@import url('https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0/css/all.min.css'); /* Import Font Awesome */
@import url('https://fonts.googleapis.com/css2?family=Lato:wght@400;700&family=Open+Sans:wght@400;700&family=Roboto+Mono:wght@400;700&family=Merriweather:wght@400;700&family=Comic+Neue:wght@400;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans:wght@400;600;700&family=Space+Mono:wght@400;700&display=swap');

/* --- Base Styles --- */
:root {
    /* Default Light Theme Variables */
    --bg-primary: #f4f4f8;
    --bg-container: #fff;
    --text-primary: #333;
    --text-secondary: #555;
    --text-heading: #444;
    --text-link: #5c6bc0;
    --border-primary: #eee;
    --border-secondary: #ddd;
    --button-bg: #5c6bc0;
    --button-hover-bg: #3f51b5;
    --button-disabled-bg: #9fa8da;
    --button-text: #fff;
    --chapter-box-bg: #f9f9f9;
    --chapter-box-hover-bg: #f0f0f0;
    --chapter-tool-bg: #f0f0f0;
    --chapter-tool-hover-bg: #e0e0e0;
    --chapter-tool-text: #333;
    --bookmark-toc-bg: #fff9c4;
    --bookmark-toc-border: gold;
    --bookmark-chapter-border: gold;
    --h2-hover-bg: #f0f0f0;
    --input-bg: #fff;
    --input-border: #ddd;
    --input-text: #333;
    --collapse-label-bg: #e9e9ed;
    --collapse-label-hover-bg: #dcdcef;
    --collapse-label-border: #ccc;
    --collapse-label-text: #555;
    --font-family-base: 'Arial', sans-serif; /* Default font */
    --popup-bg: rgba(0, 0, 0, 0.6); /* Background overlay for popups */
    --popup-content-bg: var(--bg-container); /* Content background for popups */
    --image-control-bg: rgba(51, 51, 51, 0.6); /* Dark semi-transparent background for controls */
    --image-control-hover-bg: rgba(0, 0, 0, 0.8); /* Darker on hover */
    --image-control-text: #fff; /* White icons/text */
    --image-gen-error-bg: #ffebee; /* Light red background for errors */
    --image-gen-error-text: #c62828; /* Dark red text for errors */
    --image-preview-selected-border: #5c6bc0; /* Border color for selected images */
    --spinner-color: var(--button-bg); /* Spinner color */
    --drag-over-border-color: var(--text-link); /* Color for drop target indicator */

    /* Transitions */
    --transition-speed: 0.3s;
}

/* THEME: Lecture */
body.lecture-theme {
    --bg-primary: #f7f9fc;
    --bg-container: #ffffff;
    --text-primary: #1f2937;
    --text-heading: #0f172a;
    --text-secondary: #4b5563;
    --text-link: #1d4ed8;
    --border-primary: #e5e7eb;
    --border-secondary: #d1d5db;
    --button-bg: #1d4ed8;
    --button-hover-bg: #2563eb;
    --button-disabled-bg: #93c5fd;
    --button-text: #fff;
    --chapter-box-bg: #f8fafc;
    --chapter-box-hover-bg: #eef2ff;
    --chapter-tool-bg: #e5e7eb;
    --chapter-tool-hover-bg: #dbeafe;
    --chapter-tool-text: #1f2937;
    --bookmark-toc-bg: #fcd34d;
    --bookmark-toc-border: #f59e0b;
    --h2-hover-bg: #eef2ff;
    --input-bg: #fff;
    --input-border: #d1d5db;
    --input-text: #1f2937;
    --collapse-label-bg: #e5e7eb;
    --collapse-label-hover-bg: #d1d5db;
    --collapse-label-border: #93c5fd;
    --collapse-label-text: #4b5563;
    --popup-content-bg: #ffffff;
    font-family: 'Space Mono', monospace;
}

/* THEME: Book */
body.book-theme {
    --bg-primary: #f6f3ea;
    --bg-container: #ffffff;
    --text-primary: #2b2b2b;
    --text-heading: #3a2f1f;
    --text-secondary: #4a4030;
    --text-link: #7e4c1d;
    --border-primary: #e9e2d3;
    --border-secondary: #d8ceb9;
    --button-bg: #7e4c1d;
    --button-hover-bg: #a16432;
    --button-disabled-bg: #b9a89d;
    --button-text: #fff;
    --chapter-box-bg: #fbf8f1;
    --chapter-box-hover-bg: #f2eadb;
    --chapter-tool-bg: #d8ceb9;
    --chapter-tool-hover-bg: #e9e2d3;
    --chapter-tool-text: #2b2b2b;
    --bookmark-toc-bg: #f5e4b6;
    --bookmark-toc-border: #c89e3a;
    --h2-hover-bg: #f2eadb;
    --input-bg: #fff;
    --input-border: #d8ceb9;
    --input-text: #2b2b2b;
    --collapse-label-bg: #e9e2d3;
    --collapse-label-hover-bg: #d8ceb9;
    --collapse-label-border: #c8b9ac;
    --collapse-label-text: #4a4030;
    --popup-content-bg: #ffffff;
    font-family: 'Merriweather', serif;
}

/* THEME: Mystic Scroll (Dot Grid Pattern) */
body.mysticscroll-theme {
    --bg-primary: #f8f6ef;
    --bg-container: #fffdf6;
    --text-primary: #2c2a28;
    --text-heading: #4b3a2b;
    --text-secondary: #5a5146;
    --text-link: #6b4f2a;
    --border-primary: #e7dcc7;
    --border-secondary: #d7c7a8;
    --button-bg: #6b4f2a;
    --button-hover-bg: #96734c;
    --button-disabled-bg: #b9a89d;
    --button-text: #fff;
    --chapter-box-bg: #fff9ed;
    --chapter-box-hover-bg: #f7edd9;
    --chapter-tool-bg: #d7c7a8;
    --chapter-tool-hover-bg: #e7dcc7;
    --chapter-tool-text: #2c2a28;
    --bookmark-toc-bg: #f5e4b6;
    --bookmark-toc-border: #c89e3a;
    --h2-hover-bg: #f7edd9;
    --input-bg: #fffdf6;
    --input-border: #d7c7a8;
    --input-text: #2c2a28;
    --collapse-label-bg: #e7dcc7;
    --collapse-label-hover-bg: #d7c7a8;
    --collapse-label-border: #d7c7a8;
    --collapse-label-text: #5a5146;
    --popup-content-bg: #fffdf6;
    background-image: radial-gradient(#f3e8d9 1px, transparent 1px), radial-gradient(#f3e8d9 1px, transparent 1px);
    background-position: 0 0, 10px 10px;
    background-size: 20px 20px, 20px 20px;
    font-family: 'Noto Sans', system-ui, sans-serif;
}

/* THEME: Dark Mode (Robust Definition) */
body.dark-mode {
    --bg-primary: #121212;
    --bg-container: #1e1e1e;
    --text-primary: #e0e0e0;
    --text-secondary: #aaaaaa;
    --text-heading: #ffffff;
    --text-link: #9fa8da;
    --border-primary: #333333;
    --border-secondary: #444444;
    --button-bg: #5c6bc0;
    --button-hover-bg: #7986cb;
    --button-disabled-bg: #454d68;
    --button-text: #fff;
    --chapter-box-bg: #282828;
    --chapter-box-hover-bg: #383838;
    --chapter-tool-bg: #333;
    --chapter-tool-hover-bg: #555;
    --chapter-tool-text: #ccc;
    --bookmark-toc-bg: #33301a;
    --bookmark-toc-border: #b5a044;
    --bookmark-chapter-border: #b5a044;
    --h2-hover-bg: #333;
    --input-bg: #282828;
    --input-border: #444;
    --input-text: #e0e0e0;
    --collapse-label-bg: #282828;
    --collapse-label-hover-bg: #333;
    --collapse-label-border: #444;
    --collapse-label-text: #aaaaaa;
    --popup-content-bg: #1e1e1e;
}

