feat: Create optimized pixel sand simulation with chunking system

styles.css

@@ -0,0 +1,61 @@
+* {
+    margin: 0;
+    padding: 0;
+    box-sizing: border-box;
+}
+
+body {
+    font-family: Arial, sans-serif;
+    background-color: #222;
+    color: #fff;
+    overflow: hidden;
+    height: 100vh;
+}
+
+.container {
+    display: flex;
+    flex-direction: column;
+    height: 100vh;
+}
+
+.controls {
+    display: flex;
+    justify-content: space-between;
+    padding: 10px;
+    background-color: #333;
+}
+
+.tools button, .navigation button {
+    background-color: #555;
+    color: white;
+    border: none;
+    padding: 8px 12px;
+    margin: 0 5px;
+    cursor: pointer;
+    border-radius: 4px;
+}
+
+.tools button.active {
+    background-color: #ff9800;
+}
+
+.navigation {
+    display: flex;
+}
+
+.info {
+    display: flex;
+    flex-direction: column;
+    justify-content: center;
+}
+
+.info span {
+    margin: 2px 0;
+    font-size: 14px;
+}
+
+#simulation-canvas {
+    flex-grow: 1;
+    background-color: #000;
+    cursor: crosshair;
+}