/* historical.day -- a living palimpsest
   Palette: parchment / iron-gall / oxblood / gold / verdigris
   Built without gradient-as-primary. Texture via blend modes. */

:root {
    --parchment: #f5ecd7;
    --cream-wash: #faf6ee;
    --leather: #3d2b1f;
    --leather-light: #5c3d2e;
    --oxblood: #6b1d1d;
    --oxblood-deep: #4a1515;
    --gold: #c4a35a;
    --gold-deep: #8b6914;
    --foxing: #a89279;
    --foxing-soft: #7a6652;
    --charcoal: #2c2c2c;
    --verdigris: #4a7c6f;

    /* Per-load procedural noise seed */
    --noise-x: 37%;
    --noise-y: 61%;
    --noise-rot: 2deg;

    --font-display: 'Playfair Display', 'Libre Baskerville', Georgia, serif;
    --font-body: 'Crimson Pro', 'Libre Baskerville', Georgia, serif;
    --font-margin: 'Caveat', 'Crimson Pro', cursive;
    --font-slab: 'Libre Baskerville', 'Playfair Display', Georgia, serif;

    --rail-width: 56px;
    --gutter: clamp(1.5rem, 3vw, 3rem);

    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: clamp(1rem, 1.4vw, 1.18rem);
    line-height: 1.75;
    letter-spacing: 0.01em;
    color: var(--charcoal);
    background: var(--parchment);
    background-image:
        radial-gradient(ellipse at var(--noise-x) var(--noise-y), rgba(168, 146, 121, 0.18), transparent 60%),
        radial-gradient(ellipse at calc(100% - var(--noise-x)) calc(100% - var(--noise-y)), rgba(139, 105, 20, 0.10), transparent 65%);
    overflow-x: hidden;
    position: relative;
    padding-left: var(--rail-width);
}

/* ============== FOXING OVERLAY ============== */
.foxing-overlay {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1;
    background-image:
        radial-gradient(circle at 13% 22%, rgba(168, 146, 121, 0.18) 0, transparent 8px),
        radial-gradient(circle at 78% 18%, rgba(168, 146, 121, 0.14) 0, transparent 6px),
        radial-gradient(circle at 38% 64%, rgba(168, 146, 121, 0.16) 0, transparent 10px),
        radial-gradient(circle at 88% 72%, rgba(139, 105, 20, 0.10) 0, transparent 5px),
        radial-gradient(circle at 22% 88%, rgba(168, 146, 121, 0.12) 0, transparent 7px),
        radial-gradient(circle at 60% 8%, rgba(107, 29, 29, 0.04) 0, transparent 9px),
        radial-gradient(circle at 5% 50%, rgba(168, 146, 121, 0.08) 0, transparent 12px),
        radial-gradient(circle at 95% 45%, rgba(168, 146, 121, 0.10) 0, transparent 10px);
    mix-blend-mode: multiply;
    opacity: 0.9;
}

.foxing-overlay::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        repeating-linear-gradient(
            91deg,
            transparent 0,
            transparent 2px,
            rgba(61, 43, 31, 0.025) 2px,
            rgba(61, 43, 31, 0.025) 3px
        );
    mix-blend-mode: multiply;
}

/* ============== TIMELINE RAIL ============== */
.timeline-rail {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--rail-width);
    height: 100vh;
    background: var(--leather);
    background-image:
        linear-gradient(180deg,
            var(--leather) 0%,
            var(--leather-light) 30%,
            var(--leather) 60%,
            var(--leather-light) 90%,
            var(--leather) 100%);
    border-right: 1px solid var(--charcoal);
    box-shadow:
        inset -2px 0 4px rgba(0, 0, 0, 0.4),
        2px 0 14px rgba(0, 0, 0, 0.25);
    z-index: 50;
    overflow: hidden;
}

.rail-foreedge {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(180deg,
            transparent 0%,
            transparent 30%,
            rgba(74, 124, 111, 0.18) 35%,
            rgba(168, 146, 121, 0.14) 50%,
            rgba(107, 29, 29, 0.10) 70%,
            transparent 90%);
    pointer-events: none;
    transform: translateY(0);
    transition: transform 200ms linear;
}

.century-list {
    list-style: none;
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 14px;
    padding: 8px 0;
}

