BookStack Code Mirror - hacks/blob - content/mermaid-viewer/head.html

   1 <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/css/all.min.css"
   2     integrity="sha512-Evv84Mr4kqVGRNSgIGL/F/aIDqQb7xQ2vcrdIwxfjThSH8CSR7PBEakCr51Ck+w+/U6swU2Im1vVX0SVk9ABhg=="
   3     crossorigin="anonymous" referrerpolicy="no-referrer" />
   4
   5 <script src="https://cdnjs.cloudflare.com/ajax/libs/mermaid/11.7.0/mermaid.min.js"
   6     integrity="sha512-ecc+vlmmc1f51s2l/AeIC552wULnv9Q8bYJ4FbODxsL6jGrFoLaKnGkN5JUZNH6LBjkAYy9Q4fKqyTuFUIvvFA=="
   7     crossorigin="anonymous" referrerpolicy="no-referrer"></script>
   8 <script type="module">
   9     // Detect if BookStack's dark mode is enabled
  10     const isDarkMode = document.documentElement.classList.contains('dark-mode');
  11
  12     // Initialize Mermaid.js, dynamically setting the theme based on BookStack's mode
  13     mermaid.initialize({
  14         startOnLoad: false,
  15         securityLevel: 'loose',
  16         theme: isDarkMode ? 'dark' : 'default'
  17     });
  18
  19     // Zoom Level Configuration
  20     const ZOOM_LEVEL_MIN = 0.5;
  21     const ZOOM_LEVEL_MAX = 2.0;
  22     const ZOOM_LEVEL_INCREMENT = 0.1;
  23     const DEFAULT_ZOOM_SCALE = 1.0;
  24
  25     const DRAG_THRESHOLD_PIXELS = 3;
  26     const ZOOM_ANIMATION_CLASS_TIMEOUT_MS = 200;
  27
  28     const CSS_CLASSES = {
  29         CONTAINER: 'mermaid-container',
  30         VIEWPORT: 'mermaid-viewport',
  31         CONTENT: 'mermaid-content',
  32         DIAGRAM: 'mermaid-diagram',
  33         CONTROLS: 'mermaid-controls',
  34         ZOOM_CONTROLS: 'mermaid-zoom-controls',
  35         INTERACTION_ENABLED: 'interaction-enabled',
  36         DRAGGING: 'dragging',
  37         ZOOMING: 'zooming',
  38         LOCK_ICON: 'fa fa-lock',
  39         UNLOCK_ICON: 'fa fa-unlock',
  40         INTERACTIVE_HOVER: 'interactive-hover', // Class for 'grab' cursor state
  41         INTERACTIVE_PAN: 'interactive-pan',     // Class for 'grabbing' cursor state
  42         BUTTON_BASE: 'mermaid-viewer-button-base' // Base class for all viewer buttons
  43     };
  44
  45     class InteractiveMermaidViewer {
  46         constructor(container, mermaidCode) {
  47             this.container = container;
  48             this.mermaidCode = mermaidCode;
  49             this.scale = 1.0;
  50             this.translateX = 0;
  51             this.translateY = 0;
  52             this.isDragging = false;
  53             this.dragStarted = false;
  54             this.startX = 0;
  55             this.startY = 0;
  56
  57             const numDecimalPlaces = (ZOOM_LEVEL_INCREMENT.toString().split('.')[1] || '').length;
  58             this.zoomLevels = Array.from(
  59                 { length: Math.round((ZOOM_LEVEL_MAX - ZOOM_LEVEL_MIN) / ZOOM_LEVEL_INCREMENT) + 1 },
  60                 (_, i) => parseFloat((ZOOM_LEVEL_MIN + i * ZOOM_LEVEL_INCREMENT).toFixed(numDecimalPlaces))
  61             );
  62
  63             this.currentZoomIndex = this.zoomLevels.findIndex(level => Math.abs(level - DEFAULT_ZOOM_SCALE) < 1e-9);
  64             if (this.currentZoomIndex === -1) {
  65                 this.currentZoomIndex = Math.floor(this.zoomLevels.length / 2);
  66             }
  67             this.interactionEnabled = false;
  68             this.initialContentOffset = { x: 0, y: 0 };
  69
  70             // Cache DOM elements
  71             this.toggleInteractionBtn = null;
  72             this.copyCodeBtn = null;
  73             this.zoomInBtn = null;
  74             this.zoomOutBtn = null;
  75             this.zoomResetBtn = null;
  76
  77             // Use an AbortController for robust event listener cleanup.
