#container {
    background-color: #000;
}


/* first-section */
.first-section {
    height: 100vh;
    min-height: 800px;
    overflow: hidden;
    position: relative;
}

.slide-area,
.slick-list,
.slick-track {
    height: 100%;
}

.slide-progress {
    position: absolute;
    left: 50%;
    bottom: 80px;
    transform: translateX(-50%);
    max-width: 1280px;
    width: calc(100% - 68px);
    height: 2px;
    background-color: rgba(255, 255, 255, 0.3);
    z-index: 5;
}

.slide-progress span {
    display: block;
    position: absolute;
    width: 0;
    height: 4px;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    background-color: var(--colorWhite);
}

.slide-progress span.active {
    animation: progressBar 5s linear forwards;
}

@keyframes progressBar {
    from {
        width: 0;
    }

    to {
        width: 100%;
    }
}

.slide-group {
    width: 100%;
    height: 100%;
    background-position: center center;
    background-repeat: no-repeat;
    background-size: cover;
    position: relative;
}

.slide-group::before {
    content: "";
    width: 100%;
    height: 50%;
    background: linear-gradient(0deg, rgba(0, 0, 0, .6) 10%, rgba(0, 0, 0, .5) 30%, rgba(0, 0, 0, .2) 60%, transparent);
    position: absolute;
    bottom: 0;
    left: 0;
}

.first-slide-group {
    background-image: url(/images/main/slide-img1.png);
}

.second-slide-group {
    background-image: url(/images/main/slide-img2.png);
}

.third-slide-group {
    background-image: url(/images/main/slide-img3.png);
}

.slide-group .content-inner {
    height: 100%;
    position: relative;
}

.first-section .title-group {
    gap: 28px 0;
    position: absolute;
    bottom: 178px;
    left: 0;
}

.first-section .desc {
    font-size: var(--fontSizeXl);
    line-height: var(--lineHeightXl);
    font-weight: var(--fontWeightSemibold);
}

/* first-section */


/* second-section */
.second-section {
    padding: 200px 0;
}

.second-section .content-inner {
    display: flex;
    align-items: flex-start;
    flex-direction: column;
    gap: 80px 0;
}

.second-section .title-group {
    gap: 22px 0;
}

.about-box {
    width: 100%;
    position: relative;
}

.about-box ul {
    width: 100%;
    display: grid;
    align-items: flex-start;
    grid-template-columns: repeat(auto-fit, minmax(0, 1fr));
}

.about-box ul li {
    width: auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: 80px 0;
    opacity: .5;
    transition: opacity .5s;
}

.icon-step {
    width: 100%;
    display: flex;
    align-items: flex-start;
    gap: 0 30px;
}

.icon-step span {
    font-size: var(--fontSizeMd);
    font-weight: var(--fontWeightSemibold);
    color: var(--colorWhite);
}

.icon-step img {
    margin-top: 12px;
}

.about-box .title-group {
    width: 100%;
    padding-left: 50px;
    box-sizing: border-box;
    gap: 18px;
    position: relative;
}

.about-box .title-group::before {
    content: "";
    width: 9px;
    height: 9px;
    border-radius: 10px;
    background-color: var(--colorPrimary);
    box-shadow: 0 0 12px 4px rgba(32, 232, 198, 0.75);
    position: absolute;
    top: -44px;
    left: 0;
    z-index: 5;
}

.about-box .title-group p {
    font-size: var(--fontSizeXl);
    font-weight: var(--fontWeightBold);
    line-height: var(--lineHeightBase);
    color: var(--colorWhite);
}

.about-box .title-group .desc {
    font-size: var(--fontSizeBase);
    line-height: var(--lineHeightSm);
}

.about-prograss-bar {
    width: 100%;
    height: 1px;
    position: absolute;
    background-color: rgba(219, 219, 219, 0.5);
    top: 160px;
    left: 0;
}

.about-prograss-bar span {
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    width: 0;
    height: 2px;
    background-color: var(--colorWhite);
    transition: width .1s linear;
}

