/* ============================================
   mujun.work - Dark-Academia Annotated Manuscript
   ============================================ */
:root {
    --aged-parchment: #F2E8D5;
    --library-umber: #2C1810;
    --foxed-cream: #E8D5B8;
    --india-ink: #1A120B;
    --faded-annotation: #6B5744;
    --terracotta-seal: #B8542A;
    --burnished-brass: #C49B3A;
    --moss-binding: #4A6741;
    --leather-spine: #8B6F4E;
    --lamplight-wash: rgba(194, 155, 58, 0.08);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
    background: var(--aged-parchment);
    color: var(--india-ink);
    font-family: 'Lora', serif;
    font-weight: 400;
    font-size: clamp(1rem, 1.15vw, 1.2rem);
    line-height: 1.72;
    letter-spacing: 0.005em;
    overflow-x: hidden;
}

/* --- Grain Overlay (Global) --- */
.grain-overlay {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.18;
    mix-blend-mode: overlay;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
    background-size: 200px 200px;
    animation: grain-drift 4s steps(4) infinite;
}
@keyframes grain-drift {
    0% { background-position: 0 0; }
    25% { background-position: -2px 1px; }
    50% { background-position: 1px -1px; }
    75% { background-position: -1px -2px; }
    100% { background-position: 0 0; }
}

/* --- Navigation Glyph --- */
.nav-glyph {
    position: fixed;
    top: 2rem;
    right: 2rem;
    z-index: 1000;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.nav-menu {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    opacity: 0;
    transform: translateX(10px);
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
    position: absolute;
    right: 40px;
    top: -8px;
    background: var(--aged-parchment);
    padding: 1rem 1.5rem;
    border-radius: 4px;
    box-shadow: 0 4px 20px rgba(26, 18, 11, 0.12);
}
.nav-glyph:hover .nav-menu,
.nav-glyph.active .nav-menu {
    opacity: 1;
    transform: translateX(0);
    pointer-events: auto;
}
.nav-link {
    font-family: 'Quicksand', sans-serif;
    font-weight: 500;
    font-size: clamp(0.75rem, 0.9vw, 0.9rem);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--faded-annotation);
    text-decoration: none;
    white-space: nowrap;
    transition: color 0.2s ease;
}
.nav-link:hover { color: var(--terracotta-seal); }
.nav-link:visited { color: var(--moss-binding); }
.nav-arrow {
    display: inline-block;
    color: var(--terracotta-seal);
    margin-right: 0.3em;
    font-weight: 700;
}

/* --- Section Base --- */
.section {
    position: relative;
    min-height: 100vh;
    padding: clamp(3rem, 6vw, 6rem) clamp(2rem, 4vw, 4rem);
}

/* --- Page Turn Divider --- */
.page-turn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    padding: 3rem 0;
    position: relative;
}
.page-rule {
    display: block;
    width: 0;
    height: 1px;
    background: var(--leather-spine);
    transition: width 0.5s ease;
}
.page-turn.visible .page-rule {
    width: min(30vw, 200px);
}
.diamond-ornament {
    width: 8px;
    height: 8px;
    background: var(--burnished-brass);
    transform: rotate(45deg) scale(0);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    flex-shrink: 0;
    margin: 0 4px;
}
.page-turn.visible .diamond-ornament {
    transform: rotate(45deg) scale(1);
}

/* --- Typography --- */
.section-heading {
    font-family: 'Nunito', sans-serif;
    font-weight: 700;
    font-size: clamp(1.6rem, 3.5vw, 3rem);
    letter-spacing: -0.02em;
    line-height: 1.05;
    color: var(--india-ink);
    margin-bottom: 2rem;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.section-heading.visible {
    opacity: 1;
    transform: translateY(0);
}
.body-text {
    font-family: 'Lora', serif;
    font-size: clamp(1rem, 1.15vw, 1.2rem);
    line-height: 1.72;
    color: var(--india-ink);
    margin-bottom: 1.5rem;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.body-text.visible {
    opacity: 1;
    transform: translateY(0);
}
.drop-cap {
    font-family: 'Nunito', sans-serif;
    font-weight: 900;
    float: left;
    font-size: 3.6em;
    line-height: 0.8;
    padding-right: 0.08em;
    padding-top: 0.05em;
    color: var(--library-umber);
}

