/* ==========================================================================
   COMPUTING MACHINERY AND INTELLIGENCE — Alan M. Turing (1950)
   Distraction-Free Reader Stylesheet
   ========================================================================== */

@import url('fonts.css');

:root {
    --font-scale: 1.05rem;
    --font-serif: 'Newsreader', Georgia, 'Times New Roman', serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', Consolas, Monaco, monospace;
    --font-display: 'Cinzel', 'Newsreader', Georgia, serif;

    --sidebar-width: 290px;
    --content-max-width: 68ch;
    --header-height: 56px;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
}

/* --------------------------------------------------------------------------
   Themes
   -------------------------------------------------------------------------- */

/* Light Theme (Clean Academic Paper) */
html[data-theme="light"] {
    --bg-base: #fcfbf9;
    --bg-surface: #ffffff;
    --bg-surface-elevated: #f7f5f0;
    --bg-sidebar: #f7f5f0;
    --border-subtle: #e6e2d8;
    --border-strong: #d2ccbf;
    --text-main: #1f1e1d;
    --text-secondary: #5a554e;
    --text-muted: #878074;
    --text-light: #aba396;
    --accent: #9a3412;
    --accent-hover: #7c2d12;
    --accent-subtle: #ffedd5;
    --dialogue-bg: #f9f7f2;
    --dialogue-border: #e8e2d5;
    --speaker-interrogator: #0369a1;
    --speaker-candidate: #047857;
    --code-bg: #f3f0e8;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.1);
}

/* Parchment Theme (Warm Library Sepia) */
html[data-theme="parchment"] {
    --bg-base: #f5eedb;
    --bg-surface: #faefe0;
    --bg-surface-elevated: #ede2cd;
    --bg-sidebar: #ede2cd;
    --border-subtle: #ded1b8;
    --border-strong: #caba9e;
    --text-main: #2d2417;
    --text-secondary: #5e523f;
    --text-muted: #877864;
    --text-light: #ad9e88;
    --accent: #872800;
    --accent-hover: #6b2000;
    --accent-subtle: #ebd7be;
    --dialogue-bg: #ece0ca;
    --dialogue-border: #dbcbb0;
    --speaker-interrogator: #0f6277;
    --speaker-candidate: #246a48;
    --code-bg: #e6dac1;
    --shadow-sm: 0 1px 3px rgba(45, 36, 23, 0.06);
    --shadow-md: 0 4px 14px rgba(45, 36, 23, 0.09);
    --shadow-lg: 0 10px 30px rgba(45, 36, 23, 0.12);
}

/* Dark Theme (Obsidian Night Reader) */
html[data-theme="dark"] {
    --bg-base: #121214;
    --bg-surface: #1a1a1e;
    --bg-surface-elevated: #222228;
    --bg-sidebar: #17171a;
    --border-subtle: #2d2d34;
    --border-strong: #40404a;
    --text-main: #e6e6ea;
    --text-secondary: #a2a2ad;
    --text-muted: #74747f;
    --text-light: #52525c;
    --accent: #f97316;
    --accent-hover: #fb923c;
    --accent-subtle: #431f0a;
    --dialogue-bg: #18181d;
    --dialogue-border: #2c2c36;
    --speaker-interrogator: #38bdf8;
    --speaker-candidate: #34d399;
    --code-bg: #1e1e24;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.6);
}

/* --------------------------------------------------------------------------
   Reset & Base Styles
   -------------------------------------------------------------------------- */

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    background-color: var(--bg-base);
    color: var(--text-main);
    font-family: var(--font-serif);
    font-size: var(--font-scale);
    line-height: 1.76;
    text-rendering: optimizeLegibility;
    font-feature-settings: "kern" 1, "liga" 1, "onum" 1;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Selection */
::selection {
    background-color: var(--accent-subtle);
    color: var(--text-main);
}

/* --------------------------------------------------------------------------
   Top Progress Bar
   -------------------------------------------------------------------------- */

#progress-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: transparent;
    z-index: 1000;
}

#progress-bar {
    height: 100%;
    width: 0%;
    background: var(--accent);
    transition: width 0.08s ease-out;
}

/* --------------------------------------------------------------------------
   Top Navigation Deck
   -------------------------------------------------------------------------- */

#top-bar {
    position: sticky;
    top: 0;
    z-index: 900;
    height: var(--header-height);
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.topbar-inner {
    max-width: 1540px;
    height: 100%;
    margin: 0 auto;
    padding: 0 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 1rem;
    min-width: 0;
}

