/* ============================================
   mujun.study - Editorial Magazine Spread
   ============================================ */
:root {
    --bg-light: #f0ece4;
    --bg-dark: #1c1c1e;
    --text-primary: #2a2a2a;
    --text-secondary: #7a7a7a;
    --text-on-dark: #d9d3c7;
    --accent: #8b4f3a;
    --accent-secondary: #4a5a5c;
    --collage-overlay: #c8c0b4;
    --dark-accent: #3d2e24;
    --rule-color: #c8c0b4;
    --faint-line: #5c5c5c;
}
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
    background: var(--bg-light);
    color: var(--text-primary);
    font-family: 'Source Serif 4', serif;
    font-weight: 400;
    font-size: clamp(0.9375rem, 1.1vw, 1.125rem);
    line-height: 1.72;
    text-rendering: optimizeLegibility;
    font-feature-settings: 'kern' 1, 'liga' 1, 'onum' 1;
    overflow-x: hidden;
    transition: background-color 800ms ease;
}

/* --- Spine Navigation --- */
.spine {
    position: fixed;
    left: 2rem;
    top: 0;
    bottom: 0;
    z-index: 100;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2.5rem;
}
.spine-line {
    position: absolute;
    top: 10%;
    bottom: 10%;
    width: 1px;
    background: var(--faint-line);
    z-index: -1;
}
.spine-marker {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.625rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--collage-overlay);
    cursor: pointer;
    transition: color 0.4s ease, opacity 0.4s ease;
    writing-mode: horizontal-tb;
}
.spine-marker.active {
    color: var(--accent);
}

/* --- Spread Base --- */
.spread {
    position: relative;
    min-height: 100vh;
    padding: clamp(6rem, 12vh, 10rem) 0;
    overflow: hidden;
}
.spread[data-bg="dark"] {
    background: var(--bg-dark);
    color: var(--text-on-dark);
}
.spread[data-bg="dark"] .spread-heading {
    color: var(--bg-light);
}
.spread[data-bg="dark"] .head-rule {
    border-color: rgba(200, 192, 180, 0.3);
}
.spread[data-bg="dark"] .body-text {
    color: var(--text-on-dark);
}
.spread[data-bg="dark"]::before {
    content: '';
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(90deg, transparent, transparent 47px, rgba(255,255,255,0.02) 47px, rgba(255,255,255,0.02) 48px);
    pointer-events: none;
}

/* --- Spread Grid --- */
.spread-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    column-gap: clamp(0.75rem, 1.5vw, 1.5rem);
    max-width: 100%;
    padding: 0 clamp(3rem, 5vw, 6rem);
    position: relative;
}

/* --- Spread Number Ghost --- */
.spread-number {
    position: absolute;
    top: 2rem;
    right: 3rem;
    font-family: 'IBM Plex Mono', monospace;
    font-size: clamp(4rem, 8vw, 7rem);
    color: rgba(139, 79, 58, 0.08);
    line-height: 1;
    pointer-events: none;
    transform: scale(1.1);
    transition: transform 2000ms ease;
}
.spread.visible .spread-number {
    transform: scale(1);
}

/* --- Head Rule --- */
.head-rule {
    border-top: 0.5px solid var(--rule-color);
    margin-bottom: 2rem;
    width: 100%;
}

/* --- Typography --- */
.spread-heading {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    letter-spacing: -0.03em;
    line-height: 0.95;
    color: var(--bg-dark);
    text-shadow: 1px 1px 0px rgba(0,0,0,0.06);
    margin-bottom: 1.5rem;
}
.body-text {
    font-family: 'Source Serif 4', serif;
    font-size: clamp(0.9375rem, 1.1vw, 1.125rem);
    line-height: 1.72;
    margin-bottom: 1.5em;
    color: var(--text-primary);
}
.dropcap {
    font-family: 'Playfair Display', serif;
    font-size: 3.5em;
    float: left;
    line-height: 0.8;
    margin: 0 0.5rem 0 -0.1rem;
    color: var(--accent);
}