.century-tab {
    position: relative;
    margin: 0 6px;
    padding: 10px 4px;
    background: var(--leather-light);
    border: 1px solid var(--gold-deep);
    border-radius: 2px 6px 6px 2px;
    color: var(--gold);
    font-family: var(--font-slab);
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-align: center;
    cursor: pointer;
    transform-style: preserve-3d;
    perspective: 800px;
    transition: transform 280ms var(--ease-out), background 200ms ease, color 200ms ease, box-shadow 280ms ease;
    box-shadow: inset 0 1px 0 rgba(196, 163, 90, 0.25), 1px 1px 0 rgba(0, 0, 0, 0.3);
}

.century-tab:hover {
    transform: rotateX(var(--tab-tilt-x, 6deg)) rotateY(var(--tab-tilt-y, -4deg)) translateX(2px);
    background: var(--oxblood);
    color: var(--cream-wash);
    box-shadow: inset 0 1px 0 rgba(255, 220, 160, 0.25), 3px 3px 0 rgba(0, 0, 0, 0.35);
}

.century-tab.is-active {
    background: var(--oxblood);
    color: var(--gold);
    animation: tabBounce 600ms var(--ease-spring);
}

@keyframes tabBounce {
    0% { transform: scale(1); }
    50% { transform: scale(1.18); }
    100% { transform: scale(1); }
}

.tab-marker {
    display: block;
    font-variant: all-small-caps;
}

.tab-tooltip {
    position: absolute;
    left: calc(100% + 14px);
    top: 50%;
    transform: translateY(-50%) translateX(-8px);
    background: var(--parchment);
    color: var(--charcoal);
    padding: 6px 10px;
    font-family: var(--font-slab);
    font-size: 0.7rem;
    letter-spacing: 0.14em;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 200ms ease, transform 200ms ease;
    border: 1px solid var(--leather);
    box-shadow: 2px 2px 0 var(--leather);
    z-index: 60;
}

.century-tab:hover .tab-tooltip {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
}

/* ============== CODEX CONTAINER ============== */
.codex {
    position: relative;
    z-index: 2;
}

/* ============== TITLE LEAF ============== */
.title-leaf {
    position: relative;
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: clamp(2rem, 5vw, 5rem) clamp(1rem, 4vw, 4rem);
    background: var(--parchment);
}

.ornamental-border {
    position: absolute;
    inset: clamp(1.5rem, 3vw, 3rem);
    pointer-events: none;
}

.corner {
    position: absolute;
    width: clamp(60px, 8vw, 100px);
    height: clamp(60px, 8vw, 100px);
    transform: scale(0);
    transform-origin: center;
    opacity: 0;
}

.corner-tl { top: 0; left: 0; }
.corner-tr { top: 0; right: 0; }
.corner-bl { bottom: 0; left: 0; }
.corner-br { bottom: 0; right: 0; }

.title-leaf.is-revealed .corner {
    animation: cornerGrow 800ms var(--ease-spring) forwards;
}
.title-leaf.is-revealed .corner-tl { animation-delay: 2400ms; }
.title-leaf.is-revealed .corner-tr { animation-delay: 2600ms; }
.title-leaf.is-revealed .corner-bl { animation-delay: 2800ms; }
.title-leaf.is-revealed .corner-br { animation-delay: 3000ms; }

@keyframes cornerGrow {
    from { transform: scale(0) rotate(-12deg); opacity: 0; }
    to { transform: scale(1) rotate(0); opacity: 1; }
}

.title-block {
    position: relative;
    text-align: center;
    max-width: 880px;
    z-index: 2;
    padding: clamp(2rem, 4vw, 4rem) clamp(1.5rem, 4vw, 4rem);
}

.folio-mark {
    font-family: var(--font-slab);
    font-size: 0.72rem;
    letter-spacing: 0.32em;
    color: var(--foxing-soft);
    text-transform: uppercase;
    margin-bottom: 1.6rem;
}

.site-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 8vw, 6rem);
    font-weight: 700;
    letter-spacing: 0.08em;
    line-height: 1;
    color: var(--charcoal);
    text-shadow: 1px 1px 0 var(--gold);
}

.title-line {
    display: block;
    position: relative;
    overflow: hidden;
}

.title-line::before {
    content: attr(data-text);
    position: absolute;
    inset: 0;
    color: var(--gold);
    -webkit-text-stroke: 0;
    clip-path: inset(100% 0 0 0);
    transition: clip-path 1200ms var(--ease-out);
}

.title-leaf.is-revealed .title-line::before {
    clip-path: inset(0 0 0 0);
    transition-delay: 600ms;
}

