/* ============================================
   Canvas Document Editor Styles
   Features: A4 page, rulers, word-like UI
   ============================================ */

/* Canvas Sidebar Container */
.sidebar2.canvas-sidebar {
    position: fixed;
    right: 0;
    top: 0;
    bottom: 0;
    width: 900px;
    max-width: 90vw;
    background: #f5f5f5;
    box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform 0.3s ease;
}

.sidebar2.canvas-sidebar[aria-hidden="false"] {
    transform: translateX(0);
}

/* Canvas Fullscreen Mode */
.sidebar2.canvas-sidebar.canvas-fullscreen {
    width: 100vw !important;
    max-width: 100vw !important;
    left: 0 !important;
    z-index: 99999 !important;
}

/* Canvas Header */
.canvas-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    background: #3c3c3c;
    border-bottom: 1px solid #555;
    min-height: 50px;
}

.canvas-header h3 {
    margin: 0;
    font-size: 16px;
    font-weight: 500;
    color: #ffffff;
}

.canvas-header-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

.canvas-header-btn,
.canvas-close-btn {
    background: none;
    border: none;
    padding: 8px;
    cursor: pointer;
    border-radius: 4px;
    transition: background 0.2s;
    color: #ccc;
    font-size: 16px;
}

.canvas-header-btn:hover,
.canvas-close-btn:hover {
    background: #555;
    color: #fff;
}

.canvas-close-btn {
    font-size: 24px;
    font-weight: bold;
}

/* Canvas Toolbar */
.canvas-toolbar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: #444;
    border-bottom: 1px solid #555;
    flex-wrap: wrap;
    overflow-x: auto;
}

.canvas-tool-btn {
    min-width: 36px;
    height: 36px;
    padding: 8px;
    background: #555;
    border: 1px solid #666;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ddd;
}

.canvas-tool-btn:hover {
    background: #666;
    border-color: #777;
    color: #fff;
}

.canvas-tool-btn:active,
.canvas-tool-btn[aria-pressed="true"] {
    background: #4a9eff;
    border-color: #4a9eff;
    color: #fff;
}

.canvas-tool-btn i {
    font-size: 16px;
}

/* Font Size Selector */
.canvas-font-size {
    height: 36px;
    padding: 0 12px;
    border: 1px solid #666;
    border-radius: 4px;
    background: #555;
    color: #ddd;
    cursor: pointer;
    font-size: 14px;
}

.canvas-font-size:focus {
    outline: none;
    border-color: #4a9eff;
    background: #666;
}

/* Page Size Selector */
.canvas-page-size {
    height: 36px;
    padding: 0 12px;
    border: 1px solid #666;
    border-radius: 4px;
    background: #555;
    color: #ddd;
    cursor: pointer;
    font-size: 14px;
    min-width: 100px;
}

.canvas-page-size:focus {
    outline: none;
    border-color: #4a9eff;
    background: #666;
}

/* Color Pickers */
.canvas-color-picker {
    width: 36px;
    height: 36px;
    padding: 2px;
    border: 1px solid #d0d0d0;
    border-radius: 4px;
    cursor: pointer;
    background: #ffffff;
}

.canvas-color-picker::-webkit-color-swatch-wrapper {
    padding: 0;
}

.canvas-color-picker::-webkit-color-swatch {
    border: none;
    border-radius: 2px;
}

/* Toolbar Separator */
.canvas-toolbar-separator {
    width: 1px;
    height: 24px;
    background: #666;
    margin: 0 4px;
}

/* Status Bar (Microsoft Word style) */
.canvas-status-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 28px;
    background: #3c3c3c;
    border-top: 1px solid #555;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    color: #ccc;
    font-size: 12px;
    z-index: 9999;
}

.canvas-status-bar .status-left,
.canvas-status-bar .status-right {
    display: flex;
    gap: 12px;
    align-items: center;
}

.canvas-status-bar .status-separator {
    color: #666;
}

.canvas-status-bar span {
    cursor: default;
    user-select: none;
}

/* Canvas Stage (Main Editor Area) */
.canvas-stage {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    background: #2b2b2b;
    position: relative;
    padding: 24px 0 120px 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    scroll-behavior: smooth;
    height: calc(100vh - 180px);
    max-height: calc(100vh - 180px);
}

