/* ============================================================
   renai.tube — Coral Archive Design System
   Seapunk × Book-Scholarly × Burgundy-Cream
   ============================================================ */

/* CSS Custom Properties */
:root {
    --burgundy-deep: #2d0a1a;
    --burgundy-mid: #8b2642;
    --rose-dust: #c9506e;
    --cream-warm: #f5e8d0;
    --cream-antique: #eddcc8;
    --teal-seapunk: #3a7d8c;
    --violet-seapunk: #7b4a8b;
    --aqua-mist: #b8e0d8;
    --text-dark: #3a1a26;
    --text-light: #eddcc8;
    --marginalia: #9d6b7a;

    --font-display: 'Cormorant SC', Georgia, serif;
    --font-body: 'EB Garamond', Georgia, serif;

    --spine-width: 2px;
    --spine-left: 40px;
    --content-max: 680px;
    --marginalia-width: 220px;

    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ============================================================
   Base Reset & Typography
   ============================================================ */

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

html {
    scroll-behavior: smooth;
    font-size: 17px;
}

body {
    font-family: var(--font-body);
    font-weight: 400;
    color: var(--text-dark);
    background: var(--burgundy-deep);
    overflow-x: hidden;
    line-height: 1.75;
    letter-spacing: -0.01em;
}

/* ============================================================
   Left Spine Navigation
   ============================================================ */

.spine {
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    width: 200px;
    z-index: 100;
    display: flex;
    align-items: center;
    pointer-events: none;
}

.spine-line {
    position: absolute;
    left: var(--spine-left);
    top: 0;
    width: var(--spine-width);
    height: 100%;
    background: var(--burgundy-mid);
    transform-origin: top center;
    transform: scaleY(0);
    transition: transform 0.6s var(--ease-out-expo);
}

.spine-line.revealed {
    transform: scaleY(1);
}

.spine-line::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: -3px;
    width: 8px;
    height: 8px;
    background: var(--teal-seapunk);
    border-radius: 50%;
    opacity: 0;
    box-shadow: 0 0 16px 4px var(--teal-seapunk);
    animation: spineGlowPulse 0.8s ease-out 0.8s forwards;
}

@keyframes spineGlowPulse {
    0% { opacity: 0; }
    40% { opacity: 0.9; }
    100% { opacity: 0; }
}

.spine-chapters {
    position: absolute;
    left: var(--spine-left);
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 28px;
    pointer-events: all;
}

.spine-chapter {
    display: flex;
    align-items: center;
    gap: 0;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    position: relative;
}

.spine-chapter .chapter-num {
    font-family: var(--font-display);
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--burgundy-mid);
    writing-mode: vertical-rl;
    text-orientation: mixed;
    transform: rotate(180deg);
    width: 12px;
    opacity: 0.6;
    transition: opacity 0.3s ease;
}

.spine-chapter .chapter-title {
    font-family: var(--font-display);
    font-size: 11px;
    letter-spacing: 0.14em;
    color: var(--cream-warm);
    white-space: nowrap;
    max-width: 0;
    overflow: hidden;
    opacity: 0;
    transform: translateX(-4px);
    transition: max-width 0.4s var(--ease-out-expo),
                opacity 0.3s ease,
                transform 0.3s ease;
    padding-left: 0;
}

.spine:hover .spine-chapter .chapter-title,
.spine-chapter:hover .chapter-title {
    max-width: 140px;
    opacity: 1;
    transform: translateX(8px);
    padding-left: 4px;
}

.spine:hover .spine-chapter .chapter-num {
    opacity: 1;
}

/* ============================================================
   Folio System — Full-Height Sections
   ============================================================ */

.folio {
    position: relative;
    min-height: 100vh;
    padding: 80px 80px 80px calc(var(--spine-left) + 48px);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* Folio type backgrounds */
.folio-dark {
    background: var(--burgundy-deep);
    color: var(--text-light);
}

.folio-light {
    background: var(--cream-warm);
    color: var(--text-dark);
    margin-top: -48px; /* page overlap effect */
}

.folio-antique {
    background: var(--cream-antique);
    color: var(--text-dark);
    margin-top: -48px;
}

