/**
 * Leitor Markdown - Styles
 * Desenvolvido por B20 Conteúdo Digital
 * https://www.b20.com.br
 */

/* ========================================
   CSS Custom Properties
   ======================================== */
:root {
    /* Brand Colors */
    --primary-color: #FF9900;
    --secondary-color: #232F3E;
    --accent-color: #37475A;
    --surface-color: #FFFFFF;
    --text-color: #146EB4;

    /* Derived Colors */
    --primary-hover: color-mix(in srgb, var(--primary-color) 85%, black);
    --primary-light: color-mix(in srgb, var(--primary-color) 15%, white);
    --primary-alpha: rgba(255, 153, 0, 0.1);

    /* Light Theme */
    --bg-color: #f8f9fa;
    --bg-secondary: #ffffff;
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a68;
    --text-muted: #8a8aa3;
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;

    /* Editor Colors */
    --editor-bg: #ffffff;
    --editor-text: #24292e;
    --editor-line-bg: #f6f8fa;
    --editor-line-text: #6e7781;
    --editor-selection: rgba(255, 153, 0, 0.2);
    --editor-cursor: var(--primary-color);

    /* Preview Colors */
    --preview-bg: #ffffff;
    --preview-text: #24292e;
    --preview-heading: #1a1a2e;
    --preview-link: var(--primary-color);
    --preview-code-bg: #f6f8fa;
    --preview-blockquote: #6a737d;
    --preview-hr: #e1e4e8;

    /* Code Syntax */
    --code-keyword: #d73a49;
    --code-string: #032f62;
    --code-comment: #6a737d;
    --code-function: #6f42c1;
    --code-number: #005cc5;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* Z-Index */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
    --z-toast: 800;

    /* Layout */
    --header-height: 60px;
    --bottom-nav-height: 65px;
    --sidebar-width: 280px;
    --toolbar-height: 48px;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-color: #0d1117;
    --bg-secondary: #161b22;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --border-color: #30363d;
    --border-light: #21262d;

    --editor-bg: #0d1117;
    --editor-text: #e6edf3;
    --editor-line-bg: #161b22;
    --editor-line-text: #6e7681;

    --preview-bg: #0d1117;
    --preview-text: #e6edf3;
    --preview-heading: #ffffff;
    --preview-code-bg: #161b22;
    --preview-blockquote: #8b949e;
    --preview-hr: #30363d;

    --code-keyword: #ff7b72;
    --code-string: #a5d6ff;
    --code-comment: #8b949e;
    --code-function: #d2a8ff;
    --code-number: #79c0ff;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

/* ========================================
   CSS Reset & Base
   ======================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: clamp(14px, 2.5vw, 16px);
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-color);
    min-height: 100vh;
    min-height: 100dvh;
    overflow-x: hidden;
    padding-top: var(--header-height);
    padding-bottom: var(--bottom-nav-height);
    transition: background-color var(--transition-base), color var(--transition-base);
}

@media (min-width: 768px) {
    body {
        padding-bottom: 0;
    }
}

/* Skip Link */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    z-index: var(--z-tooltip);
    text-decoration: none;
    font-weight: 600;
}

.skip-link:focus {
    top: var(--spacing-sm);
}

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ========================================
   Typography
   ======================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-primary);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: 500;
    line-height: 1.5;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    min-height: 44px;
}

.btn:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.btn.primary {
    background: var(--primary-color);
    color: white;
}

.btn.primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

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

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

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.btn-icon:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.btn-icon.small {
    width: 32px;
    height: 32px;
    font-size: var(--font-size-sm);
}

.btn-icon i {
    font-size: 1.125rem;
}

/* ========================================
   Header
   ======================================== */
.app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-md);
    box-shadow: var(--shadow-md);
    z-index: var(--z-fixed);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    transition: background-color var(--transition-base);
}

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

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

.header-logo .logo-icon {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.logo-img {
    width: 28px;
    height: 28px;
    object-fit: contain;
}

.header-logo h1 {
    font-size: var(--font-size-lg);
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

@media (max-width: 480px) {
    .header-logo h1 {
        display: none;
    }
}

.desktop-nav {
    display: none;
}

@media (min-width: 768px) {
    .desktop-nav {
        display: flex;
        gap: var(--spacing-xs);
    }

    .menu-toggle {
        display: none;
    }
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.nav-btn:hover {
    background: var(--primary-alpha);
    color: var(--primary-color);
}

