/* ========================================
   墨笈 · 优雅Markdown阅读器 - 样式表
   ======================================== */

/* CSS Variables - Theme System */
:root {
    /* Light Theme */
    --color-primary: #2C3E50;
    --color-secondary: #34495E;
    --color-accent: #E74C3C;
    --color-bg: #FAFAF8;
    --color-bg-secondary: #F5F5F3;
    --color-text: #333333;
    --color-text-secondary: #666666;
    --color-text-muted: #999999;
    --color-border: #E8E8E6;
    --color-code-bg: #F6F8FA;
    --color-code-border: #E1E4E8;
    --color-link: #3498DB;
    --color-link-hover: #2980B9;
    --color-blockquote: #6B7280;
    --color-blockquote-bg: #F9FAFB;
    --color-blockquote-border: #D1D5DB;
    --color-table-header: #F3F4F6;
    --color-table-border: #E5E7EB;
    --color-hr: #E5E7EB;
    --color-shadow: rgba(0, 0, 0, 0.08);
    --color-shadow-hover: rgba(0, 0, 0, 0.12);
    --color-overlay: rgba(0, 0, 0, 0.5);
    
    /* Typography */
    --font-serif: "Noto Serif SC", "Source Han Serif CN", Georgia, serif;
    --font-sans: "Noto Sans SC", "Source Han Sans CN", -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: "JetBrains Mono", "Fira Code", "Source Code Pro", monospace;
    
    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    
    /* Layout */
    --content-max-width: 720px;
    --header-height: 64px;
    --status-bar-height: 48px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;
    
    /* Sidebar */
    --sidebar-width: 320px;
    
    /* Background Settings */
    --bg-page: #FAFAF8;
    --bg-content: #FAFAF8;
    --bg-pattern: none;
    --bg-pattern-opacity: 1;
}

/* Dark Theme */
[data-theme="dark"] {
    --color-primary: #ECF0F1;
    --color-secondary: #BDC3C7;
    --color-accent: #E74C3C;
    --color-bg: #1A1A2E;
    --color-bg-secondary: #16213E;
    --color-text: #E8E8E6;
    --color-text-secondary: #BDC3C7;
    --color-text-muted: #7F8C8D;
    --color-border: #2C2C54;
    --color-code-bg: #0D0D1A;
    --color-code-border: #2C2C54;
    --color-link: #5DADE2;
    --color-link-hover: #85C1E9;
    --color-blockquote: #9CA3AF;
    --color-blockquote-bg: #1F2937;
    --color-blockquote-border: #374151;
    --color-table-header: #1F2937;
    --color-table-border: #374151;
    --color-hr: #374151;
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-shadow-hover: rgba(0, 0, 0, 0.4);
    --color-overlay: rgba(0, 0, 0, 0.7);
    
    /* Background Settings */
    --bg-page: #1A1A2E;
    --bg-content: #1A1A2E;
}

/* ========================================
   Reset & Base Styles
   ======================================== */

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

html {
    font-size: 18px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-page);
    color: var(--color-text);
    line-height: 1.8;
    min-height: 100vh;
    transition: background-color var(--transition-normal), color var(--transition-normal);
    position: relative;
}

/* 图案背景层 - 使用伪元素实现透明度控制 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--bg-page);
    background-image: var(--bg-pattern);
    opacity: var(--bg-pattern-opacity, 1);
    pointer-events: none;
    z-index: -1;
    transition: background-color var(--transition-normal), background-image var(--transition-normal), opacity var(--transition-normal);
}

/* Selection */
::selection {
    background-color: var(--color-accent);
    color: white;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}

/* ========================================
   Progress Bar
   ======================================== */

.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: transparent;
    z-index: 1000;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-accent), #F39C12);
    width: 0%;
    transition: width 0.1s ease-out;
    box-shadow: 0 0 10px var(--color-accent);
}

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

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--color-bg);
    background-image: var(--bg-pattern);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
    box-sizing: border-box;
    transition: background-color var(--transition-normal), border-color var(--transition-normal), background-image var(--transition-normal);
}

.header-content {
    max-width: 1200px;
    height: 100%;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-sizing: border-box;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    flex: 1;
    min-width: 0;
    overflow: hidden;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-primary);
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 600;
}

