/* ==========================================================================
   mosoon.org — 모순 / contradiction
   Brutalist high-contrast duotone with adversarial split layout.
   ========================================================================== */

:root {
    --c-thesis: #0a0a0a;       /* Thesis Black */
    --c-anti: #f5f5f5;         /* Antithesis White */
    --c-conflict: #e82c2c;     /* Conflict Red */
    --c-dark-text: #1a1a1a;    /* Dark Text */
    --c-light-text: #e0e0e0;   /* Light Text */
    --c-spine: #4a4a4a;        /* Neutral Gray (center line) */
    --c-pure: #ffffff;         /* Pure White */

    --f-display: "Bebas Neue", "Noto Sans KR", sans-serif;
    --f-body: "Noto Sans KR", system-ui, sans-serif;
    --f-mono: "Red Hat Mono", "Courier New", monospace;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    width: 100%;
    overflow-x: hidden;
}

body {
    font-family: var(--f-body);
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--c-dark-text);
    background: var(--c-anti);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
}

ul, ol {
    list-style: none;
}

/* ==========================================================================
   Center Spine — runs the full page height
   ========================================================================== */
.spine {
    position: fixed;
    left: 50%;
    top: 0;
    width: 1px;
    height: 100vh;
    background: var(--c-spine);
    transform: translateX(-0.5px);
    z-index: 50;
    pointer-events: none;
    transition: background 0.4s ease, border 0.4s ease;
}

.spine.is-collide {
    background: transparent;
    border-left: 1px dashed var(--c-conflict);
    width: 0;
}

.spine.is-broken {
    background: linear-gradient(
        to bottom,
        var(--c-spine) 0,
        var(--c-spine) 25%,
        transparent 25%,
        transparent 35%,
        var(--c-spine) 35%,
        var(--c-spine) 65%,
        transparent 65%,
        transparent 78%,
        var(--c-spine) 78%
    );
}

/* ==========================================================================
   Topbar (split top)
   ========================================================================== */
.topbar {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    z-index: 60;
}

.topbar__left,
.topbar__right {
    padding: 18px 32px;
    font-family: var(--f-mono);
    font-size: 0.75rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.topbar__left {
    background: var(--c-thesis);
    color: var(--c-light-text);
}

.topbar__right {
    background: var(--c-anti);
    color: var(--c-dark-text);
    text-align: right;
}

.brand {
    font-family: var(--f-display);
    font-size: 1.05rem;
    letter-spacing: 0.12em;
}

.brand__dot {
    color: var(--c-conflict);
}

.brand--inverse {
    color: inherit;
}

/* ==========================================================================
   Nav split
   ========================================================================== */
.nav {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    border-top: 1px solid var(--c-spine);
    border-bottom: 1px solid var(--c-spine);
}

.nav__half {
    display: flex;
    align-items: center;
    gap: 28px;
    padding: 14px 32px;
}

.nav__half--dark {
    background: var(--c-thesis);
    color: var(--c-light-text);
}

.nav__half--light {
    background: var(--c-anti);
    color: var(--c-dark-text);
    justify-content: flex-end;
}

.nav__link {
    font-family: var(--f-mono);
    font-size: 0.78rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    transition: color 0.2s ease, transform 0.2s ease;
    position: relative;
    padding: 4px 0;
}

.nav__link::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    height: 1px;
    width: 0;
    background: var(--c-conflict);
    transition: width 0.25s ease;
}

.nav__link:hover {
    color: var(--c-conflict);
}

.nav__link:hover::after {
    width: 100%;
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: calc(100vh - 100px);
}

.hero__side {
    display: flex;
    align-items: center;
    padding: 64px clamp(24px, 5vw, 96px);
    overflow: hidden;
    position: relative;
}

.hero__side--dark {
    background: var(--c-thesis);
    color: var(--c-light-text);
}

.hero__side--light {
    background: var(--c-anti);
    color: var(--c-dark-text);
}

.hero__inner {
    max-width: 540px;
}

.hero__side--light .hero__inner {
    margin-left: auto;
    text-align: left;
}

.hero__headline {
    font-family: var(--f-display);
    font-weight: 400;
    font-size: clamp(2.5rem, 6vw, 5rem);
    line-height: 0.95;
    letter-spacing: 0.01em;
    text-transform: uppercase;
    margin: 22px 0 26px;
    color: var(--c-pure);
}

.hero__headline--inverse {
    color: var(--c-thesis);
}

.hero__sub {
    font-size: 0.95rem;
    line-height: 1.7;
    max-width: 440px;
    color: var(--c-light-text);
    margin-bottom: 36px;
}

