/**
 * 书籍在线阅读系统 - 专属样式
 * 旧书馆·OldeBook Reading System
 * 
 * @author 旧书馆·OldeBook
 * @date 2026-04-08
 */

/* ==================== 变量定义 ==================== */
:root {
    /* 阅读主题色 - 棕色古籍风 */
    --reading-primary: #8b5a2b;
    --reading-primary-light: #a67c52;
    --reading-primary-dark: #5c3d1e;
    
    /* 背景色 */
    --reading-bg-white: #ffffff;
    --reading-bg-sepia: #f4ecd8;
    --reading-bg-dark: #1a1a2e;
    
    /* 文字色 */
    --reading-text-white: #333333;
    --reading-text-sepia: #5c4b37;
    --reading-text-dark: #e0e0e0;
    
    /* 当前配色 */
    --reading-bg: var(--reading-bg-white);
    --reading-text: var(--reading-text-white);
    
    /* 字体大小 */
    --reading-font-small: 14px;
    --reading-font-medium: 16px;
    --reading-font-large: 18px;
    --reading-font: var(--reading-font-medium);
    
    /* 间距 */
    --reading-padding: 20px;
    --reading-content-max: 800px;
}

/* ==================== 基础布局 ==================== */
.reading-page {
    background: var(--reading-bg);
    color: var(--reading-text);
    min-height: 100vh;
    transition: background-color 0.3s, color 0.3s;
}

/* ==================== 顶部导航 ==================== */
.reading-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 56px;
    background: var(--reading-primary);
    color: #fff;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.reading-nav {
    max-width: 1200px;
    height: 100%;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.reading-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #fff;
    text-decoration: none;
    font-weight: bold;
}

.reading-logo .logo-icon {
    font-size: 24px;
}

.reading-logo .logo-text {
    font-size: 18px;
}

.reading-book-title {
    flex: 1;
    text-align: center;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    padding: 0 20px;
}

.reading-book-title a {
    color: #fff;
    text-decoration: none;
    font-size: 16px;
}

.reading-book-title a:hover {
    text-decoration: underline;
}

.reading-actions {
    display: flex;
    gap: 12px;
}

.reading-actions .btn-toc,
.reading-actions .btn-bookmark {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 6px 12px;
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 4px;
    color: #fff;
    text-decoration: none;
    font-size: 14px;
    cursor: pointer;
    transition: background 0.2s;
}

.reading-actions .btn-toc:hover,
.reading-actions .btn-bookmark:hover {
    background: rgba(255, 255, 255, 0.3);
}

.reading-actions .btn-bookmark.active {
    background: rgba(255, 255, 255, 0.4);
}

/* ==================== 主内容区 ==================== */
.reading-main {
    padding-top: 56px;
    min-height: calc(100vh - 56px);
}

.reading-container {
    max-width: var(--reading-content-max);
    margin: 0 auto;
    padding: var(--reading-padding);
}

/* ==================== 目录页样式 ==================== */
.reading-toc {
    padding-top: 40px;
}

/* 书籍信息卡片 */
.book-info-card {
    display: flex;
    gap: 30px;
    padding: 30px;
    background: var(--reading-bg);
    border: 1px solid var(--reading-primary-light);
    border-radius: 12px;
    margin-bottom: 30px;
    box-shadow: 0 4px 12px rgba(139, 90, 43, 0.1);
}

.book-cover {
    width: 160px;
    height: 220px;
    flex-shrink: 0;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.book-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.book-cover-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--reading-primary) 0%, var(--reading-primary-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
}

.cover-title {
    writing-mode: vertical-rl;
    font-size: 28px;
    font-weight: bold;
    letter-spacing: 4px;
}

.book-meta {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.book-title {
    font-size: 24px;
    font-weight: bold;
    color: var(--reading-primary);
    margin: 0;
}

.book-author {
    font-size: 14px;
    color: #666;
    margin: 0;
}

.book-author .label {
    color: #999;
    margin-right: 4px;
}

.book-intro {
    font-size: 14px;
    line-height: 1.8;
    color: #555;
    margin: 8px 0;
}

.book-stats {
    display: flex;
    gap: 20px;
    font-size: 13px;
    color: #888;
}

.book-stats .stat {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* 阅读进度条 */
.reading-progress-bar {
    margin: 12px 0;
}

.progress-label {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    color: #888;
    margin-bottom: 6px;
}

.progress-track {
    height: 6px;
    background: #e0e0e0;
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--reading-primary) 0%, var(--reading-primary-light) 100%);
    border-radius: 3px;
    transition: width 0.3s;
}

/* 开始阅读按钮 */
.btn-read-start {
    display: inline-block;
    padding: 12px 32px;
    background: linear-gradient(135deg, var(--reading-primary) 0%, var(--reading-primary-dark) 100%);
    color: #fff !important;
    text-decoration: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: bold;
    text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
    margin-top: auto;
}

.btn-read-start:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(139, 90, 43, 0.3);
}

/* 章节列表 */
.chapter-list {
    background: var(--reading-bg);
    border: 1px solid #e8e8e8;
    border-radius: 12px;
    overflow: hidden;
}

.chapter-list-title {
    padding: 16px 20px;
    margin: 0;
    font-size: 18px;
    font-weight: bold;
    color: var(--reading-primary);
    background: linear-gradient(to right, rgba(139, 90, 43, 0.05), transparent);
    border-bottom: 1px solid #e8e8e8;
}