.logo-icon {
    width: 24px;
    height: 24px;
}

.file-info {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.file-name {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    flex-shrink: 0;
}

.icon-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    color: var(--color-text);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.icon-btn:hover {
    background: var(--color-bg-secondary);
    color: var(--color-primary);
}

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

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

.theme-icon {
    transition: all var(--transition-normal);
}

.theme-icon.sun {
    display: block;
}

.theme-icon.moon {
    display: none;
}

[data-theme="dark"] .theme-icon.sun {
    display: none;
}

[data-theme="dark"] .theme-icon.moon {
    display: block;
}

#themeToggle:hover .theme-icon.sun {
    transform: rotate(45deg);
}

#themeToggle:hover .theme-icon.moon {
    transform: rotate(-15deg);
}

/* ========================================
   Sidebar Overlay
   ======================================== */

.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-overlay);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 200;
}

.sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ========================================
   Settings Sidebar
   ======================================== */

.settings-sidebar {
    position: fixed;
    top: 0;
    right: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--color-bg);
    border-left: 1px solid var(--color-border);
    transform: translateX(100%);
    transition: transform var(--transition-normal);
    z-index: 201;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

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

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
}

.sidebar-title {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-primary);
}

.sidebar-close {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.sidebar-close:hover {
    background: var(--color-bg-secondary);
    color: var(--color-primary);
}

.sidebar-close svg {
    width: 18px;
    height: 18px;
}

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

/* Setting Groups */
.setting-group {
    margin-bottom: var(--space-xl);
}

.setting-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

.setting-icon {
    width: 16px;
    height: 16px;
    color: var(--color-text-secondary);
}

.setting-control {
    display: flex;
    align-items: center;
    width: 100%;
}

/* 字号控制：中间值居中 */
.setting-control:has(.size-btn) .setting-value {
    flex: 1;
    text-align: center;
}

.setting-value {
    font-size: 0.875rem;
    font-family: var(--font-mono);
    color: var(--color-text-secondary);
    min-width: 50px;
    text-align: center;
    flex-shrink: 0;
}

/* Setting Row - 两列布局 */
.setting-row {
    display: flex;
    gap: var(--space-lg);
    align-items: flex-end;
}

.setting-item {
    flex: 1;
    min-width: 0;
}

.setting-item .setting-label {
    margin-bottom: var(--space-xs);
}

.setting-item .setting-select {
    width: 100%;
}

.setting-select-small {
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.8rem;
}

.setting-control-compact {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.setting-control-compact .size-btn {
    width: 28px;
    height: 28px;
}

.setting-control-compact .setting-value {
    min-width: 42px;
    font-size: 0.8rem;
}

/* Theme Toggle Button */
.theme-btn {
    flex: 1;
    height: 40px;
    padding: 0 var(--space-lg);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
}

.theme-btn:hover {
    background: var(--color-primary);
    color: var(--color-bg);
    border-color: var(--color-primary);
}

/* Theme label text - 使用 !important 确保优先级 */
.theme-label-light {
    display: inline !important;
}

.theme-label-dark {
    display: none !important;
}

/* Dark mode theme labels */
[data-theme="dark"] .theme-label-light {
    display: none !important;
}

[data-theme="dark"] .theme-label-dark {
    display: inline !important;
}

/* Theme icons in label - 使用 !important 确保优先级 */
.theme-icon-sun,
.setting-label .theme-icon-sun {
    display: inline-block !important;
    width: 16px;
    height: 16px;
}

.theme-icon-moon,
.setting-label .theme-icon-moon {
    display: none !important;
    width: 16px;
    height: 16px;
}

/* Dark mode theme icons */
[data-theme="dark"] .theme-icon-sun,
[data-theme="dark"] .setting-label .theme-icon-sun {
    display: none !important;
}

[data-theme="dark"] .theme-icon-moon,
[data-theme="dark"] .setting-label .theme-icon-moon {
    display: inline-block !important;
}

/* Range Slider */
input[type="range"] {
    flex: 10;
    height: 4px;
    background: var(--color-border);
    border-radius: var(--radius-full);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

/* Range slider container with gap */
.setting-control:has(input[type="range"]) {
    gap: var(--space-md);
}

