@import url('https://fonts.googleapis.com/css2?family=Ma+Shan+Zheng&family=Noto+Serif+TC:wght@400;600;700&family=ZCOOL+XiaoWei&display=swap');

:root {
    --bg-primary: #f5f0e6;
    --bg-paper: #faf6ed;
    --bg-header: #8b4513;
    --text-primary: #2c1810;
    --text-secondary: #5c4033;
    --accent: #8b0000;
    --accent-light: #a52a2a;
    --border: #c4a574;
    --border-dark: #8b7355;
    --gold: #d4af37;
    --shadow: rgba(44, 24, 16, 0.15);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Serif TC', 'SimSun', serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.9;
    min-height: 100vh;
    background-image: 
        url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23c4a574' fill-opacity='0.08'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.book-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
}

.book-header {
    text-align: center;
    padding: 60px 20px;
    background: linear-gradient(135deg, var(--bg-paper) 0%, #f0e6d3 100%);
    border: 3px double var(--border);
    margin-bottom: 30px;
    position: relative;
    box-shadow: 
        0 4px 20px var(--shadow),
        inset 0 0 100px rgba(196, 165, 116, 0.1);
}

.book-header::before,
.book-header::after {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 200px;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

.book-header::before { top: 20px; }
.book-header::after { bottom: 20px; }

.header-decoration {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 20px;
}

.header-decoration.bottom {
    margin-top: 20px;
    margin-bottom: 0;
}

.decoration-line {
    width: 80px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-dark), transparent);
}

.decoration-symbol {
    color: var(--gold);
    font-size: 1.2em;
}

.book-title {
    font-family: 'Ma Shan Zheng', 'ZCOOL XiaoWei', cursive;
    font-size: 4rem;
    color: var(--accent);
    text-shadow: 2px 2px 4px rgba(139, 0, 0, 0.2);
    letter-spacing: 0.3em;
    margin-bottom: 10px;
}

.book-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    letter-spacing: 0.5em;
    margin-bottom: 15px;
}

.book-author {
    font-size: 1rem;
    color: var(--text-secondary);
    letter-spacing: 0.2em;
}

.toc-container {
    background: var(--bg-paper);
    border: 2px solid var(--border);
    padding: 30px;
    margin-bottom: 30px;
    display: none;
    box-shadow: 0 4px 20px var(--shadow);
}

.toc-container.active {
    display: block;
}

.toc-header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--border);
}

.toc-header h2 {
    font-family: 'Ma Shan Zheng', cursive;
    font-size: 2rem;
    color: var(--accent);
    letter-spacing: 0.5em;
}

.toc-books {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.toc-book {
    background: linear-gradient(to bottom, #fffdf7, var(--bg-paper));
    border: 1px solid var(--border);
    padding: 20px;
}

.book-name {
    font-family: 'Ma Shan Zheng', cursive;
    font-size: 1.5rem;
    color: var(--accent);
    text-align: center;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px dashed var(--border);
}

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

.toc-item {
    padding: 10px 15px;
    cursor: pointer;
    border-bottom: 1px dotted var(--border);
    transition: all 0.3s ease;
    display: flex;
    gap: 10px;
}

.toc-item:hover {
    background: rgba(139, 0, 0, 0.05);
    padding-left: 25px;
}

.toc-item:last-child {
    border-bottom: none;
}

.chapter-num {
    color: var(--accent);
    font-weight: 600;
    white-space: nowrap;
    flex-shrink: 0;
}

.chapter-title {
    color: var(--text-primary);
}

.content-container {
    display: none;
    background: var(--bg-paper);
    border: 2px solid var(--border);
    box-shadow: 0 4px 20px var(--shadow);
}

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

.reading-controls {
    display: flex;
    justify-content: center;
    gap: 20px;
    padding: 20px;
    background: linear-gradient(to bottom, #f8f4eb, var(--bg-paper));
    border-bottom: 1px solid var(--border);
}