.nav-btn.active {
    background: var(--primary-color);
    color: white;
}

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

/* ========================================
   Sidebar
   ======================================== */
.sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    transform: translateX(-100%);
    transition: transform var(--transition-base);
    z-index: var(--z-fixed);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar.open {
    transform: translateX(0);
}

@media (max-width: 767px) {
    .sidebar {
        bottom: var(--bottom-nav-height);
    }
}

.sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: calc(var(--z-fixed) - 1);
}

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

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

.sidebar-header h2 {
    font-size: var(--font-size-base);
    font-weight: 600;
}

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

.sidebar-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-bottom: var(--spacing-sm);
}

.sidebar-btn:hover {
    background: var(--primary-alpha);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.sidebar-btn.primary {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

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

.sidebar-section {
    margin-top: var(--spacing-lg);
}

.sidebar-section h3 {
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
}

.recent-docs-list,
.samples-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.recent-doc-item,
.sample-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
    width: 100%;
}

.recent-doc-item:hover,
.sample-item:hover {
    background: var(--primary-alpha);
    color: var(--primary-color);
}

.recent-doc-item i,
.sample-item i {
    font-size: var(--font-size-base);
    width: 20px;
    text-align: center;
}

.sidebar-footer {
    padding: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.sidebar-footer .b20-link {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

.sidebar-footer .b20-link:hover {
    color: var(--primary-color);
}

/* ========================================
   Main Content
   ======================================== */
.main-content {
    display: flex;
    flex-direction: column;
    height: calc(100vh - var(--header-height) - var(--bottom-nav-height));
    height: calc(100dvh - var(--header-height) - var(--bottom-nav-height));
    overflow: hidden;
}

@media (min-width: 768px) {
    .main-content {
        height: calc(100vh - var(--header-height));
        height: calc(100dvh - var(--header-height));
    }
}

/* ========================================
   Toolbar
   ======================================== */
.toolbar {
    position: sticky;
    top: 0;
    z-index: 50;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
    flex-shrink: 0;
}

.toolbar::-webkit-scrollbar {
    display: none;
}

.toolbar-group {
    display: flex;
    align-items: center;
    gap: 2px;
}

.toolbar-divider {
    width: 1px;
    height: 24px;
    background: var(--border-color);
    margin: 0 var(--spacing-xs);
}

.toolbar-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.toolbar-btn:hover {
    background: var(--primary-alpha);
    color: var(--primary-color);
}

.toolbar-btn:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 1px;
}

.toolbar-btn i {
    font-size: var(--font-size-sm);
}

.toolbar-text {
    font-size: var(--font-size-xs);
    font-weight: 700;
    font-family: var(--font-mono);
}

.toolbar-spacer {
    flex: 1;
}

.toolbar-stats {
    display: none;
}

@media (min-width: 768px) {
    .toolbar-stats {
        display: flex;
        gap: var(--spacing-md);
    }
}

.stat-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

.stat-item i {
    font-size: 0.75rem;
}

/* ========================================
   Search Bar
   ======================================== */
.search-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.search-bar[hidden] {
    display: none;
}

.search-inputs {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    flex: 1;
}

.search-field {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    flex: 1;
    min-width: 150px;
}

.search-field i {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

.search-field input {
    flex: 1;
    border: none;
    background: transparent;
    font-family: inherit;
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    outline: none;
    min-width: 100px;
}

.search-field input::placeholder {
    color: var(--text-muted);
}

.search-count {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    white-space: nowrap;
}

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

.search-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: var(--font-size-xs);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.search-btn:hover {
    background: var(--primary-alpha);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.search-btn.close {
    border: none;
}

.search-options {
    display: flex;
    gap: var(--spacing-md);
    width: 100%;
    padding-top: var(--spacing-xs);
}

.search-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    cursor: pointer;
}

.search-option input {
    accent-color: var(--primary-color);
}

/* ========================================
   Editor Container
   ======================================== */
.editor-container {
    display: flex;
    flex: 1;
    overflow: hidden;
    position: relative;
}

.editor-container[data-view="editor"] .preview-panel,
.editor-container[data-view="editor"] .resize-handle {
    display: none;
}

.editor-container[data-view="preview"] .editor-panel,
.editor-container[data-view="preview"] .resize-handle {
    display: none;
}

.editor-container[data-view="editor"] .editor-panel,
.editor-container[data-view="preview"] .preview-panel {
    flex: 1;
}

/* Editor Panel */
.editor-panel,
.preview-panel {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 0;
    overflow: hidden;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--editor-line-bg);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.panel-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.panel-actions {
    display: flex;
    gap: var(--spacing-xs);
}

