/* ========================================
   CSS Variables
======================================== */
:root {
    /* Colors - Book/Literary Theme */
    --primary-color: #2C3E50;
    --secondary-color: #E74C3C;
    --accent-color: #F39C12;
    --danger-color: #8E44AD;
    --text-primary: #2C3E50;
    --text-secondary: #7F8C8D;
    --text-light: #95A5A6;
    --background: #F8F4E6;
    --card-bg: #FFFFFF;
    --border-color: #E0D5C7;
    --settings-bg: #FDFCF8;
    --button-hover: #F5F5F5;
    
    /* Typography */
    --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans JP", sans-serif;
    --font-heading: "Noto Sans JP", sans-serif;
    --font-serif: "Noto Serif JP", serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 8px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 16px rgba(0,0,0,0.16);
    --shadow-xl: 0 16px 32px rgba(0,0,0,0.20);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ========================================
   Reset & Base Styles
======================================== */
*, *::before, *::after {
    box-sizing: border-box;
}

/* ========================================
   Reader Base Styles
======================================== */

.reader-body {
    margin: 0;
    padding: 0;
    background: var(--background);
    overflow-x: hidden;
    font-family: var(--font-main);
    color: var(--text-primary);
    line-height: 1.6;
    position: relative;
}

/* Font size variations */
.reader-body[data-font-size="small"] .chapter-body {
    font-size: 0.9rem;
}

.reader-body[data-font-size="medium"] .chapter-body {
    font-size: 1rem;
}

.reader-body[data-font-size="large"] .chapter-body {
    font-size: 1.2rem;
}

/* Line height variations */
.reader-body[data-line-height="normal"] .chapter-body {
    line-height: 1.6;
}

.reader-body[data-line-height="relaxed"] .chapter-body {
    line-height: 1.8;
}

.reader-body[data-line-height="loose"] .chapter-body {
    line-height: 2.0;
}

/* Font family variations */
.reader-body[data-font-family="sans"] .chapter-body {
    font-family: "Noto Sans JP", sans-serif;
}

.reader-body[data-font-family="serif"] .chapter-body {
    font-family: "Noto Serif JP", serif;
}

.reader-body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.03) 2px,
            rgba(0, 0, 0, 0.03) 4px
        );
    pointer-events: none;
    z-index: 1;
}

/* ========================================
   Header
======================================== */

.reader-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--text-primary);
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    z-index: 100;
    padding-bottom: 0;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    gap: var(--spacing-md);
}

.menu-toggle {
    display: flex;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: white;
    transition: all var(--transition-fast);
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

.header-info {
    flex: 1;
    text-align: center;
}

.book-title {
    font-size: 1.125rem;
    font-weight: 700;
    margin: 0;
    color: white;
    font-family: var(--font-serif);
    letter-spacing: 0.5px;
}

.current-chapter {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.8);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.speech-toggle,
.settings-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    color: rgba(255, 255, 255, 0.8);
    transition: color var(--transition-fast);
}

.speech-toggle:hover,
.settings-toggle:hover {
    color: white;
}

.speech-toggle.active {
    color: var(--accent-color);
}

.speech-toggle.active svg path {
    fill: currentColor;
}

.back-link {
    font-size: 0.875rem;
    color: var(--primary-color);
    text-decoration: none;
    padding: 6px 12px;
    border: 1px solid var(--primary-color);
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.back-link:hover {
    background: var(--primary-color);
    color: white;
}

/* Progress Bar */
.progress-bar {
    position: relative;
    height: 4px;
    background: var(--border-color);
}

.progress-fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background: var(--primary-color);
    transition: width var(--transition-normal);
}

.progress-text {
    position: absolute;
    right: var(--spacing-sm);
    top: -20px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* ========================================
   Container Layout
======================================== */

.reader-container {
    display: flex;
    margin-top: 60px;
    min-height: calc(100vh - 60px);
}

/* ========================================
   Table of Contents
======================================== */

.table-of-contents {
    width: 300px;
    background: white;
    border-right: 2px solid var(--border-color);
    height: calc(100vh - 60px);
    position: sticky;
    top: 60px;
    overflow-y: auto;
    transition: transform var(--transition-normal);
    box-shadow: 2px 0 5px rgba(0,0,0,0.05);
}

.table-of-contents.hidden {
    transform: translateX(-100%);
}

.toc-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 2px solid var(--border-color);
    background: var(--background);
}

