/**
 * RSite — Chapter Page  v2.0
 * Depends on: base.css (variables, glass-card)
 *
 * Premium dark reading experience for chapter content.
 * Theme-aware: all accent colors go through --chapter-accent layer.
 */

/*
   CHAPTER HEADER
*/

.chapter-header {
    padding: 0;
    margin-bottom: var(--space-lg);
    text-align: left;
}

.chapter-meta {
    font-size: 0.8em;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    letter-spacing: 0.03em;
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border-faint);
}

.chapter-meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.chapter-title {
    font-size: 2.2em;
    margin: 0;
    -webkit-text-fill-color: unset;
    background: none;
    color: var(--gold-accent);
    animation: none;
    letter-spacing: 0.01em;
}

/*
   CHAPTER CONTENT — Theme Layer (Phase 2)
   All accent colors inside .chapter-content go through these vars.
   Switching theme = swapping one class on .chapter-content.
*/

.chapter-content {
    /* ── Themeable accent layer ── */
    --chapter-accent:      var(--gold-accent);
    --chapter-accent-dim:  var(--accent-dim);
    --chapter-accent-line: var(--accent-line);
    --chapter-accent-soft: var(--accent-soft);
    --chapter-code-bg:     var(--surface-overlay-mid);
    --chapter-code-border: var(--border-light);
    --chapter-heading-color: var(--chapter-accent);
    --chapter-dialogue:    var(--accent-dialogue);

    /* ── Typography (reader prefs) ── */
    font-family: var(--reader-font-family, var(--font-body));
    line-height: var(--reader-line-height, 1.85);
    font-size: var(--reader-font-size, 1.05em);
    color: var(--text-primary);
    letter-spacing: var(--reader-letter-spacing, 0.01em);
    word-spacing: var(--reader-word-spacing, 0em);
    overflow-wrap: break-word;

    /* ── Transitions ── */
    transition: font-size 0.5s ease, letter-spacing 0.5s ease,
        word-spacing 0.5s ease, line-height 0.5s ease,
        color 0.3s ease, border-color 0.3s ease, background-color 0.3s ease;
}

/* Hyphenation — prose paragraphs only */
.chapter-content p {
    hyphens: auto;
    -webkit-hyphens: auto;
}

.chapter-content h1,
.chapter-content h2,
.chapter-content h3,
.chapter-content table,
.chapter-content th,
.chapter-content td,
.chapter-content strong {
    hyphens: none;
    -webkit-hyphens: none;
    word-break: normal;
}

/*
   PRESET THEMES (Phase 2)
   Switched by adding class on .chapter-content:
     element.className = 'chapter-content theme-gold'
*/

/* Default — gold (identical to :root accent vars, no override needed) */

/* Gold — explicit (needed when page accent ≠ chapter accent) */
.chapter-content.theme-gold {
    --chapter-accent-dim: rgba(212, 175, 55, 0.15);
    --chapter-accent-line: rgba(212, 175, 55, 0.25);
    --chapter-accent-soft: rgba(212, 175, 55, 0.7);
    --chapter-dialogue: #c9b88a;
}

/* Cool — steel blue */
.chapter-content.theme-steel {
    --chapter-accent: #7BA7BC;
    --chapter-accent-dim: rgba(123, 167, 188, 0.15);
    --chapter-accent-line: rgba(123, 167, 188, 0.25);
    --chapter-accent-soft: rgba(123, 167, 188, 0.7);
    --chapter-dialogue: #a0bfcf;
}

/* Warm — aged paper */
.chapter-content.theme-latte {
    --chapter-accent: #E8955A;
    --chapter-accent-dim: rgba(232, 149, 90, 0.15);
    --chapter-accent-line: rgba(232, 149, 90, 0.25);
    --chapter-accent-soft: rgba(232, 149, 90, 0.7);
    --chapter-dialogue: #d4a878;
}

/* Suppress transition flash during page load */
.no-pref-transition .chapter-content {
    transition: none !important;
}

/* Soft crossfade on font-family change (not natively animatable) */
.chapter-content.is-font-swapping {
    opacity: 0.55;
    transition: font-size 0.5s ease, letter-spacing 0.5s ease,
        word-spacing 0.5s ease, line-height 0.5s ease,
        opacity 0.25s ease;
}

/*
   SECTION HEADINGS — accent + gold divider (Phase 2 + Phase 3)
   All colors via --chapter-accent / --chapter-heading-color.
*/