.hero__sub--dark {
    color: var(--c-dark-text);
}

.hero__meta {
    display: flex;
    gap: 18px;
    flex-wrap: wrap;
}

.meta-tag {
    font-family: var(--f-mono);
    font-size: 0.72rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    padding: 6px 10px;
    border: 1px solid var(--c-spine);
    color: var(--c-light-text);
}

.meta-tag--dark {
    color: var(--c-dark-text);
    border-color: var(--c-spine);
}

/* ==========================================================================
   Paradox labels & section IDs
   ========================================================================== */
.paradox-label {
    display: inline-block;
    font-family: var(--f-mono);
    font-weight: 500;
    font-size: 0.8rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    padding: 4px 0;
    border-bottom: 1px solid currentColor;
}

.paradox-label--light {
    color: var(--c-light-text);
}

.paradox-label--dark {
    color: var(--c-dark-text);
}

.paradox-id {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--c-anti);
    color: var(--c-dark-text);
    border: 1px solid var(--c-spine);
    padding: 4px 14px;
    font-family: var(--f-mono);
    font-size: 0.78rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    z-index: 10;
    white-space: nowrap;
}

.paradox-id--red {
    background: var(--c-conflict);
    color: var(--c-pure);
    border-color: var(--c-conflict);
}

/* ==========================================================================
   Marquee
   ========================================================================== */
.marquee {
    background: var(--c-thesis);
    color: var(--c-conflict);
    border-top: 1px solid var(--c-spine);
    border-bottom: 1px solid var(--c-spine);
    overflow: hidden;
    padding: 14px 0;
    position: relative;
    z-index: 5;
}

.marquee__track {
    display: inline-flex;
    white-space: nowrap;
    font-family: var(--f-display);
    font-size: 1.2rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    will-change: transform;
}

.marquee__track span {
    padding: 0 4px;
}

/* ==========================================================================
   Generic split section
   ========================================================================== */
.split {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 80vh;
}

.split__side {
    padding: 96px clamp(24px, 5vw, 96px);
    position: relative;
    overflow: visible;
}

.split__side--dark {
    background: var(--c-thesis);
    color: var(--c-light-text);
}

.split__side--light {
    background: var(--c-anti);
    color: var(--c-dark-text);
}

.split__title {
    font-family: var(--f-display);
    font-weight: 400;
    font-size: clamp(2rem, 4.5vw, 3.6rem);
    line-height: 0.95;
    letter-spacing: 0.01em;
    text-transform: uppercase;
    color: var(--c-pure);
    margin: 22px 0 24px;
}

.split__title--inverse {
    color: var(--c-thesis);
}

.split__body {
    max-width: 460px;
    color: var(--c-light-text);
    margin-bottom: 28px;
}

.split__body--dark {
    color: var(--c-dark-text);
}

.split__list {
    border-top: 1px solid var(--c-spine);
    padding-top: 16px;
    max-width: 460px;
}

.split__list li {
    font-family: var(--f-mono);
    font-size: 0.78rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 8px 0;
    border-bottom: 1px dashed var(--c-spine);
}

.split__list--light li {
    color: var(--c-light-text);
}

.split__list--dark li {
    color: var(--c-dark-text);
}

/* Reverse split (light on left, dark on right) */
.split--reverse .split__side--light {
    order: 1;
}

.split--reverse .split__side--dark {
    order: 2;
}

/* ==========================================================================
   Collision sections — content invades opposite half
   ========================================================================== */
.split--collide {
    background: var(--c-conflict);
}

.collide-left {
    margin-right: -40px;
    z-index: 3;
    box-shadow: 6px 0 0 0 var(--c-conflict);
    border-right: 2px solid var(--c-conflict);
}

.collide-right {
    margin-left: -40px;
    z-index: 3;
    box-shadow: -6px 0 0 0 var(--c-conflict);
    border-left: 2px solid var(--c-conflict);
}

.collision-tag {
    margin-top: 28px;
    display: inline-block;
    font-family: var(--f-mono);
    font-size: 0.7rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    padding: 6px 10px;
    color: var(--c-conflict);
    border: 1px solid var(--c-conflict);
}

.collision-tag--dark {
    color: var(--c-conflict);
}

/* ==========================================================================
   Quote blocks
   ========================================================================== */
.quote-block {
    margin-top: 28px;
    padding: 18px 22px;
    border-left: 2px solid var(--c-conflict);
    max-width: 460px;
    background: rgba(232, 44, 44, 0.06);
}

