/* ============================================
   daitoua.quest - Taisho-era Editorial Design
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    /* Palette from DESIGN.md */
    --aged-vellum: #F4ECD8;
    --darkened-parchment: #E8DCBE;
    --sumi-ink: #1C1A17;
    --faded-manuscript: #5C5347;
    --imperial-vermillion: #B33A2B;
    --indigo-dye: #264573;
    --oxidized-bronze: #7A6C3A;
    --rice-paper-white: #FFFEF5;
    --paper-age: #C4A97D;
    --mid-parchment: #F0E8D4;

    /* Typography */
    --font-display: 'Shippori Mincho', serif;
    --font-heading: 'Cormorant Garamond', serif;
    --font-body: 'Source Serif 4', serif;
    --font-mono: 'IBM Plex Mono', monospace;

    /* Layout */
    --max-content: 1200px;
    --page-margin: 80px;
    --timeline-width: 40px;
}

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

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

body {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: 1.0625rem;
    line-height: 1.75;
    color: var(--sumi-ink);
    background-color: var(--aged-vellum);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- Paper Texture Overlay --- */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    background:
        radial-gradient(ellipse at 15% 25%, rgba(196, 169, 125, 0.18) 0%, transparent 50%),
        radial-gradient(ellipse at 72% 60%, rgba(196, 169, 125, 0.12) 0%, transparent 45%),
        radial-gradient(ellipse at 40% 80%, rgba(196, 169, 125, 0.15) 0%, transparent 40%),
        radial-gradient(ellipse at 85% 15%, rgba(196, 169, 125, 0.1) 0%, transparent 35%),
        radial-gradient(circle at 55% 40%, rgba(196, 169, 125, 0.08) 0%, transparent 30%);
    opacity: 0.6;
}

body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9998;
    background: linear-gradient(
        to bottom,
        rgba(28, 26, 23, 0.04) 0%,
        transparent 8%,
        transparent 92%,
        rgba(28, 26, 23, 0.06) 100%
    ),
    linear-gradient(
        to right,
        rgba(28, 26, 23, 0.03) 0%,
        transparent 6%,
        transparent 94%,
        rgba(28, 26, 23, 0.03) 100%
    );
}

/* --- Timeline Spine --- */
#timeline-spine {
    position: fixed;
    right: 0;
    top: 0;
    width: var(--timeline-width);
    height: 100vh;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    background: linear-gradient(to right, transparent, rgba(244, 236, 216, 0.95) 30%);
}

#timeline-svg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.timeline-markers {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: space-evenly;
    height: 100%;
    padding: 40px 0;
    z-index: 1;
}

.timeline-year {
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 4px 0;
    transition: all 0.3s ease;
}

.year-label {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    color: var(--faded-manuscript);
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: 0.05em;
    transition: color 0.3s ease, font-weight 0.3s ease;
}

.timeline-year.active .year-label {
    color: var(--imperial-vermillion);
    font-weight: 500;
}

.timeline-year::before {
    content: '';
    position: absolute;
    left: 16px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    border: 1px solid var(--oxidized-bronze);
    background: var(--aged-vellum);
    transition: all 0.3s ease;
}

.timeline-year.active::before {
    background: var(--imperial-vermillion);
    border-color: var(--imperial-vermillion);
}

/* --- Title Card --- */
#title-card {
    position: relative;
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background-color: var(--aged-vellum);
}

.sunburst-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.sunburst-svg {
    position: absolute;
    bottom: -20%;
    right: -20%;
    width: 140%;
    height: 140%;
    opacity: 1;
}

.sunburst-lines line {
    transform-origin: center;
}

.title-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 0 var(--page-margin);
}

.title-kanji {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(4rem, 10vw, 12rem);
    color: var(--sumi-ink);
    letter-spacing: 0.15em;
    line-height: 1.1;
    margin-bottom: 1rem;
    text-shadow: 0 2px 20px rgba(28, 26, 23, 0.05);
}

.title-domain {
    font-family: var(--font-heading);
    font-weight: 300;
    font-size: 1rem;
    letter-spacing: 0.4em;
    text-transform: uppercase;
    color: var(--faded-manuscript);
    margin-bottom: 2.5rem;
}

.title-subtitle {
    font-family: var(--font-heading);
    font-weight: 300;
    font-size: 1.125rem;
    color: var(--faded-manuscript);
    line-height: 1.6;
    max-width: 600px;
    margin: 0 auto 0.75rem;
}

.title-subtitle-jp {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: 0.9375rem;
    color: var(--faded-manuscript);
    opacity: 0.7;
    margin-bottom: 3rem;
}

.scroll-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    animation: pulseDown 2.5s ease-in-out infinite;
}

.scroll-indicator span {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    color: var(--oxidized-bronze);
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

@keyframes pulseDown {
    0%, 100% { opacity: 0.5; transform: translateY(0); }
    50% { opacity: 1; transform: translateY(6px); }
}