.chapter-content h1,
.chapter-content h2,
.chapter-content h3 {
    font-family: var(--font-heading);
    color: var(--chapter-heading-color);
    font-size: 1.5em;
    margin: 2rem 0 1rem 0;
    padding-bottom: var(--space-sm);
    padding-left: 14px;
    border-bottom: none;
    border-left: 3px solid transparent;
    position: relative;
    animation: headingFadeIn 0.6s var(--ease-out) both;
}

.chapter-content h1 {
    font-size: 1.85em;
    border-left-width: 3px;
    padding-left: 14px;
}

/* Phase 3: h2 — slightly thinner border */
.chapter-content h2 {
    font-size: 1.65em;
    border-left-width: 2px;
    padding-left: 12px;
}

/* Phase 3: h3 — thinnest, slightly subdued */
.chapter-content h3 {
    font-size: 1.45em;
    border-left-width: 1px;
    padding-left: 10px;
    opacity: 0.85;
}

/* Phase 3: heading after heading — collapse top margin */
.chapter-content :is(h1, h2, h3) + :is(h2, h3) {
    margin-top: 0.4rem;
}

/* Gold left border — animated line via ::before */
.chapter-content h1::before,
.chapter-content h2::before,
.chapter-content h3::before {
    content: '';
    position: absolute;
    left: 0;
    top: 4px;
    bottom: 4px;
    width: 3px;
    background: linear-gradient(180deg,
            var(--chapter-accent) 0%,
            var(--chapter-accent-dim) 100%);
    opacity: 0;
    border-radius: 2px;
    animation: headingLineIn 0.8s var(--ease-out) 0.2s both;
}

/* h2 — thinner line */
.chapter-content h2::before {
    width: 2px;
}

/* h3 — thinnest line */
.chapter-content h3::before {
    width: 1px;
}

@keyframes headingFadeIn {
    from {
        opacity: 0;
        transform: translateX(-6px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes headingLineIn {
    from {
        opacity: 0;
        transform: scaleY(0);
    }

    to {
        opacity: 1;
        transform: scaleY(1);
    }
}

/* First header = chapter title — make it extra big regardless of tag */
.chapter-content>h1:first-child,
.chapter-content>h2:first-child,
.chapter-content>h3:first-child {
    font-size: 2.2em;
    border-bottom: none;
    margin-bottom: var(--space-md);
    margin-top: 0;
    letter-spacing: 0.01em;
}

/* Subtitle — a header following the title */
.chapter-content> :is(h1, h2, h3):first-child+ :is(h1, h2, h3) {
    font-size: 1.15em;
    color: var(--text-secondary);
    border-bottom: none;
    margin-top: 0;
    padding-bottom: var(--space-md);
}

/* Phase 1 bug: explicit .is-subtitle class (future transformer support) */
.chapter-content h2.is-subtitle,
.chapter-content h3.is-subtitle {
    font-size: 1.15em;
    color: var(--text-secondary);
    border-bottom: none;
    margin-top: 0;
}

/*
   PARAGRAPHS, INLINE
*/

.chapter-content p {
    margin: var(--reader-paragraph-spacing, 1.5rem) 0;
    text-align: var(--reader-text-align, justify);
    color: var(--text-primary);
}

.chapter-content strong {
    color: var(--chapter-accent);
}

.chapter-content em {
    color: inherit;
    font-style: italic;
}

.chapter-content a {
    color: var(--chapter-accent);
    text-decoration: none;
    border-bottom: 1px solid var(--chapter-accent-line);
    transition: all var(--duration-fast) ease;
}

.chapter-content a:hover {
    color: var(--gold-light);
    border-bottom-color: var(--gold-light);
}

/*
   LISTS — accent circles with subtle periodic glow
*/

.chapter-content ul {
    list-style-type: disc;
    padding-left: 1.6em;
    margin: 1rem 0;
}

.chapter-content ol {
    padding-left: 1.8em;
    margin: 1rem 0;
}

.chapter-content li {
    margin: 0.4em 0;
    padding-left: 0.3em;
    color: var(--chapter-accent-soft);
    transition: text-shadow 1s ease;
}

.chapter-content li > * {
    color: var(--chapter-accent-soft);
}

.chapter-content li::marker {
    color: var(--chapter-accent);
    font-size: 0.7em;
}

/* Subtle periodic shimmer on list items — staggered */
.chapter-content li:nth-child(5n+1) { animation: listItemGlow 12s ease-in-out 0s infinite; }
.chapter-content li:nth-child(5n+2) { animation: listItemGlow 12s ease-in-out 2.4s infinite; }
.chapter-content li:nth-child(5n+3) { animation: listItemGlow 12s ease-in-out 4.8s infinite; }
.chapter-content li:nth-child(5n+4) { animation: listItemGlow 12s ease-in-out 7.2s infinite; }
.chapter-content li:nth-child(5n+5) { animation: listItemGlow 12s ease-in-out 9.6s infinite; }