/* ============================================================
   Watermark Glyphs
   ============================================================ */

.watermark-glyph {
    position: absolute;
    font-family: var(--font-display);
    font-size: 400px;
    font-weight: 400;
    color: var(--cream-warm);
    opacity: 0.04;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    user-select: none;
    line-height: 1;
    z-index: 0;
}

.folio-dark .watermark-glyph {
    color: var(--cream-warm);
}

.folio-light .watermark-glyph,
.folio-antique .watermark-glyph {
    color: var(--burgundy-mid);
    opacity: 0.04;
}

.watermark-glyph-colophon {
    font-size: 500px;
    opacity: 0.03;
}

/* ============================================================
   Folio 1 — Frontispiece
   ============================================================ */

.folio-1-content {
    position: relative;
    z-index: 1;
    padding-bottom: 40px;
}

.site-title {
    font-family: var(--font-display);
    font-size: 88px;
    font-weight: 400;
    color: var(--cream-warm);
    line-height: 1;
    letter-spacing: 0.02em;
    margin-bottom: 32px;
}

.site-title .char {
    display: inline-block;
    opacity: 0;
    transform: translateY(8px);
}

.site-title .char.assembled {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s var(--ease-out-expo),
                transform 0.6s var(--ease-out-expo);
}

.epigraph {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 14px;
    color: var(--marginalia);
    text-align: right;
    max-width: var(--content-max);
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.6s var(--ease-out-expo),
                transform 0.6s var(--ease-out-expo);
    letter-spacing: 0.02em;
    margin-bottom: 6px;
}

.epigraph.visible {
    opacity: 1;
    transform: translateY(0);
}

.epigraph-translation {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 12px;
    color: var(--marginalia);
    text-align: right;
    max-width: var(--content-max);
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.6s var(--ease-out-expo) 0.15s,
                transform 0.6s var(--ease-out-expo) 0.15s;
    letter-spacing: 0.02em;
}

.epigraph-translation.visible {
    opacity: 1;
    transform: translateY(0);
}

.folio-1-card-zone {
    position: absolute;
    bottom: 80px;
    right: 80px;
    z-index: 2;
    width: 320px;
}

/* ============================================================
   Chapter Ornaments — SVG Rules
   ============================================================ */

.chapter-ornament-container {
    position: relative;
    z-index: 1;
    margin-bottom: 40px;
}

.chapter-rule {
    width: 100%;
    max-width: var(--content-max);
    display: block;
    overflow: visible;
}

.rule-path {
    stroke-dasharray: 680;
    stroke-dashoffset: 680;
    transition: stroke-dashoffset 0.8s var(--ease-out-expo);
}

.rule-path.drawn {
    stroke-dashoffset: 0;
}

.chapter-label {
    font-family: var(--font-display);
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--burgundy-mid);
    display: block;
    margin-top: 8px;
    text-transform: uppercase;
}

.chapter-label-light {
    color: var(--rose-dust);
}

/* ============================================================
   Folio Grid — Main + Marginalia
   ============================================================ */

.folio-grid {
    display: grid;
    grid-template-columns: 1fr var(--marginalia-width);
    gap: 48px;
    max-width: calc(var(--content-max) + var(--marginalia-width) + 48px);
    position: relative;
    z-index: 1;
    align-items: start;
    margin-bottom: 40px;
}

.folio-main {
    max-width: var(--content-max);
}

.chapter-heading {
    font-family: var(--font-display);
    font-size: 52px;
    font-weight: 400;
    color: var(--burgundy-mid);
    line-height: 1.1;
    margin-bottom: 32px;
    letter-spacing: 0.01em;
}

.chapter-heading-light {
    color: var(--cream-warm);
}

.body-text {
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 1.75;
    letter-spacing: -0.01em;
    color: var(--text-dark);
    margin-bottom: 24px;
    max-width: var(--content-max);
}

.body-text p + p {
    margin-top: 20px;
}

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

/* Fade-reveal animation for body blocks */
.fade-reveal {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.6s var(--ease-out-expo),
                transform 0.6s var(--ease-out-expo);
}

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

/* ============================================================
   Marginalia Column
   ============================================================ */

