@font-face {
    font-family: "Pretendard";
    src: url("../fonts/pretendard/Pretendard-Medium.otf") format("opentype");
    font-weight: 500;
}

@font-face {
    font-family: "Pretendard";
    src: url("../fonts/pretendard/Pretendard-SemiBold.otf") format("opentype");
    font-weight: 700;
}


@font-face {
    font-family: "Pretendard";
    src: url("../fonts/pretendard/Pretendard-ExtraBold.otf") format("opentype");
    font-weight: 800;
}

@font-face {
    font-family: "Pretendard";
    src: url("../fonts/pretendard/Pretendard-Black.otf") format("opentype");
    font-weight: 900;
}

@font-face {
    font-family: "Helvetica";
    src: url("../fonts/helvetica/HelveticaNeueLTPro-Roman.otf");
    font-weight: 500;
    unicode-range: U+0041-005A, U+0061-007A, U+0030-0039, U+002C, U+002E, U+2014, U+2018, U+2019;
}

@font-face {
    font-family: "Helvetica";
    src: url("../fonts/helvetica/HelveticaNeueLTPro-Md.otf");
    font-weight: 700;
    unicode-range: U+0041-005A, U+0061-007A, U+0030-0039, U+002C, U+002E, U+2014, U+2018, U+2019;
}

@font-face {
    font-family: "Helvetica";
    src: url("../fonts/helvetica/HelveticaNeueLTPro-Hv.otf");
    font-weight: 800;
    unicode-range: U+0041-005A, U+0061-007A, U+0030-0039, U+002C, U+002E, U+2014, U+2018, U+2019;
}

@font-face {
    font-family: "Helvetica";
    src: url("../fonts/helvetica/HelveticaNeueLTPro-Blk.otf");
    font-weight: 900;
    unicode-range: U+0041-005A, U+0061-007A, U+0030-0039, U+002C, U+002E, U+2014, U+2018, U+2019;
}

:root {
    --std: 16px;
    --ratio: 5.0;
}

* {
    margin: 0;
    padding: 0;
    -webkit-box-sizing: border-box;
            box-sizing: border-box;
    font-family: "Helvetica", "Pretendard", "Apple SD Gothic Neo", "Segoe UI", "Roboto", "Noto Sans", sans-serif;
    font-size: inherit;
    font-weight: inherit;
    font-style: inherit;
    line-height: 1;
    text-decoration: none;
    text-transform: none;
    list-style-type: none;
    color: inherit;
    scroll-behavior: smooth;
    -webkit-user-select: none;
       -moz-user-select: none;
        -ms-user-select: none;
            user-select: none;
    word-break: keep-all;
    overflow-wrap: break-word;
    -webkit-text-size-adjust: 100%;
       -moz-text-size-adjust: 100%;
        -ms-text-size-adjust: 100%;
            text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
}

*, html, body {
    /* -ms-scroll-chaining: none;
        overscroll-behavior: contain; */
}

html {
    font-size: 16px;
}

a, button {
    cursor: pointer;
    user-drag: none; /* Safari */
    -webkit-user-drag: none; /* Chrome */
}

a:hover, button:hover {
    opacity: 0.5 !important;
}

#main-content a {
    padding-bottom: 0.1em;
    border-bottom: 1px solid rgb(150, 150, 150);
}

strong {
    font-weight: 800;
}

/* app */
#app {
    width: 100%;
    opacity: 0;
}

@-webkit-keyframes fadeIn {
    0% {
        opacity: 0;
    }

    100% {
        opacity: 1;
    }
}

@keyframes fadeIn {
    0% {
        opacity: 0;
    }

    100% {
        opacity: 1;
    }
}

#app.active {
    opacity: 0;
    -webkit-animation-name: fadeIn;
            animation-name: fadeIn;
    -webkit-animation-duration: 1s;
            animation-duration: 1s;
    -webkit-animation-fill-mode: forwards;
            animation-fill-mode: forwards;
}

#home {
    position: relative;
    width: 100%;
    height: 100vh;
    height: calc(var(--vh, 1vh) * 100);
    overflow: hidden;
}