.toc-title {
    font-size: 1.25rem;
    margin: 0;
    font-family: var(--font-serif);
    color: var(--text-primary);
}

.toc-home-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 4px;
    font-size: 0.875rem;
    transition: var(--transition-fast);
}

.toc-home-link:hover {
    background: var(--secondary-color);
    transform: translateY(-1px);
}

.toc-home-link svg {
    width: 18px;
    height: 18px;
}

.toc-content {
    padding: var(--spacing-md);
}

.toc-section {
    margin-bottom: var(--spacing-lg);
}

.toc-section h3 {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.toc-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.toc-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    border-radius: 0;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
    position: relative;
}

.toc-item:hover {
    background: var(--background);
    border-color: var(--border-color);
    transform: translateX(4px);
}

.toc-item.active {
    background: var(--text-primary);
    color: white;
    border-color: var(--text-primary);
    box-shadow: 2px 2px 0 rgba(0, 0, 0, 0.1);
}

.toc-item.active::after {
    content: '';
    position: absolute;
    left: -2px;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--secondary-color);
}

.toc-status {
    width: 20px;
    height: 20px;
    margin-right: var(--spacing-xs);
    display: flex;
    align-items: center;
    justify-content: center;
}

.toc-status.public {
    width: 0;
    margin-right: 0;
}

.toc-status.public::before {
    content: '';
    display: none;
}

.toc-status.restricted::before {
    content: '🔒';
    font-size: 14px;
}

.toc-text {
    flex: 1;
    font-size: 0.9rem;
}

.toc-pages {
    font-size: 0.75rem;
    color: var(--text-light);
    margin-left: var(--spacing-xs);
}

.toc-item.active .toc-pages {
    color: rgba(255, 255, 255, 0.8);
}

.toc-footer {
    padding: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.access-info {
    font-size: 0.875rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* ========================================
   Content Area
======================================== */

.content-area {
    flex: 1;
    padding: var(--spacing-xl);
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
}

.chapter-content {
    background: white;
    border-radius: 0;
    padding: var(--spacing-xxl);
    box-shadow: 0 0 20px rgba(0,0,0,0.08);
    width: 100%;
    box-sizing: border-box;
    border: 1px solid var(--border-color);
    position: relative;
}

/* External links in content */
.chapter-content .external-link {
    color: var(--secondary-color);
    text-decoration: none;
    border-bottom: 1px solid var(--secondary-color);
    transition: var(--transition-fast);
}

.chapter-content .external-link:hover {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    background: rgba(44, 62, 80, 0.05);
}

.chapter-title {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    font-family: var(--font-serif);
    letter-spacing: -0.5px;
    position: relative;
    padding-bottom: var(--spacing-md);
}

.chapter-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 80px;
    height: 3px;
    background: var(--secondary-color);
}

.chapter-subtitle {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xl);
    color: var(--text-secondary);
    font-weight: 400;
    font-family: var(--font-serif);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--border-color);
    font-style: italic;
}

.chapter-body {
    font-size: 1.125rem;
    line-height: 1.9;
    color: var(--text-primary);
    font-family: var(--font-serif);
    letter-spacing: 0.02em;
}

.chapter-body p {
    margin-bottom: var(--spacing-md);
    text-indent: 1em;
}

/* 章の導入文（「この章では...」）のスタイル */
.chapter-intro {
    font-size: 1.05rem;
    line-height: 1.9;
    color: var(--text-secondary);
    background: var(--background);
    padding: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    border-left: 4px solid var(--secondary-color);
    border-radius: 0;
    font-style: italic;
    box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.05);
}

.chapter-intro p {
    text-indent: 0;
    margin: 0;
}

.chapter-body h3 {
    font-size: 1.2rem;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    font-weight: 600;
}

/* 章末ポイント整理のスタイル */
.chapter-points-section {
    margin-top: var(--spacing-xxl);
    padding: var(--spacing-lg);
    background: #f8f9fa;
    border-radius: 8px;
    border: 1px solid #e9ecef;
}

.chapter-points {
    font-size: 0.875rem !important;
    font-weight: 600 !important;
    color: #6c757d !important;
    margin: 0 0 var(--spacing-md) 0 !important;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.chapter-points::before {
    content: "📌";
    font-size: 1rem;
}

/* 章末ポイントの箇条書き */
.chapter-points-section ul {
    margin: 0;
    padding-left: 0;
    list-style: none;
}