/* Range slider value - fixed width on the right */
input[type="range"] + .setting-value {
    min-width: 55px;
    text-align: right;
    flex-shrink: 0;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--color-primary);
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 2px 8px var(--color-shadow);
}

input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--color-primary);
    border: none;
    border-radius: 50%;
    cursor: pointer;
}

/* Select */
.setting-select {
    width: 100%;
    height: 40px;
    padding: 0 var(--space-md);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-size: 0.875rem;
    cursor: pointer;
    outline: none;
    transition: all var(--transition-fast);
}

.setting-select:hover {
    border-color: var(--color-primary);
}

.setting-select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(44, 62, 80, 0.1);
}

/* Size Buttons */
.size-btn {
    width: 60px;
    height: 40px;
    border: 1px solid var(--color-border);
    background: var(--color-bg-secondary);
    color: var(--color-text);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.size-btn:hover {
    background: var(--color-primary);
    color: var(--color-bg);
    border-color: var(--color-primary);
}

.size-btn svg {
    width: 14px;
    height: 14px;
}

/* Background Tabs */
.bg-tabs {
    display: flex;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
    background: var(--color-bg-secondary);
    padding: var(--space-xs);
    border-radius: var(--radius-md);
}

.bg-tab {
    flex: 1;
    padding: var(--space-xs) var(--space-sm);
    border: none;
    background: transparent;
    color: var(--color-text-secondary);
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.bg-tab:hover {
    color: var(--color-text);
}

.bg-tab.active {
    background: var(--color-bg);
    color: var(--color-primary);
    font-weight: 500;
    box-shadow: 0 1px 3px var(--color-shadow);
}

/* Background Panels */
.bg-panel {
    display: none;
}

.bg-panel.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Background Grid */
.bg-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-sm);
}

.bg-option {
    aspect-ratio: 1;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.bg-option:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px var(--color-shadow);
}

.bg-option.selected {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(44, 62, 80, 0.2);
}

.bg-option.selected::after {
    content: '';
    position: absolute;
    top: 4px;
    right: 4px;
    width: 12px;
    height: 12px;
    background: var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.bg-option.artistic,
.bg-option.chinese,
.bg-option.stationery {
    background-size: cover;
    background-position: center;
}

/* ========================================
   Main Content
   ======================================== */

.main {
    min-height: calc(100vh - var(--header-height) - var(--status-bar-height));
    padding-top: var(--header-height);
    padding-bottom: var(--status-bar-height);
    box-sizing: border-box;
}

/* ========================================
   Welcome Screen (Drop Zone)
   ======================================== */

.welcome-screen {
    min-height: calc(100vh - var(--header-height) - var(--status-bar-height));
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-2xl);
    box-sizing: border-box;
}

.welcome-content {
    text-align: center;
    max-width: 400px;
    padding: var(--space-3xl);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    background: var(--color-bg-secondary);
}

.welcome-content:hover {
    border-color: var(--color-primary);
    background: var(--color-bg);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px var(--color-shadow);
}

.welcome-content.drag-over {
    border-color: var(--color-link);
    background: var(--color-bg);
    transform: scale(1.02);
    box-shadow: 0 0 0 4px rgba(52, 152, 219, 0.1);
}

.welcome-icon {
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
    transition: all var(--transition-normal);
}

.welcome-content:hover .welcome-icon {
    color: var(--color-primary);
    transform: scale(1.05);
}

.welcome-title {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.welcome-desc {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
}

.welcome-formats {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
}

.format-badge {
    padding: var(--space-xs) var(--space-md);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: var(--color-text-secondary);
}

/* ========================================
   Reading Area
   ======================================== */

.reading-area {
    display: none;
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: var(--space-2xl) var(--space-lg);
    animation: fadeIn 0.5s ease-out;
    box-sizing: border-box;
}

.reading-area.active {
    display: block;
}

/* ========================================
   Markdown Content Styling
   ======================================== */

.markdown-content {
    font-size: 1rem;
    line-height: 1.9;
    background-color: var(--bg-content);
    background-image: var(--bg-pattern);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    transition: font-size var(--transition-normal), line-height var(--transition-normal), background-color var(--transition-normal), background-image var(--transition-normal);
}

.markdown-content > *:first-child {
    margin-top: 0;
}

/* Headings */
.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4,
.markdown-content h5,
.markdown-content h6 {
    font-family: var(--font-serif);
    font-weight: 600;
    color: var(--color-primary);
    margin-top: 2em;
    margin-bottom: 0.75em;
    line-height: 1.4;
}

