:root {
    --content-max-width: 1280px;
    --content-padding-x: clamp(20px, 4vw, 56px);
    --content-font-size: clamp(0.98rem, 0.76rem + 0.78vw, 1.55rem);
    --content-line-height: 1.78;

    --h1-font-size: clamp(2.05rem, 1.05rem + 4.35vw, 5rem);
    --h2-font-size: clamp(1.55rem, 1.02rem + 2.2vw, 3rem);
    --quote-font-size: clamp(1rem, 0.78rem + 0.86vw, 1.65rem);

    --page-scale: 1;

    --page-background-color: #000000;
    --page-background-image: url("/rainbowbg.png");
    --page-background-size: cover;
    --page-background-position: center;
    --page-background-repeat: no-repeat;

    --video-fit: cover;
    --video-position: center center;
    --background-overlay: transparent;
    --video-scale: 1;

    --h1-divider-thickness: 2px;
    --h1-divider-style: solid;
    --h1-divider-color: rgba(255, 255, 255, 0.4);
    --h1-divider-padding: clamp(18px, 3.2vw, 30px);

    /*
     * 기본 텍스트 색상.
     *
     * 기존:
     * --page-text-color: var(--page-text-color);
     *
     * 는 자기 자신을 참조하는 순환값이므로 제거한다.
     */
    --page-text-color: #ffffff;

    /*
     * 기본적으로 blending은 항상 켜져 있다.
     *
     * 사용자가 별도의 "blending 끄기" 옵션을 활성화했을 때에만
     * 아래 값이 normal로 변경된다.
     */
    --content-blend-mode: difference;
}


/* =========================================================
   Document
   ========================================================= */

html {
    min-height: 100%;
    background-color: #000000;
    scroll-behavior: smooth;
}

body {
    position: relative;
    z-index: 0;
    isolation: isolate;

    margin: 0;
    padding: 0 0 clamp(80px, 10vh, 140px);

    min-height: 100%;
    overflow-x: hidden;

    font-family: "Asta Sans", sans-serif;
    font-weight: 400;

    color: var(--page-text-color);
    background: transparent;
}

.page-content {
    position: relative;
    width: 100%;
}


/* =========================================================
   Background
   ========================================================= */

.site-background {
    position: fixed;
    inset: 0;
    z-index: 0;

    width: 100vw;
    height: 100vh;
    height: 100lvh;

    overflow: hidden;
    pointer-events: none;

    background-color: var(--page-background-color);
    background-image: var(--page-background-image);
    background-size: var(--page-background-size);
    background-position: var(--page-background-position);
    background-repeat: var(--page-background-repeat);
}

.site-background::after {
    content: "";

    position: absolute;
    inset: 0;
    z-index: 1;

    background: var(--background-overlay, transparent);

    pointer-events: none;
}

.site-background-video {
    background-image: none;
}

.background-video {
    position: absolute;
    inset: 0;
    z-index: 0;

    display: block;

    width: 100%;
    height: 100%;

    object-fit: var(--video-fit, cover);
    object-position: var(--video-position, center center);

    transform: scale(var(--video-scale, 1));

    pointer-events: none;
}

@supports not (height: 100lvh) {
    .site-background {
        height: 100vh;
    }
}


/* =========================================================
   Mobile rotate notice
   ========================================================= */

.rotate-notice {
    position: fixed;
    inset: 0;
    z-index: 100;

    display: none;

    min-height: 100vh;
    min-height: 100svh;

    padding: 24px;
    box-sizing: border-box;

    place-items: center;

    text-align: center;

    color: #ffffff;
    background: #000000;
}

.rotate-notice__inner {
    max-width: 340px;

    font-size: clamp(1rem, 0.92rem + 0.4vw, 1.15rem);
    line-height: 1.7;

    opacity: 0.96;
}

.rotate-notice__icon {
    display: block;

    margin-bottom: 16px;

    font-size: 2rem;
    line-height: 1;
}


/* =========================================================
   Main content
   ========================================================= */

.site-content {
    position: relative;
}

.hero-section {
    position: relative;

    height: 100vh;
    height: 100svh;

    overflow: hidden;
}

#pqr-negation-canvas {
    position: absolute;
    inset: 0;

    display: block;

    width: 100%;
    height: 100%;
}


/* =========================================================
   Markdown
   ========================================================= */

.markdown-body {
    position: relative;

    max-width: var(--content-max-width);

    margin: 0 auto;
    padding: 0 var(--content-padding-x);

    box-sizing: border-box;

    text-align: left;

    font-size: var(--content-font-size);
    font-size: calc(var(--content-font-size) * var(--page-scale));

    line-height: var(--content-line-height);

    color: var(--page-text-color);

    /*
     * 기본 상태는 difference.
     *
     * var() fallback에 의존하지 않고 :root에서 명시적으로
     * difference를 정의해 둔다.
     */
    mix-blend-mode: var(--content-blend-mode);
}