.chapter-points-section ul li {
    position: relative;
    padding-left: 1.75rem;
    margin-bottom: var(--spacing-sm);
    line-height: 1.7;
    color: #495057;
}

.chapter-points-section ul li::before {
    content: "▶";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-size: 0.75rem;
    top: 0.3em;
}

.chapter-points-section ul li:last-child {
    margin-bottom: 0;
}

/* 通常の箇条書きのスタイル */
.chapter-body ul:not(.in-points) {
    margin: var(--spacing-lg) 0;
    padding-left: 2em;
    list-style: none;
}

.chapter-body ul:not(.in-points) li {
    position: relative;
    margin-bottom: var(--spacing-sm);
    line-height: 1.8;
}

.chapter-body ul:not(.in-points) li::before {
    content: "•";
    position: absolute;
    left: -1.5em;
    color: var(--primary-color);
    font-weight: bold;
}

/* 区切り線のスタイル */
.chapter-body hr {
    border: none;
    height: 1px;
    background: var(--border-color);
    margin: var(--spacing-xxl) auto;
    width: 50%;
    opacity: 0.5;
}

/* 部のタイトルページ */
.part-title-page {
    min-height: 50vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: var(--spacing-xxl);
}

.part-title-page h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    font-family: var(--font-serif);
    letter-spacing: -1px;
    position: relative;
}

.part-title-page h1::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: var(--secondary-color);
}

.part-title-page .subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    font-style: italic;
}

/* 目次での部タイトルのスタイル */
.toc-status.part::before {
    content: '▸';
    font-size: 16px;
}

.toc-item.part-header {
    background: var(--background);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    border-left: 4px solid var(--text-primary);
    padding-left: calc(var(--spacing-sm) - 4px);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.toc-item.part-header:hover {
    background: #e1e9f0;
}

.toc-item.part-header.active {
    background: var(--primary-color);
    color: white;
}

.toc-item.part-header .toc-text {
    font-size: 0.95rem;
}

/* Chapter Navigation */
.chapter-footer {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 2px solid var(--border-color);
}

.chapter-nav {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    max-width: 600px;
    margin: 0 auto;
}

.nav-prev,
.nav-next {
    flex: 1;
    padding: 12px 24px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.nav-prev:hover:not(:disabled),
.nav-next:hover:not(:disabled) {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.nav-prev:disabled,
.nav-next:disabled {
    background: var(--text-light);
    cursor: not-allowed;
    opacity: 0.5;
}

/* Access Gate */
.access-gate {
    margin-top: var(--spacing-xxl);
    padding: var(--spacing-xl);
    background: var(--background);
    border-radius: 8px;
    text-align: center;
}

.gate-content h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.gate-content p {
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
}

.access-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    max-width: 600px;
    margin: 0 auto;
}

.access-method {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 0;
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.1);
    position: relative;
}

.access-method:hover {
    border-color: var(--secondary-color);
    transform: translate(-3px, -3px);
    box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.15);
}

.access-method:hover::after {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: var(--secondary-color);
    z-index: -1;
}

.method-icon {
    font-size: 2rem;
}

.method-text {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
}

/* Chapter Navigation */
.chapter-footer {
    margin-top: var(--spacing-xxl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.chapter-nav {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-md);
}

.nav-prev,
.nav-next {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--text-primary);
    border-radius: 0;
    cursor: pointer;
    font-size: 0.95rem;
    transition: all var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
    position: relative;
    overflow: hidden;
}

.nav-prev::before,
.nav-next::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--text-primary);
    transition: left 0.3s ease;
    z-index: -1;
}

.nav-prev:hover,
.nav-next:hover {
    color: white;
}

.nav-prev:hover::before,
.nav-next:hover::before {
    left: 0;
}

.nav-prev:disabled,
.nav-next:disabled {
    background: var(--border-color);
    color: var(--text-light);
    cursor: not-allowed;
}

/* ========================================
   Settings Panel
======================================== */

.settings-panel {
    width: 320px;
    background: var(--settings-bg);
    border-left: 1px solid var(--border-color);
    height: calc(100vh - 60px);
    position: fixed;
    right: 0;
    top: 60px;
    overflow-y: auto;
    transition: transform var(--transition-normal);
    transform: translateX(100%);
    z-index: 102;
    box-shadow: -4px 0 12px rgba(0, 0, 0, 0.1);
}