.topbar-branding {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.topbar-paper-title {
    font-family: var(--font-display);
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.topbar-author {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.02em;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-shrink: 0;
}

.read-stats {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-family: var(--font-sans);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.divider {
    width: 1px;
    height: 20px;
    background-color: var(--border-subtle);
    margin: 0 0.2rem;
}

/* Control Buttons */
.icon-btn, .control-btn, .theme-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.icon-btn {
    padding: 0.4rem 0.65rem;
    gap: 0.4rem;
    font-size: 0.85rem;
    font-weight: 500;
}

.icon-btn:hover, .control-btn:hover, .theme-btn:hover {
    background-color: var(--bg-surface-elevated);
    border-color: var(--border-strong);
    color: var(--text-main);
}

.control-btn {
    width: 28px;
    height: 28px;
    font-size: 0.85rem;
    font-weight: 600;
}

.font-controls {
    display: flex;
    gap: 0.25rem;
}

.theme-controls {
    display: flex;
    background: var(--bg-base);
    padding: 2px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-subtle);
}

.theme-btn {
    border: none;
    padding: 0.25rem 0.55rem;
    font-size: 0.78rem;
    font-weight: 500;
    border-radius: 3px;
    color: var(--text-muted);
}

.theme-btn.active {
    background: var(--bg-surface);
    color: var(--accent);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.cite-btn {
    color: var(--accent);
    border-color: var(--accent-subtle);
    background: var(--accent-subtle);
}

.cite-btn:hover {
    background: var(--accent);
    color: #ffffff;
    border-color: var(--accent);
}

/* --------------------------------------------------------------------------
   App Layout
   -------------------------------------------------------------------------- */

.app-layout {
    display: flex;
    max-width: 1540px;
    margin: 0 auto;
    position: relative;
}

/* --------------------------------------------------------------------------
   Sidebar Table of Contents
   -------------------------------------------------------------------------- */

.sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-subtle);
    transition: transform var(--transition-normal);
}

.sidebar-sticky {
    position: sticky;
    top: var(--header-height);
    height: calc(100vh - var(--header-height));
    overflow-y: auto;
    padding: 1.5rem 1.2rem;
    scrollbar-width: thin;
    scrollbar-color: var(--border-subtle) transparent;
}

.sidebar-sticky::-webkit-scrollbar {
    width: 5px;
}

.sidebar-sticky::-webkit-scrollbar-thumb {
    background: var(--border-subtle);
    border-radius: 3px;
}

.toc-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-subtle);
}

.toc-title {
    font-family: var(--font-display);
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.close-btn {
    display: none;
    border: none;
    padding: 0.2rem 0.4rem;
}

.toc-list, .toc-sublist {
    list-style: none;
}

.toc-item {
    margin-bottom: 0.35rem;
}

.toc-link {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
    padding: 0.38rem 0.55rem;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    text-decoration: none;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    line-height: 1.4;
    transition: all var(--transition-fast);
}

.toc-bullet {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1.4rem;
    height: 1.4rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 3px;
    background: var(--bg-surface-elevated);
    color: var(--text-muted);
    border: 1px solid var(--border-subtle);
    flex-shrink: 0;
}

.toc-link:hover {
    color: var(--text-main);
    background-color: var(--bg-surface);
}

.toc-item.active > .toc-link {
    background-color: var(--bg-surface);
    color: var(--accent);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.toc-item.active > .toc-link .toc-bullet {
    background-color: var(--accent);
    color: #ffffff;
    border-color: var(--accent);
}

/* Sub-items (The 9 Objections) */
.toc-sublist {
    margin-left: 1.4rem;
    padding-left: 0.65rem;
    border-left: 1.5px solid var(--border-subtle);
    margin-top: 0.25rem;
    margin-bottom: 0.4rem;
    display: none; /* hidden until section 6 active */
}

.toc-item.active .toc-sublist,
.toc-item.expanded .toc-sublist {
    display: block;
}

.toc-subitem {
    margin-bottom: 0.2rem;
}

.toc-sublink {
    display: block;
    padding: 0.22rem 0.45rem;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    text-decoration: none;
    font-family: var(--font-sans);
    font-size: 0.78rem;
    line-height: 1.35;
    transition: all var(--transition-fast);
}

.toc-sublink .toc-num {
    font-weight: 600;
    margin-right: 0.2rem;
}

.toc-sublink:hover {
    color: var(--text-main);
}

.toc-subitem.active .toc-sublink {
    color: var(--accent);
    font-weight: 600;
    background-color: var(--accent-subtle);
}