#cont-exhibition {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.exhibition {
    position: absolute;
    top: 0;
    left: 0;
    display: block;
    width: calc(var(--std) * 12.5);
    height: auto;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
        -ms-flex-align: center;
            align-items: center;
    -webkit-box-pack: center;
        -ms-flex-pack: center;
            justify-content: center;
    will-change: top, left;
    opacity: 0;
    -webkit-animation-name: fadeIn;
            animation-name: fadeIn;
    -webkit-animation-duration: 1s;
            animation-duration: 1s;
    -webkit-animation-fill-mode: forwards;
            animation-fill-mode: forwards;
}

@-webkit-keyframes rotation {
    0% {
        -webkit-transform: rotate(0deg);
                transform: rotate(0deg);
    }

    100% {
        -webkit-transform: rotate(360deg);
                transform: rotate(360deg);
    }
}

@keyframes rotation {
    0% {
        -webkit-transform: rotate(0deg);
                transform: rotate(0deg);
    }

    100% {
        -webkit-transform: rotate(360deg);
                transform: rotate(360deg);
    }
}

.exhibition > img {
    width: 100%;
    height: auto;
    -webkit-animation-name: rotation;
            animation-name: rotation;
    -webkit-animation-duration: 10s;
            animation-duration: 10s;
    -webkit-animation-iteration-count: infinite;
            animation-iteration-count: infinite;
    -webkit-animation-timing-function: linear;
            animation-timing-function: linear;
}

/* main-header */
#main-header {
    padding: calc(var(--std) * 1.25) calc((100% - 960px) / 2);
    position: absolute;
    bottom: 0;
    z-index: 100;
    width: 100%;
    height: calc(var(--std) * (1.25 + 2.5 + 1.25));
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
        -ms-flex-align: center;
            align-items: center;
    -webkit-box-pack: justify;
        -ms-flex-pack: justify;
            justify-content: space-between;
    -webkit-transition: height 0.25s ease, padding 0.25s ease;
    -o-transition: height 0.25s ease, padding 0.25s ease;
    transition: height 0.25s ease, padding 0.25s ease;
    will-change: height, padding;
    /* background-color: rgb(255, 255, 255); */
}

#main-header.is-sticky {
    position: fixed;
    top: 0;
    bottom: auto;
    height: calc(var(--std) * 2.750);
    padding: calc(var(--std) * 0.75) calc((100% - 960px) / 2);
    background-color: rgb(0, 255, 155);
        -webkit-box-shadow: 0 2px 8px rgba(50, 50, 50, 0.1);
    box-shadow: 0 2px 8px rgba(50, 50, 50, 0.1);
}

#main-header.is-sticky .item-main-header {
    font-size: 1.25rem;
}

#main-header.is-sticky > .cont-logo > .logo {
    height: calc(var(--std) * 1.25);
}

.item-main-header {
    font-size: 2rem;
    letter-spacing: 0.005em;
    word-spacing: 0.075em;
    font-weight: 900;
    /* -webkit-transition: font-size 0.25s ease;
    -o-transition: font-size 0.25s ease;
    transition: font-size 0.25s ease; */
}

.item-main-header:nth-child(2) {
    word-spacing: 0;
}

#main-header > .cont-logo {
    padding: 0 calc(var(--std) * 1.25);
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
        -ms-flex-align: center;
            align-items: center;
    -webkit-box-pack: justify;
        -ms-flex-pack: justify;
            justify-content: space-between;
    pointer-events: none;
}

.cont-logo > .logo {
    width: auto;
    height: calc(var(--std) * 2.5);
    /* -webkit-transition: height 0.25s ease;
    -o-transition: height 0.25s ease;
    transition: height 0.25s ease; */
}

/* main-content */
#main-content {
    margin: calc(var(--std) * (1.25 + 2.5 + 1.25) * 1.25) 0 calc(var(--std) * (1.25 + 2.5 + 1.25) * 2.5) 0;
    padding: 0 calc((100% - 960px) / 2);
    width: 100%;
    background-color: rgb(255, 255,255);
}