.settings-panel.active {
    transform: translateX(0);
}

.settings-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 2px solid var(--border-color);
    background: white;
}

.settings-header h3 {
    font-size: 1.25rem;
    margin: 0;
    color: var(--text-primary);
}

.settings-close {
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.settings-close:hover {
    color: var(--text-primary);
}

.settings-content {
    padding: var(--spacing-sm);
}

.setting-group {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    background: white;
    margin-bottom: var(--spacing-sm);
    border-radius: 4px;
}

.setting-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    display: block;
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.setting-controls {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
    flex-wrap: wrap;
    max-width: 100%;
}

/* Font size buttons */
.font-size-btn,
.line-height-btn,
.font-btn {
    flex: 1;
    padding: 8px 12px;
    background: white;
    border: 2px solid var(--border-color);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: 4px;
}

.font-size-btn:hover,
.line-height-btn:hover,
.font-btn:hover {
    background: var(--button-hover);
    border-color: var(--primary-color);
}

.font-size-btn.active,
.line-height-btn.active,
.font-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Theme controls */
.theme-controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
    gap: var(--spacing-sm);
    max-width: 320px;
}

.theme-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 8px;
    background: white;
    border: 2px solid var(--border-color);
    cursor: pointer;
    transition: all var(--transition-fast);
    border-radius: 4px;
}

.theme-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.theme-btn.active {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(44, 62, 80, 0.1);
}

.theme-preview {
    width: 40px;
    height: 30px;
    border-radius: 2px;
    border: 1px solid var(--border-color);
}

.theme-preview.light {
    background: #FFFFFF;
}

.theme-preview.dark {
    background: #2C3E50;
}

.theme-preview.sepia {
    background: #F4E8D0;
}

.theme-preview.dekoboko {
    background: linear-gradient(135deg, #4C51BF 0%, #ED8936 100%);
}

.theme-btn span:last-child {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Speech settings */
#speechRate {
    flex: 1;
    margin-right: var(--spacing-sm);
}

#speedValue {
    min-width: 2.5rem;
    font-weight: 600;
    color: var(--primary-color);
}

.voice-select {
    flex: 1;
    padding: 6px 10px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    background: white;
    font-size: 0.9rem;
}

.voice-preview-btn {
    padding: 6px 12px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: background var(--transition-fast);
}

.voice-preview-btn:hover {
    background: var(--secondary-color);
}

/* Reset button */
.reset-settings {
    width: 100%;
    padding: 10px;
    background: white;
    border: 2px solid var(--danger-color);
    color: var(--danger-color);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-weight: 600;
    border-radius: 4px;
}

.reset-settings:hover {
    background: var(--danger-color);
    color: white;
}

/* Font Size Controls */
.font-size-controls,
.line-height-controls,
.theme-controls,
.font-family-controls {
    display: flex;
    gap: var(--spacing-xs);
}

.font-size-btn,
.line-height-btn,
.theme-btn,
.font-btn {
    flex: 1;
    padding: var(--spacing-sm);
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: 0;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
}

.font-size-btn:hover,
.line-height-btn:hover,
.theme-btn:hover,
.font-btn:hover {
    border-color: var(--primary-color);
}

.font-size-btn.active,
.line-height-btn.active,
.theme-btn.active,
.font-btn.active {
    background: var(--text-primary);
    color: white;
    border-color: var(--text-primary);
    box-shadow: 2px 2px 0 rgba(0, 0, 0, 0.1);
}

.theme-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.theme-icon {
    font-size: 1.5rem;
}

.settings-footer {
    padding: var(--spacing-md);
}

.reset-settings {
    width: 100%;
    padding: var(--spacing-sm);
    background: white;
    border: 1px solid var(--danger-color);
    color: var(--danger-color);
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.reset-settings:hover {
    background: var(--danger-color);
    color: white;
}

/* Speech Settings */
.speech-settings {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* Voice Preview Button */
.voice-preview-btn {
    padding: 8px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.voice-preview-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.voice-preview-btn:active {
    transform: scale(0.95);
}

.voice-preview-btn svg {
    width: 20px;
    height: 20px;
}

.speech-speed-control,
.speech-voice-control {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.speech-speed-control label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    color: var(--text-primary);
}