/* ============================
   SECTION 1: THE COLOPHON
   ============================ */
.section-colophon {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--library-umber);
    color: var(--foxed-cream);
    text-align: center;
}
.section-colophon .grain-overlay,
.section-colophon::after {
    mix-blend-mode: overlay;
}
.colophon-content {
    position: relative;
    z-index: 1;
}
.colophon-meta {
    font-family: 'Quicksand', sans-serif;
    font-weight: 300;
    font-size: clamp(0.75rem, 0.9vw, 0.9rem);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--faded-annotation);
    display: block;
    margin-bottom: 1.5rem;
}
.colophon-title {
    font-family: 'Nunito', sans-serif;
    font-weight: 900;
    font-size: clamp(3rem, 7vw, 6.5rem);
    letter-spacing: -0.02em;
    line-height: 1.05;
    color: var(--foxed-cream);
    margin-bottom: 1.5rem;
}
.colophon-dot {
    color: var(--terracotta-seal);
}
.magnetic-word {
    display: inline-block;
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.colophon-epigraph {
    font-family: 'Lora', serif;
    font-weight: 400;
    font-style: italic;
    font-size: clamp(1rem, 1.3vw, 1.2rem);
    color: var(--leather-spine);
    opacity: 0.8;
}

/* ============================
   SECTION 2: THE FIRST CHAPTER
   ============================ */
.section-chapter {
    padding-top: clamp(4rem, 8vw, 8rem);
    padding-bottom: clamp(4rem, 8vw, 8rem);
}
.manuscript-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 0 24px;
    max-width: 1200px;
    margin: 0 auto;
}
.main-column {
    grid-column: 2 / 8;
}
.margin-column {
    grid-column: 9 / 12;
    padding-top: 2rem;
}

/* Pull Quote */
.pull-quote {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 2.5rem 0;
    padding: 1.5rem 0;
    opacity: 0;
    transform: scale(0.95);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.pull-quote.visible {
    opacity: 1;
    transform: scale(1);
}
.pull-quote-text {
    font-family: 'Nunito', sans-serif;
    font-weight: 700;
    font-size: clamp(1.15rem, 1.6vw, 1.5rem);
    line-height: 1.4;
    color: var(--terracotta-seal);
}
.angle-bracket {
    flex-shrink: 0;
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.pull-quote.visible .angle-bracket--left {
    animation: bracketLeft 0.6s ease-out 0.3s both;
}
.pull-quote.visible .angle-bracket--right {
    animation: bracketRight 0.6s ease-out 0.3s both;
}
@keyframes bracketLeft {
    from { transform: translateX(-20px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}
@keyframes bracketRight {
    from { transform: translateX(20px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* Margin Annotations */
.margin-annotation {
    opacity: 0;
    transform: translateX(20px);
    transition: opacity 0.4s ease-out, transform 0.4s ease-out;
}
.margin-annotation.visible {
    opacity: 1;
    transform: translateX(0);
}
.annotation-icon {
    display: block;
    margin-bottom: 0.5rem;
}
.annotation-date {
    font-family: 'Quicksand', sans-serif;
    font-weight: 500;
    font-size: clamp(0.7rem, 0.8vw, 0.8rem);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--faded-annotation);
    display: block;
    margin-bottom: 0.5rem;
}
.annotation-text {
    font-family: 'Quicksand', sans-serif;
    font-weight: 300;
    font-size: clamp(0.8rem, 0.9vw, 0.9rem);
    line-height: 1.6;
    color: var(--faded-annotation);
}

/* ============================
   SECTION 3: THE FOLIO SPREAD
   ============================ */
.section-folio {
    padding-top: clamp(4rem, 6vw, 6rem);
    padding-bottom: clamp(4rem, 6vw, 6rem);
}
.section-folio .section-heading {
    text-align: center;
}
.folio-grid {
    display: flex;
    gap: 0;
    max-width: 1100px;
    margin: 0 auto;
    align-items: stretch;
}
.folio-column {
    flex: 1;
    padding: 0 clamp(1.5rem, 3vw, 3rem);
    opacity: 0;
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.folio-column--left {
    transform: translateX(-20px);
}
.folio-column--right {
    transform: translateX(20px);
}
.folio-column.visible {
    opacity: 1;
    transform: translateX(0);
}
.folio-heading {
    font-family: 'Nunito', sans-serif;
    font-weight: 700;
    font-size: clamp(1.2rem, 2vw, 1.8rem);
    letter-spacing: -0.01em;
    color: var(--india-ink);
    margin-bottom: 1rem;
}
.dotted-rule {
    height: 1px;
    background: repeating-linear-gradient(
        90deg,
        var(--leather-spine) 0px,
        var(--leather-spine) 4px,
        transparent 4px,
        transparent 12px
    );
    margin-bottom: 1.5rem;
}
.folio-gutter {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
    padding: 0 8px;
    flex-shrink: 0;
}
.gutter-line {
    display: block;
    width: 1px;
    flex: 1;
    background: var(--leather-spine);
}
.folio-gutter .diamond-ornament {
    transform: rotate(45deg) scale(1);
    margin: 8px 0;
}