/* Horizontal Ruler */
.canvas-ruler,
.canvas-ruler-horizontal {
    display: none;
}

.ruler-mark {
    position: absolute;
    bottom: 0;
    width: 1px;
    height: 6px;
    background: #888;
}

.ruler-mark-major {
    height: 12px;
    background: #aaa;
}

.ruler-label {
    position: absolute;
    bottom: 14px;
    left: -5px;
    font-size: 9px;
    color: #aaa;
    font-family: monospace;
}

/* Canvas Document (A4 Page Container) */
.canvas-doc {
    width: 100%;
    max-width: calc(100% - 80px);
    margin: 0 auto;
    background: transparent;
    outline: none;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #333;
    display: block;
    gap: 28px;
    padding: 16px 0 120px 0;
    text-align: left;
}

.canvas-doc,
.canvas-doc * {
    text-align: left;
}

.canvas-doc,
.canvas-page {
    caret-color: #111;
}

.canvas-page:focus {
    caret-color: #111;
}


/* Individual Page */
.canvas-page {
    width: 210mm; /* A4 width */
    height: 297mm; /* A4 height - exact! */
    padding: 25mm; /* Standard margins */
    background: #ffffff;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
    box-sizing: border-box;
    outline: none;
    overflow: hidden;
    position: relative;
    page-break-after: always;
    margin: 0 auto;
    text-align: left;
}

.canvas-page,
.canvas-page * {
    text-align: left;
}

.canvas-page,
.canvas-doc {
    caret-color: #111;
}

.canvas-page:focus {
    caret-color: #111;
}

.canvas-page p,
.canvas-page div,
.canvas-page ul,
.canvas-page ol,
.canvas-page h1,
.canvas-page h2,
.canvas-page h3,
.canvas-page h4,
.canvas-page h5,
.canvas-page h6 {
    margin: 0 0 0.6em 0;
}

/* Ensure all text inside pages is left-aligned by default */
.canvas-page p,
.canvas-page div,
.canvas-page span,
.canvas-page li,
.canvas-page ul,
.canvas-page ol,
.canvas-page h1,
.canvas-page h2,
.canvas-page h3,
.canvas-page h4,
.canvas-page h5,
.canvas-page h6 {
    text-align: left;
}

.canvas-page[contenteditable="true"]:focus {
    box-shadow: 0 0 20px rgba(33, 150, 243, 0.4);
}

/* Page Number */
.canvas-page-number {
    position: absolute;
    bottom: 10mm;
    left: 50%;
    transform: translateX(-50%);
    font-size: 10px;
    color: #999;
    user-select: none;
    pointer-events: none;
}

/* Page break for print */
@media print {
    .canvas-stage {
        background: white;
        padding: 0;
        gap: 0;
    }
    
    .canvas-page {
        width: 210mm;
        height: 297mm;
        margin: 0;
        padding: 25mm;
        box-shadow: none;
        page-break-after: always;
    }
    
    .canvas-toolbar,
    .canvas-header,
    .canvas-ruler,
    .canvas-page-number,
    .canvas-status-bar {
        display: none !important;
    }
}

/* Empty Hint */
.canvas-empty-hint {
    position: absolute;
    top: 120px;
    left: 50%;
    transform: translateX(-50%);
    color: #999;
    font-size: 18px;
    pointer-events: none;
    opacity: 0.6;
    z-index: 1;
}

/* Highlight Styles */
.canvas-page .highlight,
.canvas-doc .highlight {
    padding: 2px 0;
    border-radius: 2px;
}

/* LaTeX Formula Styles */
.canvas-doc .latex-formula {
    display: inline-block;
    padding: 4px 8px;
    margin: 4px;
    background: #f9f9f9;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 14px;
}

/* Lists in Canvas */
.canvas-page ul,
.canvas-page ol,
.canvas-doc ul,
.canvas-doc ol {
    margin: 12px 0;
    padding-left: 32px;
}

.canvas-page ul li,
.canvas-page ol li,
.canvas-doc ul li,
.canvas-doc ol li {
    margin: 4px 0;
}