.sidebar-backdrop {
    display: none;
}

/* --------------------------------------------------------------------------
   Main Reader Container
   -------------------------------------------------------------------------- */

.reader-main {
    flex: 1;
    min-width: 0;
    padding: 3.5rem 2rem 6rem;
    position: relative;
}

.paper-article {
    max-width: var(--content-max-width);
    margin: 0 auto;
    position: relative;
}

/* --------------------------------------------------------------------------
   Paper Header
   -------------------------------------------------------------------------- */

.paper-header {
    margin-bottom: 4rem;
    padding-bottom: 2.5rem;
    border-bottom: 2px solid var(--border-subtle);
    text-align: center;
}

.journal-stamp {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.2rem;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-subtle);
}

.journal-name {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--text-main);
}

.journal-volume {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 1.05rem;
    color: var(--text-secondary);
}

.journal-issue {
    font-family: var(--font-sans);
    font-size: 0.8rem;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-top: 0.2rem;
}

.paper-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: 0.03em;
    color: var(--text-main);
    margin-bottom: 1.5rem;
}

.author-block {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.15rem;
    margin-bottom: 2.25rem;
}

.author-by {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 1rem;
    color: var(--text-muted);
}

.author-name {
    font-family: var(--font-display);
    font-size: 1.45rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent);
}

.author-affiliation {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.header-abstract-banner {
    margin: 2rem 0;
    padding: 1.5rem 1.75rem;
    background-color: var(--bg-surface-elevated);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--accent);
    text-align: left;
}

.abstract-quote {
    font-style: italic;
    font-size: 1.05rem;
    line-height: 1.68;
    color: var(--text-secondary);
    margin: 0;
}

.quick-jump-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1.5rem;
}

.jump-label {
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.jump-chip {
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 500;
    padding: 0.3rem 0.65rem;
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.jump-chip:hover {
    background: var(--accent-subtle);
    border-color: var(--accent);
    color: var(--accent);
}

/* --------------------------------------------------------------------------
   Paper Sections & Typography
   -------------------------------------------------------------------------- */

.paper-section {
    margin-bottom: 4.5rem;
    position: relative;
}

.section-header {
    margin-bottom: 1.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-subtle);
}

.section-title {
    font-family: var(--font-display);
    font-size: 1.65rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    color: var(--text-main);
    line-height: 1.35;
}

.section-content p {
    margin-bottom: 1.4rem;
    text-align: justify;
    hyphens: auto;
}

/* Drop-Cap for Section 1 opening */
#sec-1 .section-content > p:first-of-type::first-letter {
    font-family: var(--font-display);
    font-size: 3.5rem;
    line-height: 0.85;
    float: left;
    margin-top: 0.15rem;
    margin-right: 0.6rem;
    padding-bottom: 0.1rem;
    color: var(--accent);
    font-weight: 700;
}

.section-content em {
    font-style: italic;
}

.section-content var {
    font-family: var(--font-serif);
    font-style: italic;
    font-weight: 600;
    padding: 0 0.1em;
}

.section-content sub, .section-content sup {
    font-size: 0.75em;
    line-height: 0;
    position: relative;
    vertical-align: baseline;
}

.section-content sub {
    bottom: -0.25em;
}

.section-content sup {
    top: -0.5em;
}

.section-content ol, .section-content ul {
    margin: 1.25rem 0 1.5rem 2rem;
}

.section-content li {
    margin-bottom: 0.5rem;
}

.section-content blockquote {
    margin: 1.75rem 0;
    padding: 1rem 1.5rem;
    border-left: 3px solid var(--border-strong);
    background-color: var(--bg-surface-elevated);
    font-style: italic;
    color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   Original Mind Margin Page Markers
   -------------------------------------------------------------------------- */

.page-marker {
    display: block;
    position: relative;
    height: 0;
    overflow: visible;
}

.page-marker-badge {
    position: absolute;
    right: -84px;
    top: -0.2rem;
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-muted);
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: 3px;
    padding: 0.1rem 0.35rem;
    letter-spacing: 0.02em;
    user-select: none;
    transition: all var(--transition-fast);
}

.page-marker-badge:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-subtle);
}

/* --------------------------------------------------------------------------
   Dialogue / Imitation Game Cards
   -------------------------------------------------------------------------- */

