feat: initial implementation of Light Chat app with React, Capacitor, and comprehensive tests

src/index.css

@@ -0,0 +1,66 @@
+:root {
+  --bg-primary: #0a0a0a;
+  --bg-secondary: #1a1a1a;
+  --bg-tertiary: #2a2a2a;
+  --text-primary: #ffffff;
+  --text-secondary: #b0b0b0;
+  --accent: #3b82f6;
+  --accent-hover: #2563eb;
+  --border: #333333;
+  --success: #10b981;
+  --error: #ef4444;
+}
+
+* {
+  margin: 0;
+  padding: 0;
+  box-sizing: border-box;
+}
+
+body {
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
+  background-color: var(--bg-primary);
+  color: var(--text-primary);
+  line-height: 1.5;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+#root {
+  min-height: 100vh;
+  width: 100%;
+}
+
+button {
+  background: var(--accent);
+  color: white;
+  border: none;
+  padding: 8px 16px;
+  border-radius: 4px;
+  cursor: pointer;
+  font-size: 14px;
+}
+
+button:hover {
+  background: var(--accent-hover);
+}
+
+button:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+}
+
+input, textarea {
+  background: var(--bg-secondary);
+  border: 1px solid var(--border);
+  color: var(--text-primary);
+  padding: 8px 12px;
+  border-radius: 4px;
+  font-size: 14px;
+  width: 100%;
+}
+
+input:focus, textarea:focus {
+  outline: none;
+  border-color: var(--accent);
+}