/* ============================================================
   historical.day — Styles
   Dark-academia folio spread with skeuomorphic paper textures
   ============================================================ */

:root {
    --burnt-umber: #2C1810;
    --aged-vellum: #F4ECD8;
    --laid-paper: #E8DFD0;
    --venetian-red: #8B3A2F;
    --tooled-gold: #B8924A;
    --foxed-bronze: #7A6652;
    --lamp-shadow: #1A0F09;
    --endpaper-tan: #C4B5A0;
    --dark-text: #3D2B1F;
    --card-dark: #4A3728;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background: var(--aged-vellum);
    color: var(--dark-text);
    font-family: 'Source Serif 4', serif;
    font-size: clamp(1rem, 1.6vw, 1.25rem);
    line-height: 1.75;
    overflow-x: hidden;
}

.svg-defs {
    position: absolute;
    width: 0;
    height: 0;
}

/* ---- Scroll Snap ---- */
#main-scroll {
    scroll-snap-type: y proximity;
}

.section {
    scroll-snap-align: start;
}

/* ---- Bookmark Navigation (Desktop) ---- */
#bookmark-nav {
    position: fixed;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    z-index: 100;
    display: flex;
    flex-direction: column;
    gap: 4px;
    width: 48px;
    transition: width 0.3s ease;
}

#bookmark-nav:hover {
    width: 200px;
}

.bookmark {
    display: flex;
    align-items: center;
    height: 40px;
    padding: 0 12px;
    text-decoration: none;
    overflow: hidden;
    white-space: nowrap;
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), background 0.3s ease;
    border-radius: 0 4px 4px 0;
}

.bookmark:nth-child(1) { background: var(--venetian-red); }
.bookmark:nth-child(2) { background: var(--tooled-gold); }
.bookmark:nth-child(3) { background: var(--foxed-bronze); }
.bookmark:nth-child(4) { background: var(--burnt-umber); }
.bookmark:nth-child(5) { background: var(--endpaper-tan); }
.bookmark:nth-child(6) { background: var(--dark-text); }

.bookmark:hover {
    transform: translateX(12px);
}

.bookmark.active {
    transform: translateX(16px);
    border-bottom: 2px solid var(--tooled-gold);
}

.bookmark-label {
    font-family: 'Zilla Slab', serif;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--aged-vellum);
    writing-mode: horizontal-tb;
    opacity: 0;
    transition: opacity 0.3s ease;
}

#bookmark-nav:hover .bookmark-label {
    opacity: 1;
}

/* ---- Mobile Nav ---- */
.mobile-nav-toggle {
    display: none;
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 200;
    width: 40px;
    height: 40px;
    background: var(--aged-vellum);
    border: 1px solid var(--endpaper-tan);
    border-radius: 4px;
    cursor: pointer;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.mobile-nav-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--burnt-umber);
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.mobile-nav-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--aged-vellum);
    z-index: 150;
    padding: 80px 40px;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.mobile-nav-overlay.open {
    opacity: 1;
}

.mobile-nav-title {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    font-size: 1.8rem;
    color: var(--burnt-umber);
    margin-bottom: 32px;
    border-bottom: 1px solid var(--endpaper-tan);
    padding-bottom: 16px;
}

.mobile-nav-overlay ul {
    list-style: none;
}

.mobile-nav-overlay li {
    margin-bottom: 20px;
}

.mobile-nav-overlay a {
    font-family: 'Source Serif 4', serif;
    font-size: 1.2rem;
    color: var(--dark-text);
    text-decoration: none;
    display: block;
    padding: 8px 0;
    border-bottom: 1px dashed var(--endpaper-tan);
    transition: color 0.3s ease;
}

.mobile-nav-overlay a:hover {
    color: var(--venetian-red);
}

/* ---- Frontispiece Section ---- */
.frontispiece-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: var(--aged-vellum);
    /* Paper noise texture via CSS gradient layers */
    background-image:
        radial-gradient(ellipse at center, transparent 40%, rgba(26,15,9,0.12) 100%),
        repeating-linear-gradient(
            45deg,
            rgba(180,141,87,0.02) 0px,
            transparent 1px,
            transparent 3px
        ),
        repeating-linear-gradient(
            -45deg,
            rgba(180,141,87,0.02) 0px,
            transparent 1px,
            transparent 3px
        );
}

.vignette-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    background: radial-gradient(ellipse at center, transparent 50%, rgba(26,15,9,0.15) 100%);
}

.frontispiece-content {
    text-align: center;
    position: relative;
    z-index: 2;
    max-width: 700px;
    padding: 40px;
}

.ornamental-rule {
    width: 100%;
    max-width: 500px;
    height: auto;
    margin: 0 auto;
    display: block;
}