/* --- Pull Quotes --- */
.pullquote {
    font-family: 'Playfair Display', serif;
    font-style: italic;
    font-size: clamp(1.2rem, 2vw, 1.6rem);
    line-height: 1.5;
    color: var(--text-primary);
    margin: 2rem 0;
    position: relative;
    padding-left: 2rem;
}
.pullquote-mark {
    font-family: 'Playfair Display', serif;
    font-size: 4em;
    color: var(--accent);
    opacity: 0.4;
    position: absolute;
    left: -0.5rem;
    top: -0.5rem;
    line-height: 1;
}
.pullquote-cite {
    display: block;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.75rem;
    font-style: normal;
    letter-spacing: 0.08em;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}
.pullquote--inline {
    margin: 2rem 0;
    font-size: clamp(1.3rem, 2.5vw, 2rem);
    text-align: center;
    padding-left: 0;
}
.pullquote--inline .pullquote-mark {
    position: relative;
    left: auto;
    top: auto;
}
[data-bg="dark"] .pullquote {
    color: var(--text-on-dark);
}

/* --- Folio --- */
.folio {
    position: absolute;
    bottom: 2rem;
    right: clamp(3rem, 5vw, 6rem);
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.625rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--collage-overlay);
}

/* --- Collage Fragments --- */
.collage-frag {
    position: relative;
    border: 1px solid var(--collage-overlay);
    box-shadow: 4px 6px 20px rgba(0,0,0,0.15);
    overflow: hidden;
    opacity: 0;
    transition: opacity 800ms cubic-bezier(0.25, 0.1, 0.25, 1), transform 800ms cubic-bezier(0.25, 0.1, 0.25, 1);
}
.collage-frag.visible {
    opacity: 1;
}
.collage-frag::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at center, transparent 40%, rgba(0,0,0,0.3) 100%);
    pointer-events: none;
}
/* Fragment variations */
.frag-a {
    width: 280px; height: 200px;
    background: linear-gradient(175deg, #1c1c1e 0%, #4a5a5c 35%, #c8c0b4 70%, #f0ece4 100%);
    background-size: 150% 150%;
    transform: rotate(-1.5deg) translateY(2rem);
}
.frag-a.visible { transform: rotate(-1.5deg) translateY(0); }
.frag-b {
    width: 220px; height: 300px;
    background: linear-gradient(200deg, #2a2a2a 0%, #5c5c5c 45%, #d9d3c7 100%);
    background-size: 150% 150%;
    background-position: 30% 20%;
    transform: rotate(2deg) translateY(2rem);
    margin-top: -3rem;
    margin-left: 5rem;
    z-index: 2;
    mix-blend-mode: multiply;
}
.frag-b.visible { transform: rotate(2deg) translateY(0); }
.frag-c {
    width: 180px; height: 240px;
    background: linear-gradient(160deg, #3d2e24 0%, #7a7a7a 50%, #f0ece4 100%);
    background-size: 150% 150%;
    transform: rotate(-0.8deg) translateY(2rem);
    margin-top: -4rem;
    margin-left: 10rem;
    z-index: 1;
}
.frag-c.visible { transform: rotate(-0.8deg) translateY(0); }
.frag-d {
    width: 100%; height: 220px;
    background: linear-gradient(190deg, #1c1c1e 0%, #4a5a5c 50%, #c8c0b4 100%);
    background-size: 150% 150%;
    transform: rotate(1.8deg) translateY(2rem);
}
.frag-d.visible { transform: rotate(1.8deg) translateY(0); }
.frag-e {
    width: 100%; height: 180px;
    background: linear-gradient(170deg, #2a2a2a 0%, #7a7a7a 60%, #d9d3c7 100%);
    background-size: 150% 150%;
    transform: rotate(-2.5deg) translateY(2rem);
    margin-top: -2rem;
    mix-blend-mode: multiply;
    z-index: 2;
}
.frag-e.visible { transform: rotate(-2.5deg) translateY(0); }
.frag-f {
    width: 80%; height: 200px;
    background: linear-gradient(180deg, #3d2e24 0%, #5c5c5c 40%, #c8c0b4 100%);
    background-size: 150% 150%;
    transform: rotate(0.5deg) translateY(2rem);
    margin-top: -1.5rem;
}
.frag-f.visible { transform: rotate(0.5deg) translateY(0); }
.frag-g {
    width: 100%; height: 250px;
    background: linear-gradient(175deg, #1c1c1e 0%, #8b4f3a 30%, #c8c0b4 70%, #f0ece4 100%);
    background-size: 150% 150%;
    transform: rotate(-1deg) translateY(2rem);
}
.frag-g.visible { transform: rotate(-1deg) translateY(0); }
.frag-h {
    width: 100%; height: 280px;
    background: linear-gradient(200deg, #1c1c1e 0%, #4a5a5c 50%, #d9d3c7 100%);
    background-size: 150% 150%;
    transform: rotate(2.2deg) translateY(2rem);
}
.frag-h.visible { transform: rotate(2.2deg) translateY(0); }
.frag-i {
    width: 100%; height: 200px;
    background: linear-gradient(160deg, #2a2a2a 0%, #3d2e24 40%, #c8c0b4 100%);
    background-size: 150% 150%;
    transform: rotate(-1.2deg) translateY(2rem);
    margin-top: -2rem;
    mix-blend-mode: multiply;
    z-index: 2;
}
.frag-i.visible { transform: rotate(-1.2deg) translateY(0); }

