/* =========================================================
   MMIDDL.ai — A dark-academia reading room with a tropical
   aquarium glowing in the corner.
   Palette: deep-burgundy, warmed by tropical fish.
   Type: Sen 800 (geometric sans, Futura lineage) +
         Crimson Pro (Garalde book serif) +
         JetBrains Mono (monospace accent).
   ========================================================= */

:root {
    /* Palette */
    --vellum-cream: #F4ECDC;
    --vellum-shadow: #E6D9BE;
    --oxblood: #5B1A1F;
    --mahogany: #3A0F12;
    --burgundy-smoke: #8C4A4F;
    --persimmon: #FF6A2B;
    --citron: #F4C542;
    --damsel: #33B6C7;
    --coral: #E8967E;
    --refraction: #FBF8F1;

    /* Baseline grid: 8pt */
    --baseline: 8px;
    --column: 640px;
    --stage: 1440px;

    /* Type */
    --font-display: "Sen", "Futura", "Inter", system-ui, sans-serif;
    --font-body: "Crimson Pro", "Lora", Georgia, serif;
    --font-mono: "JetBrains Mono", "Menlo", monospace;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 26px;
    color: var(--oxblood);
    background-color: var(--vellum-cream);
    overflow-x: hidden;
    cursor: default;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================================
   Aquarium glass-tank aura — viewport-edge framing
   ============================================================ */
.aquarium-frame {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 5;
}

.tank-edge {
    position: absolute;
    left: 0;
    right: 0;
    height: 1px;
}

.tank-top {
    top: 0;
    background: linear-gradient(90deg,
        rgba(251, 248, 241, 0) 0%,
        rgba(251, 248, 241, 0.8) 30%,
        rgba(251, 248, 241, 0.95) 50%,
        rgba(251, 248, 241, 0.8) 70%,
        rgba(251, 248, 241, 0) 100%);
    box-shadow: 0 1px 0 rgba(251, 248, 241, 0.5);
}

.tank-bottom {
    bottom: 32px;
    height: 24px;
    background: radial-gradient(ellipse at center,
        rgba(232, 150, 126, 0.06) 0%,
        rgba(251, 248, 241, 0.04) 50%,
        rgba(232, 150, 126, 0) 100%);
}

.tank-corner {
    position: absolute;
    width: 80px;
    height: 80px;
    pointer-events: none;
}

.tank-corner-tl {
    top: 0; left: 0;
    background: radial-gradient(circle at top left,
        rgba(251, 248, 241, 0.5) 0%,
        rgba(251, 248, 241, 0) 60%);
}
.tank-corner-tr {
    top: 0; right: 0;
    background: radial-gradient(circle at top right,
        rgba(251, 248, 241, 0.5) 0%,
        rgba(251, 248, 241, 0) 60%);
}
.tank-corner-bl {
    bottom: 32px; left: 0;
    background: radial-gradient(circle at bottom left,
        rgba(232, 150, 126, 0.1) 0%,
        rgba(232, 150, 126, 0) 60%);
}
.tank-corner-br {
    bottom: 32px; right: 0;
    background: radial-gradient(circle at bottom right,
        rgba(232, 150, 126, 0.1) 0%,
        rgba(232, 150, 126, 0) 60%);
}

.caustic-shimmer {
    position: absolute;
    left: 0; right: 0;
    bottom: 32px;
    height: 24px;
    background:
        radial-gradient(ellipse 200px 12px at 20% 50%, rgba(232, 150, 126, 0.18), transparent 70%),
        radial-gradient(ellipse 160px 10px at 50% 50%, rgba(251, 248, 241, 0.20), transparent 70%),
        radial-gradient(ellipse 180px 14px at 80% 50%, rgba(232, 150, 126, 0.16), transparent 70%);
    background-size: 33% 100%, 40% 100%, 33% 100%;
    animation: caustic-drift 12s ease-in-out infinite alternate;
    opacity: 0.7;
    mix-blend-mode: multiply;
}

@keyframes caustic-drift {
    0%   { background-position:   0% 50%, 50% 50%, 100% 50%; }
    50%  { background-position:  20% 50%, 60% 50%,  85% 50%; }
    100% { background-position: 100% 50%, 50% 50%,   0% 50%; }
}

