:root {
    --aged-linen: #F4F0E8;
    --ink-walnut: #2C2418;
    --faded-umber: #7A6E5D;
    --tarnished-brass: #A89F91;
    --dried-sage: #8B9E7C;
    --herbarium-coral: #C4856B;
    --vellum: #EDE8DC;
    --reading-room: #3B3228;
    --font-heading: 'Zilla Slab', Georgia, serif;
    --font-body: 'Source Serif 4', Georgia, serif;
    --font-mono: 'IBM Plex Mono', monospace;
}

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

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

body {
    background-color: var(--aged-linen);
    color: var(--ink-walnut);
    font-family: var(--font-body);
    min-height: 100vh;
    overflow-x: hidden;
}

/* ============================
   CARTOUCHE (Hero Section)
   ============================ */

.cartouche {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background-color: var(--aged-linen);
}

.cartouche-crosshatch {
    position: absolute;
    inset: 0;
    background:
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 10px,
            rgba(122, 110, 93, 0.03) 10px,
            rgba(122, 110, 93, 0.03) 10.5px
        ),
        repeating-linear-gradient(
            -45deg,
            transparent,
            transparent 10px,
            rgba(122, 110, 93, 0.03) 10px,
            rgba(122, 110, 93, 0.03) 10.5px
        );
    pointer-events: none;
}

.leaf-watermark {
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50% 0 50% 0;
    opacity: 0.04;
    background: var(--ink-walnut);
    pointer-events: none;
}

.leaf-watermark--1 {
    top: 10%;
    right: -5%;
    transform: rotate(25deg);
}

.leaf-watermark--2 {
    bottom: 5%;
    left: -8%;
    transform: rotate(-15deg);
    width: 300px;
    height: 300px;
}

.cartouche-frame {
    text-align: center;
    padding: 4rem 5rem;
    position: relative;
    z-index: 1;
    background:
        repeating-linear-gradient(
            0deg,
            transparent 0px,
            transparent 8px,
            var(--tarnished-brass) 8px,
            var(--tarnished-brass) 8.5px,
            transparent 8.5px,
            transparent 12px,
            var(--tarnished-brass) 12px,
            var(--tarnished-brass) 12.5px
        ) 0 0 / 100% 13px no-repeat,
        repeating-linear-gradient(
            0deg,
            transparent 0px,
            transparent 8px,
            var(--tarnished-brass) 8px,
            var(--tarnished-brass) 8.5px,
            transparent 8.5px,
            transparent 12px,
            var(--tarnished-brass) 12px,
            var(--tarnished-brass) 12.5px
        ) 0 100% / 100% 13px no-repeat,
        repeating-linear-gradient(
            90deg,
            transparent 0px,
            transparent 8px,
            var(--tarnished-brass) 8px,
            var(--tarnished-brass) 8.5px,
            transparent 8.5px,
            transparent 12px,
            var(--tarnished-brass) 12px,
            var(--tarnished-brass) 12.5px
        ) 0 0 / 13px 100% no-repeat,
        repeating-linear-gradient(
            90deg,
            transparent 0px,
            transparent 8px,
            var(--tarnished-brass) 8px,
            var(--tarnished-brass) 8.5px,
            transparent 8.5px,
            transparent 12px,
            var(--tarnished-brass) 12px,
            var(--tarnished-brass) 12.5px
        ) 100% 0 / 13px 100% no-repeat;
}

.cartouche-border-outer {
    position: absolute;
    inset: -16px;
    border: 1px solid var(--tarnished-brass);
    opacity: 0.3;
    pointer-events: none;
}

