/* ============================================
   heisei.day — Editorial Journal Stylesheet
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    --washi-white: #F6F1EA;
    --aged-linen: #EDE5D8;
    --sumi-ink: #1C1714;
    --warm-charcoal: #3A3530;
    --faded-graphite: #7A746C;
    --aged-terracotta: #9C6B4A;
    --matcha-moss: #6B7A5C;
    --paper-edge: #D4CBBD;
    --kinari-gold: #C4A96A;
    --warm-highlight: #F0E8DC;
    --vignette-dark: rgba(28, 23, 20, 0.15);
    --shadow-subtle: 0 1px 3px rgba(28, 23, 20, 0.06), 0 4px 12px rgba(28, 23, 20, 0.03);
    --baseline: 28px;
    --font-heading: 'Playfair Display', Georgia, 'Times New Roman', serif;
    --font-body: 'Source Serif 4', 'Source Serif Pro', Georgia, serif;
    --font-marginalia: 'Noto Sans JP', 'Helvetica Neue', Arial, sans-serif;
    --font-accent: 'Cormorant Garamond', 'Garamond', 'Times New Roman', serif;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    background-color: var(--washi-white);
}

body {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(1rem, 1.15vw, 1.125rem);
    line-height: 1.78;
    color: var(--warm-charcoal);
    background-color: var(--washi-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* --- SVG Filters (hidden) --- */
.svg-filters {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
}

/* --- Running Header --- */
#running-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 8px;
    height: 40px;
    background: rgba(246, 241, 234, 0.95);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    padding: 0 40px;
    z-index: 100;
    border-bottom: 1px solid var(--paper-edge);
    opacity: 0;
    transform: translateY(-100%);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

#running-header.visible {
    opacity: 1;
    transform: translateY(0);
}

#running-header-text {
    font-family: var(--font-marginalia);
    font-weight: 300;
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--faded-graphite);
}

/* --- Chapter Navigation --- */
#chapter-nav {
    position: fixed;
    left: 24px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 20px;
    z-index: 90;
    opacity: 0;
    transition: opacity 0.6s ease;
}

#chapter-nav.visible {
    opacity: 1;
}

.chapter-link {
    font-family: var(--font-accent);
    font-weight: 300;
    font-style: italic;
    font-size: 0.9rem;
    color: var(--faded-graphite);
    text-decoration: none;
    transition: color 0.3s ease;
    position: relative;
    padding-left: 12px;
}

.chapter-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: transparent;
    transform: translateY(-50%);
    transition: background 0.3s ease;
}

.chapter-link.active {
    color: var(--kinari-gold);
}

.chapter-link.active::before {
    background: var(--kinari-gold);
}

.chapter-link:hover {
    color: var(--aged-terracotta);
}

/* --- Deckle Edge --- */
#deckle-edge {
    position: fixed;
    top: 0;
    right: 0;
    width: 8px;
    height: 100vh;
    z-index: 95;
    background: repeating-linear-gradient(
        to bottom,
        var(--paper-edge) 0px,
        var(--paper-edge) 1px,
        var(--washi-white) 1px,
        var(--washi-white) 3px,
        var(--paper-edge) 3px,
        var(--paper-edge) 5px,
        var(--washi-white) 5px,
        var(--washi-white) 8px,
        var(--paper-edge) 8px,
        var(--paper-edge) 9px,
        var(--washi-white) 9px,
        var(--washi-white) 14px,
        var(--paper-edge) 14px,
        var(--paper-edge) 15px,
        var(--washi-white) 15px,
        var(--washi-white) 17px,
        var(--paper-edge) 17px,
        var(--paper-edge) 19px,
        var(--washi-white) 19px,
        var(--washi-white) 24px
    );
}

