/* ═══════════════════════════════════════════
   調和論 ── キャイバーラ・ヘンケン著
   羊皮紙写本風スタイルシート
   ═══════════════════════════════════════════ */

/* --- CSS Custom Properties --- */
:root {
    /* 羊皮紙カラーパレット */
    --parchment-bg: #f5e6c8;
    --parchment-bg-dark: #e8d5a8;
    --parchment-edge: #d4b896;
    --ink-primary: #3a2a1a;
    --ink-secondary: #5a4632;
    --ink-light: #7a6652;
    --ink-faint: #9a8672;
    --accent-red: #8b3a2a;
    --accent-gold: #b8963a;
    --accent-gold-light: #d4b060;
    --border-ornate: #8a7656;
    --shadow-warm: rgba(58, 42, 26, 0.15);
    --shadow-deep: rgba(58, 42, 26, 0.25);

    /* Typography Scale */
    --font-body: 'Noto Serif JP', 'Yu Mincho', 'Hiragino Mincho ProN', serif;
    --font-heading-latin: 'Cinzel', serif;
    --font-decorative: 'Cinzel Decorative', serif;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 3rem;
    --space-xl: 4rem;
    --space-xxl: 6rem;
}

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

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

body {
    font-family: var(--font-body);
    color: var(--ink-primary);
    line-height: 1.95;
    background: #3a2a1a;
    min-height: 100vh;
    overflow-x: hidden;
}

/* --- 羊皮紙の端 (ダメージ表現) --- */
.parchment-edge {
    position: fixed;
    left: 0;
    right: 0;
    height: 30px;
    z-index: 100;
    pointer-events: none;
}

.parchment-edge--top {
    top: 0;
    background: linear-gradient(to bottom, 
        #3a2a1a 0%, 
        rgba(58, 42, 26, 0.6) 40%, 
        rgba(58, 42, 26, 0) 100%
    );
}

.parchment-edge--bottom {
    bottom: 0;
    background: linear-gradient(to top, 
        #3a2a1a 0%, 
        rgba(58, 42, 26, 0.6) 40%, 
        rgba(58, 42, 26, 0) 100%
    );
}

/* --- 写本本体 --- */
.manuscript {
    max-width: 780px;
    margin: 0 auto;
    padding: var(--space-xl) var(--space-lg);
    background: 
        /* 羊皮紙のテクスチャ（CSS模倣） */
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 28px,
            rgba(160, 130, 90, 0.04) 28px,
            rgba(160, 130, 90, 0.04) 29px
        ),
        radial-gradient(ellipse at 20% 50%, rgba(180, 150, 100, 0.1) 0%, transparent 70%),
        radial-gradient(ellipse at 80% 30%, rgba(160, 130, 90, 0.08) 0%, transparent 60%),
        radial-gradient(ellipse at 50% 80%, rgba(140, 110, 70, 0.06) 0%, transparent 50%),
        linear-gradient(to bottom, 
            var(--parchment-bg) 0%, 
            var(--parchment-bg-dark) 30%,
            var(--parchment-bg) 60%,
            var(--parchment-bg-dark) 100%
        );
    background-color: var(--parchment-bg);
    box-shadow: 
        inset 0 0 100px rgba(160, 130, 90, 0.3),
        0 0 60px rgba(0, 0, 0, 0.5),
        0 0 120px rgba(0, 0, 0, 0.3);
    position: relative;
}

/* 羊皮紙の縁の暗さ */
.manuscript::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    box-shadow: inset 0 0 80px rgba(100, 70, 40, 0.25);
    pointer-events: none;
    z-index: 1;
}

/* --- 巻頭 (Frontispiece) --- */
.frontispiece {
    text-align: center;
    padding: var(--space-xxl) var(--space-md);
    border-bottom: 2px solid var(--border-ornate);
    margin-bottom: var(--space-xl);
    position: relative;
}

.frontispiece__ornament {
    font-size: 2.5rem;
    color: var(--accent-gold);
    line-height: 1;
    margin: var(--space-sm) 0;
    opacity: 0.8;
}

.frontispiece__title {
    font-family: var(--font-body);
    font-size: 3.5rem;
    font-weight: 900;
    color: var(--ink-primary);
    letter-spacing: 0.5em;
    margin: var(--space-md) 0 var(--space-xs);
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
}

.frontispiece__subtitle {
    font-family: var(--font-heading-latin);
    font-size: 1.1rem;
    font-weight: 400;
    color: var(--ink-light);
    letter-spacing: 0.2em;
    font-style: italic;
    margin-bottom: var(--space-md);
}