/* THEME: Sepia Mode */
body.sepia-mode {
    --bg-primary: #fbf0d9;
    --bg-container: #fffcf0;
    --text-primary: #4e4035;
    --text-secondary: #6e6055;
    --text-heading: #5c4b3f;
    --text-link: #8d6e63;
    --border-primary: #e0d5c0;
    --border-secondary: #d4c8b8;
    --button-bg: #8d6e63;
    --button-hover-bg: #a1887f;
    --button-disabled-bg: #c8b9ac;
    --button-text: #fff;
    --chapter-box-bg: #f9f5ed;
    --chapter-box-hover-bg: #e5e0d4;
    --chapter-tool-bg: #e0d5c0;
    --chapter-tool-hover-bg: #d4c8b8;
    --chapter-tool-text: #4e4035;
    --bookmark-toc-bg: #f5e4b6;
    --bookmark-toc-border: #c89e3a;
    --h2-hover-bg: #e5e0d4;
    --input-bg: #fffcf0;
    --input-border: #d4c8b8;
    --input-text: #4e4035;
    --collapse-label-bg: #e0d5c0;
    --collapse-label-hover-bg: #d4c8b8;
    --collapse-label-border: #c8b9ac;
    --collapse-label-text: #6e6055;
    --popup-content-bg: #fffcf0;
    font-family: 'Merriweather', serif;
}

/* THEME: High Contrast Mode (Black/Yellow/White) */
body.high-contrast-mode {
    --bg-primary: #000;
    --bg-container: #fff;
    --text-primary: #000;
    --text-secondary: #333;
    --text-heading: #000;
    --text-link: #ffcc00;
    --border-primary: #333;
    --border-secondary: #000;
    --button-bg: #000;
    --button-hover-bg: #333;
    --button-disabled-bg: #888;
    --button-text: #ffcc00;
    --chapter-box-bg: #eee;
    --chapter-box-hover-bg: #ccc;
    --chapter-tool-bg: #000;
    --chapter-tool-hover-bg: #333;
    --chapter-tool-text: #fff;
    --bookmark-toc-bg: #ffcc00;
    --bookmark-toc-border: #cc9900;
    --h2-hover-bg: #ccc;
    --input-bg: #fff;
    --input-border: #000;
    --input-text: #000;
    --collapse-label-bg: #000;
    --collapse-label-hover-bg: #333;
    --collapse-label-border: #000;
    --collapse-label-text: #fff;
    --popup-content-bg: #fff;
    --popup-bg: rgba(0, 0, 0, 0.9);
    font-family: 'Space Mono', monospace;
}

/* THEME: Terminal Green Mode */
body.terminal-green {
    --bg-primary: #000;
    --bg-container: #111;
    --text-primary: #00ff00;
    --text-secondary: #00aa00;
    --text-heading: #00ff00;
    --text-link: #00ffff;
    --border-primary: #003300;
    --border-secondary: #005500;
    --button-bg: #007700;
    --button-hover-bg: #00aa00;
    --button-disabled-bg: #003300;
    --button-text: #000;
    --chapter-box-bg: #0a0a0a;
    --chapter-box-hover-bg: #1a1a1a;
    --chapter-tool-bg: #005500;
    --chapter-tool-hover-bg: #007700;
    --chapter-tool-text: #00ff00;
    --bookmark-toc-bg: #222;
    --bookmark-toc-border: #00ff00;
    --h2-hover-bg: #1a1a1a;
    --input-bg: #0a0a0a;
    --input-border: #005500;
    --input-text: #00ff00;
    --collapse-label-bg: #003300;
    --collapse-label-hover-bg: #005500;
    --collapse-label-border: #005500;
    --collapse-label-text: #00ff00;
    --popup-content-bg: #111;
    --popup-bg: rgba(0, 255, 0, 0.1);
    font-family: 'Space Mono', monospace;
}

/* THEME: Parchment (Old Book Paper Texture) */
body.parchment {
    --bg-primary: #e6d8b9;
    --bg-container: #fffbe6;
    --text-primary: #453e35;
    --text-secondary: #655d54;
    --text-heading: #50483f;
    --text-link: #925c46;
    --border-primary: #d4c8b2;
    --border-secondary: #c9bda4;
    --button-bg: #925c46;
    --button-hover-bg: #a3725b;
    --button-disabled-bg: #b9a89d;
    --button-text: #fff;
    --chapter-box-bg: #fffdf4;
    --chapter-box-hover-bg: #f0ead4;
    --chapter-tool-bg: #c9bda4;
    --chapter-tool-hover-bg: #d4c8b2;
    --chapter-tool-text: #453e35;
    --bookmark-toc-bg: #f5e4b6;
    --bookmark-toc-border: #c89e3a;
    --h2-hover-bg: #f0ead4;
    --input-bg: #fffdf4;
    --input-border: #c9bda4;
    --input-text: #453e35;
    --collapse-label-bg: #d4c8b2;
    --collapse-label-hover-bg: #c9bda4;
    --collapse-label-border: #c9bda4;
    --collapse-label-text: #655d54;
    --popup-content-bg: #fffbe6;
    background-image: url('old_paper.png'); /* Use the asset */
    background-size: cover;
    background-attachment: fixed;
    font-family: 'Merriweather', serif;
}

/* THEME: Blueprint Mode (Dark Blue/Cyan/Yellow) */
body.blueprint {
    --bg-primary: #022038;
    --bg-container: #003366;
    --text-primary: #fff;
    --text-secondary: #a0c0ff;
    --text-heading: #ffff00;
    --text-link: #00ffff;
    --border-primary: #0055aa;
    --border-secondary: #0077dd;
    --button-bg: #00ffff;
    --button-hover-bg: #00aaff;
    --button-disabled-bg: #005577;
    --button-text: #022038;
    --chapter-box-bg: #004488;
    --chapter-box-hover-bg: #0055aa;
    --chapter-tool-bg: #0077dd;
    --chapter-tool-hover-bg: #0099ff;
    --chapter-tool-text: #fff;
    --bookmark-toc-bg: #ffff00;
    --bookmark-toc-border: #ffaa00;
    --h2-hover-bg: #0055aa;
    --input-bg: #003366;
    --input-border: #0077dd;
    --input-text: #fff;
    --collapse-label-bg: #0055aa;
    --collapse-label-hover-bg: #0077dd;
    --collapse-label-border: #0077dd;
    --collapse-label-text: #fff;
    --popup-content-bg: #003366;
    font-family: 'Roboto Mono', monospace;
}

/* THEME: Newspaper Mode (Minimal Black/White/Grey) */
body.newspaper {
    --bg-primary: #f0f0f0;
    --bg-container: #fff;
    --text-primary: #000;
    --text-secondary: #444;
    --text-heading: #111;
    --text-link: #333;
    --border-primary: #ddd;
    --border-secondary: #bbb;
    --button-bg: #333;
    --button-hover-bg: #555;
    --button-disabled-bg: #888;
    --button-text: #fff;
    --chapter-box-bg: #fff;
    --chapter-box-hover-bg: #eee;
    --chapter-tool-bg: #ccc;
    --chapter-tool-hover-bg: #bbb;
    --chapter-tool-text: #000;
    --bookmark-toc-bg: #ffc;
    --bookmark-toc-border: #cc0;
    --h2-hover-bg: #eee;
    --input-bg: #fff;
    --input-border: #bbb;
    --input-text: #000;
    --collapse-label-bg: #ccc;
    --collapse-label-hover-bg: #bbb;
    --collapse-label-border: #bbb;
    --collapse-label-text: #444;
    --popup-content-bg: #fff;
    font-family: 'Times New Roman', serif;
}

/* THEME: Minimalist (Very clean, high contrast light) */
body.minimalist {
    --bg-primary: #ffffff;
    --bg-container: #f9f9f9;
    --text-primary: #111;
    --text-secondary: #444;
    --text-heading: #000;
    --text-link: #0070c0;
    --border-primary: #eee;
    --border-secondary: #ddd;
    --button-bg: #0070c0;
    --button-hover-bg: #005a9c;
    --button-disabled-bg: #ccc;
    --button-text: #fff;
    --chapter-box-bg: #f9f9f9;
    --chapter-box-hover-bg: #eee;
    --chapter-tool-bg: #eee;
    --chapter-tool-hover-bg: #ddd;
    --chapter-tool-text: #111;
    --bookmark-toc-bg: #fcf8e3;
    --bookmark-toc-border: #f8e1a1;
    --h2-hover-bg: #eee;
    --input-bg: #fff;
    --input-border: #ddd;
    --input-text: #111;
    --collapse-label-bg: #eee;
    --collapse-label-hover-bg: #ddd;
    --collapse-label-border: #ccc;
    --collapse-label-text: #444;
    --popup-content-bg: #fff;
    font-family: 'Open Sans', sans-serif;
}

