/* ============================================================
   historic.quest — Design Language Stylesheet
   A vertical descent through the history of recorded knowledge
   ============================================================ */

:root {
    --vellum-cream: #F5F0E8;
    --foxed-ivory: #EDE4D3;
    --lamp-black: #2C2416;
    --burnt-sienna: #C4956A;
    --faded-cocoa: #8B7355;
    --oxidized-copper: #5B7A6E;
    --parchment-shadow: #D4C9B5;
    --deep-walnut: #3E2F1C;

    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Cormorant Garamond', Georgia, serif;
    --font-annotation: 'IM Fell English', Georgia, serif;
    --font-quote: 'Lora', Georgia, serif;

    --measure: min(680px, 70vw);
    --margin-gutter: max(12%, 2rem);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    background-color: var(--vellum-cream);
    color: var(--lamp-black);
    font-family: var(--font-body);
    min-height: 100vh;
    overflow-x: hidden;
}

/* ============================================================
   THE SPINE — Timeline axis
   ============================================================ */
.spine {
    position: fixed;
    left: 12%;
    top: 0;
    bottom: 0;
    width: 1px;
    background-color: var(--faded-cocoa);
    z-index: 10;
    opacity: 0;
    transition: opacity 0.8s ease-out;
}

.spine.visible {
    opacity: 1;
}

.spine-date {
    position: absolute;
    left: -4px;
    font-family: var(--font-body);
    font-style: italic;
    font-size: 0.75rem;
    color: var(--parchment-shadow);
    white-space: nowrap;
    transform: translateX(-100%) translateX(-10px);
    transition: color 0.4s ease-in-out;
    pointer-events: none;
}

.spine-date.active {
    color: var(--burnt-sienna);
}

/* ============================================================
   PILCROW NAVIGATION
   ============================================================ */
.pilcrow-btn {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--parchment-shadow);
    background-color: var(--vellum-cream);
    color: var(--faded-cocoa);
    font-family: var(--font-display);
    font-size: 1.3rem;
    cursor: pointer;
    z-index: 100;
    transition: color 0.3s ease, border-color 0.3s ease, background-color 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.pilcrow-btn:hover {
    color: var(--deep-walnut);
    border-color: var(--burnt-sienna);
}

.pilcrow-btn.is-open {
    background-color: var(--foxed-ivory);
    color: var(--burnt-sienna);
    border-color: var(--burnt-sienna);
}

.chapter-index {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 90;
    pointer-events: none;
    visibility: hidden;
}

.chapter-index.open {
    pointer-events: auto;
    visibility: visible;
}

.chapter-index-overlay {
    position: absolute;
    inset: 0;
    background-color: var(--burnt-sienna);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.chapter-index.open .chapter-index-overlay {
    opacity: 0.08;
}

.chapter-index-panel {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: 240px;
    max-width: 80vw;
    background-color: var(--vellum-cream);
    border-left: 1px solid var(--parchment-shadow);
    padding: 4rem 1.5rem 2rem;
    transform: translateX(100%);
    transition: transform 0.35s ease-out;
    overflow-y: auto;
}

.chapter-index.open .chapter-index-panel {
    transform: translateX(0);
}

.chapter-list {
    list-style: none;
}

.chapter-list li {
    margin-bottom: 1.25rem;
}

.chapter-link {
    font-family: var(--font-annotation);
    font-style: italic;
    font-size: 0.9rem;
    color: var(--faded-cocoa);
    text-decoration: none;
    transition: color 0.25s ease;
    line-height: 1.4;
    display: block;
}

.chapter-link:hover {
    color: var(--deep-walnut);
}

/* ============================================================
   TITLE PAGE — Opening sequence
   ============================================================ */
.title-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 1;
    padding: 2rem;
}

.site-title {
    font-family: var(--font-display);
    font-weight: 400;
    font-style: italic;
    font-size: clamp(2.5rem, 7vw, 5rem);
    color: var(--burnt-sienna);
    letter-spacing: -0.01em;
    overflow: hidden;
    min-height: 1.2em;
}

.site-title .letter {
    display: inline-block;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.3s ease-out, transform 0.3s ease-out;
}

.site-title .letter.show {
    opacity: 1;
    transform: translateY(0);
}

.site-title .letter.dot {
    color: var(--faded-cocoa);
}

.site-subtitle {
    font-family: var(--font-body);
    font-weight: 400;
    font-style: italic;
    font-size: clamp(0.95rem, 1.8vw, 1.1rem);
    color: var(--faded-cocoa);
    opacity: 0;
    transition: opacity 1s ease-in;
    margin-top: 1.5rem;
    text-align: center;
    max-width: 480px;
    line-height: 1.6;
}

.site-subtitle.visible {
    opacity: 0.8;
}

/* ============================================================
   FOLIO NUMBERS
   ============================================================ */
.folio-number {
    position: absolute;
    top: 1.5rem;
    right: 0;
    font-family: var(--font-body);
    font-variant: small-caps;
    font-size: 0.7rem;
    color: var(--faded-cocoa);
    opacity: 0;
    transition: opacity 0.4s ease;
    letter-spacing: 0.05em;
}