.markdown-content h1 {
    font-size: 2rem;
    padding-bottom: 0.5em;
    border-bottom: 2px solid var(--color-border);
}

.markdown-content h2 {
    font-size: 1.5rem;
    padding-bottom: 0.3em;
    border-bottom: 1px solid var(--color-border);
}

.markdown-content h3 {
    font-size: 1.25rem;
}

.markdown-content h4 {
    font-size: 1.125rem;
}

.markdown-content h5 {
    font-size: 1rem;
}

.markdown-content h6 {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

/* Paragraph */
.markdown-content p {
    margin-bottom: 1.5em;
}

/* Links */
.markdown-content a {
    color: var(--color-link);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: all var(--transition-fast);
}

.markdown-content a:hover {
    color: var(--color-link-hover);
    border-bottom-color: var(--color-link-hover);
}

/* Strong & Em */
.markdown-content strong {
    font-weight: 700;
    color: var(--color-primary);
}

.markdown-content em {
    font-style: italic;
}

/* Lists */
.markdown-content ul,
.markdown-content ol {
    margin-bottom: 1.5em;
    padding-left: 1.5em;
}

.markdown-content li {
    margin-bottom: 0.5em;
}

.markdown-content li > ul,
.markdown-content li > ol {
    margin-top: 0.5em;
    margin-bottom: 0;
}

.markdown-content ul {
    list-style-type: disc;
}

.markdown-content ol {
    list-style-type: decimal;
}

.markdown-content ul ul {
    list-style-type: circle;
}

/* Task Lists */
.markdown-content input[type="checkbox"] {
    margin-right: 0.5em;
    accent-color: var(--color-accent);
}

/* Code - background can be overridden by inline styles */
.markdown-content code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background-color: var(--color-code-bg);
    padding: 0.2em 0.4em;
    border-radius: var(--radius-sm);
    color: var(--color-accent);
    border: 1px solid var(--color-code-border);
    transition: background-color var(--transition-normal);
}

.markdown-content pre {
    margin: 1.5em 0;
    padding: 0;
    background-color: var(--color-code-bg);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--color-code-border);
    position: relative;
    transition: background-color var(--transition-normal);
}

/* Code block header - lighter shade */
.code-block-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px 8px 16px;
    background-color: rgba(255, 255, 255, 0.08);
    border-bottom: 1px solid var(--color-code-border);
}

.code-block-lang {
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 500;
}

.code-block-actions {
    display: flex;
    gap: 8px;
}

.code-block-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border: none;
    background: transparent;
    color: var(--color-text-muted);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.code-block-btn:hover {
    background: rgba(0, 0, 0, 0.15);
    color: var(--color-text);
}

/* Code wrapper with line numbers */
.code-wrapper {
    display: flex;
    overflow-x: auto;
}

.line-numbers {
    flex-shrink: 0;
    padding: 16px;
    background-color: transparent;
    text-align: right;
    user-select: none;
}

.line-numbers span {
    display: block;
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 22px;
    color: var(--color-text-muted);
}

.code-container {
    flex: 1;
    overflow-x: auto;
    min-width: 0;
}

.markdown-content pre code {
    display: block;
    padding: 16px;
    padding-left: 20px;
    background: transparent !important;
    border: none;
    border-radius: 0;
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 22px;
    white-space: pre;
    word-wrap: normal;
    min-width: min-content;
}

/* Prism token styling - inline tokens should stay inline */
.markdown-content pre code span.token {
    line-height: 22px;
}

/* Blockquote - background can be overridden by inline styles */
.markdown-content blockquote {
    margin: 1.5em 0;
    padding: var(--space-md) var(--space-lg);
    background-color: var(--color-blockquote-bg);
    border-left: 4px solid var(--color-blockquote-border);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    color: var(--color-blockquote);
    font-style: italic;
    transition: background-color var(--transition-normal);
}

.markdown-content blockquote p:last-child {
    margin-bottom: 0;
}

/* Horizontal Rule */
.markdown-content hr {
    margin: 2em 0;
    border: none;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-hr), transparent);
}

/* Images */
.markdown-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: 1.5em 0;
    box-shadow: 0 4px 20px var(--color-shadow);
}