#speedValue {
    font-weight: 600;
    color: var(--primary-color);
}

#speechRate {
    width: 100%;
    cursor: pointer;
}

#voiceSelect {
    width: 100%;
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: white;
    font-size: 0.9rem;
    cursor: pointer;
}

#voiceSelect:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Speech Highlight */
.sentence-highlight {
    background: rgba(231, 76, 60, 0.2);
    transition: background var(--transition-fast);
}

/* ========================================
   Modal
======================================== */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: 0;
    padding: var(--spacing-xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    border: 2px solid var(--text-primary);
    box-shadow: 5px 5px 0 rgba(0, 0, 0, 0.2);
}

.modal-close {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--background);
}

/* ========================================
   Access Forms
======================================== */

.access-form {
    max-width: 400px;
    margin: 0 auto;
}

.access-form h3 {
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group.checkbox label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
}

.form-group.checkbox input {
    width: auto;
    margin: 0;
}

.required {
    color: var(--danger-color);
}

.form-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
    margin-top: var(--spacing-lg);
}

.btn-primary,
.btn-secondary {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--text-primary);
    color: white;
    border: 2px solid var(--text-primary);
    position: relative;
    overflow: hidden;
}

.btn-primary::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: var(--secondary-color);
    transform: translate(-50%, -50%);
    transition: all 0.3s ease;
    border-radius: 50%;
}

.btn-primary:hover {
    background: var(--text-primary);
    border-color: var(--secondary-color);
    color: white;
}

.btn-primary:hover::after {
    width: 300px;
    height: 300px;
}

.btn-secondary {
    background: white;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--background);
}

.form-message {
    margin-top: var(--spacing-md);
}

.form-message p {
    padding: var(--spacing-sm);
    border-radius: 4px;
    margin: 0;
}

.form-message .success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.form-message .error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.form-message .info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

.form-message .note {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

.form-footer {
    margin-top: var(--spacing-md);
    text-align: center;
    font-size: 0.875rem;
}

.form-footer a {
    color: var(--primary-color);
    text-decoration: none;
}

.form-footer a:hover {
    text-decoration: underline;
}

/* ========================================
   Notifications
======================================== */

.notification {
    position: fixed;
    top: 100px;
    right: 20px;
    padding: var(--spacing-md) var(--spacing-lg);
    background: white;
    border-radius: 4px;
    box-shadow: var(--shadow-lg);
    z-index: 1001;
    opacity: 0;
    transform: translateX(100%);
    transition: all var(--transition-normal);
}

.notification.show {
    opacity: 1;
    transform: translateX(0);
}

.notification.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

/* ========================================
   Responsive
======================================== */

@media (max-width: 1024px) {
    .table-of-contents,
    .settings-panel {
        position: fixed;
        height: 100vh;
        top: 0;
        z-index: 101;
    }
    
    .table-of-contents {
        transform: translateX(-100%);
    }
    
    .table-of-contents.active {
        transform: translateX(0);
        box-shadow: var(--shadow-lg);
    }
    
    .content-area {
        padding: var(--spacing-md);
    }
}

@media (max-width: 768px) {
    .header-info {
        text-align: left;
    }
    
    .book-title {
        font-size: 1rem;
    }
    
    .current-chapter {
        font-size: 0.75rem;
    }
    
    .chapter-content {
        padding: var(--spacing-lg);
    }
    
    .chapter-title {
        font-size: 1.5rem;
    }
    
    .chapter-body {
        font-size: 1rem;
    }
    
    .access-methods {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   Special Content Styles (Pseudo Documents, SNS, etc.)
======================================== */

/* 疑似資料コンテナ */
.pseudo-document {
    position: relative;
    background: #FFF9E6;
    border: 2px dashed #D4AF37;
    border-radius: 8px;
    padding: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.pseudo-document::before {
    content: "📄 資料";
    position: absolute;
    top: -12px;
    left: 20px;
    background: white;
    padding: 0 10px;
    font-size: 0.85rem;
    color: #B8860B;
    font-weight: 600;
}

.pseudo-document-title {
    font-weight: 600;
    color: #8B7355;
    margin-bottom: var(--spacing-sm);
    font-size: 0.95rem;
}

.pseudo-document-note {
    font-style: italic;
    color: #999;
    font-size: 0.85rem;
    margin-top: var(--spacing-sm);
    text-align: right;
}

