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+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8" />
+  <title>Mini Web Playground</title>
+  <meta name="viewport" content="width=device-width, initial-scale=1" />
+  <style>
+    :root {
+      --bg: #050812;
+      --panel: #0c101c;
+      --accent: #ff9f43;
+      --border: #222a3b;
+      --text: #e6ecff;
+      --muted: #8f9bb8;
+    }
+
+    * {
+      box-sizing: border-box;
+    }
+
+    body {
+      margin: 0;
+      height: 100vh;
+      display: flex;
+      flex-direction: column;
+      background: radial-gradient(circle at top, #10172a, #050812);
+      color: var(--text);
+      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
+    }
+
+    header {
+      padding: 0.75rem 1.25rem;
+      border-bottom: 1px solid var(--border);
+      display: flex;
+      align-items: center;
+      justify-content: space-between;
+      background: linear-gradient(90deg, #0b1020, #11172b);
+    }
+
+    header h1 {
+      margin: 0;
+      font-size: 1rem;
+      letter-spacing: 0.08em;
+      text-transform: uppercase;
+      color: var(--muted);
+    }
+
+    header .actions {
+      display: flex;
+      gap: 0.5rem;
+      align-items: center;
+    }
+
+    button {
+      border: none;
+      border-radius: 999px;
+      padding: 0.4rem 0.9rem;
+      font-size: 0.85rem;
+      font-weight: 600;
+      letter-spacing: 0.05em;
+      text-transform: uppercase;
+      cursor: pointer;
+      background: var(--accent);
+      color: #1b1520;
+      box-shadow: 0 0 0 1px rgba(0,0,0,0.5), 0 6px 18px rgba(0,0,0,0.45);
+      transition: transform 0.08s ease, box-shadow 0.08s ease, background 0.15s ease;
+    }
+
+    button:hover {
+      transform: translateY(-1px);
+      box-shadow: 0 10px 24px rgba(0,0,0,0.6);
+      background: #ffb356;
+    }
+
+    button:active {
+      transform: translateY(0);
+      box-shadow: 0 4px 12px rgba(0,0,0,0.5);
+    }
+
+    main {
+      flex: 1;
+      display: flex;
+      min-height: 0;
+    }
+
+    .pane {
+      flex: 1;
+      min-width: 0;
+      display: flex;
+      flex-direction: column;
+      border-left: 1px solid var(--border);
+    }
+
+    .pane:first-child {
+      border-left: none;
+    }
+
+    .pane-header {
+      padding: 0.5rem 0.75rem;
+      border-bottom: 1px solid var(--border);
+      font-size: 0.75rem;
+      text-transform: uppercase;
+      letter-spacing: 0.1em;
+      color: var(--muted);
+      background: rgba(0,0,0,0.35);
+      display: flex;
+      align-items: center;
+      justify-content: space-between;
+    }
+
+    .editors {
+      display: grid;
+      grid-template-rows: auto auto auto;
+      gap: 0;
+      flex: 1;
+      min-height: 0;
+      background: radial-gradient(circle at top left, #161b31, #050812);
+    }
+
+    .editor-block {
+      display: flex;
+      flex-direction: column;
+      min-height: 0;
+      border-bottom: 1px solid var(--border);
+    }
+
+    .editor-block:last-child {
+      border-bottom: none;
+    }
+
+    .editor-label {
+      padding: 0.35rem 0.75rem;
+      font-size: 0.7rem;
+      text-transform: uppercase;
+      letter-spacing: 0.12em;
+      color: var(--muted);
+      background: rgba(5, 8, 18, 0.92);
+      border-bottom: 1px solid rgba(255,255,255,0.03);
+    }
+
+    textarea {
+      flex: 1;
+      min-height: 0;
+      width: 100%;
+      resize: none;
+      border: none;
+      padding: 0.5rem 0.75rem;
+      background: rgba(3, 6, 17, 0.9);
+      color: var(--text);
+      font-family: "JetBrains Mono", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
+      font-size: 0.85rem;
+      line-height: 1.4;
+      border-radius: 0;
+      outline: none;
+    }
+
+    textarea:focus {
+      box-shadow: inset 0 0 0 1px rgba(255, 159, 67, 0.6);
+      background: rgba(7, 10, 24, 0.95);
+    }
+
+    iframe {
+      flex: 1;
+      border: none;
+      background: white;
+    }
+
+    .hint {
+      font-size: 0.75rem;
+      color: var(--muted);
+    }
+
+    @media (max-width: 900px) {
+      main {
+        flex-direction: column;
+      }
+      .pane {
+        height: 50%;
+      }
+    }
+  </style>
+</head>
+<body>
+  <header>
+    <h1>Web Code Playground</h1>
+    <div class="actions">
+      <span class="hint">Edit HTML, CSS, JS → click Run</span>
+      <button id="runBtn">Run ▶</button>
+    </div>
+  </header>
+
+  <main>
+    <!-- Left: editors -->
+    <section class="pane">
+      <div class="pane-header">
+        <span>Code</span>
+      </div>
+      <div class="editors">
+        <div class="editor-block">
+          <div class="editor-label">HTML</div>
+          <textarea id="htmlCode" spellcheck="false">
+<h1>Hello, Web Playground!</h1>
+<p>Edit the HTML, CSS, and JS, then hit <strong>Run</strong>.</p>
+<button id="clickMe">Click me</button>
+<div id="output"></div>
+          </textarea>
+        </div>
+        <div class="editor-block">
+          <div class="editor-label">CSS</div>
+          <textarea id="cssCode" spellcheck="false">
+body {
+  font-family: system-ui, sans-serif;
+  padding: 2rem;
+  background: radial-gradient(circle at top, #1f2937, #020617);
+  color: #e5e7eb;
+}
+
+h1 {
+  color: #fbbf24;
+}
+
+button {
+  padding: 0.4rem 0.8rem;
+  border-radius: 6px;
+  border: none;
+  background: #22c55e;
+  color: #022c22;
+  font-weight: 600;
+  cursor: pointer;
+}
+
+button:hover {
+  background: #4ade80;
+}
+          </textarea>
+        </div>
+        <div class="editor-block">
+          <div class="editor-label">JavaScript</div>
+          <textarea id="jsCode" spellcheck="false">
+document.getElementById("clickMe").addEventListener("click", () => {
+  const out = document.getElementById("output");
+  out.textContent = "Button clicked at " + new Date().toLocaleTimeString();
+});
+          </textarea>
+        </div>
+      </div>
+    </section>
+
+    <!-- Right: preview -->
+    <section class="pane">
+      <div class="pane-header">
+        <span>Preview</span>
+      </div>
+      <iframe id="preview"></iframe>
+    </section>
+  </main>
+
+  <script>
+    function runCode() {
+      const html = document.getElementById("htmlCode").value;
+      const css = document.getElementById("cssCode").value;
+      const js = document.getElementById("jsCode").value;
+
+      const iframe = document.getElementById("preview");
+      const doc = iframe.contentDocument || iframe.contentWindow.document;
+
+      const fullDoc = `
+<!doctype html>
+<html>
+<head>
+<meta charset="utf-8">
+<style>
+${css}
+</style>
+</head>
+<body>
+${html}
+<script>
+${js.replace(/<\/script>/gi, "<\\/script>")}
+<\/script>
+</body>
+</html>`;
+
+      doc.open();
+      doc.write(fullDoc);
+      doc.close();
+    }
+
+    // Run once on load
+    window.addEventListener("load", runCode);
+    // Hook up button
+    document.getElementById("runBtn").addEventListener("click", runCode);
+  </script>
+</body>
+</html>