/* Tables - 增强样式，确保背景图案应用 */
.markdown-content table {
    width: 100%;
    margin: 1.5em 0;
    border-collapse: collapse;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--color-table-border);
    background-color: inherit;
    transition: background-color var(--transition-normal);
}

.markdown-content thead {
    background-color: var(--color-table-header);
    background-image: var(--bg-pattern);
    transition: background-color var(--transition-normal);
}

.markdown-content th,
.markdown-content td {
    padding: var(--space-sm) var(--space-md);
    text-align: left;
    border-bottom: 1px solid var(--color-table-border);
    background-color: inherit;
    transition: background-color var(--transition-normal);
}

.markdown-content th {
    font-weight: 600;
    color: var(--color-primary);
}

.markdown-content tr:last-child td {
    border-bottom: none;
}

.markdown-content tbody tr:hover {
    background: var(--color-bg-secondary);
}

/* Table wrapper for horizontal scrolling */
.markdown-content .table-wrapper {
    display: block;
    width: 100%;
    max-width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    border-radius: var(--radius-md);
    margin: 1.5em 0;
    /* Custom scrollbar for webkit browsers */
    scrollbar-width: thin;
    scrollbar-color: var(--color-text-muted) var(--color-bg-secondary);
}

/* Webkit scrollbar styling */
.markdown-content .table-wrapper::-webkit-scrollbar {
    height: 6px;
}

.markdown-content .table-wrapper::-webkit-scrollbar-track {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-sm);
}

.markdown-content .table-wrapper::-webkit-scrollbar-thumb {
    background: var(--color-text-muted);
    border-radius: var(--radius-sm);
}

.markdown-content .table-wrapper::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-secondary);
}

/* Ensure tables inside wrapper are min-width to show all content */
.markdown-content .table-wrapper table {
    min-width: 100%;
    width: auto;
    margin: 0;
}

/* ========================================
   Status Bar
   ======================================== */

.status-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--status-bar-height);
    background: var(--color-bg);
    background-image: var(--bg-pattern);
    border-top: 1px solid var(--color-border);
    z-index: 100;
    box-sizing: border-box;
    transition: background-color var(--transition-normal), border-color var(--transition-normal), background-image var(--transition-normal);
}

.status-content {
    max-width: 1200px;
    height: 100%;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xl);
    box-sizing: border-box;
}

.status-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.status-icon {
    width: 16px;
    height: 16px;
}

/* ========================================
   Export Dropdown
   ======================================== */
.export-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 20px var(--color-shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
    z-index: 300;
    min-width: 180px;
}

.export-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.export-option {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    border: none;
    background: transparent;
    color: var(--color-text);
    font-size: 0.875rem;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.export-option:first-child {
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.export-option:last-child {
    border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.export-option:hover {
    background: var(--color-bg-secondary);
}

.export-option svg {
    width: 16px;
    height: 16px;
    color: var(--color-text-secondary);
}

/* ========================================
   Export Confirmation Modal
   ======================================== */
.export-confirm-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-overlay);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 500;
}

.export-confirm-modal.active {
    display: flex;
}

.export-confirm-content {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
    max-width: 400px;
    box-shadow: 0 8px 40px var(--color-shadow);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.export-confirm-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-lg);
    background: linear-gradient(135deg, var(--color-accent), #F39C12);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.export-confirm-icon svg {
    width: 32px;
    height: 32px;
    color: white;
}

.export-confirm-title {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.export-confirm-desc {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    line-height: 1.5;
}

.export-confirm-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
}

.export-confirm-btn {
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
}

.export-confirm-btn.cancel {
    background: var(--color-bg-secondary);
    color: var(--color-text-secondary);
}

.export-confirm-btn.cancel:hover {
    background: var(--color-border);
    color: var(--color-text);
}

.export-confirm-btn.confirm {
    background: linear-gradient(135deg, var(--color-accent), #F39C12);
    color: white;
}

.export-confirm-btn.confirm:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(231, 76, 60, 0.3);
}

/* ========================================
   Export Modal
   ======================================== */
.export-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-overlay);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 500;
}

.export-modal.active {
    display: flex;
}

.export-modal-content {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    min-width: 320px;
    max-width: 480px;
    box-shadow: 0 8px 40px var(--color-shadow);
}