#cont-section {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
        -ms-flex-direction: column;
            flex-direction: column;
    /* gap: calc(var(--std) * (1.25 + 2.5)); */
}

section.section {
    padding: calc(var(--std) * (1.25 + 2.5 + 1.25)) 0;
    width: 100%;
    height: auto;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
        -ms-flex-direction: column;
            flex-direction: column;
    gap: calc(var(--std) * (1.25 + 2.5));
}

section.section:first-child {
    padding-top: 0;
}

section.section:nth-child(2n) {
    padding-left: calc(var(--std) * (1.25 + 2.5));
    border-left: 1px solid rgb(0, 255, 155);
    border-bottom: 1px solid rgb(0, 255, 155);
}

section.section:nth-child(2n-1) {
    padding-right: calc(var(--std) * (1.25 + 2.5));
    border-right: 1px solid rgb(130, 0, 255);
    border-bottom: 1px solid rgb(130, 0, 255);
}

section.section:last-child {
    padding-bottom: 0;
    border-bottom: none;
}

.section > .heading {
    font-size: 2rem;
    line-height: 1.75;
    font-weight: 900;
}

.section:nth-child(2n) > .heading {
    /* color: rgb(0, 215, 115); */
}

.section:nth-child(2n-1) > .heading {
    /* color: rgb(130, 0, 255); */
}

.section > .content p {
    font-size: 1.5rem;
    line-height: 1.75;
    font-weight: 500;
}

.section > .content .two-column {
    padding-top: calc(var(--std) * (1.25 * 0.25));
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    gap: calc(var(--std) * 1.25);
    border-top: 1px solid rgb(150, 150, 150);
}

.section > .content .two-column > .item-column:nth-child(1) {
    width: calc((100% - var(--std) * 1.25) / 5 * 1);
}

.section > .content .two-column > .item-column:nth-child(1) > p {
    font-weight: 800;
}

.section > .content .two-column > .item-column:nth-child(2) {
    width: calc((100% - var(--std) * 1.25) / 5 * 4);
}

.section > .content ul li {
    margin-left: 1rem;
    font-size: 1.25rem;
    line-height: 1.75;
    list-style-type: "- ";
    font-weight: 500;
}

.section > .content ul.normal li {
    margin-left: 1.5rem;
    font-size: 1.5rem;
    line-height: 1.75;
    list-style-type: square;
    font-weight: 500;
}

.section > .content ol li {
    margin-left: 1.5rem;
    font-size: 1.25rem;
    line-height: 1.75;
    list-style-type: decimal;
    font-weight: 500;
}

.section > .content .box {
    padding-right: calc(var(--std) * 1.25);
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
        -ms-flex-direction: column;
            flex-direction: column;
    gap: calc(var(--std) * 1.25);
    border-top: 1px dashed rgb(150, 150, 150);
    border-right: 1px dashed rgb(150, 150, 150);
}

.section:nth-child(2n) > .content .box {
    border-top: 1px dashed rgb(0, 255, 155);
    border-right: 1px dashed rgb(0, 255, 155);
}

.section:nth-child(2n-1) > .content .box {
    border-top: 1px dashed rgb(130, 0, 255);
    border-right: 1px dashed rgb(130, 0, 255);
}

.section > .content .box .two-column:nth-child(1) {
    border-top: none;
}

.section > .content .box .heading {
    font-size: 1.5rem;
    line-height: 1.75;
    font-weight: 800;
}

/* main-footer */
#main-footer {
    margin: 0 calc(var(--std) * 1.25);
    padding: 0 calc((100% - 960px) / 2 - var(--std) * 1.25);
    margin-bottom: calc(var(--std) * 1.25);
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    width: calc(100% - var(--std) * (1.25 * 2.0));
    gap: calc(var(--std) * 1.25);
}

#main-footer > .left {
    width: calc((100% - var(--std) * 1.25) / 5 * 1 - var(--std) * 1.25);
}

#main-footer > .left > a {
    font-size: 1.5rem;
    line-height: 1.75;
    font-weight: 700;
    width: calc(var(--std) * (1.25 + 2.5));
    height: calc(var(--std) * (1.25 + 2.5));
    background-color: rgb(0, 255, 155);
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
        -ms-flex-align: center;
            align-items: center;
    -webkit-box-pack: center;
        -ms-flex-pack: center;
            justify-content: center;
}