.cartouche-greek-key {
    position: absolute;
    inset: -8px;
    border: 1px solid var(--tarnished-brass);
    opacity: 0.5;
    pointer-events: none;
    background:
        repeating-linear-gradient(
            90deg,
            var(--tarnished-brass) 0px,
            var(--tarnished-brass) 6px,
            transparent 6px,
            transparent 12px
        ) 0 0 / 100% 1px no-repeat,
        repeating-linear-gradient(
            90deg,
            var(--tarnished-brass) 0px,
            var(--tarnished-brass) 6px,
            transparent 6px,
            transparent 12px
        ) 0 100% / 100% 1px no-repeat;
}

.cartouche-title {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: clamp(2.2rem, 5vw, 4.2rem);
    letter-spacing: 0.02em;
    color: var(--ink-walnut);
    clip-path: inset(0 100% 0 0);
    animation: clipReveal 1.2s cubic-bezier(0.65, 0, 0.35, 1) 0.5s forwards;
    line-height: 1.1;
}

.cartouche-tld {
    font-weight: 400;
    color: var(--faded-umber);
}

.cartouche-subtitle {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--faded-umber);
    margin-top: 1.5rem;
    min-height: 1.2em;
}

.cartouche-subtitle .cursor {
    display: inline-block;
    width: 0.5em;
    height: 1em;
    background-color: var(--faded-umber);
    vertical-align: text-bottom;
    animation: cursorBlink 0.7s step-end infinite;
    margin-left: 1px;
}

@keyframes clipReveal {
    to { clip-path: inset(0 0% 0 0); }
}

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

.fern-svg {
    position: absolute;
    bottom: 0;
    left: 2rem;
    width: 120px;
    height: 250px;
    opacity: 0.35;
    z-index: 0;
}

.fern-stem {
    stroke-dasharray: 600;
    stroke-dashoffset: 600;
    animation: drawStroke 3s ease-out 0.8s forwards;
}

.fern-frond {
    stroke-dasharray: 300;
    stroke-dashoffset: 300;
}

.fern-frond--1  { animation: drawStroke 1.8s ease-out 1.2s forwards; }
.fern-frond--2  { animation: drawStroke 1.8s ease-out 1.4s forwards; }
.fern-frond--3  { animation: drawStroke 1.8s ease-out 1.6s forwards; }
.fern-frond--4  { animation: drawStroke 1.8s ease-out 1.8s forwards; }
.fern-frond--5  { animation: drawStroke 1.8s ease-out 2.0s forwards; }
.fern-frond--6  { animation: drawStroke 1.8s ease-out 2.2s forwards; }
.fern-frond--7  { animation: drawStroke 1.6s ease-out 2.4s forwards; }
.fern-frond--8  { animation: drawStroke 1.6s ease-out 2.5s forwards; }
.fern-frond--9  { animation: drawStroke 1.4s ease-out 2.6s forwards; }
.fern-frond--10 { animation: drawStroke 1.4s ease-out 2.7s forwards; }
.fern-frond--11 { animation: drawStroke 1.2s ease-out 2.8s forwards; }
.fern-frond--12 { animation: drawStroke 1.0s ease-out 2.9s forwards; }

.fern-fiddlehead {
    stroke-dasharray: 40;
    stroke-dashoffset: 40;
    animation: drawStroke 1.5s ease-out 3.0s forwards;
}

@keyframes drawStroke {
    to { stroke-dashoffset: 0; }
}

/* ============================
   DASHBOARD LAYOUT
   ============================ */

.dashboard {
    display: grid;
    grid-template-columns: 1fr 280px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 64px;
    gap: 3rem;
    position: relative;
}

.reading-pane {
    padding: clamp(4rem, 6vh, 8rem) 0;
}

/* ============================
   REFERENCE SHELF
   ============================ */

.reference-shelf {
    position: sticky;
    top: 2rem;
    height: fit-content;
    max-height: calc(100vh - 4rem);
    overflow: hidden;
    padding: 4rem 0;
}