  78             this.abortController = new AbortController();
  79
  80             // Bind event handlers for proper addition and removal
  81             this.boundMouseMoveHandler = this.handleMouseMove.bind(this);
  82             this.boundMouseUpHandler = this.handleMouseUp.bind(this);
  83             this.boundToggleInteraction = this.toggleInteraction.bind(this);
  84             this.boundCopyCode = this.copyCode.bind(this);
  85             this.boundZoomIn = this.handleZoomClick.bind(this, 1);
  86             this.boundZoomOut = this.handleZoomClick.bind(this, -1);
  87             this.boundResetZoom = this.resetZoom.bind(this);
  88             this.boundHandleWheel = this.handleWheel.bind(this);
  89             this.boundHandleMouseDown = this.handleMouseDown.bind(this);
  90             this.boundPreventDefault = e => e.preventDefault();
  91             this.boundPreventSelect = e => { if (this.isDragging || this.interactionEnabled) e.preventDefault(); };
  92
  93             this.setupViewer();
  94             this.setupEventListeners();
  95         }
  96
  97         /**
  98          * Creates the DOM structure for the viewer programmatically.
  99          * This is safer and more maintainable than using innerHTML with a large template string.
 100          */
 101         setupViewer() {
 102             const createButton = (title, iconClass, ...extraClasses) => {
 103                 const button = document.createElement('div');
 104                 button.className = `${CSS_CLASSES.BUTTON_BASE} ${extraClasses.join(' ')}`;
 105                 button.title = title;
 106                 const icon = document.createElement('i');
 107                 icon.className = iconClass;
 108                 icon.setAttribute('aria-hidden', 'true');
 109                 button.append(icon);
 110                 return button;
 111             };
 112
 113             const controls = document.createElement('div');
 114             controls.className = CSS_CLASSES.CONTROLS;
 115             this.toggleInteractionBtn = createButton('Toggle interaction', CSS_CLASSES.LOCK_ICON, 'mermaid-btn', 'toggle-interaction');
 116             this.copyCodeBtn = createButton('Copy code', 'fa fa-copy', 'mermaid-btn');
 117             controls.append(this.toggleInteractionBtn, this.copyCodeBtn);
 118
 119             const zoomControls = document.createElement('div');
 120             zoomControls.className = CSS_CLASSES.ZOOM_CONTROLS;
 121             this.zoomInBtn = createButton('Zoom in', 'fa fa-search-plus', 'mermaid-zoom-btn', 'zoom-in');
 122             this.zoomOutBtn = createButton('Zoom out', 'fa fa-search-minus', 'mermaid-zoom-btn', 'zoom-out');
 123             this.zoomResetBtn = createButton('Reset', 'fa fa-refresh', 'mermaid-zoom-btn', 'zoom-reset');
 124             zoomControls.append(this.zoomInBtn, this.zoomOutBtn, this.zoomResetBtn);
 125
 126             this.diagram = document.createElement('div');
 127             this.diagram.className = CSS_CLASSES.DIAGRAM;
 128             // Use textContent for security, preventing any potential HTML injection.
 129             // Mermaid will parse the text content safely.
