font-size: 20px;
}

.milestone-box h2 {
    max-width: 1350px;
    margin: 0 auto 40px;
}

.milestone-box .milestone-list {
    display: flex;
    align-items: flex-start;
    padding: 0 20px 20px 12%;
    justify-content: center;
}

.milestone-box .milestone-list li {
    flex-shrink: 0; 
    display: flex;
    align-items: flex-start;
}

.milestone-box .milestone-list .desc {
    position: relative;
    max-width: 262px;
    width: 262px;
    border-radius: 24px;
    padding: 58px 24px;
}

.milestone-box .milestone-list .time {
    position: absolute;
    top: -49px;
    right: 0;
    font-size: 22px;
    line-height: 33px;
}

.milestone-box .milestone-list .text {
    font-size: 24px;
    font-weight: 600;
    line-height: 36px;
    color: var(--color-block-darker);  
}

.milestone-box .milestone-list .line {
    margin: 0 30px;
    width: 1px;
    height: 412px;
    background: linear-gradient(180deg, rgba(104, 91, 255, 0) 0%, rgba(104, 91, 255, 0.2) 50%, rgba(104, 91, 255, 0) 100%);
}

.milestone-box .milestone-list li:nth-child(1) .desc {
    background-color:#4AA7FF;
    margin-top: 50px;
}

.milestone-box .milestone-list li:nth-child(2) .desc {
    background-color:#FFE55E;
    margin-top: 160px;
}

.milestone-box .milestone-list li:nth-child(3) .desc {
    background-color: #DEA3FA;
    margin-top: 270px;
}

.milestone-box .milestone-list li:nth-child(4) .desc {
    background-color: #9288FF;
    margin-top: 140px;
}

.milestone-box .milestone-list li:nth-child(5) .desc {
    background-color:#FFBC2E;
    margin-top: 210px;
}

.milestone-box .milestone-list li:nth-child(1) .desc::before {
    content: '';
    position: absolute;
    top: -86px;
    left: -80px;
    width: 192px;
    height: 156px;
    background: url(https://images.chatartpro.com/chatartweben/assets/company/celebrate.png) no-repeat center/cover;
}

.milestone-box .milestone-list li:nth-child(3) .desc::before {
    content: '';
    position: absolute;
    top: -60px;
    left: -55px;
    width: 106px;
    height: 127px;
    background: url(https://images.chatartpro.com/chatartweben/assets/company/star.png) no-repeat center/cover;
}

.milestone-box .milestone-list li:nth-child(5) .desc::before {
    content: '';
    position: absolute;
    top: -62px;
    left: -34px;
    width: 102px;
    height: 102px;
    background: url(https://images.chatartpro.com/chatartweben/assets/company/like.png) no-repeat center/cover;
}

main .base-switching-button {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 100px auto 120px;
}

main .base-switching-button .button {
    min-width: 240px;
    height: 80px;
    padding: 10px 20px;
    border-radius: 16px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: 500;
    color: var(--color-white-lighter);
    white-space: nowrap;
    background-color: #000;
    font-size: 24px;
    font-weight: 700;
}

main .base-version-switching {
    align-items: center;
    margin-top: 20px;
}

main .base-version-switching .version-switching-icon {
    display: flex;
    margin-left: 12px;
    justify-content: center;
    color: rgba(0, 0, 0, 0.4);
    border: none;
    background-color: transparent;
    cursor: pointer;
    transition: all .3s;
}

main .base-version-switching .version-switching-icon.active,
main .base-version-switching .version-switching-icon:hover {
    color: var(--color-primary);
}

main .base-version-switching > p {
    color:rgba(0, 0, 0, 0.4);
}

main .base-version-switching .version-switching-icon svg {
    width: 20px;
    height: 20px;
    transition: all .3s;
}

main .base-switching-button .button svg {
    margin-left: 8px;
}

@media (max-width: 1550px) {
    .top-content {
        background: url(https://images.chatartpro.com/chatartweben/assets/company/globe.png) no-repeat calc(100% - 180px) 20% / 400px, url(https://images.chatartpro.com/chatartweben/assets/company/globe-bg.svg) no-repeat 100% 0% / 416px;
        padding-top: 98px;
    }

    .milestone-box h2 {
        padding: 0 14px;
    }

    .milestone-box .milestone-list {
        padding-left: 80px;
        cursor: all-scroll;
        overflow-x: auto;
        justify-content: flex-start;
    }
}

@media (max-width: 1110px) {

    .about-us h2,
    .about-us h3 {
        font-size: 32px;
        line-height: 48px;
    }

    .top-content {
        background: none;
    }

    .top-content h2 {
        margin-bottom: 20px;
    }

    .top-content .content-item {
        margin-bottom: 40px;
    }

    .top-content .content-item p {
        font-size: 16px;
        line-height: 24px;
        max-width: 100%;
    }

    .milestone-box .milestone-list {
        padding-left: 40px;
    }

    .milestone-box .milestone-list .desc {
        width: 220px;
        padding: 40px 24px;
    }

    .milestone-box .milestone-list .time {
        top: -40px;
        font-size: 20px;
        line-height: 30px;
    }

    .milestone-box .milestone-list .text {
        font-size: 20px;
        font-weight: 500;
        line-height: 30px;
    }

    .milestone-box .milestone-list .line {
        background: none;
        width: 0;
        margin: 0 12px;
    }

    .milestone-box .milestone-list li:nth-child(1) .desc::before {
        top: -60px;
        left: -30px;
        width: 100px;
        height: 102px;
    }

    .milestone-box .milestone-list li:nth-child(3) .desc::before {
        top: -40px;
        left: -30px;
        width: 70px;
        height: 84px;
    }

    .milestone-box .milestone-list li:nth-child(5) .desc::before {
        top: -42px;
        left: -25px;
        width: 80px;
        height: 80px;
    }

    main .base-switching-button {
        margin: 40px auto 60px;
    }

    main .base-switching-button .button {
        min-width: 220px;
        height: 74px;
        font-size: 20px;
    }
}

@media (max-width: 768px) {
    main .base-version-switching {
        display: none;
    }

    main .amt-utils[data-pid="100333"] .amt-btn-group {
        margin-bottom: 30px;
    }
    
    main .amt-utils[data-pid="100333"] .download {
        position: relative;
    }
    
    main .amt-utils[data-pid="100333"] .download::after {
        content: '100% Secure';
        position: absolute;
        bottom: -28px;
        font-size: 16px;
        color: rgba(51, 51, 51, .6);
        padding-left: 22px;
        background: url(https://images.chatartpro.com/chatartweben/assets/common/secure-icon.svg) no-repeat left center/20px;
        pointer-events: none;
        font-weight: 400;
    }
}