diff --git a/src/components/Header.svelte b/src/components/Header.svelte
index beeb60a..26c92a6 100644
--- a/src/components/Header.svelte
+++ b/src/components/Header.svelte
@@ -1,12 +1,11 @@
 <script>
+    import { page } from '$app/stores';
     export let y;
 
-    // export let tabs = [
-    //     { name: "Projects ", link: "#projects" },
-    //     { name: "About", link: "#about" },
-    //     { name: "Mission", link: "#mission"},
-    //     { name: "The Team", link: "#team"},
-    // ];
+    const tabs = [
+        { name: "Home", link: "/" },
+        { name: "Erminia", link: "/erminia" },
+    ];
 </script>
 
 <header
@@ -15,34 +14,20 @@
             ? " py-4 bg-slate-950 border-green-950"
             : " py-6 bg-transparent border-transparent")}
 >
-    <h1 class="font-medium">
- <span class="">Vertical</span> <b class="font-bold poppins text-green-400">Playground</b>
- </h1>
-    <!-- <div class="sm:flex items-center gap-4 hidden">
-        {#each tabs as tab, index}
+    <a href="/" class="font-medium hover:opacity-80 duration-200">
+        <span class="">Vertical</span> <b class="font-bold poppins text-green-400">Playground</b>
+    </a>
+    <nav class="flex items-center gap-1">
+        {#each tabs as tab}
             <a
                 href={tab.link}
-                class="duration-200 hover:text-green-400"
-                target={index === 2 ? "_blank" : ""}
+                class={"px-3 py-1.5 rounded-lg text-sm duration-200 " +
+                    ($page.url.pathname === tab.link
+                        ? "text-green-400 bg-green-400/10"
+                        : "text-slate-300 hover:text-green-400 hover:bg-slate-800")}
             >
-                <p>{tab.name}</p>
+                {tab.name}
             </a>
         {/each}
-        <button
-            class="blueShadow relative overflow-hidden px-5 py-2 group rounded-full bg-green-600 text-white"
-        >
-            <div
-                class="absolute top-0 right-full w-full h-full bg-green-400 group-hover:translate-x-full z-0 duration-200"
-            />
-            <h4 class="relative z-9">Login</h4>
-        </button>
-        <button
-            class="blueShadow relative overflow-hidden px-5 py-2 group rounded-full bg-white text-slate-950"
-        >
-            <div
-                class="absolute top-0 right-full w-full h-full bg-green-400 group-hover:translate-x-full z-0 duration-200"
-            />
-            <h4 class="relative z-9">Get in touch</h4>
-        </button>
-    </div> -->
+    </nav>
 </header>
diff --git a/src/routes/+layout.svelte b/src/routes/+layout.svelte
index 207ef23..03627b0 100644
--- a/src/routes/+layout.svelte
+++ b/src/routes/+layout.svelte
@@ -30,7 +30,9 @@
         </button>
     </div>
     <Header {y} {innerHeight}/>
-    <slot />
+    <main class="flex flex-col flex-1 min-h-0">
+        <slot />
+    </main>
     <Footer />
 </div>
 <svelte:window bind:scrollY={y} bind:innerHeight bind:innerWidth />
diff --git a/src/routes/erminia/+page.svelte b/src/routes/erminia/+page.svelte
new file mode 100644
index 0000000..85c2cf1
--- /dev/null
+++ b/src/routes/erminia/+page.svelte
@@ -0,0 +1,251 @@
+<script>
+    let swapped = $state(false);
+    let code = $state(`# Erminia DSL — ARC-AGI Grid Language
+# Define a grid with dimensions
+grid 5 5
+
+# Set individual cells: cell(row, col) = color_index
+cell(0,0) = 1
+cell(0,4) = 1
+cell(1,1) = 2
+cell(1,3) = 2
+cell(2,2) = 3
+cell(3,1) = 2
+cell(3,3) = 2
+cell(4,0) = 1
+cell(4,4) = 1
+
+# Define a named pattern
+pattern diamond {
+  cell(0,2) = 4
+  cell(1,2) = 4
+  cell(2,0) = 4
+  cell(2,4) = 4
+  cell(3,2) = 4
+  cell(4,2) = 4
+}
+
+apply diamond
+`);
+
+    const COLORS = [
+        '#1e293b', // 0 - background (slate-800)
+        '#4ade80', // 1 - green
+        '#60a5fa', // 2 - blue
+        '#f87171', // 3 - red
+        '#facc15', // 4 - yellow
+        '#c084fc', // 5 - purple
+        '#fb923c', // 6 - orange
+        '#34d399', // 7 - emerald
+        '#f472b6', // 8 - pink
+        '#94a3b8', // 9 - slate
+    ];
+
+    const parsed = $derived(parseErminia(code));
+    const jsonOutput = $derived(JSON.stringify(parsed, null, 2));
+
+    function parseErminia(src) {
+        const lines = src.split('\n').map(l => l.trim()).filter(l => l && !l.startsWith('#'));
+        let rows = 0, cols = 0;