.title-leaf.is-revealed .title-line--secondary::before {
    transition-delay: 1200ms;
}

.title-divider {
    display: block;
    width: clamp(140px, 24vw, 220px);
    margin: 1rem auto;
    opacity: 0;
    transform: scaleX(0);
    transform-origin: center;
    transition: opacity 600ms ease, transform 800ms var(--ease-out);
}

.title-leaf.is-revealed .title-divider {
    opacity: 1;
    transform: scaleX(1);
    transition-delay: 1800ms;
}

.title-divider svg {
    display: block;
    width: 100%;
    height: 12px;
}

/* Quill stage */
.quill-stage {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    pointer-events: none;
}

.quill-nib {
    position: absolute;
    top: -260px;
    left: -30px;
    width: 60px;
    height: 200px;
    transform-origin: top center;
    animation: quillDescend 2200ms var(--ease-out) forwards, quillLift 800ms var(--ease-out) forwards;
    animation-delay: 400ms, 3200ms;
}

@keyframes quillDescend {
    0% { transform: translateY(-100vh) rotate(-8deg); opacity: 0; }
    20% { opacity: 1; }
    100% { transform: translateY(0) rotate(0); opacity: 1; }
}

@keyframes quillLift {
    from { transform: translateY(0); opacity: 1; }
    to { transform: translateY(-120vh) rotate(12deg); opacity: 0; }
}

.date-trace {
    display: none;
}

.subtitle {
    font-family: var(--font-slab);
    font-variant: all-small-caps;
    letter-spacing: 0.22em;
    font-size: clamp(0.85rem, 1.4vw, 1.05rem);
    color: var(--leather);
    margin-top: 2.4rem;
    font-weight: 700;
    min-height: 1.8em;
}

.typewriter {
    display: inline;
}

.pilcrow-cursor {
    display: inline-block;
    margin-left: 4px;
    color: var(--oxblood);
    font-family: var(--font-display);
    font-weight: 400;
    animation: pilcrowBlink 800ms steps(1, end) infinite;
}

@keyframes pilcrowBlink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.catalog-no {
    margin-top: 2rem;
    font-family: var(--font-slab);
    font-size: 0.66rem;
    letter-spacing: 0.32em;
    color: var(--foxing-soft);
}

.scroll-hint {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    opacity: 0;
    animation: hintFade 1200ms ease forwards;
    animation-delay: 4400ms;
}

@keyframes hintFade {
    from { opacity: 0; transform: translate(-50%, 12px); }
    to { opacity: 0.7; transform: translate(-50%, 0); }
}

.scroll-hint__label {
    font-family: var(--font-slab);
    font-variant: all-small-caps;
    letter-spacing: 0.28em;
    font-size: 0.7rem;
    color: var(--foxing-soft);
}

.scroll-hint__arrow {
    width: 18px;
    height: 24px;
    animation: arrowDrift 1800ms ease-in-out infinite;
}

@keyframes arrowDrift {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(6px); }
}

/* ============== ERA PREAMBLE ============== */
.era-preamble {
    padding: clamp(4rem, 10vh, 8rem) clamp(2rem, 6vw, 6rem);
    background: var(--cream-wash);
    border-top: 1px solid rgba(61, 43, 31, 0.15);
    border-bottom: 1px solid rgba(61, 43, 31, 0.15);
    text-align: center;
}

.preamble-inner {
    max-width: 720px;
    margin: 0 auto;
}

.era-kicker {
    font-family: var(--font-slab);
    font-variant: all-small-caps;
    letter-spacing: 0.32em;
    font-size: 0.85rem;
    color: var(--oxblood);
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.era-text {
    font-family: var(--font-body);
    font-size: clamp(1.05rem, 1.8vw, 1.3rem);
    line-height: 1.85;
    color: var(--charcoal);
    font-style: italic;
}

.fleuron {
    display: block;
    width: 200px;
    height: 40px;
    margin: 2.4rem auto 0;
    opacity: 0.8;
}

/* ============== CHRONICLE SPREAD ============== */
.chronicle-spread {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 12px 1fr;
    min-height: 90vh;
    padding: clamp(3rem, 8vh, 6rem) clamp(1.5rem, 5vw, 4rem);
    background: var(--parchment);
    overflow: hidden;
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 800ms var(--ease-out), transform 800ms var(--ease-out);
}