.frontispiece__divider {
    font-size: 1.2rem;
    color: var(--accent-gold);
    letter-spacing: 0.5em;
    margin: var(--space-md) 0;
}

.frontispiece__author {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--ink-secondary);
    letter-spacing: 0.3em;
    margin-bottom: var(--space-xs);
}

.frontispiece__edition {
    font-size: 0.85rem;
    color: var(--ink-faint);
    letter-spacing: 0.15em;
}

/* --- 章 (Chapter) --- */
.chapter {
    padding: var(--space-lg) 0;
    border-bottom: 1px solid var(--border-ornate);
    margin-bottom: var(--space-lg);
    position: relative;
    z-index: 2;
}

.chapter:last-of-type {
    border-bottom: 2px solid var(--border-ornate);
}

.chapter__heading {
    font-family: var(--font-body);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--ink-primary);
    text-align: center;
    margin-bottom: var(--space-lg);
    letter-spacing: 0.2em;
    position: relative;
    padding-bottom: var(--space-sm);
}

.chapter__heading::after {
    content: '─────';
    display: block;
    color: var(--accent-gold);
    font-size: 0.8rem;
    letter-spacing: 0.5em;
    margin-top: var(--space-xs);
    opacity: 0.6;
}

.chapter__number {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--accent-red);
    letter-spacing: 0.4em;
    margin-bottom: var(--space-xs);
}

.chapter__subheading {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--ink-secondary);
    text-align: center;
    margin: var(--space-lg) 0 var(--space-md);
    letter-spacing: 0.15em;
}

/* --- 本文 --- */
.manuscript-text {
    font-size: 1.05rem;
    line-height: 2;
    text-align: justify;
    margin-bottom: var(--space-md);
    text-indent: 1em;
    color: var(--ink-primary);
    position: relative;
    z-index: 2;
}

.manuscript-text:last-child {
    margin-bottom: 0;
}

.manuscript-text--centered {
    text-align: center;
    text-indent: 0;
    font-style: italic;
    color: var(--ink-secondary);
}

/* --- 挿絵フレーム --- */
.illuminated-frame {
    margin: var(--space-lg) auto;
    max-width: 600px;
    text-align: center;
    position: relative;
    z-index: 2;
}

.manuscript-illustration {
    width: 100%;
    max-width: 550px;
    height: auto;
    border: 3px solid var(--border-ornate);
    padding: 8px;
    background: rgba(245, 230, 200, 0.5);
    box-shadow: 
        0 4px 20px var(--shadow-warm),
        inset 0 0 20px rgba(160, 130, 90, 0.15);
    transition: box-shadow 0.4s ease;
}

.manuscript-illustration:hover {
    box-shadow: 
        0 8px 30px var(--shadow-deep),
        inset 0 0 20px rgba(160, 130, 90, 0.2);
}

.illustration-caption {
    font-size: 0.82rem;
    color: var(--ink-light);
    margin-top: var(--space-sm);
    letter-spacing: 0.1em;
    font-style: italic;
    line-height: 1.6;
}

/* --- 銘句 (Epigraph) --- */
.epigraph {
    margin: var(--space-lg) var(--space-md);
    padding: var(--space-md) var(--space-lg);
    border-left: 3px solid var(--accent-gold);
    background: rgba(184, 150, 58, 0.06);
    position: relative;
    z-index: 2;
}

.epigraph__text {
    font-size: 1.1rem;
    font-weight: 500;
    line-height: 2.1;
    color: var(--ink-secondary);
    font-style: italic;
}

.epigraph__attribution {
    font-size: 0.85rem;
    color: var(--ink-faint);
    text-align: right;
    margin-top: var(--space-sm);
    letter-spacing: 0.1em;
}

/* --- 訓条リスト --- */
.precepts-list {
    margin: var(--space-md) 0;
    position: relative;
    z-index: 2;
}

.precept {
    display: flex;
    gap: var(--space-sm);
    padding: var(--space-sm) 0;
    border-bottom: 1px dotted rgba(138, 118, 86, 0.3);
    align-items: baseline;
}

.precept:last-child {
    border-bottom: none;
}

.precept__number {
    font-weight: 700;
    color: var(--accent-red);
    white-space: nowrap;
    min-width: 3em;
    font-size: 0.95rem;
}

.precept__text {
    font-size: 0.98rem;
    line-height: 1.9;
    color: var(--ink-secondary);
}