/* ============================
   SPREAD 1: OPENING
   ============================ */
.spread-opening {
    min-height: 100vh;
    display: flex;
    align-items: center;
}
.spread-opening .spread-grid {
    align-items: center;
}
.watermark {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-family: 'Playfair Display', serif;
    font-weight: 400;
    font-size: clamp(8rem, 15vw, 14rem);
    color: var(--collage-overlay);
    pointer-events: none;
    z-index: 0;
    line-height: 1;
}
.opening-title {
    grid-column: 3 / 11;
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    font-size: clamp(2.5rem, 7vw, 7rem);
    letter-spacing: -0.03em;
    line-height: 0.95;
    color: var(--bg-dark);
    text-shadow: 1px 1px 0px rgba(0,0,0,0.06);
    position: relative;
    z-index: 2;
    opacity: 0;
    transform: translateY(3rem);
    transition: opacity 1200ms cubic-bezier(0.25, 0.1, 0.25, 1), transform 1200ms cubic-bezier(0.25, 0.1, 0.25, 1);
}
.opening-title.visible {
    opacity: 1;
    transform: translateY(0);
}
.opening-sub {
    grid-column: 3 / 8;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-top: 1.5rem;
    position: relative;
    z-index: 2;
    opacity: 0;
    transform: translateY(2rem);
    transition: opacity 1200ms cubic-bezier(0.25, 0.1, 0.25, 1) 0.2s, transform 1200ms cubic-bezier(0.25, 0.1, 0.25, 1) 0.2s;
}
.opening-sub.visible { opacity: 1; transform: translateY(0); }
.opening-collage {
    grid-column: 7 / 13;
    position: relative;
    z-index: 1;
    margin-top: 3rem;
}

/* ============================
   SPREAD 2: CONTRADICTION
   ============================ */
.spread-contradiction .text-col--left {
    grid-column: 2 / 7;
    opacity: 0;
    transform: translateY(3rem);
    transition: opacity 1200ms cubic-bezier(0.25, 0.1, 0.25, 1), transform 1200ms cubic-bezier(0.25, 0.1, 0.25, 1);
}
.spread-contradiction .text-col--left.visible {
    opacity: 1;
    transform: translateY(0);
}
.spread-contradiction .collage-col--right {
    grid-column: 8 / 13;
    display: flex;
    flex-direction: column;
    gap: 0;
}