@keyframes listItemGlow {
    0%, 100% { text-shadow: none; }
    8% { text-shadow: 0 0 6px var(--chapter-accent-dim); }
    16% { text-shadow: none; }
}

/* Nested lists */
.chapter-content ul ul,
.chapter-content ol ul {
    margin: 0.3em 0;
    list-style-type: circle;
}

.chapter-content ul ol,
.chapter-content ol ol {
    margin: 0.3em 0;
}

/*
   CODE
*/

.chapter-content code {
    background: var(--chapter-code-bg);
    border: 1px solid var(--chapter-code-border);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: 0.9em;
}

.chapter-content pre {
    background: var(--chapter-code-bg);
    border: 1px solid var(--chapter-code-border);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: var(--space-lg) 0;
}

.chapter-content pre code {
    background: none;
    border: none;
    padding: 0;
}

/*
   BLOCKQUOTES / CALLOUTS — accent via theme
*/

.chapter-content blockquote {
    border-left: 3px solid var(--chapter-accent);
    padding: var(--space-md) var(--space-lg);
    margin: var(--space-lg) 0;
    background: var(--chapter-accent-dim);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    box-shadow: inset 2px 0 8px var(--surface-overlay-light);
}

.chapter-content blockquote p {
    color: var(--text-secondary);
    margin: 0;
}

/*
   ACCENT ELEMENTS — Phase 3 (CSS prep for transformer)
   Transformer will emit these classes; CSS is ready now.
*/

/* Inline accent — ==text== in MD or .accent class */
.chapter-content .accent {
    color: var(--chapter-accent);
    font-style: normal;
}

/* Subdued secondary text */
.chapter-content .muted {
    color: var(--text-secondary);
    font-size: 0.95em;
}

/* Highlight-marker (<mark> or ==...== via transformer) */
.chapter-content mark {
    background: var(--chapter-accent-dim);
    color: inherit;
    padding: 0 3px;
    border-radius: 2px;
}

/*
   DIALOGUE — speech colored distinctly from narration
   Pipeline wraps "quoted text" in <span class="dialogue">
*/

.chapter-content .dialogue {
    color: var(--chapter-dialogue);
}

/*
   HORIZONTAL RULES
*/

.chapter-content hr {
    border: none;
    border-top: 1px solid var(--chapter-accent-dim);
    margin: 2rem 0;
}

/*
   IMAGES
*/

.chapter-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: var(--space-lg) 0;
}

/*
   TABLES
*/

.chapter-content table {
    width: 100%;
    table-layout: auto;
    margin: var(--space-lg) 0;
    font-size: clamp(0.72em, 1.8vw, 0.95em);
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.chapter-content th {
    color: var(--chapter-accent);
    font-weight: 600;
    text-align: left;
    padding: var(--space-sm) var(--space-md);
    border-bottom: 2px solid var(--chapter-accent-line);
}

.chapter-content td {
    padding: var(--space-sm) var(--space-md);
    border-bottom: 1px solid var(--border-faint);
}

.chapter-content tr:hover td {
    background: var(--bg-hover-faint);
}

/*
   CHAPTER FOOTER
*/

.chapter-footer {
    padding-top: var(--space-lg);
    border-top: 1px solid var(--chapter-accent-dim);
    margin-top: var(--space-2xl);
}

/*
   TABLE OF CONTENTS
*/

.toc-aside {
    margin-bottom: var(--space-lg);
    padding: var(--space-lg);
}

.toc-aside h3 {
    margin: 0 0 var(--space-md) 0;
}

.toc-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--duration-fast) ease;
    font-size: 0.95em;
}

.toc-link:hover {
    color: var(--chapter-accent);
}

.toc-item {
    padding: 5px 0;
}

/*
   RESPONSIVE
*/

@media (max-width: 768px) {
    .glass-card {
        margin-left: -1px;
        margin-right: -1px;
    }

    .glass-card.p-50 {
        padding: 16px;
    }

    .chapter-content {
        font-size: var(--reader-font-size, 15px);
    }

    .chapter-content h1 {
        font-size: 1.5em;
    }

    .chapter-content h2 {
        font-size: 1.35em;
    }

    .chapter-content h3 {
        font-size: 1.2em;
    }

    .chapter-title {
        font-size: 1.6em;
    }

    .chapter-header .flex-between {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-md);
    }
}