 130             this.diagram.textContent = this.mermaidCode;
 131
 132             this.content = document.createElement('div');
 133             this.content.className = CSS_CLASSES.CONTENT;
 134             this.content.append(this.diagram);
 135
 136             this.viewport = document.createElement('div');
 137             this.viewport.className = CSS_CLASSES.VIEWPORT;
 138             this.viewport.append(this.content);
 139
 140             // Clear the container and append the new structure
 141             this.container.innerHTML = '';
 142             this.container.append(controls, zoomControls, this.viewport);
 143
 144             // Function to render the diagram and perform post-render setup
 145             const renderAndSetup = () => {
 146                 mermaid.run({ nodes: [this.diagram] }).then(() => {
 147                     this.adjustContainerHeight();
 148                     this.calculateInitialOffset();
 149                     this.centerDiagram();
 150                 }).catch(error => {
 151                     console.error("Mermaid rendering error for diagram:", this.mermaidCode, error);
 152                     this.diagram.innerHTML = `<p style="color: red; padding: 10px;">Error rendering diagram. Check console.</p>`;
 153                 });
 154             };
 155
 156             // Check if Font Awesome is loaded before rendering
 157             // This checks for the 'Font Awesome 6 Free' font family, which is common.
 158             // Adjust if your Font Awesome version uses a different family name for its core icons.
 159             if (document.fonts && typeof document.fonts.check === 'function' && document.fonts.check('1em "Font Awesome 6 Free"')) { // Check if Font Awesome is immediately available
 160                 renderAndSetup();
 161             } else if (document.fonts && document.fonts.ready) { // Simplified check for document.fonts.ready
 162                 document.fonts.ready.then(renderAndSetup).catch(err => {
 163                     renderAndSetup(); // Proceed with rendering even if font check fails after timeout/error
 164                 });
 165             } else {
 166                 renderAndSetup();
 167             }
 168         }
 169
 170         adjustContainerHeight() {
 171             const svgElement = this.content.querySelector('svg');
 172             if (svgElement) {
 173                 // Ensure the viewport takes up the height of the rendered SVG
 174                 this.viewport.style.height = '100%';
 175             }
 176         }
 177
 178         calculateInitialOffset() {
 179             const originalTransform = this.content.style.transform;
 180             this.content.style.transform = '';
 181             const contentRect = this.content.getBoundingClientRect();
 182             const viewportRect = this.viewport.getBoundingClientRect();
 183             this.initialContentOffset.x = contentRect.left - viewportRect.left;
 184             this.initialContentOffset.y = contentRect.top - viewportRect.top;
 185             this.content.style.transform = originalTransform;
 186         }
 187
 188         _getViewportCenterClientCoords() {
 189             const viewportRect = this.viewport.getBoundingClientRect();
 190             return {
 191                 clientX: viewportRect.left + viewportRect.width / 2,
 192                 clientY: viewportRect.top + viewportRect.height / 2,
 193             };
 194         }
 195
 196         setupEventListeners() {
 197             const { signal } = this.abortController;
 198
 199             this.toggleInteractionBtn.addEventListener('click', this.boundToggleInteraction, { signal });
 200             this.copyCodeBtn.addEventListener('click', this.boundCopyCode, { signal });
 201             this.zoomInBtn.addEventListener('click', this.boundZoomIn, { signal });
 202             this.zoomOutBtn.addEventListener('click', this.boundZoomOut, { signal });
 203             this.zoomResetBtn.addEventListener('click', this.boundResetZoom, { signal });
 204
 205             this.viewport.addEventListener('wheel', this.boundHandleWheel, { passive: false, signal });
