Add Tailwind v4 and shadcn/ui baseline components

frontend/src/index.css

@@ -1,4 +1,130 @@
-body {
-  margin: 0;
-  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
+@import 'tailwindcss';
+@import 'tw-animate-css';
+
+@custom-variant dark (&:where(.dark, .dark *));
+
+@theme {
+  --color-border: hsl(var(--border));
+  --color-input: hsl(var(--input));
+  --color-ring: hsl(var(--ring));
+  --color-background: hsl(var(--background));
+  --color-foreground: hsl(var(--foreground));
+  --color-primary: hsl(var(--primary));
+  --color-primary-foreground: hsl(var(--primary-foreground));
+  --color-secondary: hsl(var(--secondary));
+  --color-secondary-foreground: hsl(var(--secondary-foreground));
+  --color-destructive: hsl(var(--destructive));
+  --color-destructive-foreground: hsl(var(--destructive-foreground));
+  --color-muted: hsl(var(--muted));
+  --color-muted-foreground: hsl(var(--muted-foreground));
+  --color-accent: hsl(var(--accent));
+  --color-accent-foreground: hsl(var(--accent-foreground));
+  --color-popover: hsl(var(--popover));
+  --color-popover-foreground: hsl(var(--popover-foreground));
+  --color-card: hsl(var(--card));
+  --color-card-foreground: hsl(var(--card-foreground));
+  --radius-lg: var(--radius);
+  --radius-md: calc(var(--radius) - 2px);
+  --radius-sm: calc(var(--radius) - 4px);
+}
+
+:root {
+  --background: 0 0% 100%;
+  --foreground: 222.2 84% 4.9%;
+  --card: 0 0% 100%;
+  --card-foreground: 222.2 84% 4.9%;
+  --popover: 0 0% 100%;
+  --popover-foreground: 222.2 84% 4.9%;
+  --primary: 222.2 47.4% 11.2%;
+  --primary-foreground: 210 40% 98%;
+  --secondary: 210 40% 96.1%;
+  --secondary-foreground: 222.2 47.4% 11.2%;
+  --muted: 210 40% 96.1%;
+  --muted-foreground: 215.4 16.3% 46.9%;
+  --accent: 210 40% 96.1%;
+  --accent-foreground: 222.2 47.4% 11.2%;
+  --destructive: 0 84.2% 60.2%;
+  --destructive-foreground: 210 40% 98%;
+  --border: 214.3 31.8% 91.4%;
+  --input: 214.3 31.8% 91.4%;
+  --ring: 222.2 84% 4.9%;
+  --radius: 0.5rem;
+}
+
+.dark {
+  --background: 222.2 84% 4.9%;
+  --foreground: 210 40% 98%;
+  --card: 222.2 84% 4.9%;
+  --card-foreground: 210 40% 98%;
+  --popover: 222.2 84% 4.9%;
+  --popover-foreground: 210 40% 98%;
+  --primary: 210 40% 98%;
+  --primary-foreground: 222.2 47.4% 11.2%;
+  --secondary: 217.2 32.6% 17.5%;
+  --secondary-foreground: 210 40% 98%;
+  --muted: 217.2 32.6% 17.5%;
+  --muted-foreground: 215 20.2% 65.1%;
+  --accent: 217.2 32.6% 17.5%;
+  --accent-foreground: 210 40% 98%;
+  --destructive: 0 62.8% 30.6%;
+  --destructive-foreground: 210 40% 98%;
+  --border: 217.2 32.6% 17.5%;
+  --input: 217.2 32.6% 17.5%;
+  --ring: 212.7 26.8% 83.9%;
+}
+
+@layer base {
+  * {
+    @apply border-border;
+  }
+  body {
+    @apply bg-background text-foreground;
+    margin: 0;
+    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
+  }
+}
+
+@layer components {
+  .prose-cms {
+    @apply text-foreground leading-relaxed;
+  }
+  .prose-cms h1,
+  .prose-cms h2,
+  .prose-cms h3,
+  .prose-cms h4,
+  .prose-cms h5,
+  .prose-cms h6 {
+    @apply font-bold mt-6 mb-1;
+  }
+  .prose-cms h1 {
+    @apply text-3xl;
+  }
+  .prose-cms h2 {
+    @apply text-2xl;
+  }
+  .prose-cms h3 {
+    @apply text-xl;
+  }
+  .prose-cms h4,
+  .prose-cms h5 {
+    @apply text-lg;
+  }
+  .prose-cms p {
+    @apply my-3;
+  }
+  .prose-cms ul {
+    @apply list-disc ml-8 my-3;
+  }
+  .prose-cms ol {
+    @apply list-decimal ml-8 my-3;
+  }
+  .prose-cms a {
+    @apply text-primary underline underline-offset-4;
+  }
+  .prose-cms img {
+    @apply rounded-md my-4;
+  }
+  .prose-cms blockquote {
+    @apply border-l-4 border-muted-foreground pl-4 italic my-3;
+  }
 }