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

.chronicle-spread:nth-of-type(odd) {
    background: var(--parchment);
}

.chronicle-spread:nth-of-type(even) {
    background: var(--cream-wash);
}

.chronicle-spread:hover {
    background-color: var(--cream-wash);
}

.chronicle-spread:hover .spread-spine {
    box-shadow: 0 0 14px rgba(196, 163, 90, 0.18);
}

.spread-spine {
    background:
        linear-gradient(90deg,
            var(--leather) 0%,
            var(--leather-light) 35%,
            var(--leather) 50%,
            var(--leather-light) 65%,
            var(--leather) 100%);
    background-size: 100% 12px;
    background-repeat: repeat-y;
    position: relative;
    box-shadow:
        inset 1px 0 2px rgba(0, 0, 0, 0.4),
        inset -1px 0 2px rgba(0, 0, 0, 0.4);
}

.spread-spine::before,
.spread-spine::after {
    content: "";
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 8px;
    height: 8px;
    background: var(--gold);
    border: 1px solid var(--leather);
    border-radius: 50%;
}

.spread-spine::before { top: 16%; }
.spread-spine::after { bottom: 16%; }

.page {
    padding: clamp(1.5rem, 3vw, 3rem) clamp(1.5rem, 3vw, 3rem);
    position: relative;
}

.page-verso {
    border-right: 1px solid rgba(61, 43, 31, 0.12);
}

.page-recto {
    border-left: 1px solid rgba(61, 43, 31, 0.12);
}

/* Page header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 2rem;
    padding-bottom: 0.6rem;
    border-bottom: 1px solid rgba(61, 43, 31, 0.2);
    font-family: var(--font-slab);
    font-variant: all-small-caps;
    letter-spacing: 0.2em;
    font-size: 0.7rem;
    color: var(--foxing-soft);
    font-weight: 700;
}

.folio-number {
    color: var(--oxblood);
}

.page-era {
    color: var(--leather);
    font-style: italic;
    font-variant: normal;
    letter-spacing: 0.14em;
}

.entry-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.6rem, 3vw, 2.4rem);
    line-height: 1.2;
    color: var(--leather);
    margin-bottom: 1.6rem;
    letter-spacing: 0.01em;
    text-shadow: 1px 1px 0 rgba(196, 163, 90, 0.3);
}

.entry-body {
    font-family: var(--font-body);
    font-size: clamp(1rem, 1.4vw, 1.18rem);
    line-height: 1.85;
    color: var(--charcoal);
    text-align: justify;
    hyphens: auto;
}

.entry-body p {
    margin-bottom: 1.1rem;
}

.entry-body p + p {
    text-indent: 2.4em;
}

.entry-body em {
    font-style: italic;
    color: var(--oxblood);
}

/* Lede + illuminated initial */
.lede {
    position: relative;
}

.illuminated-initial {
    float: left;
    width: clamp(80px, 9vw, 110px);
    height: clamp(96px, 11vw, 130px);
    margin: 0.2em 1em 0 0;
    shape-outside: margin-box;
}

.initial-svg {
    width: 100%;
    height: 100%;
}

.vine-group .vine {
    stroke-dasharray: 80;
    stroke-dashoffset: 80;
    transition: stroke-dashoffset 1800ms var(--ease-out);
}

.chronicle-spread.is-visible .vine-group .vine {
    stroke-dashoffset: 0;
}

/* Recto column */
.recto-stack {
    display: flex;
    flex-direction: column;
    gap: 1.6rem;
}

.archival-frame {
    margin: 0;
    padding: 8px;
    background: var(--cream-wash);
    border: 6px solid transparent;
    border-image: repeating-linear-gradient(
        45deg,
        var(--leather) 0 4px,
        var(--gold-deep) 4px 8px,
        var(--leather) 8px 12px
    ) 6;
    box-shadow:
        2px 3px 0 var(--leather),
        inset 0 0 0 1px rgba(196, 163, 90, 0.4);
    position: relative;
}

.frame-art {
    display: block;
    width: 100%;
    height: auto;
    filter: sepia(0.6) contrast(1.1) brightness(0.95) saturate(0.7);
}

.frame-caption {
    margin-top: 0.6rem;
    text-align: center;
    font-family: var(--font-slab);
    font-variant: all-small-caps;
    letter-spacing: 0.18em;
    font-size: 0.7rem;
    color: var(--foxing-soft);
    font-weight: 700;
}

.frame-caption em {
    font-variant: normal;
    letter-spacing: 0.04em;
    color: var(--oxblood);
    font-style: italic;
    font-weight: 400;
}

