feat: Add initial frontend dependencies, base CSS, and Gitea Docker build workflow.

frontend/src/index.css

@@ -0,0 +1,45 @@
+:root {
+  --bg-color: #0f172a;
+  --panel-bg: rgba(30, 41, 59, 0.7);
+  --text-main: #f8fafc;
+  --text-muted: #94a3b8;
+  --accent-primary: #8b5cf6;
+  --accent-secondary: #ec4899;
+  --success: #10b981;
+  --danger: #ef4444;
+  --border-color: rgba(255, 255, 255, 0.1);
+  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
+  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
+}
+
+* {
+  box-sizing: border-box;
+  margin: 0;
+  padding: 0;
+}
+
+body {
+  font-family: var(--font-family);
+  background-color: var(--bg-color);
+  background-image: radial-gradient(circle at top right, rgba(139, 92, 246, 0.15), transparent 40%),
+                    radial-gradient(circle at bottom left, rgba(236, 72, 153, 0.15), transparent 40%);
+  color: var(--text-main);
+  min-height: 100vh;
+  display: flex;
+  justify-content: center;
+  align-items: flex-start;
+  padding: 4rem 1rem;
+}
+
+button {
+  cursor: pointer;
+  font-family: inherit;
+  border: none;
+  outline: none;
+  transition: all 0.3s ease;
+}
+
+input {
+  font-family: inherit;
+  outline: none;
+}