.canvas-page ul,
.canvas-doc ul {
    list-style-type: disc;
}

.canvas-page ol,
.canvas-doc ol {
    list-style-type: decimal;
}

/* Headings in Canvas */
.canvas-doc h1,
.canvas-doc h2,
.canvas-doc h3,
.canvas-doc h4,
.canvas-doc h5,
.canvas-doc h6 {
    margin: 16px 0 8px 0;
    font-weight: 600;
    line-height: 1.3;
}

.canvas-doc h1 { font-size: 32px; }
.canvas-doc h2 { font-size: 28px; }
.canvas-doc h3 { font-size: 24px; }
.canvas-doc h4 { font-size: 20px; }
.canvas-doc h5 { font-size: 18px; }
.canvas-doc h6 { font-size: 16px; }

/* Paragraphs */
.canvas-doc p {
    margin: 12px 0;
}

/* Code blocks */
.canvas-doc pre {
    background: #f5f5f5;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    padding: 12px;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    font-size: 14px;
}

.canvas-doc code {
    background: #f5f5f5;
    padding: 2px 6px;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    font-size: 14px;
}

.canvas-doc pre code {
    background: none;
    padding: 0;
}

/* Tables */
.canvas-doc table {
    border-collapse: collapse;
    width: 100%;
    margin: 12px 0;
}

.canvas-doc table th,
.canvas-doc table td {
    border: 1px solid #d0d0d0;
    padding: 8px;
    text-align: left;
}

.canvas-doc table th {
    background: #f5f5f5;
    font-weight: 600;
}

/* Links */
.canvas-doc a {
    color: #2196F3;
    text-decoration: underline;
}

.canvas-doc a:hover {
    color: #1976D2;
}

/* Blockquotes */
.canvas-doc blockquote {
    margin: 12px 0;
    padding: 12px 20px;
    border-left: 4px solid #2196F3;
    background: #f5f5f5;
    font-style: italic;
}

/* Collaborative Cursors */
.canvas-cursors {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 100;
}

.collab-cursor {
    position: absolute;
    width: 2px;
    height: 20px;
    background: #2196F3;
    transition: all 0.1s ease;
    pointer-events: none;
}

.collab-cursor::before {
    content: attr(data-user);
    position: absolute;
    top: -20px;
    left: 0;
    background: #2196F3;
    color: white;
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 11px;
    white-space: nowrap;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .sidebar2.canvas-sidebar {
        width: 100vw;
        max-width: 100vw;
    }
    
    .canvas-page {
        width: 100%;
        height: auto;
        min-height: 500px;
        padding: 20px;
    }
    
    .canvas-ruler-horizontal {
        display: none;
    }
}

/* Scrollbar Styling */
.canvas-stage::-webkit-scrollbar {
    width: 12px;
}

.canvas-stage::-webkit-scrollbar-track {
    background: #2b2b2b;
}

.canvas-stage::-webkit-scrollbar-thumb {
    background: #555;
    border-radius: 6px;
}

.canvas-stage::-webkit-scrollbar-thumb:hover {
    background: #666;
}

/* Toolbar Button Groups */
.canvas-toolbar-group {
    display: flex;
    gap: 4px;
    padding: 0 8px;
    border-right: 1px solid #e0e0e0;
}

.canvas-toolbar-group:last-child {
    border-right: none;
}

/* Tooltip for toolbar buttons */
.canvas-tool-btn[title]:hover::after {
    content: attr(title);
    position: absolute;
    bottom: -30px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    white-space: nowrap;
    z-index: 1000;
}

/* Selection highlight */
.canvas-doc ::selection {
    background: #b3d4fc;
}

/* Focus styles for accessibility */
.canvas-tool-btn:focus,
.canvas-font-size:focus,
.canvas-page-size:focus {
    outline: 2px solid #2196F3;
    outline-offset: 2px;
}

/* Animation for sidebar */
@keyframes slideInRight {
    from {
        transform: translateX(100%);
    }
    to {
        transform: translateX(0);
    }
}

.sidebar2.canvas-sidebar.animate-in {
    animation: slideInRight 0.3s ease;
}

/* Print-friendly styles */
@page {
    size: A4;
    margin: 0;
}

/* Disabled state for buttons */
.canvas-tool-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.canvas-tool-btn:disabled:hover {
    background: #ffffff;
    border-color: #d0d0d0;
}