.export-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
}

.export-modal-header h3 {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-primary);
}

.export-modal-close {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.export-modal-close:hover {
    background: var(--color-bg-secondary);
    color: var(--color-primary);
}

.export-modal-close svg {
    width: 18px;
    height: 18px;
}

.export-progress {
    width: 100%;
}

.export-progress-bar {
    width: 100%;
    height: 8px;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--space-sm);
}

.export-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-accent), #F39C12);
    width: 0%;
    transition: width 0.3s ease;
}

.export-progress-text {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    text-align: center;
    display: block;
}

/* ========================================
   TOC Sidebar
   ======================================== */
.toc-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-overlay);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 150;
}

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

.toc-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100vh;
    background: var(--color-bg);
    border-right: 1px solid var(--color-border);
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
    z-index: 151;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.toc-sidebar.active {
    transform: translateX(0);
}

.toc-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
}

.toc-title {
    font-family: var(--font-serif);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-primary);
}

.toc-close {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.toc-close:hover {
    background: var(--color-bg-secondary);
    color: var(--color-primary);
}

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

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

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

.toc-item {
    margin-bottom: var(--space-xs);
}

.toc-link {
    display: block;
    padding: var(--space-xs) var(--space-sm);
    color: var(--color-text);
    font-size: 0.875rem;
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    border-left: 2px solid transparent;
}

.toc-link:hover {
    background: var(--color-bg-secondary);
    color: var(--color-primary);
}

.toc-link.active {
    background: var(--color-bg-secondary);
    border-left-color: var(--color-accent);
    color: var(--color-primary);
    font-weight: 500;
}

.toc-item[data-level="1"] .toc-link {
    font-weight: 500;
    padding-left: var(--space-sm);
}

.toc-item[data-level="2"] .toc-link {
    padding-left: calc(var(--space-sm) + 12px);
    font-size: 0.8125rem;
}

.toc-item[data-level="3"] .toc-link {
    padding-left: calc(var(--space-sm) + 24px);
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

.toc-item[data-level="3"] .toc-link:hover {
    color: var(--color-primary);
}

.toc-empty {
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.875rem;
    padding: var(--space-xl);
}

/* ========================================
   Floating TOC - Left Side
   ======================================== */

.floating-toc {
    position: fixed;
    left: var(--space-lg);
    top: 50%;
    transform: translateY(-50%);
    z-index: 90;
    max-height: 70vh;
    overflow-y: auto;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
    background: transparent;
    /* Hide scrollbar for Chrome, Safari, Opera */
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.floating-toc::-webkit-scrollbar {
    display: none;
}

.floating-toc.visible {
    opacity: 1;
    pointer-events: auto;
}

/* Hide header in floating TOC - now shown directly via title bar button */
.floating-toc-header {
    display: none;
}

.floating-toc-nav {
    display: block;
    background: transparent;
    max-height: 70vh;
    overflow-y: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.floating-toc-nav::-webkit-scrollbar {
    display: none;
}

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

.floating-toc-nav .toc-item {
    margin-bottom: var(--space-xs);
}

.floating-toc-nav .toc-link {
    display: block;
    padding: var(--space-xs) var(--space-sm);
    color: var(--color-text);
    font-size: 0.875rem;
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    white-space: normal;
    word-wrap: break-word;
    max-width: 220px;
    line-height: 1.5;
}

.floating-toc-nav .toc-link:hover {
    color: var(--color-accent);
}

.floating-toc-nav .toc-link.active {
    background: linear-gradient(90deg, var(--color-accent), #F39C12);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 600;
}

.floating-toc-nav .toc-item[data-level="1"] .toc-link {
    font-weight: 500;
    color: var(--color-text-secondary);
}

.floating-toc-nav .toc-item[data-level="2"] .toc-link {
    padding-left: calc(var(--space-sm) + 12px);
    font-size: 0.8125rem;
    opacity: 0.9;
}

.floating-toc-nav .toc-item[data-level="3"] .toc-link {
    padding-left: calc(var(--space-sm) + 24px);
    font-size: 0.75rem;
    opacity: 0.8;
}

/* ========================================
   Toast Notification
   ======================================== */

.toast {
    position: fixed;
    bottom: calc(var(--status-bar-height) + var(--space-lg));
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--color-primary);
    color: var(--color-bg);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 200;
}