.dialogue-card {
    margin: 2rem 0;
    background: var(--dialogue-bg);
    border: 1px solid var(--dialogue-border);
    border-left: 4px solid var(--accent);
    border-radius: var(--radius-md);
    padding: 1.25rem 1.5rem;
    box-shadow: var(--shadow-sm);
}

.dialogue-turn {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.85rem;
    align-items: baseline;
}

.dialogue-turn:last-child {
    margin-bottom: 0;
}

.speaker-label {
    flex-shrink: 0;
    min-width: 105px;
    font-family: var(--font-sans);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    padding: 0.2rem 0.5rem;
    border-radius: var(--radius-sm);
    text-align: center;
    border: 1px solid transparent;
}

.speaker-interrogator .speaker-label {
    background-color: rgba(3, 105, 161, 0.12);
    color: var(--speaker-interrogator);
    border-color: rgba(3, 105, 161, 0.25);
}

.speaker-candidate .speaker-label {
    background-color: rgba(4, 120, 87, 0.12);
    color: var(--speaker-candidate);
    border-color: rgba(4, 120, 87, 0.25);
}

.speech-bubble, .speech-content {
    flex: 1;
    font-size: 0.98rem;
    line-height: 1.6;
    color: var(--text-main);
}

.speech-bubble p {
    margin-bottom: 0.4rem;
    text-align: left;
}

.speech-bubble p:last-child {
    margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   Section 6: The 9 Objections
   -------------------------------------------------------------------------- */

.objection-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 2.75rem 0 1.25rem;
    padding-bottom: 0.5rem;
    border-bottom: 1.5px dashed var(--border-strong);
    scroll-margin-top: calc(var(--header-height) + 1.5rem);
}

.objection-badge {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 700;
    background-color: var(--accent);
    color: #ffffff;
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-sm);
    letter-spacing: 0.04em;
    flex-shrink: 0;
}

.objection-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--text-main);
    line-height: 1.35;
}

/* --------------------------------------------------------------------------
   Tables (Section 5)
   -------------------------------------------------------------------------- */

.table-container {
    margin: 2rem 0;
    overflow-x: auto;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 0.5rem;
}

.turing-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    text-align: center;
}

.turing-table th, .turing-table td {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-subtle);
}

.turing-table th {
    background-color: var(--bg-surface-elevated);
    font-weight: 600;
    color: var(--text-secondary);
}

.turing-table td var, .turing-table th var {
    font-family: var(--font-mono);
    font-weight: 600;
}

.turing-table tr:hover td {
    background-color: var(--accent-subtle);
}

/* --------------------------------------------------------------------------
   Footnotes
   -------------------------------------------------------------------------- */

.fn-ref {
    font-size: 0.78em;
    line-height: 0;
    vertical-align: super;
    margin-left: 0.15em;
}

.fn-link {
    color: var(--accent);
    text-decoration: none;
    font-family: var(--font-sans);
    font-weight: 600;
    padding: 0 0.15em;
    border-radius: 2px;
    transition: background-color var(--transition-fast);
}

.fn-link:hover {
    background-color: var(--accent-subtle);
}

.footnotes-section {
    border-top: 2px solid var(--border-strong);
    padding-top: 2.5rem;
    margin-top: 4rem;
}

.footnotes-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.footnote-item {
    display: flex;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background-color: var(--bg-surface-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    font-size: 0.92rem;
    line-height: 1.6;
}

.fn-number {
    font-family: var(--font-mono);
    font-weight: 700;
    color: var(--accent);
    flex-shrink: 0;
}

.fn-content p {
    margin: 0;
    text-align: left;
}

.fn-backlink {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    margin-left: 0.35rem;
}

.fn-backlink:hover {
    text-decoration: underline;
}

/* Footnote Popover (Hover/Click Tooltip) */
.fn-popover {
    position: absolute;
    z-index: 1050;
    max-width: 380px;
    width: 90vw;
    background: var(--bg-surface);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 1rem 1.15rem;
    display: none;
    opacity: 0;
    transform: translateY(6px);
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.fn-popover.visible {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.popover-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    padding-bottom: 0.4rem;
    border-bottom: 1px solid var(--border-subtle);
}

.popover-title {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--accent);
}

.popover-close-btn {
    border: none;
    background: transparent;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 0.9rem;
    padding: 0.1rem 0.3rem;
}

.popover-body {
    font-size: 0.88rem;
    line-height: 1.55;
    color: var(--text-main);
}

.popover-footer {
    margin-top: 0.6rem;
    padding-top: 0.4rem;
    border-top: 1px solid var(--border-subtle);
    text-align: right;
}