.markdown-body h1 {
    margin-top: 0;
    margin-bottom: clamp(24px, 3vw, 44px);

    padding-bottom: var(--h1-divider-padding);

    border-bottom:
        var(--h1-divider-thickness)
        var(--h1-divider-style)
        var(--h1-divider-color);

    font-size: var(--h1-font-size);
    font-size: calc(var(--h1-font-size) * var(--page-scale));

    font-weight: 700;

    letter-spacing: -0.03em;
    line-height: 1.08;
}

.markdown-body h1.no-divider,
.hide-h1-divider .markdown-body h1 {
    padding-bottom: 0;
    border-bottom: none;
}

.section-divider {
    width: var(--divider-width, 100%);

    margin:
        var(--divider-margin-top, 24px)
        auto
        var(--divider-margin-bottom, 24px);

    box-sizing: border-box;

    border: 0;

    border-top:
        var(--divider-thickness, var(--h1-divider-thickness))
        var(--divider-style, var(--h1-divider-style))
        var(--divider-color, var(--h1-divider-color));
}

.markdown-body h2 {
    margin-top: clamp(40px, 6vw, 72px);
    margin-bottom: clamp(18px, 2.4vw, 30px);

    font-size: var(--h2-font-size);
    font-size: calc(var(--h2-font-size) * var(--page-scale));

    line-height: 1.18;
}

.markdown-body p {
    margin-top: 0;
    margin-bottom: clamp(18px, 2.5vw, 30px);

    font-size: 1em;

    opacity: 0.95;
}

.markdown-body blockquote {
    margin: clamp(28px, 4vw, 48px) 0;

    padding:
        clamp(16px, 2vw, 24px)
        clamp(20px, 4vw, 40px);

    border-left:
        clamp(4px, 0.7vw, 6px)
        solid
        var(--page-text-color);

    background: rgba(255, 255, 255, 0.08);

    font-size: var(--quote-font-size);
    font-size: calc(var(--quote-font-size) * var(--page-scale));

    line-height: 1.65;
}


/* =========================================================
   Page header
   ========================================================= */

.page-header {
    display: flex;
    align-items: flex-end;

    min-height: clamp(260px, 42svh, 520px);

    padding:
        clamp(72px, 12vh, 150px)
        0
        clamp(42px, 7vh, 84px);

    box-sizing: border-box;
}

.page-header .markdown-body {
    width: 100%;
}

.page-kicker {
    margin: 0 0 0.8rem;

    font-family: "Elms Sans", "Asta Sans", sans-serif;

    font-size: 0.72em;
    font-weight: 650;

    letter-spacing: 0.14em;
    text-transform: uppercase;

    opacity: 0.72;
}

.page-description {
    max-width: 42em;

    margin-bottom: 0;
}


/* =========================================================
   Navigation
   ========================================================= */

.site-nav {
    position: fixed;

    top: 0;
    right: 0;
    left: 0;

    z-index: 5;

    display: flex;

    align-items: center;
    justify-content: space-between;

    gap: 24px;

    padding:
        18px
        var(--content-padding-x);

    box-sizing: border-box;

    color: var(--page-text-color);

    /*
     * navigation도 콘텐츠와 동일하게
     * 기본적으로 difference blending.
     */
    mix-blend-mode: var(--content-blend-mode);
}

.site-nav a {
    color: inherit;
    text-decoration: none;
}

.site-nav__brand {
    font-family: "Elms Sans", "Asta Sans", sans-serif;

    font-weight: 750;

    letter-spacing: -0.03em;
}

.site-nav__links {
    display: flex;

    flex-wrap: wrap;
    justify-content: flex-end;

    gap: 10px 22px;

    font-size: 0.88rem;
}

.site-nav a:hover,
.site-nav a:focus-visible {
    text-decoration: underline;

    text-underline-offset: 0.28em;
}


/* =========================================================
   Tables / boxes
   ========================================================= */

.box {
    width: 100%;

    border-collapse: collapse;
}

.box td {
    padding: 16px 24px;

    text-align: center;
    vertical-align: middle;

    border: 3px solid currentColor;
}


/* =========================================================
   Images
   ========================================================= */

.content-image {
    display: block;

    width: var(--image-width, 100%);
    max-width: 100%;

    height: auto;

    margin:
        var(--image-margin-y, clamp(24px, 4vw, 48px))
        auto;

    border-radius: var(--image-radius, 0);
}


/* =========================================================
   Paragraph helpers
   ========================================================= */

.indent-paragraph {
    text-indent: var(--line-indent, 2em);
}

.indented-lines {
    margin-top: 0;
    margin-bottom: clamp(18px, 2.5vw, 30px);
}

.indented-lines > span {
    display: block;

    text-indent: var(--line-indent, 2em);
}

.indented-lines > .blank-line {
    height: var(--blank-line-height, 1em);

    text-indent: 0;
}

.quote-source {
    display: block;

    margin-top: 1em;

    text-align: right;
    font-style: italic;

    opacity: 0.8;
}


/* =========================================================
   Lists
   ========================================================= */

.markdown-body ul {
    margin-top: 0;
    margin-bottom: 0;

    padding-left: 2em;
}

.markdown-body ul li {
    margin: 0;
}

.markdown-body p:has(+ ul) {
    margin-bottom: 0;
}

.markdown-body li.gap-after {
    margin-bottom: 2em;
}


/* =========================================================
   Blending
   ========================================================= */