.shelf-crosshatch {
    position: absolute;
    inset: 0;
    background:
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 8px,
            rgba(122, 110, 93, 0.03) 8px,
            rgba(122, 110, 93, 0.03) 8.5px
        ),
        repeating-linear-gradient(
            -45deg,
            transparent,
            transparent 8px,
            rgba(122, 110, 93, 0.03) 8px,
            rgba(122, 110, 93, 0.03) 8.5px
        );
    pointer-events: none;
    z-index: 0;
}

.shelf-panel {
    position: absolute;
    top: 4rem;
    left: 0;
    right: 0;
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.shelf-panel.active {
    opacity: 1;
    pointer-events: auto;
    position: relative;
    top: 0;
}

.shelf-item {
    padding: 1rem 0;
    position: relative;
    z-index: 1;
}

.shelf-illustration {
    width: 120px;
    height: 120px;
    display: block;
    margin: 0 auto 0.75rem;
}

.shelf-caption {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--tarnished-brass);
    display: block;
    text-align: center;
}

.shelf-quote {
    font-family: var(--font-body);
    font-weight: 400;
    font-style: italic;
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--faded-umber);
    padding-left: 1rem;
    border-left: 2px solid var(--dried-sage);
}

.shelf-cite {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-style: normal;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--tarnished-brass);
    display: block;
    text-align: right;
    margin-top: 0.5rem;
}

.shelf-date-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--tarnished-brass);
    display: block;
    margin-bottom: 0.25rem;
}

.shelf-date {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.4rem;
    color: var(--ink-walnut);
    display: block;
    letter-spacing: 0.02em;
}

.shelf-era {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 0.85rem;
    color: var(--faded-umber);
    display: block;
    margin-top: 0.25rem;
}

/* ============================
   SPECIMEN CARDS
   ============================ */

.specimen-card {
    background-color: var(--vellum);
    border: 1px solid var(--tarnished-brass);
    padding: 2.5rem 2.5rem;
    position: relative;
    overflow: hidden;
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1),
                box-shadow 0.4s cubic-bezier(0.34, 1.56, 0.64, 1),
                border-color 0.3s ease;
    box-shadow: 0 2px 4px rgba(44, 36, 24, 0.06);
}

.specimen-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 32px rgba(44, 36, 24, 0.12),
                inset 0 0 40px rgba(244, 240, 232, 0.4);
    border-color: var(--herbarium-coral);
}

.card-dot-pattern {
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle, rgba(168, 159, 145, 0.08) 1px, transparent 1px);
    background-size: 16px 16px;
    pointer-events: none;
}

.card-guilloche {
    position: absolute;
    left: 0;
    right: 0;
    height: 6px;
    background: repeating-linear-gradient(
        90deg,
        transparent 0px,
        transparent 2px,
        var(--tarnished-brass) 2px,
        var(--tarnished-brass) 4px,
        transparent 4px,
        transparent 8px
    );
    opacity: 0.2;
    pointer-events: none;
}

.card-guilloche--top {
    top: 0;
    background:
        repeating-linear-gradient(
            90deg,
            transparent 0px,
            transparent 3px,
            var(--tarnished-brass) 3px,
            var(--tarnished-brass) 3.5px,
            transparent 3.5px,
            transparent 6px
        ),
        repeating-linear-gradient(
            90deg,
            transparent 1.5px,
            transparent 4.5px,
            rgba(168, 159, 145, 0.4) 4.5px,
            rgba(168, 159, 145, 0.4) 5px,
            transparent 5px,
            transparent 7.5px
        );
    background-size: 6px 3px, 8px 3px;
    background-position: 0 0, 0 3px;
    height: 6px;
    opacity: 0.3;
}