/* THEME: Hacker Neon (Extreme Dark Mode) */
body.hacker-neon {
    --bg-primary: #00000a;
    --bg-container: #080812;
    --text-primary: #00ffff;
    --text-secondary: #00aaff;
    --text-heading: #ff00ff;
    --text-link: #ff00ff;
    --border-primary: #330033;
    --border-secondary: #550055;
    --button-bg: #007777;
    --button-hover-bg: #009999;
    --button-disabled-bg: #330033;
    --button-text: #00000a;
    --chapter-box-bg: #110011;
    --chapter-box-hover-bg: #220022;
    --chapter-tool-bg: #330033;
    --chapter-tool-hover-bg: #550055;
    --chapter-tool-text: #00ffff;
    --bookmark-toc-bg: #330000;
    --bookmark-toc-border: #ff0000;
    --h2-hover-bg: #220022;
    --input-bg: #110011;
    --input-border: #550055;
    --input-text: #00ffff;
    --collapse-label-bg: #330033;
    --collapse-label-hover-bg: #550055;
    --collapse-label-border: #550055;
    --collapse-label-text: #00aaff;
    --popup-content-bg: #080812;
    font-family: 'Roboto Mono', monospace;
    text-shadow: 0 0 2px rgba(0, 255, 255, 0.6);
    /* Neon glow for headers */
    h1, h2, h3 { text-shadow: 0 0 5px rgba(255, 0, 255, 0.7); }
}

body {
    font-family: var(--font-family-base); /* Use variable */
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    background-image: url('initial-background.jpg'); /* Initial background image */
    background-size: cover;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-position: center;
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease, font-family var(--transition-speed) ease, background-image var(--transition-speed) ease; /* Smooth transitions */
    min-height: 100vh; /* Ensure body takes full height */
    box-sizing: border-box;
}

/* Only show thumbnail backgrounds for generation complete popup and settings */
.generation-complete-popup,
#settings-popup {
    background-size: 400px 300px !important;
    background-position: top right !important;
    background-repeat: no-repeat !important;
}

.generation-complete-content,
.settings-content {
    background-size: 300px 200px !important;
    background-position: top right !important;
    background-repeat: no-repeat !important;
    background-attachment: local !important;
}

/* Add styles for main content area */
#app-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    max-width: 1000px; /* Adjust max-width as needed */
    margin: 0 auto; /* Center the main container */
}

/* General Container Styling */
#input-area,
#table-of-contents,
#book-content,
#below-footer-zone,
footer, /* Apply general styling to footer too */
.settings-content,
/*.welcome-content,*/ /* Style welcome content separately below */
.custom-language-content,
.ai-prompt-content,
.image-popup-content,
.export-content {
    background-color: var(--bg-container);
    color: var(--text-primary);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    padding: 20px;
    box-sizing: border-box;
    transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease, color var(--transition-speed) ease; /* Smooth transitions */
    width: 100%; /* Make sections take full width of container */
    margin-bottom: 20px; /* Add space between sections */
}

h1, h2, h3, h4 { /* Include h4 */
    color: var(--text-heading); /* Use heading color */
    margin-top: 0; /* Consistent top margin removal */
}

a {
    color: var(--text-link); /* Use link color */
}
a:hover {
    color: var(--button-hover-bg); /* Darken on hover */
}

h1 {
    font-size: 2.2em; /* Slightly larger */
    margin-bottom: 30px; /* More space below title */
    font-weight: bold;
    text-shadow: 0 0 8px rgba(0, 255, 255, 0.5), 0 0 15px rgba(0, 255, 255, 0.5); /* Subtler glow */
    border: 2px solid #0ff;
    padding: 10px 15px;
    border-radius: 8px;
    display: inline-block;
    text-align: center; /* Center the main title */
    /* Add white outline */
    -webkit-text-stroke: 1px white; /* For WebKit browsers */
    text-stroke: 1px white;
    paint-order: stroke fill; /* Ensure stroke is drawn behind fill */
    color: #666; /* Ensure text color is set */
}

/* --- Section Specific Styles --- */
#input-area {
    display: flex;
    flex-direction: column;
    gap: 15px; /* Space between elements */
    max-width: 600px; /* Make input area narrower than others */
}

#input-area.collapsed {
    display: none;
}

#input-text, /* Shared styles for textareas */
#background-regenerate-prompt,
.ai-prompt-command-input {
    padding: 12px;
    border: 1px solid var(--input-border);
    border-radius: 6px;
    font-size: 16px;
    resize: vertical;
    font-family: inherit;
    background-color: var(--input-bg);
    color: var(--input-text);
    box-sizing: border-box; /* Include padding in width/height */
    width: 100%; /* Take full width */
}

#input-text {
    min-height: 100px;
}

#background-regenerate-prompt {
    margin-bottom: 10px; /* Space before button */
}

#upper-menu {
    display: flex;
    gap: 10px;
    flex-wrap: wrap; /* Allow buttons to wrap on smaller screens */
    justify-content: center;
}

#upper-menu button,
#generate-button,
#reset-button,
#menu-button,
.chapter-save-button,
.chapter-cancel-button,
/*.popup-close-button,*/ /* Style popup close separately */
.ai-prompt-enter-button,
#insert-selected-images-button,
#generate-images-button,
#regenerate-background-button, /* Style for new button */
/*#close-welcome,*/ /* Style welcome action separately */
.custom-language-content button,
.welcome-action-button /* Style for the main welcome button */
 {
    padding: 10px 20px;
    background-color: var(--button-bg);
    color: var(--button-text);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color var(--transition-speed) ease, transform 0.1s ease;
    font-family: inherit;
}

#upper-menu button:hover,
#generate-button:hover,
#reset-button:hover,
#menu-button:hover,
.chapter-save-button:hover,
.chapter-cancel-button:hover,
/*.popup-close-button:hover,*/
.ai-prompt-enter-button:hover,
#insert-selected-images-button:hover,
#generate-images-button:hover,
#regenerate-background-button:hover,
/*#close-welcome:hover,*/
.custom-language-content button:hover,
.welcome-action-button:hover {
    background-color: var(--button-hover-bg);
    transform: translateY(-1px); /* Slight lift effect */
}

#generate-button:disabled,
.ai-prompt-enter-button:disabled,
#insert-selected-images-button:disabled,
#generate-images-button:disabled,
#regenerate-background-button:disabled,
#goto-bookmark-button:disabled {
    background-color: var(--button-disabled-bg);
    cursor: not-allowed;
    transform: none;
}

#menu-button {
    padding: 6px 12px;
    font-size: 14px;
    position: absolute; /* Position relative to body/container */
    top: 25px;
    left: 25px;
}

#menu-button + #save-status-indicator {
    position: absolute;
    left: 25px;
    top: 60px;
}
#save-status-indicator {
    width: 10px; height: 10px; border-radius: 50%;
    border: 1px solid var(--border-secondary);
}
#save-status-indicator { position: static; display: inline-block; margin-left: 4px; vertical-align: middle; transform: translateY(1px); }
#save-status-indicator.green { background-color: #2e7d32; }
#save-status-indicator.red { background-color: #d32f2f; }

#reset-button {
    background-color: #d32f2f; /* Red for reset */
}
#reset-button:hover {
    background-color: #b71c1c;
}

.chapter-cancel-button,
.custom-language-content #cancel-custom-language {
    background-color: #777;
}
.chapter-cancel-button:hover,
.custom-language-content #cancel-custom-language:hover {
    background-color: #555;
}

#table-of-contents,
#book-content,
#below-footer-zone,
footer {
    max-width: 800px; /* Ensure these are wider than input-area */
}

#table-of-contents h2 {
     margin-bottom: 15px;
}

#chapters-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: flex-start;
}

.chapter-box {
    border: 1px solid var(--border-secondary);
    padding: 10px 15px;
    border-radius: 6px;
    background-color: var(--chapter-box-bg);
    flex-grow: 1;
    flex-basis: 180px;
    box-sizing: border-box;
    transition: all var(--transition-speed) ease;
    text-decoration: none;
    color: var(--text-primary);
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.chapter-box:hover {
    background-color: var(--chapter-box-hover-bg);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    transform: translateY(-1px);
}