#main-footer > .right {
    width: calc((100% - var(--std) * 1.25) / 5 * 4 + var(--std) * 1.25);
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    gap: calc(var(--std) * 1.25);
}

a.item-right {
    width: calc((100% - (var(--std) * 1.25) * 2) / 3);
    height: calc(var(--std) * (1.25 + 2.5));
    background-color: rgb(130, 0, 255);
    color: rgb(255, 255, 255);
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
        -ms-flex-align: center;
            align-items: center;
    -webkit-box-pack: center;
        -ms-flex-pack: center;
            justify-content: center;
    text-align: center;
    font-size: 1.5rem;
    line-height: 1.25;
    font-weight: 700;
}

a.item-right:last-child {
    background-color: rgb(0, 255, 155);
    color: rgb(0, 0, 0);
}

#main-footer > .below {
    font-size: 1.25rem;
    line-height: 1.25;
    font-weight: 500;
    text-align: center;
}

/* grid */
#cont-grid {
    display: none;
}

.grid {
    position: fixed;
    z-index: 1000;
}

.grid:nth-child(1) {
    top: calc(var(--std) * 1.25);
    left: 0;
    width: 100%;
    height: 1px;
    background-color: rgb(255, 0, 0);
}

.grid:nth-child(2) {
    bottom: calc(var(--std) * 1.25);
    left: 0;
    width: 100%;
    height: 1px;
    background-color: rgb(255, 0, 0);
}

.grid:nth-child(3) {
    top: 0;
    left: calc(var(--std) * 1.25);
    width: 1px;
    height: 100%;
    background-color: rgb(255, 0, 0);
}

.grid:nth-child(4) {
    top: 0;
    right: calc(var(--std) * 1.25);
    width: 1px;
    height: 100%;
    background-color: rgb(255, 0, 0);
}

.grid:nth-child(5) {
    top: 0;
    left: calc((100% - 960px) / 2);
    width: 1px;
    height: 100%;
    background-color: rgb(255, 0, 0);
}

.grid:nth-child(6) {
    top: 0;
    right: calc((100% - 960px) / 2);
    width: 1px;
    height: 100%;
    background-color: rgb(255, 0, 0);
}

.grid:nth-child(7) {
    bottom: calc(var(--std) * (1.25 + 2.5));
    left: 0;
    width: 100%;
    height: 1px;
    background-color: rgb(255, 0, 0);
}

.grid:nth-child(8) {
    bottom: calc(var(--std) * (1.25 + 2.5 + 1.25));
    left: 0;
    width: 100%;
    height: 1px;
    background-color: rgb(255, 0, 0);
}

/* scrollbar */
::-webkit-scrollbar {
    width: calc(var(--std) * 0.75);
    display: none;
}

::-webkit-scrollbar-thumb {
    background: rgb(150, 150, 150);
}

::-webkit-scrollbar-track {
    background: rgb(220, 220, 220);
}

.selective {
    display: none;
}

/* responsive */
@media screen and (max-width: 1200px) {
    #main-header {
        padding: calc(var(--std) * 1.25);
        -webkit-box-pack: start;
            -ms-flex-pack: start;
                justify-content: flex-start;
        gap: calc(var(--std) * (1.25 * 2.0));
    }

    #main-header.is-sticky {
        padding: 0 calc(var(--std) * 1.25);
        -webkit-box-orient: horizontal;
        -webkit-box-direction: normal;
            -ms-flex-direction: row;
                flex-direction: row;
        -webkit-box-align: center;
            -ms-flex-align: center;
                align-items: center;
        -webkit-box-pack: start;
            -ms-flex-pack: start;
                justify-content: flex-start;
        gap: calc(var(--std) * (1.25 * 1.0));
    }

    #main-header > .cont-logo {
        -webkit-box-pack: end;
            -ms-flex-pack: end;
                justify-content: flex-end;
        gap: calc(var(--std) * 1.25);
    }