/* --- 傍注 (Sidebar Note) --- */
.sidebar-note {
    margin: var(--space-lg) var(--space-md);
    padding: var(--space-sm) var(--space-md);
    border: 1px solid rgba(138, 118, 86, 0.4);
    background: rgba(212, 184, 150, 0.15);
    font-size: 0.88rem;
    position: relative;
    z-index: 2;
}

.sidebar-note__title {
    font-weight: 700;
    color: var(--accent-red);
    margin-bottom: var(--space-xs);
    letter-spacing: 0.1em;
    font-size: 0.85rem;
}

.sidebar-note__text {
    color: var(--ink-light);
    line-height: 1.85;
}

/* --- 墓碑銘 --- */
.epitaph {
    text-align: center;
    margin: var(--space-xl) 0;
    padding: var(--space-lg);
    position: relative;
    z-index: 2;
}

.epitaph::before,
.epitaph::after {
    content: '── ◆ ──';
    display: block;
    color: var(--accent-gold);
    font-size: 0.9rem;
    letter-spacing: 0.5em;
    opacity: 0.6;
}

.epitaph::before {
    margin-bottom: var(--space-md);
}

.epitaph::after {
    margin-top: var(--space-md);
}

.epitaph__text {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--ink-primary);
    letter-spacing: 0.15em;
    line-height: 2.2;
}

/* --- 奥付 (Colophon) --- */
.colophon {
    text-align: center;
    padding: var(--space-lg) 0;
    margin-top: var(--space-lg);
    position: relative;
    z-index: 2;
}

.colophon__ornament {
    font-size: 1.2rem;
    color: var(--accent-gold);
    letter-spacing: 0.5em;
    margin: var(--space-md) 0;
    opacity: 0.7;
}

.colophon__text {
    font-size: 0.82rem;
    color: var(--ink-faint);
    line-height: 2;
    letter-spacing: 0.08em;
}

/* --- 但し書き (Disclaimer) --- */
.disclaimer {
    margin-top: var(--space-xl);
    padding: var(--space-lg) var(--space-md);
    border-top: 2px solid var(--border-ornate);
    text-align: center;
    position: relative;
    z-index: 2;
}

.disclaimer__text {
    font-size: 0.82rem;
    color: var(--ink-light);
    line-height: 2;
    letter-spacing: 0.05em;
}

.disclaimer__attribution {
    font-size: 0.78rem;
    color: var(--ink-faint);
    margin-top: var(--space-md);
    letter-spacing: 0.1em;
    font-style: italic;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .manuscript {
        padding: var(--space-lg) var(--space-md);
    }

    .frontispiece__title {
        font-size: 2.5rem;
        letter-spacing: 0.3em;
    }

    .frontispiece__subtitle {
        font-size: 0.9rem;
    }

    .frontispiece {
        padding: var(--space-xl) var(--space-sm);
    }

    .chapter__heading {
        font-size: 1.3rem;
    }

    .manuscript-text {
        font-size: 0.98rem;
    }

    .epigraph {
        margin: var(--space-md) var(--space-xs);
        padding: var(--space-sm) var(--space-md);
    }

    .epigraph__text {
        font-size: 1rem;
    }

    .precept {
        flex-direction: column;
        gap: 0.25rem;
    }

    .precept__number {
        min-width: auto;
    }

    .epitaph__text {
        font-size: 1.2rem;
        letter-spacing: 0.2em;
    }

    .sidebar-note {
        margin: var(--space-md) 0;
    }
}

@media (max-width: 480px) {
    .manuscript {
        padding: var(--space-md) var(--space-sm);
    }

    .frontispiece__title {
        font-size: 2rem;
        letter-spacing: 0.2em;
    }

    .chapter__heading {
        font-size: 1.15rem;
    }

    .manuscript-text {
        font-size: 0.92rem;
    }
}

/* --- Animation: フェードイン --- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.chapter {
    animation: fadeInUp 0.8s ease-out both;
}

.chapter:nth-child(2) { animation-delay: 0.1s; }
.chapter:nth-child(3) { animation-delay: 0.2s; }
.chapter:nth-child(4) { animation-delay: 0.3s; }
.chapter:nth-child(5) { animation-delay: 0.4s; }
.chapter:nth-child(6) { animation-delay: 0.5s; }

/* --- ルビのスタイル調整 --- */
ruby {
    ruby-align: center;
}

rt {
    font-size: 0.6em;
    color: var(--ink-light);
}

/* --- 選択テキストの色 --- */
::selection {
    background: rgba(184, 150, 58, 0.3);
    color: var(--ink-primary);
}

/* --- スクロールバーのスタイル --- */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: #3a2a1a;
}

::-webkit-scrollbar-thumb {
    background: var(--border-ornate);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-gold);
}