/* Highlight bookmarked TOC item */
.chapter-box.bookmarked-toc-item {
    background-color: var(--bookmark-toc-bg);
    border: 1.7px solid var(--bookmark-toc-border);
    font-weight: bold;
    position: relative;
    padding-left: 26px !important;
}

.chapter-box .bm-icon {
    /* Use Font Awesome or Unicode bookmark */
    display: inline-block;
    font-size: 1.25em;
    vertical-align: middle;
    margin-right: 5px;
    margin-left: -22px;
    color: #eab308; /* Gold/yellow */
    position: absolute;
    left: 9px;
    top: 50%;
    transform: translateY(-53%);
    width: 19px;
    text-align: center;
    pointer-events: none;
    line-height: 1;
    /* If using fa-bookmark, it will get default size from .bm-icon */
}

.chapter-box.bookmarked-toc-item .bm-icon {
    color: #eab308;
    filter: drop-shadow(0 1px 1px #c59d0c44);
}

.chapter.bookmarked-chapter {
    border-left: 5px solid var(--bookmark-chapter-border);
    padding-left: 15px;
}

#toc-heading { cursor: pointer; }

/* TOC views - Updated with new detailed view and tool view */
#table-of-contents.view-list #chapters-container { 
    display: flex; 
    flex-direction: column; 
    gap: 8px; 
}
#table-of-contents.view-list #chapters-container .chapter-box { 
    width: 100% !important; 
    white-space: normal; 
    flex-basis: auto;
    min-height: 40px;
    display: flex;
    align-items: center;
    font-size: 1em;
    padding: 12px 15px;
}
#table-of-contents.view-compact #chapters-container .chapter-box { 
    flex-basis: 140px; 
    width: 140px; 
    font-size: 0.9em; 
    padding: 8px 10px; 
}

/* New: Detailed list view */
#table-of-contents.view-detailed #chapters-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
#table-of-contents.view-detailed #chapters-container .chapter-box {
    width: 100% !important;
    white-space: normal;
    flex-basis: auto;
    min-height: 60px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    font-size: 1em;
    padding: 15px 18px;
    position: relative;
}
#table-of-contents.view-detailed .chapter-box::after {
    content: attr(data-chapter-num);
    position: absolute;
    top: 8px;
    right: 12px;
    font-size: 0.8em;
    color: var(--text-secondary);
    opacity: 0.6;
}
#table-of-contents.view-detailed .chapter-meta {
    font-size: 0.85em;
    color: var(--text-secondary);
    margin-top: 6px;
    display: flex;
    gap: 12px;
}

/* New: TOC Tool view for chapter management */
#table-of-contents.view-tool #chapters-container {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
#table-of-contents.view-tool #chapters-container .chapter-box {
    width: 100% !important;
    white-space: normal;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 15px;
    border: 2px solid var(--border-secondary);
    cursor: grab;
}
#table-of-contents.view-tool #chapters-container .chapter-box:active {
    cursor: grabbing;
    opacity: 0.7;
}

/* Hide chapter tools in normal views (list, compact, detailed) */
#table-of-contents.view-list .chapter-box-tools,
#table-of-contents.view-compact .chapter-box-tools,
#table-of-contents.view-detailed .chapter-box-tools {
    display: none !important;
}

/* Show chapter tools only in tool view */
#table-of-contents.view-tool .chapter-box-tools {
    display: flex;
    gap: 6px;
    margin-left: auto;
    padding-left: 12px;
}

#table-of-contents.view-tool .chapter-tool-icon {
    background: linear-gradient(135deg, var(--chapter-tool-bg) 0%, var(--bg-container) 100%);
    border: 1px solid var(--border-secondary);
    border-radius: 6px;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

#table-of-contents.view-tool .chapter-tool-icon:hover {
    background: linear-gradient(135deg, var(--button-bg) 0%, var(--button-hover-bg) 100%);
    color: var(--button-text);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

#table-of-contents.view-tool .chapter-tool-icon.delete-chapter:hover {
    background: linear-gradient(135deg, #d32f2f 0%, #b71c1c 100%);
}

#table-of-contents.view-tool .chapter-tool-icon.add-after:hover {
    background: linear-gradient(135deg, #388e3c 0%, #2e7d32 100%);
}

#table-of-contents.view-tool .toc-add-chapter-btn {
    margin-top: 12px;
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, var(--button-bg) 0%, var(--button-hover-bg) 100%);
    color: var(--button-text);
    border: 2px dashed var(--border-secondary);
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: bold;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

#table-of-contents.view-tool .toc-add-chapter-btn:hover {
    border-style: solid;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

/* --- Chapter Styling --- */
.chapter {
    margin-bottom: 30px;
    border: 1px solid var(--border-secondary);
    border-radius: 10px;
    padding: 20px;
    position: relative;
    background-color: var(--bg-container);
    transition: outline var(--transition-speed) ease;
}

.chapter.collapsed {
    padding-top: 10px;
    padding-bottom: 10px;
}

.chapter.collapsed .chapter-content,
.chapter.collapsed .chapter-tools,
.chapter.collapsed > h2,
.chapter.collapsed .image-container,
.chapter.collapsed .chapter-edit-controls {
    display: none;
}

.chapter.collapsed > .chapter-collapse-label {
    font-weight: bold;
    display: block;
    margin-bottom: 0;
    padding: 10px 15px;
    border-bottom: none;
}

.chapter.collapsed > .chapter-collapse-label::before {
    content: attr(data-chapter-title);
    display: inline;
    margin-right: 0;
}

.chapter-collapse-label {
    cursor: pointer;
    padding: 8px 0px 8px 12px;
    background-color: var(--collapse-label-bg);
    border: none;
    outline: 0;
    border-radius: 5px;
    display: block !important;
    font-size: 14px;
    color: var(--collapse-label-text);
    transition: background-color var(--transition-speed) ease;
    clear: both;
    margin-top: 10px;
    margin-bottom: 0;
    float: none;
    min-width: 100%;
    width: 100%;
    text-align: left;
    box-sizing: border-box;
    font-weight: bold;
    line-height: 21px;
}

.chapter-collapse-label:hover {
    background-color: var(--collapse-label-hover-bg);
    filter: brightness(0.97);
}

.chapter.collapsed > .chapter-collapse-label {
    margin-bottom: 0;
    border-bottom: none;
    padding-bottom: 6px;
}

.chapter-content {
    margin-bottom: 10px;
    overflow: hidden;
    padding-right: 40px;
    position: relative;
}

.chapter-content h2 {
    color: var(--text-heading);
    margin-top: 0;
    margin-bottom: 15px;
    border-bottom: 1px solid var(--border-primary);
    padding-bottom: 8px;
    font-size: 1.5em;
    transition: background-color var(--transition-speed) ease;
    cursor: default;
    padding-right: 20px;
    display: inline-block;
    max-width: calc(100% - 40px);
}

.chapter-content h2:hover {
     background-color: var(--h2-hover-bg);
     border-radius: 4px;
}

.chapter-content h2[style*="cursor: pointer"] {
    cursor: pointer;
    text-decoration: underline dashed;
    text-decoration-color: var(--text-link);
}

.chapter-title-edit-input {
    box-sizing: border-box;
}

.chapter-content p {
    line-height: 1.7;
    color: var(--text-secondary);
    margin-top: 0;
    margin-bottom: 1.2em;
    text-align: justify;
    position: relative;
}

.chapter-content p.tts-start {
    border: 2px solid var(--text-link);
    background-color: rgba(92,107,192,0.08);
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(92,107,192,0.12);
    padding: 6px 10px;
    transition: background-color 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.tts-active-paragraph {
    background-color: rgba(0, 0, 0, 0.05);
    border-left: 3px solid var(--text-link);
    padding-left: 10px;
    border-radius: 8px;
    transition: background-color 0.3s ease;
}

.tts-active-word {
    text-decoration: underline;
    font-weight: bold;
    background-color: rgba(255, 255, 0, 0.3);
    border-radius: 2px;
    padding: 0 1px;
}

.chapter-content .image-container {
    position: relative;
    max-width: 100%;
    margin: 15px auto;
    border-radius: 4px;
    overflow: hidden;
    cursor: grab;
}

.chapter-content .image-container.dragging {
    opacity: 0.5;
    cursor: grabbing;
}