/* Marginalia */
.marginalia {
    position: relative;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 1rem 1.2rem;
    background: rgba(250, 246, 238, 0.5);
    border-left: 2px solid var(--oxblood);
    transform: rotate(-1deg);
}

.marginalia.margin-right {
    transform: rotate(1deg);
    border-left: none;
    border-right: 2px solid var(--oxblood);
    flex-direction: row-reverse;
}

.manicule {
    flex-shrink: 0;
    width: 60px;
    height: 40px;
    opacity: 0.25;
    transition: opacity 400ms ease;
}

.manicule .manicule-arm,
.manicule .manicule-finger {
    stroke-dasharray: 60;
    stroke-dashoffset: 60;
    transition: stroke-dashoffset 400ms var(--ease-out);
}

.marginalia:hover .manicule {
    opacity: 1;
}

.marginalia:hover .manicule-arm,
.marginalia:hover .manicule-finger {
    stroke-dashoffset: 0;
}

.margin-note {
    font-family: var(--font-margin);
    font-size: clamp(0.95rem, 1.4vw, 1.1rem);
    line-height: 1.5;
    color: var(--foxing-soft);
    opacity: 0.85;
    transition: opacity 400ms ease, transform 400ms var(--ease-out);
}

.marginalia:hover .margin-note {
    opacity: 1;
    transform: translateY(-2px);
}

/* Conservation note */
.conservation-note {
    padding: 1rem 1.2rem;
    background: rgba(168, 146, 121, 0.08);
    border: 1px dashed var(--foxing);
}

.cn-label {
    font-family: var(--font-slab);
    font-variant: all-small-caps;
    letter-spacing: 0.24em;
    font-size: 0.68rem;
    color: var(--leather);
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.cn-body {
    font-family: var(--font-margin);
    font-size: clamp(0.9rem, 1.3vw, 1.05rem);
    line-height: 1.5;
    color: var(--foxing-soft);
    transform: rotate(-0.5deg);
}

.cn-body em {
    font-style: italic;
    color: var(--oxblood);
}

/* ============== SEAL INDEX ============== */
.seal-index {
    background: var(--leather);
    background-image:
        linear-gradient(180deg,
            var(--leather) 0%,
            var(--leather-light) 50%,
            var(--leather) 100%);
    color: var(--cream-wash);
    padding: clamp(4rem, 10vh, 8rem) clamp(2rem, 6vw, 6rem);
    text-align: center;
    position: relative;
    border-top: 4px double var(--gold-deep);
    border-bottom: 4px double var(--gold-deep);
}

.seal-index::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        repeating-linear-gradient(
            45deg,
            transparent 0,
            transparent 14px,
            rgba(196, 163, 90, 0.04) 14px,
            rgba(196, 163, 90, 0.04) 15px
        );
    pointer-events: none;
}

.seal-index__title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.8rem, 3.6vw, 2.8rem);
    color: var(--gold);
    letter-spacing: 0.06em;
    margin-bottom: 1rem;
    text-shadow: 1px 1px 0 var(--oxblood-deep);
    position: relative;
}

.seal-index__lede {
    font-family: var(--font-body);
    font-style: italic;
    font-size: clamp(1rem, 1.5vw, 1.15rem);
    color: var(--parchment);
    max-width: 560px;
    margin: 0 auto 3rem;
    opacity: 0.85;
    position: relative;
}

.seal-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: clamp(1.5rem, 3vw, 2.5rem);
    max-width: 980px;
    margin: 0 auto;
    position: relative;
}

.wax-seal {
    position: relative;
    width: 140px;
    height: 140px;
    margin: 0 auto;
    background: none;
    border: 0;
    cursor: pointer;
    perspective: 800px;
    padding: 0;
    font-family: inherit;
}

.seal-face {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: transform 500ms var(--ease-out);
}

.seal-face--front {
    background: radial-gradient(circle at 35% 30%,
        #8a2727 0%,
        var(--oxblood) 55%,
        var(--oxblood-deep) 100%);
    box-shadow:
        inset 0 2px 6px rgba(255, 200, 200, 0.18),
        inset 0 -3px 8px rgba(0, 0, 0, 0.5),
        0 6px 12px rgba(0, 0, 0, 0.4);
    border: 2px solid var(--oxblood-deep);
}

.seal-face--front::before {
    content: "";
    position: absolute;
    inset: 8px;
    border: 1px dashed rgba(196, 163, 90, 0.4);
    border-radius: 50%;
}