/* SNS投稿風スタイル */
.sns-post {
    background: #F8F9FA;
    border: 1px solid #E1E8ED;
    border-radius: 12px;
    padding: var(--spacing-md);
    margin: var(--spacing-lg) 0;
    position: relative;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.sns-post::before {
    content: "💬";
    position: absolute;
    top: 15px;
    left: 15px;
    font-size: 1.2rem;
}

.sns-post-content {
    margin-left: 35px;
    font-size: 0.95rem;
    line-height: 1.6;
}

.sns-post-meta {
    margin-left: 35px;
    margin-top: var(--spacing-sm);
    font-size: 0.8rem;
    color: #657786;
}

/* 特殊ノート・メモ */
.special-note {
    background: linear-gradient(180deg, #FFFEF7 0%, #FFF9E6 100%);
    border: 1px solid #E8DCC0;
    border-radius: 4px;
    padding: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    position: relative;
    font-family: "Klee One", "Noto Sans JP", sans-serif;
    box-shadow: 2px 2px 6px rgba(0,0,0,0.06);
}

.special-note::before {
    content: "📝";
    position: absolute;
    top: -10px;
    left: 20px;
    background: white;
    padding: 0 8px;
    font-size: 1.2rem;
}

.special-note-title {
    font-weight: 600;
    color: #6B5D4C;
    margin-bottom: var(--spacing-sm);
    text-decoration: underline;
    text-decoration-style: wavy;
    text-decoration-color: #D4AF37;
    text-underline-offset: 4px;
}

.special-note ul {
    list-style: none;
    padding-left: 0;
}

.special-note li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: var(--spacing-xs);
}

.special-note li::before {
    content: "□";
    position: absolute;
    left: 0;
    color: #B8860B;
}

.special-note li.checked::before {
    content: "☑";
    color: #4CAF50;
}

/* 内部対話・思考 */
.inner-thought {
    background: rgba(142, 68, 173, 0.05);
    border-left: 3px solid #8E44AD;
    padding: var(--spacing-md);
    margin: var(--spacing-lg) 0;
    font-style: italic;
    color: #6C5B7B;
}

/* 訪問記録・データ */
.data-record {
    background: #F0F4F8;
    border: 1px solid #CBD5E0;
    border-radius: 4px;
    padding: var(--spacing-md);
    margin: var(--spacing-lg) 0;
    font-family: "Courier New", monospace;
    font-size: 0.9rem;
}

.data-record-header {
    font-weight: 600;
    color: #2D3748;
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* 強調マーカー */
.highlight-important {
    background: linear-gradient(transparent 60%, #FFE082 60%);
    padding: 2px 0;
}

.highlight-danger {
    background: linear-gradient(transparent 60%, #FFCDD2 60%);
    padding: 2px 0;
}

.highlight-success {
    background: linear-gradient(transparent 60%, #C8E6C9 60%);
    padding: 2px 0;
}

/* ========================================
   Access Control Additions
======================================== */

.approved-password {
    background: #e8f5e9;
    border: 1px solid #4caf50;
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
}

.password-display {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 10px;
}

.password-display code {
    background: white;
    padding: 10px 15px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    flex: 1;
    user-select: all;
}

.copy-btn {
    background: #4caf50;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.copy-btn:hover {
    background: #45a049;
}

.copy-btn.copied {
    background: #2196f3;
}

.application-id {
    font-size: 0.9rem;
    color: #666;
    margin-top: 10px;
    font-family: monospace;
}

/* ========================================
   Pseudo Document Images
======================================== */

.pseudo-document-container {
    margin: var(--spacing-xl) auto;
    text-align: center;
    max-width: 700px;
}

.pseudo-document-image {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    border: 1px solid #ddd;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.pseudo-document-image:hover {
    transform: scale(1.02);
    box-shadow: 0 6px 20px rgba(0,0,0,0.2);
}

.pseudo-document-caption {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: #f9f9f9;
    border-radius: 4px;
    text-align: left;
}

.pseudo-document-caption .pseudo-document-title {
    font-weight: bold;
    color: #333;
    margin-bottom: var(--spacing-xs);
    font-size: 0.95em;
}

.pseudo-document-caption .pseudo-document-note {
    font-size: 0.85em;
    color: #666;
    font-style: italic;
}

.sns-post-container {
    margin: var(--spacing-xl) auto;
    text-align: center;
    max-width: 500px;
}

.sns-post-image {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    border: 1px solid #e1e8ed;
}

EOF < /dev/null