.chapter-content .image-container img {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    margin: 0;
    -webkit-user-drag: none;
    user-select: none;
    -moz-user-select: none;
    -webkit-user-select: none;
    -ms-user-select: none;
}

.chapter-content .image-container img.round-cutout {
    border-radius: 50%;
    overflow: hidden;
    max-width: 60%;
    margin: 15px auto;
}

.image-controls {
    position: absolute;
    top: 5px;
    right: 5px;
    background-color: var(--image-control-bg);
    border-radius: 4px;
    padding: 3px;
    display: flex;
    gap: 3px;
    opacity: 0;
    transition: opacity var(--transition-speed) ease;
    z-index: 5;
}

.image-container:hover .image-controls {
    opacity: 1;
}

.image-control-button {
    background-color: transparent;
    border: none;
    color: var(--image-control-text);
    cursor: pointer;
    font-size: 16px;
    line-height: 1;
    padding: 4px;
    border-radius: 3px;
    transition: background-color var(--transition-speed) ease;
}

.image-control-button:hover {
    background-color: var(--image-control-hover-bg);
}

.image-control-button.delete:hover {
     background-color: #d32f2f;
}

.image-control-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: transparent !important;
}

/* --- Chapter Tools Menu --- */
.chapter-tools {
    position: absolute;
    top: 15px;
    right: 15px;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    z-index: 10;
}

.tool-toggle-button {
    background-color: var(--chapter-tool-bg);
    border: 1px solid var(--border-secondary);
    border-radius: 50%;
    width: 30px;
    height: 30px;
    padding: 0;
    cursor: pointer;
    transition: background-color var(--transition-speed) ease, transform var(--transition-speed) ease;
    font-size: 18px;
    line-height: 30px;
    text-align: center;
    color: var(--chapter-tool-text);
    margin-bottom: 5px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.tool-toggle-button:hover {
    background-color: var(--chapter-tool-hover-bg);
    transform: scale(1.1);
}

.tool-options {
    display: flex;
    flex-direction: column;
    gap: 5px;
    overflow: hidden;
    max-height: 500px;
    transition: max-height var(--transition-speed) ease-out, opacity var(--transition-speed) ease-out;
    opacity: 1;
}

.chapter-tools.tools-collapsed .tool-options {
    max-height: 0;
    opacity: 0;
    pointer-events: none;
}

.chapter-tool-button {
    background-color: var(--chapter-tool-bg);
    border: 1px solid var(--border-secondary);
    border-radius: 50%;
    width: 30px;
    height: 30px;
    padding: 0;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    font-size: 16px;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--chapter-tool-text);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.chapter-tool-button:hover {
    background-color: var(--chapter-tool-hover-bg);
    transform: scale(1.1);
}

.chapter-tool-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: var(--chapter-tool-bg);
    transform: none;
}

/* --- Fullscreen Reader Styles --- */
.fullscreen-reader {
    font-family: 'Georgia', 'Times New Roman', serif;
}

.fullscreen-reader-content {
    scrollbar-width: thin;
    scrollbar-color: #ccc transparent;
}

.fullscreen-reader-content::-webkit-scrollbar {
    width: 8px;
}

.fullscreen-reader-content::-webkit-scrollbar-track {
    background: transparent;
}

.fullscreen-reader-content::-webkit-scrollbar-thumb {
    background: #ccc;
    border-radius: 4px;
}

.fullscreen-reader-content::-webkit-scrollbar-thumb:hover {
    background: #999;
}

.fullscreen-reader-menu button:focus {
    outline: 2px solid rgba(255, 255, 255, 0.5);
    outline-offset: 2px;
}

/* Hide ugly ```html text at top */
body > .hljs,
body > pre,
body > code {
    display: none !important;
}

/* Also hide any stray HTML rendering at the very top */
body::before {
    content: none !important;
}

/* --- Updated AI Command Console Icon --- */
#ai-command-console:before {
    content: '🤖 ';
    font-size: 1.25em;
    margin-right: 5px;
    vertical-align: middle;
}

#ai-command-console {
    border-bottom: 1px solid var(--border-secondary);
    padding-bottom: 10px;
    margin-bottom: 10px;
    min-height: 28px;
    font-size: 1em;
}

.chapter-box .bm-icon {
    font-size: 1.25em;
    vertical-align: middle;
}

.chapter-box.bookmarked-toc-item {
    background-color: var(--bookmark-toc-bg);
    border: 1px solid var(--bookmark-toc-border);
    font-weight: bold;
}

.chapter.bookmarked-chapter {
    border-left: 5px solid var(--bookmark-chapter-border);
    padding-left: 15px;
}

/* --- Editing State --- */
.chapter-content.editing {
    border: 1px dashed var(--text-link);
    padding: 10px;
    background-color: #fdfdff;
}

.chapter-edit-controls {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 15px;
    padding-top: 10px;
    border-top: 1px solid var(--border-primary);
}

/* --- Popups --- */
.ai-prompt-popup,
.welcome-popup,
.custom-language-popup,
.image-popup,
.export-popup,
.format-popup,
.sources-links-popup,
.prompt-analyze-popup,
.educate-popup {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: var(--popup-bg);
    display: none;
    justify-content: center;
    align-items: flex-start; /* Start from top for better mobile experience */
    z-index: 10000;
    padding: 10px;
    box-sizing: border-box;
    overflow-y: auto; /* Allow popup container to scroll */
}

.welcome-popup {
     z-index: 10002 !important;
     display: flex !important;
}

.ai-prompt-content,
.welcome-content,
.custom-language-content,
.image-popup-content,
.export-content,
.format-popup-content,
.sources-links-content,
.prompt-analyze-content,
.educate-content {
    background-color: var(--popup-content-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    position: relative;
    width: 100%;
    max-width: 95vw;
    min-height: auto;
    max-height: calc(100vh - 20px);
    display: flex;
    flex-direction: column;
    overflow-y: auto; /* Make content scrollable */
    margin: auto 0; /* Center vertically when content is smaller than screen */
}

/* Specific max-widths for different popup types */
.ai-prompt-content {
    max-width: min(900px, 95vw);
}

.welcome-content {
    max-width: min(600px, 95vw);
    text-align: center;
}

.custom-language-content {
    max-width: min(400px, 95vw);
    text-align: center;
}

.image-popup-content {
    max-width: min(1100px, 95vw);
    max-height: 95vh;
    overflow-y: auto;
}

.export-content {
    max-width: min(900px, 95vw);
}

.format-popup-content {
    max-width: min(900px, 95vw);
    gap: 15px;
}

.sources-links-content {
    max-width: min(590px, 95vw);
}

.prompt-analyze-content {
    max-width: min(570px, 95vw);
    min-width: min(310px, 90vw);
}

.educate-content {
    max-width: min(800px, 95vw);
}

/* Mobile-specific popup adjustments */
@media (max-width: 768px) {
    .ai-prompt-popup,
    .welcome-popup,
    .custom-language-popup,
    .image-popup,
    .export-popup,
    .format-popup,
    .sources-links-popup,
    .prompt-analyze-popup,
    .educate-popup {
        padding: 5px;
        align-items: flex-start;
    }
    
    .ai-prompt-content,
    .welcome-content,
    .custom-language-content,
    .image-popup-content,
    .export-content,
    .format-popup-content,
    .sources-links-content,
    .prompt-analyze-content,
    .educate-content {
        width: 100%;
        max-width: 100vw;
        margin: 0;
        padding: 15px;
        border-radius: 4px;
        max-height: calc(100vh - 10px);
    }
    
    /* Reduce font sizes slightly on mobile for better fit */
    .ai-prompt-content h3,
    .welcome-content h2,
    .export-content h2,
    .educate-content h2 {
        font-size: 1.3em;
    }
}

/* Enhanced scrollbar styling for popup content */
.ai-prompt-content::-webkit-scrollbar,
.welcome-content::-webkit-scrollbar,
.custom-language-content::-webkit-scrollbar,
.image-popup-content::-webkit-scrollbar,
.export-content::-webkit-scrollbar,
.format-popup-content::-webkit-scrollbar,
.sources-links-content::-webkit-scrollbar,
.prompt-analyze-content::-webkit-scrollbar,
.educate-content::-webkit-scrollbar {
    width: 8px;
}