/* ============================
   SECTION 4: THE MARGINALIA
   ============================ */
.section-marginalia {
    padding-top: clamp(4rem, 6vw, 6rem);
    padding-bottom: clamp(4rem, 6vw, 6rem);
}
.marginalia-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 0 24px;
    max-width: 1200px;
    margin: 0 auto;
}
.marginalia-main {
    grid-column: 2 / 7;
}
.marginalia-margin {
    grid-column: 8 / 12;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    padding-top: 3rem;
    background: var(--foxed-cream);
    border-radius: 4px;
    padding: 2rem clamp(1rem, 2vw, 2rem);
}
.margin-note {
    opacity: 0;
    transform: translateX(20px);
    transition: opacity 0.4s ease-out, transform 0.4s ease-out;
}
.margin-note.visible {
    opacity: 1;
    transform: translateX(0);
}
.margin-image {
    opacity: 0;
    transform: translateX(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.margin-image.visible {
    opacity: 1;
    transform: translateX(0);
}
.grain-image {
    width: 100%;
    aspect-ratio: 4 / 3;
    border-radius: 4px;
    position: relative;
    filter: sepia(0.25) saturate(0.85) contrast(1.05) brightness(0.95);
}
.grain-image::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
    background-size: 200px 200px;
    opacity: 0.2;
    mix-blend-mode: multiply;
    animation: grain-drift 4s steps(4) infinite;
    border-radius: 4px;
}
.image-caption {
    font-family: 'Quicksand', sans-serif;
    font-weight: 300;
    font-size: 0.78rem;
    color: var(--faded-annotation);
    display: block;
    margin-top: 0.5rem;
    font-style: italic;
}
.margin-ornament {
    text-align: center;
    opacity: 0;
    transform: scale(0);
    transition: opacity 0.3s ease, transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.margin-ornament.visible {
    opacity: 1;
    transform: scale(1);
}

/* ============================
   SECTION 5: THE PLATE
   ============================ */
.section-plate {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}
.plate-image {
    position: absolute;
    inset: 0;
    z-index: 0;
}
.plate-gradient {
    position: absolute;
    inset: 0;
    background: linear-gradient(160deg, var(--library-umber) 0%, var(--leather-spine) 35%, var(--burnished-brass) 60%, var(--foxed-cream) 85%, var(--aged-parchment) 100%);
    filter: sepia(0.25) saturate(0.85) contrast(1.05) brightness(0.95);
}
.plate-gradient::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
    background-size: 200px 200px;
    opacity: 0.2;
    mix-blend-mode: multiply;
    animation: grain-drift 4s steps(4) infinite;
}
.zigzag-border {
    position: absolute;
    left: 0;
    width: 100%;
    height: 12px;
    z-index: 1;
    background: repeating-linear-gradient(
        90deg,
        transparent 0px,
        transparent 12px,
        var(--leather-spine) 12px,
        var(--leather-spine) 24px
    );
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='12' viewBox='0 0 24 12'%3E%3Cpath d='M0 12L12 0L24 12' fill='white'/%3E%3C/svg%3E");
    mask-size: 24px 12px;
    mask-repeat: repeat-x;
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='12' viewBox='0 0 24 12'%3E%3Cpath d='M0 12L12 0L24 12' fill='white'/%3E%3C/svg%3E");
    -webkit-mask-size: 24px 12px;
    -webkit-mask-repeat: repeat-x;
    opacity: 0.6;
}
.zigzag-border--top { top: 0; }
.zigzag-border--bottom { bottom: 0; transform: scaleY(-1); }