.toast.show {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.toast.error {
    background: var(--color-accent);
}

/* ========================================
   Prism.js Theme Overrides
   ======================================== */

[data-theme="light"] .token.comment,
[data-theme="light"] .token.prolog,
[data-theme="light"] .token.doctype,
[data-theme="light"] .token.cdata {
    color: #6B7280;
}

[data-theme="light"] .token.punctuation {
    color: #374151;
}

[data-theme="light"] .token.property,
[data-theme="light"] .token.tag,
[data-theme="light"] .token.boolean,
[data-theme="light"] .token.number,
[data-theme="light"] .token.constant,
[data-theme="light"] .token.symbol,
[data-theme="light"] .token.deleted {
    color: #059669;
}

[data-theme="light"] .token.selector,
[data-theme="light"] .token.attr-name,
[data-theme="light"] .token.string,
[data-theme="light"] .token.char,
[data-theme="light"] .token.builtin,
[data-theme="light"] .token.inserted {
    color: #DC2626;
}

[data-theme="light"] .token.operator,
[data-theme="light"] .token.entity,
[data-theme="light"] .token.url,
[data-theme="light"] .language-css .token.string,
[data-theme="light"] .style .token.string {
    color: #D97706;
}

[data-theme="light"] .token.atrule,
[data-theme="light"] .token.attr-value,
[data-theme="light"] .token.keyword {
    color: #2563EB;
}

[data-theme="light"] .token.function,
[data-theme="light"] .token.class-name {
    color: #7C3AED;
}

[data-theme="light"] .token.regex,
[data-theme="light"] .token.important,
[data-theme="light"] .token.variable {
    color: #EA580C;
}

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

@media (max-width: 1024px) {
    html {
        font-size: 16px;
    }
    
    .header-content {
        padding: 0 var(--space-md);
    }
    
    .reading-area {
        padding: var(--space-xl) var(--space-md);
    }
    
    .status-content {
        padding: 0 var(--space-md);
    }
    
    :root {
        --sidebar-width: 280px;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 16px;
    }
    
    :root {
        --header-height: 56px;
        --status-bar-height: 40px;
        --sidebar-width: 100%;
    }
    
    /* 移动端标题栏宽度适配 */
    .header {
        width: 100%;
        box-sizing: border-box;
    }
    
    .header-content {
        width: 100%;
        max-width: 100%;
        margin: 0;
        padding: 0 var(--space-sm);
        box-sizing: border-box;
    }
    
    .logo-text {
        display: none;
    }
    
    /* 移动端标题栏布局修复：防止长文件名挤出右侧图标 */
    .header-left {
        flex: 1;
        min-width: 0;
        overflow: hidden;
    }
    
    .file-info {
        overflow: hidden;
        min-width: 0;
    }
    
    .header-right {
        flex-shrink: 0;
    }
    
    /* 移动端文件名宽度限制，避免挤出右侧图标 */
    .file-name {
        max-width: 120px;
    }
    
    /* 移动端底部状态栏宽度适配 */
    .status-bar {
        width: 100%;
        box-sizing: border-box;
    }
    
    .status-content {
        width: 100%;
        max-width: 100%;
        margin: 0;
        padding: 0 var(--space-sm);
        box-sizing: border-box;
        gap: var(--space-lg);
    }
    
    .status-item {
        font-size: 0.75rem;
    }
    
    /* 移动端阅读区域优化 - 与 header/status-bar 视觉宽度一致 */
    .reading-area {
        width: 100%;
        max-width: 100%;
        padding: var(--space-lg) 0;
    }
    
    .markdown-content {
        padding: var(--space-md);
        border-radius: 0;
        margin: 0;
    }
    
    .welcome-content {
        padding: var(--space-xl);
    }
    
    .welcome-icon svg {
        width: 80px;
        height: 80px;
    }
    
    .markdown-content h1 {
        font-size: 1.75rem;
    }
    
    .markdown-content h2 {
        font-size: 1.375rem;
    }
    
    .markdown-content h3 {
        font-size: 1.125rem;
    }
    
    /* 移动端表格滚动优化 */
    .markdown-content .table-wrapper {
        margin: 1.25em 0;
        /* 添加滚动提示阴影 */
        box-shadow: inset -4px 0 8px -4px rgba(0,0,0,0.08);
    }
    