/* Editor Wrapper */
.editor-wrapper {
    display: flex;
    flex: 1;
    overflow: hidden;
    background: var(--editor-bg);
}

.line-numbers {
    display: none;
    flex-direction: column;
    padding: var(--spacing-md) var(--spacing-sm);
    background: var(--editor-line-bg);
    border-right: 1px solid var(--border-color);
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    line-height: 1.6;
    color: var(--editor-line-text);
    text-align: right;
    user-select: none;
    overflow: hidden;
    min-width: 50px;
}

.line-numbers.visible {
    display: flex;
}

.line-number {
    height: 1.6em;
}

.markdown-editor {
    flex: 1;
    width: 100%;
    padding: var(--spacing-md);
    background: var(--editor-bg);
    border: none;
    font-family: var(--font-mono);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--editor-text);
    resize: none;
    outline: none;
    overflow-y: auto;
    tab-size: 4;
}

.markdown-editor::placeholder {
    color: var(--text-muted);
}

.markdown-editor::selection {
    background: var(--editor-selection);
}

/* Resize Handle */
.resize-handle {
    width: 6px;
    background: var(--border-color);
    cursor: col-resize;
    transition: background var(--transition-fast);
    flex-shrink: 0;
}

.resize-handle:hover,
.resize-handle.active {
    background: var(--primary-color);
}

/* Preview Wrapper */
.preview-wrapper {
    flex: 1;
    overflow-y: auto;
    background: var(--preview-bg);
}

.markdown-preview {
    padding: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
}

/* ========================================
   Markdown Preview Styles
   ======================================== */
.markdown-preview h1,
.markdown-preview h2,
.markdown-preview h3,
.markdown-preview h4,
.markdown-preview h5,
.markdown-preview h6 {
    color: var(--preview-heading);
    margin-top: 1.5em;
    margin-bottom: 0.5em;
    font-weight: 600;
    line-height: 1.3;
}

.markdown-preview h1 {
    font-size: 2em;
    padding-bottom: 0.3em;
    border-bottom: 1px solid var(--preview-hr);
}

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

.markdown-preview h3 {
    font-size: 1.25em;
}

.markdown-preview h4 {
    font-size: 1em;
}

.markdown-preview h5 {
    font-size: 0.875em;
}

.markdown-preview h6 {
    font-size: 0.85em;
    color: var(--text-muted);
}

.markdown-preview p {
    margin-bottom: 1em;
    color: var(--preview-text);
}

.markdown-preview a {
    color: var(--preview-link);
    text-decoration: none;
}

.markdown-preview a:hover {
    text-decoration: underline;
}

.markdown-preview strong {
    font-weight: 600;
}

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

.markdown-preview del {
    text-decoration: line-through;
    color: var(--text-muted);
}

.markdown-preview ul,
.markdown-preview ol {
    margin-bottom: 1em;
    padding-left: 2em;
}

.markdown-preview li {
    margin-bottom: 0.25em;
}

.markdown-preview li>ul,
.markdown-preview li>ol {
    margin-bottom: 0;
    margin-top: 0.25em;
}

/* Task Lists */
.markdown-preview ul.contains-task-list {
    list-style: none;
    padding-left: 0;
}

.markdown-preview li.task-list-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
}

.markdown-preview li.task-list-item input[type="checkbox"] {
    margin-top: 0.3em;
    accent-color: var(--primary-color);
}

/* Blockquote */
.markdown-preview blockquote {
    margin: 1em 0;
    padding: var(--spacing-sm) var(--spacing-md);
    border-left: 4px solid var(--primary-color);
    background: var(--primary-alpha);
    color: var(--preview-blockquote);
}

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

/* Code */
.markdown-preview code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    padding: 0.2em 0.4em;
    background: var(--preview-code-bg);
    border-radius: var(--radius-sm);
}

.markdown-preview pre {
    margin: 1em 0;
    padding: var(--spacing-md);
    background: var(--preview-code-bg);
    border-radius: var(--radius-md);
    overflow-x: auto;
}

.markdown-preview pre code {
    padding: 0;
    background: transparent;
    font-size: var(--font-size-sm);
    line-height: 1.5;
}

/* Tables */
.markdown-preview table {
    width: 100%;
    margin: 1em 0;
    border-collapse: collapse;
    overflow-x: auto;
    display: block;
}

.markdown-preview th,
.markdown-preview td {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    text-align: left;
}

