/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* CSS变量定义 - 移动优先 */
:root {
    /* 明亮主题 */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --text-primary: #2c3e50;
    --text-secondary: #6c757d;
    --border-color: #e9ecef;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --accent-color: #3498db;
    --hover-color: #f1f3f4;
    
    /* 移动端优化字体设置 */
    --font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    --font-size: 16px;
    --line-height: 1.6;
    --letter-spacing: 0.3px;
    
    /* 移动端间距 */
    --content-padding: 16px;
    --section-spacing: 20px;
}

/* 暗黑主题 */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --text-primary: #e8e8e8;
    --text-secondary: #b0b0b0;
    --border-color: #404040;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    --accent-color: #5dade2;
    --hover-color: #3a3a3a;
}

/* 护眼主题 */
[data-theme="sepia"] {
    --bg-primary: #f4f1e8;
    --bg-secondary: #ede6d3;
    --text-primary: #5d4e37;
    --text-secondary: #8b7355;
    --border-color: #d4c4a8;
    --shadow: 0 2px 10px rgba(93, 78, 55, 0.1);
    --accent-color: #8b4513;
    --hover-color: #e8dcc0;
}

/* 移动端字体大小变量 */
[data-font-size="small"] {
    --font-size: 14px;
}

[data-font-size="medium"] {
    --font-size: 16px;
}

[data-font-size="large"] {
    --font-size: 18px;
}

[data-font-size="xlarge"] {
    --font-size: 20px;
}

/* 行间距变量 */
[data-line-height="tight"] {
    --line-height: 1.5;
}

[data-line-height="normal"] {
    --line-height: 1.8;
}

[data-line-height="loose"] {
    --line-height: 2.2;
}

/* 字体类型变量 */
[data-font-family="serif"] {
    --font-family: 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', 'SimSun', 'Times New Roman', serif;
}

[data-font-family="sans"] {
    --font-family: 'Noto Sans SC', 'Source Han Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
}

[data-font-family="mono"] {
    --font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', 'Source Code Pro', 'Consolas', 'Courier New', monospace;
}

[data-font-family="system"] {
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
}

/* 基础样式 */
body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: all 0.3s ease;
    overflow-x: hidden;
}

.reader-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 底部导航栏样式 */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: 0.5rem;
    display: flex;
    justify-content: space-around;
    align-items: center;
    z-index: 100;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
}

.toolbar-left {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
    min-width: 0;
}

.book-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.3px;
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin: 0;
}

.toolbar-right {
    display: flex;
    gap: 4px;
    flex-shrink: 0;
    align-items: center;
}

/* 导航按钮样式 */
.nav-btn {
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 8px 4px;
    border-radius: 12px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 12px;
    min-height: 50px;
    min-width: 60px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    -webkit-tap-highlight-color: transparent;
    position: relative;
    overflow: hidden;
    flex: 1;
}

.nav-btn:hover,
.nav-btn:active {
    background-color: var(--hover-color);
    color: var(--accent-color);
    transform: translateY(-2px);
}

.nav-btn i {
    font-size: 18px;
    transition: transform 0.2s ease;
    margin-bottom: 4px;
}

.nav-btn:active {
    transform: translateY(0);
}

.nav-btn:active i {
    transform: scale(0.9);
}

.nav-btn span {
    font-size: 10px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* 保留原有按钮样式用于其他地方 */
.btn {
    background: transparent;
    border: none;
    padding: 10px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    color: var(--text-primary);
    font-size: 16px;
    min-height: 40px;
    min-width: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    -webkit-tap-highlight-color: transparent;
    position: relative;
    overflow: hidden;
}

.btn:hover,
.btn:active {
    background-color: var(--hover-color);
    color: var(--accent-color);
    transform: scale(0.95);
}

.btn i {
    font-size: 18px;
    transition: transform 0.2s ease;
}

.btn:active i {
    transform: scale(0.9);
}

/* App风格的按钮点击效果 */
.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: var(--accent-color);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.3s ease, height 0.3s ease;
    opacity: 0.1;
    z-index: -1;
}

.btn:active::before {
    width: 100%;
    height: 100%;
}

/* 阅读进度条 */
.reading-progress {
    height: 3px;
    background-color: var(--border-color);
    position: sticky;
    top: 0;
    z-index: 99;
}

.progress-bar {
    height: 100%;
    background-color: var(--accent-color);
    width: 0%;
    transition: width 0.1s ease;
}

/* 移动端优化内容区域 */
.content-area {
    flex: 1;
    max-width: 100%;
    margin: 0;
    padding: var(--content-padding);
    padding-bottom: 80px; /* 为底部导航栏留出空间 */
    width: 100%;
}

.novel-content {
    background-color: var(--bg-primary);
    padding: var(--section-spacing) var(--content-padding);
    border-radius: 0;
    box-shadow: none;
    line-height: var(--line-height);
    font-size: var(--font-size);
    letter-spacing: var(--letter-spacing);
    margin-bottom: 60px;
}

/* 移动端小说内容样式 */
.novel-content h1 {
    font-size: 1.4rem;
    margin-bottom: var(--section-spacing);
    color: var(--text-primary);
    text-align: center;
    font-weight: 600;
    letter-spacing: 1px;
    line-height: 1.4;
}