.card-guilloche--bottom {
    bottom: 0;
    background:
        repeating-linear-gradient(
            90deg,
            transparent 0px,
            transparent 3px,
            var(--tarnished-brass) 3px,
            var(--tarnished-brass) 3.5px,
            transparent 3.5px,
            transparent 6px
        ),
        repeating-linear-gradient(
            90deg,
            transparent 1.5px,
            transparent 4.5px,
            rgba(168, 159, 145, 0.4) 4.5px,
            rgba(168, 159, 145, 0.4) 5px,
            transparent 5px,
            transparent 7.5px
        );
    background-size: 6px 3px, 8px 3px;
    background-position: 0 0, 0 3px;
    height: 6px;
    opacity: 0.3;
}

.card-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--tarnished-brass);
    display: block;
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
}

.card-heading {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: clamp(1.5rem, 3vw, 2.2rem);
    letter-spacing: 0.02em;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: var(--ink-walnut);
    position: relative;
    z-index: 1;
}

.card-body {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(1rem, 1.15vw, 1.2rem);
    line-height: 1.72;
    color: var(--ink-walnut);
    max-width: 38em;
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
}

.card-body:last-of-type {
    margin-bottom: 1rem;
}

.card-ref {
    font-family: var(--font-body);
    font-size: 0.85rem;
    color: var(--faded-umber);
    font-style: italic;
    display: block;
    margin-top: 0.5rem;
    position: relative;
    z-index: 1;
}

.ornamental-bracket {
    font-style: normal;
    color: var(--tarnished-brass);
    font-family: var(--font-body);
}

.mono {
    font-family: var(--font-mono);
    font-style: normal;
    font-size: 0.8rem;
    letter-spacing: 0.04em;
}

/* ============================
   DIAMOND RULE DIVIDER
   ============================ */

.diamond-rule {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: clamp(2rem, 4vh, 4rem) 0;
    gap: 0;
}

.rule-line {
    display: block;
    width: 80px;
    height: 1px;
    background-color: var(--tarnished-brass);
}

.rule-diamond {
    display: block;
    width: 8px;
    height: 8px;
    border: 1px solid var(--tarnished-brass);
    transform: rotate(45deg);
    flex-shrink: 0;
    margin: 0 8px;
}

/* ============================
   COMPASS ROSE PAUSE
   ============================ */

.compass-pause {
    display: flex;
    justify-content: center;
    padding: 3rem 0;
}

.compass-rose {
    width: 48px;
    height: 48px;
}

/* ============================
   SCROLL REVEAL
   ============================ */

.fade-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* ============================
   INDEX SECTION (Card Catalogue)
   ============================ */

.index-section {
    padding: clamp(4rem, 8vh, 8rem) 64px;
    max-width: 1200px;
    margin: 0 auto;
    overflow: hidden;
}

.index-heading {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: clamp(1.8rem, 4vw, 3rem);
    letter-spacing: 0.02em;
    color: var(--ink-walnut);
    text-align: center;
    margin-bottom: 0.5rem;
}

.index-subheading {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--tarnished-brass);
    text-align: center;
    margin-bottom: 3rem;
}

.index-track {
    display: flex;
    gap: 1.5rem;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    padding: 2rem 0.5rem 2rem;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--tarnished-brass) transparent;
}

.index-track::-webkit-scrollbar {
    height: 4px;
}

.index-track::-webkit-scrollbar-track {
    background: transparent;
}

.index-track::-webkit-scrollbar-thumb {
    background-color: var(--tarnished-brass);
    border-radius: 2px;
}

.index-card {
    flex: 0 0 280px;
    scroll-snap-align: start;
    background-color: var(--vellum);
    border: 1px solid var(--tarnished-brass);
    border-radius: 4px;
    padding: 2rem 1.5rem;
    position: relative;
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1),
                box-shadow 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 2px 4px rgba(44, 36, 24, 0.06);
    background-image:
        radial-gradient(circle, rgba(168, 159, 145, 0.06) 1px, transparent 1px);
    background-size: 12px 12px;
}

.index-card--odd {
    transform: rotate(-1deg);
}

.index-card--even {
    transform: rotate(1deg);
}

.index-card:hover {
    transform: rotate(0deg) translateY(-6px);
    box-shadow: 0 12px 32px rgba(44, 36, 24, 0.12);
}