.quote-block--dark {
    background: rgba(232, 44, 44, 0.05);
}

.quote-mark {
    font-family: var(--f-display);
    font-size: 2rem;
    color: var(--c-conflict);
    line-height: 0.6;
    display: block;
}

.quote-mark--light {
    color: var(--c-conflict);
}

.quote-text {
    display: block;
    font-style: italic;
    margin: 6px 0 8px;
    font-size: 1.05rem;
    color: var(--c-light-text);
}

.quote-text--light {
    color: var(--c-light-text);
}

.quote-block--dark .quote-text {
    color: var(--c-dark-text);
}

.quote-author {
    font-family: var(--f-mono);
    font-size: 0.72rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--c-conflict);
    display: block;
}

.quote-author--light {
    color: var(--c-conflict);
}

/* ==========================================================================
   Archive
   ========================================================================== */
.archive {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
}

.archive__half {
    padding: 96px clamp(24px, 5vw, 96px);
}

.archive__half--dark {
    background: var(--c-thesis);
    color: var(--c-light-text);
}

.archive__half--light {
    background: var(--c-anti);
    color: var(--c-dark-text);
}

.archive__heading {
    font-family: var(--f-display);
    font-weight: 400;
    font-size: clamp(1.6rem, 3vw, 2.4rem);
    letter-spacing: 0.04em;
    text-transform: uppercase;
    margin-bottom: 32px;
    color: var(--c-pure);
}

.archive__heading--dark {
    color: var(--c-thesis);
}

.archive__list li {
    display: grid;
    grid-template-columns: 60px 1fr 50px;
    gap: 16px;
    padding: 14px 0;
    border-bottom: 1px solid var(--c-spine);
    font-family: var(--f-mono);
    font-size: 0.85rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    transition: color 0.2s ease, transform 0.25s ease, padding-left 0.25s ease;
    cursor: default;
}

.archive__list li:hover {
    color: var(--c-conflict);
    padding-left: 8px;
}

.archive__num {
    color: var(--c-conflict);
    font-weight: 600;
}

.archive__title {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.archive__year {
    text-align: right;
    opacity: 0.7;
}

/* ==========================================================================
   Manifesto
   ========================================================================== */
.manifesto {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    border-top: 1px solid var(--c-spine);
    border-bottom: 1px solid var(--c-spine);
}

.manifesto__half {
    padding: 96px clamp(24px, 5vw, 96px);
}

.manifesto__half--dark {
    background: var(--c-thesis);
    color: var(--c-light-text);
}

.manifesto__half--light {
    background: var(--c-anti);
    color: var(--c-dark-text);
}

.manifesto__heading {
    font-family: var(--f-display);
    font-weight: 400;
    font-size: clamp(1.8rem, 3.4vw, 2.8rem);
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--c-pure);
    margin-bottom: 22px;
    border-bottom: 2px solid var(--c-conflict);
    padding-bottom: 10px;
    display: inline-block;
}

.manifesto__heading--dark {
    color: var(--c-thesis);
}

.manifesto__text {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--c-light-text);
    max-width: 440px;
    margin-bottom: 22px;
}

.manifesto__text--dark {
    color: var(--c-dark-text);
}

.manifesto__line {
    font-family: var(--f-mono);
    font-size: 0.78rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--c-conflict);
}

.manifesto__line--dark {
    color: var(--c-conflict);
}

/* ==========================================================================
   Paradox card (interactive flip)
   ========================================================================== */
.paradox-card-wrap {
    position: relative;
    background: var(--c-anti);
    padding: 96px clamp(24px, 5vw, 96px);
    display: flex;
    justify-content: center;
    align-items: center;
}

.paradox-card-wrap::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    width: 50%;
    height: 100%;
    background: var(--c-thesis);
    z-index: 0;
}

.paradox-card {
    position: relative;
    width: min(90vw, 640px);
    aspect-ratio: 16 / 9;
    cursor: pointer;
    perspective: 1200px;
    z-index: 2;
}

.paradox-card__face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 48px;
    transition: transform 0.7s cubic-bezier(0.7, 0.0, 0.2, 1);
    transform-style: preserve-3d;
}

.paradox-card__face--front {
    background: var(--c-thesis);
    color: var(--c-light-text);
    border: 1px solid var(--c-conflict);
    transform: rotateY(0deg);
}

.paradox-card__face--back {
    background: var(--c-anti);
    color: var(--c-dark-text);
    border: 1px solid var(--c-conflict);
    transform: rotateY(180deg);
}