.chapter-list-content {
    padding: 10px;
}

.chapter-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
    color: var(--reading-text);
    text-decoration: none;
    border-radius: 8px;
    transition: background 0.2s;
}

.chapter-item:hover {
    background: rgba(139, 90, 43, 0.08);
}

.chapter-item.chapter-special {
    color: #888;
    font-size: 14px;
}

.chapter-item .chapter-title {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.chapter-reading {
    font-size: 12px;
    color: var(--reading-primary);
    background: rgba(139, 90, 43, 0.1);
    padding: 2px 8px;
    border-radius: 4px;
}

/* ==================== 阅读页样式 ==================== */
.reading-content {
    padding-top: 40px;
    padding-bottom: 100px;
}

/* 章节标题 */
.chapter-heading {
    font-size: 22px;
    font-weight: bold;
    color: var(--reading-primary);
    text-align: center;
    padding: 20px 0 30px;
    margin: 0;
    border-bottom: 2px solid var(--reading-primary-light);
    margin-bottom: 30px;
}

/* 正文内容 */
.chapter-body {
    font-size: var(--reading-font);
    line-height: 1.9;
    text-indent: 2em;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.chapter-body p {
    margin: 1em 0;
}

/* 章节导航 */
.chapter-nav {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid #e0e0e0;
}

.nav-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 20px;
    background: var(--reading-bg);
    border: 1px solid var(--reading-primary-light);
    border-radius: 8px;
    color: var(--reading-primary);
    text-decoration: none;
    font-size: 15px;
    transition: all 0.2s;
}

.nav-btn:hover {
    background: var(--reading-primary);
    color: #fff;
}

.nav-btn.disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.nav-btn.nav-toc {
    flex: 0 0 auto;
    padding: 14px 24px;
}

/* ==================== 设置面板 ==================== */
.reading-settings {
    position: fixed;
    bottom: 70px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--reading-bg);
    border: 1px solid #ddd;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    display: none;
    z-index: 90;
}

.reading-settings.show {
    display: block;
}

.settings-item {
    margin-bottom: 16px;
}

.settings-item:last-child {
    margin-bottom: 0;
}

.settings-label {
    display: block;
    font-size: 13px;
    color: #888;
    margin-bottom: 10px;
}

.font-size-btns,
.bg-color-btns {
    display: flex;
    gap: 8px;
}

.font-btn,
.bg-btn {
    width: 40px;
    height: 36px;
    border: 1px solid #ddd;
    border-radius: 6px;
    background: #fff;
    color: #333;
    cursor: pointer;
    transition: all 0.2s;
}

.font-btn:hover,
.bg-btn:hover {
    border-color: var(--reading-primary);
}

.font-btn.active,
.bg-btn.active {
    background: var(--reading-primary);
    border-color: var(--reading-primary);
    color: #fff;
}

/* ==================== 底部工具栏 ==================== */
.reading-toolbar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 56px;
    background: var(--reading-bg);
    border-top: 1px solid #e0e0e0;
    z-index: 100;
}

.toolbar-inner {
    max-width: 600px;
    height: 100%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
}

.toolbar-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 8px 16px;
    background: none;
    border: none;
    color: var(--reading-text);
    cursor: pointer;
    border-radius: 8px;
    transition: background 0.2s;
}

.toolbar-btn:hover {
    background: rgba(139, 90, 43, 0.1);
}

.toolbar-btn .icon {
    font-size: 18px;
}

.toolbar-btn .text {
    font-size: 11px;
    color: #888;
}

.toolbar-progress {
    font-size: 14px;
    color: var(--reading-primary);
    font-weight: bold;
}

/* ==================== 响应式布局 ==================== */
@media (max-width: 768px) {
    :root {
        --reading-padding: 16px;
    }
    
    .reading-nav {
        padding: 0 16px;
    }
    
    .reading-book-title {
        display: none;
    }
    
    .book-info-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
        padding: 24px;
    }
    
    .book-cover {
        width: 140px;
        height: 190px;
    }
    
    .book-title {
        font-size: 20px;
    }
    
    .chapter-nav {
        flex-wrap: wrap;
    }
    
    .nav-btn {
        flex: 1 1 45%;
    }
    
    .nav-btn.nav-toc {
        flex: 1 1 100%;
        order: -1;
    }
}

/* ==================== 深色/米黄模式额外样式 ==================== */
body.reading-bg-sepia,
body.reading-bg-dark {
    --reading-bg: var(--reading-bg-sepia);
    --reading-text: var(--reading-text-sepia);
}

body.reading-bg-dark {
    --reading-bg: var(--reading-bg-dark);
    --reading-text: var(--reading-text-dark);
}

body.reading-bg-dark .book-info-card,
body.reading-bg-dark .chapter-list {
    background: #252540;
    border-color: #3a3a5c;
}

body.reading-bg-dark .chapter-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

body.reading-bg-dark .nav-btn {
    border-color: #3a3a5c;
}

body.reading-bg-dark .nav-btn:hover {
    background: #3a3a5c;
}

body.reading-bg-dark .toolbar-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* ==================== 打印样式 ==================== */
@media print {
    .reading-header,
    .reading-toolbar,
    .reading-settings,
    .chapter-nav {
        display: none !important;
    }
    
    .reading-main {
        padding-top: 0;
    }
    
    .chapter-body {
        font-size: 12pt;
        line-height: 1.6;
    }
}