.markdown-preview th {
    background: var(--editor-line-bg);
    font-weight: 600;
}

.markdown-preview tr:nth-child(even) {
    background: var(--border-light);
}

/* Horizontal Rule */
.markdown-preview hr {
    margin: 2em 0;
    border: none;
    border-top: 2px solid var(--preview-hr);
}

/* Images */
.markdown-preview img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: 1em 0;
}

/* ========================================
   Table of Contents
   ======================================== */
.toc-panel {
    position: fixed;
    top: calc(var(--header-height) + var(--toolbar-height));
    right: 0;
    width: 280px;
    max-height: calc(100vh - var(--header-height) - var(--toolbar-height) - var(--bottom-nav-height));
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    z-index: var(--z-dropdown);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.toc-panel[hidden] {
    display: none;
}

@media (min-width: 768px) {
    .toc-panel {
        max-height: calc(100vh - var(--header-height) - var(--toolbar-height));
    }
}

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

.toc-header h3 {
    font-size: var(--font-size-sm);
    font-weight: 600;
}

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

.toc-item {
    display: block;
    padding: var(--spacing-xs) var(--spacing-sm);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    margin-bottom: 2px;
}

.toc-item:hover {
    background: var(--primary-alpha);
    color: var(--primary-color);
    text-decoration: none;
}

.toc-item.level-1 {
    font-weight: 600;
}

.toc-item.level-2 {
    padding-left: calc(var(--spacing-sm) + 12px);
}

.toc-item.level-3 {
    padding-left: calc(var(--spacing-sm) + 24px);
    font-size: var(--font-size-xs);
}

.toc-item.level-4,
.toc-item.level-5,
.toc-item.level-6 {
    padding-left: calc(var(--spacing-sm) + 36px);
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

/* ========================================
   Bottom Navigation
   ======================================== */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--bottom-nav-height);
    background: var(--bg-secondary);
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    z-index: var(--z-fixed);
    padding-bottom: env(safe-area-inset-bottom, 0);
    border-top: 1px solid var(--border-color);
}

@media (min-width: 768px) {
    .bottom-nav {
        display: none;
    }
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    padding: var(--spacing-xs) var(--spacing-md);
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-family: inherit;
    font-size: 10px;
    cursor: pointer;
    transition: all var(--transition-fast);
    min-width: 56px;
}

.nav-item i {
    font-size: 1.25rem;
    transition: transform var(--transition-fast);
}

.nav-item.active {
    color: var(--primary-color);
}

.nav-item.active i {
    transform: scale(1.1);
}

.nav-item-fab {
    width: 52px;
    height: 52px;
    background: var(--primary-color);
    border-radius: 50%;
    margin-top: -20px;
    color: white;
    box-shadow: 0 4px 12px rgba(255, 153, 0, 0.4);
}

.nav-item-fab:active {
    transform: scale(0.95);
}

.nav-item-fab span {
    display: none;
}

.nav-item-fab i {
    font-size: 1.5rem;
}

/* Quick Actions Menu */
.quick-actions-menu {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
}

.quick-actions-menu[hidden] {
    display: none;
}

.quick-actions-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
}

.quick-actions-content {
    position: absolute;
    bottom: calc(var(--bottom-nav-height) + var(--spacing-md));
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

.quick-action-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: var(--font-size-xs);
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    min-width: 56px;
}

.quick-action-item:hover {
    background: var(--primary-alpha);
    color: var(--primary-color);
}

.quick-action-item i {
    font-size: 1.25rem;
}

/* ========================================
   Modals
   ======================================== */
.modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    padding: var(--spacing-md);
}

.modal[hidden] {
    display: none;
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    animation: modalIn 0.2s ease;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(10px);
    }

    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-content.modal-large {
    max-width: 800px;
    width: 90%;
    max-height: 85vh;
}

.icon-picker-search {
    margin-bottom: var(--spacing-md);
}

.icon-picker-search input {
    width: 100%;
    padding: var(--spacing-sm);
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: var(--font-size-md);
}

.icon-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(48px, 1fr));
    gap: var(--spacing-sm);
    max-height: 60vh;
    overflow-y: auto;
    padding: 2px;
}

.icon-item {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    aspect-ratio: 1;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 1.25rem;
    color: var(--text-secondary);
}

.icon-item:hover {
    background: var(--primary-alpha);
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: scale(1.1);
}

