init - PoC works
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205
index.html
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205
index.html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Simple Mermaid Editor</title>
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<script src="https://cdn.jsdelivr.net/npm/mermaid@11/dist/mermaid.min.js"></script>
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<style>
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*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
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body {
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font-family: system-ui, sans-serif;
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background: #0f1117;
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color: #e0e0e0;
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height: 100vh;
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display: flex;
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flex-direction: column;
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}
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header {
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padding: 12px 20px;
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border-bottom: 1px solid #2a2d3a;
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display: flex;
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align-items: center;
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gap: 12px;
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flex-shrink: 0;
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}
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header h1 { font-size: 1.1rem; font-weight: 600; color: #fff; }
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.badge {
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font-size: 0.7rem;
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background: #1e3a5f;
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color: #60a5fa;
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padding: 2px 8px;
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border-radius: 999px;
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}
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.main { display: flex; flex: 1; overflow: hidden; }
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.editor-pane {
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display: flex;
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flex-direction: column;
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width: 40%;
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border-right: 1px solid #2a2d3a;
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}
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.pane-label {
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font-size: 0.7rem;
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font-weight: 600;
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letter-spacing: 0.08em;
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text-transform: uppercase;
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color: #666;
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padding: 8px 16px;
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border-bottom: 1px solid #2a2d3a;
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flex-shrink: 0;
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display: flex;
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align-items: center;
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}
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textarea {
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flex: 1;
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background: #0f1117;
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color: #c9d1d9;
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border: none;
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outline: none;
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resize: none;
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padding: 16px;
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font-family: "JetBrains Mono", "Fira Code", "Courier New", monospace;
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font-size: 0.85rem;
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line-height: 1.6;
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tab-size: 2;
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}
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.toolbar {
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border-top: 1px solid #2a2d3a;
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padding: 8px 12px;
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display: flex;
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align-items: center;
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gap: 8px;
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flex-shrink: 0;
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flex-wrap: wrap;
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}
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.toolbar span { font-size: 0.75rem; color: #555; margin-left: auto; }
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button {
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padding: 5px 14px;
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border-radius: 6px;
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border: none;
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cursor: pointer;
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font-size: 0.8rem;
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font-weight: 500;
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transition: opacity 0.15s;
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}
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button:hover { opacity: 0.85; }
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.btn-render { background: #2563eb; color: #fff; }
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.btn-muted { background: #2a2d3a; color: #aaa; }
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.btn-sm { padding: 2px 10px; font-size: 0.7rem; margin-left: auto; }
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/* ── Preview ── */
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.preview-pane { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
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.preview-area {
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flex: 1;
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overflow: hidden;
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position: relative;
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cursor: grab;
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}
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.preview-area.dragging { cursor: grabbing; }
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#pan-layer {
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position: absolute;
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top: 0; left: 0;
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transform-origin: 0 0;
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}
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#svg-frame {
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display: block;
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border: none;
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background: transparent;
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}
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/* Placeholder / error overlay — centred, outside the pan layer */
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#overlay {
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position: absolute;
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inset: 0;
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display: flex;
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align-items: center;
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justify-content: center;
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pointer-events: none;
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}
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.placeholder {
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color: #333;
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font-size: 0.9rem;
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text-align: center;
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pointer-events: none;
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}
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.placeholder p { margin-top: 6px; font-size: 0.78rem; color: #2a2d3a; }
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.error {
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background: #2d1b1b;
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border: 1px solid #5c2626;
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border-radius: 8px;
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padding: 12px 16px;
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color: #f87171;
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font-family: monospace;
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font-size: 0.8rem;
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white-space: pre-wrap;
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max-width: 560px;
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opacity: 1;
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transition: opacity 0.6s ease;
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pointer-events: none;
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}
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.error.fade-out { opacity: 0; }
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</style>
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</head>
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<body>
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<header>
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<h1>Simple Mermaid Editor</h1>
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<span class="badge">live preview</span>
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</header>
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<div class="main">
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<div class="editor-pane">
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<div class="pane-label">Diagram Source</div>
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<textarea id="editor" spellcheck="false" placeholder="Type your Mermaid diagram here…"></textarea>
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<div class="toolbar">
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<button class="btn-render" onclick="render()">Render</button>
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<button class="btn-muted" onclick="clearEditor()">Clear</button>
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<button class="btn-muted" onclick="copySvg()">Copy SVG</button>
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<button class="btn-muted" onclick="downloadSvg()">Download SVG</button>
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<span id="status"></span>
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</div>
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</div>
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<div class="preview-pane">
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<div class="pane-label">
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Preview
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<button class="btn-muted btn-sm" onclick="resetView()">Reset view</button>
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</div>
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<div class="preview-area" id="previewArea">
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<div id="pan-layer">
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<iframe id="svg-frame" sandbox="" scrolling="no"></iframe>
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</div>
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<div id="overlay">
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<div class="placeholder" id="placeholder">
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← Write a diagram and click Render
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<p>or press Ctrl+Enter</p>
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</div>
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</div>
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</div>
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</div>
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</div>
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<script src="app.js"></script>
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</body>
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</html>
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