 206             this.viewport.addEventListener('mousedown', this.boundHandleMouseDown, { signal });
 207
 208             // Listen on document for mousemove to handle dragging outside viewport
 209             document.addEventListener('mousemove', this.boundMouseMoveHandler, { signal });
 210             // Listen on window for mouseup to ensure drag ends even if mouse is released outside
 211             window.addEventListener('mouseup', this.boundMouseUpHandler, { signal, capture: true });
 212
 213             this.viewport.addEventListener('contextmenu', this.boundPreventDefault, { signal });
 214             this.viewport.addEventListener('selectstart', this.boundPreventSelect, { signal });
 215         }
 216
 217         toggleInteraction() {
 218             this.interactionEnabled = !this.interactionEnabled;
 219             const icon = this.toggleInteractionBtn.querySelector('i');
 220             this.toggleInteractionBtn.setAttribute('aria-pressed', this.interactionEnabled.toString());
 221
 222             if (this.interactionEnabled) {
 223                 icon.className = CSS_CLASSES.UNLOCK_ICON;
 224                 this.toggleInteractionBtn.title = 'Disable manual interaction';
 225                 this.viewport.classList.add(CSS_CLASSES.INTERACTION_ENABLED);
 226                 this.viewport.classList.add(CSS_CLASSES.INTERACTIVE_HOVER); // Set grab cursor state
 227                 this.viewport.classList.remove(CSS_CLASSES.INTERACTIVE_PAN); // Ensure pan cursor state is off
 228             } else {
 229                 icon.className = CSS_CLASSES.LOCK_ICON;
 230                 this.toggleInteractionBtn.title = 'Enable manual interaction';
 231                 this.viewport.classList.remove(CSS_CLASSES.INTERACTION_ENABLED);
 232                 this.viewport.classList.remove(CSS_CLASSES.INTERACTIVE_HOVER);
 233                 this.viewport.classList.remove(CSS_CLASSES.INTERACTIVE_PAN);
 234                 this.isDragging = false; // Ensure dragging stops if interaction is disabled mid-drag
 235                 this.dragStarted = false;
 236                 this.viewport.classList.remove(CSS_CLASSES.DRAGGING);
 237             }
 238         }
 239
 240         updateTransform() {
 241             this.content.style.transform = `translate(${this.translateX}px, ${this.translateY}px) scale(${this.scale})`;
 242         }
 243
 244         handleZoomClick(direction) {
 245             const { clientX, clientY } = this._getViewportCenterClientCoords();
 246             this.zoom(direction, clientX, clientY);
 247         }
 248
 249         handleWheel(e) {
 250             if (!this.interactionEnabled) return;
 251             // Prevent default browser scroll/zoom behavior when wheeling over the diagram
 252             e.preventDefault();
 253             this.content.classList.add(CSS_CLASSES.ZOOMING);
 254             const clientX = e.clientX;
 255             const clientY = e.clientY;
 256             if (e.deltaY > 0) this.zoom(-1, clientX, clientY);
 257             else this.zoom(1, clientX, clientY);
 258             setTimeout(() => this.content.classList.remove(CSS_CLASSES.ZOOMING), ZOOM_ANIMATION_CLASS_TIMEOUT_MS);
 259         }
 260
 261         handleMouseDown(e) {
 262             if (!this.interactionEnabled || e.button !== 0) return;
 263             e.preventDefault();
 264             this.isDragging = true;
 265             this.dragStarted = false;
 266             this.startX = e.clientX;
 267             this.startY = e.clientY;
 268             this.dragBaseTranslateX = this.translateX;
 269             this.dragBaseTranslateY = this.translateY;
 270             this.viewport.classList.add(CSS_CLASSES.DRAGGING);
 271             this.viewport.classList.remove(CSS_CLASSES.INTERACTIVE_HOVER);
 272             this.viewport.classList.add(CSS_CLASSES.INTERACTIVE_PAN);
 273             this.content.classList.remove(CSS_CLASSES.ZOOMING);
 274         }
 275
 276         handleMouseMove(e) {
 277             if (!this.isDragging) return;
 278             // e.preventDefault() is called only after dragStarted is true to allow clicks if threshold isn't met.