.ornament-path {
    stroke-dasharray: 600;
    stroke-dashoffset: 600;
}

.ornament-path.drawn {
    animation: drawStroke 2s ease forwards;
}

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

.frontispiece-title {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    font-size: clamp(2.5rem, 6vw, 5.5rem);
    letter-spacing: 0.02em;
    color: var(--burnt-umber);
    margin: 24px 0;
    opacity: 0;
    transform: scale(0.98);
    transition: opacity 1.2s ease, transform 1.2s ease;
}

.frontispiece-title.visible {
    opacity: 1;
    transform: scale(1);
}

.frontispiece-thesis {
    font-family: 'Source Serif 4', serif;
    font-style: italic;
    font-size: 1.15rem;
    color: var(--foxed-bronze);
    margin-top: 24px;
    opacity: 0;
    transition: opacity 1.5s ease 0.6s;
}

.frontispiece-thesis.visible {
    opacity: 1;
}

.hourglass-watermark {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: auto;
    opacity: 0.05;
    pointer-events: none;
}

/* ---- Deckle Edge Dividers ---- */
.deckle-edge {
    width: 100%;
    height: 20px;
    display: block;
}

.deckle-path {
    stroke-dasharray: 3000;
    stroke-dashoffset: 3000;
}

.deckle-path.drawn {
    animation: drawStroke 0.8s ease forwards;
}

/* ---- Chronicle Sections ---- */
.chronicle-section {
    min-height: 100vh;
    padding: 48px 0;
    position: relative;
    background: var(--aged-vellum);
    background-image:
        repeating-linear-gradient(
            0deg,
            rgba(180,141,87,0.04) 0px,
            transparent 0.5px,
            transparent 4px
        );
}

.chronicle-cool {
    background-color: var(--laid-paper);
    background-image:
        repeating-linear-gradient(
            90deg,
            rgba(120,100,80,0.03) 0px,
            transparent 0.5px,
            transparent 3px
        );
}

.chronicle-newsprint {
    background-color: #E2D8C8;
    background-image:
        repeating-linear-gradient(
            0deg,
            rgba(100,80,60,0.04) 0px,
            transparent 0.5px,
            transparent 2.5px
        );
}

/* ---- Folio Spread Layout ---- */
.folio-spread {
    display: grid;
    grid-template-columns: 38% 4% 58%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 48px 48px 48px 80px;
    min-height: 80vh;
}

.marginalia-lane {
    padding-right: 16px;
}

.gutter-fold {
    position: relative;
}

.gutter-fold::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 1px;
    background: linear-gradient(to bottom, transparent, var(--endpaper-tan) 20%, var(--endpaper-tan) 80%, transparent);
    opacity: 0.5;
}

.era-date {
    font-family: 'Zilla Slab', serif;
    font-weight: 600;
    font-size: clamp(0.75rem, 1vw, 0.9rem);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--foxed-bronze);
    margin-bottom: 24px;
}

.vignette-icon {
    width: 48px;
    height: 48px;
    margin: 16px 0;
    display: block;
}

.margin-quote {
    font-family: 'Source Serif 4', serif;
    font-style: italic;
    font-size: 0.95rem;
    color: var(--dark-text);
    border-left: 2px solid var(--venetian-red);
    padding-left: 12px;
    margin: 24px 0 8px;
}

.margin-attribution {
    font-family: 'Zilla Slab', serif;
    font-size: 0.75rem;
    color: var(--foxed-bronze);
    letter-spacing: 0.04em;
}

.narrative-column {
    padding-left: 16px;
}

.era-heading {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    font-size: clamp(2rem, 4vw, 3.5rem);
    letter-spacing: 0.02em;
    color: var(--burnt-umber);
    margin-bottom: 32px;
}

.narrative-body p {
    margin-bottom: 1.5em;
}

/* ---- Progressive Disclosure ---- */
.reveal-zone p {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ---- Drop Caps ---- */
.has-drop-cap {
    position: relative;
}

.drop-cap-wrapper {
    float: left;
    margin-right: 12px;
    margin-bottom: 4px;
    shape-outside: margin-box;
}

.drop-cap-svg {
    width: 70px;
    height: 70px;
    display: block;
}

.drop-cap-letter {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    font-size: 48px;
    fill: var(--venetian-red);
}

.drop-cap-border {
    stroke-dasharray: 320;
    stroke-dashoffset: 320;
}

.drop-cap-border.drawn {
    animation: drawStroke 1.2s ease forwards;
}

.vine-scroll {
    stroke-dasharray: 200;
    stroke-dashoffset: 200;
}

.vine-scroll.drawn {
    animation: drawStroke 1.2s ease 0.3s forwards;
}

/* Gold foil shimmer on hover for interactive elements */
.gold-shimmer {
    position: relative;
    overflow: hidden;
}