.novel-content h2 {
    font-size: 1.2rem;
    margin: var(--section-spacing) 0 16px 0;
    color: var(--text-primary);
    font-weight: 500;
    letter-spacing: 0.5px;
    line-height: 1.4;
}

.novel-content h3 {
    font-size: 1.1rem;
    margin: 18px 0 12px 0;
    color: var(--text-primary);
    font-weight: 500;
    line-height: 1.4;
}

.novel-content p {
    margin-bottom: 16px;
    text-indent: 2em;
    color: var(--text-primary);
    text-align: justify;
    word-break: break-word;
    hyphens: auto;
}

.novel-content hr {
    border: none;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--border-color), transparent);
    margin: var(--section-spacing) 0;
}

.novel-content blockquote {
    border-left: 3px solid var(--accent-color);
    padding-left: 12px;
    margin: var(--content-padding) 0;
    font-style: italic;
    color: var(--text-secondary);
    background-color: var(--bg-secondary);
    padding: 12px;
    border-radius: 4px;
}

/* 加载动画 */
.loading {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 目录抽屉样式 */
.toc-drawer {
    position: fixed;
    top: 0;
    left: -100%;
    width: 100%;
    max-width: 300px;
    height: 100vh;
    background-color: var(--bg-primary);
    border-right: 1px solid var(--border-color);
    transition: left 0.3s ease;
    z-index: 300;
    box-shadow: 2px 0 20px rgba(0, 0, 0, 0.15);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.toc-drawer.open {
    left: 0;
}

.toc-header {
    padding: var(--content-padding);
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 60px;
    flex-shrink: 0;
}

.toc-header h3 {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 500;
}

.btn-close {
    background: transparent;
    border: none;
    padding: 8px;
    border-radius: 10px;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 16px;
    min-height: 36px;
    min-width: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    -webkit-tap-highlight-color: transparent;
    position: relative;
    overflow: hidden;
}

.btn-close:hover,
.btn-close:active {
    background-color: var(--hover-color);
    color: var(--text-primary);
    transform: scale(0.95);
}

.btn-close i {
    transition: transform 0.2s ease;
}

.btn-close:active i {
    transform: scale(0.9);
}

.toc-content {
    flex: 1;
    padding: var(--content-padding);
    overflow-y: auto;
}

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

.toc-item {
    margin-bottom: 8px;
}

.toc-link {
    display: block;
    padding: 12px 16px;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s ease;
    font-size: 14px;
    line-height: 1.4;
    border: 1px solid transparent;
    -webkit-tap-highlight-color: transparent;
}

.toc-link:hover,
.toc-link:active {
    background-color: var(--hover-color);
    border-color: var(--accent-color);
    color: var(--accent-color);
    transform: translateX(4px);
}

.toc-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 250;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.toc-overlay.show {
    opacity: 1;
    visibility: visible;
}

/* 移动端设置面板 */
.settings-panel {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    max-width: 320px;
    height: 100vh;
    background-color: var(--bg-primary);
    border-left: 1px solid var(--border-color);
    padding: var(--content-padding);
    transition: right 0.3s ease;
    z-index: 200;
    box-shadow: -2px 0 20px rgba(0, 0, 0, 0.15);
    overflow-y: auto;
}

.settings-panel.open {
    right: 0;
}

.settings-content {
    padding: 2rem;
}

.settings-content h3 {
    margin-bottom: var(--section-spacing);
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 500;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.setting-group {
    margin-bottom: var(--section-spacing);
}

.setting-group label {
    display: block;
    margin-bottom: 12px;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 14px;
}

.font-size-controls,
.line-height-controls,
.theme-controls,
.font-family-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.btn-small {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 12px 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-primary);
    font-size: 14px;
    text-align: center;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    -webkit-tap-highlight-color: transparent;
}

.btn-small:hover,
.btn-small.active {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    transform: scale(0.98);
}

.btn-small:active {
    transform: scale(0.98);
}

.close-settings {
    width: 100%;
    margin-top: 2rem;
    padding: 1rem;
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
}

.close-settings:hover {
    opacity: 0.9;
}

/* 大屏幕适配 */
@media (min-width: 768px) {
    .toc-drawer {
        max-width: 320px;
        left: -320px;
    }
    
    .toc-header {
        padding: 1.5rem;
    }
    
    .toc-content {
        padding: 1.5rem;
    }
    
    .toc-link {
        padding: 14px 18px;
        font-size: 15px;
    }
    :root {
        --content-padding: 24px;
        --section-spacing: 24px;
        --font-size: 18px;
    }
    
    .content-area {
        max-width: 800px;
        margin: 0 auto;
        padding: 2rem;
    }
    
    .novel-content {
        padding: 2rem;
        border-radius: 8px;
        box-shadow: var(--shadow);
    }
    
    .toolbar {
        padding: 1rem 2rem;
    }
    
    .book-title {
        font-size: 1.5rem;
    }
    
    .settings-panel {
        width: 350px;
        right: -350px;
    }
    
    .font-size-buttons {
        display: flex;
        gap: 8px;
        flex-wrap: wrap;
    }
}

/* 打印样式 */
@media print {
    .toolbar,
    .reading-progress,
    .settings-panel {
        display: none;
    }
    
    .content-area {
        max-width: none;
        padding: 0;
    }
    
    .novel-content {
        box-shadow: none;
        padding: 0;
    }
}