 279             const deltaX = e.clientX - this.startX;
 280             const deltaY = e.clientY - this.startY;
 281             if (!this.dragStarted && (Math.abs(deltaX) > DRAG_THRESHOLD_PIXELS || Math.abs(deltaY) > DRAG_THRESHOLD_PIXELS)) {
 282                 this.dragStarted = true;
 283             }
 284             if (this.dragStarted) {
 285                 e.preventDefault(); // Prevent text selection, etc., only when drag has truly started
 286                 this.translateX = this.dragBaseTranslateX + deltaX;
 287                 this.translateY = this.dragBaseTranslateY + deltaY;
 288                 this.updateTransform();
 289             }
 290         }
 291
 292         handleMouseUp() {
 293             if (this.isDragging) {
 294                 this.isDragging = false;
 295                 this.dragStarted = false;
 296                 this.viewport.classList.remove(CSS_CLASSES.DRAGGING);
 297                 this.viewport.classList.remove(CSS_CLASSES.INTERACTIVE_PAN);
 298                 if (this.interactionEnabled) { // Revert to grab cursor if interaction is still enabled
 299                     this.viewport.classList.add(CSS_CLASSES.INTERACTIVE_HOVER);
 300                 }
 301             }
 302             this.content.style.transform = `translate(${this.translateX}px, ${this.translateY}px) scale(${this.scale})`;
 303         }
 304
 305         centerDiagram() {
 306             const svgElement = this.content.querySelector('svg');
 307             if (svgElement) {
 308                 const viewportRect = this.viewport.getBoundingClientRect();
 309                 const svgIntrinsicWidth = svgElement.viewBox.baseVal.width || svgElement.clientWidth;
 310                 const svgIntrinsicHeight = svgElement.viewBox.baseVal.height || svgElement.clientHeight;
 311
 312                 const targetContentLeftRelativeToViewport = (viewportRect.width - (svgIntrinsicWidth * this.scale)) / 2;
 313                 const targetContentTopRelativeToViewport = (viewportRect.height - (svgIntrinsicHeight * this.scale)) / 2;
 314
 315                 this.translateX = targetContentLeftRelativeToViewport - this.initialContentOffset.x;
 316                 this.translateY = targetContentTopRelativeToViewport - this.initialContentOffset.y;
 317
 318                 // Initial centering constraints; may need adjustment for very large diagrams.
 319                 this.translateX = Math.max(0, this.translateX);
 320                 this.translateY = Math.max(0, this.translateY);
 321
 322                 this.updateTransform();
 323             }
 324         }
 325
 326         zoom(direction, clientX, clientY) {
 327             this.content.classList.add(CSS_CLASSES.ZOOMING);
 328             const oldScale = this.scale;
 329             let newZoomIndex = this.currentZoomIndex + direction;
 330
 331             if (newZoomIndex >= 0 && newZoomIndex < this.zoomLevels.length) {
 332                 this.currentZoomIndex = newZoomIndex;
 333                 const newScale = this.zoomLevels[this.currentZoomIndex];
 334
 335                 const viewportRect = this.viewport.getBoundingClientRect();
 336                 const pointXInContent = (clientX - viewportRect.left - this.translateX) / oldScale;
 337                 const pointYInContent = (clientY - viewportRect.top - this.translateY) / oldScale;
 338
 339                 this.translateX = (clientX - viewportRect.left) - (pointXInContent * newScale);
 340                 this.translateY = (clientY - viewportRect.top) - (pointYInContent * newScale);
 341                 this.scale = newScale;
 342                 this.updateTransform();
 343             }
 344             setTimeout(() => this.content.classList.remove(CSS_CLASSES.ZOOMING), ZOOM_ANIMATION_CLASS_TIMEOUT_MS);
 345         }
 346
 347         resetZoom() {
 348             this.content.classList.add(CSS_CLASSES.ZOOMING);
 349             this.currentZoomIndex = this.zoomLevels.findIndex(level => Math.abs(level - DEFAULT_ZOOM_SCALE) < 1e-9);
 350             if (this.currentZoomIndex === -1) { // Fallback if default not exactly in levels
 351                 this.currentZoomIndex = Math.floor(this.zoomLevels.length / 2);
 352             }
 353             this.scale = this.zoomLevels[this.currentZoomIndex];
 354             // Use requestAnimationFrame to ensure layout is stable before centering
 355             requestAnimationFrame(() => {
 356                 this.centerDiagram();