.modal-content.modal-small {
    max-width: 400px;
}

.modal-content.modal-large {
    max-width: 700px;
}

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

.modal-header h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.modal-body {
    flex: 1;
    padding: var(--spacing-lg);
    overflow-y: auto;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* Form Elements */
.form-group {
    margin-bottom: var(--spacing-md);
}

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

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: var(--font-size-base);
    color: var(--text-primary);
    transition: border-color var(--transition-fast);
}

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

.form-row {
    display: flex;
    gap: var(--spacing-md);
}

.form-row .form-group {
    flex: 1;
}

/* Settings */
.settings-section {
    margin-bottom: var(--spacing-xl);
}

.settings-section h3 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid var(--border-color);
}

.setting-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
}

.setting-item label {
    font-size: var(--font-size-sm);
    color: var(--text-primary);
}

.setting-item select {
    width: auto;
    min-width: 150px;
}

.setting-item.toggle input[type="checkbox"] {
    width: 44px;
    height: 24px;
    appearance: none;
    background: var(--border-color);
    border-radius: var(--radius-full);
    position: relative;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.setting-item.toggle input[type="checkbox"]::before {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    transition: transform var(--transition-fast);
}

.setting-item.toggle input[type="checkbox"]:checked {
    background: var(--primary-color);
}

.setting-item.toggle input[type="checkbox"]:checked::before {
    transform: translateX(20px);
}

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

.range-wrapper input[type="range"] {
    flex: 1;
    accent-color: var(--primary-color);
}

.range-wrapper span {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    min-width: 40px;
}

/* Table Size Grid */
.table-size-grid {
    display: grid;
    grid-template-columns: repeat(10, 1fr);
    gap: 2px;
    margin-bottom: var(--spacing-md);
}

.table-size-cell {
    aspect-ratio: 1;
    background: var(--border-color);
    border-radius: 2px;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.table-size-cell.active {
    background: var(--primary-color);
}

.table-size-label {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
}

/* Export Options */
.export-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.export-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.export-option:hover {
    border-color: var(--primary-color);
    background: var(--primary-alpha);
}

.export-option i {
    font-size: 2rem;
    color: var(--primary-color);
}

.export-option .export-title {
    font-weight: 600;
    color: var(--text-primary);
}

.export-option .export-desc {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    text-align: center;
}

/* Emoji Picker */
.emoji-picker {
    position: absolute;
    top: 100%;
    right: 0;
    width: 320px;
    max-height: 350px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    z-index: var(--z-popover);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.emoji-picker[hidden] {
    display: none;
}

.emoji-picker-header {
    padding: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

.emoji-picker-header input {
    width: 100%;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    outline: none;
}

.emoji-picker-categories {
    display: flex;
    padding: var(--spacing-xs);
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
}

.emoji-category-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1.25rem;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.emoji-category-btn:hover,
.emoji-category-btn.active {
    background: var(--primary-alpha);
}

.emoji-picker-content {
    flex: 1;
    padding: var(--spacing-sm);
    overflow-y: auto;
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 2px;
}

.emoji-item {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xs);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1.5rem;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.emoji-item:hover {
    background: var(--primary-alpha);
}

/* Shortcuts Grid */
.shortcuts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.shortcut-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm);
    background: var(--bg-color);
    border-radius: var(--radius-md);
}

.shortcut-label {
    font-size: var(--font-size-sm);
    color: var(--text-primary);
}

.shortcut-keys {
    display: flex;
    gap: var(--spacing-xs);
}

.shortcut-key {
    padding: 2px 8px;
    background: var(--border-color);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
}

/* ========================================
   Presentation Mode
   ======================================== */
.presentation-mode {
    position: fixed;
    inset: 0;
    background: var(--bg-color);
    z-index: var(--z-modal);
    display: flex;
    flex-direction: column;
}

.presentation-mode[hidden] {
    display: none;
}

.presentation-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.presentation-title {
    font-weight: 600;
    color: var(--text-primary);
}

.presentation-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.slide-counter {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.presentation-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    overflow: auto;
}

.presentation-slide {
    max-width: 1000px;
    width: 100%;
    padding: var(--spacing-2xl);
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

.presentation-slide h1 {
    font-size: 3rem;
    text-align: center;
    margin-bottom: 1em;
}

.presentation-slide h2 {
    font-size: 2rem;
}

.presentation-slide p,
.presentation-slide li {
    font-size: 1.5rem;
    line-height: 1.8;
}

/* ========================================
   Toast Notifications
   ======================================== */
.toast-container {
    position: fixed;
    bottom: calc(var(--bottom-nav-height) + var(--spacing-md));
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    z-index: var(--z-toast);
    pointer-events: none;
}