.ai-prompt-content::-webkit-scrollbar-track,
.welcome-content::-webkit-scrollbar-track,
.custom-language-content::-webkit-scrollbar-track,
.image-popup-content::-webkit-scrollbar-track,
.export-content::-webkit-scrollbar-track,
.format-popup-content::-webkit-scrollbar-track,
.sources-links-content::-webkit-scrollbar-track,
.prompt-analyze-content::-webkit-scrollbar-track,
.educate-content::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

.ai-prompt-content::-webkit-scrollbar-thumb,
.welcome-content::-webkit-scrollbar-thumb,
.custom-language-content::-webkit-scrollbar-thumb,
.image-popup-content::-webkit-scrollbar-thumb,
.export-content::-webkit-scrollbar-thumb,
.format-popup-content::-webkit-scrollbar-thumb,
.sources-links-content::-webkit-scrollbar-thumb,
.prompt-analyze-content::-webkit-scrollbar-thumb,
.educate-content::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 4px;
}

.ai-prompt-content::-webkit-scrollbar-thumb:hover,
.welcome-content::-webkit-scrollbar-thumb:hover,
.custom-language-content::-webkit-scrollbar-thumb:hover,
.image-popup-content::-webkit-scrollbar-thumb:hover,
.export-content::-webkit-scrollbar-thumb:hover,
.format-popup-content::-webkit-scrollbar-thumb:hover,
.sources-links-content::-webkit-scrollbar-thumb:hover,
.prompt-analyze-content::-webkit-scrollbar-thumb:hover,
.educate-content::-webkit-scrollbar-thumb:hover {
    background: #a1a1a1;
}

/* --- Footer Styles --- */
footer {
    text-align: center;
    margin-top: 30px;
    padding: 10px 15px;
    background-color: transparent;
    border: none;
    box-shadow: none;
    width: fit-content;
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 10px;
}

footer p {
    margin: 0;
    font-size: 0.85em;
    color: var(--text-secondary);
}
#project-version {
    font-weight: bold;
    color: var(--text-link);
}
footer p:after {
    content: '';
}

footer a {
    color: var(--text-secondary);
    text-decoration: underline;
}

footer a:hover {
    color: var(--text-link);
}

.prompt-textarea-container {
    position: relative;
    border: 1px solid var(--border-secondary);
    border-radius: 8px;
    transition: all 0.2s ease;
    background-color: var(--input-bg);
}

.prompt-textarea-container:focus-within {
    border-color: var(--text-link);
    box-shadow: 0 0 0 2px rgba(92, 107, 192, 0.2);
}

.prompt-textarea-container textarea {
    width: 100%;
    padding: 12px;
    border: none;
    outline: none;
    background-color: transparent; 
    color: var(--text-primary);
    font-family: inherit;
    resize: vertical;
    border-radius: 7px;
    font-size: 1em;
    line-height: 1.5;
}

.prompt-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    padding: 0 8px 8px;
}

.prompt-actions button {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px 8px;
    font-size: 0.85em;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.prompt-actions button:hover {
    background-color: var(--chapter-box-hover-bg);
}

.prompt-actions button#analyze-chapter-btn {
    display: flex;
    align-items: center;
    gap: 5px;
    color: var(--text-link);
}

.prompt-actions button#analyze-chapter-btn:hover {
    background-color: rgba(92, 107, 192, 0.1);
}

#analysis-progress {
    margin-top: 5px;
    font-size: 0.9em;
    color: var(--text-secondary);
    padding: 6px 10px;
    border-radius: 4px;
    background-color: var(--chapter-box-bg);
}

.paragraph-editor {
    border: 1px solid var(--border-secondary);
    border-radius: 6px;
    padding: 15px;
    background-color: var(--chapter-box-bg);
    position: relative;
    transition: all 0.2s ease;
}

.paragraph-editor:hover {
    border-color: var(--button-bg);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.paragraph-text {
    width: 100%;
    min-height: 100px;
    padding: 10px;
    box-sizing: border-box;
    border: 1px solid var(--border-secondary);
    border-radius: 4px;
    font-family: inherit;
    font-size: 1em;
    line-height: 1.5;
    background-color: var(--input-bg);
    color: var(--input-text);
    resize: vertical;
}

.paragraph-text:focus {
    border-color: var(--button-bg);
    outline: none;
    box-shadow: 0 0 0 2px rgba(92, 107, 192, 0.2);
}

.paragraph-controls {
    display: flex;
    justify-content: space-between;
    margin-top: 10px;
    gap: 10px;
}

.paragraph-controls button {
    transition: all 0.2s ease;
}

.paragraph-controls button:hover {
    transform: translateY(-2px);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.size-btn.decrease:hover {
    background-color: #f0f0f0;
}

.size-btn.increase:hover {
    background-color: #f0f0f0;
}

.action-btn.regenerate:hover {
    background-color: #3f51b5;
}

.action-btn.delete:hover {
    background-color: #b71c1c;
}

.add-paragraph:hover {
    background-color: #3f51b5;
    transform: translateY(-2px);
}

.word-count {
    font-size: 0.85em;
    color: var(--text-secondary);
    margin-top: 5px;
    text-align: right;
}

.export-popup {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--popup-bg);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 10001;
    padding: 15px;
    box-sizing: border-box;
}

.export-content {
    background-color: var(--popup-content-bg);
    padding: 25px 30px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    position: relative;
    width: 90%;
    max-width: 900px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.export-description {
    text-align: center;
    margin-bottom: 20px;
}

.export-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: 20px;
}

.export-option {
    border: 1px solid var(--border-secondary);
    border-radius: 6px;
    padding: 15px;
    background-color: var(--chapter-box-bg);
    transition: all 0.2s ease;
}

.export-option:hover {
    border-color: var(--button-bg);
    box-shadow: 0 3px 8px rgba(0,0,0,0.1);
    transform: translateY(-2px);
}

.export-option h3 {
    margin-top: 0;
    margin-bottom: 8px;
    color: var(--text-heading);
    display: flex;
    align-items: center;
    gap: 8px;
}

.export-option p {
    color: var(--text-secondary);
    margin-bottom: 15px;
    font-size: 0.9em;
}

.export-option-settings {
    margin: 15px 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.export-option-settings label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.export-option-settings input[type="checkbox"] {
    width: auto;
    margin: 0;
}

.export-option-settings select {
    margin-top: 5px;
    width: 100%;
    padding: 6px;
    border: 1px solid var(--border-secondary);
    border-radius: 4px;
    background-color: var(--bg-container);
}

.export-format-button, 
#export-to-jbg-button {
    width: 100%;
    padding: 10px;
    background-color: var(--button-bg);
    color: var(--button-text);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    margin-top: 5px;
    transition: background-color 0.2s ease, transform 0.1s ease;
}

.export-format-button:hover,
#export-to-jbg-button:hover {
    background-color: var(--button-hover-bg);
    transform: translateY(-1px);
}

#export-to-jbg-button {
    background-color: var(--chapter-tool-bg);
    color: var(--chapter-tool-text);
    border: 1px solid var(--border-secondary);
}

#export-to-jbg-button:hover {
    background-color: var(--chapter-tool-hover-bg);
}

.export-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 20px;
}

.export-status {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-top: 20px;
    padding: 10px;
    border-radius: 6px;
    background-color: var(--chapter-box-bg);
    color: var(--text-secondary);
}

.export-status .loading-spinner {
    width: 20px;
    height: 20px;
}

/* --- TTS Browser Controls live preview feedback --- */
#tts-preview-button, .tts-effect-control {
    transition: background-color 0.2s, color 0.2s;
}
#tts-preview-button:active {
    background-color: var(--button-hover-bg);
}

#tts-settings .changed-indicator {
    display: inline-block;
    background: #fbc02d;
    color: #212121;
    border-radius: 4px;
    font-size: 0.89em;
    padding: 2px 7px;
    margin-left: 10px;
    font-weight: bold;
    animation: pulseEffect 1s alternate infinite;
}
@keyframes pulseEffect {
    to { box-shadow: 0 0 6px #ffe082; }
}

.tts-effect-applied {
    font-style: normal;color: #66a67e; font-weight: bold;
}