 357                 setTimeout(() => this.content.classList.remove(CSS_CLASSES.ZOOMING), ZOOM_ANIMATION_CLASS_TIMEOUT_MS);
 358             });
 359         }
 360
 361         async copyCode() {
 362             try {
 363                 await navigator.clipboard.writeText(this.mermaidCode);
 364                 this.showNotification('Copied!');
 365             } catch (_error) {
 366                 // Fallback for older browsers or if clipboard API fails
 367                 const textArea = document.createElement('textarea');
 368                 textArea.value = this.mermaidCode;
 369                 // Style to make it invisible
 370                 textArea.style.position = 'fixed';
 371                 textArea.style.top = '-9999px';
 372                 textArea.style.left = '-9999px';
 373                 document.body.appendChild(textArea);
 374                 textArea.select();
 375                 try {
 376                     document.execCommand('copy');
 377                     this.showNotification('Copied!');
 378                 } catch (copyError) {
 379                     console.error('Fallback copy failed:', copyError);
 380                     this.showNotification('Copy failed.', true); // Error
 381                 }
 382                 document.body.removeChild(textArea);
 383             }
 384         }
 385
 386         showNotification(message, isError = false) {
 387             if (window.$events) {
 388                 const eventName = isError ? 'error' : 'success';
 389                 window.$events.emit(eventName, message);
 390             } else {
 391                 // Fallback for if the event system is not available
 392                 console.warn('BookStack event system not found, falling back to console log for notification.');
 393                 if (isError) {
 394                     console.error(message);
 395                 } else {
 396                     console.log(message);
 397                 }
 398             }
 399         }
 400
 401         destroy() {
 402             // Abort all listeners attached with this controller's signal.
 403             this.abortController.abort();
 404             this.container.innerHTML = ''; // Clear the container's content
 405         }
 406     }
 407
 408     const mermaidViewers = [];
 409     function initializeMermaidViewers() {
 410         // Adjust the selector if your CMS wraps mermaid code blocks differently
 411         const codeBlocks = document.querySelectorAll('pre code.language-mermaid');
 412         for (const codeBlock of codeBlocks) {
 413             // Ensure we don't re-initialize if this script runs multiple times or content is dynamic
 414             if (codeBlock.dataset.mermaidViewerInitialized) continue;
 415
 416             const mermaidCode = codeBlock.textContent || codeBlock.innerHTML; // textContent is usually better
 417             const container = document.createElement('div');
 418             container.className = CSS_CLASSES.CONTAINER;
 419
 420             const replaceTarget = (codeBlock.nodeName === 'CODE') ? codeBlock.parentElement : codeBlock;
 421
 422             // Check if replaceTarget is already a mermaid-container (e.g. from previous init)
 423             if (replaceTarget.classList.contains(CSS_CLASSES.CONTAINER)) continue;
 424
 425             replaceTarget.after(container);
 426             replaceTarget.remove(); // Remove the original <pre> or <pre><code> block
 427
 428             const viewer = new InteractiveMermaidViewer(container, mermaidCode);
 429             mermaidViewers.push(viewer);
 430             codeBlock.dataset.mermaidViewerInitialized = 'true'; // Mark as initialized
 431         }
 432     }
 433
 434     // Initialize on DOMContentLoaded
 435     if (document.readyState === 'loading') {
 436         document.addEventListener('DOMContentLoaded', initializeMermaidViewers);
 437     } else {
 438         // DOMContentLoaded has already fired
 439         initializeMermaidViewers();
 440     }
 441
 442     // Re-center diagrams on window load, as images/fonts inside SVG might affect size
 443     window.addEventListener('load', () => {
 444         mermaidViewers.forEach(viewer => {
 445             // Delay slightly to ensure mermaid rendering is fully complete and dimensions are stable
 446             setTimeout(() => viewer.centerDiagram(), 100);
 447         });
 448     });
 449
 450     // Optional: If your CMS dynamically adds content, you might need a way to re-run initialization
 451     // For example, using a MutationObserver or a custom event.