/*
 * 기본 상태에서는 별도의 class가 없어도
 * --content-blend-mode = difference 이므로 blending이 켜져 있다.
 *
 * blending OFF 옵션이 실제로 활성화될 때에는
 * body 또는 상위 container에:
 *
 *     class="blend-disabled"
 *
 * 를 추가하면 된다.
 */

.blend-disabled {
    --content-blend-mode: normal;
}


/*
 * 특정 요소를 blend에서 제외할 때.
 *
 * 주의:
 * mix-blend-mode가 적용된 부모 내부에서는 부모 전체가 마지막에
 * 합성되므로, 깊이 중첩된 .no-blend 요소까지 완전히 분리해야 하는
 * 경우에는 해당 요소를 .markdown-body 바깥의 독립 stacking context로
 * 두는 것이 가장 확실하다.
 */
.no-blend {
    mix-blend-mode: normal !important;
}


/* =========================================================
   Links
   ========================================================= */

.markdown-body a,
.markdown-body a:visited {
    color: #4da3ff;
}

.markdown-body a:hover,
.markdown-body a:focus-visible {
    color: #80bdff;
}

.markdown-body a:active {
    color: #4da3ff;
}


/* =========================================================
   Inline link button
   ========================================================= */

.inline-link-button {
    display: inline-flex;

    align-items: center;
    justify-content: center;

    width: max-content;
    max-width: 100%;

    min-height: 2.4em;

    margin: 0.15em 0.2em;

    padding: 0.35em 0.9em;

    box-sizing: border-box;

    border:
        2px
        solid
        var(--link-button-border, #ffffff);

    border-radius:
        var(--link-button-radius, 0);

    color:
        var(--link-button-text, #ffffff);

    background:
        var(--link-button-background, #333333);

    font-family: inherit;

    font-size:
        var(--link-button-font-size, 0.95em);

    font-weight: 700;

    line-height: 1.3;

    text-align: center;
    text-decoration: none;

    vertical-align: middle;

    white-space: normal;
    overflow-wrap: anywhere;

    cursor: pointer;

    transition:
        transform 0.16s ease,
        filter 0.16s ease,
        box-shadow 0.16s ease;
}

.markdown-body .inline-link-button,
.markdown-body .inline-link-button:visited {
    color:
        var(--link-button-text, #ffffff);

    text-decoration: none;
}

.markdown-body .inline-link-button:hover,
.markdown-body .inline-link-button:focus-visible {
    color:
        var(--link-button-text, #ffffff);

    filter: brightness(1.14);

    transform: translateY(-2px);

    box-shadow:
        0 4px 0
        rgba(0, 0, 0, 0.3);
}

.markdown-body .inline-link-button:active {
    color:
        var(--link-button-text, #ffffff);

    transform: translateY(0);

    box-shadow: none;
}


/* =========================================================
   Mobile portrait
   ========================================================= */

@media (max-width: 480px) and (orientation: portrait) {
    :root {
        --content-font-size:
            clamp(0.90rem, 0.84rem + 0.35vw, 0.98rem);

        --h1-font-size:
            clamp(1.78rem, 1.44rem + 1.70vw, 2.05rem);

        --h2-font-size:
            clamp(1.35rem, 1.16rem + 0.95vw, 1.55rem);

        --quote-font-size:
            clamp(0.92rem, 0.85rem + 0.35vw, 1rem);
    }

    .markdown-body {
        --content-line-height: 1.70;
    }

    .markdown-body h1 {
        letter-spacing: -0.02em;
    }
}


/* =========================================================
   Mobile portrait rotate lock
   ========================================================= */

@media
    (hover: none)
    and (pointer: coarse)
    and (orientation: portrait)
    and (max-width: 640px) {

    html,
    body {
        background: #000000;
    }

    body {
        padding-bottom: 0;

        overflow: hidden;
    }

    .site-background,
    .site-content {
        display: none;
    }

    .rotate-notice {
        display: grid;
    }
}


/* =========================================================
   Mobile landscape
   ========================================================= */

@media
    (hover: none)
    and (pointer: coarse)
    and (orientation: landscape)
    and (max-height: 520px) {

    :root {
        --content-padding-x:
            clamp(40px, 7vw, 72px);

        --content-font-size:
            clamp(0.98rem, 0.70rem + 0.75vw, 1.22rem);

        --h1-font-size:
            clamp(2.05rem, 0.95rem + 3.8vw, 3.8rem);

        --h2-font-size:
            clamp(1.55rem, 0.92rem + 2vw, 2.45rem);

        --quote-font-size:
            clamp(1rem, 0.72rem + 0.78vw, 1.25rem);
    }

    body {
        padding-bottom:
            clamp(48px, 8svh, 96px);
    }

    .hero-section {
        height: 118vh;
        height: 118svh;

        min-height: 420px;
    }

    .markdown-body {
        max-width:
            min(1280px, 88vw);
    }
}