/* ============================================================
   Fish school — cursor-following SVG creatures
   ============================================================ */
.fish-school {
    position: fixed;
    top: 0; left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 2;
}

.fish {
    position: absolute;
    top: 0;
    left: 0;
    will-change: transform;
    transition: opacity 1.4s ease-out;
    opacity: 0;
    overflow: visible;
}

.fish.is-visible {
    opacity: 0.95;
}

.fish-body, .fish-tail {
    transform-box: fill-box;
    transform-origin: center;
}

.fish-tail {
    transform-origin: 8px 20px;
    animation: tail-waggle 1.2s ease-in-out infinite alternate;
}

.fish-tang .fish-tail {
    transform-origin: 8px 20px;
    animation-duration: 0.95s;
}

.fish-damsel .fish-tail {
    transform-origin: 8px 18px;
    animation-duration: 1.4s;
}

@keyframes tail-waggle {
    from { transform: rotate(-8deg); }
    to   { transform: rotate(8deg); }
}

/* ============================================================
   Progress strip — bottom 32px navigation
   ============================================================ */
.progress-strip {
    position: fixed;
    left: 0; right: 0;
    bottom: 0;
    height: 32px;
    background-color: var(--vellum-cream);
    border-top: 1px solid rgba(91, 26, 31, 0.15);
    z-index: 10;
    display: flex;
    align-items: center;
    padding: 0 32px;
    gap: 16px;
}

.progress-bar {
    flex: 1;
    height: 2px;
    background-color: rgba(91, 26, 31, 0.12);
    position: relative;
    overflow: hidden;
}

.progress-fill {
    position: absolute;
    inset: 0;
    background-color: var(--citron);
    transform-origin: left center;
    transform: scaleX(0);
    transition: transform 0.18s ease-out;
}

.progress-label {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: 11px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--burgundy-smoke);
    white-space: nowrap;
    min-width: 240px;
    text-align: right;
}

/* ============================================================
   Volume — the bound book
   ============================================================ */
.volume {
    position: relative;
    max-width: var(--stage);
    margin: 0 auto;
    padding: 0 32px 64px;
    z-index: 3;
}

.binding-stitch {
    position: fixed;
    left: max(32px, calc((100vw - var(--column)) / 2 - 24px));
    top: 0;
    bottom: 32px;
    width: 1px;
    background-color: rgba(91, 26, 31, 0.3);
    z-index: 4;
    pointer-events: none;
}

.binding-stitch::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: repeating-linear-gradient(
        to bottom,
        transparent 0,
        transparent 90px,
        var(--oxblood) 90px,
        var(--oxblood) 96px,
        transparent 96px,
        transparent 96px
    );
    background-size: 4px 96px;
    background-position: -2px 0;
    opacity: 0.35;
    margin-left: -2px;
    width: 5px;
}

.folio {
    position: fixed;
    top: 24px;
    right: max(32px, calc((100vw - var(--column)) / 2));
    font-family: var(--font-display);
    font-weight: 400;
    font-size: 11px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--burgundy-smoke);
    z-index: 11;
    display: flex;
    gap: 4px;
}

.folio-bracket {
    color: var(--burgundy-smoke);
}

/* ============================================================
   Spread — a single "page" in the bound volume
   ============================================================ */
.spread {
    max-width: var(--column);
    margin: 0 auto;
    min-height: 100vh;
    padding: 96px 0 96px;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.spread + .spread {
    padding-top: 96px;
    margin-top: 96px;
}

/* ============================================================
   Frontispiece
   ============================================================ */
.spread-frontispiece {
    min-height: 100vh;
    padding: 0;
    justify-content: center;
    align-items: center;
}

.frontispiece-inner {
    text-align: center;
}

.hero-title {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: clamp(72px, 12vw, 192px);
    line-height: 0.95;
    letter-spacing: -0.04em;
    color: var(--mahogany);
    margin-bottom: 48px;
    display: inline-flex;
    overflow: visible;
}