.tts-preview-row {
    margin-top: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* --- Add styles for sources/links popup and containers --- */
.sources-links-popup {
    position: fixed !important;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: rgba(0,0,0,0.6);
    z-index: 10020;
    display: flex;
    align-items: center;
    justify-content: center;
}
.sources-links-content {
    background: var(--popup-content-bg,#fff);
    border-radius: 8px;
    box-shadow: 0 6px 32px rgba(0,0,0,.17);
    padding: 30px 25px;
    max-width: 590px;
    width: 94vw;
    position: relative;
    display: flex;
    flex-direction: column;
}

.sources-links-popup .popup-close-button {
    position:absolute;
    top:8px; right:13px;
    background:none; border:none;
    font-size:24px; cursor:pointer;
    color: var(--text-secondary,#636363);
}
.sources-links-popup .popup-close-button:hover {
    color: var(--text-link,#3699f3);
}
.sources-links-popup h3 {
    margin-top:0;margin-bottom:0;
}
.sources-links-popup input[type="text"]#sources-search-input {
    padding:10px;
    border-radius:5px;
    border:1px solid var(--input-border,#ccc);
    font-size:1em;
    width:100%;
    margin-top:3px;
}
.sources-links-popup button {
    margin-top:6px;
}
.sources-links-result {
    border:1px solid #e0e0e0;
    border-radius:6px;
    margin-bottom:9px;
    padding: 10px 12px;
    background: #fafbfc;
    transition: background 0.15s, border 0.15s;
    position:relative;
    cursor:pointer;
}

.sources-links-result.selected {
    background: #dbeafe;
    border:1.7px solid #3699f3;
}

.sources-links-result .checkmark {
    position:absolute;
    top:10px;right:12px;
    font-size:1.07em;
    color: #3b82f6;
    display:none;
}
.sources-links-result.selected .checkmark { display:inline; }
.sources-links-link {
    font-weight:bold;
    color:#2563eb;
    text-decoration:underline;
    word-break:break-all;
}
.sources-links-title {
    font-size:1.02em;
    margin-bottom:2px;
}
.sources-links-desc {
    font-size:0.94em;
    color:var(--text-secondary,#555);
    margin:3px 0 0 0;
}

.chapter-sources-container {
    margin-top:28px;
    border-top:2px dotted var(--border-secondary,#bbb);
    padding:10px 0 0 0;
}
.chapter-sources-container > div:first-child {
    color:var(--text-link,#5c6bc0);
    font-weight:bold;
    margin-bottom:7px;
    font-size:1.13em;
}
.chapter-source-link {
    margin-bottom:7px;
}
.chapter-source-link a {
    font-weight:bold;
    color:#2563eb;
    text-decoration:underline;
    word-break:break-all;
}
.chapter-source-link span {
    font-size:0.92em;
    color:var(--text-secondary,#777);
    display:block;
    margin-top:2px;
}

/* --- Share Buttons in Settings --- */
.share-buttons-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 10px;
    justify-content: center; /* Center buttons if they wrap */
}

.share-button {
    padding: 8px 12px;
    background-color: var(--button-bg);
    color: var(--button-text);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9em;
    display: inline-flex; /* Allows icon and text to align nicely */
    align-items: center;
    gap: 6px; /* Space between icon and text */
    transition: background-color var(--transition-speed) ease;
    text-decoration: none; /* For potential <a> tag usage if needed */
}

.share-button:hover {
    background-color: var(--button-hover-bg);
}

.share-button i { /* Font Awesome icon styling */
    font-size: 1.1em; /* Slightly larger icon */
    line-height: 1; /* Ensure proper vertical alignment */
}

.input-analyze-btn {
    position: absolute;
    right: 46px; /* Moved to make room for mic button */
    top: 11px;
    background: rgba(255,255,255,0.97);
    border: 1px solid #bbb;
    border-radius: 50%;
    width: 28px;
    height: 28px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 17px;
    z-index: 30;
    padding: 0;
    margin: 0;
    cursor: pointer;
    box-shadow: 0 1px 3px rgba(0,0,0,0.07);
    transition: background 0.15s;
    color: var(--text-link);
}

.input-analyze-btn i.fas.fa-lightbulb {
    font-size: 15px;
    color: var(--text-link);
    pointer-events: none;
}

.input-analyze-btn:hover {
    background: #eef4ff;
}

.input-mic-btn {
    position: absolute; 
    right: 12px; 
    top: 11px;
    background: rgba(255,255,255,0.97); 
    border: 1px solid #bbb;
    border-radius: 50%; 
    width: 28px; 
    height: 28px; 
    display: flex; 
    justify-content: center; 
    align-items: center;
    font-size: 16px; 
    z-index: 30; 
    cursor: pointer; 
    box-shadow: 0 1px 3px rgba(0,0,0,0.07); 
    transition: background 0.15s; 
    color: var(--text-link);
}

.input-mic-btn:hover { 
    background: #eef4ff; 
}

.input-mic-btn i.fas.fa-microphone,
.input-mic-btn i.fas.fa-stop {
    font-size: 14px;
    pointer-events: none;
}

.prompt-analyze-popup {
    position: fixed !important;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: rgba(36,39,51,.49);
    z-index: 6000;
    display: flex;
    justify-content: center;
    align-items: center;
}

.prompt-analyze-content {
    max-width: 570px;
    width: 97vw;
    background: white;
    border-radius: 11px;
    box-shadow: 0 7px 40px rgba(0,0,0,.19);
    padding: 28px 28px 18px 28px;
    position: relative;
    min-width: 310px;
}

.prompt-analyze-content h3 {
    margin-top: 0;
}

.prompt-analyze-close {
    position: absolute !important;
    top: 12px;
    right: 14px;
    font-size: 22px;
    background: none;
    border: none;
    cursor: pointer;
    color: #636363;
}
.prompt-analyze-close:hover {
    color: #3e6ae1;
}

.prompt-analyze-content .loading-spinner {
    width: 17px; height: 17px; border: 2px solid #ccc; border-top-color: #5c6bc0;
    border-radius: 50%; display: inline-block; vertical-align: middle;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===== MOUSEOVER INFO POPUPS (TOOLTIP) ===== */
.info-tooltip {
    position: absolute;
    z-index: 3000;
    background: #333;
    color: #fff;
    padding: 8px 13px;
    border-radius: 7px;
    font-size: 0.97em;
    line-height: 1.5;
    min-width: 90px;
    max-width: 280px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.21);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.15s;
    left: 0; /* Will be positioned dynamically */
    top: 0;
    white-space: pre-line;
    word-break: break-word;
}

.info-tooltip.visible {
    opacity: 0.97;
}

/* --- Add styles for educate popup --- */
.educate-popup {
    position: fixed !important;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: rgba(0,0,0,0.6);
    z-index: 10020;
    display: flex;
    align-items: center;
    justify-content: center;
}

.educate-content {
    background: var(--popup-content-bg,#fff);
    border-radius: 8px;
    box-shadow: 0 6px 32px rgba(0,0,0,.17);
    padding: 30px 25px;
    max-width: 800px;
    width: 97vw;
    position: relative;
    display: flex;
    flex-direction: column;
    max-height: 90vh;
    overflow-y: auto;
}

.educate-popup .popup-close-button {
    position: absolute;
    top: 8px; right: 13px;
    background: none; border: none;
    font-size: 24px; cursor: pointer;
    color: var(--text-secondary,#636363);
}

.educate-popup .popup-close-button:hover {
    color: var(--text-link,#3699f3);
}

.educate-format-card {
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    padding: 15px;
    cursor: pointer;
    transition: all 0.2s;
    background: #fafbfc;
}

.educate-format-card:hover {
    border-color: #9ca3af;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.educate-format-card.selected {
    border-color: #5c6bc0;
    background: #f0f4ff;
}

.chapter-educational-container {
    margin-top: 28px;
    border-top: 2px dotted var(--border-secondary,#bbb);
    padding: 15px 0 0 0;
}

.chapter-educational-container > div:first-child {
    color: var(--text-link,#5c6bc0);
    font-weight: bold;
    margin-bottom: 10px;
    font-size: 1.13em;
}

.chapter-educational-item {
    margin-bottom: 15px;
    border: 1px solid #e5e7eb;
    border-radius: 6px;
    padding: 12px;
    background: #f9fafb;
}

.chapter-educational-item > div:first-child {
    font-weight: bold;
    color: #374151;
    margin-bottom: 8px;
}

.book-library-popup {
    position: fixed !important;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: rgba(36,39,51,.49);
    z-index: 6000;
    display: flex;
    justify-content: center;
    align-items: center;
}