/* ============================
   SPREAD 3: EVIDENCE
   ============================ */
.spread-evidence {
    min-height: 120vh;
}
.evidence-block {
    opacity: 0;
    transform: translateY(3rem);
    transition: opacity 1200ms cubic-bezier(0.25, 0.1, 0.25, 1), transform 1200ms cubic-bezier(0.25, 0.1, 0.25, 1);
}
.evidence-block.visible {
    opacity: 1;
    transform: translateY(0);
}
.evidence-block--a { grid-column: 1 / 5; grid-row: 1; }
.evidence-block--b { grid-column: 5 / 10; grid-row: 2; margin-top: 10vh; }
.evidence-block--c { grid-column: 9 / 13; grid-row: 3; margin-top: 5vh; }
.evidence-label {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.6875rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-secondary);
    display: block;
    margin-bottom: 1rem;
}

/* ============================
   SPREAD 4: ANALYSIS
   ============================ */
.spread-analysis .collage-col--left-img {
    grid-column: 1 / 6;
    display: flex;
    flex-direction: column;
    gap: 0;
}
.spread-analysis .text-col--right-analysis {
    grid-column: 7 / 13;
    max-width: 48ch;
    opacity: 0;
    transform: translateY(3rem);
    transition: opacity 1200ms cubic-bezier(0.25, 0.1, 0.25, 1), transform 1200ms cubic-bezier(0.25, 0.1, 0.25, 1);
}
.spread-analysis .text-col--right-analysis.visible {
    opacity: 1;
    transform: translateY(0);
}
.marginal-gloss {
    font-family: 'Playfair Display', serif;
    font-style: italic;
    font-size: 1.25rem;
    color: var(--collage-overlay);
    writing-mode: vertical-rl;
    position: absolute;
    right: -3rem;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0.4;
}

/* ============================
   SPREAD 5: SYNTHESIS
   ============================ */
.spread-synthesis .synthesis-col {
    grid-column: 4 / 10;
    opacity: 0;
    transform: translateY(3rem);
    transition: opacity 1200ms cubic-bezier(0.25, 0.1, 0.25, 1), transform 1200ms cubic-bezier(0.25, 0.1, 0.25, 1);
}
.spread-synthesis .synthesis-col.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================
   SPREAD 6: INDEX
   ============================ */
.spread-index {
    min-height: 50vh;
}
.spread-index .index-content {
    grid-column: 3 / 11;
    opacity: 0;
    transform: translateY(2rem);
    transition: opacity 1200ms cubic-bezier(0.25, 0.1, 0.25, 1), transform 1200ms cubic-bezier(0.25, 0.1, 0.25, 1);
}
.spread-index .index-content.visible {
    opacity: 1;
    transform: translateY(0);
}
.index-heading {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: -0.02em;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}
.index-columns {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.6875rem;
    letter-spacing: 0.04em;
    color: var(--text-secondary);
    line-height: 2;
    border-top: 0.5px solid var(--rule-color);
    padding-top: 1rem;
}
.index-col {
    border-right: 0.5px solid var(--rule-color);
    padding-right: 1rem;
}
.index-col:last-child { border-right: none; }
.colophon {
    margin-top: 3rem;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.625rem;
    letter-spacing: 0.06em;
    color: var(--collage-overlay);
    line-height: 2;
}

/* ============================
   RESPONSIVE
   ============================ */
@media (max-width: 900px) {
    .spread-grid {
        grid-template-columns: 1fr;
        padding: 0 2rem;
    }
    .opening-title, .opening-sub,
    .text-col--left, .collage-col--right,
    .evidence-block--a, .evidence-block--b, .evidence-block--c,
    .collage-col--left-img, .text-col--right-analysis,
    .synthesis-col, .index-content {
        grid-column: 1 / -1 !important;
    }
    .evidence-block--b, .evidence-block--c { margin-top: 2rem; grid-row: auto; }
    .spine { display: none; }
    .marginal-gloss { display: none; }
    .spread-number { font-size: 3rem; }
    .frag-a, .frag-b, .frag-c { width: 100%; }
    .frag-b, .frag-c { margin-left: 0; }
    .index-columns { grid-template-columns: 1fr; }
    .index-col { border-right: none; border-bottom: 0.5px solid var(--rule-color); padding-bottom: 0.5rem; }
}