    #main-header.is-sticky > .cont-logo {
        padding: 0 calc(var(--std) * 1.25);
        -webkit-box-align: center;
            -ms-flex-align: center;
                align-items: center;
        -webkit-box-pack: end;
            -ms-flex-pack: end;
                justify-content: flex-end;
        gap: calc(var(--std) * (1.25 * 0.5));
    }
}

@media screen and (max-width: 1100px) {
    .responsive {
        display: none;
    }
}

@media screen and (max-width: 1000px) {
    #main-header {
        -webkit-box-orient: vertical;
        -webkit-box-direction: normal;
            -ms-flex-direction: column;
                flex-direction: column;
        -webkit-box-align: start;
            -ms-flex-align: start;
                align-items: flex-start;
        -webkit-box-pack: justify;
            -ms-flex-pack: justify;
                justify-content: space-between;
        gap: 0;
        height: calc(var(--std) * (1.25 + 2.5 + 1.25 + 1.25));
    }

    #main-header > .item-main-header {
        height: auto;
    }

    .item-main-header {
        font-size: 1.75rem;
    }

    #main-header > .cont-logo {
        padding-top: calc(var(--std) * 1.25);
        -webkit-box-pack: end;
            -ms-flex-pack: end;
                justify-content: flex-end;
        -webkit-box-align: start;
            -ms-flex-align: start;
                align-items: flex-start;
        gap: calc(var(--std) * (1.25 * 0.5));
    }

    .exhibition {
        width: calc(var(--std) * 6.5);
    }

    .cont-logo > .logo {
        height: calc(var(--std) * 2.00);
    }

    #main-content {
        padding: 0 calc(var(--std) * 1.25);
    }

    #main-footer {
        width: 100%;
        margin: 0;
        margin-bottom: calc(var(--std) * 1.25);
        padding: 0 calc(var(--std) * 1.25);
    }

    .grid:nth-child(7) {
        bottom: calc(var(--std) * (1.25 + 2.5 + 1.25));
    }

    .grid:nth-child(8) {
        bottom: calc(var(--std) * (1.25 + 2.5 + 1.25 + 1.25));
    }

    .grid:nth-child(5) {
        display: none;
    }
    
    .grid:nth-child(6) {
        position: fixed;
        left: 0;
        right: auto;
        top: auto;
        width: 100%;
        height: 1px;
        bottom: calc(var(--std) * (1.25 + (2.5 + 1.25) / 2));
    }
}

@media screen and (max-width: 700px) {
    .section > .content .box .two-column {
        -webkit-box-orient: vertical;
        -webkit-box-direction: normal;
            -ms-flex-direction: column;
                flex-direction: column;
    }

    .section > .content .box .two-column > .item-column:nth-child(1),
    .section > .content .box .two-column > .item-column:nth-child(2) {
        width: 100%;
    }

    section.section:nth-child(2n-1) {
        padding-right: calc(var(--std) * 1.25);
    }

    section.section:nth-child(2n) {
        padding-left: calc(var(--std) * 1.25);
    }

    .section > .content .box {
        padding-right: calc(var(--std) * 1.25);
    }

    .exhibition {
        width: calc(var(--std) * 4.0);
    }

    span.hide {
        display: none;
    }
}

@media screen and (max-width: 600px) {
    #main-header {
        -webkit-box-orient: vertical;
        -webkit-box-direction: normal;
            -ms-flex-direction: column;
                flex-direction: column;
        gap: 0;
        height: calc(var(--std) * (1.25 + 2.5 + 1.25));
        -webkit-box-pack: justify;
            -ms-flex-pack: justify;
                justify-content: space-between;
    }

    #main-header.is-sticky {
        height: calc(var(--std) * 2.00);
    }

    #main-header > .item-main-header {
        height: auto;
    }

    .item-main-header {
        font-size: 1.25rem;
    }

    #main-header.is-sticky > .item-main-header:nth-child(2) {
        display: none;
    }

    #main-header.is-sticky > .item-main-header {
        /* font-size: 0.85rem; */
        font-size: 0.9rem;
    }