.book-library-content {
    max-width: 95vw;
    width: 1200px;
    background: white;
    border-radius: 11px;
    box-shadow: 0 7px 40px rgba(0,0,0,.19);
    padding: 28px;
    position: relative;
    max-height: 90vh;
    overflow-y: auto;
}

.book-library-close {
    position: absolute !important;
    top: 12px;
    right: 14px;
    font-size: 22px;
    background: none;
    border: none;
    cursor: pointer;
    color: #636363;
}

.book-library-close:hover {
    color: #3e6ae1;
}

.book-card {
    border: 2px solid #e5e7eb;
    border-radius: 12px;
    padding: 16px;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    min-height: 200px;
}

.book-card:hover {
    border-color: #5c6bc0;
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(92,107,192,0.15);
}

.book-card h4 {
    margin: 0 40px 8px 0;
    color: #1e293b;
    font-size: 1.1em;
    line-height: 1.3;
}

.book-card .select-book-btn {
    background: #5c6bc0;
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.85em;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.2s ease;
}

.book-card .select-book-btn:hover {
    background: #3f51b5;
}

/* --- Export Analysis Popup Styles --- */
.export-analysis-popup {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: var(--popup-bg);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 10001;
    padding: 15px;
    box-sizing: border-box;
}

.export-analysis-content {
    background-color: var(--popup-content-bg);
    padding: 25px 30px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    position: relative;
    width: 95%;
    max-width: 1200px;
    max-height: 95vh;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.analysis-tabs {
    display: flex;
    border-bottom: 2px solid var(--border-secondary);
    margin-bottom: 20px;
    gap: 5px;
}

.tab-btn {
    padding: 12px 24px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 16px;
    border-bottom: 3px solid transparent;
    transition: all 0.2s ease;
}

.tab-btn.active {
    border-bottom-color: var(--button-bg);
    color: var(--button-bg);
    font-weight: bold;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.analysis-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 15px;
    margin-bottom: 25px;
}

.analysis-card {
    background: var(--chapter-box-bg);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-secondary);
}

.analysis-card h4 {
    margin-top: 0;
    color: var(--button-bg);
    font-size: 1.1em;
    display: flex;
    align-items: center;
    gap: 8px;
}

.summaries-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 15px;
}

.summary-card {
    background: var(--bg-container);
    padding: 15px;
    border-radius: 6px;
    border-left: 4px solid var(--button-bg);
}

.summary-card h5 {
    margin-top: 0;
    color: var(--text-heading);
}

.charts-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 20px;
}

.chart-section {
    background: var(--chapter-box-bg);
    padding: 20px;
    border-radius: 8px;
    text-align: center;
}

.chart-section canvas {
    max-width: 100%;
    height: auto;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 15px;
}

.download-option {
    background: var(--chapter-box-bg);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-secondary);
    text-align: center;
    transition: all 0.2s ease;
}

.download-option:hover {
    border-color: var(--button-bg);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.download-btn {
    width: 100%;
    padding: 10px;
    background-color: var(--button-bg);
    color: var(--button-text);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    margin-top: 10px;
    transition: background-color 0.2s ease;
}

.download-btn:hover {
    background-color: var(--button-hover-bg);
}

.download-btn:disabled {
    background-color: var(--button-disabled-bg);
    cursor: not-allowed;
}

.export-section {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-secondary);
}

.export-section:last-child {
    border-bottom: none;
}

.analysis-option {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-secondary);
    text-align: center;
}

.analysis-button {
    padding: 15px 30px;
    background: linear-gradient(135deg, var(--button-bg), var(--button-hover-bg));
    color: var(--button-text);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: all 0.2s ease;
    margin-top: 10px;
}

.analysis-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(92, 107, 192, 0.3);
}

.analysis-button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

/* Add chart analysis popup styles */
.chart-analysis-popup {
    position: fixed !important;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: rgba(36,39,51,.49);
    z-index: 6000;
    display: flex;
    justify-content: center;
    align-items: center;
}

.chart-analysis-content {
    background: var(--popup-content-bg,#fff);
    border-radius: 8px;
    box-shadow: 0 6px 32px rgba(0,0,0,.17);
    padding: 30px 25px;
    max-width: 850px;
    width: 98%;
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 18px;
    max-height: 90vh;
    overflow-y: auto;
}

.chart-analysis-popup .popup-close-button {
    position: absolute;
    top: 8px; right: 13px;
    background: none; border: none;
    font-size: 24px; cursor: pointer;
    color: var(--text-secondary,#636363);
}

.chart-analysis-popup .popup-close-button:hover {
    color: var(--text-link,#3699f3);
}

.chart-suggestion-card {
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 12px;
    background: #fafbfc;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.chart-suggestion-card:hover {
    border-color: #9ca3af;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.chart-suggestion-card.selected {
    border-color: #5c6bc0;
    background: #f0f4ff;
}

.chapter-charts-container {
    margin-top: 28px;
    border-top: 2px dotted var(--border-secondary,#bbb);
    padding: 15px 0 0 0;
}

.chapter-charts-container > div:first-child {
    color: var(--text-link,#5c6bc0);
    font-weight: bold;
    margin-bottom: 10px;
    font-size: 1.13em;
}

.chapter-chart-item {
    margin-bottom: 15px;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 15px;
    background: #f9fafb;
}

/* Charts and diagrams integration styles */
.chapter-charts-container svg {
    width: 100%;
    height: auto;
    max-height: 200px;
    border: 1px solid var(--border-secondary);
    border-radius: 6px;
    background: #fafbfc;
    margin: 10px 0;
}

/* Enhanced sources links popup with insert functionality */
.chapter-source-link .insert-link-btn {
    background: #059669;
    color: white;
    border: none;
    border-radius: 4px;
    padding: 4px 8px;
    cursor: pointer;
    font-size: 0.8em;
    transition: background-color 0.2s ease;
}

.chapter-source-link .insert-link-btn:hover {
    background: #047857;
}

.chapter-source-link .insert-link-btn:disabled {
    background: #666;
    cursor: not-allowed;
}

/* Generation complete popup styles */
.generation-complete-popup {
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    background: rgba(25,32,47,0.85);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 15000;
    backdrop-filter: blur(8px);
    background-image: none !important;
}

.generation-complete-content {
    background: #fff !important;
    background-image: none !important;
    background: linear-gradient(145deg, #ffffff 0%, #f8f9fa 100%);
    border-radius: 20px;
    padding: 40px 35px;
    max-width: 520px;
    width: 90vw;
    text-align: center;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3), 0 5px 20px rgba(0,0,0,0.15);
    border: 1px solid rgba(255,255,255,0.8);
    position: relative;
    overflow: hidden;
}

/* Thumbnails ensure fit on all screens */
.image-preview-item img { width: 100%; height: 150px; object-fit: cover; border-radius: 6px; display: block; }
.image-preview-item { border: 1px solid var(--border-secondary); border-radius: 8px; padding: 6px; background: var(--chapter-box-bg); cursor: pointer; }
.image-preview-item.selected { outline: 2px solid var(--image-preview-selected-border); }

/* Make insert button prominent and always reachable */
#insert-selected-images-button { position: sticky; bottom: 0; background: var(--button-bg); font-weight: 700; }

.fs-theme-dark { background:#111 !important; }
.fs-theme-dark .fullscreen-reader-content{ color:#f2f2f2 !important; }
.fs-theme-oldbook { background:#3a2f1f !important; }
.fs-theme-oldbook .fullscreen-reader-content{ color:#2b2b2b; background:url('./old_paper.png') center/cover repeat; box-shadow: inset 0 0 120px rgba(0,0,0,.2); }
.fs-theme-minimal .fullscreen-reader-content{ background:#fff; color:#222; }
.fs-theme-book .fullscreen-reader-content{ background:#f6f3ea; color:#2b2b2b; }
.tints-magic .tint-word{
    opacity:0;
    filter:drop-shadow(0 0 0px rgba(0,128,255,0.0));
    animation:tintReveal 1.1s ease-out forwards;
}
@keyframes tintReveal{
  0%{opacity:0; text-shadow:0 0 12px rgba(0,136,255,0.9);}
  50%{opacity:.85; text-shadow:0 0 7px rgba(0,136,255,0.5);}
  100%{opacity:1; text-shadow:0 0 0 rgba(0,136,255,0);}
}