.hero-letter {
    display: inline-block;
    transform: translateY(8px);
    opacity: 0;
    transition: transform 1.4s cubic-bezier(0.16, 1, 0.3, 1),
                opacity 1.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.hero-letter.is-in {
    transform: translateY(0);
    opacity: 1;
}

.hero-subtitle {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--burgundy-smoke);
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 1.4s ease-out 0.8s, transform 1.4s ease-out 0.8s;
}

.hero-subtitle.is-in {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================================
   Chapter mark — § glyph + numeral
   ============================================================ */
.chapter-mark {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 32px;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.chapter-mark.is-in {
    opacity: 1;
    transform: translateY(0);
}

.section-glyph {
    display: inline-block;
    flex-shrink: 0;
}

.glyph-fish {
    transform-origin: 54px 60px;
    animation: glyph-fish-swim 4s ease-in-out infinite alternate;
}

@keyframes glyph-fish-swim {
    from { transform: translateX(-4px); }
    to   { transform: translateX(4px); }
}

.chapter-numeral {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 14px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--oxblood);
}

.chapter-title {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: clamp(36px, 5vw, 56px);
    line-height: 1.1;
    letter-spacing: 0.02em;
    color: var(--mahogany);
    margin-bottom: 48px;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.6s ease-out 0.08s, transform 0.6s ease-out 0.08s;
}

.chapter-title.is-in {
    opacity: 1;
    transform: translateY(0);
}

.chapter-title-mono {
    font-family: var(--font-mono);
    font-size: clamp(24px, 3vw, 32px);
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

/* ============================================================
   Body prose
   ============================================================ */
.body-prose {
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 26px;
    color: var(--oxblood);
    margin-bottom: 24px;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.body-prose.is-in {
    opacity: 1;
    transform: translateY(0);
}

.body-prose-first {
    text-indent: 0;
}

.body-prose-intro {
    font-style: italic;
    color: var(--burgundy-smoke);
}

/* Drop-cap initial */
.drop-cap {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 5em;
    line-height: 0.85;
    float: left;
    color: var(--oxblood);
    margin-right: 12px;
    margin-top: 6px;
    margin-bottom: -8px;
    padding: 4px 6px 0 0;
    background:
        radial-gradient(ellipse at 40% 60%, rgba(244, 197, 66, 0.18) 0%, transparent 55%);
}

/* Accent words within prose */
.middle-voice-verb {
    color: var(--damsel);
    font-style: italic;
    font-weight: 500;
}

.accent-persimmon { color: var(--persimmon); font-weight: 500; }
.accent-citron    { color: #B58A1F; font-weight: 500; background: linear-gradient(transparent 60%, rgba(244, 197, 66, 0.35) 60%); }
.accent-damsel    { color: var(--damsel); font-weight: 500; }
.accent-coral     { color: var(--coral); font-weight: 500; }

/* ============================================================
   Margin pull-quotes (left-margin, rotated -2deg)
   ============================================================ */
.margin-pull {
    position: absolute;
    left: -240px;
    width: 200px;
    font-family: var(--font-body);
    font-style: italic;
    font-size: 13px;
    line-height: 18px;
    color: var(--burgundy-smoke);
    transform: rotate(-2deg);
    transform-origin: top right;
    background-color: var(--vellum-shadow);
    padding: 10px 14px;
    border-left: 2px solid var(--oxblood);
    opacity: 0;
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.margin-pull.is-in {
    opacity: 0.9;
    transform: rotate(-2deg) translateX(0);
}

.pull-1 { top: 96px; }
.pull-2 { top: 290px; }
.pull-3 { top: 510px; }
.pull-4 { top: 160px; }
.pull-5 { top: 160px; }
.pull-6 { top: 160px; }

@media (max-width: 1120px) {
    .margin-pull {
        position: relative;
        left: 0;
        width: auto;
        margin: 24px 0;
        display: block;
    }
}