    .markdown-content table {
        font-size: 0.9rem;
    }
    
    .settings-sidebar {
        height: calc(100vh - var(--header-height));
        top: var(--header-height);
    }
    
    /* 移动端目录导航 - 显示在header下方的内容区域顶部 */
    .floating-toc {
        position: fixed;
        left: 0;
        right: 0;
        top: var(--header-height);
        transform: none;
        max-height: 50vh;
        max-width: 100%;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        box-shadow: 0 4px 20px var(--color-shadow);
        z-index: 95;
        overflow-y: auto;
    }
    
    .floating-toc-nav {
        max-height: calc(50vh - 16px);
        padding: var(--space-sm) var(--space-md);
    }
    
    .floating-toc-nav .toc-list {
        display: block;
    }
    
    .floating-toc-nav .toc-item {
        margin-bottom: var(--space-xs);
    }
    
    .floating-toc-nav .toc-link {
        max-width: none;
        font-size: 0.875rem;
        padding: var(--space-xs) var(--space-sm);
    }
    
    /* 保持层级缩进 */
    .floating-toc-nav .toc-item[data-level="1"] .toc-link {
        padding-left: var(--space-sm);
        font-weight: 500;
    }
    
    .floating-toc-nav .toc-item[data-level="2"] .toc-link {
        padding-left: calc(var(--space-sm) + 16px);
        font-size: 0.8125rem;
    }
    
    .floating-toc-nav .toc-item[data-level="3"] .toc-link {
        padding-left: calc(var(--space-sm) + 32px);
        font-size: 0.75rem;
    }
    
    .floating-toc-nav .toc-link.active {
        background: linear-gradient(90deg, var(--color-accent), #F39C12);
        -webkit-background-clip: unset;
        background-clip: unset;
        -webkit-text-fill-color: unset;
        color: white;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 15px;
    }
    
    /* 小屏幕文件名更短 */
    .file-name {
        max-width: 80px;
    }
    
    .header-left {
        flex: 1;
        min-width: 0;
        overflow: hidden;
        gap: var(--space-sm);
    }
    
    .header-right {
        flex-shrink: 0;
    }
    
    .status-icon {
        display: none;
    }
    
    .progress-text {
        display: none;
    }
    
    .welcome-title {
        font-size: 1.25rem;
    }
    
    /* 小屏幕阅读区域 - 保持与 header/status-bar 宽度一致 */
    .reading-area {
        padding: var(--space-md) 0;
    }
    
    .markdown-content {
        padding: var(--space-sm);
        border-radius: 0;
    }
    
    .markdown-content pre {
        padding: var(--space-sm);
        font-size: 0.8rem;
    }
    
    /* 移动端表格滚动优化 */
    .markdown-content .table-wrapper {
        margin: 1em 0;
        border-radius: var(--radius-sm);
        /* 添加滚动提示阴影 */
        box-shadow: inset -4px 0 8px -4px rgba(0,0,0,0.1);
    }
    
    .markdown-content .table-wrapper::-webkit-scrollbar {
        height: 4px;
    }
    
    .markdown-content table {
        font-size: 0.85rem;
    }
    
    .markdown-content th,
    .markdown-content td {
        padding: var(--space-xs) var(--space-sm);
        white-space: nowrap;
    }
    
    .bg-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    /* 移动端设置行改为单列布局 */
    .setting-row {
        flex-direction: column;
        gap: var(--space-sm);
    }
    
    .setting-item .setting-select {
        padding: var(--space-xs) var(--space-sm);
        font-size: 0.75rem;
    }
    
    .setting-control-compact .size-btn {
        width: 24px;
        height: 24px;
    }
    
    .setting-control-compact .setting-value {
        font-size: 0.75rem;
        min-width: 36px;
    }
    
    .theme-btn {
        padding: var(--space-xs) var(--space-md);
        font-size: 0.8rem;
    }
}

/* ========================================
   Accessibility
   ======================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles */
:focus-visible {
    outline: 2px solid var(--color-link);
    outline-offset: 2px;
}

/* Hide file input - positioned off-screen but clickable via JS */
#fileInput {
    position: fixed;
    left: -9999px;
    top: -9999px;
    opacity: 0;
}