/* ============================================
   HERO SECTION
   ============================================ */
#hero {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-image-wrapper {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.hero-image {
    position: absolute;
    inset: -20%;
    width: 140%;
    height: 140%;
    background:
        linear-gradient(135deg,
            #2A2420 0%, #3A3530 20%, #5A5248 40%, #7A746C 55%,
            #9C6B4A 65%, #8A7A6A 75%, #6B7A5C 85%, #4A5A3C 100%
        );
    background-size: cover;
    filter: saturate(0.7);
    will-change: transform;
}

.grain-overlay {
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23g)' opacity='0.04'/%3E%3C/svg%3E");
    background-repeat: repeat;
    pointer-events: none;
    z-index: 1;
}

.vignette {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at center, transparent 50%, var(--vignette-dark) 100%);
    pointer-events: none;
    z-index: 2;
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    will-change: transform;
}

.hero-title {
    font-family: var(--font-heading);
    font-weight: 900;
    font-size: clamp(3rem, 8vw, 6rem);
    color: var(--washi-white);
    letter-spacing: -0.03em;
    text-shadow: 0 2px 40px rgba(28, 23, 20, 0.4);
    margin-bottom: 16px;
}

.hero-subtitle {
    font-family: var(--font-marginalia);
    font-weight: 300;
    font-size: 1rem;
    letter-spacing: 0.2em;
    color: rgba(246, 241, 234, 0.8);
    text-shadow: 0 1px 12px rgba(28, 23, 20, 0.3);
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
}

.scroll-line {
    display: block;
    width: 1px;
    height: 24px;
    background: var(--faded-graphite);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; transform: scaleY(0.5); transform-origin: top; }
    50% { opacity: 1; transform: scaleY(1); transform-origin: top; }
}

/* ============================================
   CHAPTER SECTIONS
   ============================================ */
.chapter {
    position: relative;
    padding: 112px 40px 84px;
    max-width: 1280px;
    margin: 0 auto;
}

.chapter-heading {
    margin-bottom: 56px;
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.chapter-heading.visible {
    opacity: 1;
    transform: translateY(0);
}

.chapter-numeral {
    display: block;
    font-family: var(--font-accent);
    font-weight: 300;
    font-style: italic;
    font-size: clamp(4rem, 10vw, 12rem);
    color: var(--aged-terracotta);
    line-height: 0.85;
    margin-bottom: 16px;
}

.chapter-title {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: clamp(1.4rem, 2.5vw, 2rem);
    letter-spacing: -0.02em;
    color: var(--sumi-ink);
    line-height: 1.3;
}

.chapter-title-en {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: clamp(1.2rem, 2vw, 1.6rem);
    color: var(--faded-graphite);
}

/* --- Magazine Spread (7 + 5 grid) --- */
.magazine-spread {
    display: grid;
    grid-template-columns: 7fr 5fr;
    gap: 56px;
}

/* --- Verso (main content) --- */
.verso {
    position: relative;
}

.verso p {
    margin-bottom: var(--baseline);
    text-align: justify;
    hyphens: auto;
    -webkit-hyphens: auto;
}

.verso p em {
    font-style: italic;
    font-weight: 600;
}

/* --- Drop Cap --- */
.drop-cap-paragraph::first-letter {
    float: left;
    font-family: var(--font-heading);
    font-weight: 900;
    font-size: 5em;
    line-height: 0.8;
    padding-right: 12px;
    padding-top: 6px;
    color: var(--sumi-ink);
    text-shadow: 0 0 40px rgba(156, 107, 74, 0.15);
}

/* --- Pull Quotes --- */
.pull-quote {
    margin: 56px 0;
    margin-right: -30%;
    padding: 28px 0;
    border-top: 1px solid var(--paper-edge);
    border-bottom: 1px solid var(--paper-edge);
}

.pull-quote p {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: clamp(1.4rem, 2.5vw, 2rem);
    line-height: 1.45;
    color: var(--sumi-ink);
    letter-spacing: -0.01em;
    text-align: left;
    margin-bottom: 12px;
}

.pull-quote cite {
    display: block;
    font-family: var(--font-marginalia);
    font-weight: 300;
    font-size: 0.8rem;
    color: var(--faded-graphite);
    font-style: normal;
    letter-spacing: 0.05em;
}