/* second-section */


/* third-section */
.third-section {
    padding-top: 120px;
}

.third-section ul {
    width: 100%;
    display: grid;
    grid-template-columns: 1fr;
    gap: 180px 0;
}

.third-section ul li {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 0 120px;
    opacity: 0;
    transform: translateY(80px);
    transition:
        opacity 2s cubic-bezier(0.22, 1, 0.36, 1),
        transform 2s cubic-bezier(0.22, 1, 0.36, 1);
}

.third-section ul li:nth-child(2n) {
    justify-content: space-between;
    flex-direction: row-reverse;
}

.third-section .desc {
    color: var(--colorGray400);
}

/* third-section */


/* fourth-section */
.fourth-section {
    padding-top: 280px;
}

.fourth-section .content-inner {
    display: flex;
    align-items: center;
    flex-direction: column;
    gap: 80px 0;
}

.fourth-section .title-group {
    align-items: center;
}

.usage-box {
    width: 100%;
}

.usage-box ul {
    width: 100%;
    display: grid;
    align-items: flex-start;
    grid-template-columns: repeat(auto-fit, minmax(0, 1fr));
    gap: 0 36px;
}

.usage-box ul li {
    width: auto;
    display: flex;
    align-items: flex-start;
    flex-direction: column;
    gap: 22px 0;
}

.usage-box .title-group {
    align-items: flex-start;
    gap: 12px 0;
}

.usage-box .title-group p {
    color: var(--colorWhite);
    font-size: var(--fontSize2Xl);
    font-weight: var(--fontWeightBold);
    line-height: var(--lineHeight2Xl);
}

.usage-box .desc {
    font-size: var(--fontSizeBase);
    line-height: var(--lineHeightSm);
}

/* fourth-section */





/* responsive css */
@media screen and (min-width: 768px) and (max-width: 1279px) {

    /* first-section */
    .first-section {
        min-height: 1024px;
    }

    .slide-progress {
        bottom: 60px;
        height: 3px;
    }

    .first-slide-group {
        background-image: url(/images/main/mobile-slide-img1.png);
    }

    .second-slide-group {
        background-image: url(/images/main/mobile-slide-img2.png);
    }

    .third-slide-group {
        background-image: url(/images/main/mobile-slide-img3.png);
    }


    .first-section .title-group {
        gap: 25px 0;
        bottom: 165px;
    }

    .first-section .desc {
        font-size: var(--fontSizeMd);
        line-height: var(--lineHeightMd);
    }

    /* first-section */


    /* second-section */
    .second-section {
        padding: 80px 0;
    }

    .second-section .content-inner {
        gap: 100px 0;
    }

    .second-section .title-group {
        gap: 20px 0;
    }

    .about-box {
        padding: 0 40px;
        box-sizing: border-box;
    }

    .about-box ul {
        grid-template-columns: 1fr;
        gap: 90px 0;
    }

    .about-box ul li {
        display: flex;
        align-items: center;
        gap: 0 40px;
    }

    .icon-step {
        min-width: 196px;
        width: max-content;
        align-items: center;
        gap: 0 65px;
    }

    .icon-step img {
        margin-top: 0;
    }

    .about-box .title-group {
        width: max-content;
        padding-left: 0;
        gap: 15px 0;
    }

    .about-box .title-group::before {
        top: 40px;
        left: -188px;
    }

    .about-box .title-group p {
        font-size: var(--fontSizeLg);
        line-height: var(--lineHeightLg);
    }

    .about-box .title-group .desc {
        font-size: var(--fontSizeSm);
        line-height: var(--lineHeightXs);
    }

    .about-prograss-bar {
        width: 600px;
        height: 1px;
        top: 350px;
        left: -207px;
        transform: rotate(90deg);
    }

    .about-prograss-bar span {
        height: 1px;
    }

    /* second-section */


    /* third-section */
    .third-section {
        padding-top: 80px;
    }

    .third-section ul {
        gap: 80px 0;
    }

    .third-section ul li {
        width: 100%;
        align-items: flex-start;
        flex-direction: column;
        gap: 40px 0;
    }