+        /** @type {Record<string, number>} */
+        let cells = {};
+        /** @type {Record<string, Record<string, number>>} */
+        let patterns = {};
+        /** @type {string | null} */
+        let currentPattern = null;
+
+        for (const line of lines) {
+            // grid N M
+            const gridMatch = line.match(/^grid\s+(\d+)\s+(\d+)$/);
+            if (gridMatch) {
+                rows = parseInt(gridMatch[1]);
+                cols = parseInt(gridMatch[2]);
+                continue;
+            }
+
+            // pattern name {
+            const patternStart = line.match(/^pattern\s+(\w+)\s*\{$/);
+            if (patternStart) {
+                currentPattern = patternStart[1];
+                patterns[currentPattern] = {};
+                continue;
+            }
+
+            // closing brace
+            if (line === '}') {
+                currentPattern = null;
+                continue;
+            }
+
+            // cell(r,c) = v
+            const cellMatch = line.match(/^cell\((\d+),(\d+)\)\s*=\s*(\d+)$/);
+            if (cellMatch) {
+                const r = parseInt(cellMatch[1]);
+                const c = parseInt(cellMatch[2]);
+                const v = parseInt(cellMatch[3]);
+                const key = `${r},${c}`;
+                if (currentPattern) {
+                    patterns[currentPattern][key] = v;
+                } else {
+                    cells[key] = v;
+                }
+                continue;
+            }
+
+            // apply patternName
+            const applyMatch = line.match(/^apply\s+(\w+)$/);
+            if (applyMatch) {
+                const name = applyMatch[1];
+                if (patterns[name]) {
+                    Object.assign(cells, patterns[name]);
+                }
+                continue;
+            }
+        }
+
+        // Build grid array
+        const grid = [];
+        for (let r = 0; r < rows; r++) {
+            const row = [];
+            for (let c = 0; c < cols; c++) {
+                row.push(cells[`${r},${c}`] ?? 0);
+            }
+            grid.push(row);
+        }
+
+        return { rows, cols, grid, patterns: Object.keys(patterns) };
+    }
+
+    /** @type {HTMLTextAreaElement} */
+    let editorEl;
+    let lineCount = $derived(code.split('\n').length);
+
+    /** @param {KeyboardEvent & { target: HTMLTextAreaElement }} e */
+    function handleTab(e) {
+        if (e.key === 'Tab') {
+            e.preventDefault();
+            const start = e.target.selectionStart;
+            const end = e.target.selectionEnd;
+            code = code.substring(0, start) + '  ' + code.substring(end);
+            // restore cursor after state update
+            requestAnimationFrame(() => {
+                if (editorEl) {
+                    editorEl.selectionStart = editorEl.selectionEnd = start + 2;
+                }
+            });
+        }
+    }
+
+    let copied = $state(false);
+    function copyJson() {
+        navigator.clipboard.writeText(jsonOutput);
+        copied = true;
+        setTimeout(() => copied = false, 1500);
+    }
+</script>
+
+<div class="flex flex-col flex-1 min-h-0 px-4 pb-6 pt-2 gap-4">
+    <!-- Toolbar -->
+    <div class="flex items-center justify-between gap-4 flex-wrap">
+        <div>
+            <h2 class="poppins font-bold text-green-400 text-lg">Erminia <span class="font-normal text-white">Playground</span></h2>
+            <p class="text-slate-400 text-xs mt-0.5">DSL for ARC-AGI abstracted image interpretation</p>
+        </div>
+        <div class="flex items-center gap-2">
+            <span class="text-slate-500 text-xs hidden sm:block">
+                {parsed.rows}×{parsed.cols} grid · {parsed.patterns.length} pattern{parsed.patterns.length === 1 ? '' : 's'}
+            </span>
+            <div class="w-px h-4 bg-slate-700 hidden sm:block"></div>
+            <button
+                onclick={() => swapped = !swapped}
+                class="flex items-center gap-2 px-3 py-1.5 rounded-lg border border-slate-700 hover:border-green-700 hover:text-green-400 text-slate-300 duration-200 text-xs cursor-pointer"
+                title="Swap editor and renderer"
+            >
+                <i class="fa-solid fa-arrow-right-arrow-left"></i>
+                <span class="hidden sm:inline">Swap Panels</span>