.index-card-tab {
    position: absolute;
    top: -1px;
    right: 1.5rem;
    background-color: var(--herbarium-coral);
    color: var(--aged-linen);
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.85rem;
    padding: 0.15rem 0.6rem 0.3rem;
    border-radius: 0 0 3px 3px;
    letter-spacing: 0.02em;
}

.index-card-title {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: 0.02em;
    color: var(--ink-walnut);
    margin-bottom: 0.75rem;
    margin-top: 0.5rem;
}

.index-card-text {
    font-family: var(--font-body);
    font-size: 0.9rem;
    line-height: 1.65;
    color: var(--faded-umber);
    margin-bottom: 1rem;
}

.index-card-ref {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--tarnished-brass);
}

/* ============================
   COLOPHON
   ============================ */

.colophon {
    text-align: center;
    padding: 6rem 2rem;
    max-width: 100%;
    background-color: var(--reading-room);
    position: relative;
}

.colophon-vignette {
    width: 64px;
    height: 64px;
    margin: 0 auto 2rem;
    display: block;
}

.colophon-title {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.3rem;
    letter-spacing: 0.04em;
    color: var(--tarnished-brass);
    margin-bottom: 1rem;
}

.colophon-rule {
    width: 60px;
    height: 1px;
    background-color: var(--tarnished-brass);
    margin: 0 auto 1.5rem;
    opacity: 0.5;
}

.colophon-text {
    font-family: var(--font-body);
    font-size: 0.85rem;
    color: var(--tarnished-brass);
    line-height: 1.8;
    max-width: 320px;
    margin: 0 auto;
}

.colophon-coda {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 0.9rem;
    color: var(--faded-umber);
    margin-top: 2rem;
    opacity: 0.7;
}

/* ============================
   RESPONSIVE: TABLET
   ============================ */

@media (max-width: 768px) {
    .dashboard {
        display: flex;
        flex-direction: column;
        padding: 0 2rem;
    }

    .reading-pane {
        flex: 1;
    }

    .reference-shelf {
        position: static;
        max-height: none;
        overflow: visible;
        padding: 2rem 0;
    }

    .shelf-panel {
        position: relative;
        top: 0;
        opacity: 1;
        pointer-events: auto;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 1.5rem;
    }

    .shelf-panel:not(:first-of-type) {
        display: none;
    }

    .shelf-item {
        flex: 1 1 45%;
        min-width: 180px;
    }

    .fern-svg {
        width: 80px;
        height: 165px;
    }

    .index-section {
        padding-left: 2rem;
        padding-right: 2rem;
    }

    .cartouche-frame {
        padding: 3rem;
    }

    .leaf-watermark {
        width: 200px;
        height: 200px;
    }
}

/* ============================
   RESPONSIVE: MOBILE
   ============================ */

@media (max-width: 480px) {
    .dashboard {
        padding: 0 1rem;
    }

    .specimen-card {
        padding: 1.5rem;
    }

    .specimen-card:hover {
        transform: none;
        box-shadow: 0 2px 4px rgba(44, 36, 24, 0.06);
    }

    .specimen-card:active {
        transform: translateY(2px);
        border-color: var(--herbarium-coral);
    }

    .card-body {
        font-size: 1rem;
    }

    .cartouche-frame {
        padding: 2rem 1.5rem;
    }

    .cartouche-title {
        font-size: clamp(1.8rem, 8vw, 2.8rem);
    }

    .shelf-item {
        flex: 1 1 100%;
    }

    .fern-svg {
        width: 60px;
        height: 125px;
        left: 1rem;
    }

    .leaf-watermark {
        display: none;
    }

    .index-section {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .index-card {
        flex: 0 0 260px;
    }

    .colophon {
        padding: 4rem 1.5rem;
    }
}