    #main-header > .item-main-header:nth-child(1) > a,
    #main-header > .item-main-header:nth-child(2) > a {
        display: inline-block;
        height: auto;
    }

    #main-header.is-sticky .responsive {
        display: inline-block;
    }

    #main-header > .cont-logo {
        gap: calc(var(--std) * (1.25 * 0.25));
    }

    .cont-logo > .logo {
        height: calc(var(--std) * 1.25);
    }

    #main-header.is-sticky > .cont-logo {
        gap: calc(var(--std) * (1.25 * 0.25));
    }

    #main-header.is-sticky > .cont-logo > .logo {
        height: calc(var(--std) * 0.85);
    }

    #main-content {
        margin: calc(var(--std) * (2.5 * 1.25)) 0 calc(var(--std) * (2.5 * 2.5)) 0;
    }

    section.section {
        padding-top: calc(var(--std) * (1.25 * 2.0));
        padding-bottom: calc(var(--std) * (1.25 * 2.0));
        gap: calc(var(--std) * (1.25 * 2.0));
    }

    .section > .content .two-column {
        -webkit-box-orient: vertical;
        -webkit-box-direction: normal;
            -ms-flex-direction: column;
                flex-direction: column;
        margin-bottom: 0;
    }

    .section > .content .two-column > .item-column:nth-child(1),
    .section > .content .two-column > .item-column:nth-child(2) {
        width: 100%;
    }

    .section > .heading {
        font-size: 1.25rem;
    }

    .section > .content p, 
    .section > .content ul.normal li {
        font-size: 1rem;
    }

    .section > .content ul.normal li {
        margin-left: 1rem;
    }

    .section > .content ul li {
        margin-left: 0.75rem;
        font-size: 0.85rem;
    }

    #main-footer {
        -webkit-box-pack: justify;
            -ms-flex-pack: justify;
                justify-content: space-between;
    }

    #main-footer > .left {
        width: auto;
    }

    #main-footer > .right {
        width: auto;
        gap: calc(var(--std) * 0.5);
    }

    #main-footer > .left > a {
        width: calc(var(--std) * 2.0);
        height: calc(var(--std) * 2.0);
        font-size: 0.85rem;
    }

    a.item-right {
        padding: calc(var(--std) * (1.25 * 0.5));
        font-size: 0.85rem;
        width: auto;
        height: calc(var(--std) * 2.0);
    }

    .grid:nth-child(7) {
        bottom: calc(var(--std) * (1.25 + 2.5));
    }

    .grid:nth-child(8) {
        bottom: calc(var(--std) * (1.25 + 2.5 + 1.25));
    }

    .grid:nth-child(6) {
        position: fixed;
        left: 0;
        right: auto;
        top: auto;
        width: 100%;
        height: 1px;
        bottom: calc(var(--std) * (1.25 + (2.5) / 2));
    }
}

@media screen and (max-width: 400px) {
    #main-footer > .left {
        display: none;
    }

    #main-footer > .right {
        width: 100%;
        flex-direction: column;
        gap: calc(var(--std) * (1.25 * 0.5));
    }

    a.item-right {
        /* width: calc((100% - (var(--std) * 0.5) * 2) / 3); */
        font-size: 0.9rem;
        width: 100%;
    }

    a.item-right:last-child {
        font-size: 0.9rem;
        line-height: 1;
    }
}

@media screen and (max-width: 375px) {
    #main-header > .cont-logo {
        padding-top: 0;
        padding-bottom: calc(var(--std) * 1.25);
        -webkit-box-align: end;
            -ms-flex-align: end;
                align-items: flex-end;
    }

    #main-footer > .right {
        width: 100%;
    }

    .cont-logo > .logo {
        height: calc(var(--std) * 1.0);
    }

    #main-footer > .left {
        display: none;
    }

    #main-footer > .right {
        width: 100%;
    }

    a.item-right {
        width: calc((100% - var(--std) * 0.5) / 2);
    }

    #main-header.is-sticky .responsive {
        display: none;
    }
}

@media screen and (max-width: 320px) {
    #main-header > .item-main-header:nth-child(1) {
        width: 100%;
    }
}