.paradox-card[data-state="antithesis"] .paradox-card__face--front {
    transform: rotateY(-180deg);
}

.paradox-card[data-state="antithesis"] .paradox-card__face--back {
    transform: rotateY(0deg);
}

.paradox-card__heading {
    font-family: var(--f-display);
    font-weight: 400;
    font-size: clamp(1.6rem, 4vw, 3rem);
    line-height: 0.95;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    text-align: center;
    color: var(--c-pure);
    margin: 18px 0;
}

.paradox-card__heading--dark {
    color: var(--c-thesis);
}

.paradox-card__hint {
    font-family: var(--f-mono);
    font-size: 0.75rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--c-conflict);
}

.paradox-card__hint--dark {
    color: var(--c-conflict);
}

/* ==========================================================================
   Contact
   ========================================================================== */
.contact {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 70vh;
}

.contact__half {
    padding: 96px clamp(24px, 5vw, 96px);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.contact__half--dark {
    background: var(--c-thesis);
    color: var(--c-light-text);
}

.contact__half--light {
    background: var(--c-anti);
    color: var(--c-dark-text);
}

.contact__heading {
    font-family: var(--f-display);
    font-weight: 400;
    font-size: clamp(2rem, 4.5vw, 3.6rem);
    line-height: 0.95;
    letter-spacing: 0.01em;
    text-transform: uppercase;
    color: var(--c-pure);
    margin: 22px 0 20px;
}

.contact__heading--inverse {
    color: var(--c-thesis);
}

.contact__body {
    max-width: 440px;
    color: var(--c-light-text);
    margin-bottom: 28px;
}

.contact__body--dark {
    color: var(--c-dark-text);
}

.contact__link {
    font-family: var(--f-mono);
    font-size: 0.95rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--c-conflict);
    border-bottom: 1px solid var(--c-conflict);
    padding-bottom: 4px;
    display: inline-block;
    width: fit-content;
    transition: transform 0.25s ease, letter-spacing 0.25s ease;
}

.contact__link:hover {
    transform: translateX(8px);
    letter-spacing: 0.22em;
}

.contact__link--dark {
    color: var(--c-conflict);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    border-top: 1px solid var(--c-spine);
}

.footer__half {
    padding: 24px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.footer__half--dark {
    background: var(--c-thesis);
    color: var(--c-light-text);
}

.footer__half--light {
    background: var(--c-anti);
    color: var(--c-dark-text);
    justify-content: space-between;
}

.footer__line {
    font-family: var(--f-mono);
    font-size: 0.72rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.footer__line--mono {
    color: var(--c-conflict);
}

.footer__line--dark {
    color: var(--c-dark-text);
}

.footer__line--mono.footer__line--dark {
    color: var(--c-conflict);
}

/* ==========================================================================
   Reveal animation states
   ========================================================================== */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.reveal--left {
    transform: translateX(-30px);
}

.reveal--right {
    transform: translateX(30px);
}

.reveal--left.is-visible,
.reveal--right.is-visible {
    transform: translateX(0);
}

/* Glitch flicker on collision section titles */
@keyframes flicker {
    0%, 100% { opacity: 1; transform: translateX(0); }
    20% { opacity: 0.85; transform: translateX(-1px); }
    50% { opacity: 1; transform: translateX(1px); }
    80% { opacity: 0.95; transform: translateX(-0.5px); }
}

.split--collide .split__title {
    animation: flicker 5s infinite;
}

/* ==========================================================================
   Responsive — collapse split below 800px while keeping duotone duality
   ========================================================================== */
@media (max-width: 800px) {
    .spine { display: none; }

    .topbar,
    .nav,
    .hero,
    .split,
    .archive,
    .manifesto,
    .contact,
    .footer {
        grid-template-columns: 1fr;
    }

    .nav__half--light { justify-content: flex-start; }

    .hero {
        min-height: auto;
    }

    .hero__side,
    .split__side,
    .archive__half,
    .manifesto__half,
    .contact__half {
        padding: 64px 24px;
    }

    .split--reverse .split__side--light { order: 0; }
    .split--reverse .split__side--dark { order: 0; }

    .collide-left,
    .collide-right {
        margin: 0;
        box-shadow: none;
        border: none;
    }

    .paradox-card-wrap::before {
        width: 100%;
        height: 50%;
    }

    .paradox-id {
        position: static;
        transform: none;
        display: inline-block;
        margin: 24px;
    }

    .footer__half {
        justify-content: flex-start;
    }
}