/* --- Recto / Marginalia --- */
.recto {
    padding-top: 8px;
    border-left: 1px solid var(--paper-edge);
    padding-left: 28px;
}

.marginalia-block {
    margin-bottom: var(--baseline);
    padding-bottom: var(--baseline);
    border-bottom: 1px solid rgba(212, 203, 189, 0.5);
}

.marginalia-block:last-child {
    border-bottom: none;
}

.marginalia-label {
    display: block;
    font-family: var(--font-marginalia);
    font-weight: 400;
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--aged-terracotta);
    margin-bottom: 6px;
}

.marginalia-text {
    font-family: var(--font-marginalia);
    font-weight: 300;
    font-size: 0.8rem;
    line-height: 1.5;
    color: var(--faded-graphite);
}

/* --- Footnote References --- */
.footnote-ref {
    cursor: pointer;
    position: relative;
}

.footnote-ref .marginalia-text {
    background: var(--aged-linen);
    padding: 12px;
    border-left: 3px solid var(--aged-terracotta);
    border-radius: 0 2px 2px 0;
}

/* ============================================
   CHAPTER DIVIDERS
   ============================================ */
.chapter-divider {
    position: relative;
    width: 100%;
    height: 80vh;
    min-height: 500px;
    overflow: hidden;
}

.divider-image {
    position: absolute;
    inset: -10%;
    width: 120%;
    height: 120%;
    filter: saturate(0.7);
    will-change: transform, clip-path;
    clip-path: inset(10% 0);
    transition: clip-path 0.8s cubic-bezier(0.25, 0.1, 0.25, 1.0);
}

.divider-image.revealed {
    clip-path: inset(0% 0);
}

/* Season-specific backgrounds using CSS gradients */
.divider-summer {
    background: linear-gradient(
        160deg,
        #2A2420 0%, #3A4A30 15%, #5A6A48 30%, #7A8A5C 45%,
        #6B7A5C 55%, #8A9A6C 65%, #4A5A38 80%, #2A3420 100%
    );
}

.divider-autumn {
    background: linear-gradient(
        145deg,
        #2A2420 0%, #5A3A28 15%, #8A5A3A 30%, #9C6B4A 45%,
        #C4A96A 55%, #8A6A4A 70%, #5A4A38 85%, #2A2420 100%
    );
}

.divider-winter {
    background: linear-gradient(
        170deg,
        #3A3530 0%, #5A5650 15%, #8A8680 30%, #D4CBBD 45%,
        #EDE5D8 55%, #C4BEB6 70%, #7A746C 85%, #3A3530 100%
    );
}

.divider-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 40px;
    background: linear-gradient(to top, rgba(28, 23, 20, 0.7), transparent);
    z-index: 5;
}

.caption-text {
    font-family: var(--font-marginalia);
    font-weight: 300;
    font-size: 0.75rem;
    color: rgba(246, 241, 234, 0.85);
    letter-spacing: 0.1em;
}

/* ============================================
   PAPER-LAYER DEPTH EFFECT
   ============================================ */
.chapter {
    background: var(--washi-white);
    box-shadow: var(--shadow-subtle);
    border: 1px solid #E8E0D4;
    position: relative;
}

.chapter::before {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 4px;
    right: -4px;
    height: 100%;
    background: var(--aged-linen);
    border: 1px solid #E8E0D4;
    z-index: -1;
    box-shadow: 0 2px 8px rgba(28, 23, 20, 0.04);
}

/* ============================================
   FOOTER
   ============================================ */
#site-footer {
    padding: 112px 40px 56px;
    text-align: center;
    background: var(--washi-white);
    border-top: 1px solid var(--paper-edge);
}

.footer-content {
    max-width: 600px;
    margin: 0 auto;
}

.footer-candle {
    margin-bottom: 28px;
    display: flex;
    justify-content: center;
}