.seal-face--front::after {
    content: "";
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    background: radial-gradient(circle at 50% 50%, transparent 60%, rgba(74, 21, 21, 0.4) 100%);
    pointer-events: none;
    z-index: -1;
}

.seal-monogram {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 900;
    color: var(--gold);
    letter-spacing: 0.04em;
    text-shadow:
        1px 1px 0 rgba(0, 0, 0, 0.5),
        -1px -1px 0 rgba(255, 200, 150, 0.2);
}

.seal-face--back {
    background: var(--parchment);
    color: var(--leather);
    transform: rotateY(180deg);
    border: 2px solid var(--leather);
    box-shadow: inset 0 0 12px rgba(168, 146, 121, 0.3);
    padding: 1rem;
    text-align: center;
}

.seal-back-label {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--oxblood);
    letter-spacing: 0.04em;
}

.seal-back-text {
    font-family: var(--font-slab);
    font-variant: all-small-caps;
    letter-spacing: 0.14em;
    font-size: 0.7rem;
    color: var(--leather);
    margin-top: 0.4rem;
    font-weight: 700;
    line-height: 1.3;
}

.wax-seal.is-flipped .seal-face--front {
    transform: rotateY(180deg);
}

.wax-seal.is-flipped .seal-face--back {
    transform: rotateY(360deg);
}

.wax-seal:hover .seal-face--front {
    box-shadow:
        inset 0 2px 6px rgba(255, 220, 200, 0.22),
        inset 0 -3px 8px rgba(0, 0, 0, 0.55),
        0 8px 18px rgba(196, 163, 90, 0.35);
}

/* ============== COLOPHON ============== */
.colophon {
    background: var(--parchment);
    padding: clamp(4rem, 10vh, 8rem) clamp(2rem, 6vw, 6rem);
    text-align: center;
    border-top: 1px solid var(--leather);
}

.colophon-inner {
    max-width: 640px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.aldus-leaf {
    width: 60px;
    height: 40px;
}

.colophon-text {
    font-family: var(--font-body);
    font-size: clamp(0.95rem, 1.4vw, 1.1rem);
    line-height: 1.85;
    color: var(--leather);
    font-style: italic;
}

.colophon-text em {
    color: var(--oxblood);
    font-weight: 500;
}

.press-mark {
    width: 80px;
    height: 80px;
    opacity: 0.85;
}

.colophon-meta {
    font-family: var(--font-slab);
    font-variant: all-small-caps;
    letter-spacing: 0.28em;
    font-size: 0.66rem;
    color: var(--foxing-soft);
    font-weight: 700;
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
    justify-content: center;
}

/* ============== RESPONSIVE ============== */
@media (max-width: 768px) {
    body {
        padding-left: 0;
    }

    .timeline-rail {
        width: 100vw;
        height: 38px;
        background-image:
            linear-gradient(90deg,
                var(--leather) 0%,
                var(--leather-light) 50%,
                var(--leather) 100%);
        border-right: none;
        border-bottom: 1px solid var(--charcoal);
        z-index: 50;
    }

    .century-list {
        flex-direction: row;
        top: 50%;
        left: 0;
        right: 0;
        justify-content: space-around;
        padding: 0 6px;
        gap: 0;
    }

    .century-tab {
        margin: 0 2px;
        padding: 4px 6px;
        font-size: 0.55rem;
    }

    .tab-tooltip {
        left: 50%;
        top: calc(100% + 8px);
        transform: translateX(-50%) translateY(-4px);
    }

    .century-tab:hover .tab-tooltip {
        transform: translateX(-50%) translateY(0);
    }

    .codex {
        padding-top: 38px;
    }

    .chronicle-spread {
        grid-template-columns: 1fr;
        min-height: auto;
    }

    .spread-spine {
        height: 8px;
        width: 100%;
        background-size: 12px 100%;
    }

    .page-verso,
    .page-recto {
        border: none;
        border-bottom: 1px solid rgba(61, 43, 31, 0.15);
    }

    .recto-stack {
        gap: 1rem;
    }

    .marginalia,
    .marginalia.margin-right {
        flex-direction: row;
        transform: rotate(0);
        border-left: 2px solid var(--oxblood);
        border-right: none;
    }

    .illuminated-initial {
        width: 70px;
        height: 84px;
    }

    .seal-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Print -- because of course it deserves a print stylesheet */
@media print {
    body { background: white; padding-left: 0; }
    .timeline-rail, .foxing-overlay, .scroll-hint { display: none; }
}