 452     // document.addEventListener('myCMSContentLoaded', () => initializeMermaidViewers());
 453
 454 </script>
 455 <style>
 456     /* Use BookStack's CSS variables for seamless theme integration */
 457     .mermaid-container {
 458         background: var(--color-bg-alt);
 459         border: 1px solid #d0d7de;
 460         border-radius: 6px;
 461         position: relative;
 462         margin: 20px 0;
 463     }
 464
 465     .mermaid-viewport {
 466         height: 100%;
 467         /* This will now be 100% of the dynamically set container height */
 468         overflow: hidden;
 469         /* Keep this for panning/zooming when content exceeds viewport */
 470         cursor: auto;
 471         /* Default to normal system cursor */
 472     }
 473
 474     /* Ensure viewport cursor is auto when locked, even if active.
 475            The text selection (I-beam) cursor will still appear over selectable text within .mermaid-content. */
 476     .mermaid-viewport:not(.interaction-enabled):active {
 477         cursor: auto;
 478     }
 479
 480     /* Set 'grab' cursor when the viewport has the 'interactive-hover' class. */
 481     .mermaid-viewport.interactive-hover {
 482         cursor: grab;
 483     }
 484
 485     /* Set 'grabbing' cursor when the viewport has the 'interactive-pan' class. */
 486     .mermaid-viewport.interactive-pan {
 487         cursor: grabbing !important;
 488     }
 489
 490     .mermaid-content {
 491         transform-origin: 0 0;
 492         /* Allow text selection by default (when interaction is locked) */
 493         user-select: auto;
 494         /* or 'text' */
 495         will-change: transform;
 496     }
 497
 498     /* Disable text selection ONLY when interaction is enabled on the viewport */
 499     .mermaid-viewport.interaction-enabled .mermaid-content {
 500         user-select: none;
 501     }
 502
 503     /* SVG elements inherit cursor from the viewport when interaction is enabled. */
 504     .mermaid-viewport.interaction-enabled .mermaid-content svg,
 505     .mermaid-viewport.interaction-enabled .mermaid-content svg * {
 506         cursor: inherit !important;
 507         /* Force inheritance from the viewport's cursor */
 508     }
 509
 510     .mermaid-content.zooming {
 511         transition: transform 0.2s ease;
 512     }
 513
 514     .mermaid-controls {
 515         position: absolute;
 516         top: 10px;
 517         right: 10px;
 518         display: flex;
 519         gap: 5px;
 520         z-index: 10;
 521     }
 522
 523     .mermaid-viewer-button-base {
 524         border: 1px solid #d0d7de;
 525         border-radius: 6px;
 526         cursor: pointer;
 527         display: flex;
 528         align-items: center;
 529         justify-content: center;
 530         user-select: none;
 531         background: var(--color-bg);
 532         width: 32px;
 533         height: 32px;
 534         color: var(--color-text);
 535     }
 536
 537     .mermaid-viewer-button-base:hover {
 538         background: #f6f8fa;
 539     }
 540
 541     .dark-mode .mermaid-viewer-button-base:hover {
 542         background: var(--color-bg-alt);
 543     }
 544
 545     /* Override for pure white icons in dark mode */
 546     .dark-mode .mermaid-viewer-button-base {
 547         color: #fff;
 548     }
 549
 550     .mermaid-zoom-controls {
 551         position: absolute;
 552         bottom: 10px;
 553         left: 10px;
 554         display: flex;
 555         flex-direction: column;
 556         gap: 5px;
 557         z-index: 10;
 558     }
 559 </style>