.reading-controls.bottom-controls {
    border-bottom: none;
    border-top: 1px solid var(--border);
    background: linear-gradient(to top, #f8f4eb, var(--bg-paper));
}

.nav-btn {
    font-family: 'Noto Serif TC', serif;
    font-size: 0.95rem;
    padding: 10px 25px;
    background: linear-gradient(to bottom, #fffdf7, #f5f0e6);
    border: 1px solid var(--border);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.nav-btn:hover:not(:disabled) {
    background: linear-gradient(to bottom, var(--bg-paper), #e8e0d0);
    border-color: var(--border-dark);
}

.nav-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.nav-btn.toc-btn {
    background: linear-gradient(to bottom, var(--accent), var(--accent-light));
    color: #fff;
    border-color: var(--accent);
}

.nav-btn.toc-btn:hover {
    background: linear-gradient(to bottom, var(--accent-light), var(--accent));
}

.chapter-content {
    padding: 40px 60px;
    min-height: 60vh;
}

.welcome-page {
    text-align: center;
    padding: 60px 20px;
}

.welcome-seal {
    font-family: 'Ma Shan Zheng', cursive;
    font-size: 3rem;
    color: var(--accent);
    display: inline-block;
    padding: 20px 30px;
    border: 3px solid var(--accent);
    transform: rotate(-5deg);
    margin-bottom: 30px;
}

.welcome-page h2 {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.welcome-page p {
    max-width: 600px;
    margin: 0 auto 15px;
    text-align: justify;
}

.welcome-hint {
    color: var(--accent);
    font-style: italic;
    margin-top: 30px !important;
}

.chapter-header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 2px solid var(--border);
}

.chapter-title-display {
    font-family: 'Ma Shan Zheng', cursive;
    font-size: 2rem;
    color: var(--accent);
    letter-spacing: 0.1em;
    line-height: 1.5;
}

.chapter-body {
    text-align: justify;
}

.chapter-body p {
    text-indent: 2em;
    margin-bottom: 1em;
    line-height: 2;
}

.chapter-body p.verse {
    text-indent: 0;
    text-align: center;
    color: var(--text-secondary);
    font-style: italic;
    margin: 1.5em 0;
    padding: 10px;
    background: rgba(196, 165, 116, 0.1);
    border-left: 3px solid var(--gold);
    border-right: 3px solid var(--gold);
}

@media (max-width: 768px) {
    .book-container {
        padding: 10px;
    }
    
    .book-header {
        padding: 30px 15px;
    }
    
    .book-title {
        font-size: 2.5rem;
        letter-spacing: 0.1em;
    }
    
    .book-subtitle {
        font-size: 1rem;
        letter-spacing: 0.2em;
    }
    
    .toc-container {
        padding: 15px;
    }
    
    .toc-books {
        grid-template-columns: 1fr;
    }
    
    .chapter-content {
        padding: 20px;
    }
    
    .reading-controls {
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .nav-btn {
        padding: 8px 15px;
        font-size: 0.85rem;
    }
    
    .chapter-title-display {
        font-size: 1.5rem;
    }
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #1a1510;
        --bg-paper: #2a2218;
        --text-primary: #e8dcc8;
        --text-secondary: #b8a890;
        --border: #5c4a35;
        --border-dark: #4a3a28;
        --shadow: rgba(0, 0, 0, 0.3);
    }
    
    .book-header {
        background: linear-gradient(135deg, var(--bg-paper) 0%, #1f1915 100%);
    }
    
    .toc-book {
        background: linear-gradient(to bottom, #2d2520, var(--bg-paper));
    }
    
    .nav-btn {
        background: linear-gradient(to bottom, #2d2520, #1f1915);
        color: var(--text-primary);
    }
    
    .nav-btn:hover:not(:disabled) {
        background: linear-gradient(to bottom, var(--bg-paper), #1f1915);
    }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.chapter-content {
    animation: fadeIn 0.3s ease;
}

::selection {
    background: var(--accent);
    color: #fff;
}

::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 6px;
    border: 2px solid var(--bg-primary);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-dark);
}