    .third-section ul li:nth-child(2n) {
        flex-direction: column;
    }

    .show-up-img,
    .show-up-img img {
        width: 100%;
    }

    /* third-section */


    /* fourth-section */
    .fourth-section {
        padding-top: 160px;
    }

    .fourth-section .content-inner {
        gap: 40px 0;
    }

    .usage-box ul {
        gap: 0 12px;
    }

    .usage-box ul li {
        gap: 20px 0;
    }

    .usage-box .title-group {
        gap: 12px 0;
    }

    .usage-box .title-group p {
        font-size: var(--fontSizeLg);
        line-height: normal;
    }

    .usage-box ul li:first-child .title-group p {
        width: 120px;
    }

    .usage-box .desc {
        display: none;
    }

    /* fourth-section */
}

@media screen and (max-width: 767px) {

    /* first-section */
    .first-section {
        min-height: 704px;
    }

    .slide-area,
    .slick-list,
    .slick-track {
        height: 100%;
    }

    .slide-progress {
        max-width: 100%;
        width: calc(100% - 40px);
        bottom: 50px;
    }

    .slide-progress span {
        height: 3px;
    }

    .first-slide-group {
        background-image: url(/images/main/mobile-slide-img1.png);
    }

    .second-slide-group {
        background-image: url(/images/main/mobile-slide-img2.png);
    }

    .third-slide-group {
        background-image: url(/images/main/mobile-slide-img3.png);
    }

    .first-section .title-group {
        gap: 20px 0;
        bottom: 106px;
    }

    .first-section .desc {
        font-size: var(--fontSizeSm);
        line-height: 24px;
    }

    /* first-section */


    /* second-section */
    .second-section {
        padding: 60px 0;
    }

    .second-section .content-inner {
        gap: 40px 0;
    }

    .second-section .title-group {
        gap: 20px 0;
    }

    .about-box {
        padding: 0;
    }

    .about-box ul {
        grid-template-columns: 1fr;
        gap: 40px 0;
    }

    .about-box ul li {
        display: flex;
        flex-direction: column;
        gap: 20px 0;
    }

    .icon-step {
        min-width: 173px;
        width: max-content;
        align-items: center;
        gap: 0 65px;
    }

    .icon-step img {
        margin-top: 0;
        width: 90px;
    }

    .about-box .title-group {
        width: 100%;
        padding-left: 80px;
        gap: 5px 0;
    }

    .about-box .title-group::before {
        width: 7px;
        height: 7px;
        top: -20px;
        left: 35px;
    }

    .about-box .title-group p {
        font-size: var(--fontSizeMd);
        line-height: var(--lineHeightMd);
    }

    .about-box .title-group .desc {
        font-size: var(--fontSizeSm);
        line-height: var(--lineHeightXs);
    }

    .about-prograss-bar {
        width: 830px;
        height: 1px;
        top: 505px;
        left: -376px;
        transform: rotate(90deg);
    }

    .about-prograss-bar span {
        height: 1px;
    }

    /* second-section */


    /* third-section */
    .third-section {
        padding-top: 60px;
    }

    .third-section ul {
        gap: 60px 0;
    }

    .third-section ul li {
        flex-direction: column;
        align-items: flex-start;
        gap: 30px 0;
    }

    .third-section ul li:nth-child(2n) {
        flex-direction: column;
        align-items: flex-start;
    }

    .third-section .desc br {
        display: none;
    }

    /* third-section */


    /* fourth-section */
    .fourth-section {
        padding-top: 80px;
    }

    .fourth-section .content-inner {
        gap: 30px 0;
    }

    .fourth-section .desc {
        text-align: center;
    }

    .usage-box ul {
        grid-template-columns: 1fr 1fr;
        gap: 30px 8px;
    }

    .usage-box ul li {
        width: auto;
        display: flex;
        align-items: flex-start;
        flex-direction: column;
        gap: 20px 0;
    }

    .usage-box .title-group p {
        font-size: var(--fontSizeMd);
        line-height: var(--lineHeightMd);
    }

    .usage-box ul li:first-child .title-group p {
        width: 120px;
    }

    .usage-box .desc {
        display: none;
    }

    /* fourth-section */
}