.title-page .folio-number {
    right: 2rem;
    top: 2rem;
}

.folio-number.visible {
    opacity: 1;
}

/* ============================================================
   CODEX — Main content column
   ============================================================ */
.codex {
    max-width: var(--measure);
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
    z-index: 1;
}

/* ============================================================
   EPOCH PLATES
   ============================================================ */
.epoch-plate {
    padding: clamp(4rem, 8vh, 7rem) 0;
    position: relative;
}

.alt-bg {
    background-color: var(--foxed-ivory);
    margin: 0 calc(-1 * (50vw - var(--measure) / 2));
    padding-left: calc(50vw - var(--measure) / 2 + 2rem);
    padding-right: calc(50vw - var(--measure) / 2 + 2rem);
}

/* ============================================================
   WATERMARK NUMERALS
   ============================================================ */
.watermark-numeral {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(10rem, 30vw, 22rem);
    color: var(--parchment-shadow);
    opacity: 0;
    z-index: -1;
    pointer-events: none;
    line-height: 1;
    letter-spacing: -0.03em;
    white-space: nowrap;
    user-select: none;
}

/* ============================================================
   DATE MARKERS
   ============================================================ */
.date-marker {
    font-family: var(--font-body);
    font-style: italic;
    font-size: clamp(0.75rem, 1.2vw, 0.85rem);
    color: var(--burnt-sienna);
    display: block;
    margin-bottom: 0.75rem;
    letter-spacing: 0.04em;
}

/* ============================================================
   EPOCH TITLES — with rubrication animation
   ============================================================ */
.epoch-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2rem, 5vw, 3.5rem);
    color: var(--lamp-black);
    line-height: 1.15;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
    transition: color 0.6s ease-in-out;
}

.epoch-title.rubricated {
    color: var(--burnt-sienna);
}

/* ============================================================
   BODY TEXT
   ============================================================ */
.epoch-body {
    font-family: var(--font-body);
    font-size: clamp(1.05rem, 1.8vw, 1.25rem);
    line-height: 1.75;
    color: var(--lamp-black);
    margin-bottom: 1.5em;
}

.epoch-body + .epoch-body {
    text-indent: 1.5em;
}

/* ============================================================
   DROP CAPITALS
   ============================================================ */
.drop-cap-paragraph::first-letter {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(4rem, 10vw, 8rem);
    float: left;
    line-height: 0.75;
    margin-right: 0.12em;
    margin-top: 0.07em;
    color: var(--burnt-sienna);
    opacity: 0.85;
}

/* ============================================================
   MARGINAL ANNOTATIONS
   ============================================================ */
.marginal-annotation {
    position: absolute;
    width: clamp(120px, 14vw, 180px);
    font-family: var(--font-annotation);
    font-style: italic;
    font-size: clamp(0.7rem, 1.1vw, 0.82rem);
    color: var(--faded-cocoa);
    opacity: 0.6;
    line-height: 1.5;
    pointer-events: none;
}

.left-annotation {
    left: calc(-1 * clamp(140px, 16vw, 200px));
    transform: rotate(-1deg);
    text-align: right;
}

.right-annotation {
    right: calc(-1 * clamp(140px, 16vw, 200px));
    transform: rotate(1deg);
    text-align: left;
}

/* ============================================================
   PULL QUOTES
   ============================================================ */
.pull-quote {
    margin: 2.5rem 0;
    padding: 0 1.5rem;
    position: relative;
    opacity: 0;
    transform: translateX(-20px);
    transition: opacity 0.5s ease-out 0.2s, transform 0.5s ease-out 0.2s;
}

.pull-quote.visible {
    opacity: 1;
    transform: translateX(0);
}

.quote-mark-open,
.quote-mark-close {
    font-family: var(--font-display);
    font-size: 4rem;
    color: var(--burnt-sienna);
    opacity: 0.3;
    position: absolute;
    line-height: 1;
    user-select: none;
    transition: transform 0.5s ease-out;
}

.quote-mark-open {
    left: -0.8rem;
    top: -0.5rem;
    transform: scale(0.8);
}

.quote-mark-close {
    right: -0.2rem;
    bottom: 0.5rem;
    transform: scale(0.8);
}

.pull-quote.visible .quote-mark-open,
.pull-quote.visible .quote-mark-close {
    transform: scale(1);
}

.pull-quote p {
    font-family: var(--font-quote);
    font-weight: 500;
    font-style: italic;
    font-size: clamp(1.4rem, 3vw, 2rem);
    line-height: 1.5;
    color: var(--lamp-black);
}

.pull-quote cite {
    display: block;
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-style: normal;
    font-variant: small-caps;
    text-align: right;
    margin-top: 0.75rem;
    color: var(--faded-cocoa);
}