@media (min-width: 768px) {
    .toast-container {
        bottom: var(--spacing-lg);
        right: var(--spacing-lg);
        left: auto;
        transform: none;
    }
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    pointer-events: auto;
    animation: toastIn 0.3s ease;
    max-width: 350px;
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.toast.toast-out {
    animation: toastOut 0.3s ease forwards;
}

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

.toast-icon {
    font-size: 1.25rem;
}

.toast.success .toast-icon {
    color: #10b981;
}

.toast.error .toast-icon {
    color: #ef4444;
}

.toast.warning .toast-icon {
    color: #f59e0b;
}

.toast.info .toast-icon {
    color: #3b82f6;
}

.toast-message {
    flex: 1;
    font-size: var(--font-size-sm);
    color: var(--text-primary);
}

.toast-close {
    padding: var(--spacing-xs);
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.toast-close:hover {
    background: var(--border-light);
    color: var(--text-primary);
}

/* ========================================
   Footer
   ======================================== */
.app-footer {
    display: none;
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

@media (min-width: 768px) {
    .app-footer {
        display: block;
    }
}

.app-footer p {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
}

.app-footer .b20-link {
    color: var(--primary-color);
    font-weight: 600;
    transition: all var(--transition-fast);
}

.app-footer .b20-link:hover {
    text-decoration: underline;
}

/* ========================================
   Utility Classes
   ======================================== */
.hidden {
    display: none !important;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

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

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

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

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

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) var(--bg-color);
}

/* ========================================
   Print Styles
   ======================================== */
@media print {

    /* Hide UI elements */
    .app-header,
    .sidebar,
    .toolbar,
    .bottom-nav,
    .app-footer,
    .panel-header,
    .resize-handle,
    .editor-panel,
    .toc-panel,
    .quick-actions-menu,
    .toast-container,
    .modal,
    .emoji-picker,
    .skip-link {
        display: none !important;
    }

    /* Reset layout containers */
    html,
    body,
    .main-content,
    .editor-container,
    .preview-panel,
    .preview-wrapper {
        height: auto !important;
        min-height: 0 !important;
        overflow: visible !important;
        position: static !important;
        display: block !important;
        padding: 0 !important;
        margin: 0 !important;
        width: 100% !important;
        background: white !important;
    }

    /* Ensure text is black and readable */
    body {
        color: black !important;
        font-size: 12pt;
    }

    /* Markdown Preview specific fixes */
    .markdown-preview {
        max-width: none !important;
        padding: 2cm !important;
        margin: 0 !important;
        width: 100% !important;
        box-shadow: none !important;
        background: white !important;
        color: black !important;
    }

    /* Print typography improvements */
    .markdown-preview a {
        text-decoration: underline;
        color: black !important;
    }

    .markdown-preview a[href^="http"]::after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
        color: #666;
    }

    /* Avoid breaking elements across pages */
    .markdown-preview h1,
    .markdown-preview h2,
    .markdown-preview h3,
    .markdown-preview h4,
    .markdown-preview h5,
    .markdown-preview h6 {
        page-break-after: avoid;
        break-after: avoid;
        color: black !important;
    }

    .markdown-preview p,
    .markdown-preview ul,
    .markdown-preview ol,
    .markdown-preview table,
    .markdown-preview pre,
    .markdown-preview blockquote {
        page-break-inside: avoid;
        break-inside: avoid;
    }

    /* Improve code block printing */
    .markdown-preview pre {
        border: 1px solid #ccc;
        white-space: pre-wrap;
        word-wrap: break-word;
    }

    .markdown-preview code {
        background-color: transparent !important;
        border: 1px solid #eee;
        color: black !important;
    }

    /* Improve table printing */
    .markdown-preview table {
        border-collapse: collapse !important;
        width: 100% !important;
    }

    .markdown-preview th,
    .markdown-preview td {
        border: 1px solid #000 !important;
        padding: 5px !important;
    }
}

/* ========================================
   Focus Styles
   ======================================== */
:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

button:focus:not(:focus-visible),
a:focus:not(:focus-visible),
input:focus:not(:focus-visible),
select:focus:not(:focus-visible),
textarea:focus:not(:focus-visible) {
    outline: none;
}

/* ========================================
   Selection Styles
   ======================================== */
::selection {
    background: var(--primary-alpha);
    color: var(--text-primary);
}

/* ========================================
   Reduced Motion
   ======================================== */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}