.folio-marginalia {
    padding-top: 48px;
}

.marginalia-item {
    display: flex;
    gap: 10px;
    margin-bottom: 32px;
    opacity: 0;
    transform: translateX(8px);
    transition: opacity 0.6s var(--ease-out-expo),
                transform 0.6s var(--ease-out-expo);
}

.marginalia-item.visible {
    opacity: 1;
    transform: translateX(0);
}

.margin-bracket {
    flex-shrink: 0;
    width: 2px;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.margin-bracket.drawn {
    opacity: 1;
}

.bracket-path {
    stroke-dasharray: 120;
    stroke-dashoffset: 120;
    transition: stroke-dashoffset 0.6s var(--ease-out-expo);
}

.bracket-path.drawn {
    stroke-dashoffset: 0;
}

.marginalia-item p {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 13px;
    color: var(--marginalia);
    line-height: 1.6;
    transform: rotate(-1deg);
}

.marginalia-text-light {
    color: var(--rose-dust);
}

/* ============================================================
   Glassmorphic Cards — Illuminated Manuscript Leaves
   ============================================================ */

.folio-cards {
    position: relative;
    z-index: 2;
    display: flex;
    gap: -4px;
    margin-top: 32px;
    margin-left: auto;
    max-width: 620px;
    justify-content: flex-end;
    align-items: flex-start;
}

.glass-card {
    background: rgba(245, 232, 208, 0.72);
    backdrop-filter: blur(12px) saturate(1.4);
    -webkit-backdrop-filter: blur(12px) saturate(1.4);
    border: 1px solid rgba(58, 125, 140, 0.28);
    box-shadow: 0 4px 32px rgba(45, 10, 26, 0.12),
                inset 0 0 0 1px rgba(123, 74, 139, 0.08);
    border-radius: 24px 4px 4px 4px;
    padding: 24px 28px;
    width: 280px;
    position: relative;
    opacity: 0;
}

.glass-card.visible {
    opacity: 1;
}

.glass-card-dark {
    background: rgba(245, 232, 208, 0.65);
    border-color: rgba(58, 125, 140, 0.35);
    box-shadow: 0 4px 32px rgba(45, 10, 26, 0.22),
                inset 0 0 0 1px rgba(123, 74, 139, 0.14);
}

/* Card rotations */
.card-rotate-neg2 {
    transform: rotate(-2deg);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}
.card-rotate-neg3 {
    transform: rotate(-3deg);
    margin-left: -4px;
    transition: opacity 0.8s ease-out 0.15s, transform 0.8s ease-out 0.15s;
}
.card-rotate-pos2 {
    transform: rotate(2deg);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}
.card-rotate-pos1 {
    transform: rotate(1deg);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

/* When visible, cards animate to their final rotation */
.card-rotate-neg2.visible {
    opacity: 1;
    transform: rotate(-2deg);
}
.card-rotate-neg3.visible {
    opacity: 1;
    transform: rotate(-3deg);
}
.card-rotate-pos2.visible {
    opacity: 1;
    transform: rotate(2deg);
}
.card-rotate-pos1.visible {
    opacity: 1;
    transform: rotate(1deg);
}

/* Start from a slightly less rotated position */
.card-rotate-neg2 { transform: rotate(-5deg); }
.card-rotate-neg3 { transform: rotate(-6deg); }
.card-rotate-pos2 { transform: rotate(5deg); }
.card-rotate-pos1 { transform: rotate(4deg); }

.card-text {
    font-family: var(--font-body);
    font-size: 14px;
    line-height: 1.65;
    color: var(--text-dark);
    margin-bottom: 16px;
}

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

.citation {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 11px;
    letter-spacing: 0.02em;
    color: var(--marginalia);
    display: block;
    font-variant: small-caps;
}

.citation-dark {
    color: var(--burgundy-mid);
}

/* ============================================================
   Section Footers — Bibliographic Citations
   ============================================================ */

.section-footer {
    margin-top: auto;
    padding-top: 32px;
    position: relative;
    z-index: 1;
}

.citation-footer {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 11px;
    letter-spacing: 0.02em;
    color: var(--marginalia);
    font-variant: small-caps;
}