/* --- Chapter Sections --- */
.chapter {
    position: relative;
    min-height: 80vh;
    background-color: var(--chapter-bg, var(--aged-vellum));
    padding: 0 var(--page-margin);
    padding-right: calc(var(--page-margin) + var(--timeline-width));
}

.chapter::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--oxidized-bronze), transparent);
    opacity: 0.3;
}

/* --- Chapter Dateline --- */
.chapter-dateline {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 4rem 0 3rem;
    max-width: var(--max-content);
    margin: 0 auto;
    border-bottom: 0.5px solid rgba(122, 108, 58, 0.3);
    margin-bottom: 3rem;
}

.hanko-seal {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
}

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

.dateline-era {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 2.5rem;
    color: var(--sumi-ink);
    line-height: 1.2;
}

.dateline-years {
    font-family: var(--font-heading);
    font-weight: 300;
    font-size: 1.25rem;
    color: var(--faded-manuscript);
}

.dateline-jp {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: 1.125rem;
    color: var(--faded-manuscript);
    opacity: 0.6;
    margin-left: auto;
}

/* --- Magazine Spread Layout --- */
.magazine-spread {
    display: grid;
    grid-template-columns: 60% 5% 35%;
    max-width: var(--max-content);
    margin: 0 auto;
    padding-bottom: 4rem;
}

.primary-column {
    grid-column: 1;
}

.annotation-column {
    grid-column: 3;
    position: relative;
    padding-left: 1.5rem;
}

.annotation-column::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 0.5px;
    background: var(--oxidized-bronze);
    opacity: 0.4;
}

/* --- Primary Column Text --- */
.primary-column p {
    margin-bottom: 1.5rem;
    text-align: justify;
    hyphens: auto;
}

.primary-column p.drop-cap::first-letter {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 4rem;
    float: left;
    line-height: 0.8;
    margin-right: 0.5rem;
    margin-top: 0.15rem;
    color: var(--imperial-vermillion);
}

/* --- Annotation Column --- */
.tategaki-quote {
    margin-bottom: 2rem;
    padding: 1.5rem 0;
    border-left: 2px solid var(--oxidized-bronze);
    padding-left: 1rem;
    opacity: 0;
    transform: translateX(20px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.tategaki-quote.revealed {
    opacity: 1;
    transform: translateX(0);
}

.vertical-text {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-family: var(--font-display);
    font-weight: 400;
    font-size: 1rem;
    color: var(--faded-manuscript);
    opacity: 0.6;
    line-height: 2;
    height: 280px;
    overflow: hidden;
}

.quote-attribution {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--faded-manuscript);
    margin-top: 0.75rem;
    opacity: 0.7;
}

.annotation-card {
    margin-bottom: 2rem;
    padding: 1.25rem;
    background: var(--chapter-bg-deep, var(--darkened-parchment));
    border-radius: 2px;
}

.annotation-meta {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--imperial-vermillion);
    margin-bottom: 0.5rem;
    letter-spacing: 0.02em;
}

.annotation-card p {
    font-family: var(--font-body);
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--faded-manuscript);
}

/* --- Document Inspection Zone --- */
.document-zone {
    max-width: var(--max-content);
    margin: 0 auto;
    padding: 3rem 0 4rem;
    position: relative;
}

.document-zone::before {
    content: '';
    position: absolute;
    top: 0;
    left: -40px;
    right: -40px;
    bottom: 0;
    background:
        repeating-linear-gradient(0deg, transparent, transparent 39px, rgba(122, 108, 58, 0.06) 39px, rgba(122, 108, 58, 0.06) 40px),
        repeating-linear-gradient(90deg, transparent, transparent 39px, rgba(122, 108, 58, 0.06) 39px, rgba(122, 108, 58, 0.06) 40px);
    pointer-events: none;
    z-index: 0;
}

.zone-title {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1.25rem;
    color: var(--faded-manuscript);
    margin-bottom: 2rem;
    position: relative;
    z-index: 1;
    letter-spacing: 0.05em;
}

.document-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    position: relative;
    z-index: 1;
}

/* --- Document Card with 3D Flip --- */
.doc-card {
    perspective: 1200px;
    height: 320px;
    cursor: pointer;
}

.doc-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
}

.doc-card.flipped .doc-card-inner {
    transform: rotateY(180deg);
}

.doc-card-front,
.doc-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem 1.5rem;
    border: 0.5px solid rgba(122, 108, 58, 0.3);
    background: var(--rice-paper-white);
}

.doc-card-back {
    transform: rotateY(180deg);
    justify-content: flex-start;
    padding-top: 2rem;
    overflow-y: auto;
}

.doc-icon {
    width: 80px;
    height: 100px;
    margin-bottom: 1.5rem;
}

.doc-title {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--sumi-ink);
    text-align: center;
    margin-bottom: 0.5rem;
}

.doc-date {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--faded-manuscript);
}