.popover-jump-link {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
}

.popover-jump-link:hover {
    text-decoration: underline;
}

/* --------------------------------------------------------------------------
   Bibliography
   -------------------------------------------------------------------------- */

.bibliography-section ol {
    list-style-type: decimal;
    margin-left: 2rem;
}

.bibliography-section li {
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 0.75rem;
    text-align: left;
}

/* --------------------------------------------------------------------------
   Colophon
   -------------------------------------------------------------------------- */

.colophon-section {
    margin-top: 5rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-subtle);
}

.colophon-box {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 1.75rem;
}

.colophon-item h4 {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent);
    margin-bottom: 0.4rem;
}

.colophon-item p {
    font-size: 0.92rem;
    line-height: 1.62;
    color: var(--text-secondary);
    margin-bottom: 0;
    text-align: left;
}

/* --------------------------------------------------------------------------
   Citation Modal
   -------------------------------------------------------------------------- */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1100;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.55);
    backdrop-filter: blur(2px);
}

.modal-card {
    position: relative;
    z-index: 1110;
    width: 90%;
    max-width: 580px;
    background: var(--bg-surface);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 1.75rem;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
}

.modal-header h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-main);
}

.modal-close-btn {
    border: none;
    background: transparent;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--text-muted);
}

.cite-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-subtle);
    padding-bottom: 0.5rem;
}

.cite-tab-btn {
    background: transparent;
    border: none;
    padding: 0.35rem 0.75rem;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    border-radius: var(--radius-sm);
    cursor: pointer;
}

.cite-tab-btn.active {
    background: var(--accent-subtle);
    color: var(--accent);
}

.cite-panel {
    display: none;
}

.cite-panel.active {
    display: block;
}

.cite-code {
    background: var(--code-bg);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 1rem;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    line-height: 1.5;
    color: var(--text-main);
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-word;
    margin-bottom: 1rem;
}

.copy-cite-btn {
    width: 100%;
    padding: 0.6rem;
    background: var(--accent);
    color: #ffffff;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 0.88rem;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.copy-cite-btn:hover {
    background: var(--accent-hover);
}

/* --------------------------------------------------------------------------
   Responsive Breakpoints
   -------------------------------------------------------------------------- */

@media (max-width: 1200px) {
    .page-marker {
        display: inline;
        height: auto;
    }

    .page-marker-badge {
        display: none !important;
    }
}

@media (max-width: 900px) {
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        height: 100vh;
        z-index: 1020;
        transform: translateX(-100%);
        box-shadow: var(--shadow-lg);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-sticky {
        height: 100vh;
        top: 0;
        padding-top: 1.25rem;
    }

    .close-btn {
        display: inline-block;
    }

    .sidebar-backdrop.active {
        display: block;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.45);
        z-index: 1010;
    }

    .reader-main {
        padding: 2.5rem 1.25rem 5rem;
    }

    .topbar-branding {
        display: none;
    }
}

@media (max-width: 768px) {
    /* Hide font resize controls on mobile/tablets to prevent crowding */
    .font-controls,
    .topbar-right .divider {
        display: none;
    }
}

@media (max-width: 600px) {
    .topbar-inner {
        padding: 0 0.85rem;
    }

    .topbar-right .read-stats {
        display: none;
    }

    .theme-btn {
        padding: 0.25rem 0.45rem;
        font-size: 0.75rem;
    }

    .dialogue-turn {
        flex-direction: column;
        gap: 0.35rem;
    }

    .speaker-label {
        min-width: unset;
        display: inline-block;
        align-self: flex-start;
    }

    .section-content p {
        text-align: left;
    }
}

@media (max-width: 440px) {
    .cite-btn .btn-text {
        display: none;
    }

    .cite-btn {
        padding: 0.4rem 0.5rem;
    }
}

/* --------------------------------------------------------------------------
   Print Stylesheet
   -------------------------------------------------------------------------- */

@media print {
    #top-bar, #sidebar, .sidebar-backdrop, .fn-popover, #cite-modal, .quick-jump-bar {
        display: none !important;
    }

    body {
        background: #ffffff !important;
        color: #000000 !important;
        font-size: 11pt !important;
        line-height: 1.5 !important;
    }

    .reader-main {
        padding: 0 !important;
        max-width: 100% !important;
    }

    .paper-article {
        max-width: 100% !important;
    }

    .dialogue-card, .table-container, .footnote-item {
        break-inside: avoid;
    }
}