.gold-shimmer::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(120deg, transparent 0%, rgba(255,255,255,0.15) 50%, transparent 100%);
    transition: left 0.6s ease;
}

.gold-shimmer:hover::after {
    left: 100%;
}

/* ---- Typewriter Effect ---- */
.typewriter-text {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.85rem;
    color: var(--card-dark);
}

/* ---- Index Section ---- */
.index-section {
    min-height: 100vh;
    padding: 64px 48px 64px 80px;
    background: var(--laid-paper);
    background-image:
        repeating-linear-gradient(
            0deg,
            rgba(196,181,160,0.15) 0px,
            transparent 1px,
            transparent 4px
        ),
        repeating-linear-gradient(
            90deg,
            rgba(196,181,160,0.15) 0px,
            transparent 1px,
            transparent 4px
        );
}

.index-title {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    font-size: clamp(2rem, 4vw, 3rem);
    color: var(--burnt-umber);
    text-align: center;
    margin-bottom: 48px;
}

.card-catalog {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 1000px;
    margin: 0 auto;
    perspective: 800px;
}

.catalog-card {
    height: 280px;
    cursor: pointer;
    outline: none;
}

.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s ease-in-out;
    transform-style: preserve-3d;
}

.catalog-card:hover .card-inner,
.catalog-card:focus .card-inner,
.catalog-card.flipped .card-inner {
    transform: rotateY(180deg);
}

.card-recto,
.card-verso {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border-radius: 6px;
    padding: 24px;
    overflow: hidden;
}

.card-recto {
    background: var(--aged-vellum);
    border: 1px solid var(--endpaper-tan);
    /* Linen texture */
    background-image:
        repeating-linear-gradient(
            0deg,
            rgba(196,181,160,0.1) 0px,
            transparent 1px,
            transparent 3px
        ),
        repeating-linear-gradient(
            90deg,
            rgba(196,181,160,0.1) 0px,
            transparent 1px,
            transparent 3px
        );
}

.card-verso {
    background: var(--endpaper-tan);
    border: 1px solid var(--foxed-bronze);
    transform: rotateY(180deg);
    display: flex;
    align-items: center;
    /* Marbled paper effect */
    background-image:
        radial-gradient(ellipse at 20% 30%, rgba(184,146,74,0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 70%, rgba(122,102,82,0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(196,181,160,0.1) 0%, transparent 70%);
}

.card-verso p {
    font-family: 'Source Serif 4', serif;
    font-style: italic;
    font-size: 0.9rem;
    line-height: 1.7;
    color: var(--dark-text);
}

.card-date {
    font-family: 'Zilla Slab', serif;
    font-weight: 600;
    font-size: 0.8rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--venetian-red);
    display: block;
    margin-bottom: 12px;
}

.card-title {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--burnt-umber);
    margin-bottom: 12px;
}

.card-annotation {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.82rem;
    color: var(--card-dark);
    line-height: 1.6;
}

/* ---- Colophon Section ---- */
.colophon-section {
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--aged-vellum);
    padding: 64px 48px;
}

.colophon-content {
    text-align: center;
    max-width: 600px;
}

.colophon-rule {
    max-width: 400px;
    margin: 0 auto;
}

.colophon-title {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    font-size: 1.8rem;
    letter-spacing: 0.04em;
    color: var(--burnt-umber);
    margin: 24px 0;
}

.colophon-text {
    font-family: 'Source Serif 4', serif;
    font-size: 0.95rem;
    color: var(--foxed-bronze);
    line-height: 1.8;
    margin-bottom: 16px;
}

.printers-mark {
    width: 100px;
    height: auto;
    margin: 32px auto 0;
    display: block;
    opacity: 0.6;
}

/* ---- Responsive ---- */
@media (max-width: 900px) {
    #bookmark-nav {
        display: none;
    }

    .mobile-nav-toggle {
        display: flex;
    }

    .folio-spread {
        grid-template-columns: 1fr;
        padding: 32px 24px;
    }

    .gutter-fold {
        display: none;
    }

    .marginalia-lane {
        padding-right: 0;
        margin-bottom: 24px;
        border-bottom: 1px dashed var(--endpaper-tan);
        padding-bottom: 16px;
    }

    .narrative-column {
        padding-left: 0;
    }

    .card-catalog {
        grid-template-columns: 1fr;
    }

    .catalog-card {
        height: 240px;
    }

    .index-section {
        padding: 48px 24px;
    }
}

@media (max-width: 600px) {
    .frontispiece-title {
        font-size: clamp(1.8rem, 8vw, 3rem);
    }

    .era-heading {
        font-size: clamp(1.5rem, 5vw, 2.5rem);
    }
}