.plate-overlay {
    position: relative;
    z-index: 1;
    max-width: 600px;
    padding: clamp(2rem, 4vw, 3.5rem);
    background: rgba(242, 232, 213, 0.88);
    clip-path: polygon(16px 0, calc(100% - 16px) 0, 100% 16px, 100% calc(100% - 16px), calc(100% - 16px) 100%, 16px 100%, 0 calc(100% - 16px), 0 16px);
    text-align: center;
    opacity: 0;
    transform: scale(0.92);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}
.plate-overlay.visible {
    opacity: 1;
    transform: scale(1);
}
.plate-text {
    font-family: 'Lora', serif;
    font-weight: 400;
    font-style: italic;
    font-size: clamp(1.05rem, 1.3vw, 1.3rem);
    line-height: 1.72;
    color: var(--india-ink);
    margin-bottom: 1.5rem;
}
.plate-attribution {
    font-family: 'Quicksand', sans-serif;
    font-weight: 500;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--faded-annotation);
}

/* ============================
   SECTION 6: THE ENDPAPER
   ============================ */
.section-endpaper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background: var(--aged-parchment);
}
.endpaper-pattern {
    position: absolute;
    inset: 0;
    z-index: 0;
    opacity: 0.15;
    background-image:
        linear-gradient(135deg, var(--foxed-cream) 25%, transparent 25%),
        linear-gradient(225deg, var(--foxed-cream) 25%, transparent 25%),
        linear-gradient(315deg, var(--foxed-cream) 25%, transparent 25%),
        linear-gradient(45deg, var(--foxed-cream) 25%, transparent 25%);
    background-size: 40px 40px;
    background-position: 0 0, 0 20px, 20px -20px, 20px 0px;
}
.endpaper-reserve {
    position: relative;
    z-index: 1;
    background: var(--aged-parchment);
    padding: clamp(3rem, 6vw, 5rem) clamp(3rem, 6vw, 6rem);
    text-align: center;
    max-width: 600px;
    box-shadow: 0 0 0 1px var(--leather-spine);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}
.endpaper-reserve.visible {
    opacity: 1;
    transform: translateY(0);
}
.endpaper-meta {
    font-family: 'Quicksand', sans-serif;
    font-weight: 500;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--faded-annotation);
    display: block;
    margin-bottom: 1rem;
}
.endpaper-title {
    font-family: 'Nunito', sans-serif;
    font-weight: 900;
    font-size: clamp(2rem, 4vw, 3.5rem);
    letter-spacing: -0.02em;
    color: var(--india-ink);
    margin-bottom: 1.5rem;
}
.endpaper-rule {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}
.endpaper-rule .page-rule {
    width: 60px;
    height: 1px;
    background: var(--leather-spine);
}
.endpaper-rule .diamond-ornament {
    transform: rotate(45deg) scale(1);
    margin: 0 8px;
}
.endpaper-text {
    font-family: 'Lora', serif;
    font-weight: 400;
    font-style: italic;
    font-size: clamp(1rem, 1.15vw, 1.15rem);
    line-height: 1.72;
    color: var(--india-ink);
    margin-bottom: 2rem;
}
.endpaper-colophon {
    font-family: 'Quicksand', sans-serif;
    font-weight: 300;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--faded-annotation);
    opacity: 0.6;
}

/* ============================
   RESPONSIVE
   ============================ */
@media (max-width: 900px) {
    .manuscript-grid {
        display: block;
        padding: 0 clamp(1.5rem, 4vw, 3rem);
    }
    .main-column,
    .margin-column {
        max-width: 100%;
    }
    .margin-column {
        margin-top: 2rem;
        padding-left: 1.5rem;
        border-left: 2px solid var(--terracotta-seal);
    }
    .marginalia-grid {
        display: block;
        padding: 0 clamp(1.5rem, 4vw, 3rem);
    }
    .marginalia-margin {
        margin-top: 2rem;
        padding-left: 1.5rem;
        border-left: 2px solid var(--terracotta-seal);
        background: transparent;
    }
    .folio-grid {
        flex-direction: column;
        gap: 2rem;
    }
    .folio-gutter {
        flex-direction: row;
        padding: 8px 0;
    }
    .gutter-line {
        width: auto;
        height: 1px;
        flex: 1;
    }
    .folio-gutter .diamond-ornament {
        margin: 0 8px;
    }
}

/* --- Magnetic Touch Fallback --- */
@media (pointer: coarse) {
    .magnetic {
        transition: transform 0.2s ease;
    }
    .magnetic:active {
        transform: scale(1.03);
    }
}