.citation-footer-light {
    color: var(--rose-dust);
}

/* ============================================================
   Page Fold Corner
   ============================================================ */

.page-fold-corner {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 0 16px 16px;
    border-color: transparent transparent var(--cream-antique) transparent;
    z-index: 10;
}

.folio-dark .page-fold-corner {
    border-color: transparent transparent var(--cream-antique) transparent;
}

.folio-dark .page-fold-corner::after {
    content: '';
    position: absolute;
    bottom: -16px;
    right: -16px;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 16px 16px 0;
    border-color: transparent var(--teal-seapunk) transparent transparent;
}

/* ============================================================
   Folio 4 — Annotations Layout
   ============================================================ */

.folio-annotations-layout {
    display: grid;
    grid-template-columns: 480px 1fr;
    gap: 48px;
    position: relative;
    z-index: 1;
    margin-bottom: 32px;
    align-items: start;
}

.annotations-center-col {
    max-width: 480px;
}

.annotations-center-col .body-text {
    font-size: 16px;
    max-width: 480px;
}

.annotations-margins {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.annotation-block {
    display: flex;
    gap: 12px;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.6s var(--ease-out-expo),
                transform 0.6s var(--ease-out-expo);
}

.annotation-block.visible {
    opacity: 1;
    transform: translateY(0);
}

.margin-bracket-wide {
    flex-shrink: 0;
    width: 2px;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.margin-bracket-wide.drawn {
    opacity: 1;
}

.annotation-content {
    flex: 1;
}

.annotation-text {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 13px;
    line-height: 1.6;
    color: var(--marginalia);
    margin-bottom: 6px;
}

.annotation-source {
    font-family: var(--font-display);
    font-size: 10px;
    letter-spacing: 0.12em;
    color: var(--burgundy-mid);
    display: block;
    font-variant: small-caps;
}

.annotations-cards {
    justify-content: center;
    margin-left: 0;
}

/* ============================================================
   Folio 5 — Colophon
   ============================================================ */

.folio-colophon {
    justify-content: center;
    align-items: center;
    text-align: center;
    padding-left: calc(var(--spine-left) + 48px);
}

.colophon-content {
    position: relative;
    z-index: 1;
    max-width: 560px;
    margin: 0 auto;
}

.colophon-title {
    font-family: var(--font-display);
    font-size: 52px;
    font-weight: 400;
    color: var(--burgundy-mid);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 24px;
    line-height: 1;
}

.colophon-rule-container {
    display: flex;
    justify-content: center;
    margin-bottom: 32px;
}

.colophon-rule {
    max-width: 320px;
}

.colophon-subtitle {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 12px;
}

.colophon-citation {
    margin-top: 40px;
    padding-top: 24px;
    border-top: 1px solid rgba(139, 38, 66, 0.3);
}

/* ============================================================
   Spine retract state (Colophon trigger)
   ============================================================ */

.spine-line.retracting {
    transform-origin: bottom center;
    transition: transform 1.2s var(--ease-out-expo);
    transform: scaleY(0);
}

/* ============================================================
   Responsive adjustments
   ============================================================ */

@media (max-width: 900px) {
    .folio {
        padding: 60px 40px 60px calc(var(--spine-left) + 32px);
    }

    .folio-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .folio-marginalia {
        padding-top: 0;
        display: none;
    }

    .folio-annotations-layout {
        grid-template-columns: 1fr;
    }

    .folio-1-card-zone {
        position: relative;
        bottom: auto;
        right: auto;
        width: 100%;
        margin-top: 32px;
    }

    .site-title {
        font-size: 52px;
    }

    .folio-cards {
        flex-direction: column;
        max-width: 100%;
    }

    .glass-card {
        width: 100%;
        max-width: 320px;
    }
}

@media (max-width: 600px) {
    :root {
        --spine-left: 20px;
    }

    .folio {
        padding: 48px 24px 48px calc(var(--spine-left) + 24px);
    }

    .site-title {
        font-size: 38px;
    }

    .chapter-heading {
        font-size: 36px;
    }

    .spine-chapters {
        display: none;
    }
}