+            </button>
+        </div>
+    </div>
+
+    <!-- Panels -->
+    <div class="flex gap-4 flex-1 min-h-0" class:flex-row-reverse={swapped}>
+        <!-- Editor Panel -->
+        <div class="flex flex-col flex-1 min-w-0 rounded-xl border border-slate-700 overflow-hidden bg-slate-900/60">
+            <div class="flex items-center justify-between px-4 py-2 border-b border-slate-700 bg-slate-900/80">
+                <div class="flex items-center gap-2 text-xs text-slate-400">
+                    <i class="fa-solid fa-code text-green-400"></i>
+                    <span>Editor</span>
+                    <span class="text-slate-600">·</span>
+                    <span>{lineCount} lines</span>
+                </div>
+                <div class="flex gap-1.5">
+                    <span class="w-2.5 h-2.5 rounded-full bg-slate-700"></span>
+                    <span class="w-2.5 h-2.5 rounded-full bg-slate-700"></span>
+                    <span class="w-2.5 h-2.5 rounded-full bg-green-700"></span>
+                </div>
+            </div>
+            <div class="flex flex-1 min-h-0 overflow-hidden font-mono text-sm">
+                <!-- Line numbers -->
+                <div class="select-none text-right pr-3 pl-3 pt-4 text-slate-600 text-xs leading-6 overflow-hidden bg-slate-900/40 border-r border-slate-800 min-w-[3rem]">
+                    {#each Array(lineCount) as _, i}
+                        <div>{i + 1}</div>
+                    {/each}
+                </div>
+                <!-- Textarea -->
+                <textarea
+                    bind:this={editorEl}
+                    bind:value={code}
+                    onkeydown={handleTab}
+                    spellcheck={false}
+                    class="flex-1 bg-transparent text-slate-200 resize-none outline-none p-4 leading-6 overflow-auto"
+                    style="tab-size: 2;"
+                    placeholder="Write Erminia code here..."
+                ></textarea>
+            </div>
+        </div>
+
+        <!-- Renderer Panel -->
+        <div class="flex flex-col flex-1 min-w-0 rounded-xl border border-slate-700 overflow-hidden bg-slate-900/60">
+            <div class="flex items-center justify-between px-4 py-2 border-b border-slate-700 bg-slate-900/80">
+                <div class="flex items-center gap-2 text-xs text-slate-400">
+                    <i class="fa-solid fa-diagram-project text-green-400"></i>
+                    <span>Renderer</span>
+                </div>
+                <button
+                    onclick={copyJson}
+                    class="flex items-center gap-1.5 text-xs text-slate-500 hover:text-green-400 duration-200 cursor-pointer"
+                    title="Copy JSON"
+                >
+                    <i class="fa-solid {copied ? 'fa-check text-green-400' : 'fa-copy'}"></i>
+                    <span>{copied ? 'Copied!' : 'Copy JSON'}</span>
+                </button>
+            </div>
+
+            <div class="flex flex-col flex-1 min-h-0 overflow-hidden">
+                <!-- Visual grid -->
+                {#if parsed.rows > 0 && parsed.cols > 0}
+                    <div class="p-4 border-b border-slate-800 flex justify-center bg-slate-950/40">
+                        <div class="flex flex-col gap-0.5">
+                            {#each parsed.grid as row}
+                                <div class="flex gap-0.5">
+                                    {#each row as cell}
+                                        <div
+                                            class="w-7 h-7 rounded-sm transition-colors duration-150"
+                                            style="background-color: {COLORS[cell] ?? COLORS[0]}"
+                                            title="value: {cell}"
+                                        ></div>
+                                    {/each}
+                                </div>
+                            {/each}
+                        </div>
+                    </div>
+                {/if}
+
+                <!-- JSON output -->
+                <div class="flex-1 overflow-auto p-4 font-mono text-xs text-slate-300 leading-5">
+                    <pre class="whitespace-pre-wrap break-all">{jsonOutput}</pre>
+                </div>
+            </div>
+        </div>
+    </div>
+</div>