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