/* ============================================================
   Chapter footer marginalia
   ============================================================ */
.chapter-footer {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 13px;
    line-height: 20px;
    color: var(--burgundy-smoke);
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid rgba(91, 26, 31, 0.15);
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.chapter-footer.is-in {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================================
   Inventory list (Chapter II)
   ============================================================ */
.middles-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.middle-item {
    position: relative;
    font-family: var(--font-body);
    font-size: 18px;
    line-height: 32px;
    color: var(--oxblood);
    padding: 8px 0 8px 32px;
    cursor: default;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.5s ease-out, transform 0.5s ease-out, color 0.3s ease-out;
}

.middle-item.is-in {
    opacity: 1;
    transform: translateY(0);
}

.middle-item:hover {
    color: var(--mahogany);
}

.bullet {
    position: absolute;
    left: 0;
    top: 50%;
    width: 8px;
    height: 8px;
    margin-top: -4px;
    background-color: var(--oxblood);
    border-radius: 50%;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1),
                background-color 0.4s ease-out,
                box-shadow 0.4s ease-out;
}

.middle-item.is-bloomed .bullet {
    transform: scale(1.5);
    background-color: var(--citron);
    box-shadow:
        0 0 0 3px rgba(244, 197, 66, 0.18),
        0 0 0 6px rgba(244, 197, 66, 0.08);
}

.middle-item.is-bloomed {
    color: var(--mahogany);
}

.middle-text {
    display: inline-block;
}

/* ============================================================
   Footnotes (Chapter IV)
   ============================================================ */
.footnote-marker {
    color: var(--persimmon);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.7em;
    margin-left: 1px;
    padding: 0 2px;
    vertical-align: super;
    cursor: pointer;
    border-bottom: 1px dotted var(--persimmon);
    transition: background-color 0.3s ease-out, color 0.3s ease-out;
}

.footnote-marker:hover,
.footnote-marker.is-active {
    background-color: rgba(255, 106, 43, 0.18);
    color: var(--mahogany);
}

.footnotes {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px dashed rgba(91, 26, 31, 0.25);
}

.footnote {
    font-family: var(--font-body);
    font-size: 13px;
    line-height: 20px;
    color: var(--burgundy-smoke);
    margin-bottom: 12px;
    padding-left: 24px;
    text-indent: -24px;
    opacity: 0.55;
    transition: opacity 0.6s ease-out, color 0.4s ease-out;
}

.footnote.is-active {
    opacity: 1;
    color: var(--oxblood);
}

.fn-num {
    font-family: var(--font-display);
    font-weight: 700;
    color: var(--persimmon);
    margin-right: 6px;
}

/* ============================================================
   Colophon (Chapter X)
   ============================================================ */
.spread-colophon {
    text-align: left;
}

.colophon-block {
    border-top: 1px solid rgba(91, 26, 31, 0.25);
    border-bottom: 1px solid rgba(91, 26, 31, 0.25);
    padding: 32px 0;
    margin-top: 24px;
}

.colophon-line {
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 22px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--oxblood);
    margin-bottom: 8px;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.colophon-line.is-in {
    opacity: 1;
    transform: translateY(0);
}

.colophon-line-final {
    margin-top: 24px;
    color: var(--mahogany);
    font-weight: 500;
}

/* ============================================================
   Ex Libris (Chapter XI)
   ============================================================ */
.spread-exlibris {
    min-height: 80vh;
    padding: 96px 0;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.exlibris-line {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 14px;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--oxblood);
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 1.2s ease-out, transform 1.2s ease-out;
    text-align: center;
}

.exlibris-line.is-in {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================================
   Responsive — collapse decorative margins
   ============================================================ */
@media (max-width: 900px) {
    .volume { padding: 0 24px 64px; }
    .binding-stitch { left: 16px; }
    .folio { right: 16px; }
    .spread { padding: 64px 0; }
    .hero-title { font-size: clamp(56px, 18vw, 120px); }
    .chapter-title { font-size: clamp(28px, 7vw, 44px); }
    .progress-label { min-width: 140px; font-size: 9px; letter-spacing: 0.14em; }
}

@media (max-width: 600px) {
    .progress-strip { padding: 0 16px; }
    .progress-label { min-width: 100px; max-width: 50%; overflow: hidden; text-overflow: ellipsis; }
    .body-prose { font-size: 16px; line-height: 25px; }
}