.doc-card-back p {
    font-family: var(--font-body);
    font-size: 0.9375rem;
    line-height: 1.65;
    color: var(--sumi-ink);
    margin-bottom: 1.5rem;
    text-align: left;
}

.doc-source {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    color: var(--faded-manuscript);
    margin-top: auto;
    text-align: left;
    width: 100%;
}

/* --- Map Zones --- */
.map-zone {
    max-width: var(--max-content);
    margin: 0 auto;
    padding: 3rem 0 4rem;
    text-align: center;
}

.map-svg {
    width: 100%;
    max-width: 700px;
    height: auto;
    margin: 0 auto;
    display: block;
}

.map-svg.map-large {
    max-width: 800px;
}

.map-coastline {
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    transition: stroke-dashoffset 2.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.map-svg.animate .map-coastline {
    stroke-dashoffset: 0;
}

.map-point {
    opacity: 0;
    transition: opacity 1s ease 2.5s;
}

.map-svg.animate .map-point {
    opacity: 1;
}

.map-label {
    font-family: var(--font-mono);
    opacity: 0;
    transition: opacity 0.8s ease 2s;
}

.map-svg.animate .map-label {
    opacity: 1;
}

/* --- Epilogue --- */
.epilogue-section {
    background-color: var(--rice-paper-white);
    padding: 6rem var(--page-margin);
    padding-right: calc(var(--page-margin) + var(--timeline-width));
    min-height: 60vh;
}

.epilogue-content {
    max-width: 720px;
    margin: 0 auto;
}

.epilogue-title {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 2rem;
    color: var(--sumi-ink);
    margin-bottom: 2.5rem;
    text-align: center;
}

.epilogue-text {
    margin-bottom: 4rem;
}

.epilogue-text p {
    margin-bottom: 1.5rem;
    text-align: justify;
    hyphens: auto;
}

/* --- Bibliography --- */
.bibliography {
    padding-top: 3rem;
    border-top: 0.5px solid rgba(122, 108, 58, 0.3);
}

.bibliography-title {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1.25rem;
    color: var(--sumi-ink);
    margin-bottom: 1.5rem;
}

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

.bibliography-list li {
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--faded-manuscript);
    margin-bottom: 0.75rem;
    padding-left: 1.5rem;
    text-indent: -1.5rem;
}

.bibliography-list em {
    font-style: italic;
    color: var(--sumi-ink);
}

/* --- Colophon --- */
.colophon {
    max-width: 720px;
    margin: 4rem auto 0;
    padding-top: 2rem;
    border-top: 0.5px solid rgba(122, 108, 58, 0.2);
    text-align: center;
}

.colophon-text {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--faded-manuscript);
    line-height: 1.8;
    opacity: 0.6;
}

/* --- Sunburst Section Divider Animation --- */
.chapter-dateline .hanko-seal {
    opacity: 0;
    transform: scale(0.8) rotate(-10deg);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.chapter.in-view .chapter-dateline .hanko-seal {
    opacity: 1;
    transform: scale(1) rotate(0deg);
}

/* --- Chapter reveal animations --- */
.chapter-dateline {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.chapter.in-view .chapter-dateline {
    opacity: 1;
    transform: translateY(0);
}

/* --- Responsive Design --- */
@media (max-width: 1024px) {
    :root {
        --page-margin: 40px;
    }

    .magazine-spread {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .primary-column {
        grid-column: 1;
    }

    .annotation-column {
        grid-column: 1;
        padding-left: 0;
        border-top: 0.5px solid rgba(122, 108, 58, 0.3);
        padding-top: 2rem;
    }

    .annotation-column::before {
        display: none;
    }

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

    .chapter-dateline {
        flex-wrap: wrap;
    }

    .dateline-jp {
        margin-left: 0;
        flex-basis: 100%;
        margin-top: 0.5rem;
    }

    .vertical-text {
        writing-mode: horizontal-tb;
        text-orientation: initial;
        height: auto;
    }
}

@media (max-width: 768px) {
    :root {
        --page-margin: 20px;
    }

    #timeline-spine {
        display: none;
    }

    .chapter {
        padding-right: var(--page-margin);
    }

    .epilogue-section {
        padding-right: var(--page-margin);
    }

    .document-cards {
        grid-template-columns: 1fr;
    }

    .doc-card {
        height: 280px;
    }

    .dateline-era {
        font-size: 1.75rem;
    }

    .title-kanji {
        font-size: clamp(3rem, 15vw, 8rem);
    }

    .primary-column p.drop-cap::first-letter {
        font-size: 3rem;
    }
}

/* --- Selection style --- */
::selection {
    background: rgba(179, 58, 43, 0.15);
    color: var(--sumi-ink);
}

/* --- Scrollbar styling --- */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--aged-vellum);
}

::-webkit-scrollbar-thumb {
    background: var(--paper-age);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--oxidized-bronze);
}