.candle-flame {
    animation: flicker 3s ease-in-out infinite;
}

@keyframes flicker {
    0%, 100% { transform: scale(1) translateY(0); opacity: 0.9; }
    25% { transform: scale(1.02) translateY(-0.5px); opacity: 0.87; }
    50% { transform: scale(0.98) translateY(0.5px); opacity: 0.93; }
    75% { transform: scale(1.01) translateY(-0.3px); opacity: 0.88; }
}

.footer-text {
    font-family: var(--font-marginalia);
    font-weight: 300;
    font-size: 0.8rem;
    letter-spacing: 0.15em;
    color: var(--faded-graphite);
    margin-bottom: 8px;
}

.footer-date {
    font-family: var(--font-accent);
    font-weight: 300;
    font-style: italic;
    font-size: 1.2rem;
    color: var(--aged-terracotta);
    margin-bottom: 28px;
}

.footer-endmark {
    font-size: 1.5rem;
    color: var(--paper-edge);
}

/* ============================================
   SCROLL-TRIGGERED ANIMATIONS
   ============================================ */
.chapter-body {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.chapter-body.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Last paragraph fade-out on scroll */
.verso p.fading {
    opacity: 0.4;
    transition: opacity 0.6s ease;
}

/* ============================================
   RESPONSIVE: TABLET (768px - 1080px)
   ============================================ */
@media (max-width: 1080px) {
    .magazine-spread {
        grid-template-columns: 8fr 4fr;
        gap: 40px;
    }

    .pull-quote {
        margin-right: -15%;
    }

    .chapter {
        padding: 84px 32px 56px;
    }

    #chapter-nav {
        left: 12px;
    }

    .chapter-numeral {
        font-size: clamp(3rem, 8vw, 8rem);
    }
}

/* ============================================
   RESPONSIVE: MOBILE (< 768px)
   ============================================ */
@media (max-width: 768px) {
    .magazine-spread {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .chapter {
        padding: 56px 20px 40px;
        margin: 0 8px;
    }

    .chapter::before {
        display: none;
    }

    .recto {
        border-left: none;
        padding-left: 0;
        border-top: 1px solid var(--paper-edge);
        padding-top: 28px;
    }

    .marginalia-block {
        background: var(--aged-linen);
        padding: 16px;
        border-radius: 2px;
        margin-bottom: 12px;
    }

    .pull-quote {
        margin-right: 0;
    }

    .pull-quote p {
        font-size: clamp(1.1rem, 4vw, 1.4rem);
    }

    #chapter-nav {
        display: none;
    }

    #deckle-edge {
        display: none;
    }

    #running-header {
        right: 0;
        padding: 0 20px;
    }

    .chapter-numeral {
        font-size: clamp(2.5rem, 15vw, 5rem);
    }

    .hero-title {
        font-size: clamp(2.5rem, 10vw, 4rem);
    }

    .chapter-divider {
        height: 60vh;
        min-height: 300px;
    }

    .divider-caption {
        padding: 20px;
    }
}

/* ============================================
   PRINT-INSPIRED DETAILS
   ============================================ */

/* Justified text improvements */
.verso p {
    text-align: justify;
    word-spacing: -0.05em;
}

/* Selection color */
::selection {
    background: rgba(196, 169, 106, 0.3);
    color: var(--sumi-ink);
}

::-moz-selection {
    background: rgba(196, 169, 106, 0.3);
    color: var(--sumi-ink);
}

/* Smooth image transitions */
img {
    max-width: 100%;
    height: auto;
}

/* Warm color grade for images: highlights shift toward #F0E8DC */
.hero-image::after,
.divider-image::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(42, 36, 32, 0.08) 0%,
        transparent 40%,
        rgba(240, 232, 220, 0.1) 100%
    );
    pointer-events: none;
    z-index: 1;
}

/* Ensure grain overlay covers full area */
.chapter-divider .grain-overlay,
.chapter-divider .vignette {
    z-index: 2;
}