/* ============================================================
   COLOPHON ORNAMENTS
   ============================================================ */
.colophon-ornament {
    text-align: center;
    font-family: var(--font-annotation);
    font-size: 1.5rem;
    color: var(--faded-cocoa);
    opacity: 0.5;
    margin-top: 2rem;
    user-select: none;
}

/* ============================================================
   CATCHWORDS
   ============================================================ */
.catchword {
    text-align: right;
    font-family: var(--font-annotation);
    font-style: italic;
    font-size: 0.8rem;
    color: var(--faded-cocoa);
    opacity: 0.7;
    margin-top: 1rem;
}

/* ============================================================
   LIGATURE STUDIES
   ============================================================ */
.ligature-study {
    text-align: center;
    padding: clamp(5rem, 10vh, 8rem) 0;
}

.ligature-display {
    font-family: var(--font-display);
    font-weight: 400;
    font-style: italic;
    font-size: clamp(12rem, 50vw, 30rem);
    color: var(--parchment-shadow);
    opacity: 0.25;
    line-height: 0.85;
    margin-bottom: 2rem;
    user-select: none;
    letter-spacing: -0.05em;
}

.ligature-annotation {
    font-family: var(--font-annotation);
    font-size: clamp(0.85rem, 1.4vw, 1rem);
    color: var(--faded-cocoa);
    line-height: 1.7;
    max-width: 520px;
    margin: 0 auto;
    text-align: left;
}

/* ============================================================
   HAIRLINE RULES
   ============================================================ */
.hairline-rule {
    border: none;
    height: 1px;
    background-color: var(--parchment-shadow);
    opacity: 0;
    max-width: var(--measure);
    margin: 0 auto;
    transition: opacity 0.2s ease-out;
}

.hairline-rule.visible {
    opacity: 0.4;
}

/* ============================================================
   FOOTER COLOPHON
   ============================================================ */
.colophon {
    text-align: center;
    padding: 4rem 2rem 6rem;
    max-width: 480px;
    margin: 0 auto;
}

.colophon-ornament-final {
    font-family: var(--font-annotation);
    font-size: 1.2rem;
    color: var(--burnt-sienna);
    opacity: 0.5;
    margin-bottom: 1.5rem;
    letter-spacing: 0.5em;
}

.colophon-text {
    font-family: var(--font-body);
    font-size: 0.85rem;
    color: var(--faded-cocoa);
    font-style: italic;
    line-height: 1.7;
    margin-bottom: 1rem;
}

.colophon-imprint {
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-variant: small-caps;
    color: var(--parchment-shadow);
    letter-spacing: 0.15em;
}

/* ============================================================
   FADE REVEAL — Content entry animation
   ============================================================ */
.fade-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

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

/* ============================================================
   LINKS
   ============================================================ */
a {
    color: var(--oxidized-copper);
    text-decoration: none;
    transition: color 0.25s ease;
}

a:hover {
    color: var(--deep-walnut);
}

/* ============================================================
   RESPONSIVE — Below 768px
   ============================================================ */
@media (max-width: 768px) {
    .spine {
        display: none;
    }

    .codex {
        padding: 0 1.5rem;
        max-width: 90vw;
    }

    .alt-bg {
        margin: 0 -1.5rem;
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }

    .marginal-annotation {
        position: relative;
        left: auto;
        right: auto;
        width: auto;
        transform: none;
        text-align: left;
        display: block;
        margin: 1em 0;
        padding: 0.5em 0;
        border-top: 1px solid var(--parchment-shadow);
        border-bottom: 1px solid var(--parchment-shadow);
        opacity: 0.7;
        font-size: clamp(0.8rem, 2.5vw, 0.9rem);
    }

    .left-annotation,
    .right-annotation {
        transform: none;
    }

    .epoch-plate {
        border-top: 1px solid var(--parchment-shadow);
        padding-top: 2rem;
    }

    .date-marker {
        display: inline-block;
        background-color: var(--foxed-ivory);
        padding: 0.2em 0.6em;
        border-radius: 2px;
        font-size: 0.75rem;
    }

    .alt-bg .date-marker {
        background-color: var(--vellum-cream);
    }

    .watermark-numeral {
        font-size: clamp(6rem, 25vw, 12rem);
    }

    .ligature-display {
        font-size: clamp(8rem, 40vw, 16rem);
    }

    .pilcrow-btn {
        bottom: 1rem;
        right: 1rem;
        width: 38px;
        height: 38px;
        font-size: 1.1rem;
    }

    .folio-number {
        font-size: 0.65rem;
    }
}

@media (max-width: 480px) {
    .epoch-body {
        font-size: 1rem;
    }

    .pull-quote p {
        font-size: 1.2rem;
    }

    .site-title {
        font-size: clamp(2rem, 10vw, 3rem);
    }

    .drop-cap-paragraph::first-letter {
        font-size: clamp(3rem, 15vw, 5rem);
    }
}